import {
  buildArweaveDataUrl,
  getArweaveUploadPrice,
  loadArweaveFileMetadata,
  sha256HexFromArrayBuffer,
  uploadArweaveFile,
  validateArweaveTxId,
} from '../services/arweave-file-service.js';
import { addArweaveWalletSecret, getArweaveBalance, getArweaveWalletChoices } from '../services/arweave-wallet-service.js';
import { escapeHtml, formatBytes, normalizeAttachment } from '../services/attachment-format.js';

const HISTORY_KEY = 'shine-ui-arweave-attachment-history-v1';
const MAX_HISTORY_ITEMS = 100;
const RECENT_UPLOAD_MS = 20 * 60 * 1000;

function normalizeHistoryItem(input = {}) {
  const item = normalizeAttachment(input);
  const placedInShineAtMs = Number(input.placedInShineAtMs || 0) || 0;
  return {
    ...item,
    pendingPlacement: input.pendingPlacement === true && !placedInShineAtMs,
    placedInShineAtMs,
  };
}

export function readArweaveAttachmentHistory(login) {
  try {
    const raw = sessionStorage.getItem(HISTORY_KEY);
    const parsed = raw ? JSON.parse(raw) : {};
    const key = String(login || '').trim().toLowerCase();
    const rows = Array.isArray(parsed?.[key]) ? parsed[key] : [];
    return rows.map((item) => normalizeHistoryItem(item)).filter(Boolean);
  } catch {
    return [];
  }
}

export function saveArweaveAttachmentHistory(login, rows) {
  try {
    const key = String(login || '').trim().toLowerCase();
    const raw = sessionStorage.getItem(HISTORY_KEY);
    const parsed = raw ? JSON.parse(raw) : {};
    parsed[key] = (Array.isArray(rows) ? rows : [])
      .map((item) => normalizeHistoryItem(item))
      .slice(0, MAX_HISTORY_ITEMS);
    sessionStorage.setItem(HISTORY_KEY, JSON.stringify(parsed));
  } catch {
    // ignore sessionStorage errors
  }
}

export function clearArweaveAttachmentHistory(login) {
  saveArweaveAttachmentHistory(login, []);
}

export function addArweaveAttachmentToHistory(login, attachment, { pendingPlacement = undefined, markPlaced = false } = {}) {
  const item = normalizeHistoryItem(attachment);
  const rows = readArweaveAttachmentHistory(login);
  const existing = rows.find((row) => row.ar === item.ar) || {};
  const placedInShineAtMs = markPlaced
    ? Date.now()
    : Number(existing.placedInShineAtMs || item.placedInShineAtMs || 0) || 0;
  const nextPendingPlacement = pendingPlacement === undefined
    ? (existing.pendingPlacement === true && !placedInShineAtMs)
    : (!!pendingPlacement && !placedInShineAtMs);
  const nextItem = {
    ...item,
    pendingPlacement: nextPendingPlacement,
    placedInShineAtMs,
  };
  const nextRows = rows.filter((row) => row.ar !== item.ar);
  nextRows.unshift(nextItem);
  saveArweaveAttachmentHistory(login, nextRows);
  return nextItem;
}

export function markArweaveAttachmentPlaced(login, attachment) {
  const item = normalizeHistoryItem(attachment);
  const rows = readArweaveAttachmentHistory(login);
  const existing = rows.find((row) => row.ar === item.ar) || {};
  const nextItem = {
    ...item,
    uploadedAtMs: item.uploadedAtMs || existing.uploadedAtMs || Date.now(),
    pendingPlacement: false,
    placedInShineAtMs: Number(existing.placedInShineAtMs || 0) || Date.now(),
  };
  const nextRows = rows.filter((row) => row.ar !== item.ar);
  nextRows.unshift(nextItem);
  saveArweaveAttachmentHistory(login, nextRows);
  return nextItem;
}

export function formatArweaveHistoryTime(ms) {
  const value = Number(ms || 0);
  if (!Number.isFinite(value) || value <= 0) return '—';
  const diffMs = Date.now() - value;
  if (diffMs >= 0 && diffMs < RECENT_UPLOAD_MS) {
    const minutes = Math.max(1, Math.floor(diffMs / 60000));
    return `${minutes} мин назад`;
  }
  return new Date(value).toLocaleString('ru-RU');
}

export function formatArweaveHistoryDateTime(ms) {
  const value = Number(ms || 0);
  if (!Number.isFinite(value) || value <= 0) return '—';
  return new Date(value).toLocaleString('ru-RU');
}

