package api

import (
	"containr/internal/database"
	"containr/internal/database/sqlcdb"
	"context"
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"database/sql"
	"encoding/hex"
	"encoding/json"
	"encoding/pem"
	"errors"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
	"github.com/google/uuid"
)

// GitProvider represents a Git provider configuration per user.
type GitProvider struct {
	ID          string    `json:"id" db:"id"`
	Name        string    `json:"name" db:"name"` // github, gitlab, bitbucket, gitea, github_app
	DisplayName string    `json:"display_name" db:"display_name"`
	APIUrl      string    `json:"api_url" db:"api_url"`
	WebhookUrl  string    `json:"webhook_url" db:"webhook_url"`
	UserID      string    `json:"user_id" db:"user_id"`
	AccessToken string    `json:"-" db:"access_token"` // Hidden in JSON responses
	CreatedAt   time.Time `json:"created_at" db:"created_at"`
	UpdatedAt   time.Time `json:"updated_at" db:"updated_at"`
}

// GitRepository represents a connected Git repository
type GitRepository struct {
	ID            string    `json:"id" db:"id"`
	ProviderID    string    `json:"provider_id" db:"provider_id"`
	Name          string    `json:"name" db:"name"`
	FullName      string    `json:"full_name" db:"full_name"`
	Description   string    `json:"description" db:"description"`
	CloneURL      string    `json:"clone_url" db:"clone_url"`
	WebhookURL    string    `json:"webhook_url" db:"webhook_url"`
	DefaultBranch string    `json:"default_branch" db:"default_branch"`
	IsPrivate     bool      `json:"is_private" db:"is_private"`
	UserID        string    `json:"user_id" db:"user_id"`
	CreatedAt     time.Time `json:"created_at" db:"created_at"`
	UpdatedAt     time.Time `json:"updated_at" db:"updated_at"`
}

// GitWebhook represents a webhook configuration
type GitWebhook struct {
	ID         string    `json:"id" db:"id"`
	RepoID     string    `json:"repo_id" db:"repo_id"`
	ProviderID string    `json:"provider_id" db:"provider_id"`
	Events     string    `json:"events" db:"events"`    // JSON array of events
	Secret     string    `json:"-" db:"webhook_secret"` // Hidden in JSON responses
	Active     bool      `json:"active" db:"active"`
	CreatedAt  time.Time `json:"created_at" db:"created_at"`
	UpdatedAt  time.Time `json:"updated_at" db:"updated_at"`
}

// CreateGitProviderRequest represents a request to create a Git provider
type CreateGitProviderRequest struct {
	Name        string `json:"name" binding:"required,oneof=github gitlab bitbucket gitea github_app"`
	DisplayName string `json:"display_name" binding:"required"`
	AccessToken string `json:"access_token" binding:"required"`
	APIUrl      string `json:"api_url,omitempty"`
}

type ConnectGitHubAppRequest struct {
	InstallationID int64  `json:"installation_id" binding:"required,gt=0"`
	DisplayName    string `json:"display_name,omitempty"`
}

// CreateGitRepoRequest represents a request to connect a Git repository
type CreateGitRepoRequest struct {
	ProviderID   string `json:"provider_id" binding:"required"`
	RepoFullName string `json:"repo_full_name" binding:"required"`
}

// CreateWebhookRequest represents a request to create a webhook
type CreateWebhookRequest struct {
	RepoID string   `json:"repo_id" binding:"required"`
	Events []string `json:"events" binding:"required"`
	Branch string   `json:"branch"`
}

func gitRepoFrom(r sqlcdb.ListGitRepositoriesRow) GitRepository {
	return GitRepository{
		ID:            r.ID.String(),
		ProviderID:    r.ProviderID.String(),
		Name:          r.Name,
		FullName:      r.FullName,
		Description:   r.Description,
		CloneURL:      r.CloneUrl,
		WebhookURL:    r.WebhookUrl,
		DefaultBranch: r.DefaultBranch.String,
		IsPrivate:     r.IsPrivate.Bool,
		UserID:        r.UserID.String(),
		CreatedAt:     r.CreatedAt.Time,
		UpdatedAt:     r.UpdatedAt.Time,
	}
}

func gitRepoFromFullNameRow(r sqlcdb.GetGitRepositoryByFullNameRow) GitRepository {
	return GitRepository{
		ID:            r.ID.String(),
		ProviderID:    r.ProviderID.String(),
		Name:          r.Name,
		FullName:      r.FullName,
		Description:   r.Description,
		CloneURL:      r.CloneUrl,
		WebhookURL:    r.WebhookUrl,
		DefaultBranch: r.DefaultBranch.String,
		IsPrivate:     r.IsPrivate.Bool,
		UserID:        r.UserID.String(),
		CreatedAt:     r.CreatedAt.Time,
		UpdatedAt:     r.UpdatedAt.Time,
	}
}

func gitProviderFrom(p sqlcdb.ListGitProvidersRow) GitProvider {
	return GitProvider{
		ID:          p.ID.String(),
		Name:        p.Name,
		DisplayName: p.DisplayName,
		APIUrl:      p.ApiUrl,
		WebhookUrl:  p.WebhookUrl,
		UserID:      p.UserID.String(),
		CreatedAt:   p.CreatedAt.Time,
		UpdatedAt:   p.UpdatedAt.Time,
	}
}

func handleGetGitProviders(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	userID, err := uuid.Parse(ctx.userID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}
	rows, err := sqlcdb.New(ctx.db.DB).ListGitProviders(context.Background(), userID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}

	providers := make([]GitProvider, 0, len(rows))
	for _, p := range rows {
		providers = append(providers, gitProviderFrom(p))
	}

