import { app, navigate, isRouteCurrent } from '../router.js';
import { api } from '../api.js';
import {
  escapeHTML, formatDuration, formatTokenCount, formatCost, formatElapsed,
  getEnvelopeCorrelation, getEnvelopeType, getEnvelopeAttributes, getEnvelopePayload,
  isCurrentPath, renderCopyButton, statusIcon, skeletonRows, extractRunUsage,
} from '../utils.js';
import { subscribeWS } from '../ws.js';

let runDetailUnsubscribe = null;
let runLiveOps = {}; // spanID → { name, kind, startedAt, promptPreview, inputPreview }
let _runReloadTimer = null;
let runSpansViewMode = 'table';

export function cleanup() {
  if (runDetailUnsubscribe) { runDetailUnsubscribe(); runDetailUnsubscribe = null; }
  clearTimeout(_runReloadTimer);
  _runReloadTimer = null;
  runLiveOps = {};
}

function extractPromptPreview(spans) {
  for (const sp of spans) {
    const inner = (sp.payload || {}).payload || {};
    if (inner.prompt_preview) return inner.prompt_preview;
    if (inner.message_preview) return inner.message_preview;
  }
  return null;
}

function renderSpanPayload(sp) {
  const outer = sp.payload || {};
  const inner = outer.payload || {};
  const parts = [];

  if (sp.kind === 'tool') {
    if (inner.input !== undefined) {
      const inputStr = typeof inner.input === 'object'
        ? JSON.stringify(inner.input, null, 2)
        : String(inner.input);
      parts.push(`<div class="span-kv"><span class="span-kv-key">Input</span><pre class="span-kv-val span-kv-raw">${escapeHTML(inputStr)}</pre></div>`);
    }
    if (inner.result_preview !== undefined) {
      parts.push(`<div class="span-kv"><span class="span-kv-key">Result</span><pre class="span-kv-val span-kv-raw">${escapeHTML(String(inner.result_preview))}</pre></div>`);
    }
  } else if (sp.kind === 'agent') {
    if (inner.prompt_preview) {
      parts.push(`<div class="span-kv"><span class="span-kv-key">Prompt</span><pre class="span-kv-val span-kv-raw">${escapeHTML(String(inner.prompt_preview))}</pre></div>`);
    }
    if (inner.usage) {
      const u = inner.usage;
      const tokens = [
        u.total_tokens != null ? `${u.total_tokens} total` : null,
        u.input_tokens != null ? `${u.input_tokens} in` : null,
        u.output_tokens != null ? `${u.output_tokens} out` : null,
      ].filter(Boolean).join(' · ');
      if (tokens) parts.push(`<div class="span-kv"><span class="span-kv-key">Tokens</span><span class="span-kv-val">${escapeHTML(tokens)}</span></div>`);
      if (u.total_cost != null) {
        parts.push(`<div class="span-kv"><span class="span-kv-key">Cost</span><span class="span-kv-val">${escapeHTML(formatCost(u.total_cost))}</span></div>`);
      }
    }
    if (inner.model) {
      parts.push(`<div class="span-kv"><span class="span-kv-key">Model</span><span class="span-kv-val">${escapeHTML(String(inner.model))}</span></div>`);
    }
  } else {
    const raw = Object.keys(inner).length > 0 ? inner : (Object.keys(outer).length > 0 ? outer : null);
    if (raw) {
      parts.push(`<pre class="span-kv-raw">${escapeHTML(JSON.stringify(raw, null, 2))}</pre>`);
    }
  }

  if (sp.duration_ms != null) {
    parts.push(`<div class="span-kv"><span class="span-kv-key">Duration</span><span class="span-kv-val">${escapeHTML(formatDuration(sp.duration_ms))}</span></div>`);
  }

  return parts.length > 0
    ? parts.join('')
    : '<span style="font-size:0.75rem;color:var(--text-dim)">No payload data</span>';
}

function renderTimescale(totalMS) {
  const ticks = 5;
  return Array.from({ length: ticks + 1 }, (_, i) => {
    const pct = (i / ticks * 100).toFixed(0);
    return `<span style="left:${pct}%">${escapeHTML(formatDuration(totalMS * i / ticks))}</span>`;
  }).join('');
}

function renderSpanWaterfall(spans, runStartedAt, runDurationMS) {
  if (!spans || spans.length === 0) return '<p class="empty-state">No spans</p>';
  const runStart = new Date(runStartedAt).getTime();
  const totalMS = runDurationMS || Math.max(...spans.map(sp => {
    const s = new Date(sp.started_at || runStartedAt).getTime();
    return (s - runStart) + (sp.duration_ms || 0);
  }), 1);

