package api

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"os"

	"gitea.mrixs.me/minecraft-platform/backend/internal/core"
	"gitea.mrixs.me/minecraft-platform/backend/internal/core/importer"
	"gitea.mrixs.me/minecraft-platform/backend/internal/database"
	"gitea.mrixs.me/minecraft-platform/backend/internal/models"
)

type ModpackHandler struct {
	ModpackRepo    *database.ModpackRepository
	JanitorService *core.FileJanitorService
}

// ImportModpack обрабатывает загрузку и импорт модпака.
func (h *ModpackHandler) ImportModpack(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseMultipartForm(512 << 20); err != nil { // 512 MB лимит
		http.Error(w, "File too large", http.StatusBadRequest)
		return
	}

	file, _, err := r.FormFile("file")
	if err != nil {
		http.Error(w, "Invalid file upload", http.StatusBadRequest)
		return
	}
	defer file.Close()

	tempFile, err := os.CreateTemp("", "modpack-*.zip")
	if err != nil {
		http.Error(w, "Could not create temp file", http.StatusInternalServerError)
		return
	}
	defer os.Remove(tempFile.Name())
	defer tempFile.Close()

	_, err = io.Copy(tempFile, file)
	if err != nil {
		http.Error(w, "Could not save temp file", http.StatusInternalServerError)
		return
	}

	storagePath := os.Getenv("MODPACKS_STORAGE_PATH")
	imp := &importer.SimpleZipImporter{StoragePath: storagePath}

	files, err := imp.Import(tempFile.Name())
	if err != nil {
		http.Error(w, fmt.Sprintf("Import failed: %v", err), http.StatusInternalServerError)
		return
	}

	modpack := &models.Modpack{
		Name:             r.FormValue("name"),
		DisplayName:      r.FormValue("displayName"),
		MinecraftVersion: r.FormValue("mcVersion"),
	}

	err = h.ModpackRepo.CreateModpackTx(r.Context(), modpack, files)
	if err != nil {
		http.Error(w, fmt.Sprintf("Database save failed: %v", err), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusCreated)
	fmt.Fprintf(w, "Modpack '%s' imported successfully with %d files.", modpack.DisplayName, len(files))

	// Запускаем очистку в фоне, чтобы не блокировать ответ
	go h.JanitorService.CleanOrphanedFiles(context.Background())
}