	c.JSON(http.StatusOK, gin.H{"providers": providers})
}

func handleGetGitHubAppInstallURL(c *gin.Context) {
	db, _ := c.Get("db")
	d, _ := db.(*database.DB)
	slug := strings.TrimSpace(settingValue(d, settingGitHubAppSlug, "GITHUB_APP_SLUG", ""))
	if slug == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "GITHUB_APP_SLUG is not configured"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"install_url": fmt.Sprintf("https://github.com/apps/%s/installations/new", slug),
	})
}

func handleConnectGitHubApp(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	var req ConnectGitHubAppRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	displayName := strings.TrimSpace(req.DisplayName)
	if displayName == "" {
		displayName = fmt.Sprintf("GitHub App #%d", req.InstallationID)
	}

	provider := GitProvider{
		ID:          uuid.NewString(),
		Name:        "github_app",
		DisplayName: displayName,
		APIUrl:      strings.TrimSpace(getenvOrDefault("GITHUB_APP_BASE_URL", "https://api.github.com")),
		WebhookUrl:  "https://github.com",
		AccessToken: strconv.FormatInt(req.InstallationID, 10),
		UserID:      ctx.userID,
	}

	prow, err := sqlcdb.New(ctx.db.DB).UpsertGitHubAppProvider(context.Background(), sqlcdb.UpsertGitHubAppProviderParams{
		ID:          uuid.MustParse(provider.ID),
		Name:        provider.Name,
		DisplayName: provider.DisplayName,
		ApiUrl:      provider.APIUrl,
		WebhookUrl:  provider.WebhookUrl,
		AccessToken: provider.AccessToken,
		UserID:      uuid.MustParse(provider.UserID),
	})
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to connect GitHub App installation"})
		return
	}
	provider.ID = prow.ID.String()
	provider.CreatedAt = prow.CreatedAt.Time
	provider.UpdatedAt = prow.UpdatedAt.Time

	provider.AccessToken = ""
	c.JSON(http.StatusOK, gin.H{
		"message":  "GitHub App connected",
		"provider": provider,
	})
}

func handleCreateGitProvider(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	var req CreateGitProviderRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	req.Name = strings.ToLower(strings.TrimSpace(req.Name))
	req.DisplayName = strings.TrimSpace(req.DisplayName)
	req.AccessToken = strings.TrimSpace(req.AccessToken)
	req.APIUrl = strings.TrimSpace(req.APIUrl)

	if !validateGitToken(req.Name, req.AccessToken) {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid access token for " + req.Name})
		return
	}

	provider := GitProvider{
		ID:          uuid.NewString(),
		Name:        req.Name,
		DisplayName: req.DisplayName,
		AccessToken: req.AccessToken,
		UserID:      ctx.userID,
	}

	switch req.Name {
	case "github":
		provider.APIUrl = "https://api.github.com"
		provider.WebhookUrl = "https://api.github.com"
	case "gitlab":
		provider.APIUrl = req.APIUrl
		if provider.APIUrl == "" {
			provider.APIUrl = strings.TrimSpace(getenvOrDefault("GITLAB_API_URL", "https://gitlab.com/api/v4"))
		}
		provider.APIUrl = strings.TrimSuffix(provider.APIUrl, "/")
		provider.WebhookUrl = strings.TrimSpace(getenvOrDefault("GITLAB_BASE_URL", "https://gitlab.com"))
	case "bitbucket":
		provider.APIUrl = req.APIUrl
		if provider.APIUrl == "" {
			provider.APIUrl = strings.TrimSpace(getenvOrDefault("BITBUCKET_API_URL", "https://api.bitbucket.org/2.0"))
		}
		provider.APIUrl = strings.TrimSuffix(provider.APIUrl, "/")
		provider.WebhookUrl = strings.TrimSpace(getenvOrDefault("BITBUCKET_BASE_URL", "https://bitbucket.org"))
	case "gitea":
		provider.APIUrl = req.APIUrl
		if provider.APIUrl == "" {
			provider.APIUrl = strings.TrimSpace(getenvOrDefault("GITEA_BASE_URL", "https://gitea.example.com"))
		}
		provider.APIUrl = strings.TrimSuffix(provider.APIUrl, "/")
		provider.WebhookUrl = provider.APIUrl
	case "github_app":
		provider.APIUrl = strings.TrimSpace(getenvOrDefault("GITHUB_APP_BASE_URL", "https://api.github.com"))
		provider.WebhookUrl = "https://github.com"
	default:
		c.JSON(http.StatusBadRequest, gin.H{"error": "Unsupported provider"})
		return
	}

	q := sqlcdb.New(ctx.db.DB)
	if err := q.InsertGitProvider(context.Background(), sqlcdb.InsertGitProviderParams{
		ID:          uuid.MustParse(provider.ID),
		Name:        provider.Name,
		DisplayName: provider.DisplayName,
		ApiUrl:      provider.APIUrl,
		WebhookUrl:  provider.WebhookUrl,
		AccessToken: provider.AccessToken,
		UserID:      uuid.MustParse(provider.UserID),
	}); err != nil {
		if isUniqueConstraintError(err) {
			c.JSON(http.StatusConflict, gin.H{"error": "Provider already connected for this account"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create Git provider"})
		return
	}

	if ts, err := q.GetGitProviderTimestamps(context.Background(), uuid.MustParse(provider.ID)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to read created provider"})
		return
	} else {
		provider.CreatedAt = ts.CreatedAt.Time
		provider.UpdatedAt = ts.UpdatedAt.Time
	}

	provider.AccessToken = ""
	c.JSON(http.StatusCreated, provider)
}

func handleGetGitRepositories(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	providerID := strings.TrimSpace(c.Param("providerId"))
	if _, err := uuid.Parse(providerID); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid provider ID"})
		return
	}

	q := sqlcdb.New(ctx.db.DB)
	provRow, err := q.GetGitProviderForRepos(context.Background(), sqlcdb.GetGitProviderForReposParams{
		ID:     uuid.MustParse(providerID),
		UserID: uuid.MustParse(ctx.userID),
	})
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			c.JSON(http.StatusNotFound, gin.H{"error": "Provider not found"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}
	providerName := provRow.Name
	providerDisplayName := provRow.DisplayName
	providerAccessToken := provRow.AccessToken
	providerAPIURL := provRow.ApiUrl

