package config

import (
	"log"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/joho/godotenv"
)

// Config holds all configuration for the application
type Config struct {
	// App settings
	AppEnv  string
	Port    string
	Debug   bool
	Premium bool

	// Database settings
	DatabaseURL        string
	MaxIdleConnections int
	MaxOpenConnections int
	ConnMaxLifetime    time.Duration

	// JWT settings
	JWTSecret     string
	JWTExpiration time.Duration

	// Server settings
	ReadTimeout  time.Duration
	WriteTimeout time.Duration
	IdleTimeout  time.Duration
	// Security
	ContentSecurityPolicy string

	// File upload settings
	UploadDir        string
	MaxUploadSize    int64
	AllowedMimeTypes []string

	// Email settings
	SMTPHost       string
	SMTPPort       int
	SMTPUser       string
	SMTPPassword   string
	SMTPFrom       string
	SMTPFromName   string
	SMTPEncryption string
	SMTPAuth       bool
	SMTPSkipVerify bool

	// Email templates
	EmailTemplateDir string

	// Contact settings
	ContactEmail string
	AdminEmail   string
	// Admin access token (optional) to allow token-based admin access
	AdminAccessToken string

	// Newsletter settings
	NewsletterEnabled bool

	// CORS settings
	AllowedOrigins []string

	// External services
	ScraperBaseURL   string
	FrontendBaseURL  string
	PublicAPIBaseURL string
	ZoneramaAPIBase  string

	// Umami Analytics
	UmamiURL       string
	UmamiUsername  string
	UmamiPassword  string
	UmamiWebsiteID string

	ErrorIngestURL   string
	ErrorIngestToken string

	// Antivirus (optional)
	ClamAVEnabled bool
	ClamAVHost    string
	ClamAVPort    int

	// Feature flags
	RembgEnabled bool
	// Club data mode: "auto" (FACR integration) or "manual" (no FACR/http scraping)
	ClubDataMode string

	// E-shop settings
	EshopEnabled     bool
	EshopFrontendURL string
	EshopAPIURL      string

	// Stripe (E-shop payments)
	StripeEnabled        bool
	StripeSecretKey      string
	StripePublishableKey string
	StripeWebhookSecret  string
	StripeCurrency       string
	StripeReturnURL      string

	// Revolut (E-shop payments)
	RevolutEnabled       bool
	RevolutEnvironment   string
	RevolutAPIKey        string
	RevolutPublicKey     string
	RevolutWebhookSecret string
	RevolutReturnURL     string
	RevolutWebhookURL    string

	// Packeta / Zasilkovna
	PacketaAPIPassword  string
	PacketaWidgetAPIKey string
	PacketaEshopName    string
	PacketaEnv          string

	// DeepSeek AI Support
	DeepSeekAPIKey  string
	DeepSeekBaseURL string
}

var AppConfig *Config

// LoadConfig loads the configuration from environment variables
func LoadConfig() {
	// Load .env file if it exists
	_ = godotenv.Load()

	AppConfig = &Config{
		// App settings
		AppEnv:  getEnv("APP_ENV", "development"),
		Port:    getEnv("PORT", "8080"),
		Debug:   getEnvAsBool("DEBUG", true),
		Premium: getEnvAsBool("PREMIUM", false),

		// Database settings
		DatabaseURL:        getEnv("DATABASE_URL", "postgres://postgres:postgres@localhost:5432/fotbal_club?sslmode=disable"),
		MaxIdleConnections: getEnvAsInt("DB_MAX_IDLE_CONNS", 10),
		MaxOpenConnections: getEnvAsInt("DB_MAX_OPEN_CONNS", 100),
		ConnMaxLifetime:    time.Duration(getEnvAsInt("DB_CONN_MAX_LIFETIME", 60)) * time.Minute,

		// JWT settings
		JWTSecret:     getEnv("JWT_SECRET", "default-secret-key-change-in-production"),
		JWTExpiration: time.Duration(getEnvAsInt("JWT_EXPIRATION_HOURS", 24)) * time.Hour,

