package aeusadmin

import (
	"context"
	"path"

	"git.nobla.cn/golang/aeus-admin/defaults"
	"git.nobla.cn/golang/aeus-admin/models"
	"git.nobla.cn/golang/aeus/pkg/errors"
	"git.nobla.cn/golang/rest"
	"git.nobla.cn/golang/rest/inflector"
	"git.nobla.cn/golang/rest/types"
	"gorm.io/gorm"
)

// getModels 获取预定义的模型列表
func getModels() []any {
	return []any{
		&models.User{},
		&models.Role{},
		&models.Menu{},
		&models.Department{},
		&models.Permission{},
		&models.RolePermission{},
	}
}

// checkModelMenu 检查模型菜单
func checkModelMenu(db *gorm.DB, viewPath string, model *rest.Model, translate Translate) (value *models.Menu, err error) {
	menuName := inflector.Camelize(model.Naming().ModuleName) + inflector.Camelize(model.Naming().Singular)
	value = &models.Menu{}
	if err = db.Where("name = ?", menuName).First(value).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			value.Name = menuName
			value.ParentId = 0
			value.ViewPath = path.Join(viewPath, model.ModuleName(), model.Naming().Singular, "Index.vue")
			value.Label = inflector.Camel2words(model.Naming().Pluralize)
			if translate != nil {
				value.Label = translate.Menu(model, value.Label)
			}
			value.Uri = model.Uri(types.ScenarioList)
			err = db.Create(value).Error
		}
	}
	return
}

// checkModelPermission  检查模型权限是否写入到数据库
func checkModelPermission(db *gorm.DB, menuId int64, scene string, model *rest.Model, translate Translate) (permissionModel *models.Permission, err error) {
	permissionModel = &models.Permission{}
	permission := model.Permission(scene)
	if err = db.Where("permission = ?", permission).First(permissionModel).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			permissionModel.MenuId = menuId
			permissionModel.Label = scene
			if translate != nil {
				permissionModel.Label = translate.Permission(model, scene, permissionModel.Label)
			}
			permissionModel.Permission = permission
			err = db.Create(permissionModel).Error
		}
	}
	return
}

// checkModel 检查模型
func checkModel(opts *options, model *rest.Model) (err error) {
	var (
		menuModel *models.Menu
	)
	tx := opts.db.Begin()
	if menuModel, err = checkModelMenu(tx, opts.viewPath, model, opts.translate); err != nil {
		tx.Rollback()
		return
	}
	for _, s := range defaultScenarios {
		if model.HasScenario(s) {
			if _, err = checkModelPermission(tx, menuModel.Id, s, model, opts.translate); err != nil {
				tx.Rollback()
				return
			}
		}
	}
	tx.Commit()
	return
}

// initREST 初始化REST模块
func initREST(ctx context.Context, o *options) (err error) {
	tx := o.db
	if tx == nil {
		return errors.ErrUnavailable
	}
	opts := make([]rest.Option, 0)
	opts = append(opts, o.restOpts...)
	opts = append(opts, rest.WithDB(tx))
	if err = rest.Init(opts...); err != nil {
		return
	}
	if err = tx.AutoMigrate(getModels()...); err != nil {
		return
	}
	return
}

// initRBAC 初始化权限控制, 用于生成角色权限相关的信息
func initRBAC(ctx context.Context, o *options) (err error) {
	var mv *rest.Model
	for _, v := range getModels() {
		if mv, err = rest.AutoMigrate(ctx, v); err != nil {
			return
		} else {
			if err = checkModel(o, mv); err != nil {
				return
			}
		}
	}
	return
}

// AutoMigrate 自动生成一个模型的schema和权限的定义
func AutoMigrate(ctx context.Context, db *gorm.DB, model any, cbs ...Option) (err error) {
	var (
		mv *rest.Model
	)
	opts := newOptions(cbs...)
	if mv, err = rest.AutoMigrate(ctx, model); err != nil {
		return
	}
	err = checkModel(opts, mv)
	return
}

// Init 初始化模块
func Init(ctx context.Context, cbs ...Option) (err error) {
	opts := newOptions(cbs...)
	if err = initREST(ctx, opts); err != nil {
		return
	}
	if err = initRBAC(ctx, opts); err != nil {
		return
	}
	err = defaults.Init(opts.db)
	return
}