// Lemonade Install Selector - Clean Rewrite
// Supports: Windows/Linux, App+Server/ServerOnly, OGA/llama.cpp/FastFlowLM, NPU/GPU/CPU

const ALLOWLIST = [
  // Windows: OGA (NPU, CPU), llama.cpp (CPU, GPU), FastFlowLM (NPU)
  { os: 'win', fw: 'oga', dev: 'npu' },
  { os: 'win', fw: 'oga', dev: 'cpu' },
  { os: 'win', fw: 'llama', dev: 'cpu' },
  { os: 'win', fw: 'llama', dev: 'gpu' },
  { os: 'win', fw: 'flm', dev: 'npu' },
  // Linux: llama.cpp (CPU, GPU), FastFlowLM (NPU)
  { os: 'linux', fw: 'llama', dev: 'cpu' },
  { os: 'linux', fw: 'llama', dev: 'gpu' },
  { os: 'linux', fw: 'flm', dev: 'npu' },
  // Docker: llama.cpp only (CPU, GPU)
  { os: 'docker', fw: 'llama', dev: 'cpu' },
  { os: 'docker', fw: 'llama', dev: 'gpu' },
  // macOS (beta): llama.cpp only (GPU via Metal)
  { os: 'macos', fw: 'llama', dev: 'gpu' },
];

const NPU_DRIVER_URL = 'https://account.amd.com/en/forms/downloads/ryzenai-eula-public-xef.html?filename=NPU_RAI1.5_280_WHQL.zip';
const GITHUB_RELEASES_API = 'https://api.github.com/repos/lemonade-sdk/lemonade/releases/latest';

// State: os, type, fw, dev, latestVersion
window.lmnState = { os: 'win', distro: 'win', type: 'app', fw: 'oga', dev: 'npu' };
window.lmnLatestVersion = null;

// Fetch latest version from GitHub
async function fetchLatestVersion() {
  try {
    const response = await fetch(GITHUB_RELEASES_API);
    const data = await response.json();
    // tag_name is like "v1.2.3" or "1.2.3"
    window.lmnLatestVersion = data.tag_name.replace(/^v/, '');
    lmnRender(); // Re-render with version
  } catch (e) {
    console.warn('Failed to fetch latest version:', e);
    window.lmnLatestVersion = 'VERSION'; // Fallback placeholder
  }
}

function isAllowed(os, fw, dev) {
  return ALLOWLIST.some(c => c.os === os && c.fw === fw && c.dev === dev);
}

function findValidCombo(os, fw, dev) {
  // Try exact match first
  if (isAllowed(os, fw, dev)) return { os, fw, dev };

  // Try keeping fw, find valid dev
  for (const d of ['npu', 'gpu', 'cpu']) {
    if (isAllowed(os, fw, d)) return { os, fw, dev: d };
  }

  // Try keeping dev, find valid fw
  for (const f of ['oga', 'llama', 'flm']) {
    if (isAllowed(os, f, dev)) return { os, fw: f, dev };
  }

  // Fall back to first valid combo for this OS
  const fallback = ALLOWLIST.find(c => c.os === os);
  return fallback || ALLOWLIST[0];
}

window.lmnSet = function(field, value) {
  const newState = { ...lmnState, [field]: value };

  // OS change may invalidate fw/dev combo
  if (field === 'os') {
    const valid = findValidCombo(value, newState.fw, newState.dev);
    newState.fw = valid.fw;
    newState.dev = valid.dev;
    if (value === 'linux') { newState.distro = 'ubuntu'; }
    else if (value === 'win') { newState.distro = 'win'; }
    else if (value === 'macos') { newState.distro = 'macos'}
  }
  // fw/dev change - validate
  else if (field === 'fw' || field === 'dev') {
    const valid = findValidCombo(newState.os, newState.fw, newState.dev);
    newState.fw = valid.fw;
    newState.dev = valid.dev;
  }

  window.lmnState = newState;
  lmnRender();
};

window.lmnRender = function() {
  const { os, type, fw, dev } = lmnState;

  // Update active states and disabled states
  const cells = {
    os: ['win', 'linux', 'macos', 'docker'],
    distro: ['win', 'macos', 'ubuntu', 'arch', 'fedora', 'debian'],
    type: ['app', 'server'],
    fw: ['oga', 'llama', 'flm'],
    dev: ['npu', 'gpu', 'cpu']
  };

