import { getHistory } from './history.ts';
import { execute } from './sqlite-manager.ts';

export interface HistoryViewCallbacks {
  onBack: () => void;
}

let allRecords: any[] = [];
let showBadOnly = false;

const BAD_MODES = new Set(['hard', 'none']);

/**
 * Показывает страницу истории повторений для указанной колоды.
 */
export async function renderHistoryView(
  container: HTMLElement,
  setId: number,
  callbacks: HistoryViewCallbacks,
): Promise<void> {
  showBadOnly = false;

  container.innerHTML = `
    <div class="history-header">
      <button id="btnHistoryBack" class="btn" style="flex:none; padding:0.4rem 0.8rem;">← Назад</button>
      <span style="font-size:0.85rem;color:var(--text);">Загрузка...</span>
    </div>
    <div class="history-filters">
      <button id="btnFilterAll" class="btn btn-filter active">📊 Все записи</button>
      <button id="btnFilterBad" class="btn btn-filter">🔴 Только плохие</button>
    </div>
    <div class="history-card">
      <div id="history-content" style="text-align:center;padding:2rem;opacity:0.6;">Загрузка истории...</div>
    </div>
  `;

  document.getElementById('btnHistoryBack')?.addEventListener('click', () => {
    callbacks.onBack();
  });

  document.getElementById('btnFilterAll')?.addEventListener('click', () => {
    showBadOnly = false;
    updateFilterButtons();
    renderRows(container);
  });

  document.getElementById('btnFilterBad')?.addEventListener('click', () => {
    showBadOnly = true;
    updateFilterButtons();
    renderRows(container);
  });

  try {
    allRecords = await getHistory(setId, 2000);

    const wordIds = [...new Set(allRecords.map((r) => r.word_id))];
    const wordMap = await getWordMap(wordIds);

    // Сохраняем wordMap для renderRows
    (window as any).__wordMap = wordMap;

    const headerSpan = container.querySelector('.history-header span');
    if (headerSpan) {
      headerSpan.textContent = `всего записей: ${allRecords.length}`;
    }

    renderRows(container);
  } catch (err) {
    console.error('[History] Ошибка загрузки:', err);
    const contentEl = document.getElementById('history-content');
    if (contentEl) {
      contentEl.innerHTML = '<div style="text-align:center;padding:2rem;color:var(--error);">Ошибка загрузки истории</div>';
    }
  }
}

function updateFilterButtons() {
  const btnAll = document.getElementById('btnFilterAll');
  const btnBad = document.getElementById('btnFilterBad');
  if (btnAll && btnBad) {
    btnAll.classList.toggle('active', !showBadOnly);
    btnBad.classList.toggle('active', showBadOnly);
  }
}

function renderRows(container: HTMLElement) {
  const contentEl = document.getElementById('history-content');
  if (!contentEl) return;

  const wordMap = (window as any).__wordMap as Map<number, string> || new Map();
  const headerSpan = container.querySelector('.history-header span');

  let filtered = allRecords;
  if (showBadOnly) {
    filtered = allRecords.filter((r) => BAD_MODES.has(r.mode));
  }

  if (headerSpan) {
    headerSpan.textContent = showBadOnly
      ? `плохих: ${filtered.length} / ${allRecords.length}`
      : `всего записей: ${allRecords.length}`;
  }

  if (filtered.length === 0) {
    contentEl.innerHTML = '<div style="text-align:center;padding:2rem;opacity:0.6;">Нет записей</div>';
    return;
  }

  contentEl.innerHTML = '';

  for (const record of filtered) {
    const word = wordMap.get(record.word_id);
    const wordText = word ? word : `#${record.word_id}`;
    const date = new Date(record.timestamp);
    const dateStr = date.toLocaleString('ru-RU', {
      day: '2-digit',
      month: '2-digit',
      hour: '2-digit',
      minute: '2-digit',
    });

    const modeLabels: Record<string, string> = {
      easy: '🟢 Легко',
      ok: '🟡 Нормально',
      hard: '🟠 Тяжело',
      none: '🔴 Не знаю',
    };

    const row = document.createElement('div');
    row.className = 'history-row';
    row.innerHTML = `
      <div class="history-row-word">${escapeHtml(wordText)}</div>
      <div class="history-row-mode">${modeLabels[record.mode] || record.mode}</div>
      <div class="history-row-scores">
        <span class="history-score-before">${record.score_before.toFixed(1)}</span>
        <span class="history-score-arrow">→</span>
        <span class="history-score-after">${record.score_after.toFixed(1)}</span>
      </div>
      <div class="history-row-date">${dateStr}</div>
    `;
    contentEl.appendChild(row);
  }
}

async function getWordMap(wordIds: number[]): Promise<Map<number, string>> {
  const map = new Map<number, string>();
  if (wordIds.length === 0) return map;

  try {
    const placeholders = wordIds.map(() => '?').join(',');
    const rows: any[] = await execute(
      `SELECT id, key FROM words WHERE id IN (${placeholders})`,
      wordIds,
    );
    for (const row of rows) {
      map.set(row[0], row[1]);
    }
  } catch {
    // ignore
  }
  return map;
}

function escapeHtml(text: string): string {
  const div = document.createElement('div');
  div.textContent = text;
  return div.innerHTML;
}