		// Server settings
		ReadTimeout:  time.Duration(getEnvAsInt("READ_TIMEOUT", 5)) * time.Second,
		WriteTimeout: time.Duration(getEnvAsInt("WRITE_TIMEOUT", 10)) * time.Second,
		IdleTimeout:  time.Duration(getEnvAsInt("IDLE_TIMEOUT", 120)) * time.Second,

		// Security
		ContentSecurityPolicy: getEnv("CONTENT_SECURITY_POLICY", "default-src 'self' data: blob: https: http:; img-src * data: blob:; style-src 'self' 'unsafe-inline' https: http:; script-src 'self' 'unsafe-inline' 'unsafe-eval' https: http:; connect-src *; frame-ancestors 'self';"),

		// File upload settings
		UploadDir:     getEnv("UPLOAD_DIR", "./uploads"),
		MaxUploadSize: int64(getEnvAsInt("MAX_UPLOAD_SIZE", 20)) * 1024 * 1024, // 20MB default
		AllowedMimeTypes: []string{
			// Images
			"image/jpeg",
			"image/png",
			"image/gif",
			"image/webp",
			"image/svg+xml",
			// Documents
			"application/pdf",
			"application/msword", // .doc
			"application/vnd.openxmlformats-officedocument.wordprocessingml.document", // .docx
			"application/vnd.ms-excel", // .xls
			"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",         // .xlsx
			"application/vnd.ms-powerpoint",                                             // .ppt
			"application/vnd.openxmlformats-officedocument.presentationml.presentation", // .pptx
			// Text
			"text/plain",
			// Archives
			"application/zip",
			"application/x-zip-compressed",
			"application/x-rar-compressed",
			"application/vnd.rar",
		},

		// Email settings
		SMTPHost:       getEnv("SMTP_HOST", "smtp.example.com"),
		SMTPPort:       getEnvAsInt("SMTP_PORT", 587),
		SMTPUser:       getEnv("SMTP_USER", ""),
		SMTPPassword:   getEnv("SMTP_PASSWORD", ""),
		SMTPFrom:       getEnv("SMTP_FROM", "noreply@fotbal-club.cz"),
		SMTPFromName:   getEnv("SMTP_FROM_NAME", "Fotbal Club"),
		SMTPEncryption: getEnv("SMTP_ENCRYPTION", "tls"),
		SMTPAuth:       getEnvAsBool("SMTP_AUTH", true),
		SMTPSkipVerify: getEnvAsBool("SMTP_SKIP_VERIFY", false),

		// Email templates - using absolute path to templates
		EmailTemplateDir: getEnv("EMAIL_TEMPLATE_DIR", filepath.Join("templates", "emails")),

		// Contact settings
		ContactEmail:     getEnv("CONTACT_EMAIL", "help@tdvorak.dev"),
		AdminEmail:       getEnv("ADMIN_EMAIL", "help@tdvorak.dev"),
		AdminAccessToken: getEnv("ADMIN_ACCESS_TOKEN", ""),

		// Newsletter settings
		NewsletterEnabled: getEnvAsBool("NEWSLETTER_ENABLED", true),

		// CORS settings
		AllowedOrigins: []string{
			"http://localhost:3000",
			"http://localhost:8080",
		},

		// External services
		ScraperBaseURL:   getEnv("FACR_SCRAPER_BASE_URL", "http://localhost:8081"),
		FrontendBaseURL:  getEnv("FRONTEND_BASE_URL", "http://localhost:3000"),
		PublicAPIBaseURL: getEnv("PUBLIC_API_BASE_URL", "http://localhost:8080/api/v1"),
		ZoneramaAPIBase:  getEnv("ZONERAMA_API_BASE", "https://zonerama.tdvorak.dev"),

		// Umami Analytics
		UmamiURL:       getEnv("UMAMI_URL", ""),
		UmamiUsername:  getEnv("UMAMI_USERNAME", ""),
		UmamiPassword:  getEnv("UMAMI_PASSWORD", ""),
		UmamiWebsiteID: getEnv("UMAMI_WEBSITE_ID", ""),

		ErrorIngestURL:   getEnv("ERROR_INGEST_URL", ""),
		ErrorIngestToken: getEnv("ERROR_INGEST_TOKEN", ""),

