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<!DOCTYPE html>
<html>
<head>
  <!--
    If you are serving your web app in a path other than the root, change the
    href value below to reflect the base path you are serving from.

    The path provided below has to start and end with a slash "/" in order for
    it to work correctly.

    For more details:
    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base

    This is a placeholder for base href that will be replaced by the value of
    the `--base-href` argument provided to `flutter build`.
  -->
  <base href="/">

  <meta charset="UTF-8">
  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, viewport-fit=cover">
  <meta name="description" content="llamadart chat: CDN-first web bridge loading for on-device LLM chat with model management and tool calling.">
  <meta name="theme-color" content="#0b1220">
  <meta name="application-name" content="llamadart chat">

  <meta property="og:type" content="website">
  <meta property="og:title" content="llamadart chat">
  <meta property="og:description" content="CDN-first WebGPU bridge loading for on-device LLM chat powered by llamadart.">
  <meta property="og:image" content="icons/logo.svg">
  <meta property="og:site_name" content="llamadart chat">

  <meta name="twitter:card" content="summary_large_image">
  <meta name="twitter:title" content="llamadart chat">
  <meta name="twitter:description" content="CDN-first WebGPU bridge loading for on-device LLM chat powered by llamadart.">
  <meta name="twitter:image" content="icons/logo.svg">

  <!-- iOS meta tags & icons -->
  <meta name="mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <meta name="apple-mobile-web-app-title" content="llamadart chat">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">

  <!-- Favicon -->
  <link rel="icon" type="image/svg+xml" href="icons/logo.svg"/>
  <link rel="alternate icon" type="image/png" href="favicon.png"/>

  <title>llamadart chat</title>
  <link rel="manifest" href="manifest.json">
</head>
<body>
  <script type="module">
    async function clearFlutterServiceWorkerCaches() {
      if (typeof window === 'undefined') {
        return;
      }

      if ('serviceWorker' in navigator) {
        try {
          const registrations = await navigator.serviceWorker.getRegistrations();
          await Promise.allSettled(
            registrations.map((registration) => registration.unregister()),
          );
        } catch (_) {
          // best-effort cleanup only
        }
      }

      if ('caches' in window) {
        try {
          const keys = await caches.keys();
          const flutterLikeKeys = keys.filter((key) =>
            key.startsWith('flutter-') ||
            key.startsWith('workbox-') ||
            key.includes('flutter-app-cache')
          );
          await Promise.allSettled(
            flutterLikeKeys.map((key) => caches.delete(key)),
          );
        } catch (_) {
          // best-effort cleanup only
        }
      }
    }

    await clearFlutterServiceWorkerCaches();

    const configuredRepo = window.__llamadartBridgeAssetsRepo;
    const configuredTag = window.__llamadartBridgeAssetsTag;
    const bootstrapSearchParams = new URLSearchParams(window.location.search);
    const configuredMockBridgeScenario =
      typeof window.__llamadartMockBridgeScenario === 'string' &&
      window.__llamadartMockBridgeScenario.length > 0
        ? window.__llamadartMockBridgeScenario
        : bootstrapSearchParams.get('llamadart_mock_bridge');
    const configuredMockBridgeResponse =
      typeof window.__llamadartMockBridgeResponse === 'string' &&
      window.__llamadartMockBridgeResponse.length > 0
        ? window.__llamadartMockBridgeResponse
        : bootstrapSearchParams.get('llamadart_mock_response');
    const configuredMockBridgeDelayMs = Number(
      window.__llamadartMockBridgeDelayMs ??
        bootstrapSearchParams.get('llamadart_mock_delay_ms'),
    );
    const bridgeBootstrapVerbose =
      window.__llamadartBridgeBootstrapVerbose === true;
    const configuredThreadPoolSize = Number(window.__llamadartBridgeThreadPoolSize);
    const hardwareConcurrency = Number(window.navigator?.hardwareConcurrency);
    const inferredThreadPoolSize =
      window.crossOriginIsolated === true
        ? Number.isFinite(hardwareConcurrency) && hardwareConcurrency > 0
          ? Math.max(2, Math.min(4, Math.trunc(hardwareConcurrency)))
          : 2
        : 1;
    const bridgeThreadPoolSize =
      Number.isFinite(configuredThreadPoolSize) && configuredThreadPoolSize > 0
        ? Math.max(1, Math.trunc(configuredThreadPoolSize))
        : inferredThreadPoolSize;
    window.__llamadartBridgeThreadPoolSize = bridgeThreadPoolSize;

