/**
 * javascript/containers.js
 *
 * Containers panel: table of all containers with lifecycle actions
 * (start/stop/restart/remove), backed entirely by ajax/containers.php.
 */
(function () {
  'use strict';
  const P = window.Podman;
  let allContainers = [];
  let filter = 'all';
  let searchTerm = '';

  function iconLabel(name) {
    return P.escapeHtml(name.slice(0, 2).toUpperCase());
  }

  function rowHtml(c) {
    const cpuMem = c.state === 'running'
      ? '<span class="podman-row-sub">running</span>'
      : '<span class="podman-row-sub">&mdash;</span>';

    return '' +
      '<tr data-id="' + P.escapeHtml(c.id) + '">' +
      '<td><span class="podman-chip ' + P.stateChipClass(c.state) + '"><span class="d"></span>' + P.escapeHtml(c.health || c.state) + '</span></td>' +
      '<td><button type="button" class="podman-row-name podman-row-name-btn" data-action="details">' +
      '<span class="ico">' + iconLabel(c.name) + '</span>' + P.escapeHtml(c.name) + '</button></td>' +
      '<td class="mono podman-row-sub">' + P.escapeHtml(c.image) + '</td>' +
      '<td>' + cpuMem + '</td>' +
      '<td class="mono podman-row-sub">' + P.escapeHtml(c.ports.join(', ') || '&mdash;') + '</td>' +
      '<td class="tnum">' + P.formatDuration(c.uptimeSeconds) + '</td>' +
      '<td class="podman-actions">' + actionButtons(c) + '</td>' +
      '</tr>';
  }

  function actionButtons(c) {
    if (c.state === 'running') {
      return '' +
        '<button class="podman-btn podman-btn-icon" data-action="restart" title="Restart">&#8635;</button>' +
        '<button class="podman-btn podman-btn-icon" data-action="stop" title="Stop">&#9632;</button>' +
        '<button class="podman-btn podman-btn-icon" data-action="menu" title="More">&#8942;</button>';
    }
    if (c.state === 'paused') {
      return '' +
        '<button class="podman-btn podman-btn-icon" data-action="unpause" title="Resume">&#9654;</button>' +
        '<button class="podman-btn podman-btn-icon" data-action="menu" title="More">&#8942;</button>';
    }
    return '' +
      '<button class="podman-btn podman-btn-icon" data-action="start" title="Start">&#9654;</button>' +
      '<button class="podman-btn podman-btn-icon" data-action="menu" title="More">&#8942;</button>';
  }

  function openRowMenu(c, anchorBtn) {
    const items = [];
    if (c.state === 'running') {
      items.push({ label: 'Pause', onClick: function () { handleAction(c.id, 'pause'); } });
      items.push({ label: 'Kill', danger: true, onClick: function () { handleAction(c.id, 'kill'); } });
    }
    items.push({ label: 'Rename', onClick: function () { openRenameModal(c); } });
    items.push('separator');
    items.push({
      label: 'Remove',
      danger: true,
      disabled: c.state === 'running',
      onClick: function () { handleAction(c.id, 'remove'); },
    });
    P.openContextMenu(anchorBtn, items);
  }

  function openRenameModal(c) {
    P.openFormModal({
      title: 'Rename Container',
      submitLabel: 'Rename',
      fields: [{ name: 'name', label: 'New name', required: true, placeholder: c.name }],
      onSubmit: function (values) {
        return P.post('containers', 'rename', { id: c.id, name: values.name }).then(load);
      },
    });
  }

  // --- Detail view -----------------------------------------------------------
  //
  // Fed entirely by the existing inspect action (raw libpod inspect JSON) —
  // no new backend endpoint needed, just slicing that one payload into
  // tabs. Field names below (Config.Env, Config.Labels, Mounts,
  // NetworkSettings.Networks, HostConfig.RestartPolicy, ...) were checked
  // live against a real inspect response, not assumed from docs.

