package projects

import (
	"errors"
	"strings"

	"gorm.io/gorm"
	"senlinai-agent/backend/internal/domain"
)

type Service struct {
	db *gorm.DB
}

type Dashboard struct {
	ProjectID          uint  `json:"project_id"`
	PendingInboxCount  int64 `json:"pending_inbox_count"`
	OpenTaskCount      int64 `json:"open_task_count"`
	RecentNoteCount    int64 `json:"recent_note_count"`
	RecentSessionCount int64 `json:"recent_session_count"`
}

func NewService(database *gorm.DB) *Service {
	return &Service{db: database}
}

func (s *Service) CreateProject(ownerID uint, name string, description string) (*domain.Project, error) {
	name = strings.TrimSpace(name)
	if name == "" {
		return nil, errors.New("project name is required")
	}
	project := &domain.Project{OwnerID: ownerID, Name: name, Description: description}
	return project, s.db.Create(project).Error
}

func (s *Service) ListProjects(ownerID uint) ([]domain.Project, error) {
	var projects []domain.Project
	err := s.db.Where("owner_id = ?", ownerID).Order("updated_at desc").Find(&projects).Error
	return projects, err
}

func (s *Service) CreateTag(projectID uint, name string) (*domain.Tag, error) {
	name = strings.TrimSpace(name)
	if name == "" {
		return nil, errors.New("tag name is required")
	}
	tag := &domain.Tag{ProjectID: projectID, Name: name}
	return tag, s.db.Create(tag).Error
}

func (s *Service) ListTags(projectID uint) ([]domain.Tag, error) {
	var tags []domain.Tag
	err := s.db.Where("project_id = ?", projectID).Order("name asc").Find(&tags).Error
	return tags, err
}

func (s *Service) Dashboard(ownerID uint, projectID uint) (Dashboard, error) {
	var project domain.Project
	if err := s.db.Where("id = ? AND owner_id = ?", projectID, ownerID).First(&project).Error; err != nil {
		return Dashboard{}, err
	}
	dashboard := Dashboard{ProjectID: projectID}
	if err := s.db.Model(&domain.InboxItem{}).Where("project_id = ? AND status = ?", projectID, "open").Count(&dashboard.PendingInboxCount).Error; err != nil {
		return dashboard, err
	}
	if err := s.db.Model(&domain.Task{}).Where("project_id = ? AND status <> ?", projectID, "done").Count(&dashboard.OpenTaskCount).Error; err != nil {
		return dashboard, err
	}
	if err := s.db.Model(&domain.Note{}).Where("project_id = ?", projectID).Count(&dashboard.RecentNoteCount).Error; err != nil {
		return dashboard, err
	}
	if err := s.db.Model(&domain.AISession{}).Where("project_id = ?", projectID).Count(&dashboard.RecentSessionCount).Error; err != nil {
		return dashboard, err
	}
	return dashboard, nil
}