export async function getArweaveAttachmentAvailability({ gateway, attachment } = {}) {
  const item = normalizeAttachment(attachment);
  const url = buildArweaveDataUrl({ gateway, txId: item.ar });
  try {
    const response = await fetch(url, { method: 'HEAD', cache: 'no-store' });
    if (response.ok) return { status: 'available', label: '✓ Доступен', url };
  } catch {
    // gateway может временно не отвечать или блокировать HEAD; для UI это всё равно недоступно.
  }
  const ageMs = Date.now() - Number(item.uploadedAtMs || 0);
  if (Number.isFinite(ageMs) && ageMs >= 0 && ageMs < RECENT_UPLOAD_MS) {
    return { status: 'pending', label: '… Ещё обновляется', url };
  }
  return { status: 'unavailable', label: '✕ Недоступен', url };
}

function setText(node, text) {
  if (node) node.textContent = String(text || '');
}

function shortAddress(value) {
  const raw = String(value || '').trim();
  if (raw.length <= 16) return raw;
  return `${raw.slice(0, 8)}...${raw.slice(-6)}`;
}

export function openArweaveAttachmentManager({
  login,
  storagePwd,
  gateway,
  onSelect,
  selectedTxIds = [],
  historyOnly = false,
} = {}) {
  const cleanLogin = String(login || '').trim();
  const cleanStoragePwd = String(storagePwd || '').trim();
  const cleanGateway = String(gateway || 'https://arweave.net').trim();
  if (!cleanLogin || !cleanStoragePwd) return Promise.reject(new Error('Нет активной сессии.'));

  const root = document.createElement('div');
  root.className = 'ar-attachment-manager-root';
  document.body.append(root);

  let closed = false;
  let wallets = [];
  let selectedWalletId = 'derived-client-key';
  let selectedFile = null;
  let selectedSha256 = '';
  let priceInfo = null;
  let balanceInfo = null;
  let autoOpenedFileDialog = false;
  const selectedTxIdSet = new Set((Array.isArray(selectedTxIds) ? selectedTxIds : []).map((item) => String(item || '').trim()).filter(Boolean));

  function selectedWallet() {
    return wallets.find((item) => String(item.id) === String(selectedWalletId)) || wallets[0] || null;
  }

  function close(resolve, result = null) {
    if (closed) return;
    closed = true;
    root.remove();
    resolve(result);
  }

  function finish(resolve, attachment, { pendingPlacement = undefined } = {}) {
    const item = addArweaveAttachmentToHistory(cleanLogin, attachment, {
      pendingPlacement,
      markPlaced: false,
    });
    if (!pendingPlacement && typeof onSelect === 'function') onSelect(item);
    close(resolve, item);
  }

  return new Promise((resolve) => {
    const bindBackdrop = () => {
      const modal = root.querySelector('[data-ar-attach-modal="true"]');
      modal?.addEventListener('click', (event) => {
        if (event.target === modal) close(resolve, null);
      });
    };

    const renderWalletOptions = () => wallets.map((wallet) => (
      `<option value="${escapeHtml(wallet.id)}">${escapeHtml(wallet.label)} · ${escapeHtml(shortAddress(wallet.address))}</option>`
    )).join('');

    const loadWallets = async (errorEl = null) => {
      try {
        wallets = await getArweaveWalletChoices({ login: cleanLogin, storagePwd: cleanStoragePwd });
        if (!wallets.some((item) => String(item.id) === String(selectedWalletId))) {
          selectedWalletId = String(wallets[0]?.id || 'derived-client-key');
        }
      } catch (error) {
        setText(errorEl, error?.message || 'Не удалось загрузить Arweave-кошельки.');
      }
    };