  // Reset and set active
  Object.entries(cells).forEach(([category, options]) => {
    options.forEach(opt => {
      const el = document.getElementById(`${category}-${opt}`);
      if (!el) return;
      el.className = '';
      el.onclick = () => lmnSet(category, opt);
      if (lmnState[category] === opt) el.classList.add('lmn-active');
    });
  });

  // Update NPU label based on selected framework
  const npuEl = document.getElementById('dev-npu');
  if (npuEl) {
    npuEl.textContent = (fw === 'flm') ? 'NPU' : 'NPU, Hybrid';
  }

  // Gray out invalid combinations
  cells.fw.forEach(f => {
    const el = document.getElementById(`fw-${f}`);
    if (el && !isAllowed(os, f, dev) && !ALLOWLIST.some(c => c.os === os && c.fw === f)) {
      el.classList.add('lmn-disabled');
    }
  });

  cells.dev.forEach(d => {
    const el = document.getElementById(`dev-${d}`);
    if (el && !isAllowed(os, fw, d)) {
      el.classList.add('lmn-disabled');
    }
  });

  // Render download section
  renderDownload();

  // Render quick start commands
  renderQuickStart();
};

function renderDownload() {
  const { os, distro, type } = lmnState;
  const osDistro = document.getElementById('lmn-install-distro');
  const downloadArea = document.getElementById('lmn-download-area');
  const installType = document.getElementById('lmn-install-type');
  const cmdDiv = document.getElementById('lmn-command');
  const installCmdDiv = document.getElementById('lmn-install-commands');
  const version = window.lmnLatestVersion || 'VERSION';

  // Handle macOS (beta)
  if (os === 'macos') {
    if (osDistro) osDistro.style.display = 'none';
    if (installType) installType.style.display = 'none';

    const pkgFile = `Lemonade-${version}-Darwin.pkg`;
    const link = `https://github.com/lemonade-sdk/lemonade/releases/latest/download/${pkgFile}`;

    if (downloadArea) {
      downloadArea.style.display = 'block';
      const linkEl = document.getElementById('lmn-link');
      if (linkEl) {
        linkEl.href = link;
        linkEl.textContent = 'Download Lemonade Installer (.pkg)';
      }
    }
    if (installCmdDiv) installCmdDiv.style.display = 'none';

    let notes = '';
    notes += `<div class="lmn-note"><strong>Note:</strong> macOS support is currently in beta. The installer is signed and notarized for Apple Silicon Macs with Metal GPU acceleration.</div>`;
    notes += `<div class="lmn-note lmn-source-note">To build from source, see the <a href="https://github.com/lemonade-sdk/lemonade/blob/main/docs/dev-getting-started.md#building-from-source-on-macos-for-m-series--arm64-family" target="_blank">Developer Guide</a>.</div>`;

    if (cmdDiv) {
      cmdDiv.innerHTML = notes;
    }
    return;
  }

  if (os === 'win') {
    if (osDistro) osDistro.style.display = 'none';
    if (installType) installType.style.display = 'table-row';

    // Windows: Show download button
    let link, buttonText;
    if (type === 'app') {
      link = 'https://github.com/lemonade-sdk/lemonade/releases/latest/download/lemonade.msi';
      buttonText = 'Download Lemonade Installer (.msi)';
    } else {
      link = 'https://github.com/lemonade-sdk/lemonade/releases/latest/download/lemonade-server-minimal.msi';
      buttonText = 'Download Lemonade Minimal Installer (.msi)';
    }

    if (downloadArea) {
      downloadArea.style.display = 'block';
      const linkEl = document.getElementById('lmn-link');
      if (linkEl) {
        linkEl.href = link;
        linkEl.textContent = buttonText;
      }
    }
    if (installCmdDiv) {
      installCmdDiv.style.display = 'none';
    }
  }

  if (os === 'linux') {
    if (osDistro) osDistro.style.display = 'table-row';
    if (installType) installType.style.display = 'table-row';

    if (distro === 'ubuntu') {
      // Ubuntu: Show structured server + frontend installation
      const appImageFile = `lemonade-app-${version}-x86_64.AppImage`;
      const appImageUrl = `https://github.com/lemonade-sdk/lemonade/releases/latest/download/${appImageFile}`;

      if (downloadArea) {
        downloadArea.style.display = 'none';
      }
      if (installCmdDiv) {
        installCmdDiv.style.display = 'block';
        const ppaCommands = [
          'sudo add-apt-repository ppa:lemonade-team/stable',
          'sudo apt install lemonade-server'
        ];

        let frontendSection = '';
        if (type === 'app') {
          frontendSection = `
            <div class="lmn-install-section-title">Step 2: Choose your frontend</div>
            <div class="lmn-install-method-header">Option 1: Web App (default, available at <a href="http://localhost:13305" target="_blank">http://localhost:13305</a>)</div>
            <div class="lmn-note">The web app is automatically available once lemonade-server is running. Just open your browser and navigate to the URL above.</div>

