/* =====================================================================
   PULSE — Workflows page (WP-D)
   ---------------------------------------------------------------------
   Owns: DOM id prefix `wf-`, action namespace `wf:*`.
   Consumes the frozen window.Pulse contract from /assets/app.js.
   ===================================================================== */
'use strict';

(function () {
  // Example workflow definition. The Create modal is pre-filled with this
  // every time it opens (fixes the old bug where the textarea was blanked).
  var EXAMPLE_DEFINITION = {
    steps: [
      {
        name: 'Example Step',
        type: 'execute',
        targets: ['all'],
        command: "echo 'Hello from PULSE'"
      }
    ]
  };

  // id -> parsed definition object, rebuilt on every list load.
  var _registry = {};
  // id -> raw row from the list response (name/description/etc.).
  var _rowsById = {};
  // workflow id currently targeted by the Run modal.
  var _pendingWorkflowId = null;

  function paramBadge(def) {
    var params = (def && def.params) || [];
    if (!params.length) return '';
    var n = params.length;
    return ' <span class="lt-badge lt-badge-sm">' + n + ' param' + (n > 1 ? 's' : '') + '</span>';
  }

  function parseDefinition(raw) {
    if (raw && typeof raw === 'object') return raw;
    if (typeof raw === 'string') {
      try { return JSON.parse(raw); } catch (e) { return {}; }
    }
    return {};
  }

  function renderEmptyState() {
    return (
      '<div class="lt-empty-state">' +
        '<div class="lt-empty-state-icon">&#x2699;</div>' +
        '<div class="lt-empty-state-title">No workflows yet</div>' +
        '<div class="lt-empty-state-body">Workflows let you run multi-step jobs across one or more workers.</div>' +
        '<button type="button" class="lt-btn lt-btn-primary" data-action="wf:create-open">Create your first workflow</button>' +
      '</div>'
    );
  }

  function renderRow(w) {
    var def = _registry[w.id] || {};
    var isAdmin = window.Pulse.isAdmin;
    var esc = window.Pulse.esc;
    var actions =
      '<button type="button" class="lt-btn lt-btn-sm lt-btn-primary" data-action="wf:execute" data-workflow-id="' +
        esc(w.id) + '">Execute</button>';
    if (isAdmin) {
      actions +=
        ' <button type="button" class="lt-btn lt-btn-sm lt-btn-secondary" data-action="wf:edit-open" data-workflow-id="' +
          esc(w.id) + '">Edit</button>' +
        ' <button type="button" class="lt-btn lt-btn-sm lt-btn-danger" data-action="wf:delete" data-workflow-id="' +
          esc(w.id) + '" data-workflow-name="' + esc(w.name) + '">Delete</button>';
    }
    var createdAt = window.Pulse.fmt.dateTime(w.created_at);
    return (
      '<tr>' +
        '<td data-label="Name">' + esc(w.name) + paramBadge(def) + '</td>' +
        '<td data-label="Description">' + esc(w.description || 'No description') + '</td>' +
        '<td data-label="Created">' + esc(w.created_by || 'Unknown') + ' &middot; ' + esc(createdAt) + '</td>' +
        '<td data-label="Actions"><div class="lt-btn-group">' + actions + '</div></td>' +
      '</tr>'
    );
  }

  function renderList(workflows) {
    var el = document.getElementById('wf-list');
    if (!el) return;
    if (!workflows.length) {
      el.innerHTML = renderEmptyState();
      return;
    }
    var rows = workflows.map(renderRow).join('');
    el.innerHTML =
      '<div class="lt-table-wrap">' +
        '<table class="lt-table lt-table-responsive">' +
          '<thead><tr><th>Name</th><th>Description</th><th>Created</th><th>Actions</th></tr></thead>' +
          '<tbody>' + rows + '</tbody>' +
        '</table>' +
      '</div>';
  }

  function renderLoadError(message) {
    var el = document.getElementById('wf-list');
    if (!el) return;
    el.innerHTML =
      '<div class="lt-alert lt-alert--error" role="alert">' +
        '<span class="lt-alert-icon">&#x26A0;</span>' +
        '<span class="lt-alert-msg">' + window.Pulse.esc(message || 'Failed to load workflows') + '</span>' +
      '</div>';
  }

  function loadWorkflows() {
    return window.Pulse.api.get('/api/workflows').then(function (workflows) {
      var list = workflows || [];
      _registry = {};
      _rowsById = {};
      list.forEach(function (w) {
        _rowsById[w.id] = w;
        _registry[w.id] = parseDefinition(w.definition);
      });
      renderList(list);
    }).catch(function (e) {
      renderLoadError(e && e.message);
    });
  }