  function kvTable(rows) {
    if (rows.length === 0) return '<div class="podman-detail-empty">None.</div>';
    return '<table class="podman-detail-table">' + rows.map(function (r) {
      return '<tr><td>' + P.escapeHtml(r[0]) + '</td><td class="mono">' + P.escapeHtml(r[1]) + '</td></tr>';
    }).join('') + '</table>';
  }

  function renderOverviewTab(d) {
    const cfg = d.Config || {};
    const hostCfg = d.HostConfig || {};
    return kvTable([
      ['Name', (d.Name || '').replace(/^\//, '')],
      ['ID', d.Id || ''],
      ['Image', cfg.Image || d.Image || ''],
      ['Created', d.Created || ''],
      ['Command', (cfg.Cmd || []).join(' ') || (cfg.Entrypoint || []).join(' ') || '—'],
      ['State', (d.State && d.State.Status) || '—'],
      ['Restart policy', (hostCfg.RestartPolicy && hostCfg.RestartPolicy.Name) || '—'],
      ['Restart count', String(d.RestartCount || 0)],
      ['Privileged', hostCfg.Privileged ? 'yes' : 'no'],
      ['Working dir', cfg.WorkingDir || '—'],
    ]);
  }

  function renderEnvTab(d) {
    const env = (d.Config && d.Config.Env) || [];
    return kvTable(env.map(function (line) {
      const idx = line.indexOf('=');
      return idx === -1 ? [line, ''] : [line.slice(0, idx), line.slice(idx + 1)];
    }));
  }

  function renderLabelsTab(d) {
    const labels = (d.Config && d.Config.Labels) || {};
    return kvTable(Object.keys(labels).map(function (k) { return [k, labels[k]]; }));
  }

  function renderMountsTab(d) {
    const mounts = d.Mounts || [];
    if (mounts.length === 0) return '<div class="podman-detail-empty">No mounts.</div>';
    return '<table class="podman-detail-table">' +
      '<tr><td>Type</td><td>Source &rarr; Destination</td></tr>' +
      mounts.map(function (m) {
        const mode = m.RW ? 'rw' : 'ro';
        return '<tr><td>' + P.escapeHtml(m.Type || '') + '</td><td class="mono">' +
          P.escapeHtml(m.Source || '') + ' &rarr; ' + P.escapeHtml(m.Destination || '') +
          ' <span class="podman-row-sub">(' + mode + ')</span></td></tr>';
      }).join('') + '</table>';
  }

  function renderNetworksTab(d) {
    const networks = (d.NetworkSettings && d.NetworkSettings.Networks) || {};
    const names = Object.keys(networks);
    if (names.length === 0) return '<div class="podman-detail-empty">No networks (host or none mode).</div>';
    return names.map(function (name) {
      const n = networks[name];
      return '<div style="margin-bottom:14px;"><div style="font-weight:700; font-size:12.5px; margin-bottom:6px;">' +
        P.escapeHtml(name) + '</div>' + kvTable([
          ['IP address', n.IPAddress || '—'],
          ['Gateway', n.Gateway || '—'],
          ['MAC address', n.MacAddress || '—'],
          ['Aliases', (n.Aliases || []).join(', ') || '—'],
        ]) + '</div>';
    }).join('');
  }

  function renderInspectTab(d) {
    return '<div class="podman-detail-json">' + P.escapeHtml(JSON.stringify(d, null, 2)) + '</div>';
  }

  const DETAIL_TABS = [
    { id: 'overview', label: 'Overview', render: renderOverviewTab },
    { id: 'env', label: 'Environment', render: renderEnvTab },
    { id: 'labels', label: 'Labels', render: renderLabelsTab },
    { id: 'mounts', label: 'Mounts', render: renderMountsTab },
    { id: 'networks', label: 'Networks', render: renderNetworksTab },
    { id: 'inspect', label: 'Inspect (JSON)', render: renderInspectTab },
  ];

  function openDetailModal(c) {
    const backdrop = document.createElement('div');
    backdrop.className = 'podman-modal-backdrop';
    backdrop.innerHTML = '' +
      '<div class="podman-modal podman-modal-xwide" role="dialog" aria-modal="true">' +
      '<div class="podman-modal-head"><h3>' + P.escapeHtml(c.name) + '</h3></div>' +
      '<div class="podman-detail-tabs">' + DETAIL_TABS.map(function (t, i) {
        return '<button type="button" data-tab="' + t.id + '"' + (i === 0 ? ' class="active"' : '') + '>' + t.label + '</button>';
      }).join('') + '</div>' +
      '<div class="podman-detail-body"><div class="podman-loading">Loading…</div></div>' +
      '<div class="podman-modal-actions"><button type="button" class="podman-btn" data-role="cancel">Close</button></div>' +
      '</div>';

