package service

import (
	"errors"

	"github.com/gouki/lunar-server/internal/config"
	"github.com/gouki/lunar-server/internal/model"
	"gorm.io/gorm"
)

// WikiService 百科服务
type WikiService struct {
	db *gorm.DB
}

// NewWikiService 创建百科服务
func NewWikiService() *WikiService {
	return &WikiService{db: config.GetDB()}
}

// ListEntries 百科条目列表（status<0 表示不过滤状态，供管理后台使用）
func (s *WikiService) ListEntries(category, keyword string, status int) ([]*model.WikiEntry, error) {
	query := s.db.Model(&model.WikiEntry{})
	if status >= 0 {
		query = query.Where("status = ?", status)
	}
	if category != "" {
		query = query.Where("category = ?", category)
	}
	if keyword != "" {
		like := "%" + keyword + "%"
		query = query.Where("title LIKE ? OR brief LIKE ? OR content LIKE ?", like, like, like)
	}

	var entries []*model.WikiEntry
	if err := query.Order("sort ASC, id ASC").Find(&entries).Error; err != nil {
		return nil, err
	}
	return entries, nil
}

// CreateEntry 新增百科条目
func (s *WikiService) CreateEntry(entry *model.WikiEntry) error {
	if entry.Category == "" || entry.Title == "" {
		return errors.New("分类和标题不能为空")
	}
	if entry.Status == 0 {
		entry.Status = 1
	}
	return s.db.Create(entry).Error
}

// UpdateEntry 更新百科条目
func (s *WikiService) UpdateEntry(id uint, entry *model.WikiEntry) error {
	var existing model.WikiEntry
	if err := s.db.First(&existing, id).Error; err != nil {
		return err
	}
	return s.db.Model(&existing).Updates(map[string]interface{}{
		"category": entry.Category,
		"title":    entry.Title,
		"brief":    entry.Brief,
		"content":  entry.Content,
		"sort":     entry.Sort,
		"status":   entry.Status,
	}).Error
}

// DeleteEntry 删除百科条目
func (s *WikiService) DeleteEntry(id uint) error {
	return s.db.Delete(&model.WikiEntry{}, id).Error
}

// OnThisDayResult 某一天的历史数据
type OnThisDayResult struct {
	Events    []model.WikiOnThisDay `json:"events"`
	Births    []model.WikiOnThisDay `json:"births"`
	Deaths    []model.WikiOnThisDay `json:"deaths"`
	Festivals []model.WikiOnThisDay `json:"festivals"`
}

// GetOnThisDay 查询某一天的历史上的今天数据（各板块限量返回）
func (s *WikiService) GetOnThisDay(month, day int) (*OnThisDayResult, error) {
	if month < 1 || month > 12 || day < 1 || day > 31 {
		return nil, errors.New("日期参数无效")
	}

	var all []model.WikiOnThisDay
	if err := s.db.Where("month = ? AND day = ? AND status = 1", month, day).
		Order("year ASC, id ASC").
		Find(&all).Error; err != nil {
		return nil, err
	}

	result := &OnThisDayResult{
		Events:    make([]model.WikiOnThisDay, 0),
		Births:    make([]model.WikiOnThisDay, 0),
		Deaths:    make([]model.WikiOnThisDay, 0),
		Festivals: make([]model.WikiOnThisDay, 0),
	}
	limits := map[string]int{"event": 20, "birth": 15, "death": 10, "festival": 10}
	for _, item := range all {
		switch item.Kind {
		case "event":
			if len(result.Events) < limits["event"] {
				result.Events = append(result.Events, item)
			}
		case "birth":
			if len(result.Births) < limits["birth"] {
				result.Births = append(result.Births, item)
			}
		case "death":
			if len(result.Deaths) < limits["death"] {
				result.Deaths = append(result.Deaths, item)
			}
		case "festival":
			if len(result.Festivals) < limits["festival"] {
				result.Festivals = append(result.Festivals, item)
			}
		}
	}
	return result, nil
}

// SyncStatus 同步状态（管理后台展示）
type SyncStatus struct {
	Running    bool               `json:"running"`
	TotalDays  int64              `json:"totalDays"`  // 已覆盖的天数
	TotalItems int64              `json:"totalItems"` // 总条目数
	LastSync   *model.WikiSyncLog `json:"lastSync"`
}

// GetSyncStatus 获取同步状态
func (s *WikiService) GetSyncStatus(running bool) (*SyncStatus, error) {
	status := &SyncStatus{Running: running}

	var totalDays int64
	s.db.Model(&model.WikiOnThisDay{}).Where("status = 1").
		Select("COUNT(DISTINCT month, day) AS c").Scan(&totalDays)
	status.TotalDays = totalDays
	s.db.Model(&model.WikiOnThisDay{}).Where("status = 1").Count(&status.TotalItems)

	var lastSync model.WikiSyncLog
	if err := s.db.Order("id DESC").First(&lastSync).Error; err == nil {
		status.LastSync = &lastSync
	}
	return status, nil
}