package admin

import (
	"context"
	"errors"
	"github.com/duke-git/lancet/v2/convertor"
	v1 "github.com/go-nunu/nunu-layout-advanced/api/v1"
	"github.com/go-nunu/nunu-layout-advanced/internal/model"
	"github.com/go-nunu/nunu-layout-advanced/internal/repository/admin"
	"github.com/go-nunu/nunu-layout-advanced/internal/service"
	"go.uber.org/zap"
	"golang.org/x/crypto/bcrypt"
	"gorm.io/gorm"
	"sort"

	"strings"
	"time"
)

type AdminService interface {
	Login(ctx context.Context, req *v1.LoginRequest) (string, error)
	GetAdminUsers(ctx context.Context, req *v1.GetAdminUsersRequest) (*v1.GetAdminUsersResponseData, error)
	GetAdminUser(ctx context.Context, uid uint) (*v1.GetAdminUserResponseData, error)
	AdminUserUpdate(ctx context.Context, req *v1.AdminUserUpdateRequest) error
	AdminUserCreate(ctx context.Context, req *v1.AdminUserCreateRequest) error
	AdminUserDelete(ctx context.Context, id uint) error

	GetUserPermissions(ctx context.Context, uid uint) (*v1.GetUserPermissionsData, error)
	GetRolePermissions(ctx context.Context, role string) (*v1.GetRolePermissionsData, error)
	UpdateRolePermission(ctx context.Context, req *v1.UpdateRolePermissionRequest) error

	GetAdminMenus(ctx context.Context) (*v1.GetMenuResponseData, error)
	GetMenus(ctx context.Context, uid uint) (*v1.GetMenuResponseData, error)
	MenuUpdate(ctx context.Context, req *v1.MenuUpdateRequest) error
	MenuCreate(ctx context.Context, req *v1.MenuCreateRequest) error
	MenuDelete(ctx context.Context, id uint) error

	GetRoles(ctx context.Context, req *v1.GetRoleListRequest) (*v1.GetRolesResponseData, error)
	RoleUpdate(ctx context.Context, req *v1.RoleUpdateRequest) error
	RoleCreate(ctx context.Context, req *v1.RoleCreateRequest) error
	RoleDelete(ctx context.Context, id uint) error

	GetApis(ctx context.Context, req *v1.GetApisRequest) (*v1.GetApisResponseData, error)
	ApiUpdate(ctx context.Context, req *v1.ApiUpdateRequest) error
	ApiCreate(ctx context.Context, req *v1.ApiCreateRequest) error
	ApiDelete(ctx context.Context, id uint) error
}

func NewAdminService(
	service *service.Service,
	adminRepository admin.AdminRepository,
) AdminService {
	return &adminService{
		Service:         service,
		adminRepository: adminRepository,
	}
}

type adminService struct {
	*service.Service
	adminRepository admin.AdminRepository
}

func (s *adminService) GetAdminUser(ctx context.Context, uid uint) (*v1.GetAdminUserResponseData, error) {
	user, err := s.adminRepository.GetAdminUser(ctx, uid)
	if err != nil {
		return nil, err
	}
	roles, _ := s.adminRepository.GetUserRoles(ctx, uid)

	return &v1.GetAdminUserResponseData{
		Email:     user.Email,
		ID:        user.ID,
		Username:  user.Username,
		Nickname:  user.Nickname,
		Phone:     user.Phone,
		Roles:     roles,
		CreatedAt: user.CreatedAt.Format("2006-01-02 15:04:05"),
		UpdatedAt: user.UpdatedAt.Format("2006-01-02 15:04:05"),
	}, nil
}

func (s *adminService) Login(ctx context.Context, req *v1.LoginRequest) (string, error) {
	user, err := s.adminRepository.GetAdminUserByUsername(ctx, req.Username)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return "", v1.ErrUnauthorized
		}
		return "", v1.ErrInternalServerError
	}

	err = bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(req.Password))
	if err != nil {
		return "", err
	}
	token, err := s.Jwt.GenToken(user.ID, time.Now().Add(time.Hour*24*1))
	if err != nil {
		return "", err
	}