    const showUpload = async () => {
      root.innerHTML = `
        <div class="modal" data-ar-attach-modal="true">
          <div class="modal-card stack ar-attachment-manager-card">
            <h3 class="modal-title">${historyOnly ? 'Загрузить файл в блокчейн' : 'Добавить вложение'}</h3>
            <label class="meta-muted" for="ar-attach-wallet">Кошелёк оплаты Arweave</label>
            <select class="input" id="ar-attach-wallet"></select>
            <button class="ghost-btn" type="button" data-action="add-wallet">Добавить кошелёк</button>
            ${historyOnly ? '' : '<p class="meta-muted">Для надёжности лучше сначала загрузить файл в Arweave, дождаться доступности в журнале, а потом добавить его из истории загрузок.</p>'}
            <label class="meta-muted" for="ar-attach-file">Файл для загрузки</label>
            <input class="input" id="ar-attach-file" type="file" />
            <div class="ar-attachment-meta" data-meta="true"></div>
            <p class="meta-muted inline-error" data-error="true"></p>
            <div class="form-actions-grid">
              ${historyOnly ? '' : '<button class="secondary-btn" type="button" data-action="existing">Ввести txId</button>'}
              ${historyOnly ? '' : '<button class="secondary-btn" type="button" data-action="history">История загрузок</button>'}
              <button class="primary-btn" type="button" data-action="upload" disabled>${historyOnly ? 'Загрузить в журнал' : 'Загрузить'}</button>
            </div>
            <button class="secondary-btn" type="button" data-action="cancel">Отмена</button>
          </div>
        </div>
      `;
      bindBackdrop();
      const walletEl = root.querySelector('#ar-attach-wallet');
      const fileEl = root.querySelector('#ar-attach-file');
      const metaEl = root.querySelector('[data-meta="true"]');
      const errorEl = root.querySelector('[data-error="true"]');
      const uploadBtn = root.querySelector('[data-action="upload"]');

      await loadWallets(errorEl);
      if (walletEl) {
        walletEl.innerHTML = renderWalletOptions();
        walletEl.value = selectedWalletId;
        walletEl.addEventListener('change', () => {
          selectedWalletId = String(walletEl.value || '');
          uploadBtn.disabled = true;
          selectedFile = null;
          selectedSha256 = '';
          priceInfo = null;
          balanceInfo = null;
          if (fileEl) fileEl.value = '';
          setText(metaEl, '');
        });
      }

      root.querySelector('[data-action="cancel"]')?.addEventListener('click', () => close(resolve, null));
      root.querySelector('[data-action="existing"]')?.addEventListener('click', showExisting);
      root.querySelector('[data-action="history"]')?.addEventListener('click', showHistory);
      root.querySelector('[data-action="add-wallet"]')?.addEventListener('click', showAddWallet);

      fileEl?.addEventListener('change', async () => {
        selectedFile = fileEl.files?.[0] || null;
        selectedSha256 = '';
        priceInfo = null;
        balanceInfo = null;
        uploadBtn.disabled = true;
        setText(errorEl, '');
        setText(metaEl, '');
        if (!selectedFile) return;

        try {
          const wallet = selectedWallet();
          if (!wallet?.address) throw new Error('Выберите Arweave-кошелёк.');
          const buffer = await selectedFile.arrayBuffer();
          selectedSha256 = await sha256HexFromArrayBuffer(buffer);
          priceInfo = await getArweaveUploadPrice({ gateway: cleanGateway, byteLength: selectedFile.size });
          balanceInfo = await getArweaveBalance({ gateway: cleanGateway, address: wallet.address });
          const hasFunds = BigInt(balanceInfo.winston) >= BigInt(priceInfo.winston);
          metaEl.innerHTML = `
            <div>Имя: ${escapeHtml(selectedFile.name || 'file')}</div>
            <div>Размер: ${escapeHtml(formatBytes(selectedFile.size))}</div>
            <div>SHA-256: ${escapeHtml(selectedSha256)}</div>
            <div>Цена: ${escapeHtml(Number(priceInfo.ar).toLocaleString('ru-RU', { maximumFractionDigits: 6 }))} AR</div>
            <div>Баланс кошелька: ${escapeHtml(Number(balanceInfo.ar).toLocaleString('ru-RU', { maximumFractionDigits: 6 }))} AR</div>
          `;
          if (!hasFunds) {
            setText(errorEl, 'Недостаточно AR на выбранном кошельке.');
            return;
          }
          uploadBtn.disabled = false;
        } catch (error) {
          setText(errorEl, error?.message || 'Не удалось подготовить файл.');
        }
      });

