package main

import (
	"context"
	"io/fs"
	"log"
	"net/http"
	"os"

	"nestly/internal/auth"
	"nestly/internal/handlers"
	"nestly/internal/models"
	"nestly/internal/storage"
	"nestly/internal/templates"
	"nestly/web"
)

const demoEmail = "demo@nestly.test"

func envOr(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}

func main() {
	port := envOr("PORT", "3000")
	dsn := envOr("DB_DSN", "nestly.db")
	secret := os.Getenv("SESSION_SECRET")
	if secret == "" {
		secret = "nestly-dev-secret"
		log.Println("警告：未設定 SESSION_SECRET，使用開發用預設值，正式環境務必指定")
	}

	ctx := context.Background()
	db, err := storage.Open(dsn)
	if err != nil {
		log.Fatal(err)
	}
	accounts := models.NewAccountStore(db)
	if err := accounts.AutoMigrate(ctx); err != nil {
		log.Fatal(err)
	}
	seedDemoAccount(ctx, accounts)

	templateFS, err := fs.Sub(web.TemplatesFS, "templates")
	if err != nil {
		log.Fatal(err)
	}
	engine, err := templates.New(templateFS)
	if err != nil {
		log.Fatal(err)
	}

	router := handlers.NewRouter(handlers.Dependencies{
		Templates: engine,
		Accounts:  accounts,
		Sessions:  auth.NewSessionManager(secret, os.Getenv("COOKIE_SECURE") == "true"),
	})

	log.Printf("Nestly 啟動於 http://localhost:%s", port)
	if err := http.ListenAndServe(":"+port, router); err != nil {
		log.Fatal(err)
	}
}

// seedDemoAccount 於資料庫無此帳號時建立示範帳號，方便本地試用登入流程。
func seedDemoAccount(ctx context.Context, accounts *models.AccountStore) {
	if _, err := accounts.FindByEmail(ctx, demoEmail); err == nil {
		return
	} else if err != models.ErrNotFound {
		log.Fatal(err)
	}
	acct := &models.Account{Email: demoEmail, Name: "示範帳號", Role: models.RoleMember}
	if err := acct.SetPassword("nestly1234"); err != nil {
		log.Fatal(err)
	}
	if err := accounts.Create(ctx, acct); err != nil {
		log.Fatal(err)
	}
	log.Printf("已建立示範帳號 %s（密碼：nestly1234）", demoEmail)
}