package cache

import (
	"encoding/json"
	"fmt"
	"log"
	"sync"
	"time"

	"MobileMkch/models"
)

type Cache struct {
	mu    sync.RWMutex
	items map[string]cacheItem
}

type cacheItem struct {
	Data      interface{}
	Timestamp time.Time
	TTL       time.Duration
}

var (
	instance *Cache
	once     sync.Once
)

func GetCache() *Cache {
	once.Do(func() {
		instance = &Cache{
			items: make(map[string]cacheItem),
		}
		go instance.cleanup()
	})
	return instance
}

func (c *Cache) Set(key string, data interface{}, ttl time.Duration) {
	c.mu.Lock()
	defer c.mu.Unlock()

	c.items[key] = cacheItem{
		Data:      data,
		Timestamp: time.Now(),
		TTL:       ttl,
	}

	log.Printf("Кэшировано: %s (TTL: %v)", key, ttl)
}

func (c *Cache) Get(key string) (interface{}, bool) {
	c.mu.RLock()
	defer c.mu.RUnlock()

	item, exists := c.items[key]
	if !exists {
		return nil, false
	}

	if time.Since(item.Timestamp) > item.TTL {
		log.Printf("Кэш устарел: %s", key)
		return nil, false
	}

	log.Printf("Кэш найден: %s", key)
	return item.Data, true
}

func (c *Cache) Delete(key string) {
	c.mu.Lock()
	defer c.mu.Unlock()

	delete(c.items, key)
	log.Printf("Кэш удален: %s", key)
}

func (c *Cache) Clear() {
	c.mu.Lock()
	defer c.mu.Unlock()

	c.items = make(map[string]cacheItem)
	log.Printf("Кэш очищен")
}

func (c *Cache) cleanup() {
	ticker := time.NewTicker(5 * time.Minute)
	defer ticker.Stop()

	for range ticker.C {
		c.mu.Lock()
		now := time.Now()
		for key, item := range c.items {
			if now.Sub(item.Timestamp) > item.TTL {
				delete(c.items, key)
				log.Printf("Автоочистка кэша: %s", key)
			}
		}
		c.mu.Unlock()
	}
}

func (c *Cache) SetBoards(boards []models.Board) {
	data, _ := json.Marshal(boards)
	c.Set("boards", data, 10*time.Minute)
}

func (c *Cache) GetBoards() ([]models.Board, bool) {
	data, exists := c.Get("boards")
	if !exists {
		return nil, false
	}

	var boards []models.Board
	if err := json.Unmarshal(data.([]byte), &boards); err != nil {
		log.Printf("Ошибка десериализации досок: %v", err)
		return nil, false
	}

	return boards, true
}

func (c *Cache) SetThreads(boardCode string, threads []models.Thread) {
	data, _ := json.Marshal(threads)
	c.Set("threads_"+boardCode, data, 5*time.Minute)
}

func (c *Cache) GetThreads(boardCode string) ([]models.Thread, bool) {
	data, exists := c.Get("threads_" + boardCode)
	if !exists {
		return nil, false
	}

	var threads []models.Thread
	if err := json.Unmarshal(data.([]byte), &threads); err != nil {
		log.Printf("Ошибка десериализации тредов: %v", err)
		return nil, false
	}

	return threads, true
}

func (c *Cache) SetThreadsPage(boardCode string, page int, threads []models.Thread) {
	data, _ := json.Marshal(threads)
	key := fmt.Sprintf("threads_%s_page_%d", boardCode, page)
	c.Set(key, data, 3*time.Minute)
}

func (c *Cache) GetThreadsPage(boardCode string, page int) ([]models.Thread, bool) {
	key := fmt.Sprintf("threads_%s_page_%d", boardCode, page)
	data, exists := c.Get(key)
	if !exists {
		return nil, false
	}

	var threads []models.Thread
	if err := json.Unmarshal(data.([]byte), &threads); err != nil {
		log.Printf("Ошибка десериализации тредов страницы: %v", err)
		return nil, false
	}

	return threads, true
}

func (c *Cache) SetThreadDetail(threadID int, thread *models.ThreadDetail) {
	data, _ := json.Marshal(thread)
	c.Set("thread_"+string(rune(threadID)), data, 3*time.Minute)
}

func (c *Cache) GetThreadDetail(threadID int) (*models.ThreadDetail, bool) {
	data, exists := c.Get("thread_" + string(rune(threadID)))
	if !exists {
		return nil, false
	}

	var thread models.ThreadDetail
	if err := json.Unmarshal(data.([]byte), &thread); err != nil {
		log.Printf("Ошибка десериализации треда: %v", err)
		return nil, false
	}

	return &thread, true
}

func (c *Cache) SetComments(threadID int, comments []models.Comment) {
	data, _ := json.Marshal(comments)
	c.Set("comments_"+string(rune(threadID)), data, 3*time.Minute)
}

func (c *Cache) GetComments(threadID int) ([]models.Comment, bool) {
	data, exists := c.Get("comments_" + string(rune(threadID)))
	if !exists {
		return nil, false
	}

	var comments []models.Comment
	if err := json.Unmarshal(data.([]byte), &comments); err != nil {
		log.Printf("Ошибка десериализации комментариев: %v", err)
		return nil, false
	}

	return comments, true
}