const state = {
  containers: [],
  profiles: [],
  activeRuns: new Map(),
};

const elements = {
  containerCount: document.querySelector('#containerCount'),
  profileCount: document.querySelector('#profileCount'),
  profileForm: document.querySelector('#profileForm'),
  profileId: document.querySelector('#profileId'),
  profileName: document.querySelector('#profileName'),
  backupDir: document.querySelector('#backupDir'),
  containerOptions: document.querySelector('#containerOptions'),
  profilesList: document.querySelector('#profilesList'),
  formModeBadge: document.querySelector('#formModeBadge'),
  toast: document.querySelector('#toast'),
  restoreModal: document.querySelector('#restoreModal'),
  restoreModalSubtitle: document.querySelector('#restoreModalSubtitle'),
  restoreContainerOptions: document.querySelector('#restoreContainerOptions'),
  restoreModalConfirm: document.querySelector('#restoreModalConfirm'),
  restoreModalClose: document.querySelector('#restoreModalClose'),
  restoreModalSelectAll: document.querySelector('#restoreModalSelectAll'),
};

async function api(path, options = {}) {
  const response = await fetch(path, {
    headers: {
      'Content-Type': 'application/json',
      ...(options.headers || {}),
    },
    ...options,
  });

  if (response.status === 204) {
    return null;
  }

  const payload = await response.json();
  if (!response.ok) {
    throw new Error(payload.error || 'Falha na requisicao');
  }

  return payload;
}

function escapeHtml(value) {
  return String(value ?? '')
    .replaceAll('&', '&')
    .replaceAll('<', '&lt;')
    .replaceAll('>', '&gt;')
    .replaceAll('"', '&quot;')
    .replaceAll("'", '&#39;');
}

function showToast(message, isError = false) {
  elements.toast.textContent = message;
  elements.toast.classList.remove('hidden', 'error');
  if (isError) {
    elements.toast.classList.add('error');
  }

  window.clearTimeout(showToast.timer);
  showToast.timer = window.setTimeout(() => {
    elements.toast.classList.add('hidden');
  }, 3200);
}

function getSelectedContainerIds() {
  return [...document.querySelectorAll('input[name="containerIds"]:checked')].map((input) => input.value);
}

function renderContainers() {
  elements.containerCount.textContent = String(state.containers.length);

  if (!state.containers.length) {
    elements.containerOptions.innerHTML = '<p class="empty-state">Nenhum container encontrado.</p>';
    return;
  }

  const selected = new Set(getSelectedContainerIds());
  elements.containerOptions.innerHTML = state.containers.map((container) => `
    <label class="container-option">
      <input type="checkbox" name="containerIds" value="${escapeHtml(container.id)}" ${selected.has(container.id) ? 'checked' : ''} />
      <span>
        <strong>${escapeHtml(container.name)}</strong>
        <small>${escapeHtml(container.image)} · ${escapeHtml(container.status)}</small>
      </span>
      <em class="state ${escapeHtml(container.state)}">${escapeHtml(container.state)}</em>
    </label>
  `).join('');
}

function backupButtons(profile) {
  const isRunning = state.activeRuns.has(profile.id);
  return `
    <div class="run-actions">
      <label class="mode-picker" for="runMode-${escapeHtml(profile.id)}">
        <span>Modo do backup</span>
        <select id="runMode-${escapeHtml(profile.id)}" data-run-mode="${escapeHtml(profile.id)}" class="mode-select" ${isRunning ? 'disabled' : ''}>
          <option value="full">Full</option>
          <option value="incremental">Incremental</option>
        </select>
      </label>
      <div class="card-actions">
        <button data-action="run" data-profile-id="${escapeHtml(profile.id)}" class="primary-button small" ${isRunning ? 'disabled' : ''}>${isRunning ? 'Executando...' : 'Run'}</button>
        <button data-action="edit" data-profile-id="${escapeHtml(profile.id)}" class="secondary-button small">Editar</button>
        <button data-action="delete" data-profile-id="${escapeHtml(profile.id)}" class="ghost-button small">Excluir</button>
      </div>
    </div>
  `;
}