      uploadBtn?.addEventListener('click', async () => {
        if (!selectedFile || !selectedSha256) {
          setText(errorEl, 'Выберите файл.');
          return;
        }
        const wallet = selectedWallet();
        if (!wallet?.jwk) {
          setText(errorEl, 'Выберите Arweave-кошелёк.');
          return;
        }
        uploadBtn.disabled = true;
        setText(errorEl, 'Загружаем файл в Arweave...');
        try {
          const uploaded = await uploadArweaveFile({
            gateway: cleanGateway,
            jwk: wallet.jwk,
            file: selectedFile,
            shineType: 'attachment',
            tags: [
              { name: 'SHiNE-Login', value: cleanLogin },
              { name: 'SHiNE-Attachment-Name', value: selectedFile.name || 'file' },
            ],
          });
          finish(resolve, {
            name: selectedFile.name || 'file',
            size: selectedFile.size,
            sha256: selectedSha256,
            ar: uploaded.id,
            uploadedAtMs: Date.now(),
          }, { pendingPlacement: historyOnly });
        } catch (error) {
          uploadBtn.disabled = false;
          setText(errorEl, error?.message || 'Не удалось загрузить файл в Arweave.');
        }
      });

      if (!autoOpenedFileDialog) {
        autoOpenedFileDialog = true;
        window.setTimeout(() => fileEl?.click(), 0);
      }
    };

    const showExisting = () => {
      root.innerHTML = `
        <div class="modal" data-ar-attach-modal="true">
          <div class="modal-card stack ar-attachment-manager-card">
            <h3 class="modal-title">Существующий файл Arweave</h3>
            <label class="meta-muted" for="ar-existing-txid">Transaction ID</label>
            <input class="input" id="ar-existing-txid" type="text" maxlength="64" placeholder="43 символа txId" />
            <label class="meta-muted" for="ar-existing-name">Имя файла в сообщении</label>
            <input class="input" id="ar-existing-name" type="text" maxlength="180" placeholder="например report.pdf" />
            <div class="ar-attachment-meta" data-meta="true"></div>
            <p class="meta-muted inline-error" data-error="true"></p>
            <div class="form-actions-grid">
              <button class="secondary-btn" type="button" data-action="back">Назад</button>
              <button class="primary-btn" type="button" data-action="check">Скачать и проверить</button>
            </div>
          </div>
        </div>
      `;
      bindBackdrop();
      const txEl = root.querySelector('#ar-existing-txid');
      const nameEl = root.querySelector('#ar-existing-name');
      const metaEl = root.querySelector('[data-meta="true"]');
      const errorEl = root.querySelector('[data-error="true"]');
      const checkBtn = root.querySelector('[data-action="check"]');
      root.querySelector('[data-action="back"]')?.addEventListener('click', showUpload);
      checkBtn?.addEventListener('click', async () => {
        const txId = String(txEl?.value || '').trim();
        const name = String(nameEl?.value || '').trim() || 'arweave-file';
        if (!validateArweaveTxId(txId)) {
          setText(errorEl, 'Некорректный Transaction ID Arweave.');
          return;
        }
        checkBtn.disabled = true;
        setText(errorEl, 'Скачиваем файл и считаем SHA-256...');
        setText(metaEl, '');
        try {
          const meta = await loadArweaveFileMetadata({ gateway: cleanGateway, txId });
          const item = normalizeAttachment({
            name,
            size: meta.sizeBytes,
            sha256: meta.sha256Hex,
            ar: txId,
            uploadedAtMs: Date.now(),
          });
          metaEl.innerHTML = `
            <div>Размер: ${escapeHtml(formatBytes(item.size))}</div>
            <div>SHA-256: ${escapeHtml(item.sha256)}</div>
          `;
          setText(errorEl, '');
          const addBtn = document.createElement('button');
          addBtn.className = 'primary-btn';
          addBtn.type = 'button';
          addBtn.textContent = 'Добавить в сообщение';
          addBtn.addEventListener('click', () => finish(resolve, item));
          metaEl.append(addBtn);
        } catch (error) {
          setText(errorEl, error?.message || 'Не удалось проверить файл Arweave.');
          checkBtn.disabled = false;
        }
      });
      window.setTimeout(() => txEl?.focus(), 0);
    };