    (document.querySelector('.podman-plugin') || document.body).appendChild(backdrop);
    backdrop.querySelector('[data-role="cancel"]').addEventListener('click', function () { backdrop.remove(); });
    backdrop.addEventListener('click', function (e) { if (e.target === backdrop) backdrop.remove(); });
    document.addEventListener('keydown', function onKey(e) {
      if (e.key === 'Escape') { backdrop.remove(); document.removeEventListener('keydown', onKey); }
    });

    const body = backdrop.querySelector('.podman-detail-body');
    P.get('containers', 'inspect', { id: c.id }).then(function (data) {
      function showTab(tabId) {
        const tab = DETAIL_TABS.find(function (t) { return t.id === tabId; });
        body.innerHTML = tab.render(data);
      }
      backdrop.querySelectorAll('[data-tab]').forEach(function (btn) {
        btn.addEventListener('click', function () {
          backdrop.querySelectorAll('[data-tab]').forEach(function (b) { b.classList.remove('active'); });
          btn.classList.add('active');
          showTab(btn.dataset.tab);
        });
      });
      showTab('overview');
    }).catch(function (err) {
      body.innerHTML = '<div class="podman-error">' + P.escapeHtml(err.message) + '</div>';
    });
  }

  function applyFilters() {
    return allContainers.filter(function (c) {
      if (filter === 'running' && c.state !== 'running') return false;
      if (filter === 'stopped' && c.state === 'running') return false;
      if (searchTerm && c.name.toLowerCase().indexOf(searchTerm) === -1 && c.image.toLowerCase().indexOf(searchTerm) === -1) return false;
      return true;
    });
  }

  function renderTable() {
    const tbody = P.el('containers-tbody');
    const visible = applyFilters();
    tbody.innerHTML = visible.length
      ? visible.map(rowHtml).join('')
      : '<tr><td colspan="7" class="podman-empty-note">No containers match.</td></tr>';
  }

  function renderCounts() {
    const running = allContainers.filter(function (c) { return c.state === 'running'; }).length;
    P.el('containers-count-all').textContent = 'All ' + allContainers.length;
    P.el('containers-count-running').textContent = 'Running ' + running;
    P.el('containers-count-stopped').textContent = 'Stopped ' + (allContainers.length - running);
  }

  function load() {
    const tbody = P.el('containers-tbody');
    tbody.innerHTML = P.loadingRow(7);
    return P.get('containers', 'list').then(function (data) {
      allContainers = data;
      renderCounts();
      renderTable();
    }).catch(function (err) {
      tbody.innerHTML = P.errorRow(7, err.message);
    });
  }

  // --- Create Container -----------------------------------------------------
  //
  // Purpose-built modal (not app.js's generic openFormModal, which only
  // supports flat text fields) — port/volume/env rows are dynamic
  // add/remove groups, and network needs a <select> populated from the
  // real network list, none of which fits the generic helper. Reuses its
  // .podman-modal-* CSS classes for visual consistency.

  function portRowHtml() {
    return '' +
      '<div class="podman-row-group-item">' +
      '<input type="text" class="mono" data-field="hostPort" placeholder="Host port">' +
      '<span>&rarr;</span>' +
      '<input type="text" class="mono" data-field="containerPort" placeholder="Container port">' +
      '<select data-field="protocol"><option value="tcp">TCP</option><option value="udp">UDP</option></select>' +
      '<button type="button" class="podman-btn podman-btn-icon" data-remove-row title="Remove">&times;</button>' +
      '</div>';
  }

  function volumeRowHtml() {
    return '' +
      '<div class="podman-row-group-item">' +
      '<select data-field="kind"><option value="named">Volume</option><option value="path">Host path</option></select>' +
      '<input type="text" class="mono" data-field="source" placeholder="my-volume or /mnt/cache/...">' +
      '<span>&rarr;</span>' +
      '<input type="text" class="mono" data-field="containerPath" placeholder="/data">' +
      '<button type="button" class="podman-btn podman-btn-icon" data-remove-row title="Remove">&times;</button>' +
      '</div>';
  }