            <div class="lmn-install-method-header">Option 2: Lemonade Desktop package (web app launcher)</div>
            <pre><code class="language-bash" id="lmn-install-desktop-block"></code></pre>

            <div class="lmn-install-method-header">Option 3: AppImage (portable desktop app, no installation required)</div>
            <pre><code class="language-bash" id="lmn-install-appimage-block"></code></pre>

            <div class="lmn-install-method-header">Option 4: Snap (fully sandboxed desktop app)</div>
            <pre><code class="language-bash" id="lmn-install-snap-app-block"></code></pre>
          `;
        }

        installCmdDiv.innerHTML = `
          <div class="lmn-install-section-title">Step 1: Install lemonade-server</div>
          <div class="lmn-install-method-header">Via stable PPA (recommended):</div>
          <pre><code class="language-bash" id="lmn-install-pre-block"></code></pre>
          <div class="lmn-install-method-header">Or via Snap:</div>
          <pre><code class="language-bash" id="lmn-install-snap-server-block"></code></pre>
          ${frontendSection}
        `;

        setTimeout(() => {
          // Render PPA commands
          const pre = document.getElementById('lmn-install-pre-block');
          if (pre) {
            pre.innerHTML = ppaCommands.map((line, idx) => {
              const safeLine = line.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
              return `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyInstallLine(event, ${idx})">📋</button></div>`;
            }).join('');
          }

          // Render server snap command
          const serverSnapPre = document.getElementById('lmn-install-snap-server-block');
          if (serverSnapPre) {
            const serverSnapCmd = 'sudo snap install lemonade-server';
            const safeLine = serverSnapCmd.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
            serverSnapPre.innerHTML = `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyServerSnapLine(event)">📋</button></div>`;
          }

          // Render AppImage commands if App + Server selected
          if (type === 'app') {
            const desktopPre = document.getElementById('lmn-install-desktop-block');
            if (desktopPre) {
              const desktopCmd = 'sudo apt install lemonade-desktop';
              const safeLine = desktopCmd.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
              desktopPre.innerHTML = `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyDesktopLine(event)">📋</button></div>`;
            }

            const appImagePre = document.getElementById('lmn-install-appimage-block');
            if (appImagePre) {
              const appImageCommands = [
                `wget ${appImageUrl}`,
                `chmod +x ${appImageFile}`,
                `./${appImageFile}`
              ];
              appImagePre.innerHTML = appImageCommands.map((cmd, idx) => {
                const safeLine = cmd.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
                return `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyAppImageLine(event, ${idx})">📋</button></div>`;
              }).join('');
            }

            // Render app snap command
            const appSnapPre = document.getElementById('lmn-install-snap-app-block');
            if (appSnapPre) {
              const appSnapCmd = 'sudo snap install lemonade';
              const safeLine = appSnapCmd.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
              appSnapPre.innerHTML = `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyAppSnapLine(event)">📋</button></div>`;
            }
          }
        }, 0);
      }
    } else if (distro === 'arch') {
      // Arch Linux: Show download button
      let link, buttonText;
      if (type === 'app') {
        link = 'https://aur.archlinux.org/packages/lemonade-desktop';
        buttonText = 'Download Lemonade Desktop (AUR)';
      } else {
        link = 'https://aur.archlinux.org/packages/lemonade-server';
        buttonText = 'Download Lemonade Server (AUR)';
      }