	return token, nil
}

func (s *adminService) GetAdminUsers(ctx context.Context, req *v1.GetAdminUsersRequest) (*v1.GetAdminUsersResponseData, error) {
	list, total, err := s.adminRepository.GetAdminUsers(ctx, req)
	if err != nil {
		return nil, err
	}
	data := &v1.GetAdminUsersResponseData{
		List:  make([]v1.AdminUserDataItem, 0),
		Total: total,
	}
	for _, user := range list {
		roles, err := s.adminRepository.GetUserRoles(ctx, user.ID)
		if err != nil {
			s.Logger.Error("GetUserRoles error", zap.Error(err))
			continue
		}
		data.List = append(data.List, v1.AdminUserDataItem{
			Email:     user.Email,
			ID:        user.ID,
			Nickname:  user.Nickname,
			Username:  user.Username,
			Phone:     user.Phone,
			Roles:     roles,
			CreatedAt: user.CreatedAt.Format("2006-01-02 15:04:05"),
			UpdatedAt: user.UpdatedAt.Format("2006-01-02 15:04:05"),
		})
	}
	return data, nil
}

func (s *adminService) AdminUserUpdate(ctx context.Context, req *v1.AdminUserUpdateRequest) error {
	old, _ := s.adminRepository.GetAdminUser(ctx, req.ID)
	if req.Password != "" {
		hash, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
		if err != nil {
			return err
		}
		req.Password = string(hash)
	} else {
		req.Password = old.Password
	}
	err := s.adminRepository.UpdateUserRoles(ctx, req.ID, req.Roles)
	if err != nil {
		return err
	}
	return s.adminRepository.AdminUserUpdate(ctx, &model.AdminUser{
		Model: gorm.Model{
			ID: req.ID,
		},
		Email:    req.Email,
		Password: req.Password,
		Nickname: req.Nickname,
		Phone:    req.Phone,
		Username: req.Username,
	})

}

func (s *adminService) AdminUserCreate(ctx context.Context, req *v1.AdminUserCreateRequest) error {
	hash, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
	if err != nil {
		return err
	}
	req.Password = string(hash)
	err = s.adminRepository.AdminUserCreate(ctx, &model.AdminUser{
		Email:    req.Email,
		Nickname: req.Nickname,
		Phone:    req.Phone,
		Username: req.Username,
		Password: req.Password,
	})
	if err != nil {
		return err
	}
	user, err := s.adminRepository.GetAdminUserByUsername(ctx, req.Username)
	if err != nil {
		return err
	}
	err = s.adminRepository.UpdateUserRoles(ctx, user.ID, req.Roles)
	if err != nil {
		return err
	}
	return err

}

func (s *adminService) AdminUserDelete(ctx context.Context, id uint) error {
	// 删除用户角色
	err := s.adminRepository.DeleteUserRoles(ctx, id)
	if err != nil {
		return err
	}
	return s.adminRepository.AdminUserDelete(ctx, id)
}

func (s *adminService) UpdateRolePermission(ctx context.Context, req *v1.UpdateRolePermissionRequest) error {
	permissions := map[string]struct{}{}
	for _, v := range req.List {
		perm := strings.Split(v, model.PermSep)
		if len(perm) == 2 {
			permissions[v] = struct{}{}
		}

	}
	return s.adminRepository.UpdateRolePermission(ctx, req.Role, permissions)
}

func (s *adminService) GetApis(ctx context.Context, req *v1.GetApisRequest) (*v1.GetApisResponseData, error) {
	list, total, err := s.adminRepository.GetApis(ctx, req)
	if err != nil {
		return nil, err
	}
	groups, err := s.adminRepository.GetApiGroups(ctx)
	if err != nil {
		return nil, err
	}
	data := &v1.GetApisResponseData{
		List:   make([]v1.ApiDataItem, 0),
		Total:  total,
		Groups: groups,
	}
	for _, api := range list {
		data.List = append(data.List, v1.ApiDataItem{
			CreatedAt: api.CreatedAt.Format("2006-01-02 15:04:05"),
			Group:     api.Group,
			ID:        api.ID,
			Method:    api.Method,
			Name:      api.Name,
			Path:      api.Path,
			UpdatedAt: api.UpdatedAt.Format("2006-01-02 15:04:05"),
		})
	}
	return data, nil
}

func (s *adminService) ApiUpdate(ctx context.Context, req *v1.ApiUpdateRequest) error {
	return s.adminRepository.ApiUpdate(ctx, &model.Api{
		Group:  req.Group,
		Method: req.Method,
		Name:   req.Name,
		Path:   req.Path,
		Model: gorm.Model{
			ID: req.ID,
		},
	})
}

func (s *adminService) ApiCreate(ctx context.Context, req *v1.ApiCreateRequest) error {
	return s.adminRepository.ApiCreate(ctx, &model.Api{
		Group:  req.Group,
		Method: req.Method,
		Name:   req.Name,
		Path:   req.Path,
	})
}

func (s *adminService) ApiDelete(ctx context.Context, id uint) error {
	return s.adminRepository.ApiDelete(ctx, id)
}

