import { state }                                        from './state.js';
import { showLoading, hideLoading, setStatus, showToast } from './ui.js';
import { renderGrid }                                    from './grid.js';
import * as history                                      from './history.js';
import { openModal, closeModal }                         from './modal.js';
import { renderTextList }                                from './utils/dom.js';
import { buildSequentialName, getNameFormat }            from './utils/file-names.js';

const inputPrefix            = document.getElementById('input-prefix');
const inputDigits            = document.getElementById('input-digits');
const inputPostfix           = document.getElementById('input-postfix');
const renameConfirmModal     = document.getElementById('rename-confirm-modal');
const renameConfirmSelectedTitle = renameConfirmModal.querySelector('.rename-title-selected');
const renameConfirmAllTitle      = renameConfirmModal.querySelector('.rename-title-all');
const renameConfirmMsg       = document.getElementById('rename-confirm-msg');
const renameConfirmWarning   = document.getElementById('rename-confirm-selection-warning');
const renameConfirmList      = document.getElementById('rename-confirm-list');
const renameConfirmOkBtn     = document.getElementById('rename-confirm-ok');
const renameConflictModal    = document.getElementById('rename-conflict-modal');
const renameConflictList     = document.getElementById('rename-conflict-list');

let _renameConfirmResolve = null;

renameConfirmOkBtn.addEventListener('click', () => {
  closeRenameConfirm(true);
});

renameConfirmModal.addEventListener('modal:closed', () => {
  resolveRenameConfirm(false);
});

export async function doRename() {
  if (!state.files.length || !state.currentFolder) return;
  const { prefix, digits, postfix } = getNameFormat(inputPrefix, inputDigits, 3, inputPostfix);
  const format = { prefix, digits, postfix };

  const selectedArr   = [...state.selectedIdxs].sort((a, b) => a - b);
  const filesToRename = selectedArr.length > 0
    ? selectedArr.map(i => state.files[i]).filter(Boolean)
    : state.files;

  if (!filesToRename.length) return;

  // 선택된 파일이 있으면 변경될 이름이 미선택 파일 이름과 충돌하는지 확인
  if (selectedArr.length > 0) {
    const unselectedNames = new Set(
      state.files.filter((_, i) => !state.selectedIdxs.has(i)).map(f => f.name)
    );
    const newNames = filesToRename.map((f, i) => buildSequentialName(f.name, i, format));
    const conflicting = newNames.filter(n => unselectedNames.has(n));
    if (conflicting.length) {
      renderTextList(renameConflictList, conflicting);
      openModal(renameConflictModal);
      return;
    }
  }

  const examples = filesToRename.slice(0, 3)
    .map((f, i) => `${f.name}  →  ${buildSequentialName(f.name, i, format)}`);
  const more = filesToRename.length > 3 ? `... 외 ${filesToRename.length - 3}개` : '';

  const confirmed = await showRenameConfirm({
    count: filesToRename.length,
    examples,
    more,
    isPartial: selectedArr.length > 0,
  });
  if (!confirmed) return;

  showLoading('파일 이름 변경 중...');
  setStatus('이름 변경 중...', false);

  try {
    const result = await window.api.renameFiles({
      folderPath: state.currentFolder,
      files: filesToRename,
      prefix,
      digits,
      postfix,
    });
    hideLoading();
    if (result.errors.length) {
      alert('일부 오류:\n' + result.errors.join('\n'));
    } else {
      showToast(`✅ ${result.renamed.length}개 파일 이름 변경 완료!`);
      setStatus(`${result.renamed.length}개 파일 이름 변경 완료`, true);
    }
    const newList = await window.api.listImages(state.currentFolder);
    state.files.length = 0;
    state.files.push(...newList);
    state.selectedIdxs.clear();
    renderGrid();
    history.reset();
    history.pushReorder(state.files);
  } catch (e) {
    hideLoading();
    alert('오류 발생: ' + e.message);
  }
}

function showRenameConfirm({ count, examples, more, isPartial }) {
  renameConfirmSelectedTitle.hidden = !isPartial;
  renameConfirmAllTitle.hidden = isPartial;
  renameConfirmMsg.textContent = `${count}개 파일을 이름 변경합니다. 계속하시겠습니까?`;
  renameConfirmWarning.style.display = isPartial ? 'block' : 'none';

  const items = [...examples];
  if (more) items.push(more);
  renderTextList(renameConfirmList, items);

  openModal(renameConfirmModal);

  return new Promise(resolve => {
    _renameConfirmResolve = resolve;
  });
}

function closeRenameConfirm(confirmed) {
  resolveRenameConfirm(confirmed);
  closeModal(renameConfirmModal);
}

function resolveRenameConfirm(confirmed) {
  if (_renameConfirmResolve) {
    _renameConfirmResolve(confirmed);
    _renameConfirmResolve = null;
  }
}