  return `
    <div class="waterfall">
      <div class="waterfall-header">
        <div class="waterfall-name-col">Span</div>
        <div class="waterfall-bar-col">
          <div class="waterfall-timescale">${renderTimescale(totalMS)}</div>
        </div>
      </div>
      ${spans.map(sp => {
        const spStart = sp.started_at ? new Date(sp.started_at).getTime() - runStart : 0;
        const spDur = sp.duration_ms || 0;
        const leftPct = Math.max(0, (spStart / totalMS * 100)).toFixed(2);
        const widthPct = Math.max(0.5, (spDur / totalMS * 100)).toFixed(2);
        const kindClass = sp.kind || 'unknown';
        const statusClass = sp.status === 'error' ? ' wf-error' : sp.status === 'success' ? ' wf-success' : '';
        return `
          <div class="waterfall-row">
            <div class="waterfall-name-col">
              <span class="span-kind-badge ${escapeHTML(kindClass)}">${escapeHTML(sp.kind || '?')}</span>
              <span class="waterfall-name" title="${escapeHTML(sp.name || '')}">${escapeHTML((sp.name || '(unnamed)').slice(0, 40))}</span>
            </div>
            <div class="waterfall-bar-col">
              <div class="waterfall-bar-track">
                <div class="waterfall-bar${statusClass}" style="left:${leftPct}%;width:${widthPct}%" title="${escapeHTML(formatDuration(spDur))}">
                  <span class="waterfall-bar-label">${spDur > totalMS * 0.05 ? escapeHTML(formatDuration(spDur)) : ''}</span>
                </div>
              </div>
            </div>
          </div>`;
      }).join('')}
    </div>`;
}

function renderRunSpansRows(spans) {
  if (!spans || spans.length === 0) {
    return '<tr><td colspan="4" class="empty-state">No spans</td></tr>';
  }
  return spans.map((sp, i) => {
    const kindClass = sp.kind || 'unknown';
    return `
      <tr class="expandable run-span-row ${sp.status === 'error' ? 'tr-error' : ''}" data-index="${i}">
        <td>
          <span class="expand-icon"></span>
          <span class="span-kind-badge ${escapeHTML(kindClass)}">${escapeHTML(sp.kind || '?')}</span>
          ${escapeHTML(sp.name || '(unnamed)')}
        </td>
        <td>${escapeHTML(sp.kind || '-')}</td>
        <td>${statusIcon(sp.status)}</td>
        <td>${escapeHTML(formatDuration(sp.duration_ms))}</td>
      </tr>
      <tr class="span-detail-row" data-index="${i}" style="display:none">
        <td colspan="4">
          <div class="span-details-structured">${renderSpanPayload(sp)}</div>
        </td>
      </tr>`;
  }).join('');
}

function renderRunSpansTable(spans) {
  return `
    <div class="table-container">
      <table>
        <thead>
          <tr>
            <th>Name</th>
            <th>Kind</th>
            <th>Status</th>
            <th>Duration</th>
          </tr>
        </thead>
        <tbody id="spans-body">
          ${renderRunSpansRows(spans)}
        </tbody>
      </table>
    </div>`;
}

function captureOpenSpanIndices() {
  const openIndices = new Set();
  document.querySelectorAll('tr.span-detail-row').forEach(row => {
    if (row.style.display !== 'none') openIndices.add(row.dataset.index);
  });
  return openIndices;
}

function restoreOpenSpanIndices(openIndices) {
  if (!openIndices || openIndices.size === 0) return;
  document.querySelectorAll('tr.span-detail-row').forEach(row => {
    if (!openIndices.has(row.dataset.index)) return;
    row.style.display = 'table-row';
    const hdr = document.querySelector(`tr.run-span-row[data-index="${row.dataset.index}"]`);
    const icon = hdr?.querySelector('.expand-icon');
    if (icon) icon.style.transform = 'rotate(45deg)';
  });
}

function updateSpanViewButtons() {
  document.getElementById('spans-view-table')?.classList.toggle('active', runSpansViewMode === 'table');
  document.getElementById('spans-view-waterfall')?.classList.toggle('active', runSpansViewMode === 'waterfall');
}

function renderSpansView(spans, run, openIndices) {
  const container = document.getElementById('spans-container');
  if (!container) return;

  if (runSpansViewMode === 'waterfall') {
    container.innerHTML = renderSpanWaterfall(
      spans,
      run.started_at,
      run.ended_at ? new Date(run.ended_at) - new Date(run.started_at) : null,
    );
  } else {
    container.innerHTML = renderRunSpansTable(spans);
    bindRunSpanRows();
    restoreOpenSpanIndices(openIndices);
  }

  updateSpanViewButtons();
}

function bindSpanViewToggles(spans, run) {
  const tableBtn = document.getElementById('spans-view-table');
  const waterfallBtn = document.getElementById('spans-view-waterfall');