function getRunMode(profileId) {
  const selector = document.querySelector(`select[data-run-mode="${profileId}"]`);
  const value = selector?.value;
  return value === 'incremental' ? 'incremental' : 'full';
}

function getProfileScopeLabel(scope) {
  return scope === 'container' ? 'container inteiro' : 'somente volumes';
}

function askRestoreContainerSelection(profile, backup) {
  const restorable = (backup.containers || []).filter((item) => item.status === 'ok');
  if (!restorable.length) {
    throw new Error('Nao ha containers validos neste backup para restaurar.');
  }

  elements.restoreModalSubtitle.textContent = `${profile.name} - ${new Date(backup.createdAt).toLocaleString('pt-BR')}`;
  elements.restoreContainerOptions.innerHTML = restorable.map((item) => `
    <label class="modal-option">
      <input type="checkbox" name="restoreContainerIds" value="${escapeHtml(item.containerId)}" checked />
      <span>
        <strong>${escapeHtml(item.containerName)}</strong>
        <small>${escapeHtml(item.status)}</small>
      </span>
    </label>
  `).join('');

  elements.restoreModal.classList.remove('hidden');
  elements.restoreModal.setAttribute('aria-hidden', 'false');

  return new Promise((resolve, reject) => {
    const closeModal = () => {
      elements.restoreModal.classList.add('hidden');
      elements.restoreModal.setAttribute('aria-hidden', 'true');
      elements.restoreContainerOptions.innerHTML = '';
    };

    const cleanup = () => {
      elements.restoreModalConfirm.removeEventListener('click', onConfirm);
      elements.restoreModalClose.removeEventListener('click', onCancel);
      elements.restoreModalSelectAll.removeEventListener('click', onSelectAll);
      elements.restoreModal.removeEventListener('click', onBackdropClick);
    };

    const onConfirm = () => {
      const selected = [...elements.restoreContainerOptions.querySelectorAll('input[name="restoreContainerIds"]:checked')]
        .map((input) => input.value);

      if (!selected.length) {
        showToast('Selecione ao menos um container para restaurar.', true);
        return;
      }

      cleanup();
      closeModal();
      resolve(selected);
    };

    const onCancel = () => {
      cleanup();
      closeModal();
      resolve(null);
    };

    const onSelectAll = () => {
      for (const input of elements.restoreContainerOptions.querySelectorAll('input[name="restoreContainerIds"]')) {
        input.checked = true;
      }
    };

    const onBackdropClick = (event) => {
      const closeTrigger = event.target.closest('[data-action="close-restore-modal"]');
      if (closeTrigger) {
        onCancel();
      }
    };

    elements.restoreModalConfirm.addEventListener('click', onConfirm);
    elements.restoreModalClose.addEventListener('click', onCancel);
    elements.restoreModalSelectAll.addEventListener('click', onSelectAll);
    elements.restoreModal.addEventListener('click', onBackdropClick);
  });
}

function formatBackupFailures(backup) {
  const failures = (backup.containers || []).filter((item) => item.status === 'error');
  if (!failures.length) {
    return '';
  }

  return `
    <small class="backup-error">
      Falhas: ${failures.map((item) => `${escapeHtml(item.containerName || item.containerId || 'container')}: ${escapeHtml(item.error || 'erro desconhecido')}`).join(' | ')}
    </small>
  `;
}

function progressBar(percent) {
  const normalized = Math.max(0, Math.min(100, Number(percent) || 0));
  return `
    <div class="progress-track" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="${normalized}">
      <span class="progress-fill" style="width: ${normalized}%;"></span>
    </div>
  `;
}

function renderRunProgress(profileId) {
  const run = state.activeRuns.get(profileId);
  const host = document.querySelector(`[data-run-progress="${profileId}"]`);
  if (!host) {
    return;
  }

  if (!run || !run.progress) {
    host.innerHTML = '';
    host.classList.add('hidden');
    return;
  }