	if c.DefaultQuery("sync", "1") != "0" {
		if syncErr := syncProviderRepositories(ctx.db, providerID, ctx.userID, providerName, providerAPIURL, providerAccessToken); syncErr != nil {
			log.Printf("Git repository sync failed for provider %s (%s): %v", providerName, providerID, syncErr)
		}
	}

	page := positiveIntOrDefault(c.DefaultQuery("page", "1"), 1)
	limit := positiveIntOrDefault(c.DefaultQuery("limit", "20"), 20)
	if limit > 100 {
		limit = 100
	}
	offset := (page - 1) * limit
	search := strings.TrimSpace(c.Query("search"))

	repoRows, err := q.ListGitRepositories(context.Background(), sqlcdb.ListGitRepositoriesParams{
		ProviderID: uuid.MustParse(providerID),
		UserID:     uuid.MustParse(ctx.userID),
		Column3:    search,
		Limit:      int32(limit),
		Offset:     int32(offset),
	})
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}

	repositories := make([]GitRepository, 0, len(repoRows))
	for _, r := range repoRows {
		repositories = append(repositories, gitRepoFrom(r))
	}

	total, err := q.CountGitRepositories(context.Background(), sqlcdb.CountGitRepositoriesParams{
		ProviderID: uuid.MustParse(providerID),
		UserID:     uuid.MustParse(ctx.userID),
		Column3:    search,
	})
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"provider": gin.H{
			"id":           providerID,
			"name":         providerName,
			"display_name": providerDisplayName,
		},
		"repositories": repositories,
		"pagination": gin.H{
			"page":  page,
			"limit": limit,
			"total": total,
		},
	})
}

func handleConnectGitRepository(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	var req CreateGitRepoRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	providerID := strings.TrimSpace(req.ProviderID)
	if _, err := uuid.Parse(providerID); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid provider ID"})
		return
	}

	q := sqlcdb.New(ctx.db.DB)
	providerName, err := q.GetGitProviderName(context.Background(), sqlcdb.GetGitProviderNameParams{
		ID:     uuid.MustParse(providerID),
		UserID: uuid.MustParse(ctx.userID),
	})
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			c.JSON(http.StatusNotFound, gin.H{"error": "Provider not found"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}

	repoName, fullName, err := normalizeRepositoryFullName(req.RepoFullName)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	existingRow, err := q.GetGitRepositoryByFullName(context.Background(), sqlcdb.GetGitRepositoryByFullNameParams{
		ProviderID: uuid.MustParse(providerID),
		FullName:   fullName,
		UserID:     uuid.MustParse(ctx.userID),
	})
	switch {
	case err == nil:
		c.JSON(http.StatusOK, gin.H{
			"message":    "Repository already connected",
			"repository": gitRepoFromFullNameRow(existingRow),
		})
		return
	case !errors.Is(err, sql.ErrNoRows):
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}

	repo := GitRepository{
		ID:            uuid.NewString(),
		ProviderID:    providerID,
		Name:          repoName,
		FullName:      fullName,
		Description:   "",
		CloneURL:      deriveCloneURL(providerName, fullName),
		DefaultBranch: "main",
		IsPrivate:     false,
		UserID:        ctx.userID,
	}

	ins, err := q.InsertGitRepository(context.Background(), sqlcdb.InsertGitRepositoryParams{
		ID:            uuid.MustParse(repo.ID),
		ProviderID:    uuid.MustParse(repo.ProviderID),
		Name:          repo.Name,
		FullName:      repo.FullName,
		Description:   sql.NullString{String: repo.Description, Valid: true},
		CloneUrl:      repo.CloneURL,
		DefaultBranch: sql.NullString{String: repo.DefaultBranch, Valid: true},
		IsPrivate:     sql.NullBool{Bool: repo.IsPrivate, Valid: true},
		UserID:        uuid.MustParse(repo.UserID),
	})
	if err != nil {
		if isUniqueConstraintError(err) {
			c.JSON(http.StatusConflict, gin.H{"error": "Repository is already connected"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to connect repository"})
		return
	}
	repo.CreatedAt = ins.CreatedAt.Time
	repo.UpdatedAt = ins.UpdatedAt.Time

	c.JSON(http.StatusCreated, gin.H{
		"message":    "Repository connected successfully",
		"repository": repo,
	})
}

func handleCreateWebhook(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	var req CreateWebhookRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if len(req.Events) == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "events cannot be empty"})
		return
	}

	repoID := strings.TrimSpace(req.RepoID)
	if _, err := uuid.Parse(repoID); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid repository ID"})
		return
	}

	providerUUID, err := sqlcdb.New(ctx.db.DB).GetGitRepositoryProviderID(context.Background(), sqlcdb.GetGitRepositoryProviderIDParams{
		ID:     uuid.MustParse(repoID),
		UserID: uuid.MustParse(ctx.userID),
	})
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			c.JSON(http.StatusNotFound, gin.H{"error": "Repository not found"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}
	providerID := providerUUID.String()

	eventsJSON, err := json.Marshal(req.Events)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid events payload"})
		return
	}

	secret, err := generateWebhookSecret()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to generate webhook secret"})
		return
	}

	webhook := GitWebhook{
		ID:         uuid.NewString(),
		RepoID:     repoID,
		ProviderID: providerID,
		Events:     string(eventsJSON),
		Secret:     secret,
		Active:     true,
	}