    function bridgeBootstrapLog(level, ...args) {
      if (!bridgeBootstrapVerbose || typeof console === 'undefined') {
        return;
      }

      const fn = console[level];
      if (typeof fn === 'function') {
        fn.apply(console, args);
      }
    }

    async function resolveCoreModuleUrl(moduleUrl) {
      const bridgeUrl = new URL(moduleUrl, window.location.href);
      const coreUrl = new URL('./llama_webgpu_core.js', bridgeUrl);
      const version = bridgeUrl.searchParams.get('v');
      if (version != null && version.length > 0) {
        coreUrl.searchParams.set('v', version);
      }
      const coreUrlString = coreUrl.toString();
      window.__llamadartBridgeCoreModuleUrl = coreUrlString;
      return coreUrlString;
    }

    function deriveCoreWasmUrl(moduleUrl, memory64 = false) {
      try {
        const url = new URL(moduleUrl, window.location.href);
        url.pathname = url.pathname.replace(
          /\/llama_webgpu_bridge\.js$/,
          memory64 ? '/llama_webgpu_core_mem64.wasm' : '/llama_webgpu_core.wasm',
        );
        return url.toString();
      } catch (_) {
        return null;
      }
    }

    const bridgeAssetsRepo =
      typeof configuredRepo === 'string' && configuredRepo.length > 0
        ? configuredRepo
        : 'leehack/llama-web-bridge-assets';
    const defaultBridgeAssetsTag = 'v0.1.82';
    const defaultBridgeLlamaCppTag = 'v0.8.0';
    const bridgeAssetsTag =
      typeof configuredTag === 'string' && configuredTag.length > 0
        ? configuredTag
        : defaultBridgeAssetsTag;
    function bridgeTagSupportsSpeechToText(tag) {
      const match = /^v(\d+)\.(\d+)\.(\d+)(?:$|-)/.exec(String(tag || ''));
      if (!match) return false;
      const major = Number(match[1]);
      const minor = Number(match[2]);
      const patch = Number(match[3]);
      return major > 0 || minor > 1 || (minor === 1 && patch >= 30);
    }
    const isOfficialBridgeAssetsRepo =
      bridgeAssetsRepo === 'leehack/llama-web-bridge-assets';
    window.__llamadartBridgeSpeechToTextSupported =
      typeof window.__llamadartBridgeSpeechToTextSupported === 'boolean'
        ? window.__llamadartBridgeSpeechToTextSupported
        : isOfficialBridgeAssetsRepo &&
          bridgeTagSupportsSpeechToText(bridgeAssetsTag);
    window.__llamadartLiteRtLmModuleUrl =
      typeof window.__llamadartLiteRtLmModuleUrl === 'string' &&
      window.__llamadartLiteRtLmModuleUrl.length > 0
        ? window.__llamadartLiteRtLmModuleUrl
        : 'https://cdn.jsdelivr.net/npm/@litert-lm/core@0.18.0/+esm';
    const localBridgeVersion =
      `${defaultBridgeAssetsTag}-local-${defaultBridgeLlamaCppTag}`;
    window.__llamadartBridgeLocalVersion = localBridgeVersion;

    const localBridgeUrl = `./webgpu_bridge/llama_webgpu_bridge.js?v=${localBridgeVersion}`;
    const cdnBridgeUrl = `https://cdn.jsdelivr.net/gh/${bridgeAssetsRepo}@${bridgeAssetsTag}/llama_webgpu_bridge.js`;
    const preferLocalBridgeRuntime =
      window.__llamadartPreferLocalBridgeRuntime === true ||
      window.location.hostname === '127.0.0.1' ||
      window.location.hostname === 'localhost';

    function deriveWorkerModuleUrl(moduleUrl) {
      try {
        const url = new URL(moduleUrl, window.location.href);
        url.pathname = url.pathname.replace(
          /\/llama_webgpu_bridge\.js$/,
          '/llama_webgpu_bridge_worker.js',
        );
        return url.toString();
      } catch (_) {
        return null;
      }
    }