  const overall = run.progress.overall || { total: 0, completed: 0, pending: 0, percent: 0 };
  const currentContainer = run.progress.currentContainer;
  const file = currentContainer?.file || { current: 0, total: 0, percent: 0, currentFile: null };
  const containerPercent = Number.isFinite(currentContainer?.percent) ? currentContainer.percent : 0;
  const stepLabel = currentContainer?.step || 'aguardando';
  const stepMessage = currentContainer?.message || 'Aguardando processamento de arquivo...';
  const logs = Array.isArray(currentContainer?.logs) ? currentContainer.logs.slice(-8) : [];
  const operation = run?.kind === 'restore' || run?.progress?.operation === 'restore' ? 'restore' : 'backup';
  const operationTitle = operation === 'restore' ? 'Progresso do restore' : 'Progresso do backup';

  host.classList.remove('hidden');
  host.innerHTML = `
    <div class="progress-card">
      <div class="progress-header">
        <strong>${escapeHtml(operationTitle)}</strong>
        <small>${escapeHtml(run.status)}</small>
      </div>

      <div class="progress-block">
        <div class="progress-label-row">
          <span>Containers: ${escapeHtml(String(overall.completed))}/${escapeHtml(String(overall.total))} concluido(s)</span>
          <span>Faltam ${escapeHtml(String(overall.pending))}</span>
        </div>
        ${progressBar(overall.percent)}
      </div>

      <div class="progress-block">
        <div class="progress-label-row">
          <span>Container atual: ${escapeHtml(currentContainer?.containerName || currentContainer?.containerId || '-')}</span>
          <span>${escapeHtml(String(Math.round(containerPercent)))}%</span>
        </div>
        ${progressBar(containerPercent)}
      </div>

      <div class="progress-block">
        <div class="progress-label-row">
          <span>Arquivos: ${escapeHtml(String(file.current || 0))}/${escapeHtml(String(file.total || 0))}</span>
          <span>${escapeHtml(String(Math.round(file.percent || 0)))}%</span>
        </div>
        ${progressBar(file.percent || 0)}
        <small class="current-file">Etapa: ${escapeHtml(stepLabel)} · ${escapeHtml(file.currentFile || stepMessage)}</small>
      </div>

      <div class="progress-block">
        <div class="progress-label-row">
          <span>Log detalhado</span>
          <span>${escapeHtml(String(logs.length))} evento(s)</span>
        </div>
        <div class="progress-log">
          ${logs.length
    ? logs.map((line) => `<small>${escapeHtml(line)}</small>`).join('')
    : '<small>Nenhum evento detalhado ainda.</small>'}
        </div>
      </div>
    </div>
  `;
}

function renderAllRunProgress() {
  for (const profile of state.profiles) {
    renderRunProgress(profile.id);
  }
}

async function pollRun(profileId, runId) {
  const doneStatus = new Set(['completed', 'completed-with-errors', 'error']);

  while (true) {
    const run = await api(`/api/runs/${runId}`);
    state.activeRuns.set(profileId, run);
    renderRunProgress(profileId);

    if (doneStatus.has(run.status)) {
      return run;
    }

    await new Promise((resolve) => {
      window.setTimeout(resolve, 700);
    });
  }
}

function restoreButtons(profile, backups) {
  if (!backups.length) {
    return '<p class="empty-inline">Nenhum backup executado ainda.</p>';
  }

  return `
    <div class="backup-history">
      ${backups.map((backup) => `
        <button
          class="backup-item"
          data-action="restore"
          data-profile-id="${escapeHtml(profile.id)}"
          data-backup-id="${escapeHtml(backup.id)}"
        >
          <span>
            <strong>${escapeHtml(new Date(backup.createdAt).toLocaleString('pt-BR'))}</strong>
            <small>${escapeHtml(backup.mode)} · ${escapeHtml(getProfileScopeLabel(backup.backupScope))} · ${escapeHtml(backup.status)} · ${escapeHtml(backup.containers.map((item) => item.containerName).join(', '))}</small>
            ${formatBackupFailures(backup)}
          </span>
          <em>Restore</em>
        </button>
      `).join('')}
    </div>
  `;
}

async function renderProfiles() {
  elements.profileCount.textContent = String(state.profiles.length);