    const showHistory = () => {
      const rows = readArweaveAttachmentHistory(cleanLogin).slice().reverse();
      root.innerHTML = `
        <div class="modal" data-ar-attach-modal="true">
          <div class="modal-card stack ar-attachment-manager-card ar-attachment-manager-card--wide">
            <h3 class="modal-title">Журнал загруженных файлов</h3>
            <p class="meta-muted">Журнал хранится только в этой браузерной сессии.</p>
            <div class="ar-attachment-history-tiles" data-history-scroll="true">
              ${rows.length ? rows.map((item, index) => {
                const isSelected = selectedTxIdSet.has(item.ar);
                return `
                  <article class="ar-attachment-history-tile${isSelected ? ' is-selected' : ''}" data-history-tile="${index}">
                    <strong class="ar-attachment-history-name">${escapeHtml(item.name)}</strong>
                    <div class="ar-attachment-history-meta-row">
                      <span>${escapeHtml(formatBytes(item.size))}</span>
                      <span>${escapeHtml(formatArweaveHistoryTime(item.uploadedAtMs))}</span>
                      <span class="ar-attachment-status ar-attachment-status--pending" data-status="${index}">Проверяем...</span>
                      ${item.pendingPlacement ? '<span class="ar-attachment-placement-flag">Не добавлен в SHiNE</span>' : ''}
                    </div>
                    <div class="mono-cell ar-attachment-history-txid">${escapeHtml(item.ar)}</div>
                    <button class="${isSelected ? 'secondary-btn' : 'ghost-btn'}" type="button" data-pick="${index}" ${isSelected ? 'disabled' : ''}>${isSelected ? 'Уже добавлен ✓' : 'Выбрать'}</button>
                  </article>
                `;
              }).join('') : '<div class="card meta-muted">В этой сессии ещё нет загруженных файлов.</div>'}
            </div>
            <div class="form-actions-grid">
              <button class="secondary-btn" type="button" data-action="back">Назад</button>
            </div>
          </div>
        </div>
      `;
      bindBackdrop();
      const scrollEl = root.querySelector('[data-history-scroll="true"]');
      window.setTimeout(() => {
        if (scrollEl) scrollEl.scrollTop = scrollEl.scrollHeight;
      }, 0);
      root.querySelector('[data-action="back"]')?.addEventListener('click', showUpload);
      root.querySelectorAll('[data-pick]').forEach((button) => {
        button.addEventListener('click', () => {
          const index = Number(button.getAttribute('data-pick'));
          const item = rows[index];
          if (item) finish(resolve, item);
        });
      });
      rows.forEach((item, index) => {
        const statusEl = root.querySelector(`[data-status="${index}"]`);
        void getArweaveAttachmentAvailability({ gateway: cleanGateway, attachment: item })
          .then((result) => {
            if (!statusEl) return;
            statusEl.className = `ar-attachment-status ar-attachment-status--${result.status}`;
            statusEl.textContent = result.label;
          })
          .catch(() => {
            if (!statusEl) return;
            statusEl.className = 'ar-attachment-status ar-attachment-status--unavailable';
            statusEl.textContent = 'Недоступен';
          });
      });
    };

    const showAddWallet = () => {
      root.innerHTML = `
        <div class="modal" data-ar-attach-modal="true">
          <div class="modal-card stack ar-attachment-manager-card">
            <h3 class="modal-title">Добавить Arweave-кошелёк</h3>
            <p class="meta-muted">Вставьте JSON JWK или короткую строку base64url(JSON JWK). Ключ будет сохранён в зашифрованном контейнере ключей этого пользователя на устройстве.</p>
            <label class="meta-muted" for="ar-wallet-label">Название</label>
            <input class="input" id="ar-wallet-label" type="text" maxlength="80" placeholder="например Основной AR" />
            <label class="meta-muted" for="ar-wallet-secret">Секрет Arweave</label>
            <textarea class="input" id="ar-wallet-secret" rows="7" placeholder="JSON JWK или base64url(JSON)"></textarea>
            <p class="meta-muted inline-error" data-error="true"></p>
            <div class="form-actions-grid">
              <button class="secondary-btn" type="button" data-action="back">Назад</button>
              <button class="primary-btn" type="button" data-action="save">Добавить</button>
            </div>
          </div>
        </div>
      `;
      bindBackdrop();
      const labelEl = root.querySelector('#ar-wallet-label');
      const secretEl = root.querySelector('#ar-wallet-secret');
      const errorEl = root.querySelector('[data-error="true"]');
      const saveBtn = root.querySelector('[data-action="save"]');
      root.querySelector('[data-action="back"]')?.addEventListener('click', showUpload);
      saveBtn?.addEventListener('click', async () => {
        saveBtn.disabled = true;
        setText(errorEl, '');
        try {
          const wallet = await addArweaveWalletSecret({
            login: cleanLogin,
            storagePwd: cleanStoragePwd,
            label: String(labelEl?.value || '').trim(),
            secret: String(secretEl?.value || '').trim(),
          });
          selectedWalletId = wallet.id;
          await showUpload();
        } catch (error) {
          saveBtn.disabled = false;
          setText(errorEl, error?.message || 'Не удалось добавить Arweave-кошелёк.');
        }
      });
    };

    void showUpload();
  });
}