/* HR Candidate Matcher — Application Entry Point */
/* global window, document, HRMatcher */
(function () {
  'use strict';

  var APP = window.HRMatcher;
  var $ = function (sel) { return document.querySelector(sel); };
  var $$ = function (sel) { return Array.prototype.slice.call(document.querySelectorAll(sel)); };

  var state = APP.createAppState();

  function saveState() {
    var data = {
      currentScreen: state.currentScreen,
      vacancy: state.vacancy,
      resumeText: state.isDemo ? '' : state.resumeText,
      matchResults: state.matchResults,
      isDemo: state.isDemo
    };
    APP.storage.save(data);
  }

  function loadState() {
    var data = APP.storage.load();
    if (!data) return false;
    state.currentScreen = data.currentScreen || 'welcome';
    state.vacancy = data.vacancy || null;
    state.resumeText = data.resumeText || '';
    state.matchResults = data.matchResults || [];
    state.isDemo = data.isDemo || false;
    return true;
  }

  function navigateTo(screen) {
    state.currentScreen = screen;
    APP.ui.showScreen(screen);

    if (screen === 'input') {
      var vacInput = $('#input-vacancy');
      var resInput = $('#input-resume');
      if (vacInput && state.vacancy) vacInput.value = state.vacancy.rawText || '';
      if (resInput) resInput.value = state.resumeText || '';
    } else if (screen === 'criteria') {
      if (state.vacancy) {
        APP.ui.renderCriteriaTable(state.vacancy.criteria || []);
      }
    } else if (screen === 'match') {
      if (state.vacancy) {
        currentFilter = 'all';
        APP.ui.updateFilterChips('all');
        APP.ui.renderMatchTable(state.vacancy.criteria, state.matchResults, 'all');
        APP.ui.renderCoverage(APP.aiAdapter.computeCoverage(state.vacancy.criteria, state.matchResults));
      }
    } else if (screen === 'interview') {
      if (state.vacancy) {
        var interviewData = APP.logic.generateInterviewData(state.vacancy.criteria, state.matchResults);
        APP.ui.renderInterview(interviewData);
      }
    }

    saveState();
  }

  var currentFilter = 'all';

  function bindEvents() {
    var btnStartEmpty = $('#btn-start-empty');
    var btnStartDemo = $('#btn-start-demo');
    var btnBackInput = $('#btn-back-from-input');
    var btnBackCriteria = $('#btn-back-from-criteria');
    var btnBackMatch = $('#btn-back-from-match');
    var btnBackInterview = $('#btn-back-from-interview');
    var formInput = $('#form-input');
    var btnAddCriterion = $('#btn-add-criterion');
    var btnToMatch = $('#btn-to-match');
    var btnToInterview = $('#btn-to-interview');
    var btnViewSource = $('#btn-view-source');
    var btnCloseSource = $('#btn-close-source');
    var btnCopyQuestions = $('#btn-copy-questions');
    var btnExportSummary = $('#btn-export-summary');
    var btnStartOver = $('#btn-start-over');
    var btnClearAll = $('#btn-clear-all');
    var btnConfirmOk = $('#btn-confirm-ok');
    var btnConfirmCancel = $('#btn-confirm-cancel');
    var btnResetFilter = $('#btn-reset-filter');

    if (btnStartEmpty) {
      btnStartEmpty.addEventListener('click', function () {
        state = APP.createAppState();
        state.currentScreen = 'input';
        navigateTo('input');
      });
    }

    if (btnStartDemo) {
      btnStartDemo.addEventListener('click', function () {
        state = APP.createAppState();
        state.isDemo = true;
        state.vacancy = APP.createVacancy('Таргетолог', APP.DEMO_VACANCY_TEXT, []);
        state.resumeText = APP.DEMO_RESUME_TEXT;
        state.vacancy.criteria = APP.aiAdapter.extractRequirements(APP.DEMO_VACANCY_TEXT);
        state.matchResults = APP.logic.runMatch(state.vacancy.criteria, state.resumeText);
        state.currentScreen = 'criteria';
        navigateTo('criteria');
        APP.ui.showToast('Загружен пример. Проверьте критерии.', 'success');
      });
    }

    if (btnBackInput) btnBackInput.addEventListener('click', function () { navigateTo('welcome'); });
    if (btnBackCriteria) btnBackCriteria.addEventListener('click', function () { navigateTo('input'); });
    if (btnBackMatch) btnBackMatch.addEventListener('click', function () { navigateTo('criteria'); });
    if (btnBackInterview) btnBackInterview.addEventListener('click', function () { navigateTo('match'); });

    if (formInput) {
      formInput.addEventListener('submit', function (e) {
        e.preventDefault();
        APP.ui.clearAllErrors();

        var vacancyText = $('#input-vacancy').value;
        var resumeText = $('#input-resume').value;
        var validation = APP.logic.validateInput(vacancyText, resumeText);

