package service

import (
	"fmt"
	"os"
	"path/filepath"

	"filestoragesystem/internal/config"
	"filestoragesystem/internal/model"
	"filestoragesystem/internal/repository"
	"filestoragesystem/pkg/apperr"
)

// ProjectService 项目服务
type ProjectService struct {
	cfg         *config.Config
	projectRepo *repository.ProjectRepo
	fileRepo    *repository.FileRepo
	settingRepo *repository.SettingRepo
	opLogRepo   *repository.OpLogRepo
	webhookSvc  *WebhookService
}

// Create 创建项目
func (s *ProjectService) Create(userID uint, name, description string, storageLimit int64) (*model.Project, error) {
	if name == "" || len(name) > 100 {
		return nil, fmt.Errorf("项目名称不能为空且不超过100字符")
	}
	if _, err := s.projectRepo.FindByName(userID, name); err == nil {
		return nil, apperr.ErrProjectExists
	}
	if storageLimit <= 0 {
		storageLimit = 5368709120 // 5GB
		if v, err := s.settingRepo.GetValue("default_project_limit"); err == nil {
			var n int64
			if _, e := fmt.Sscanf(v, "%d", &n); e == nil && n > 0 {
				storageLimit = n
			}
		}
	}
	p := &model.Project{
		UserID: userID, Name: name, Description: description,
		StorageLimit: storageLimit, Status: 1,
	}
	if err := s.projectRepo.Create(p); err != nil {
		return nil, err
	}
	return p, nil
}

// List 项目列表，all=true时管理员查看全部
func (s *ProjectService) List(userID uint, keyword string, all bool, page, pageSize int) ([]model.Project, int64, error) {
	return s.projectRepo.List(userID, keyword, all, page, pageSize)
}

// Get 项目详情(所有者或管理员)
func (s *ProjectService) Get(userID uint, id uint, isAdmin bool) (*model.Project, error) {
	p, err := s.projectRepo.FindByID(id)
	if err != nil {
		return nil, apperr.ErrNotFound
	}
	if !isAdmin && p.UserID != userID {
		return nil, apperr.ErrForbidden
	}
	return p, nil
}

// Update 更新项目
func (s *ProjectService) Update(userID uint, id uint, isAdmin bool, name, description string, storageLimit int64) (*model.Project, error) {
	p, err := s.Get(userID, id, isAdmin)
	if err != nil {
		return nil, err
	}
	if name != "" && name != p.Name {
		if _, err := s.projectRepo.FindByName(userID, name); err == nil {
			return nil, apperr.ErrProjectExists
		}
		p.Name = name
	}
	if description != "" {
		p.Description = description
	}
	if storageLimit > 0 {
		p.StorageLimit = storageLimit
	}
	if err := s.projectRepo.Update(p); err != nil {
		return nil, err
	}
	return p, nil
}

// Delete 删除项目及其全部文件(硬删除)
func (s *ProjectService) Delete(userID uint, id uint, isAdmin bool) error {
	if _, err := s.Get(userID, id, isAdmin); err != nil {
		return err
	}
	// 删除物理文件
	files, _ := s.fileRepo.ListByProject(id)
	seen := make(map[string]bool)
	for _, f := range files {
		if f.StoredPath != "" && !seen[f.StoredPath] {
			seen[f.StoredPath] = true
			_ = os.Remove(filepath.Join(s.cfg.Storage.Root, f.StoredPath))
		}
	}
	_ = s.fileRepo.DB.Exec("DELETE FROM files WHERE project_id = ?", id).Error
	_ = s.fileRepo.DB.Exec("DELETE FROM temp_links WHERE file_id IN (SELECT id FROM files WHERE project_id = ?)", id).Error

	return s.projectRepo.Delete(id)
}