package main

import (
	"flag"
	"fmt"
	"log"
	"os"

	"photography-backend/internal/config"
	"photography-backend/pkg/migration"
	"photography-backend/pkg/utils/database"

	"github.com/zeromicro/go-zero/core/conf"
)

func main() {
	// 命令行参数
	var (
		configFile = flag.String("f", "/etc/photography-api.yaml", "配置文件路径")
		command    = flag.String("c", "status", "迁移命令: up, down, status, reset, migrate")
		steps      = flag.Int("s", 0, "步数（用于 down 和 migrate 命令）")
		version    = flag.String("v", "", "迁移版本（用于特定版本操作）")
		help       = flag.Bool("h", false, "显示帮助信息")
	)
	flag.Parse()

	// 显示帮助信息
	if *help {
		showHelp()
		return
	}

	// 加载配置
	var c config.Config
	conf.MustLoad(*configFile, &c)

	// 创建数据库连接
	db, err := database.NewDB(c.Database)
	if err != nil {
		log.Fatalf("Failed to connect to database: %v", err)
	}

	// 创建迁移器
	migrator := migration.NewMigrator(db)

	// 加载所有迁移
	migrations := migration.GetAllMigrations()
	for _, m := range migrations {
		migrator.AddMigration(m)
	}

	// 执行命令
	switch *command {
	case "up":
		if err := migrator.Up(); err != nil {
			log.Fatalf("Migration up failed: %v", err)
		}
		fmt.Println("All migrations applied successfully!")

	case "down":
		if *steps <= 0 {
			fmt.Println("Please specify the number of steps to rollback with -s flag")
			os.Exit(1)
		}
		if err := migrator.Down(*steps); err != nil {
			log.Fatalf("Migration down failed: %v", err)
		}
		fmt.Printf("Successfully rolled back %d migrations\n", *steps)

	case "status":
		if err := migrator.Status(); err != nil {
			log.Fatalf("Failed to get migration status: %v", err)
		}

	case "reset":
		fmt.Print("Are you sure you want to reset the database? This will DROP ALL TABLES! (y/N): ")
		var response string
		fmt.Scanln(&response)
		if response == "y" || response == "Y" {
			if err := migrator.Reset(); err != nil {
				log.Fatalf("Database reset failed: %v", err)
			}
			fmt.Println("Database reset successfully!")
		} else {
			fmt.Println("Database reset cancelled.")
		}

	case "migrate":
		migrateSteps := *steps
		if migrateSteps <= 0 {
			// 如果没有指定步数，默认执行所有待处理迁移
			pendingMigrations, err := migrator.GetPendingMigrations()
			if err != nil {
				log.Fatalf("Failed to get pending migrations: %v", err)
			}
			migrateSteps = len(pendingMigrations)
		}

		if err := migrator.Migrate(migrateSteps); err != nil {
			log.Fatalf("Migration failed: %v", err)
		}
		fmt.Printf("Successfully applied %d migrations\n", migrateSteps)

	case "version":
		if *version != "" {
			migration := migration.GetMigrationByVersion(*version)
			if migration == nil {
				fmt.Printf("Migration version %s not found\n", *version)
				os.Exit(1)
			}
			fmt.Printf("Version: %s\n", migration.Version)
			fmt.Printf("Description: %s\n", migration.Description)
			fmt.Printf("Timestamp: %s\n", migration.Timestamp.Format("2006-01-02 15:04:05"))
		} else {
			latest := migration.GetLatestMigrationVersion()
			if latest == "" {
				fmt.Println("No migrations found")
			} else {
				fmt.Printf("Latest migration version: %s\n", latest)
			}
		}

	case "create":
		if len(flag.Args()) < 1 {
			fmt.Println("Please provide a migration name: go run cmd/migrate/main.go -c create \"migration_name\"")
			os.Exit(1)
		}
		migrationName := flag.Args()[0]
		createMigrationTemplate(migrationName)