  /* ---------------------------------------------------------------
     Create modal
     --------------------------------------------------------------- */
  function showFieldError(id, message) {
    var el = document.getElementById(id);
    if (!el) return;
    el.textContent = message || '';
    el.hidden = !message;
  }

  function openCreateModal() {
    document.getElementById('wf-create-form').reset();
    document.getElementById('wf-create-definition').value = JSON.stringify(EXAMPLE_DEFINITION, null, 2);
    showFieldError('wf-create-error', '');
    window.lt.modal.open('wf-create-modal');
  }

  function submitCreateForm(formEl) {
    var name = formEl.elements['name'].value.trim();
    var description = formEl.elements['description'].value.trim();
    var definitionText = formEl.elements['definition'].value;
    var webhookUrl = formEl.elements['webhook_url'].value.trim() || null;

    if (!name) {
      showFieldError('wf-create-error', 'Name is required.');
      return;
    }

    var definition;
    try {
      definition = JSON.parse(definitionText);
    } catch (e) {
      showFieldError('wf-create-error', 'Invalid JSON: ' + e.message);
      return;
    }
    showFieldError('wf-create-error', '');

    return window.Pulse.api.post('/api/workflows', {
      name: name,
      description: description,
      definition: definition,
      webhook_url: webhookUrl
    }).then(function () {
      window.lt.modal.close('wf-create-modal');
      window.Pulse.toast.success('Workflow created');
      return loadWorkflows();
    }).catch(function (e) {
      showFieldError('wf-create-error', (e && e.message) || 'Failed to create workflow');
    });
  }

  /* ---------------------------------------------------------------
     Edit modal (admin)
     --------------------------------------------------------------- */
  function openEditModal(workflowId) {
    showFieldError('wf-edit-error', '');
    return window.Pulse.api.get('/api/workflows/' + encodeURIComponent(workflowId)).then(function (wf) {
      document.getElementById('wf-edit-id').value = wf.id;
      document.getElementById('wf-edit-name').value = wf.name || '';
      document.getElementById('wf-edit-description').value = wf.description || '';
      document.getElementById('wf-edit-definition').value = JSON.stringify(parseDefinition(wf.definition), null, 2);
      document.getElementById('wf-edit-webhook').value = wf.webhook_url || '';
      window.lt.modal.open('wf-edit-modal');
    }).catch(function (e) {
      window.Pulse.toast.error((e && e.message) || 'Failed to load workflow');
    });
  }

  function submitEditForm(formEl) {
    var id = formEl.elements['id'].value;
    var name = formEl.elements['name'].value.trim();
    var description = formEl.elements['description'].value.trim();
    var definitionText = formEl.elements['definition'].value;
    var webhookUrl = formEl.elements['webhook_url'].value.trim() || null;

    if (!name) {
      showFieldError('wf-edit-error', 'Name is required.');
      return;
    }

    var definition;
    try {
      definition = JSON.parse(definitionText);
    } catch (e) {
      showFieldError('wf-edit-error', 'Invalid JSON: ' + e.message);
      return;
    }
    showFieldError('wf-edit-error', '');

    return window.Pulse.api.put('/api/workflows/' + encodeURIComponent(id), {
      name: name,
      description: description,
      definition: definition,
      webhook_url: webhookUrl
    }).then(function () {
      window.lt.modal.close('wf-edit-modal');
      window.Pulse.toast.success('Workflow saved');
      return loadWorkflows();
    }).catch(function (e) {
      showFieldError('wf-edit-error', (e && e.message) || 'Failed to save workflow');
    });
  }

  /* ---------------------------------------------------------------
     Delete (admin)
     --------------------------------------------------------------- */
  function deleteWorkflow(workflowId, workflowName) {
    return window.Pulse.confirm({
      title: 'Delete Workflow',
      message: 'Delete workflow "' + workflowName + '"? This cannot be undone.',
      type: 'error',
      confirmLabel: 'DELETE'
    }).then(function (ok) {
      if (!ok) return;
      return window.Pulse.api.delete('/api/workflows/' + encodeURIComponent(workflowId)).then(function () {
        window.Pulse.toast.success('Workflow deleted');
        return loadWorkflows();
      }).catch(function (e) {
        window.Pulse.toast.error((e && e.message) || 'Failed to delete workflow');
      });
    });
  }

