package service

import (
	"context"
	"cms-api/internal/dao"
	"cms-api/internal/model"
	"encoding/json"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gtime"
)

type sRole struct{}

func Role() *sRole {
	return &sRole{}
}

// GetById 根据ID获取角色信息
func (s *sRole) GetById(ctx context.Context, id int) (*model.Role, error) {
	return dao.Role.GetById(ctx, id)
}

// List 获取角色列表
func (s *sRole) List(ctx context.Context, req *model.RoleListRequest) (*model.PageResponse, error) {
	var (
		page     = req.Page
		pageSize = req.PageSize
	)

	if page <= 0 {
		page = 1
	}
	if pageSize <= 0 {
		pageSize = 10
	}

	// 设置分页参数
	req.Page = page
	req.PageSize = pageSize

	// 获取列表
	roles, total, err := dao.Role.List(ctx, req)
	if err != nil {
		return nil, err
	}

	return &model.PageResponse{
		List:       roles,
		Total:      total,
		Page:       page,
		PageSize:   pageSize,
		TotalPages: (total + pageSize - 1) / pageSize,
	}, nil
}

// GetAll 获取所有启用的角色
func (s *sRole) GetAll(ctx context.Context) ([]*model.Role, error) {
	return dao.Role.GetAll(ctx)
}

// Create 创建角色
func (s *sRole) Create(ctx context.Context, req *model.CreateRoleRequest) error {
	// 检查角色名称是否存在
	existRole, err := dao.Role.GetByName(ctx, req.Name)
	if err != nil {
		return err
	}
	if existRole != nil {
		return gerror.New("角色名称已存在")
	}

	// 序列化权限列表
	permissionsJson, err := json.Marshal(req.Permissions)
	if err != nil {
		return gerror.New("权限数据格式错误")
	}

	// 创建角色
	role := &model.Role{
		Name:        req.Name,
		Description: req.Description,
		Permissions: string(permissionsJson),
		Status:      req.Status,
		CreatedAt:   gtime.Now(),
		UpdatedAt:   gtime.Now(),
	}

	_, err = dao.Role.Create(ctx, role)
	return err
}

// Update 更新角色
func (s *sRole) Update(ctx context.Context, id int, req *model.UpdateRoleRequest) error {
	// 检查角色是否存在
	role, err := s.GetById(ctx, id)
	if err != nil {
		return err
	}
	if role == nil {
		return gerror.New("角色不存在")
	}

	// 检查角色名称是否被其他角色使用
	existRole, err := dao.Role.GetByName(ctx, req.Name)
	if err != nil {
		return err
	}
	if existRole != nil && existRole.Id != id {
		return gerror.New("角色名称已被使用")
	}

	// 序列化权限列表
	permissionsJson, err := json.Marshal(req.Permissions)
	if err != nil {
		return gerror.New("权限数据格式错误")
	}

	// 更新角色
	updateData := g.Map{
		"name":        req.Name,
		"description": req.Description,
		"permissions": string(permissionsJson),
		"status":      req.Status,
		"updated_at":  gtime.Now(),
	}

	return dao.Role.Update(ctx, id, updateData)
}

// Delete 删除角色
func (s *sRole) Delete(ctx context.Context, id int) error {
	// 检查角色是否存在
	role, err := s.GetById(ctx, id)
	if err != nil {
		return err
	}
	if role == nil {
		return gerror.New("角色不存在")
	}

	// TODO: 检查是否有用户使用该角色
	// 这里可以添加检查逻辑，防止删除正在使用的角色

	return dao.Role.Delete(ctx, id)
}

// UpdateStatus 更新角色状态
func (s *sRole) UpdateStatus(ctx context.Context, id int, status int) error {
	// 检查角色是否存在
	role, err := s.GetById(ctx, id)
	if err != nil {
		return err
	}
	if role == nil {
		return gerror.New("角色不存在")
	}

	return dao.Role.UpdateStatus(ctx, id, status)
}

// GetPermissions 获取所有可用权限
func (s *sRole) GetPermissions(ctx context.Context) ([]model.PermissionGroup, error) {
	// 定义系统权限
	permissions := []model.PermissionGroup{
		{
			Name:        "用户管理",
			Description: "用户相关权限",
			Permissions: []model.Permission{
				{Key: "user.list", Name: "查看用户列表", Description: "查看用户列表权限", Group: "用户管理"},
				{Key: "user.create", Name: "创建用户", Description: "创建用户权限", Group: "用户管理"},
				{Key: "user.update", Name: "编辑用户", Description: "编辑用户权限", Group: "用户管理"},
				{Key: "user.delete", Name: "删除用户", Description: "删除用户权限", Group: "用户管理"},
				{Key: "user.status", Name: "管理用户状态", Description: "管理用户状态权限", Group: "用户管理"},
			},
		},
		{
			Name:        "角色管理",
			Description: "角色权限相关权限",
			Permissions: []model.Permission{
				{Key: "role.list", Name: "查看角色列表", Description: "查看角色列表权限", Group: "角色管理"},
				{Key: "role.create", Name: "创建角色", Description: "创建角色权限", Group: "角色管理"},
				{Key: "role.update", Name: "编辑角色", Description: "编辑角色权限", Group: "角色管理"},
				{Key: "role.delete", Name: "删除角色", Description: "删除角色权限", Group: "角色管理"},
			},
		},
		{
			Name:        "内容管理",
			Description: "内容相关权限",
			Permissions: []model.Permission{
				{Key: "article.list", Name: "查看文章列表", Description: "查看文章列表权限", Group: "内容管理"},
				{Key: "article.create", Name: "创建文章", Description: "创建文章权限", Group: "内容管理"},
				{Key: "article.update", Name: "编辑文章", Description: "编辑文章权限", Group: "内容管理"},
				{Key: "article.delete", Name: "删除文章", Description: "删除文章权限", Group: "内容管理"},
				{Key: "news.list", Name: "查看新闻列表", Description: "查看新闻列表权限", Group: "内容管理"},
				{Key: "news.create", Name: "创建新闻", Description: "创建新闻权限", Group: "内容管理"},
				{Key: "news.update", Name: "编辑新闻", Description: "编辑新闻权限", Group: "内容管理"},
				{Key: "news.delete", Name: "删除新闻", Description: "删除新闻权限", Group: "内容管理"},
			},
		},
		{
			Name:        "附件管理",
			Description: "附件相关权限",
			Permissions: []model.Permission{
				{Key: "attachment.list", Name: "查看附件列表", Description: "查看附件列表权限", Group: "附件管理"},
				{Key: "attachment.upload", Name: "上传附件", Description: "上传附件权限", Group: "附件管理"},
				{Key: "attachment.delete", Name: "删除附件", Description: "删除附件权限", Group: "附件管理"},
			},
		},
		{
			Name:        "系统管理",
			Description: "系统相关权限",
			Permissions: []model.Permission{
				{Key: "config.list", Name: "查看系统配置", Description: "查看系统配置权限", Group: "系统管理"},
				{Key: "config.update", Name: "修改系统配置", Description: "修改系统配置权限", Group: "系统管理"},
			},
		},
	}

	return permissions, nil
}

// CheckPermission 检查权限
func (s *sRole) CheckPermission(ctx context.Context, roleId int, permission string) (bool, error) {
	return dao.Role.CheckPermission(ctx, roleId, permission)
}