    function deriveMem64CoreModuleUrl(moduleUrl) {
      try {
        const url = new URL(moduleUrl, window.location.href);
        url.pathname = url.pathname.replace(
          /\/llama_webgpu_bridge\.js$/,
          '/llama_webgpu_core_mem64.js',
        );
        return url.toString();
      } catch (_) {
        return null;
      }
    }

    function createMockBridgeClass({ scenario, responseText, delayMs }) {
      const encoder = new TextEncoder();
      const normalizedScenario = String(scenario || 'echo').trim().toLowerCase();
      const perChunkDelayMs = Number.isFinite(delayMs)
        ? Math.max(0, Math.min(1000, Math.trunc(delayMs)))
        : 0;

      function sleep(ms) {
        return new Promise((resolve) => setTimeout(resolve, ms));
      }

      function extractLastUserMessage(prompt) {
        if (typeof prompt !== 'string' || prompt.length === 0) {
          return 'hi';
        }

        const qwenMatches = [...prompt.matchAll(/<\|im_start\|>user\n([\s\S]*?)<\|im_end\|>/g)];
        if (qwenMatches.length > 0) {
          return String(qwenMatches[qwenMatches.length - 1][1] || '').trim() || 'hi';
        }

        const genericMatches = [...prompt.matchAll(/^user:\s*(.+)$/gm)];
        if (genericMatches.length > 0) {
          return String(genericMatches[genericMatches.length - 1][1] || '').trim() || 'hi';
        }

        return prompt.trim().split(/\s+/).slice(-8).join(' ') || 'hi';
      }

      function resolveResponse(prompt) {
        if (typeof responseText === 'string' && responseText.length > 0) {
          return responseText;
        }

        const lastUser = extractLastUserMessage(prompt);
        switch (normalizedScenario) {
          case 'qwen-weird':
          case 'weird':
            return 'ЯМ В В K K K K K K';
          case 'markdown':
            return '- mock bridge\n- browser smoke\n- deterministic output';
          case 'echo':
          default:
            return `Mock bridge reply: ${lastUser}`;
        }
      }

      function chunkText(text) {
        const symbols = Array.from(String(text || ''));
        const chunks = [];
        for (let i = 0; i < symbols.length; i += 3) {
          chunks.push(symbols.slice(i, i + 3).join(''));
        }
        return chunks.length > 0 ? chunks : [''];
      }

      return class MockLlamaWebGpuBridge {
        static supportsSafariAdaptiveGpu = false;

        constructor(_config = {}) {
          this._abortRequested = false;
          this._contextSize = 4096;
          this._modelUrl = null;
          this._metadata = {
            'general.name': 'Mock WebGPU Bridge',
            'llamadart.webgpu.runtime_notes': `mock_bridge:${normalizedScenario}`,
            'llamadart.webgpu.model_source': 'mock',
            'llamadart.webgpu.model_cache_state': 'disabled',
            'llamadart.webgpu.execution': 'mock',
          };
        }

        async loadModelFromUrl(url, options = {}) {
          this._abortRequested = false;
          this._modelUrl = String(url || '');
          const parsedContext = Number(options?.nCtx);
          this._contextSize = Number.isFinite(parsedContext) && parsedContext > 0
            ? Math.trunc(parsedContext)
            : 4096;
          window.__llamadartMockBridgeLastLoad = {
            url: this._modelUrl,
            options: { ...options },
            scenario: normalizedScenario,
          };
          return null;
        }

        async prefetchModelToCache(_url, _options = {}) {
          return null;
        }

        async evictModelFromCache(_url, _options = {}) {
          return null;
        }

        async createCompletion(prompt, options = {}) {
          const output = resolveResponse(prompt);
          const chunks = chunkText(output);
          const emitCurrentTextOnToken = options?.emitCurrentTextOnToken === true;
          const tokenEventEncoding = typeof options?.tokenEventEncoding === 'string'
            ? options.tokenEventEncoding
            : 'bytes';
          const onToken = typeof options?.onToken === 'function'
            ? options.onToken
            : null;

          this._abortRequested = false;
          window.__llamadartMockBridgeLastPrompt = String(prompt || '');
          window.__llamadartMockBridgeLastResponse = output;

