package system

import (
	"context"

	. "git.echol.cn/loser/Go-Web-Template/server/model/system"
	"git.echol.cn/loser/Go-Web-Template/server/service/system"
	"github.com/pkg/errors"
	"gorm.io/gorm"
)

// 该 initializer 用于把「菜单 DB 数据」与「前端文件路由」对齐：
// - 按 Name 精准匹配，幂等修正 path/parent/component，避免出现“前端显示与实际路由不一致”的别名情况。
// - 若缺少必要父级/子级菜单，则补齐到目标结构。
//
// 注意：它不会删除菜单，只做修正/补齐，避免误伤线上已有配置。

const initOrderMenuRepair = initOrderMenu + 1

type menuRepair struct{}

func init() {
	system.RegisterInit(initOrderMenuRepair, &menuRepair{})
}

func (m *menuRepair) InitializerName() string {
	return "sys_base_menus_repair"
}

func (m *menuRepair) MigrateTable(ctx context.Context) (context.Context, error) {
	// 仅修复数据，不建表
	return ctx, nil
}

func (m *menuRepair) TableCreated(ctx context.Context) bool {
	// 仅修复数据，不参与建表逻辑
	return true
}

func (m *menuRepair) DataInserted(ctx context.Context) bool {
	// 每次都允许运行（幂等修复），因此返回 false 以触发 InitializeData
	return false
}

type menuSeed struct {
	level      uint
	hidden     bool
	parentName string // 空表示根节点
	path       string
	name       string
	component  string
	sort       int
	title      string
	icon       string
}

func ensureMenu(tx *gorm.DB, seed menuSeed, parentID uint) (*SysBaseMenu, error) {
	var menu SysBaseMenu
	err := tx.Where("name = ?", seed.name).First(&menu).Error
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, err
	}

	if errors.Is(err, gorm.ErrRecordNotFound) {
		menu = SysBaseMenu{
			MenuLevel: seed.level,
			ParentId:  parentID,
			Path:      seed.path,
			Name:      seed.name,
			Hidden:    seed.hidden,
			Component: seed.component,
			Sort:      seed.sort,
			Meta: Meta{
				Title: seed.title,
				Icon:  seed.icon,
			},
		}
		if err := tx.Create(&menu).Error; err != nil {
			return nil, err
		}
		return &menu, nil
	}

	updates := map[string]any{
		"menu_level": seed.level,
		"parent_id":  parentID,
		"path":       seed.path,
		"component":  seed.component,
	}
	if err := tx.Model(&menu).Updates(updates).Error; err != nil {
		return nil, err
	}

	// 尽量不覆盖用户自定义标题/图标：仅在为空时补齐
	metaUpdates := map[string]any{}
	if menu.Meta.Title == "" && seed.title != "" {
		metaUpdates["title"] = seed.title
	}
	if menu.Meta.Icon == "" && seed.icon != "" {
		metaUpdates["icon"] = seed.icon
	}
	if len(metaUpdates) > 0 {
		if err := tx.Model(&menu).Updates(metaUpdates).Error; err != nil {
			return nil, err
		}
	}

	return &menu, nil
}

func (m *menuRepair) InitializeData(ctx context.Context) (next context.Context, err error) {
	db, ok := ctx.Value("db").(*gorm.DB)
	if !ok {
		return ctx, system.ErrMissingDBContext
	}

	seeds := []menuSeed{
		// 父级（若不存在则补齐）
		{
			level:     0,
			hidden:    false,
			path:      "userCenter",
			name:      "userCenter",
			component: "features/discovery/ModuleLandingPage:userCenter",
			sort:      2,
			title:     "用户中心",
			icon:      "AppstoreOutlined",
		},
		{
			level:     0,
			hidden:    false,
			path:      "opsConfig",
			name:      "opsConfig",
			component: "features/discovery/ModuleLandingPage:opsConfig",
			sort:      6,
			title:     "运营配置",
			icon:      "SettingOutlined",
		},
		{
			level:     0,
			hidden:    false,
			path:      "common",
			name:      "common",
			component: "features/discovery/ModuleLandingPage:common",
			sort:      6,
			title:     "公共能力",
			icon:      "AppstoreOutlined",
		},

		// 子级（目标规范路径）
		{
			level:      1,
			hidden:     false,
			parentName: "userCenter",
			path:       "appLoginLog",
			name:       "appLoginLog",
			component:  "features/appLoginLogs/AppLoginLogsPage",
			sort:       99,
			title:      "登录日志",
			icon:       "FileTextOutlined",
		},
		{
			level:      1,
			hidden:     false,
			parentName: "opsConfig",
			path:       "sysParamChangeLog",
			name:       "sysParamChangeLog",
			component:  "features/params/SysParamChangeLogPage",
			sort:       99,
			title:      "参数变更日志",
			icon:       "SettingOutlined",
		},
		{
			level:      1,
			hidden:     false,
			parentName: "common",
			path:       "upload",
			name:       "upload",
			component:  "features/media/MediaLibraryPage",
			sort:       1,
			title:      "媒体库（上传下载）",
			icon:       "UploadOutlined",
		},
	}

	err = db.Transaction(func(tx *gorm.DB) error {
		byName := map[string]*SysBaseMenu{}

		// 先确保父级存在（包含 common 也一起修正 component/path）
		for _, seed := range seeds {
			if seed.level != 0 {
				continue
			}
			menu, err := ensureMenu(tx, seed, 0)
			if err != nil {
				return errors.Wrap(err, "ensure parent menu failed")
			}
			byName[seed.name] = menu
		}

		// 再确保子级存在并挂载到父级
		for _, seed := range seeds {
			if seed.level == 0 {
				continue
			}
			parent := byName[seed.parentName]
			if parent == nil {
				return errors.Errorf("missing parent menu %s for %s", seed.parentName, seed.name)
			}
			if _, err := ensureMenu(tx, seed, parent.ID); err != nil {
				return errors.Wrap(err, "ensure child menu failed")
			}
		}

		return nil
	})
	if err != nil {
		return ctx, err
	}

	return ctx, nil
}