  if (!state.profiles.length) {
    elements.profilesList.innerHTML = '<p class="empty-state">Nenhum profile salvo.</p>';
    return;
  }

  const backupsByProfile = await Promise.all(
    state.profiles.map(async (profile) => [profile.id, await api(`/api/profiles/${profile.id}/backups`)])
  );
  const backupMap = new Map(backupsByProfile);

  elements.profilesList.innerHTML = state.profiles.map((profile) => `
    <article class="profile-card">
      <div class="profile-card-top">
        <div>
          <h3>${escapeHtml(profile.name)}</h3>
          <p>${escapeHtml(String(profile.containerIds.length))} container(es) · ${escapeHtml(getProfileScopeLabel(profile.backupScope))}</p>
          <code>${escapeHtml(profile.backupDir)}</code>
        </div>
        ${backupButtons(profile)}
      </div>
      <div class="chips">
        ${profile.containerIds.map((containerId) => {
          const container = state.containers.find((item) => item.id === containerId);
          return `<span class="chip">${escapeHtml(container ? container.name : containerId.slice(0, 12))}</span>`;
        }).join('')}
      </div>
      <div class="run-progress hidden" data-run-progress="${escapeHtml(profile.id)}"></div>
      <div class="restore-block">
        <h4>Restaurar</h4>
        ${restoreButtons(profile, backupMap.get(profile.id) || [])}
      </div>
    </article>
  `).join('');

  renderAllRunProgress();
}

function resetForm() {
  elements.profileForm.reset();
  elements.profileId.value = '';
  elements.formModeBadge.textContent = 'criar';
  renderContainers();
}

function fillForm(profile) {
  elements.profileId.value = profile.id;
  elements.profileName.value = profile.name;
  elements.backupDir.value = profile.backupDir;
  const backupScope = profile.backupScope === 'container' ? 'container' : 'volumes';
  document.querySelector(`input[name="backupScope"][value="${backupScope}"]`).checked = true;
  elements.formModeBadge.textContent = 'editar';
  renderContainers();
  for (const containerId of profile.containerIds) {
    const input = document.querySelector(`input[name="containerIds"][value="${containerId}"]`);
    if (input) {
      input.checked = true;
    }
  }
  window.scrollTo({ top: 0, behavior: 'smooth' });
}

async function loadContainers() {
  state.containers = await api('/api/containers');
  renderContainers();
}

async function loadProfiles() {
  state.profiles = await api('/api/profiles');
  await renderProfiles();
}

async function saveProfile(event) {
  event.preventDefault();
  const payload = {
    id: elements.profileId.value || undefined,
    name: elements.profileName.value,
    backupDir: elements.backupDir.value,
    containerIds: getSelectedContainerIds(),
    backupScope: document.querySelector('input[name="backupScope"]:checked').value,
  };

  try {
    await api('/api/profiles', {
      method: 'POST',
      body: JSON.stringify(payload),
    });
    await loadProfiles();
    resetForm();
    showToast('Profile salvo.');
  } catch (error) {
    showToast(error.message, true);
  }
}

async function handleProfileAction(event) {
  const button = event.target.closest('button[data-action]');
  if (!button) {
    return;
  }

  const { action, profileId, backupId } = button.dataset;
  const profile = state.profiles.find((item) => item.id === profileId);
  if (!profile) {
    return;
  }

  try {
    if (action === 'edit') {
      fillForm(profile);
      return;
    }

    if (action === 'delete') {
      if (!window.confirm(`Excluir o profile ${profile.name}?`)) {
        return;
      }
      await api(`/api/profiles/${profileId}`, { method: 'DELETE' });
      await loadProfiles();
      showToast('Profile removido.');
      return;
    }

    if (action === 'run') {
      button.disabled = true;
      button.textContent = 'Executando...';
      const mode = getRunMode(profileId);

      const start = await api(`/api/profiles/${profileId}/run`, { method: 'POST', body: JSON.stringify({ mode }) });
      state.activeRuns.set(profileId, {
        id: start.runId,
        profileId,
        status: 'running',
        progress: {
          overall: { total: profile.containerIds.length, completed: 0, pending: profile.containerIds.length, percent: 0 },
          currentContainer: null,
        },
      });
      renderRunProgress(profileId);

