package server

import (
	"encoding/json"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"time"
	"yoresee_dropbox/internal/store"
)

func (s *Server) handleUpload(w http.ResponseWriter, r *http.Request) {
	r.Body = http.MaxBytesReader(w, r.Body, 100<<20)
	if err := r.ParseMultipartForm(32 << 20); err != nil {
		http.Error(w, "File too large", http.StatusRequestEntityTooLarge)
		return
	}

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

	storageName := generateUUID()
	destPath := filepath.Join(s.workspace, "inbox", storageName)
	dest, err := os.Create(destPath)
	if err != nil {
		http.Error(w, "Failed to save", http.StatusInternalServerError)
		return
	}
	defer dest.Close()

	if _, err := io.Copy(dest, file); err != nil {
		http.Error(w, "Failed to save", http.StatusInternalServerError)
		return
	}

	f := &store.File{
		ID:           generateUUID(),
		OriginalName: header.Filename,
		StorageName:  storageName,
		Dir:          "inbox",
		Size:         header.Size,
		CreatedAt:    time.Now().Unix(),
	}
	if err := s.store.FileCreate(f); err != nil {
		http.Error(w, "Failed to save metadata", http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(map[string]any{"file": f})
}

func (s *Server) handleListFiles(w http.ResponseWriter, r *http.Request) {
	dir := r.URL.Query().Get("dir")
	files, err := s.store.FileList(dir)
	if err != nil {
		http.Error(w, "Failed to list", http.StatusInternalServerError)
		return
	}
	json.NewEncoder(w).Encode(map[string]any{"files": files})
}

func (s *Server) handleDownload(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	f, err := s.store.FileGet(id)
	if err != nil {
		http.Error(w, "Not found", http.StatusNotFound)
		return
	}

	path := filepath.Join(s.workspace, f.Dir, f.StorageName)
	w.Header().Set("Content-Disposition", "attachment; filename="+f.OriginalName)
	http.ServeFile(w, r, path)
}

func (s *Server) handleDeleteFile(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	f, err := s.store.FileGet(id)
	if err != nil {
		http.Error(w, "Not found", http.StatusNotFound)
		return
	}
	if err := s.store.FileDelete(id); err != nil {
		http.Error(w, "Failed to delete", http.StatusInternalServerError)
		return
	}
	os.Remove(filepath.Join(s.workspace, f.Dir, f.StorageName))
	w.WriteHeader(http.StatusNoContent)
}