          let currentText = '';
          for (const chunk of chunks) {
            if (this._abortRequested) {
              break;
            }
            currentText += chunk;
            if (onToken) {
              const payload = tokenEventEncoding === 'text'
                ? chunk
                : encoder.encode(chunk);
              onToken(payload, emitCurrentTextOnToken ? currentText : null);
            }
            if (perChunkDelayMs > 0) {
              await sleep(perChunkDelayMs);
            }
          }

          return currentText;
        }

        async loadMultimodalProjector(_url) {
          return null;
        }

        async unloadMultimodalProjector() {
          return null;
        }

        supportsVision() {
          return false;
        }

        supportsAudio() {
          return false;
        }

        async tokenize(text, _addSpecial = true) {
          return Array.from(encoder.encode(String(text || '')));
        }

        async detokenize(tokens, _special = false) {
          return new TextDecoder().decode(Uint8Array.from(tokens || []));
        }

        async embed(_text, _options = {}) {
          return [0.1, 0.2, 0.3];
        }

        async embedBatch(texts, _options = {}) {
          return Array.from(texts || []).map(() => [0.1, 0.2, 0.3]);
        }

        getModelMetadata() {
          return { ...this._metadata };
        }

        getContextSize() {
          return this._contextSize;
        }

        isGpuActive() {
          return true;
        }

        getBackendName() {
          return 'WEBGPU (Mock)';
        }

        setLogLevel(_level) {
          return null;
        }

        cancel() {
          this._abortRequested = true;
        }

        async dispose() {
          this._abortRequested = true;
          return null;
        }

        async applyChatTemplate(messages, addAssistant = true, _customTemplate = null) {
          const lines = [];
          for (const msg of messages || []) {
            lines.push(`${String(msg?.role || 'user')}: ${String(msg?.content || '')}`);
          }
          if (addAssistant) {
            lines.push('assistant: ');
          }
          return lines.join('\n');
        }
      };
    }

    // Deterministic bridge-readiness signal awaited by the Dart app so it never
    // races the asynchronous bridge import. Previously the app could observe a
    // missing `LlamaWebGpuBridge` global and silently fall back to a fake
    // "download" that cached nothing.
    let __resolveBridgeReady;
    let __rejectBridgeReady;
    window.__llamadartBridgeReady = false;
    window.__llamadartBridgeReadyPromise = new Promise((resolve, reject) => {
      __resolveBridgeReady = resolve;
      __rejectBridgeReady = reject;
    });
    // Attach a no-op rejection handler so a failure/timeout before the Dart
    // side awaits the promise does not surface as an unhandled rejection in the
    // console. The failure is still observable via __llamadartBridgeLoadError
    // and by awaiting __llamadartBridgeReadyPromise.
    window.__llamadartBridgeReadyPromise.catch(function () {});
    function markBridgeReady() {
      window.__llamadartBridgeReady = true;
      if (__resolveBridgeReady) {
        __resolveBridgeReady();
      }
    }
    function markBridgeFailed(detail) {
      window.__llamadartBridgeReady = false;
      window.__llamadartBridgeLoadError = detail;
      if (__rejectBridgeReady) {
        __rejectBridgeReady(new Error(detail));
      }
    }
    // Safety timeout so the Dart side never awaits readiness forever.
    setTimeout(function () {
      if (!window.__llamadartBridgeReady && !window.__llamadartBridgeLoadError) {
        markBridgeFailed('Bridge runtime did not become ready within 30s.');
      }
    }, 30000);

    async function loadBridge(moduleUrl, source) {
      const runtimeAssetModuleUrl = source === 'cdn' ? localBridgeUrl : moduleUrl;
      const coreModuleUrl = await resolveCoreModuleUrl(runtimeAssetModuleUrl);
      const mod = await import(moduleUrl);
      if (!mod?.LlamaWebGpuBridge) {
        throw new Error('Bridge module loaded but LlamaWebGpuBridge export was missing.');
      }

