package service

import (
	"fmt"
	"mime/multipart"
	"os"
	"path/filepath"
	"time"

	"github.com/rovina/zsp-backend/internal/model"
	"github.com/rovina/zsp-backend/internal/repository"
	"github.com/rovina/zsp-backend/pkg/utils"
)

type CompanyService interface {
	CreateFolder(name, description, category string) (*model.CompanyFolder, error)
	ListFolders() ([]model.CompanyFolder, error)
	GetFolderByID(id uint) (*model.CompanyFolder, error)
	UpdateFolder(id uint, name, description, category string) error
	DeleteFolder(id uint) error

	UploadFiles(folderID *uint, companyName, fileCategory, expireDate, description string, files []*multipart.FileHeader) (int, error)
	ListFiles(folderID *uint) ([]model.CompanyFile, error)
	GetFileByID(id uint) (*model.CompanyFile, error)
	UpdateFile(id uint, companyName, fileCategory, expireDate, description string, folderID *uint) error
	DeleteFile(id uint) error
}

type companyService struct {
	repo repository.CompanyRepository
}

func NewCompanyService(repo repository.CompanyRepository) CompanyService {
	return &companyService{repo: repo}
}

func (s *companyService) CreateFolder(name, description, category string) (*model.CompanyFolder, error) {
	f := &model.CompanyFolder{
		Name:        name,
		Description: description,
		Category:    category,
		CreateTime:  time.Now(),
		UpdateTime:  time.Now(),
	}
	if err := s.repo.CreateFolder(f); err != nil {
		return nil, err
	}
	return f, nil
}

func (s *companyService) ListFolders() ([]model.CompanyFolder, error) {
	return s.repo.ListFolders()
}

func (s *companyService) GetFolderByID(id uint) (*model.CompanyFolder, error) {
	return s.repo.GetFolderByID(id)
}

func (s *companyService) UpdateFolder(id uint, name, description, category string) error {
	f, err := s.repo.GetFolderByID(id)
	if err != nil {
		return err
	}
	f.Name = name
	f.Description = description
	f.Category = category
	f.UpdateTime = time.Now()
	return s.repo.UpdateFolder(f)
}

func (s *companyService) DeleteFolder(id uint) error {
	return s.repo.DeleteFolder(id)
}

func (s *companyService) UploadFiles(folderID *uint, companyName, fileCategory, expireDate, description string, files []*multipart.FileHeader) (int, error) {
	basePath := "./data/company/files"
	if err := os.MkdirAll(basePath, os.ModePerm); err != nil {
		return 0, err
	}

	var expire *time.Time
	if expireDate != "" {
		if t, err := time.Parse("2006-01-02", expireDate); err == nil {
			expire = &t
		}
	}

	count := 0
	for _, fh := range files {
		filename := fmt.Sprintf("%d_%s", time.Now().UnixNano(), fh.Filename)
		savePath := filepath.Join(basePath, filename)
		if err := utils.SaveUploadedFile(fh, savePath); err != nil {
			return count, err
		}

		ext := filepath.Ext(fh.Filename)
		if len(ext) > 0 {
			ext = ext[1:]
		}

		file := &model.CompanyFile{
			FolderID:     0,
			FileName:    fh.Filename,
			FileType:     ext,
			FileSize:     fh.Size,
			UploadTime:   time.Now(),
			CompanyName:  companyName,
			FileCategory: fileCategory,
			ExpireDate:   expire,
			Description:  description,
			FileURL:      "files/" + filename,
		}
		if folderID != nil && *folderID > 0 {
			file.FolderID = *folderID
		}

		if err := s.repo.CreateFile(file); err != nil {
			return count, err
		}
		count++
	}
	return count, nil
}

func (s *companyService) ListFiles(folderID *uint) ([]model.CompanyFile, error) {
	return s.repo.ListFiles(folderID)
}

func (s *companyService) GetFileByID(id uint) (*model.CompanyFile, error) {
	return s.repo.GetFileByID(id)
}

func (s *companyService) UpdateFile(id uint, companyName, fileCategory, expireDate, description string, folderID *uint) error {
	f, err := s.repo.GetFileByID(id)
	if err != nil {
		return err
	}
	f.CompanyName = companyName
	f.FileCategory = fileCategory
	f.Description = description
	if expireDate != "" {
		if t, err := time.Parse("2006-01-02", expireDate); err == nil {
			f.ExpireDate = &t
		}
	} else {
		f.ExpireDate = nil
	}
	if folderID != nil {
		f.FolderID = *folderID
	}
	return s.repo.UpdateFile(f)
}

func (s *companyService) DeleteFile(id uint) error {
	return s.repo.DeleteFile(id)
}