	default:
		fmt.Printf("Unknown command: %s\n", *command)
		showHelp()
		os.Exit(1)
	}
}

func showHelp() {
	fmt.Println("数据库迁移工具使用说明:")
	fmt.Println()
	fmt.Println("命令格式:")
	fmt.Println("  go run cmd/migrate/main.go [选项] [参数]")
	fmt.Println()
	fmt.Println("选项:")
	fmt.Println("  -f string    配置文件路径 (默认: /etc/photography-api.yaml)")
	fmt.Println("  -c string    迁移命令 (默认: status)")
	fmt.Println("  -s int       步数，用于 down 和 migrate 命令")
	fmt.Println("  -v string    迁移版本，用于特定版本操作")
	fmt.Println("  -h          显示帮助信息")
	fmt.Println()
	fmt.Println("命令:")
	fmt.Println("  status       显示所有迁移的状态")
	fmt.Println("  up           应用所有待处理的迁移")
	fmt.Println("  down         回滚指定数量的迁移 (需要 -s 参数)")
	fmt.Println("  migrate      应用指定数量的迁移 (可选 -s 参数)")
	fmt.Println("  reset        重置数据库 (删除所有表)")
	fmt.Println("  version      显示最新迁移版本 (可选 -v 查看特定版本)")
	fmt.Println("  create       创建新的迁移模板")
	fmt.Println()
	fmt.Println("示例:")
	fmt.Println("  go run cmd/migrate/main.go -c status")
	fmt.Println("  go run cmd/migrate/main.go -c up")
	fmt.Println("  go run cmd/migrate/main.go -c down -s 1")
	fmt.Println("  go run cmd/migrate/main.go -c migrate -s 2")
	fmt.Println("  go run cmd/migrate/main.go -c version")
	fmt.Println("  go run cmd/migrate/main.go -c create \"add_user_avatar_field\"")
}

func createMigrationTemplate(name string) {
	// 生成版本号（基于当前时间）
	version := fmt.Sprintf("%d_%06d",
		getCurrentTimestamp(),
		getCurrentMicroseconds())

	template := fmt.Sprintf(`// Migration: %s
// Description: %s
// Version: %s

package migration

import "time"

// Add this migration to GetAllMigrations() in migrations.go
var migration_%s = Migration{
	Version:     "%s",
	Description: "%s",
	Timestamp:   time.Now(),
	UpSQL: %s
-- Add your UP migration SQL here
-- Example:
-- ALTER TABLE user ADD COLUMN new_field VARCHAR(255) DEFAULT '';
-- CREATE INDEX IF NOT EXISTS idx_user_new_field ON user(new_field);
%s,
	DownSQL: %s
-- Add your DOWN migration SQL here (rollback changes)
-- Example:
-- DROP INDEX IF EXISTS idx_user_new_field;
-- ALTER TABLE user DROP COLUMN new_field; -- Note: SQLite doesn't support DROP COLUMN
%s,
}`,
		name, name, version,
		version, version, name,
		"`", "`", "`", "`")

	filename := fmt.Sprintf("migrations/%s_%s.go", version, name)

	// 创建 migrations 目录
	if err := os.MkdirAll("migrations", 0755); err != nil {
		log.Fatalf("Failed to create migrations directory: %v", err)
	}

	// 写入模板文件
	if err := os.WriteFile(filename, []byte(template), 0644); err != nil {
		log.Fatalf("Failed to create migration template: %v", err)
	}

	fmt.Printf("Created migration template: %s\n", filename)
	fmt.Println("Please:")
	fmt.Println("1. Edit the migration file to add your SQL")
	fmt.Println("2. Add the migration to GetAllMigrations() in pkg/migration/migrations.go")
	fmt.Println("3. Run 'go run cmd/migrate/main.go -c status' to verify")
}

func getCurrentTimestamp() int64 {
	return 20250711000000 // 格式: YYYYMMDDHHMMSS，可以根据需要调整
}

func getCurrentMicroseconds() int {
	return 1 // 当天的迁移计数，可以根据需要调整
}