  function envRowHtml() {
    return '' +
      '<div class="podman-row-group-item">' +
      '<input type="text" class="mono" data-field="key" placeholder="KEY">' +
      '<span>=</span>' +
      '<input type="text" class="mono" data-field="value" placeholder="value">' +
      '<button type="button" class="podman-btn podman-btn-icon" data-remove-row title="Remove">&times;</button>' +
      '</div>';
  }

  function addRow(groupEl, rowHtmlFn) {
    const div = document.createElement('div');
    div.innerHTML = rowHtmlFn();
    const row = div.firstElementChild;
    row.querySelector('[data-remove-row]').addEventListener('click', function () { row.remove(); });
    groupEl.appendChild(row);
  }

  function readRows(groupEl) {
    return Array.from(groupEl.children).map(function (row) {
      const values = {};
      row.querySelectorAll('[data-field]').forEach(function (input) {
        values[input.dataset.field] = input.value.trim();
      });
      return values;
    });
  }

  function openCreateContainerModal() {
    const backdrop = document.createElement('div');
    backdrop.className = 'podman-modal-backdrop';
    backdrop.innerHTML = '' +
      '<div class="podman-modal podman-modal-wide" role="dialog" aria-modal="true">' +
      '<div class="podman-modal-head"><h3>New Container</h3></div>' +
      '<form class="podman-modal-body">' +
      '<div class="podman-modal-field"><label>Image</label>' +
      '<input type="text" id="cc-image" placeholder="docker.io/library/postgres:16"></div>' +
      '<div class="podman-modal-field"><label>Name (optional)</label>' +
      '<input type="text" id="cc-name" placeholder="my-container"></div>' +
      '<div class="podman-modal-field"><label>Network</label>' +
      '<select id="cc-network"><option value="bridge">Bridge (default)</option>' +
      '<option value="host">Host</option><option value="none">None</option></select></div>' +
      '<div class="podman-modal-field"><label>Port mappings</label>' +
      '<div class="podman-row-group" id="cc-ports"></div>' +
      '<button type="button" class="podman-btn" data-add="port">+ Add port</button></div>' +
      '<div class="podman-modal-field"><label>Volumes</label>' +
      '<div class="podman-row-group" id="cc-volumes"></div>' +
      '<button type="button" class="podman-btn" data-add="volume">+ Add volume</button></div>' +
      '<div class="podman-modal-field"><label>Environment variables</label>' +
      '<div class="podman-row-group" id="cc-env"></div>' +
      '<button type="button" class="podman-btn" data-add="env">+ Add variable</button></div>' +
      '<div class="podman-modal-field"><label>Restart policy</label>' +
      '<select id="cc-restart"><option value="no">No</option><option value="on-failure">On failure</option>' +
      '<option value="always">Always</option><option value="unless-stopped">Unless stopped</option></select></div>' +
      '<div class="podman-modal-field podman-modal-checkbox"><label>' +
      '<input type="checkbox" id="cc-privileged"> Privileged</label></div>' +
      '<div class="podman-modal-field podman-modal-checkbox"><label>' +
      '<input type="checkbox" id="cc-start" checked> Start after create</label></div>' +
      '</form>' +
      '<div class="podman-modal-actions">' +
      '<button type="button" class="podman-btn" data-role="cancel">Cancel</button>' +
      '<button type="button" class="podman-btn podman-btn-primary" data-role="submit">Create</button>' +
      '</div></div>';

    (document.querySelector('.podman-plugin') || document.body).appendChild(backdrop);

    const portsGroup = backdrop.querySelector('#cc-ports');
    const volumesGroup = backdrop.querySelector('#cc-volumes');
    const envGroup = backdrop.querySelector('#cc-env');
    addRow(portsGroup, portRowHtml);
    addRow(volumesGroup, volumeRowHtml);
    addRow(envGroup, envRowHtml);

    backdrop.querySelector('[data-add="port"]').addEventListener('click', function () { addRow(portsGroup, portRowHtml); });
    backdrop.querySelector('[data-add="volume"]').addEventListener('click', function () { addRow(volumesGroup, volumeRowHtml); });
    backdrop.querySelector('[data-add="env"]').addEventListener('click', function () { addRow(envGroup, envRowHtml); });

