/**
 * javascript/compose.js
 *
 * Compose panel: project list + an editable YAML view + save/up/down/pull/
 * delete, backed by ajax/compose.php. See that file's header comment —
 * this is the one panel whose backend shells out to the `podman compose`
 * CLI, because no REST equivalent for Compose exists in libpod.
 */
(function () {
  'use strict';
  const P = window.Podman;
  let projects = [];
  let selected = null;

  const STARTER_YAML =
    'services:\n' +
    '  app:\n' +
    '    image: docker.io/library/nginx:alpine\n' +
    '    ports:\n' +
    '      - "8080:80"\n';

  function statusChip(status) {
    const cls = status === 'up' ? 'podman-chip-good' : (status === 'down' ? 'podman-chip-neutral' : 'podman-chip-warn');
    return '<span class="podman-chip ' + cls + '"><span class="d"></span>' + P.escapeHtml(status) + '</span>';
  }

  function renderSidebar() {
    P.el('compose-sidebar').innerHTML = projects.map(function (p) {
      return '<div class="podman-compose-proj' + (p.name === selected ? ' active' : '') + '" data-name="' + P.escapeHtml(p.name) + '">' +
        '<div class="name" style="display:flex; justify-content:space-between; gap:8px;">' + P.escapeHtml(p.name) + ' ' + statusChip(p.status) + '</div>' +
        '<div class="path">' + P.escapeHtml(p.path) + '</div>' +
        '</div>';
    }).join('') || '<div class="podman-empty-note">No compose projects yet — click "+ New Project".</div>';
  }

  // Up/Down/Pull/Save/Delete all need an actual selected project to act on
  // — disabled (rather than left clickable and erroring) whenever nothing
  // is selected, e.g. right after deleting the last project.
  function setToolbarEnabled(enabled) {
    ['compose-action-up', 'compose-action-down', 'compose-action-pull', 'compose-action-save', 'compose-action-delete'].forEach(function (id) {
      P.el(id).disabled = !enabled;
    });
    P.el('compose-yaml').disabled = !enabled;
  }

  function loadYaml(name) {
    P.el('compose-title').textContent = name + ' / compose.yaml';
    P.el('compose-yaml').value = 'Loading…';
    return P.get('compose', 'get', { project: name }).then(function (data) {
      P.el('compose-yaml').value = data.yaml;
    }).catch(function (err) {
      P.el('compose-yaml').value = 'Error: ' + err.message;
    });
  }

  function selectProject(name) {
    selected = name;
    setToolbarEnabled(true);
    renderSidebar();
    loadYaml(name);
  }

  function loadProjects() {
    return P.get('compose', 'list').then(function (data) {
      projects = data;
      if (selected && !projects.some(function (p) { return p.name === selected; })) {
        selected = null;
      }
      if (!selected && projects.length > 0) selected = projects[0].name;
      renderSidebar();
      if (selected) {
        setToolbarEnabled(true);
        loadYaml(selected);
      } else {
        setToolbarEnabled(false);
        P.el('compose-title').textContent = '—';
        P.el('compose-yaml').value = '';
      }
    }).catch(function (err) {
      P.el('compose-sidebar').innerHTML = '<div class="podman-error" style="padding:14px;">' + P.escapeHtml(err.message) + '</div>';
    });
  }

  function runAction(action) {
    if (!selected) return;
    const btn = P.el('compose-action-' + action);
    btn.disabled = true;
    // `podman compose` output can run to many lines — a log modal (same
    // pattern as Settings' service Start/Stop/Restart) fits that; a toast
    // has to stay short and auto-dismiss.
    const modal = P.openLogModal('podman compose ' + action + ' — ' + selected);
    P.post('compose', action, { project: selected }).then(function (data) {
      (data.output || 'Done.').split('\n').forEach(function (line) { modal.log(line); });
      modal.done();
      return loadProjects();
    }).catch(function (err) {
      modal.log('Failed: ' + err.message);
      modal.done('Close');
    }).finally(function () {
      btn.disabled = false;
    });
  }

  function saveYaml() {
    if (!selected) return;
    const btn = P.el('compose-action-save');
    btn.disabled = true;
    P.post('compose', 'save', { project: selected, yaml: P.el('compose-yaml').value }).then(function () {
      P.toast('Saved ' + selected + '.', 'success');
      return loadProjects();
    }).catch(function (err) {
      P.toast('Save failed: ' + err.message, 'error');
    }).finally(function () {
      btn.disabled = false;
    });
  }

  function deleteProject() {
    if (!selected) return;
    P.confirm('Delete project "' + selected + '"? This stops it (if running) and permanently removes its compose.yaml.', { danger: true, confirmLabel: 'Delete' }).then(function (ok) {
      if (!ok) return;
      const btn = P.el('compose-action-delete');
      btn.disabled = true;
      const name = selected;
      P.post('compose', 'remove', { project: selected }).then(function () {
        selected = null;
        P.toast('Deleted ' + name + '.', 'success');
        return loadProjects();
      }).catch(function (err) {
        P.toast('Delete failed: ' + err.message, 'error');
        btn.disabled = false;
      });
    });
  }

  function openNewProjectModal() {
    P.openFormModal({
      title: 'New Compose Project',
      submitLabel: 'Create',
      fields: [
        { name: 'name', label: 'Project name', required: true, placeholder: 'my-stack', hint: 'Letters, digits, "_", "-" only — no spaces.' },
      ],
      onSubmit: function (values) {
        if (!/^[a-zA-Z0-9_-]+$/.test(values.name)) {
          return Promise.reject(new Error('Project name can only contain letters, digits, "_", "-" — no spaces.'));
        }
        return P.post('compose', 'save', { project: values.name, yaml: STARTER_YAML }).then(function () {
          selected = values.name;
          return loadProjects();
        });
      },
    });
  }

  function init() {
    P.el('compose-sidebar').addEventListener('click', function (e) {
      const item = e.target.closest('.podman-compose-proj[data-name]');
      if (item) selectProject(item.dataset.name);
    });
    P.el('compose-new-btn').addEventListener('click', openNewProjectModal);
    P.el('compose-action-up').addEventListener('click', function () { runAction('up'); });
    P.el('compose-action-down').addEventListener('click', function () { runAction('down'); });
    P.el('compose-action-pull').addEventListener('click', function () { runAction('pull'); });
    P.el('compose-action-save').addEventListener('click', saveYaml);
    P.el('compose-action-delete').addEventListener('click', deleteProject);

    setToolbarEnabled(false);
    return loadProjects();
  }

  P.registerPanel('compose', { init: init, refresh: loadProjects });
})();