// Command migrate 是独立的数据库结构迁移入口：手动执行，服务启动不会触发迁移。
//
// 用法：
//
//	go run ./cmd/migrate up             # 执行到最新版本
//	go run ./cmd/migrate down           # 全量回滚
//	go run ./cmd/migrate steps 2        # 向上 2 步（负数向下）
//	go run ./cmd/migrate version        # 查看当前版本与脏库状态
//	go run ./cmd/migrate force 3        # 修复脏库：强制设置版本号
package main

import (
	"fmt"
	"os"
	"strconv"

	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/pkg/migration"
	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/pkg/setting"
)

const usage = `用法:
  go run ./cmd/migrate up         执行到最新版本
  go run ./cmd/migrate down       全量回滚所有迁移
  go run ./cmd/migrate steps N    向上 N 步（N 为负数时向下）
  go run ./cmd/migrate version    查看当前版本与脏库状态
  go run ./cmd/migrate force V    强制设置版本号并清除脏标记`

func main() {
	if err := run(os.Args[1:]); err != nil {
		fmt.Fprintf(os.Stderr, "migrate failed: %v\n", err)
		os.Exit(1)
	}
}

func run(args []string) error {
	if len(args) == 0 {
		fmt.Println(usage)
		return nil
	}

	// 仅读取 Mysql 配置段，不复用 main.go 的 setupSetting（后者会强制校验 JWT 等无关配置）。
	mysqlSetting, err := loadMysqlSetting()
	if err != nil {
		return err
	}

	switch args[0] {
	case "up":
		if err := migration.Up(mysqlSetting); err != nil {
			return err
		}
		fmt.Println("migrate up: done")
		return nil

	case "down":
		if err := migration.Down(mysqlSetting); err != nil {
			return err
		}
		fmt.Println("migrate down: done")
		return nil

	case "steps":
		if len(args) < 2 {
			return fmt.Errorf("steps 缺少步数参数\n%s", usage)
		}
		n, err := strconv.Atoi(args[1])
		if err != nil {
			return fmt.Errorf("steps 参数必须为整数: %w", err)
		}
		if err := migration.Steps(mysqlSetting, n); err != nil {
			return err
		}
		fmt.Printf("migrate steps %d: done\n", n)
		return nil

	case "version":
		version, dirty, err := migration.Version(mysqlSetting)
		if err != nil {
			return err
		}
		fmt.Printf("version: %d, dirty: %t\n", version, dirty)
		return nil

	case "force":
		if len(args) < 2 {
			return fmt.Errorf("force 缺少版本号参数\n%s", usage)
		}
		v, err := strconv.Atoi(args[1])
		if err != nil {
			return fmt.Errorf("force 参数必须为整数: %w", err)
		}
		if err := migration.Force(mysqlSetting, v); err != nil {
			return err
		}
		fmt.Printf("migrate force %d: done\n", v)
		return nil

	default:
		return fmt.Errorf("unknown command: %s\n%s", args[0], usage)
	}
}

// loadMysqlSetting 读取 configs/config.yaml 的 Mysql 配置段。
func loadMysqlSetting() (*setting.MysqlSettingS, error) {
	s, err := setting.NewSetting()
	if err != nil {
		return nil, fmt.Errorf("read config: %w", err)
	}

	var mysqlSetting setting.MysqlSettingS
	if err := s.ReadSection("Mysql", &mysqlSetting); err != nil {
		return nil, fmt.Errorf("read Mysql section: %w", err)
	}
	if mysqlSetting.DBName == "" {
		return nil, fmt.Errorf("Mysql.DBName is empty in configs/config.yaml")
	}
	return &mysqlSetting, nil
}