	wrow, err := sqlcdb.New(ctx.db.DB).UpsertGitWebhook(context.Background(), sqlcdb.UpsertGitWebhookParams{
		ID:            uuid.MustParse(webhook.ID),
		RepoID:        uuid.MustParse(webhook.RepoID),
		ProviderID:    uuid.MustParse(webhook.ProviderID),
		Events:        webhook.Events,
		WebhookSecret: webhook.Secret,
		BranchFilter:  sql.NullString{String: strings.TrimSpace(req.Branch), Valid: true},
	})
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to configure webhook"})
		return
	}
	webhook.ID = wrow.ID.String()
	webhook.Active = wrow.Active.Bool
	webhook.CreatedAt = wrow.CreatedAt.Time
	webhook.UpdatedAt = wrow.UpdatedAt.Time

	c.JSON(http.StatusCreated, gin.H{
		"message": "Webhook configured successfully",
		"webhook": gin.H{
			"id":          webhook.ID,
			"repo_id":     webhook.RepoID,
			"provider_id": webhook.ProviderID,
			"events":      req.Events,
			"branch":      strings.TrimSpace(req.Branch),
			"active":      webhook.Active,
			"created_at":  webhook.CreatedAt,
			"updated_at":  webhook.UpdatedAt,
		},
	})
}

func handleGetConnectedRepositories(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	page := positiveIntOrDefault(c.DefaultQuery("page", "1"), 1)
	limit := positiveIntOrDefault(c.DefaultQuery("limit", "10"), 10)
	if limit > 100 {
		limit = 100
	}
	offset := (page - 1) * limit

	q := sqlcdb.New(ctx.db.DB)
	repoRows, err := q.ListConnectedRepositories(context.Background(), sqlcdb.ListConnectedRepositoriesParams{
		UserID: uuid.MustParse(ctx.userID),
		Limit:  int32(limit),
		Offset: int32(offset),
	})
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}

	repositories := make([]map[string]interface{}, 0, len(repoRows))
	for _, r := range repoRows {
		repositories = append(repositories, map[string]interface{}{
			"id":             r.ID.String(),
			"provider_id":    r.ProviderID.String(),
			"name":           r.Name,
			"full_name":      r.FullName,
			"description":    r.Description,
			"clone_url":      r.CloneUrl,
			"default_branch": r.DefaultBranch.String,
			"is_private":     r.IsPrivate.Bool,
			"created_at":     r.CreatedAt.Time,
			"updated_at":     r.UpdatedAt.Time,
			"provider": map[string]string{
				"name":         r.ProviderName,
				"display_name": r.DisplayName,
			},
		})
	}

	total, err := q.CountUserRepositories(context.Background(), uuid.MustParse(ctx.userID))
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"repositories": repositories,
		"pagination": gin.H{
			"page":  page,
			"limit": limit,
			"total": total,
		},
	})
}

type remoteGitRepository struct {
	Name          string
	FullName      string
	Description   string
	CloneURL      string
	DefaultBranch string
	IsPrivate     bool
}

func syncProviderRepositories(db *database.DB, providerID, userID, providerName, providerAPIURL, accessToken string) error {
	repositories, err := fetchProviderRepositories(providerName, providerAPIURL, accessToken)
	if err != nil {
		return err
	}

	for _, repository := range repositories {
		if strings.TrimSpace(repository.FullName) == "" || strings.TrimSpace(repository.Name) == "" {
			continue
		}

		cloneURL := strings.TrimSpace(repository.CloneURL)
		if cloneURL == "" {
			cloneURL = deriveCloneURL(providerName, repository.FullName)
		}

		defaultBranch := strings.TrimSpace(repository.DefaultBranch)
		if defaultBranch == "" {
			defaultBranch = "main"
		}

		err := sqlcdb.New(db.DB).UpsertGitRepository(context.Background(), sqlcdb.UpsertGitRepositoryParams{
			ID:            uuid.New(),
			ProviderID:    uuid.MustParse(providerID),
			Name:          repository.Name,
			FullName:      repository.FullName,
			Description:   sql.NullString{String: repository.Description, Valid: true},
			CloneUrl:      cloneURL,
			DefaultBranch: sql.NullString{String: defaultBranch, Valid: true},
			IsPrivate:     sql.NullBool{Bool: repository.IsPrivate, Valid: true},
			UserID:        uuid.MustParse(userID),
		})
		if err != nil {
			return err
		}
	}

	return nil
}

func fetchProviderRepositories(providerName, providerAPIURL, accessToken string) ([]remoteGitRepository, error) {
	switch strings.ToLower(strings.TrimSpace(providerName)) {
	case "github":
		return fetchGitHubRepositories(providerAPIURL, accessToken)
	case "github_app":
		return fetchGitHubAppRepositories(providerAPIURL, accessToken)
	case "gitlab":
		return fetchGitLabRepositories(providerAPIURL, accessToken)
	case "bitbucket":
		return fetchBitbucketRepositories(providerAPIURL, accessToken)
	case "gitea":
		return fetchGiteaRepositories(providerAPIURL, accessToken)
	default:
		return nil, nil
	}
}

func fetchGitHubRepositories(providerAPIURL, accessToken string) ([]remoteGitRepository, error) {
	if strings.TrimSpace(accessToken) == "" {
		return nil, fmt.Errorf("github access token is missing")
	}

	baseURL := strings.TrimSpace(providerAPIURL)
	if baseURL == "" {
		baseURL = "https://api.github.com"
	}
	baseURL = strings.TrimSuffix(baseURL, "/")

	request, err := http.NewRequest(http.MethodGet, baseURL+"/user/repos?per_page=100&sort=updated", nil)
	if err != nil {
		return nil, err
	}

	request.Header.Set("Accept", "application/vnd.github+json")
	request.Header.Set("Authorization", "Bearer "+strings.TrimSpace(accessToken))

	client := &http.Client{Timeout: 10 * time.Second}
	response, err := client.Do(request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()

	if response.StatusCode != http.StatusOK {
		payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
		return nil, fmt.Errorf("github repos request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
	}

