package column

import (
	"cls/internal/domain/column"
	"cls/internal/domain/purchase"
	"cls/internal/domain/user"
	"cls/pkg/logger"
	"cls/pkg/util/page"
	"cls/pkg/web"
	"errors"
)

var (
	ErrInvalidTitle = errors.New("标题不能为空")
	ErrNotFound     = errors.New("专栏不存在")
	ErrInvalidPage  = errors.New("无效的分页参数")
)

// Service 专栏应用服务
type Service struct {
	repo         column.ColumnRepository
	purchaseRepo purchase.Repository
	userRepo     user.UserRepository
	log          logger.Logger
}

// NewService 创建专栏服务
func NewService(repo column.ColumnRepository, purchaseRepo purchase.Repository, userRepo user.UserRepository, log logger.New) *Service {
	return &Service{
		repo:         repo,
		purchaseRepo: purchaseRepo,
		userRepo:     userRepo,
		log:          log("cls:service:column"),
	}
}

// CreateColumn 创建专栏
func (s *Service) CreateColumn(req *CreateColumnReq) (*ColumnDto, error) {
	if req.Title == "" {
		return nil, ErrInvalidTitle
	}

	col := column.NewColumn(req.Title, req.Brief, req.Cover, req.AuthorID)
	if err := s.repo.Save(col); err != nil {
		s.log.Error("failed to save column", "error", err)
		return nil, err
	}
	return ToDto(col), nil
}

// GetColumn 获取专栏信息
func (s *Service) GetColumn(ePhone string, name string) (*ColumnDto, error) {
	col, err := s.repo.FindByName(name)
	if err != nil {
		s.log.Error("failed to find column", "error", err)
		return nil, err
	}
	columnDto := &ColumnDto{
		ID:     col.ID,
		Title:  col.Title,
		Brief:  col.Brief,
		Cover:  col.Brief,
		Unlock: false,
	}
	if ePhone == "" {
		return columnDto, nil
	}
	userData, err := s.userRepo.FindByPhone(ePhone)
	if err != nil {
		s.log.Error(err.Error())
		return columnDto, nil
	}
	purchaseData, err := s.purchaseRepo.FindColumnById(userData.Id, col.ID)
	if err != nil {
		s.log.Error(err)
		return columnDto, nil
	}
	if len(purchaseData) != 0 {
		if purchaseData[0].ContentId == col.ID {
			columnDto.Unlock = true
		}
	}
	return columnDto, nil
}

// GetAuthorColumns 获取作者的专栏列表
func (s *Service) GetAuthorColumns(authorID uint64) ([]*ColumnDto, error) {
	cols, err := s.repo.FindByAuthorID(authorID)
	if err != nil {
		s.log.Error("failed to find author columns", "error", err)
		return nil, err
	}
	return ToDtoList(cols), nil
}

// GetColumnList 获取专栏列表
func (s *Service) GetColumnList(p *page.Page, params map[string]string) error {
	conds := web.ParseFilters(params)
	cols := make([]*column.Column, 0)
	p.Content = &cols
	if err := s.repo.FindAll(p, conds); err != nil {
		s.log.Error("failed to find columns", "error", err)
		return err
	}
	p.Content = ToDtoList(p.Content.([]*column.Column))
	return nil
}

// UpdateColumn 更新专栏信息
func (s *Service) UpdateColumn(req *UpdateColumnReq) (*ColumnDto, error) {
	if req.Title == "" {
		return nil, ErrInvalidTitle
	}

	col, err := s.repo.FindByID(req.ID)
	if err != nil {
		s.log.Error("failed to find column", "error", err)
		return nil, err
	}
	if col == nil {
		return nil, ErrNotFound
	}

	col.Title = req.Title
	col.Brief = req.Brief
	col.Cover = req.Cover

	if err := s.repo.Update(col); err != nil {
		s.log.Error("failed to update column", "error", err)
		return nil, err
	}
	return ToDto(col), nil
}

// DeleteColumn 删除专栏
func (s *Service) DeleteColumn(id uint64) error {
	return s.repo.Delete(id)
}

// UpdateColumnStatus 更新专栏状态
func (s *Service) UpdateColumnStatus(req *UpdateStatusReq) (*ColumnDto, error) {
	col, err := s.repo.FindByID(req.ID)
	if err != nil {
		s.log.Error("failed to find column", "error", err)
		return nil, err
	}
	if col == nil {
		return nil, ErrNotFound
	}

	col.Status = req.Status
	if err := s.repo.Update(col); err != nil {
		s.log.Error("failed to update column status", "error", err)
		return nil, err
	}
	return ToDto(col), nil
}

// UpdateFollowNum 更新关注人数
func (s *Service) UpdateFollowNum(id uint64, isAdd bool) error {
	col, err := s.repo.FindByID(id)
	if err != nil {
		s.log.Error("failed to find column", "error", err)
		return err
	}
	if col == nil {
		return ErrNotFound
	}

	if isAdd {
		col.AddFollow()
	} else {
		col.RemoveFollow()
	}

	if err := s.repo.Update(col); err != nil {
		s.log.Error("failed to update column follow num", "error", err)
		return err
	}
	return nil
}

// UpdatePurchaseNum 更新购买人数
func (s *Service) UpdatePurchaseNum(id uint64, isAdd bool) error {
	col, err := s.repo.FindByID(id)
	if err != nil {
		s.log.Error("failed to find column", "error", err)
		return err
	}
	if col == nil {
		return ErrNotFound
	}

	if isAdd {
		col.AddPurchase()
	} else {
		col.RemovePurchase()
	}

	if err := s.repo.Update(col); err != nil {
		s.log.Error("failed to update column purchase num", "error", err)
		return err
	}
	return nil
}