/** Pipeline graph: Cytoscape visualization + animation. */

let cy = null;
let _dragEnabled = true;
let _physicsRunning = false;
let _physicsLayout = null;
let _colaSpacing = 25;
let _colaStrengthMult = 1.0;
let _panEnabled = true;

const NODE_COLORS = {
  user: '#444', input: '#f59e0b', sensor: '#3b82f6',
  director: '#a855f7', pa: '#a855f7', thinker: '#f97316',
  interpreter: '#06b6d4', expert_eras: '#f97316', expert_plankiste: '#f97316',
  output: '#10b981', ui: '#10b981', memorizer: '#a855f7', s3_audit: '#ef4444',
};

const NODE_COLUMNS = {
  user: 0, input: 1, sensor: 1,
  director: 2, pa: 2, thinker: 2, interpreter: 2, s3_audit: 2,
  expert_eras: 2, expert_plankiste: 2,
  output: 3, ui: 3,
  memorizer: 4,
};

function buildGraphElements(graph, mx, cw, mid, row1, row2) {
  const elements = [];
  const roles = Object.keys(graph.nodes);
  elements.push({ data: { id: 'user', label: 'user' }, position: { x: mx, y: mid } });

  const columns = {};
  for (const role of roles) {
    const col = NODE_COLUMNS[role] !== undefined ? NODE_COLUMNS[role] : 2;
    if (!columns[col]) columns[col] = [];
    columns[col].push(role);
  }
  for (const [col, colRoles] of Object.entries(columns)) {
    const c = parseInt(col);
    const count = colRoles.length;
    for (let i = 0; i < count; i++) {
      const role = colRoles[i];
      const ySpread = (row2 - row1);
      const y = count === 1 ? mid : row1 + (ySpread * i / (count - 1));
      const label = role === 'memorizer' ? 'memo' : role.replace(/_v\d+$/, '').replace('expert_', '');
      elements.push({ data: { id: role, label }, position: { x: mx + cw * c, y } });
    }
  }

  const nodeIds = new Set(elements.map(e => e.data.id));
  const cytoEdges = graph.cytoscape ? graph.cytoscape.edges : [];
  if (cytoEdges.length) {
    for (const edge of cytoEdges) {
      const d = edge.data;
      if (!nodeIds.has(d.source) || !nodeIds.has(d.target)) continue;
      const edgeData = { id: d.id, source: d.source, target: d.target };
      if (d.condition === 'reflex') edgeData.reflex = true;
      if (d.edge_type === 'context') edgeData.ctx = true;
      elements.push({ data: edgeData });
    }
  } else {
    for (const edge of graph.edges) {
      const targets = Array.isArray(edge.to) ? edge.to : [edge.to];
      for (const tgt of targets) {
        if (!nodeIds.has(edge.from) || !nodeIds.has(tgt)) continue;
        const edgeData = { id: `e-${edge.from}-${tgt}`, source: edge.from, target: tgt };
        if (edge.condition === 'reflex') edgeData.reflex = true;
        if (edge.type === 'context') edgeData.ctx = true;
        elements.push({ data: edgeData });
      }
    }
  }
  elements.push({ data: { id: 'e-user-input', source: 'user', target: 'input' } });
  return elements;
}

export async function initGraph() {
  const container = document.getElementById('pipeline-graph');
  if (!container || typeof cytoscape === 'undefined') return;

  const rect = container.getBoundingClientRect();
  const W = rect.width || 900;
  const H = rect.height || 180;
  const mx = W * 0.07;
  const cw = (W - mx * 2) / 4;
  const row1 = H * 0.25, mid = H * 0.5, row2 = H * 0.75;

  let graphElements = null;
  try {
    const resp = await fetch('/api/graph/active');
    if (resp.ok) {
      const graph = await resp.json();
      graphElements = buildGraphElements(graph, mx, cw, mid, row1, row2);
    }
  } catch (e) {}

  if (!graphElements) {
    graphElements = [
      { data: { id: 'user', label: 'user' }, position: { x: mx, y: mid } },
      { data: { id: 'input', label: 'input' }, position: { x: mx + cw, y: row1 } },
      { data: { id: 'thinker', label: 'thinker' }, position: { x: mx + cw * 2, y: mid } },
      { data: { id: 'output', label: 'output' }, position: { x: mx + cw * 3, y: mid } },
    ];
  }