	var rows []map[string]interface{}
	if err := json.NewDecoder(response.Body).Decode(&rows); err != nil {
		return nil, err
	}

	result := make([]remoteGitRepository, 0, len(rows))
	for _, row := range rows {
		fullName := asGitString(row["full_name"])
		name := asGitString(row["name"])
		if fullName == "" || name == "" {
			continue
		}
		result = append(result, remoteGitRepository{
			Name:          name,
			FullName:      fullName,
			Description:   asGitString(row["description"]),
			CloneURL:      asGitString(row["clone_url"]),
			DefaultBranch: asGitString(row["default_branch"]),
			IsPrivate:     asBoolValue(row["private"]),
		})
	}

	return result, nil
}

func fetchGitHubAppRepositories(providerAPIURL, installationIDRaw string) ([]remoteGitRepository, error) {
	installationID, err := strconv.ParseInt(strings.TrimSpace(installationIDRaw), 10, 64)
	if err != nil || installationID <= 0 {
		return nil, fmt.Errorf("github_app installation id is invalid")
	}

	baseURL := strings.TrimSpace(providerAPIURL)
	if baseURL == "" {
		baseURL = strings.TrimSpace(getenvOrDefault("GITHUB_APP_BASE_URL", "https://api.github.com"))
	}
	baseURL = strings.TrimSuffix(baseURL, "/")

	token, err := getGitHubAppInstallationToken(baseURL, installationID)
	if err != nil {
		return nil, err
	}

	request, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/installation/repositories?per_page=100", baseURL), nil)
	if err != nil {
		return nil, err
	}
	request.Header.Set("Accept", "application/vnd.github+json")
	request.Header.Set("Authorization", "Bearer "+token)

	client := &http.Client{Timeout: 10 * time.Second}
	response, err := client.Do(request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()

	if response.StatusCode != http.StatusOK {
		payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
		return nil, fmt.Errorf("github app repos request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
	}

	var wrapper struct {
		Repositories []map[string]interface{} `json:"repositories"`
	}
	if err := json.NewDecoder(response.Body).Decode(&wrapper); err != nil {
		return nil, err
	}

	result := make([]remoteGitRepository, 0, len(wrapper.Repositories))
	for _, row := range wrapper.Repositories {
		fullName := asGitString(row["full_name"])
		name := asGitString(row["name"])
		if fullName == "" || name == "" {
			continue
		}
		result = append(result, remoteGitRepository{
			Name:          name,
			FullName:      fullName,
			Description:   asGitString(row["description"]),
			CloneURL:      asGitString(row["clone_url"]),
			DefaultBranch: asGitString(row["default_branch"]),
			IsPrivate:     asBoolValue(row["private"]),
		})
	}

	return result, nil
}

func fetchGiteaRepositories(providerAPIURL, accessToken string) ([]remoteGitRepository, error) {
	if strings.TrimSpace(accessToken) == "" {
		return nil, fmt.Errorf("gitea access token is missing")
	}

	baseURL := strings.TrimSpace(providerAPIURL)
	if baseURL == "" {
		baseURL = strings.TrimSpace(getenvOrDefault("GITEA_BASE_URL", "https://gitea.example.com"))
	}
	baseURL = strings.TrimSuffix(baseURL, "/")

	request, err := http.NewRequest(http.MethodGet, baseURL+"/api/v1/user/repos?limit=100", nil)
	if err != nil {
		return nil, err
	}

	request.Header.Set("Accept", "application/json")
	request.Header.Set("Authorization", "token "+strings.TrimSpace(accessToken))

	client := &http.Client{Timeout: 10 * time.Second}
	response, err := client.Do(request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()

	if response.StatusCode != http.StatusOK {
		payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
		return nil, fmt.Errorf("gitea repos request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
	}

	var rows []map[string]interface{}
	if err := json.NewDecoder(response.Body).Decode(&rows); err != nil {
		return nil, err
	}

	result := make([]remoteGitRepository, 0, len(rows))
	for _, row := range rows {
		fullName := asGitString(row["full_name"])
		name := asGitString(row["name"])
		if fullName == "" || name == "" {
			continue
		}
		result = append(result, remoteGitRepository{
			Name:          name,
			FullName:      fullName,
			Description:   asGitString(row["description"]),
			CloneURL:      asGitString(row["clone_url"]),
			DefaultBranch: asGitString(row["default_branch"]),
			IsPrivate:     asBoolValue(row["private"]),
		})
	}

	return result, nil
}

func fetchGitLabRepositories(providerAPIURL, accessToken string) ([]remoteGitRepository, error) {
	if strings.TrimSpace(accessToken) == "" {
		return nil, fmt.Errorf("gitlab access token is missing")
	}

	baseURL := strings.TrimSpace(providerAPIURL)
	if baseURL == "" {
		baseURL = strings.TrimSpace(getenvOrDefault("GITLAB_API_URL", "https://gitlab.com/api/v4"))
	}
	baseURL = strings.TrimSuffix(baseURL, "/")

	request, err := http.NewRequest(http.MethodGet, baseURL+"/projects?membership=true&simple=true&per_page=100&order_by=last_activity_at&sort=desc", nil)
	if err != nil {
		return nil, err
	}

	request.Header.Set("Accept", "application/json")
	request.Header.Set("PRIVATE-TOKEN", strings.TrimSpace(accessToken))
	request.Header.Set("Authorization", "Bearer "+strings.TrimSpace(accessToken))

	client := &http.Client{Timeout: 10 * time.Second}
	response, err := client.Do(request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()

	if response.StatusCode != http.StatusOK {
		payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
		return nil, fmt.Errorf("gitlab repos request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
	}

	var rows []map[string]interface{}
	if err := json.NewDecoder(response.Body).Decode(&rows); err != nil {
		return nil, err
	}