      if (downloadArea) {
        downloadArea.style.display = 'block';
        const linkEl = document.getElementById('lmn-link');
        if (linkEl) {
          linkEl.href = link;
          linkEl.target = '_blank';
          linkEl.textContent = buttonText;
        }
      }
      if (installCmdDiv) {
        installCmdDiv.style.display = 'none';
      }
    } else if (distro === 'fedora') {
      // Fedora: Show structured server + frontend installation
      const rpmFile = `lemonade-server-${version}.x86_64.rpm`;
      const appImageFile = `lemonade-app-${version}-x86_64.AppImage`;
      const downloadUrl = `https://github.com/lemonade-sdk/lemonade/releases/latest/download/${rpmFile}`;
      const appImageUrl = `https://github.com/lemonade-sdk/lemonade/releases/latest/download/${appImageFile}`;

      if (downloadArea) {
        downloadArea.style.display = 'none';
      }
      if (installCmdDiv) {
        installCmdDiv.style.display = 'block';
        const rpmCommands = [
          `wget ${downloadUrl}`,
          `sudo dnf install ./${rpmFile}`
        ];

        let frontendSection = '';
        if (type === 'app') {
          frontendSection = `
            <div class="lmn-install-section-title">Step 2: Choose your frontend</div>
            <div class="lmn-install-method-header">Option 1: Web App (default, available at <a href="http://localhost:13305" target="_blank">http://localhost:13305</a>)</div>
            <div class="lmn-note">The web app is automatically available once lemonade-server is running. Just open your browser and navigate to the URL above.</div>

            <div class="lmn-install-method-header">Option 2: AppImage (portable desktop app, no installation required)</div>
            <pre><code class="language-bash" id="lmn-install-appimage-block"></code></pre>
          `;
        }

        installCmdDiv.innerHTML = `
          <div class="lmn-install-section-title">Step 1: Install lemonade-server</div>
          <div class="lmn-install-method-header">Via RPM package:</div>
          <pre><code class="language-bash" id="lmn-install-pre-block"></code></pre>
          ${frontendSection}
        `;

        setTimeout(() => {
          // Render rpm commands
          const pre = document.getElementById('lmn-install-pre-block');
          if (pre) {
            pre.innerHTML = rpmCommands.map((line, idx) => {
              const safeLine = line.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
              return `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyInstallLine(event, ${idx})">📋</button></div>`;
            }).join('');
          }

          // Render AppImage commands if App + Server selected
          if (type === 'app') {
            const appImagePre = document.getElementById('lmn-install-appimage-block');
            if (appImagePre) {
              const appImageCommands = [
                `wget ${appImageUrl}`,
                `chmod +x ${appImageFile}`,
                `./${appImageFile}`
              ];
              appImagePre.innerHTML = appImageCommands.map((cmd, idx) => {
                const safeLine = cmd.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
                return `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyAppImageLine(event, ${idx})">📋</button></div>`;
              }).join('');
            }
          }
        }, 0);
      }
    } else if (distro === 'debian') {
      if (downloadArea) downloadArea.style.display = 'none';
      if (installCmdDiv) installCmdDiv.style.display = 'none';
      if (cmdDiv) {
        cmdDiv.innerHTML = `<div class="lmn-coming-soon">For Debian, please follow the build instructions as described in the <a href="https://github.com/lemonade-sdk/lemonade/blob/main/docs/dev-getting-started.md#building-from-source" target="_blank">Developer Guide</a>.</div>`;
      }
      return;
    }
  }

  if (os === 'docker') {
    if (osDistro) osDistro.style.display = 'none';

    if (installType) installType.style.display = 'none';

    if (downloadArea) {
      downloadArea.style.display = 'none';
    }
    if (installCmdDiv) {
      installCmdDiv.style.display = 'block';
      const commands = [
        `docker run -d \\`,
          `  --name lemonade-server \\`,
          `  -p 13305:13305 \\`,
          `  -v lemonade-cache:/root/.cache/huggingface \\`,
          `  -v lemonade-llama:/opt/lemonade/llama \\`,
          `  ghcr.io/lemonade-sdk/lemonade-server:latest`
      ];

      installCmdDiv.innerHTML = `<pre><code class="language-bash" id="lmn-install-pre-block"></code></pre>`;

      setTimeout(() => {
        const pre = document.getElementById('lmn-install-pre-block');
        if (pre) {
          pre.innerHTML = commands.map((line, idx) => {
            const safeLine = line.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
            // Only show copy button on first line
            const button = idx === 0 ? `<button class="lmn-copy-btn" title="Copy" onclick="lmnCopyAllInstall(event)">📋</button>` : '';
            return `<div class="lmn-command-line"><span>${safeLine}</span>${button}</div>`;
          }).join('');
        }
      }, 0);
    }

    let dockerNote = `<div class="lmn-note lmn-source-note">To build from source, see the <a href="https://github.com/lemonade-sdk/lemonade/blob/main/src/cpp/DOCKER_GUIDE.md" target="_blank">Docker Guide</a>`;
    if (cmdDiv) {
      cmdDiv.innerHTML = dockerNote;
    }

    return;
  } else {
    // Hide Docker section for other platforms
    const dockerSection = document.getElementById('lmn-docker-section');
    if (dockerSection) dockerSection.style.display = 'none';
  }

