// cache.go
package main

import (
	"crypto/md5"
	"encoding/hex"
	"os"
	"path/filepath"
	"sync"
)

var (
	cacheDir   = "cache"
	cacheMutex sync.Mutex
	TestMode   bool
)

// InitCache ensures the cache directory exists
func InitCache() {
	if _, err := os.Stat(cacheDir); os.IsNotExist(err) {
		os.Mkdir(cacheDir, 0755)
	}
}

// ClearCache wipes the cache directory (used for Test Mode)
func ClearCache() {
	os.RemoveAll(cacheDir)
	InitCache()
}

// GetCacheFilename generates the hashed filename preserving the extension
func GetCacheFilename(key string) string {
	hash := md5.Sum([]byte(key))
	ext := filepath.Ext(key)
	// Default to .html if no extension (e.g. for processed markdown)
	if ext == "" || ext == ".md" {
		ext = ".html"
	}
	return filepath.Join(cacheDir, hex.EncodeToString(hash[:])+ext)
}