func (s *adminService) GetUserPermissions(ctx context.Context, uid uint) (*v1.GetUserPermissionsData, error) {
	data := &v1.GetUserPermissionsData{
		List: []string{},
	}
	list, err := s.adminRepository.GetUserPermissions(ctx, uid)
	if err != nil {
		return nil, err
	}
	for _, v := range list {
		if len(v) == 3 {
			data.List = append(data.List, strings.Join([]string{v[1], v[2]}, model.PermSep))
		}
	}
	return data, nil
}
func (s *adminService) GetRolePermissions(ctx context.Context, role string) (*v1.GetRolePermissionsData, error) {
	data := &v1.GetRolePermissionsData{
		List: []string{},
	}
	list, err := s.adminRepository.GetRolePermissions(ctx, role)
	if err != nil {
		return nil, err
	}
	for _, v := range list {
		if len(v) == 3 {
			data.List = append(data.List, strings.Join([]string{v[1], v[2]}, model.PermSep))
		}
	}
	return data, nil
}

func (s *adminService) MenuUpdate(ctx context.Context, req *v1.MenuUpdateRequest) error {
	return s.adminRepository.MenuUpdate(ctx, &model.Menu{
		Component:  req.Component,
		Icon:       req.Icon,
		KeepAlive:  req.KeepAlive,
		HideInMenu: req.HideInMenu,
		Locale:     req.Locale,
		Weight:     req.Weight,
		Name:       req.Name,
		ParentID:   req.ParentID,
		Path:       req.Path,
		Redirect:   req.Redirect,
		Title:      req.Title,
		URL:        req.URL,
		Model: gorm.Model{
			ID: req.ID,
		},
	})
}

func (s *adminService) MenuCreate(ctx context.Context, req *v1.MenuCreateRequest) error {
	return s.adminRepository.MenuCreate(ctx, &model.Menu{
		Component:  req.Component,
		Icon:       req.Icon,
		KeepAlive:  req.KeepAlive,
		HideInMenu: req.HideInMenu,
		Locale:     req.Locale,
		Weight:     req.Weight,
		Name:       req.Name,
		ParentID:   req.ParentID,
		Path:       req.Path,
		Redirect:   req.Redirect,
		Title:      req.Title,
		URL:        req.URL,
	})
}

func (s *adminService) MenuDelete(ctx context.Context, id uint) error {
	return s.adminRepository.MenuDelete(ctx, id)
}


func (s *adminService) GetMenus(ctx context.Context, uid uint) (*v1.GetMenuResponseData, error) {
	// 步骤 1: 从数据库中一次性获取所有菜单项。
	// 建议在这里就进行初步排序，确保基础顺序
	menuList, err := s.adminRepository.GetMenuList(ctx) // 最好让此方法返回按 Weight, ID 排序后的结果
	if err != nil {
		s.Logger.WithContext(ctx).Error("GetMenuList error", zap.Error(err))
		return nil, err
	}

	// 步骤 2: 获取当前用户的完整权限列表。
	permissions, err := s.adminRepository.GetUserPermissions(ctx, uid)
	if err != nil {
		return nil, err
	}

	// 步骤 3: 创建一个以菜单ID为键、菜单对象指针为值的映射（Map），用于快速查找。
	allMenusMap := make(map[uint]*model.Menu)
	for i := range menuList {
		allMenusMap[menuList[i].ID] = &menuList[i]
	}

	// 步骤 4: 创建一个集合（Set），存放用户被明确授权可以访问的菜单路径。
	permittedMenuPaths := make(map[string]struct{})
	isSuperAdmin := convertor.ToString(uid) == model.AdminUserID // 提前判断是否为超级管理员

	for _, permission := range permissions {
		// 超级管理员拥有所有菜单权限，或普通用户拥有特定菜单权限
		if isSuperAdmin || (len(permission) == 3 && strings.HasPrefix(permission[1], model.MenuResourcePrefix)) {
			// 移除菜单资源特有的前缀，得到干净的菜单路径。
			permittedMenuPaths[strings.TrimPrefix(permission[1], model.MenuResourcePrefix)] = struct{}{}
		}
	}