  if (tableBtn) {
    tableBtn.onclick = () => {
      runSpansViewMode = 'table';
      renderSpansView(spans, run, captureOpenSpanIndices());
    };
  }
  if (waterfallBtn) {
    waterfallBtn.onclick = () => {
      runSpansViewMode = 'waterfall';
      renderSpansView(spans, run, captureOpenSpanIndices());
    };
  }
}

function bindRunSpanRows() {
  document.querySelectorAll('tr.run-span-row').forEach(row => {
    row.addEventListener('click', () => {
      const idx = row.dataset.index;
      const detailRow = document.querySelector(`tr.span-detail-row[data-index="${idx}"]`);
      const icon = row.querySelector('.expand-icon');
      if (!detailRow) return;
      const isOpen = detailRow.style.display !== 'none';
      detailRow.style.display = isOpen ? 'none' : 'table-row';
      if (icon) icon.style.transform = isOpen ? '' : 'rotate(45deg)';
    });
    row.setAttribute('tabindex', '0');
    row.setAttribute('role', 'button');
    row.addEventListener('keydown', (e) => {
      if (e.key === 'Enter' || e.key === ' ') {
        e.preventDefault();
        row.click();
      }
    });
  });
}

function renderRunLiveOps() {
  const el = document.getElementById('run-live-ops');
  if (!el) return;
  const ops = Object.values(runLiveOps);
  if (ops.length === 0) {
    el.innerHTML = '';
    return;
  }
  el.innerHTML = `<div class="run-live-ops-inner">${ops.map(op => {
    const elapsed = Math.floor((Date.now() - op.startedAt) / 1000);
    const isSubagent = op.kind === 'agent' || op.subType === 'subagent';
    const icon = isSubagent ? '◎' : op.kind === 'run' ? '◌' : '▸';
    const label = isSubagent ? 'subagent' : op.kind === 'run' ? 'thinking' : 'tool';
    const preview = op.promptPreview || op.inputPreview || '';
    return `
      <div class="run-live-op-pill ${label}">
        <span class="run-live-op-spin">${icon}</span>
        <span class="run-live-op-name">${escapeHTML(op.name)}</span>
        ${preview ? `<span class="run-live-op-preview">${escapeHTML(preview.length > 60 ? preview.slice(0, 60) + '…' : preview)}</span>` : ''}
        <span class="run-live-op-time active-op-time" data-start="${op.startedAt}">${formatElapsed(elapsed)}</span>
      </div>`;
  }).join('')}</div>`;
}

function handleRunWS(runID, msg) {
  if (msg.type !== 'message') return;
  const correlation = getEnvelopeCorrelation(msg.data);
  if (correlation?.run_id !== runID) return;

  // Track live ops from WS without full reload
  const eventType = getEnvelopeType(msg.data);
  const attrs = getEnvelopeAttributes(msg.data);
  const payload = getEnvelopePayload(msg.data);
  const spanID = correlation.span_id;

  if (eventType === 'span.start' && spanID) {
    runLiveOps[spanID] = {
      name: attrs.name || attrs.span_kind || 'span',
      kind: attrs.span_kind || '',
      subType: attrs.type || '',
      startedAt: Date.now(),
      promptPreview: payload.prompt_preview || '',
      inputPreview: payload.input ? (typeof payload.input === 'string' ? payload.input.slice(0, 100) : '') : '',
    };
    renderRunLiveOps();
  }
  if (eventType === 'span.end' && spanID) {
    delete runLiveOps[spanID];
    renderRunLiveOps();
  }
  if (eventType === 'run.start') {
    runLiveOps['__run__'] = {
      name: 'Thinking…',
      kind: 'run',
      startedAt: Date.now(),
      promptPreview: payload.prompt_preview || payload.message_preview || payload.message || '',
      inputPreview: '',
    };
    renderRunLiveOps();
  }
  if (eventType === 'run.end') {
    delete runLiveOps['__run__'];
    runLiveOps = {};
    renderRunLiveOps();
  }

  clearTimeout(_runReloadTimer);
  _runReloadTimer = setTimeout(() => loadRunDetailData(runID), 500);
}

async function loadRunDetailData(runID) {
  if (!isCurrentPath('/runs/' + runID)) return;
  try {
    const data = await api('/v1/runs/' + runID);
    const spans = data.spans || [];
    const r = data.run;
    const openIndices = captureOpenSpanIndices();

    renderSpansView(spans, r, openIndices);
    bindSpanViewToggles(spans, r);

    const countEl = document.getElementById('run-detail-span-count');
    if (countEl) countEl.textContent = spans.length;

    if (r.ended_at) {
      const durEl = document.getElementById('run-detail-duration');
      if (durEl) durEl.textContent = formatDuration(new Date(r.ended_at) - new Date(r.started_at));
      if (runDetailUnsubscribe) { runDetailUnsubscribe(); runDetailUnsubscribe = null; }
      const liveSpan = document.querySelector('.section-title .live-indicator');
      if (liveSpan) liveSpan.remove();
    }
  } catch (e) {
    console.error('Failed to reload run detail:', e);
  }
}