  // Build from source note (only depends on os and type)
  let notes = '';

  // Add Ubuntu-specific note if Ubuntu is selected
  if (os === 'linux' && distro === 'ubuntu') {
    notes += `<div class="lmn-note">Lemonade is tested on Ubuntu 24.04 LTS but should also work on other versions.</div>`;
  }

  notes += `<div class="lmn-note lmn-source-note">To build from source, see the <a href="https://github.com/lemonade-sdk/lemonade/blob/main/docs/dev-getting-started.md" target="_blank">Developer Guide</a>`;
  if (type === 'app') {
    notes += ` and <a href="https://github.com/lemonade-sdk/lemonade/blob/main/src/app/README.md" target="_blank">App README</a>`;
  }
  notes += `.</div>`;

  if (cmdDiv) {
    cmdDiv.innerHTML = notes;
  }
}

window.lmnCopyAppImageLine = function(e, idx) {
  e.stopPropagation();
  const pre = document.getElementById('lmn-install-appimage-block');
  if (!pre) return;
  const lines = Array.from(pre.querySelectorAll('.lmn-command-line span')).map(span => span.textContent);
  if (lines[idx] !== undefined) {
    navigator.clipboard.writeText(lines[idx]);
    const btn = e.currentTarget;
    const old = btn.textContent;
    btn.textContent = '✔';
    setTimeout(() => { btn.textContent = old; }, 900);
  }
};

window.lmnCopyServerSnapLine = function(e) {
  e.stopPropagation();
  const pre = document.getElementById('lmn-install-snap-server-block');
  if (!pre) return;
  const line = pre.querySelector('.lmn-command-line span');
  if (line) {
    navigator.clipboard.writeText(line.textContent);
    const btn = e.currentTarget;
    const old = btn.textContent;
    btn.textContent = '✔';
    setTimeout(() => { btn.textContent = old; }, 900);
  }
};

window.lmnCopyAppSnapLine = function(e) {
  e.stopPropagation();
  const pre = document.getElementById('lmn-install-snap-app-block');
  if (!pre) return;
  const line = pre.querySelector('.lmn-command-line span');
  if (line) {
    navigator.clipboard.writeText(line.textContent);
    const btn = e.currentTarget;
    const old = btn.textContent;
    btn.textContent = '✔';
    setTimeout(() => { btn.textContent = old; }, 900);
  }
};

window.lmnCopyDesktopLine = function(e) {
  e.stopPropagation();
  const pre = document.getElementById('lmn-install-desktop-block');
  if (!pre) return;
  const line = pre.querySelector('.lmn-command-line span');
  if (line) {
    navigator.clipboard.writeText(line.textContent);
    const btn = e.currentTarget;
    const old = btn.textContent;
    btn.textContent = '✔';
    setTimeout(() => { btn.textContent = old; }, 900);
  }
};

window.lmnCopyInstallLine = function(e, idx) {
  e.stopPropagation();
  const pre = document.getElementById('lmn-install-pre-block');
  if (!pre) return;
  const lines = Array.from(pre.querySelectorAll('.lmn-command-line span')).map(span => span.textContent);
  if (lines[idx] !== undefined) {
    navigator.clipboard.writeText(lines[idx]);
    const btn = e.currentTarget;
    const old = btn.textContent;
    btn.textContent = '✔';
    setTimeout(() => { btn.textContent = old; }, 900);
  }
};

window.lmnCopyAllInstall = function(e) {
  e.stopPropagation();
  const pre = document.getElementById('lmn-install-pre-block');
  if (!pre) return;
  const lines = Array.from(pre.querySelectorAll('.lmn-command-line span')).map(span => span.textContent);
  if (lines !== undefined) {
    // Join with newlines instead of commas for proper formatting
    navigator.clipboard.writeText(lines.join('\n'));
    const btn = e.currentTarget;
    const old = btn.textContent;
    btn.textContent = '✔';
    setTimeout(() => { btn.textContent = old; }, 900);
  }
};

function renderQuickStart() {
  const { os, fw, dev } = lmnState;
  const exploreDiv = document.getElementById('lmn-explore-command');
  const exploreSection = document.getElementById('lmn-explore-section');

  if (!exploreDiv || !exploreSection) return;

