import { state } from './state.js';
import { showLoading, hideLoading, setStatus } from './ui.js';
import { renderGrid, showEmptyGrid } from './grid.js';
import * as history from './history.js';
import * as fileExplorer from './handlers/file-explorer.js';
import { error, log } from './logger.js';

export function createFolderController({
  btnRename,
  btnSortName,
  btnSortDate,
  dirPath,
  inputPrefix,
  updatePreview,
}) {
  let homeDir = null;

  async function openFolder() {
    log('folder', 'openFolder start', { homeDir });
    let folder = null;
    try {
      folder = await window.api.selectFolder();
    } catch (e) {
      error('folder', 'selectFolder failed', e);
      setStatus(`폴더 열기 실패: ${e.message}`, false);
      return;
    }

    log('folder', 'openFolder selected', { folder });
    if (!folder) return;
    if (homeDir && folder.startsWith(homeDir)) {
      await fileExplorer.loadTree(homeDir, folder);
    } else {
      await fileExplorer.loadTree(folder, folder);
    }
    await loadFolder(folder);
  }

  async function loadFolder(folder) {
    log('folder', 'loadFolder start', { folder });
    if (!folder) return;
    state.currentFolder = folder;
    dirPath.textContent = folder;
    await window.api.setLastFolder(folder);
    await fileExplorer.setSelectedPath(folder);

    showLoading('이미지 목록 불러오는 중...');
    let list = [];
    try {
      list = await window.api.listImages(folder);
      hideLoading();
      log('folder', 'loadFolder listImages complete', { folder, count: list.length });

      if (!list.length) {
        state.files.length = 0;
        state.selectedIdxs.clear();
        showEmptyGrid();
        btnRename.disabled = true;
        setStatus('이미지 파일 없음', false);
        log('folder', 'loadFolder empty', { folder });
        return;
      }

      state.files.length = 0;
      state.files.push(...list);
      state.selectedIdxs.clear();
      state.sortMode = 'name';
      updateSortButtons();
      setStatus(`${state.files.length}개 파일 로드됨`, true);

      const folderName = folder.replace(/\\/g, '/').split('/').pop();
      if (folderName) inputPrefix.value = `${folderName}_`;

      renderGrid();
      updatePreview();
      btnRename.disabled = false;
      history.reset();
      history.pushReorder(state.files);
      log('folder', 'loadFolder done', { folder, count: state.files.length });
    } catch (e) {
      hideLoading();
      error('folder', `loadFolder failed: ${folder}`, e);
      showEmptyGrid();
      btnRename.disabled = true;
      setStatus(`폴더 로드 실패: ${e.message}`, false);
    }
  }

  async function sortFiles(mode) {
    if (!state.files.length) return;
    if (mode === 'name') state.files.sort((a, b) => a.name.localeCompare(b.name, 'ko'));
    else                 state.files.sort((a, b) => a.mtime - b.mtime);

    state.sortMode = mode;
    state.selectedIdxs.clear();
    updateSortButtons();
    await renderGrid();
    setStatus(`${mode === 'name' ? '이름순' : '날짜순'}으로 정렬됨`, true);
    history.pushReorder(state.files);
  }

  function updateSortButtons() {
    btnSortName.classList.toggle('active', state.sortMode === 'name');
    btnSortDate.classList.toggle('active', state.sortMode === 'date');
  }

  return {
    loadFolder,
    openFolder,
    setHomeDir: value => { homeDir = value; },
    sortFiles,
    updateSortButtons,
  };
}