  /* ---------------------------------------------------------------
     Run modal (execute): always shown, replaces the old confirm().
     --------------------------------------------------------------- */
  function paramFieldHtml(p) {
    var esc = window.Pulse.esc;
    var label = esc(p.label || p.name);
    var required = p.required ? ' <span class="wf-required">*</span>' : '';
    return (
      '<div class="lt-form-group">' +
        '<label class="lt-label" for="wf-run-param-' + esc(p.name) + '">' + label + required + '</label>' +
        '<input type="text" id="wf-run-param-' + esc(p.name) + '" class="lt-input" ' +
          'data-param-name="' + esc(p.name) + '" data-required="' + (p.required ? '1' : '0') + '" ' +
          'placeholder="' + esc(p.placeholder || '') + '">' +
      '</div>'
    );
  }

  function openRunModal(workflowId) {
    var row = _rowsById[workflowId];
    var def = _registry[workflowId] || {};
    var paramDefs = def.params || [];

    _pendingWorkflowId = workflowId;
    document.getElementById('wf-run-workflow-id').value = workflowId;
    document.getElementById('wf-run-name').textContent = row ? row.name : 'this workflow';
    document.getElementById('wf-run-dryrun').checked = false;

    var paramsEl = document.getElementById('wf-run-params');
    paramsEl.innerHTML = paramDefs.map(paramFieldHtml).join('');

    window.lt.modal.open('wf-run-modal');

    var first = paramsEl.querySelector('input');
    if (first) setTimeout(function () { first.focus(); }, 60);
  }

  function submitRunForm() {
    if (!_pendingWorkflowId) return;
    var def = _registry[_pendingWorkflowId] || {};
    var paramDefs = def.params || [];
    var params = {};

    for (var i = 0; i < paramDefs.length; i++) {
      var p = paramDefs[i];
      var el = document.getElementById('wf-run-param-' + p.name);
      var val = el ? el.value.trim() : '';
      if (p.required && !val) {
        el.classList.add('is-invalid');
        el.focus();
        return;
      }
      el && el.classList.remove('is-invalid');
      if (val) params[p.name] = val;
    }

    var dryRun = document.getElementById('wf-run-dryrun').checked;
    var workflowId = _pendingWorkflowId;

    return window.Pulse.api.post('/api/executions', {
      workflow_id: workflowId,
      params: params,
      dry_run: dryRun
    }).then(function (result) {
      window.lt.modal.close('wf-run-modal');
      _pendingWorkflowId = null;
      window.Pulse.toast.success(dryRun ? 'Dry run started' : 'Workflow started');
      window.location.href = '/executions?open=' + encodeURIComponent(result.id);
    }).catch(function (e) {
      window.Pulse.toast.error((e && e.message) || 'Failed to start execution');
    });
  }

  /* ---------------------------------------------------------------
     Actions + page registration
     --------------------------------------------------------------- */
  window.Pulse.actions.registerAll({
    'wf:create-open': function () { openCreateModal(); },
    'wf:create-submit': function (el) { return submitCreateForm(el); },
    'wf:execute': function (el) { openRunModal(el.getAttribute('data-workflow-id')); },
    'wf:edit-open': function (el) { return openEditModal(el.getAttribute('data-workflow-id')); },
    'wf:edit-submit': function (el) { return submitEditForm(el); },
    'wf:delete': function (el) {
      return deleteWorkflow(el.getAttribute('data-workflow-id'), el.getAttribute('data-workflow-name'));
    },
    'wf:param-submit': function () { return submitRunForm(); }
  });

  // Enter in a param input submits the Run form (matches old behaviour).
  document.addEventListener('keydown', function (ev) {
    if (ev.key !== 'Enter') return;
    var target = ev.target;
    if (!target || target.tagName !== 'INPUT') return;
    if (!target.closest || !target.closest('#wf-run-form')) return;
    ev.preventDefault();
    submitRunForm();
  });

  window.Pulse.registerPage({
    name: 'workflows',
    init: function () { return loadWorkflows(); },
    refresh: function () { return loadWorkflows(); },
    onEvent: function (type) {
      if (type === 'workflow_created' || type === 'workflow_updated' || type === 'workflow_deleted') {
        loadWorkflows();
        return true;
      }
      return false;
    }
  });
})();