	result := make([]remoteGitRepository, 0, len(rows))
	for _, row := range rows {
		fullName := asGitString(row["path_with_namespace"])
		name := asGitString(row["name"])
		if fullName == "" || name == "" {
			continue
		}

		visibility := strings.ToLower(asGitString(row["visibility"]))
		isPrivate := visibility == "private"
		if visibility == "" {
			isPrivate = asBoolValue(row["private"])
		}

		result = append(result, remoteGitRepository{
			Name:          name,
			FullName:      fullName,
			Description:   asGitString(row["description"]),
			CloneURL:      asGitString(row["http_url_to_repo"]),
			DefaultBranch: asGitString(row["default_branch"]),
			IsPrivate:     isPrivate,
		})
	}

	return result, nil
}

func fetchBitbucketRepositories(providerAPIURL, accessToken string) ([]remoteGitRepository, error) {
	if strings.TrimSpace(accessToken) == "" {
		return nil, fmt.Errorf("bitbucket access token is missing")
	}

	baseURL := strings.TrimSpace(providerAPIURL)
	if baseURL == "" {
		baseURL = strings.TrimSpace(getenvOrDefault("BITBUCKET_API_URL", "https://api.bitbucket.org/2.0"))
	}
	baseURL = strings.TrimSuffix(baseURL, "/")

	client := &http.Client{Timeout: 12 * time.Second}
	nextURL := baseURL + "/repositories?role=member&pagelen=100"
	maxPages := 5
	result := make([]remoteGitRepository, 0, 128)

	for page := 0; page < maxPages && nextURL != ""; page++ {
		request, err := http.NewRequest(http.MethodGet, nextURL, nil)
		if err != nil {
			return nil, err
		}
		request.Header.Set("Accept", "application/json")
		request.Header.Set("Authorization", "Bearer "+strings.TrimSpace(accessToken))

		response, err := client.Do(request)
		if err != nil {
			return nil, err
		}

		if response.StatusCode != http.StatusOK {
			payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
			response.Body.Close()
			return nil, fmt.Errorf("bitbucket repos request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
		}

		var payload struct {
			Values []map[string]interface{} `json:"values"`
			Next   string                   `json:"next"`
		}
		if err := json.NewDecoder(response.Body).Decode(&payload); err != nil {
			response.Body.Close()
			return nil, err
		}
		response.Body.Close()

		for _, row := range payload.Values {
			fullName := asGitString(row["full_name"])
			name := asGitString(row["name"])
			if fullName == "" || name == "" {
				continue
			}

			defaultBranch := "main"
			if branch, ok := row["mainbranch"].(map[string]interface{}); ok {
				if parsed := asGitString(branch["name"]); parsed != "" {
					defaultBranch = parsed
				}
			}

			cloneURL := ""
			if links, ok := row["links"].(map[string]interface{}); ok {
				if cloneLinks, ok := links["clone"].([]interface{}); ok {
					for _, raw := range cloneLinks {
						link, ok := raw.(map[string]interface{})
						if !ok {
							continue
						}
						if strings.EqualFold(asGitString(link["name"]), "https") {
							cloneURL = asGitString(link["href"])
							break
						}
					}
				}
			}

			result = append(result, remoteGitRepository{
				Name:          name,
				FullName:      fullName,
				Description:   asGitString(row["description"]),
				CloneURL:      cloneURL,
				DefaultBranch: defaultBranch,
				IsPrivate:     asBoolValue(row["is_private"]),
			})
		}

		nextURL = strings.TrimSpace(payload.Next)
	}

	return result, nil
}

func getGitHubAppInstallationToken(baseURL string, installationID int64) (string, error) {
	appID := platformSetting(settingGitHubAppID, "GITHUB_APP_ID")
	privateKeyPEM := platformSetting(settingGitHubAppPrivateKey, "GITHUB_APP_PRIVATE_KEY")
	if appID == "" || privateKeyPEM == "" {
		return "", fmt.Errorf("GITHUB_APP_ID and GITHUB_APP_PRIVATE_KEY must be configured")
	}

	jwtToken, err := createGitHubAppJWT(appID, privateKeyPEM)
	if err != nil {
		return "", err
	}

	request, err := http.NewRequest(http.MethodPost, fmt.Sprintf("%s/app/installations/%d/access_tokens", strings.TrimSuffix(baseURL, "/"), installationID), nil)
	if err != nil {
		return "", err
	}

	request.Header.Set("Accept", "application/vnd.github+json")
	request.Header.Set("Authorization", "Bearer "+jwtToken)

	client := &http.Client{Timeout: 10 * time.Second}
	response, err := client.Do(request)
	if err != nil {
		return "", err
	}
	defer response.Body.Close()

	if response.StatusCode != http.StatusCreated {
		payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
		return "", fmt.Errorf("github app token request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
	}

	var body struct {
		Token string `json:"token"`
	}
	if err := json.NewDecoder(response.Body).Decode(&body); err != nil {
		return "", err
	}
	if strings.TrimSpace(body.Token) == "" {
		return "", fmt.Errorf("github app token response missing token")
	}
	return body.Token, nil
}

func createGitHubAppJWT(appID, privateKeyPEM string) (string, error) {
	privateKey, err := parseGitHubAppPrivateKey(privateKeyPEM)
	if err != nil {
		return "", err
	}

	now := time.Now().UTC()
	claims := jwt.RegisteredClaims{
		Issuer:    strings.TrimSpace(appID),
		IssuedAt:  jwt.NewNumericDate(now.Add(-60 * time.Second)),
		ExpiresAt: jwt.NewNumericDate(now.Add(9 * time.Minute)),
	}
	token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
	return token.SignedString(privateKey)
}

func parseGitHubAppPrivateKey(raw string) (*rsa.PrivateKey, error) {
	normalized := strings.ReplaceAll(strings.TrimSpace(raw), "\\n", "\n")
	block, _ := pem.Decode([]byte(normalized))
	if block == nil {
		return nil, fmt.Errorf("invalid github app private key format")
	}