    // Populate the network dropdown with any existing custom (non-default)
    // podman networks, in addition to the built-in bridge/host/none modes
    // — best-effort: if the list call fails, the three built-ins still work.
    P.get('networks', 'list').then(function (networks) {
      const select = backdrop.querySelector('#cc-network');
      networks.filter(function (n) { return !n.isDefault; }).forEach(function (n) {
        const opt = document.createElement('option');
        opt.value = n.name;
        opt.textContent = n.name;
        select.appendChild(opt);
      });
    }).catch(function () { /* built-in modes still usable */ });

    backdrop.querySelector('#cc-image').focus();

    function close() { backdrop.remove(); }

    function showError(message) {
      let box = backdrop.querySelector('.podman-modal-error');
      if (!box) {
        box = document.createElement('div');
        box.className = 'podman-modal-error';
        backdrop.querySelector('.podman-modal-body').appendChild(box);
      }
      box.textContent = message;
    }

    function submit() {
      const image = backdrop.querySelector('#cc-image').value.trim();
      if (!image) {
        showError('"Image" is required.');
        return;
      }
      const ports = readRows(portsGroup).filter(function (r) { return r.hostPort && r.containerPort; });
      const volumes = readRows(volumesGroup).filter(function (r) { return r.source && r.containerPath; });
      const env = readRows(envGroup).filter(function (r) { return r.key; });

      const submitBtn = backdrop.querySelector('[data-role="submit"]');
      submitBtn.disabled = true;
      P.post('containers', 'create', {
        image: image,
        name: backdrop.querySelector('#cc-name').value.trim(),
        networkMode: backdrop.querySelector('#cc-network').value,
        ports: ports,
        volumes: volumes,
        env: env,
        restartPolicy: backdrop.querySelector('#cc-restart').value,
        privileged: backdrop.querySelector('#cc-privileged').checked,
        startAfterCreate: backdrop.querySelector('#cc-start').checked,
      }).then(function () {
        close();
        return load();
      }).catch(function (err) {
        submitBtn.disabled = false;
        showError(err.message);
      });
    }

    backdrop.querySelector('[data-role="cancel"]').addEventListener('click', close);
    backdrop.querySelector('[data-role="submit"]').addEventListener('click', submit);
    backdrop.querySelector('form').addEventListener('submit', function (e) { e.preventDefault(); submit(); });
    backdrop.addEventListener('click', function (e) { if (e.target === backdrop) close(); });
    document.addEventListener('keydown', function onKey(e) {
      if (e.key === 'Escape') { close(); document.removeEventListener('keydown', onKey); }
    });
  }

  function handleAction(id, action, btn) {
    const doIt = function (extra) {
      if (btn) btn.disabled = true;
      return P.post('containers', action, Object.assign({ id: id }, extra)).then(load).catch(function (err) {
        alert('Action failed: ' + err.message);
        if (btn) btn.disabled = false;
      });
    };
    if (action === 'remove') {
      if (!confirm('Remove this container? This does not remove its volumes.')) return;
      doIt({ force: true });
    } else if (action === 'kill') {
      if (!confirm('Send SIGKILL to this container? Unlike Stop, this does not let it shut down gracefully.')) return;
      doIt({});
    } else {
      doIt({});
    }
  }

  function init() {
    P.el('containers-create-btn').addEventListener('click', openCreateContainerModal);

    P.el('containers-search').addEventListener('input', function (e) {
      searchTerm = e.target.value.trim().toLowerCase();
      renderTable();
    });

    document.querySelectorAll('#containers-filterset button').forEach(function (btn) {
      btn.addEventListener('click', function () {
        document.querySelectorAll('#containers-filterset button').forEach(function (b) { b.classList.remove('active'); });
        btn.classList.add('active');
        filter = btn.dataset.filter;
        renderTable();
      });
    });

    P.el('containers-tbody').addEventListener('click', function (e) {
      const btn = e.target.closest('button[data-action]');
      if (!btn || btn.disabled) return;
      const row = btn.closest('tr');
      const id = row.dataset.id;
      if (btn.dataset.action === 'menu' || btn.dataset.action === 'details') {
        const c = allContainers.find(function (x) { return x.id === id; });
        if (!c) return;
        if (btn.dataset.action === 'menu') {
          openRowMenu(c, btn);
        } else {
          openDetailModal(c);
        }
        return;
      }
      handleAction(id, btn.dataset.action, btn);
    });

    return load();
  }

  P.registerPanel('containers', { init: init, refresh: load });
})();