package fetchers

import (
	"llostre/backend/notes"
	"sync"
	"time"
)

type CacheEntry struct {
	Note      *notes.Note
	ExpiresAt time.Time
}

type Cache struct {
	posts    map[string]*CacheEntry
	profiles map[string]*AuthorCacheEntry
	mu       sync.RWMutex
}

func NewCache() *Cache {
	return &Cache{
		posts:    make(map[string]*CacheEntry),
		profiles: make(map[string]*AuthorCacheEntry),
	}
}

func (c *Cache) Get(uri string) (*notes.Note, bool) {
	c.mu.Lock()
	defer c.mu.Unlock()

	entry, exists := c.posts[uri]

	if !exists {
		return nil, false
	}

	if time.Now().After(entry.ExpiresAt) {
		delete(c.posts, uri)
		return nil, false
	}

	return entry.Note, true
}

func (c *Cache) Set(uri string, note *notes.Note) {
	c.mu.Lock()
	defer c.mu.Unlock()

	c.posts[uri] = &CacheEntry{
		Note:      note,
		ExpiresAt: time.Now().Add(15 * time.Minute),
	}
}

func (c *Cache) GetMany(uris []string) map[string]*notes.Note {
	c.mu.Lock()
	defer c.mu.Unlock()

	result := make(map[string]*notes.Note)
	now := time.Now()

	for _, uri := range uris {
		entry, exists := c.posts[uri]
		if !exists {
			continue
		}

		if now.After(entry.ExpiresAt) {
			delete(c.posts, uri)
			continue
		}

		result[uri] = entry.Note
	}

	return result
}

type AuthorCacheEntry struct {
	Author    *notes.Author
	ExpiresAt time.Time
}

func (c *Cache) GetProfile(did string) (*notes.Author, bool) {
	c.mu.Lock()
	defer c.mu.Unlock()

	entry, exists := c.profiles[did]
	if !exists {
		return nil, false
	}

	if time.Now().After(entry.ExpiresAt) {
		delete(c.profiles, did)
		return nil, false
	}

	return entry.Author, true
}

func (c *Cache) SetAuthor(did string, author *notes.Author) {
	c.mu.Lock()
	defer c.mu.Unlock()

	c.profiles[did] = &AuthorCacheEntry{
		Author:    author,
		ExpiresAt: time.Now().Add(15 * time.Minute),
	}
}