	if key, err := x509.ParsePKCS1PrivateKey(block.Bytes); err == nil {
		return key, nil
	}

	parsed, err := x509.ParsePKCS8PrivateKey(block.Bytes)
	if err != nil {
		return nil, err
	}
	privateKey, ok := parsed.(*rsa.PrivateKey)
	if !ok {
		return nil, fmt.Errorf("github app private key is not RSA")
	}
	return privateKey, nil
}

func asGitString(value interface{}) string {
	if value == nil {
		return ""
	}
	switch typed := value.(type) {
	case string:
		return strings.TrimSpace(typed)
	default:
		return strings.TrimSpace(fmt.Sprint(typed))
	}
}

func asBoolValue(value interface{}) bool {
	switch typed := value.(type) {
	case bool:
		return typed
	case string:
		parsed, _ := strconv.ParseBool(strings.TrimSpace(typed))
		return parsed
	default:
		return false
	}
}

func getenvOrDefault(key, fallback string) string {
	value := strings.TrimSpace(os.Getenv(key))
	if value == "" {
		return fallback
	}
	return value
}

func validateGitToken(provider, token string) bool {
	token = strings.TrimSpace(token)
	if token == "" {
		return false
	}
	if strings.EqualFold(strings.TrimSpace(provider), "github_app") {
		installationID, err := strconv.ParseInt(token, 10, 64)
		return err == nil && installationID > 0
	}
	return true
}

type gitRequestContext struct {
	userID string
	db     *database.DB
}

func requireGitRequestContext(c *gin.Context) (*gitRequestContext, bool) {
	userID, ok := requireAuthenticatedUserID(c)
	if !ok {
		return nil, false
	}

	dbValue, exists := c.Get("db")
	if !exists {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database context not found"})
		return nil, false
	}

	db, ok := dbValue.(*database.DB)
	if !ok || db == nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Invalid database context"})
		return nil, false
	}

	return &gitRequestContext{
		userID: userID,
		db:     db,
	}, true
}

func positiveIntOrDefault(raw string, fallback int) int {
	value, err := strconv.Atoi(raw)
	if err != nil || value <= 0 {
		return fallback
	}
	return value
}

func isUniqueConstraintError(err error) bool {
	if err == nil {
		return false
	}
	lower := strings.ToLower(err.Error())
	return strings.Contains(lower, "duplicate key") || strings.Contains(lower, "unique constraint")
}

func normalizeRepositoryFullName(input string) (name string, fullName string, err error) {
	value := strings.TrimSpace(input)
	if value == "" {
		return "", "", fmt.Errorf("repo_full_name is required")
	}

	if parsed, parseErr := url.Parse(value); parseErr == nil && parsed.Scheme != "" && parsed.Host != "" {
		path := strings.Trim(parsed.Path, "/")
		if path != "" {
			value = path
		}
	}

	if strings.HasPrefix(strings.ToLower(value), "git@") {
		if separator := strings.Index(value, ":"); separator != -1 && separator+1 < len(value) {
			value = value[separator+1:]
		}
	}

	value = strings.TrimSuffix(value, ".git")
	parts := strings.Split(strings.Trim(value, "/"), "/")
	if len(parts) != 2 {
		return "", "", fmt.Errorf("repo_full_name must be in owner/repository format")
	}
	if strings.TrimSpace(parts[0]) == "" || strings.TrimSpace(parts[1]) == "" {
		return "", "", fmt.Errorf("repo_full_name must be in owner/repository format")
	}
	for _, part := range parts {
		if strings.ContainsAny(part, " \t\r\n") {
			return "", "", fmt.Errorf("repo_full_name cannot include whitespace")
		}
	}

	return parts[1], parts[0] + "/" + parts[1], nil
}

func deriveCloneURL(provider, repoFullName string) string {
	switch strings.ToLower(strings.TrimSpace(provider)) {
	case "github":
		return fmt.Sprintf("https://github.com/%s.git", repoFullName)
	case "github_app":
		return fmt.Sprintf("https://github.com/%s.git", repoFullName)
	case "gitlab":
		baseURL := strings.TrimSuffix(strings.TrimSpace(getenvOrDefault("GITLAB_BASE_URL", "https://gitlab.com")), "/")
		return fmt.Sprintf("%s/%s.git", baseURL, repoFullName)
	case "bitbucket":
		baseURL := strings.TrimSuffix(strings.TrimSpace(getenvOrDefault("BITBUCKET_BASE_URL", "https://bitbucket.org")), "/")
		return fmt.Sprintf("%s/%s.git", baseURL, repoFullName)
	case "gitea":
		baseURL := strings.TrimSuffix(strings.TrimSpace(getenvOrDefault("GITEA_BASE_URL", "https://gitea.example.com")), "/")
		return fmt.Sprintf("%s/%s.git", baseURL, repoFullName)
	default:
		return repoFullName
	}
}

func generateWebhookSecret() (string, error) {
	buf := make([]byte, 24)
	if _, err := rand.Read(buf); err != nil {
		return "", err
	}
	return hex.EncodeToString(buf), nil
}

// handleDeleteGitProvider removes a provider connection. Repositories and
// webhooks are removed by ON DELETE CASCADE.
func handleDeleteGitProvider(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	providerID := strings.TrimSpace(c.Param("providerId"))
	if _, err := uuid.Parse(providerID); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid provider ID"})
		return
	}

	affected, err := sqlcdb.New(ctx.db.DB).DeleteGitProvider(context.Background(), sqlcdb.DeleteGitProviderParams{
		ID:     uuid.MustParse(providerID),
		UserID: uuid.MustParse(ctx.userID),
	})
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to delete provider"})
		return
	}

	if affected == 0 {
		c.JSON(http.StatusNotFound, gin.H{"error": "Provider not found"})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "Provider disconnected"})
}