        if (!validation.valid) {
          if (validation.errors.vacancy) {
            APP.ui.showError('vacancy', validation.errors.vacancy);
            $('#input-vacancy').focus();
          } else if (validation.errors.resume) {
            APP.ui.showError('resume', validation.errors.resume);
            $('#input-resume').focus();
          }
          return;
        }

        var title = vacancyText.split('\n')[0].substring(0, 80).trim();
        state.vacancy = APP.createVacancy(title, vacancyText, []);
        state.resumeText = resumeText;
        state.isDemo = false;
        state.vacancy.criteria = APP.aiAdapter.extractRequirements(vacancyText);
        state.matchResults = APP.logic.runMatch(state.vacancy.criteria, resumeText);

        navigateTo('criteria');
        APP.ui.showToast('Извлечено требований: ' + state.vacancy.criteria.length, 'success');
      });
    }

    if (btnAddCriterion) {
      btnAddCriterion.addEventListener('click', function () {
        var criteria = APP.ui.readCriteriaFromTable();
        criteria.push(APP.createCriterion('', true, 3, []));
        state.vacancy.criteria = criteria;
        APP.ui.renderCriteriaTable(criteria);
        var rows = $$('#criteria-tbody tr');
        var lastRow = rows[rows.length - 1];
        if (lastRow) {
          var input = lastRow.querySelector('[data-field="label"]');
          if (input) input.focus();
        }
      });
    }

    if (btnToMatch) {
      btnToMatch.addEventListener('click', function () {
        var criteria = APP.ui.readCriteriaFromTable();
        var validation = APP.logic.validateCriteria(criteria);
        if (!validation.valid) {
          APP.ui.showToast(validation.message, 'error');
          return;
        }
        state.vacancy.criteria = criteria;
        state.matchResults = APP.logic.runMatch(criteria, state.resumeText);
        navigateTo('match');
      });
    }

    var criteriaTbody = $('#criteria-tbody');
    if (criteriaTbody) {
      criteriaTbody.addEventListener('click', function (e) {
        var btn = e.target.closest('[data-action="delete-criterion"]');
        if (!btn) return;
        var row = btn.closest('tr');
        if (!row) return;
        var id = row.getAttribute('data-id');
        var criteria = APP.ui.readCriteriaFromTable();
        var label = '';
        for (var i = 0; i < criteria.length; i++) {
          if (criteria[i].id === id) { label = criteria[i].label; break; }
        }
        APP.ui.showConfirm('Удалить требование' + (label ? ' «' + label + '»' : '') + '?', function () {
          var updated = criteria.filter(function (c) { return c.id !== id; });
          state.vacancy.criteria = updated;
          APP.ui.renderCriteriaTable(updated);
          APP.ui.hideConfirm();
        });
      });
    }

    var matchTbody = $('#match-tbody');
    if (matchTbody) {
      matchTbody.addEventListener('change', function (e) {
        var target = e.target;
        var row = target.closest('tr');
        if (!row) return;
        var criterionId = row.getAttribute('data-criterion-id');

        if (target.getAttribute('data-action') === 'change-status') {
          for (var i = 0; i < state.matchResults.length; i++) {
            if (state.matchResults[i].criterionId === criterionId) {
              state.matchResults[i].status = target.value;
              break;
            }
          }
          APP.ui.renderCoverage(APP.aiAdapter.computeCoverage(state.vacancy.criteria, state.matchResults));
          saveState();
        }
      });

      matchTbody.addEventListener('input', function (e) {
        var target = e.target;
        if (target.getAttribute('data-action') !== 'change-note') return;
        var row = target.closest('tr');
        if (!row) return;
        var criterionId = row.getAttribute('data-criterion-id');
        for (var i = 0; i < state.matchResults.length; i++) {
          if (state.matchResults[i].criterionId === criterionId) {
            state.matchResults[i].note = target.value;
            break;
          }
        }
        saveState();
      });
    }

    var filterBar = $('#match-filter-bar');
    if (filterBar) {
      filterBar.addEventListener('click', function (e) {
        var chip = e.target.closest('.chip');
        if (!chip) return;
        currentFilter = chip.getAttribute('data-filter') || 'all';
        APP.ui.updateFilterChips(currentFilter);
        APP.ui.renderMatchTable(state.vacancy.criteria, state.matchResults, currentFilter);
      });
    }

    if (btnResetFilter) {
      btnResetFilter.addEventListener('click', function () {
        currentFilter = 'all';
        APP.ui.updateFilterChips('all');
        APP.ui.renderMatchTable(state.vacancy.criteria, state.matchResults, 'all');
      });
    }

    if (btnToInterview) {
      btnToInterview.addEventListener('click', function () {
        navigateTo('interview');
      });
    }

    if (btnViewSource) {
      btnViewSource.addEventListener('click', function () {
        var modal = $('#modal-source');
        var vacSource = $('#source-vacancy');
        var resSource = $('#source-resume');
        if (vacSource) vacSource.textContent = state.vacancy ? state.vacancy.rawText : '';
        if (resSource) resSource.textContent = state.resumeText || '';
        if (modal) modal.hidden = false;
      });
    }

