package reports

import (
	"context"
	"errors"
	"strings"
	"testing"
	"time"

	"bookra/apps/backend/internal/bookings"
	"bookra/apps/backend/internal/db"
	"bookra/apps/backend/internal/notifications"
)

func newTestService(repo db.Repository) *Service {
	return NewService(repo, bookings.NewService(repo, nil, "http://localhost:3000"), "http://localhost:3000", "noreply@bookra.dev")
}

func TestDispatchDigestsSendsLocalizedSummary(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newTestService(repo)
	ctx := context.Background()
	tenantID := "5d6b3551-0a3e-4b86-bdf0-e9df20a47148"
	serviceID := "d5d76a61-3d49-467c-8dd4-bf61ee754e39"

	_, err := repo.CreateBooking(ctx, db.CreateBookingParams{
		TenantID:      tenantID,
		ServiceID:     &serviceID,
		BookingMode:   "appointment",
		CustomerName:  "Klára",
		CustomerEmail: "klara@example.com",
		StartsAt:      time.Now().UTC().Add(-26 * time.Hour),
		EndsAt:        time.Now().UTC().Add(-25 * time.Hour),
		Status:        "confirmed",
		Reference:     "BK-DIG-1",
	})
	if err != nil {
		t.Fatalf("seed booking: %v", err)
	}

	var sent []notifications.EmailMessage
	capture := func(_ context.Context, msg notifications.EmailMessage) error {
		sent = append(sent, msg)
		return nil
	}

	response, err := svc.DispatchDigests(ctx, 7, tenantID, capture)
	if err != nil {
		t.Fatalf("dispatch: %v", err)
	}
	if response.TenantCount != 1 || response.SentCount != 1 {
		t.Fatalf("expected 1 tenant / 1 sent, got %+v", response)
	}
	if len(sent) != 1 {
		t.Fatalf("expected 1 email, got %d", len(sent))
	}
	msg := sent[0]
	if msg.To != "owner@bookra.dev" || msg.From != "noreply@bookra.dev" {
		t.Fatalf("bad addressing: %+v", msg)
	}
	// Demo tenant locale is cs — subject should be the Czech digest.
	if !strings.Contains(msg.Subject, "přehled") {
		t.Fatalf("expected Czech subject, got %q", msg.Subject)
	}
	if !strings.Contains(msg.Text, "Rezervace celkem") || !strings.Contains(msg.Text, "1200 Kč") {
		t.Fatalf("digest body missing totals: %q", msg.Text)
	}
	if !strings.Contains(msg.Text, "Signature treatment") {
		t.Fatalf("digest body missing service line: %q", msg.Text)
	}
}

func TestDispatchDigestsSkipsZeroActivityTenant(t *testing.T) {
	// NewMemoryRepository seeds the tenant, staff, and services but no
	// bookings — the trailing window is empty, so the digest must skip.
	repo := db.NewMemoryRepository()
	svc := newTestService(repo)
	calls := 0
	response, err := svc.DispatchDigests(context.Background(), 7, "", func(context.Context, notifications.EmailMessage) error {
		calls++
		return nil
	})
	if err != nil {
		t.Fatalf("dispatch: %v", err)
	}
	if response.TenantCount != 1 || response.SkippedCount != 1 || calls != 0 {
		t.Fatalf("expected 1 skipped tenant and no sends, got %+v (calls=%d)", response, calls)
	}
}

func TestDispatchDigestsCountsSendFailures(t *testing.T) {
	repo := db.NewMemoryRepository()
	svc := newTestService(repo)
	ctx := context.Background()
	tenantID := "5d6b3551-0a3e-4b86-bdf0-e9df20a47148"
	serviceID := "d5d76a61-3d49-467c-8dd4-bf61ee754e39"

	if _, err := repo.CreateBooking(ctx, db.CreateBookingParams{
		TenantID:      tenantID,
		ServiceID:     &serviceID,
		BookingMode:   "appointment",
		CustomerName:  "Klára",
		CustomerEmail: "klara@example.com",
		StartsAt:      time.Now().UTC().Add(-2 * time.Hour),
		EndsAt:        time.Now().UTC().Add(-time.Hour),
		Status:        "confirmed",
		Reference:     "BK-DIG-2",
	}); err != nil {
		t.Fatalf("seed booking: %v", err)
	}

	response, err := svc.DispatchDigests(ctx, 7, tenantID, func(context.Context, notifications.EmailMessage) error {
		return errors.New("smtp down")
	})
	if err != nil {
		t.Fatalf("dispatch: %v", err)
	}
	if response.FailedCount != 1 || response.SentCount != 0 {
		t.Fatalf("expected 1 failed send, got %+v", response)
	}
}