// handleGetGitRepositoryBranches lists branches for a repository through the
// provider's stored credentials.
func handleGetGitRepositoryBranches(c *gin.Context) {
	ctx, ok := requireGitRequestContext(c)
	if !ok {
		return
	}

	providerID := strings.TrimSpace(c.Param("providerId"))
	if _, err := uuid.Parse(providerID); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid provider ID"})
		return
	}

	owner := strings.TrimSpace(c.Param("owner"))
	repo := strings.TrimSpace(c.Param("repo"))
	if owner == "" || repo == "" || strings.ContainsAny(owner+repo, " \t\r\n") {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid repository reference"})
		return
	}

	pf, err := sqlcdb.New(ctx.db.DB).GetGitProviderForFetch(context.Background(), sqlcdb.GetGitProviderForFetchParams{
		ID:     uuid.MustParse(providerID),
		UserID: uuid.MustParse(ctx.userID),
	})
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			c.JSON(http.StatusNotFound, gin.H{"error": "Provider not found"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
		return
	}
	providerName := pf.Name
	providerAPIURL := pf.ApiUrl
	providerAccessToken := pf.AccessToken

	branches, err := fetchRepositoryBranches(providerName, providerAPIURL, providerAccessToken, owner, repo)
	if err != nil {
		log.Printf("branch fetch failed for %s/%s via %s: %v", owner, repo, providerName, err)
		c.JSON(http.StatusBadGateway, gin.H{"error": "Failed to fetch branches from provider"})
		return
	}

	c.JSON(http.StatusOK, gin.H{"branches": branches})
}

type remoteBranch struct {
	Name      string `json:"name"`
	Protected bool   `json:"protected"`
}

func fetchRepositoryBranches(providerName, providerAPIURL, accessToken, owner, repo string) ([]remoteBranch, error) {
	switch strings.ToLower(strings.TrimSpace(providerName)) {
	case "github", "github_app":
		return fetchGitHubBranches(providerName, providerAPIURL, accessToken, owner, repo)
	case "gitea":
		return fetchGiteaBranches(providerAPIURL, accessToken, owner, repo)
	default:
		return nil, fmt.Errorf("branch listing is not supported for provider %s", providerName)
	}
}

func fetchGitHubBranches(providerName, providerAPIURL, accessToken, owner, repo string) ([]remoteBranch, error) {
	baseURL := strings.TrimSuffix(strings.TrimSpace(providerAPIURL), "/")
	if baseURL == "" {
		baseURL = "https://api.github.com"
	}

	token := strings.TrimSpace(accessToken)
	if strings.EqualFold(providerName, "github_app") {
		installationID, err := strconv.ParseInt(token, 10, 64)
		if err != nil || installationID <= 0 {
			return nil, fmt.Errorf("github_app installation id is invalid")
		}
		token, err = getGitHubAppInstallationToken(baseURL, installationID)
		if err != nil {
			return nil, err
		}
	}
	if token == "" {
		return nil, fmt.Errorf("github access token is missing")
	}

	branches := make([]remoteBranch, 0)
	for page := 1; page <= 5; page++ {
		request, err := http.NewRequest(http.MethodGet,
			fmt.Sprintf("%s/repos/%s/%s/branches?per_page=100&page=%d", baseURL, owner, repo, page), nil)
		if err != nil {
			return nil, err
		}
		request.Header.Set("Accept", "application/vnd.github+json")
		request.Header.Set("Authorization", "Bearer "+token)

		client := &http.Client{Timeout: 10 * time.Second}
		response, err := client.Do(request)
		if err != nil {
			return nil, err
		}

		if response.StatusCode != http.StatusOK {
			payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
			response.Body.Close()
			return nil, fmt.Errorf("github branches request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
		}

		var rows []map[string]interface{}
		decodeErr := json.NewDecoder(response.Body).Decode(&rows)
		response.Body.Close()
		if decodeErr != nil {
			return nil, decodeErr
		}

		for _, row := range rows {
			name := asGitString(row["name"])
			if name == "" {
				continue
			}
			branches = append(branches, remoteBranch{Name: name, Protected: asBoolValue(row["protected"])})
		}

		if len(rows) < 100 {
			break
		}
	}

	return branches, nil
}

func fetchGiteaBranches(providerAPIURL, accessToken, owner, repo string) ([]remoteBranch, error) {
	baseURL := strings.TrimSuffix(strings.TrimSpace(providerAPIURL), "/")
	if baseURL == "" {
		baseURL = strings.TrimSuffix(strings.TrimSpace(getenvOrDefault("GITEA_BASE_URL", "")), "/")
	}
	if baseURL == "" {
		return nil, fmt.Errorf("gitea api_url is required")
	}

	request, err := http.NewRequest(http.MethodGet,
		fmt.Sprintf("%s/api/v1/repos/%s/%s/branches?limit=100", baseURL, owner, repo), nil)
	if err != nil {
		return nil, err
	}
	request.Header.Set("Accept", "application/json")
	if token := strings.TrimSpace(accessToken); token != "" {
		request.Header.Set("Authorization", "token "+token)
	}

	client := &http.Client{Timeout: 10 * time.Second}
	response, err := client.Do(request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()

	if response.StatusCode != http.StatusOK {
		payload, _ := io.ReadAll(io.LimitReader(response.Body, 2048))
		return nil, fmt.Errorf("gitea branches request failed with status %d: %s", response.StatusCode, strings.TrimSpace(string(payload)))
	}

	var rows []map[string]interface{}
	if err := json.NewDecoder(response.Body).Decode(&rows); err != nil {
		return nil, err
	}

	branches := make([]remoteBranch, 0, len(rows))
	for _, row := range rows {
		if name := asGitString(row["name"]); name != "" {
			branches = append(branches, remoteBranch{Name: name, Protected: asBoolValue(row["protected"])})
		}
	}
	return branches, nil
}