	// 步骤 5: 构建最终的菜单列表，核心逻辑是确保所有有权限访问的子菜单，其父菜单也一定会被包含进来。
	finalMenusMap := make(map[uint]v1.MenuDataItem)
	for _, menu := range menuList {
		if _, ok := permittedMenuPaths[menu.Path]; ok {
			curr := &menu
			for curr != nil {
				if _, exists := finalMenusMap[curr.ID]; exists {
					break
				}
				finalMenusMap[curr.ID] = v1.MenuDataItem{
					ID:         curr.ID,
					Name:       curr.Name,
					Title:      curr.Title,
					Path:       curr.Path,
					Component:  curr.Component,
					Redirect:   curr.Redirect,
					KeepAlive:  curr.KeepAlive,
					HideInMenu: curr.HideInMenu,
					Locale:     curr.Locale,
					Weight:     curr.Weight,
					Icon:       curr.Icon,
					ParentID:   curr.ParentID,
					UpdatedAt:  curr.UpdatedAt.Format("2006-01-02 15:04:05"),
					URL:        curr.URL,
				}
				if curr.ParentID > 0 {
					curr = allMenusMap[curr.ParentID]
				} else {
					curr = nil
				}
			}
		}
	}

	// 步骤 6: 将Map形式的最终结果转换为列表（Slice）。
	list := make([]v1.MenuDataItem, 0, len(finalMenusMap))
	for _, menuItem := range finalMenusMap {
		list = append(list, menuItem)
	}

	// ================= FIX STARTS HERE =================

	// 步骤 7: 对菜单列表进行排序，确保每次返回的顺序一致。
	// 排序规则：
	// 1. 主要按权重 (Weight) 升序排列。
	// 2. 如果权重相同，则按 ID 升序排列，作为稳定的次要排序，确保顺序唯一。
	sort.Slice(list, func(i, j int) bool {
		// 如果权重不同，按权重比较
		if list[i].Weight != list[j].Weight {
			return list[i].Weight > list[j].Weight
		}
		// 如果权重相同，按ID比较，保证稳定排序
		return list[i].ID < list[j].ID
	})

	// ================= FIX ENDS HERE ===================

	data := &v1.GetMenuResponseData{
		List: list,
	}

	return data, nil
}
func (s *adminService) GetAdminMenus(ctx context.Context) (*v1.GetMenuResponseData, error) {
	menuList, err := s.adminRepository.GetMenuList(ctx)
	if err != nil {
		s.Logger.WithContext(ctx).Error("GetMenuList error", zap.Error(err))
		return nil, err
	}
	data := &v1.GetMenuResponseData{
		List: make([]v1.MenuDataItem, 0),
	}
	for _, menu := range menuList {
		data.List = append(data.List, v1.MenuDataItem{
			ID:         menu.ID,
			Name:       menu.Name,
			Title:      menu.Title,
			Path:       menu.Path,
			Component:  menu.Component,
			Redirect:   menu.Redirect,
			KeepAlive:  menu.KeepAlive,
			HideInMenu: menu.HideInMenu,
			Locale:     menu.Locale,
			Weight:     menu.Weight,
			Icon:       menu.Icon,
			ParentID:   menu.ParentID,
			UpdatedAt:  menu.UpdatedAt.Format("2006-01-02 15:04:05"),
			URL:        menu.URL,
		})
	}
	return data, nil
}

func (s *adminService) RoleUpdate(ctx context.Context, req *v1.RoleUpdateRequest) error {
	return s.adminRepository.RoleUpdate(ctx, &model.Role{
		Name: req.Name,
		Sid:  req.Sid,
		Model: gorm.Model{
			ID: req.ID,
		},
	})
}

func (s *adminService) RoleCreate(ctx context.Context, req *v1.RoleCreateRequest) error {
	_, err := s.adminRepository.GetRoleBySid(ctx, req.Sid)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return s.adminRepository.RoleCreate(ctx, &model.Role{
				Name: req.Name,
				Sid:  req.Sid,
			})
		} else {
			return err
		}
	}
	return nil
}

func (s *adminService) RoleDelete(ctx context.Context, id uint) error {
	old, err := s.adminRepository.GetRole(ctx, id)
	if err != nil {
		return err
	}
	if err := s.adminRepository.CasbinRoleDelete(ctx, old.Sid); err != nil {
		return err
	}
	return s.adminRepository.RoleDelete(ctx, id)
}

func (s *adminService) GetRoles(ctx context.Context, req *v1.GetRoleListRequest) (*v1.GetRolesResponseData, error) {
	list, total, err := s.adminRepository.GetRoles(ctx, req)
	if err != nil {
		return nil, err
	}
	data := &v1.GetRolesResponseData{
		List:  make([]v1.RoleDataItem, 0),
		Total: total,
	}
	for _, role := range list {
		data.List = append(data.List, v1.RoleDataItem{
			ID:        role.ID,
			Name:      role.Name,
			Sid:       role.Sid,
			UpdatedAt: role.UpdatedAt.Format("2006-01-02 15:04:05"),
			CreatedAt: role.CreatedAt.Format("2006-01-02 15:04:05"),
		})

	}
	return data, nil
}