  cy = cytoscape({
    container,
    elements: graphElements,
    style: [
      { selector: 'node', style: {
        'label': 'data(label)', 'text-valign': 'center', 'text-halign': 'center',
        'font-size': '18px', 'min-zoomed-font-size': 10,
        'font-family': 'system-ui, sans-serif', 'font-weight': 700, 'color': '#aaa',
        'background-color': '#181818', 'border-width': 1, 'border-opacity': 0.3,
        'border-color': '#444', 'width': 48, 'height': 48,
        'transition-property': 'background-color, border-color, width, height',
        'transition-duration': '0.3s',
      }},
      ...Object.entries(NODE_COLORS).map(([id, color]) => ({
        selector: `#${id}`, style: { 'border-color': color, 'color': color }
      })),
      { selector: '#user', style: { 'color': '#888' } },
      { selector: '#sensor', style: { 'width': 40, 'height': 40, 'font-size': '15px' } },
      { selector: 'node.active', style: {
        'background-color': '#333', 'border-width': 3, 'width': 56, 'height': 56,
      }},
      { selector: 'edge', style: {
        'width': 1.5, 'line-color': '#333', 'target-arrow-color': '#333',
        'target-arrow-shape': 'triangle', 'arrow-scale': 0.7, 'curve-style': 'bezier',
        'transition-property': 'line-color, target-arrow-color, width',
        'transition-duration': '0.3s',
      }},
      { selector: 'edge[?reflex]', style: { 'line-style': 'dashed', 'line-dash-pattern': [4, 4], 'line-color': '#2a2a2a' } },
      { selector: 'edge[?ctx]', style: { 'line-style': 'dotted', 'line-color': '#1a1a2e', 'width': 1 } },
      { selector: 'edge.active', style: { 'line-color': '#888', 'target-arrow-color': '#888', 'width': 2.5 } },
    ],
    layout: { name: 'preset' },
    userZoomingEnabled: true, userPanningEnabled: true,
    wheelSensitivity: 0.3, boxSelectionEnabled: false,
    autoungrabify: false, selectionType: 'single',
  });

  container.addEventListener('contextmenu', e => e.stopPropagation(), true);
  if (typeof cytoscapeCola !== 'undefined') cytoscape.use(cytoscapeCola);
  startPhysics();

  cy.on('zoom', () => {
    const z = cy.zoom();
    cy.nodes().style('font-size', Math.round(12 / z) + 'px');
  });
}

function pulseNode(id) {
  if (!cy) return;
  const node = cy.getElementById(id);
  if (!node.length) return;
  node.addClass('active');
  setTimeout(() => node.removeClass('active'), 1500);
}

function flashEdge(sourceId, targetId) {
  if (!cy) return;
  const edge = cy.edges().filter(e => e.data('source') === sourceId && e.data('target') === targetId);
  if (!edge.length) return;
  edge.addClass('active');
  setTimeout(() => edge.removeClass('active'), 1000);
}

export function graphAnimate(event, node) {
  if (!cy) return;
  if (node && cy.getElementById(node).length) pulseNode(node);

  switch (event) {
    case 'perceived': pulseNode('input'); flashEdge('user', 'input'); break;
    case 'decided':
      if (node === 'director_v2' || node === 'director' || node === 'pa_v1') {
        pulseNode(node); flashEdge(node, 'thinker');
      } else {
        pulseNode(node || 'thinker'); flashEdge('thinker', 'output');
      }
      break;
    case 'routed': pulseNode('pa'); break;
    case 'reflex_path': pulseNode('input'); flashEdge('input', 'output'); break;
    case 'streaming': if (node === 'output') pulseNode('output'); break;
    case 'controls': case 'machine_created': case 'machine_transition':
      pulseNode('ui'); break;
    case 'updated': pulseNode('memorizer'); flashEdge('output', 'memorizer'); break;
    case 'tool_call': pulseNode(node || 'thinker'); break;
    case 'tool_result':
      if (cy.getElementById('interpreter').length) pulseNode('interpreter'); break;
    case 'thinking': if (node) pulseNode(node); break;
    case 'tick': pulseNode('sensor'); break;
  }
}

export function startPhysics() {
  if (!cy) return;
  stopPhysics();
  try {
    const rect = document.getElementById('pipeline-graph').getBoundingClientRect();
    _physicsLayout = cy.layout({
      name: 'cola', animate: true, infinite: true, fit: false,
      nodeSpacing: _colaSpacing,
      edgeElasticity: e => {
        const base = e.data('ctx') ? 0.1 : e.data('reflex') ? 0.2 : 0.6;
        return base * _colaStrengthMult;
      },
      boundingBox: { x1: 0, y1: 0, w: rect.width, h: rect.height },
    });
    _physicsLayout.run();
    _physicsRunning = true;
  } catch (e) {}
}

export function stopPhysics() {
  if (_physicsLayout) { try { _physicsLayout.stop(); } catch(e) {} _physicsLayout = null; }
  _physicsRunning = false;
}

// Expose control functions for HTML onclick
window.adjustCola = (param, delta) => {
  if (!cy) return;
  if (param === 'spacing') _colaSpacing = Math.max(5, Math.min(80, _colaSpacing + delta));
  else if (param === 'strength') _colaStrengthMult = Math.max(0.1, Math.min(3.0, _colaStrengthMult + delta * 0.2));
  startPhysics();
};
window.toggleDrag = () => {
  if (!cy) return;
  _dragEnabled = !_dragEnabled;
  cy.autoungrabify(!_dragEnabled);
  document.getElementById('btn-drag').textContent = 'drag: ' + (_dragEnabled ? 'on' : 'off');
};
window.togglePan = () => {
  if (!cy) return;
  _panEnabled = !_panEnabled;
  cy.userPanningEnabled(_panEnabled);
  cy.userZoomingEnabled(_panEnabled);
  document.getElementById('btn-pan').textContent = 'pan: ' + (_panEnabled ? 'on' : 'off');
};