export async function renderRun(runID, routeToken) {
  app.innerHTML = '<div style="padding:2rem"><div class="skeleton-line" style="width:40%;height:1.5rem;margin-bottom:1rem"></div><div class="skeleton-line" style="width:60%;margin-bottom:2rem"></div>' + '<div class="table-container"><table><thead><tr><th>Name</th><th>Kind</th><th>Status</th><th>Duration</th></tr></thead><tbody>' + skeletonRows(5, 4) + '</tbody></table></div></div>';
  runLiveOps = {};
  runSpansViewMode = 'table';
  let data;
  try {
    data = await api('/v1/runs/' + runID);
  } catch (e) {
    if (routeToken && !isRouteCurrent(routeToken)) return;
    app.innerHTML = `<p class="empty-state">Error loading run: ${escapeHTML(e.message)}</p>`;
    return;
  }
  if (routeToken && !isRouteCurrent(routeToken)) return;

  const r = data.run;
  const spans = data.spans || [];
  const duration = r.ended_at
    ? formatDuration(new Date(r.ended_at) - new Date(r.started_at))
    : 'ongoing';
  const runUsage = extractRunUsage(spans);
  const promptPreview = extractPromptPreview(spans);

  app.innerHTML = `
    <a href="/sessions/${escapeHTML(r.session_id)}" class="back-link">&larr; Back to Session</a>
    <div class="page-header">
      <h2>Run <span style="font-family:var(--font-mono);font-size:1.1rem;color:var(--accent)" title="${escapeHTML(runID)}">${escapeHTML(runID.substring(0, 16))}…</span>${renderCopyButton(runID)} ${statusIcon(r.status)}</h2>
      <div class="meta-tiles">
        <div class="meta-tile">
          <div class="meta-tile-label">Started</div>
          <div class="meta-tile-value">${escapeHTML(new Date(r.started_at).toLocaleString())}</div>
        </div>
        <div class="meta-tile">
          <div class="meta-tile-label">Duration</div>
          <div class="meta-tile-value" id="run-detail-duration">${escapeHTML(duration)}</div>
        </div>
        ${r.model ? `<div class="meta-tile"><div class="meta-tile-label">Model</div><div class="meta-tile-value" style="font-size:0.78rem">${escapeHTML(r.model.replace(/^claude-/, ''))}</div></div>` : ''}
        ${r.tool_count ? `<div class="meta-tile"><div class="meta-tile-label">Tool Calls</div><div class="meta-tile-value">${r.tool_count}</div></div>` : ''}
        ${runUsage ? `<div class="meta-tile"><div class="meta-tile-label">Tokens</div><div class="meta-tile-value">${escapeHTML(formatTokenCount(runUsage.totalTokens))}</div>${(runUsage.inputTokens || runUsage.outputTokens) ? `<div class="meta-tile-sub">${escapeHTML(formatTokenCount(runUsage.inputTokens))} in · ${escapeHTML(formatTokenCount(runUsage.outputTokens))} out</div>` : ''}</div>` : ''}
        ${runUsage ? `<div class="meta-tile"><div class="meta-tile-label">Cost</div><div class="meta-tile-value">${escapeHTML(formatCost(runUsage.totalCost))}</div></div>` : ''}
      </div>
    </div>
    ${!r.ended_at ? '<div class="run-live-ops" id="run-live-ops"></div>' : ''}
    ${promptPreview ? `
    <div class="prompt-preview-section">
      <div class="prompt-preview-label">Prompt</div>
      <pre class="prompt-preview-text">${escapeHTML(promptPreview)}</pre>
    </div>` : ''}
    <div class="section-title">
      Spans <span class="count" id="run-detail-span-count">${spans.length}</span>
      ${!r.ended_at ? '<span class="live-indicator" style="margin-left:0.5rem"><span class="live-dot"></span>Live</span>' : ''}
      <div class="view-toggle" style="margin-left:auto">
        <button class="view-toggle-btn active" id="spans-view-table" type="button">Table</button>
        <button class="view-toggle-btn" id="spans-view-waterfall" type="button">Waterfall</button>
      </div>
    </div>
    <div id="spans-container">
      ${renderRunSpansTable(spans)}
    </div>
  `;

  bindRunSpanRows();
  bindSpanViewToggles(spans, r);

  document.querySelector('.back-link').addEventListener('click', e => {
    e.preventDefault();
    navigate('/sessions/' + r.session_id);
  });

  if (!r.ended_at) {
    runDetailUnsubscribe = subscribeWS((msg) => handleRunWS(runID, msg));
  }
}