package services

import (
	"platform/pkg/u"
	"platform/web/core"
	g "platform/web/globals"
	"platform/web/models"
	m "platform/web/models"
	q "platform/web/queries"
	"time"

	"gorm.io/gen/field"
)

var AdminRole = &adminRoleService{}

type adminRoleService struct{}

func (r *adminRoleService) ListRoles() (result []*m.AdminRole, err error) {
	return q.AdminRole.
		Order(q.AdminRole.Sort.Asc(), q.AdminRole.CreatedAt.Desc()).
		Find()
}

func (r *adminRoleService) PageRoles(req core.PageReq) (result []*m.AdminRole, count int64, err error) {
	return q.AdminRole.
		Preload(q.AdminRole.Permissions).
		Order(q.AdminRole.Sort.Asc(), q.AdminRole.CreatedAt.Desc()).
		FindByPage(req.GetOffset(), req.GetLimit())
}

func (r *adminRoleService) CreateAdminRole(create *CreateAdminRole) error {
	return q.Q.Transaction(func(q *q.Query) error {

		// 创建角色
		role := &m.AdminRole{
			Name:        create.Name,
			Description: create.Description,
			Active:      u.Else(create.Active, true),
			Sort:        u.Else(create.Sort, 0),
		}
		if err := q.AdminRole.Create(role); err != nil {
			return err
		}

		// 替换权限
		permissions := make([]*models.LinkAdminRolePermission, 0, len(create.Permissions))
		for _, permissionID := range create.Permissions {
			permissions = append(permissions, &models.LinkAdminRolePermission{
				RoleID:       role.ID,
				PermissionID: permissionID,
			})
		}
		if len(permissions) > 0 {
			err := g.Redsync.WithLock(AdminRoleModifyLock, func() error {
				return q.LinkAdminRolePermission.CreateInBatches(permissions, 1000)
			})
			if err != nil {
				return err
			}
		}

		return nil
	})
}

type CreateAdminRole struct {
	Name        string  `json:"name"`
	Description *string `json:"description"`
	Active      *bool   `json:"active"`
	Sort        *int32  `json:"sort"`
	Permissions []int32 `json:"permissions"`
}

func (r *adminRoleService) UpdateAdminRole(update *UpdateAdminRole) error {

	var simples = make([]field.AssignExpr, 0)
	if update.Name != nil {
		simples = append(simples, q.AdminRole.Name.Value(*update.Name))
	}
	if update.Description != nil {
		simples = append(simples, q.AdminRole.Description.Value(*update.Description))
	}
	if update.Active != nil {
		simples = append(simples, q.AdminRole.Active.Value(*update.Active))
	}
	if update.Sort != nil {
		simples = append(simples, q.AdminRole.Sort.Value(*update.Sort))
	}

	err := q.Q.Transaction(func(q *q.Query) error {

		// 修改角色
		_, err := q.AdminRole.
			Where(q.AdminRole.ID.Eq(update.Id)).
			UpdateSimple(simples...)
		if err != nil {
			return err
		}

		// 修改角色关联权限
		if update.Permissions != nil {
			updatePermissions := *update.Permissions
			permissions := make([]*models.LinkAdminRolePermission, len(updatePermissions))
			for i, permissionID := range updatePermissions {
				permissions[i] = &models.LinkAdminRolePermission{
					RoleID:       update.Id,
					PermissionID: permissionID,
				}
			}
			err = g.Redsync.WithLock(AdminRoleModifyLock, func() error {
				if _, err := q.LinkAdminRolePermission.Where(q.LinkAdminRolePermission.RoleID.Eq(update.Id)).Delete(); err != nil {
					return err
				}
				if err = q.LinkAdminRolePermission.CreateInBatches(permissions, 1000); err != nil {
					return err
				}
				return nil
			})
			if err != nil {
				return err
			}
		}

		return nil
	})
	return err
}

type UpdateAdminRole struct {
	Id          int32    `json:"id"`
	Name        *string  `json:"name"`
	Description *string  `json:"description"`
	Active      *bool    `json:"active"`
	Sort        *int32   `json:"sort"`
	Permissions *[]int32 `json:"permissions"`
}

func (r *adminRoleService) RemoveAdminRole(id int32) error {
	_, err := q.AdminRole.Where(q.AdminRole.ID.Eq(id)).UpdateColumn(q.AdminRole.DeletedAt, time.Now())
	return err
}

var AdminRoleModifyLock = "platform:admin_role_permissions:modify"