      const supportsDedicatedWorkerEntry =
        typeof mod.enableBridgeWorkerHost === 'function';
      const workerModuleUrl = supportsDedicatedWorkerEntry
        ? deriveWorkerModuleUrl(runtimeAssetModuleUrl)
        : null;
      const coreModuleUrlMem64 = deriveMem64CoreModuleUrl(runtimeAssetModuleUrl);
      const wasmUrl = deriveCoreWasmUrl(runtimeAssetModuleUrl);
      const wasmUrlMem64 = deriveCoreWasmUrl(runtimeAssetModuleUrl, true);
      const preferMemory64 = window.__llamadartBridgeEnableMem64 === true;

      window.LlamaWebGpuBridge = mod.LlamaWebGpuBridge;
      window.__llamadartBridgeAdaptiveSafariGpu =
        mod.LlamaWebGpuBridge?.supportsSafariAdaptiveGpu === true;
      window.__llamadartBridgeAssetSource = source;
      window.__llamadartBridgeModuleUrl = moduleUrl;
      window.__llamadartBridgeCoreModuleUrl = coreModuleUrl;
      window.__llamadartBridgeCoreModuleUrlMem64 = coreModuleUrlMem64;
      window.__llamadartBridgeWasmUrl = wasmUrl;
      window.__llamadartBridgeWasmUrlMem64 = wasmUrlMem64;
      window.__llamadartBridgeWorkerUrl = workerModuleUrl;
      window.__llamadartBridgePreferMemory64 = preferMemory64;
      window.__llamadartBridgeWorkerFallbackReason = null;
      window.__llamadartBridgeLoadError = null;
      markBridgeReady();
      bridgeBootstrapLog(
        'info',
        `llamadart: Web bridge runtime loaded (${source}), runtimeAssets=${source === 'cdn' ? 'local' : source}, worker=${workerModuleUrl ?? 'auto'}, mem64=${coreModuleUrlMem64 ?? 'none'}, preferMem64=${preferMemory64}, threadPool=${bridgeThreadPoolSize}`,
      );
    }

    if (configuredMockBridgeScenario) {
      window.LlamaWebGpuBridge = createMockBridgeClass({
        scenario: configuredMockBridgeScenario,
        responseText: configuredMockBridgeResponse,
        delayMs: configuredMockBridgeDelayMs,
      });
      window.__llamadartBridgeAdaptiveSafariGpu = false;
      window.__llamadartBridgeAssetSource = 'mock';
      window.__llamadartBridgeModuleUrl = null;
      window.__llamadartBridgeCoreModuleUrl = null;
      window.__llamadartBridgeCoreModuleUrlMem64 = null;
      window.__llamadartBridgeWasmUrl = null;
      window.__llamadartBridgeWasmUrlMem64 = null;
      window.__llamadartBridgeWorkerUrl = null;
      window.__llamadartBridgePreferMemory64 = false;
      window.__llamadartBridgeWorkerFallbackReason = null;
      window.__llamadartBridgeLoadError = null;
      markBridgeReady();
      bridgeBootstrapLog(
        'info',
        `llamadart: mock bridge runtime loaded (${configuredMockBridgeScenario})`,
      );
    } else {
      const primaryUrl = preferLocalBridgeRuntime ? localBridgeUrl : cdnBridgeUrl;
      const primarySource = preferLocalBridgeRuntime ? 'local' : 'cdn';
      const fallbackUrl = preferLocalBridgeRuntime ? cdnBridgeUrl : localBridgeUrl;
      const fallbackSource = preferLocalBridgeRuntime ? 'cdn' : 'local';

      let primaryError = null;
      loadBridge(primaryUrl, primarySource)
        .catch((err) => {
          primaryError = err;
          bridgeBootstrapLog(
            'warn',
            `llamadart: ${primarySource.toUpperCase()} bridge load failed, falling back to ${fallbackSource}`,
            err,
          );
          return loadBridge(fallbackUrl, fallbackSource);
        })
        .catch((fallbackErr) => {
          const detail =
            `${primarySource.toUpperCase()} load failed: ${String(primaryError)} | ` +
            `${fallbackSource.toUpperCase()} load failed: ${String(fallbackErr)}`;
          markBridgeFailed(detail);
          bridgeBootstrapLog('error', 'llamadart: failed to load bridge runtime', detail);
        });
    }
  </script>
  <script src="flutter_bootstrap.js" async></script>
</body>
</html>