  // macOS quick start
  if (os === 'macos') {
    exploreSection.style.display = 'block';
  }

  let commands = ['lemonade-server -h'];

  if (fw === 'oga') {
    if (dev === 'npu') {
      commands.push('lemonade-server run Llama-3.2-1B-Instruct-NPU');
      commands.push('lemonade-server run Llama-3.2-1B-Instruct-Hybrid');
    } else {
      commands.push('lemonade-server run Llama-3.2-1B-Instruct-CPU');
    }
  } else if (fw === 'llama') {
    if (dev === 'cpu') {
      commands.push('lemonade-server run Gemma-3-4b-it-GGUF --llamacpp cpu');
    } else {
      commands.push('lemonade-server run Gemma-3-4b-it-GGUF');
    }
  } else if (fw === 'flm') {
    commands.push('lemonade-server run Gemma-3-4b-it-FLM');
  }

  exploreSection.style.display = 'block';
  exploreDiv.innerHTML = `<pre><code class="language-bash" id="lmn-explore-pre-block"></code></pre>`;

  // Add contextual notes based on inference engine and device
  let notes = '';

  // NPU driver note (Windows only)
  if (dev === 'npu' && os === 'win') {
    notes += `<div class="lmn-note"><strong>Note:</strong> NPU requires an AMD Ryzen AI 300-series PC with Windows 11 and driver installation. Download and install the <a href="${NPU_DRIVER_URL}" target="_blank">NPU Driver</a> before proceeding.</div>`;
  }

  // FLM Linux NPU setup note (above Early Access notice, matching Windows driver note placement)
  if (fw === 'flm' && os === 'linux') {
    notes += `<div class="lmn-note"><strong>Linux NPU Setup:</strong> See the <a href="https://lemonade-server.ai/flm_npu_linux.html" target="_blank">FastFlowLM NPU on Linux guide</a> for setup instructions.</div>`;
  }

  // FastFlowLM Early Access note
  if (fw === 'flm') {
    notes += `<div class="lmn-note"><strong><a href="https://github.com/FastFlowLM/FastFlowLM" target="_blank">FastFlowLM (FLM)</a> support in Lemonade is in Early Access.</strong> FLM is free for non-commercial use, however note that commercial licensing terms apply. Installing an FLM model will automatically launch the FLM installer, which will require you to accept the FLM license terms to continue. Contact <a href="mailto:lemonade@amd.com">lemonade@amd.com</a> for inquiries.</div>`;
  }

  // llama.cpp backend tip for GPU
  if (fw === 'llama' && dev === 'gpu') {
    notes += `<div class="lmn-note"><strong>Tip:</strong> To select a backend, use <code>--llamacpp rocm</code> or <code>--llamacpp vulkan</code></div>`;
    if (os === 'linux') {
      notes += `<div class="lmn-note"><strong>Note:</strong> You may need to run <code>sudo update-pciids</code> for GPU detection on Linux.</div>`;
    }
  }

  // backend config for docker
  if (os === 'docker') {
    commands = [];

    if (fw === 'llama' && dev === 'gpu') {
      commands.push(`docker run -d \\
  --name lemonade-server \\
  -p 13305:13305 \\
  -v lemonade-cache:/root/.cache/huggingface \\
  -v lemonade-llama:/opt/lemonade/llama \\
  -e LEMONADE_LLAMACPP_BACKEND=vulkan \\
  ghcr.io/lemonade-sdk/lemonade-server:latest`);
      notes = `<div class="lmn-note"><strong>Tip:</strong> To select a specific backend, update the LEMONADE_LLAMACPP_BACKEND environment variable: <code>LEMONADE_LLAMACPP_BACKEND=vulkan</code></div>`;
    }