    if (btnCloseSource) {
      btnCloseSource.addEventListener('click', function () {
        var modal = $('#modal-source');
        if (modal) modal.hidden = true;
      });
    }

    if (btnCopyQuestions) {
      btnCopyQuestions.addEventListener('click', function () {
        var interviewData = APP.logic.generateInterviewData(state.vacancy.criteria, state.matchResults);
        if (interviewData.length === 0) {
          APP.ui.showToast('Нет вопросов для копирования', 'error');
          return;
        }
        var text = '';
        var num = 1;
        interviewData.forEach(function (section) {
          text += section.criterion.label + ':\n';
          section.questions.forEach(function (q) {
            text += num + '. ' + q + '\n';
            num++;
          });
          text += '\n';
        });
        copyToClipboard(text.trim());
      });
    }

    if (btnExportSummary) {
      btnExportSummary.addEventListener('click', function () {
        var summary = APP.logic.exportSummary(state.vacancy, state.vacancy.criteria, state.matchResults);
        downloadFile('candidate-summary.txt', summary, 'text/plain;charset=utf-8');
        APP.ui.showToast('Сводка экспортирована', 'success');
      });
    }

    if (btnStartOver) {
      btnStartOver.addEventListener('click', function () {
        APP.ui.showConfirm('Начать заново? Текущие данные будут очищены.', function () {
          state = APP.createAppState();
          APP.storage.clear();
          navigateTo('welcome');
          APP.ui.hideConfirm();
        });
      });
    }

    if (btnClearAll) {
      btnClearAll.addEventListener('click', function () {
        APP.ui.showConfirm('Очистить все данные? Это действие нельзя отменить.', function () {
          state = APP.createAppState();
          APP.storage.clear();
          navigateTo('welcome');
          APP.ui.hideConfirm();
          APP.ui.showToast('Все данные очищены', 'success');
        });
      });
    }

    if (btnConfirmOk) {
      btnConfirmOk.addEventListener('click', function () {
        APP.ui.resolveConfirm();
      });
    }

    if (btnConfirmCancel) {
      btnConfirmCancel.addEventListener('click', function () {
        APP.ui.hideConfirm();
      });
    }

    document.addEventListener('keydown', function (e) {
      if (e.key === 'Escape') {
        var sourceModal = $('#modal-source');
        var confirmModal = $('#modal-confirm');
        if (sourceModal && !sourceModal.hidden) {
          sourceModal.hidden = true;
        } else if (confirmModal && !confirmModal.hidden) {
          APP.ui.hideConfirm();
        }
      }
    });

    var sourceModal = $('#modal-source');
    if (sourceModal) {
      sourceModal.addEventListener('click', function (e) {
        if (e.target === sourceModal) sourceModal.hidden = true;
      });
    }
    var confirmModal = $('#modal-confirm');
    if (confirmModal) {
      confirmModal.addEventListener('click', function (e) {
        if (e.target === confirmModal) APP.ui.hideConfirm();
      });
    }

    window.addEventListener('beforeunload', function () {
      if (state.currentScreen !== 'welcome' && !state.isDemo) {
        saveState();
      }
    });
  }

  function copyToClipboard(text) {
    if (navigator.clipboard && navigator.clipboard.writeText) {
      navigator.clipboard.writeText(text).then(function () {
        APP.ui.showToast('Скопировано в буфер обмена', 'success');
      }).catch(function () {
        fallbackCopy(text);
      });
    } else {
      fallbackCopy(text);
    }
  }

  function fallbackCopy(text) {
    var ta = document.createElement('textarea');
    ta.value = text;
    ta.style.position = 'fixed';
    ta.style.left = '-9999px';
    document.body.appendChild(ta);
    ta.select();
    try {
      document.execCommand('copy');
      APP.ui.showToast('Скопировано в буфер обмена', 'success');
    } catch (e) {
      APP.ui.showToast('Не удалось скопировать. Выделите текст вручную.', 'error');
    }
    document.body.removeChild(ta);
  }

  function downloadFile(filename, content, mimeType) {
    var blob = new Blob([content], { type: mimeType });
    var url = URL.createObjectURL(blob);
    var a = document.createElement('a');
    a.href = url;
    a.download = filename;
    a.style.display = 'none';
    document.body.appendChild(a);
    a.click();
    setTimeout(function () {
      URL.revokeObjectURL(url);
      document.body.removeChild(a);
    }, 100);
  }

  function init() {
    bindEvents();

    var hasSaved = loadState();
    if (hasSaved && state.currentScreen !== 'welcome') {
      navigateTo(state.currentScreen);
      if (state.isDemo) {
        APP.ui.showToast('Загружены данные примера', 'success');
      }
    } else {
      APP.ui.showScreen('welcome');
    }
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();