      const run = await pollRun(profileId, start.runId);
      state.activeRuns.delete(profileId);
      await loadProfiles();
      if (run.status === 'error') {
        showToast(run.error || 'Falha durante a execucao do backup.', true);
      } else {
        const backupStatus = run.result?.status;
        const failures = (run.result?.containers || []).filter((item) => item.status === 'error');
        if (failures.length) {
          const details = failures
            .map((item) => `${item.containerName || item.containerId || 'container'}: ${item.error || 'erro desconhecido'}`)
            .join(' | ');
          showToast(`Backup com falhas. ${details}`, true);
        } else {
          showToast(
            backupStatus === 'ok' ? 'Backup concluido.' : 'Backup concluido com falhas parciais.',
            backupStatus !== 'ok',
          );
        }
      }
      return;
    }

    if (action === 'restore') {
      if (!window.confirm(`Restaurar o backup selecionado para o profile ${profile.name}?`)) {
        return;
      }

      const backups = await api(`/api/profiles/${profileId}/backups`);
      const selectedBackup = backups.find((item) => item.id === backupId);
      if (!selectedBackup) {
        throw new Error('Backup selecionado nao encontrado.');
      }

      const selectedContainerIds = await askRestoreContainerSelection(profile, selectedBackup);
      if (!selectedContainerIds) {
        return;
      }

      button.disabled = true;
      button.textContent = 'Restaurando...';

      const start = await api(`/api/profiles/${profileId}/restore`, {
        method: 'POST',
        body: JSON.stringify({ backupId, containerIds: selectedContainerIds }),
      });
      state.activeRuns.set(profileId, {
        id: start.runId,
        kind: 'restore',
        profileId,
        status: 'running',
        progress: {
          operation: 'restore',
          overall: {
            total: selectedContainerIds.length,
            completed: 0,
            pending: selectedContainerIds.length,
            percent: 0,
          },
          currentContainer: null,
        },
      });
      renderRunProgress(profileId);

      const run = await pollRun(profileId, start.runId);
      state.activeRuns.delete(profileId);
      await loadProfiles();

      if (run.status === 'error') {
        showToast(run.error || 'Falha durante a execucao do restore.', true);
      } else {
        const restoreStatus = run.result?.status;
        const restoreStatsLines = (run.result?.containers || [])
          .filter((item) => item.status === 'ok' && item.stats)
          .map((item) => `${item.containerName}: apagados ${item.stats.deleted}, criados ${item.stats.created}, modificados ${item.stats.modified}`);

        const failures = (run.result?.containers || []).filter((item) => item.status === 'error');
        if (failures.length) {
          const details = failures
            .map((item) => `${item.containerName || item.containerId || 'container'}: ${item.error || 'erro desconhecido'}`)
            .join(' | ');
          const statsSummary = restoreStatsLines.length ? ` ${restoreStatsLines.join(' | ')}` : '';
          showToast(`Restore com falhas. ${details}.${statsSummary}`, true);
        } else {
          const summary = restoreStatsLines.length ? ` ${restoreStatsLines.join(' | ')}` : '';
          showToast(
            `${restoreStatus === 'ok' ? 'Restore concluido.' : 'Restore concluido com falhas parciais.'}${summary}`,
            restoreStatus !== 'ok',
          );
        }
      }
    }
  } catch (error) {
    showToast(error.message, true);
  } finally {
    button.disabled = false;
  }
}

async function init() {
  try {
    await Promise.all([loadContainers(), loadProfiles()]);
  } catch (error) {
    showToast(error.message, true);
  }
}

elements.profileForm.addEventListener('submit', saveProfile);
document.querySelector('#refreshContainers').addEventListener('click', init);
document.querySelector('#reloadProfiles').addEventListener('click', loadProfiles);
document.querySelector('#clearForm').addEventListener('click', resetForm);
elements.profilesList.addEventListener('click', handleProfileAction);

init();