		// Antivirus (optional)
		ClamAVEnabled: getEnvAsBool("CLAMAV_ENABLED", false),
		ClamAVHost:    getEnv("CLAMAV_HOST", "127.0.0.1"),
		ClamAVPort:    getEnvAsInt("CLAMAV_PORT", 3310),

		// Feature flags
		RembgEnabled: getEnvAsBool("REMBG_ENABLED", true),
		// Club data mode: auto (FACR integration) or manual (no FACR/http scraping)
		ClubDataMode: strings.ToLower(strings.TrimSpace(getEnv("CLUB_DATA_MODE", "auto"))),

		// E-shop settings
		EshopEnabled:     getEnvAsBool("ESHOP_ENABLED", false),
		EshopFrontendURL: getEnv("ESHOP_FRONTEND_URL", ""),
		EshopAPIURL:      getEnv("ESHOP_API_URL", ""),

		// Stripe (E-shop payments)
		StripeEnabled:        getEnvAsBool("STRIPE_ENABLED", false),
		StripeSecretKey:      getEnv("STRIPE_SECRET_KEY", ""),
		StripePublishableKey: getEnv("STRIPE_PUBLISHABLE_KEY", ""),
		StripeWebhookSecret:  getEnv("STRIPE_WEBHOOK_SECRET", ""),
		StripeCurrency:       getEnv("STRIPE_CURRENCY", "CZK"),
		StripeReturnURL:      getEnv("STRIPE_RETURN_URL", ""),

		// Revolut (E-shop payments)
		RevolutEnabled:       getEnvAsBool("REVOLUT_ENABLED", false),
		RevolutEnvironment:   getEnv("REVOLUT_ENVIRONMENT", "sandbox"),
		RevolutAPIKey:        getEnv("REVOLUT_API_KEY", ""),
		RevolutPublicKey:     getEnv("REVOLUT_PUBLIC_KEY", ""),
		RevolutWebhookSecret: getEnv("REVOLUT_WEBHOOK_SECRET", ""),
		RevolutReturnURL:     getEnv("REVOLUT_RETURN_URL", ""),
		RevolutWebhookURL:    getEnv("REVOLUT_WEBHOOK_URL", ""),

		// Packeta / Zasilkovna
		PacketaAPIPassword:  getEnv("PACKETA_API_PASSWORD", ""),
		PacketaWidgetAPIKey: getEnv("PACKETA_WIDGET_API_KEY", ""),
		PacketaEshopName:    getEnv("PACKETA_ESHP_NAME", "MyClubEshop"),
		PacketaEnv:          getEnv("PACKETA_ENV", "test"),

		// DeepSeek AI Support (used by e-shop support chat)
		DeepSeekAPIKey:  getEnv("DEEPSEEK_API_KEY", ""),
		DeepSeekBaseURL: getEnv("DEEPSEEK_BASE_URL", "https://api.deepseek.com"),
	}

	// Override allowed origins if specified in environment (comma-separated)
	if origins := os.Getenv("ALLOWED_ORIGINS"); origins != "" {
		parts := strings.Split(origins, ",")
		var list []string
		for _, p := range parts {
			v := strings.TrimSpace(p)
			if v != "" {
				list = append(list, v)
			}
		}
		if len(list) > 0 {
			AppConfig.AllowedOrigins = list
		}
	}
}

func getEnv(key, defaultValue string) string {
	value := os.Getenv(key)
	if value == "" {
		return defaultValue
	}
	return value
}

func getEnvAsInt(key string, defaultValue int) int {
	valueStr := os.Getenv(key)
	if valueStr == "" {
		return defaultValue
	}

	value, err := strconv.Atoi(valueStr)
	if err != nil {
		log.Printf("Invalid value for %s: %v. Using default: %d", key, err, defaultValue)
		return defaultValue
	}

	return value
}

func getEnvAsBool(key string, defaultValue bool) bool {
	valueStr := os.Getenv(key)
	if valueStr == "" {
		return defaultValue
	}

	value, err := strconv.ParseBool(valueStr)
	if err != nil {
		log.Printf("Invalid boolean value for %s: %v. Using default: %t", key, err, defaultValue)
		return defaultValue
	}

	return value
}