    if (fw === 'llama' && dev === 'cpu') {
      commands.push(`docker run -d \\
  --name lemonade-server \\
  -p 13305:13305 \\
  -v lemonade-cache:/root/.cache/huggingface \\
  -v lemonade-llama:/opt/lemonade/llama \\
  -e LEMONADE_LLAMACPP_BACKEND=cpu \\
  ghcr.io/lemonade-sdk/lemonade-server:latest`);
      notes = `<div class="lmn-note"><strong>Tip:</strong> To select a specific backend, update the LEMONADE_LLAMACPP_BACKEND environment variable: <code>LEMONADE_LLAMACPP_BACKEND=cpu</code></div>`;
    }
  }

  if (notes) {
    exploreDiv.innerHTML += notes;
  }

  setTimeout(() => {
    const pre = document.getElementById('lmn-explore-pre-block');
    if (pre) {
      pre.innerHTML = commands.map((line, idx) => {
        const safeLine = line.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
        return `<div class="lmn-command-line"><span>${safeLine}</span><button class="lmn-copy-btn" title="Copy" onclick="lmnCopyLine(event, ${idx})">📋</button></div>`;
      }).join('');
    }
  }, 0);
}

window.lmnCopyLine = function(e, idx) {
  e.stopPropagation();
  const pre = document.getElementById('lmn-explore-pre-block');
  if (!pre) return;
  const lines = Array.from(pre.querySelectorAll('.lmn-command-line span')).map(span => span.textContent);
  if (lines[idx] !== undefined) {
    navigator.clipboard.writeText(lines[idx]);
    const btn = e.currentTarget;
    const old = btn.textContent;
    btn.textContent = '✔';
    setTimeout(() => { btn.textContent = old; }, 900);
  }
};

// Parse URL hash and set appropriate state
function parseHashAndSetState() {
  const hash = window.location.hash.substring(1).toLowerCase(); // Remove # and make lowercase

  if (!hash) return; // No hash, use defaults

  // Handle anchors
  switch (hash) {
    case 'linux':
      lmnSet('os', 'linux');
      break;
    case 'ubuntu':
      lmnSet('os', 'linux');
      lmnSet('distro', 'ubuntu');
      break;
    case 'arch':
      lmnSet('os', 'linux');
      lmnSet('distro', 'arch');
      break;
    case 'debian':
      lmnSet('os', 'linux');
      lmnSet('distro', 'debian');
      break;
    case 'fedora':
      lmnSet('os', 'linux');
      lmnSet('distro', 'fedora');
      break;
    case 'docker':
      lmnSet('os', 'docker');
      break;
    case 'windows':
    case 'win':
      lmnSet('os', 'win');
      break;
    case 'macos':
    case 'mac':
      lmnSet('os', 'macos');
      break;
  }
}

window.lmnInit = function() {
  const installer = document.getElementById('lmn-installer');
  if (installer && !document.getElementById('os-win')) {
    installer.innerHTML = `
      <div class="lmn-content-section">
        <div class="lmn-section-header">Download & Install</div>
        <table class="lmn-installer-table lmn-embedded-table">
          <tr>
            <td class="lmn-label">Platform</td>
            <td id="os-win" class="lmn-active">Windows 11</td>
            <td id="os-linux">Linux</td>
            <td id="os-macos">macOS</td>
            <td id="os-docker">Docker</td>
          </tr>
          <tr id="lmn-install-distro" style="display: none;">
            <td class="lmn-label">Linux Distribution</td>
            <td id="distro-ubuntu" class="lmn-active">Ubuntu 24.04+</td>
            <td id="distro-arch">Arch Linux</td>
            <td id="distro-fedora">Fedora 43</td>
            <td id="distro-debian">Debian Trixie+</td>
          </tr>
          <tr id="lmn-install-type">
            <td class="lmn-label">Installation Type</td>
            <td id="type-app" colspan="2" class="lmn-active">App + Server</td>
            <td id="type-server" colspan="2">Server Only</td>
          </tr>
        </table>
        <div id="lmn-download-area" class="lmn-download-section">
          <a id="lmn-link" href="#">Download</a>
        </div>
        <div id="lmn-install-commands" class="lmn-command" style="display: none;"></div>
        <div id="lmn-command" class="lmn-command"></div>
      </div>
      <div id="lmn-explore-section" class="lmn-content-section">
        <div class="lmn-section-header lmn-explore-header">Quick Start</div>
        <table class="lmn-installer-table lmn-embedded-table">
          <tr>
            <td class="lmn-label">Inference Engine</td>
            <td id="fw-oga" class="lmn-active">OGA</td>
            <td id="fw-llama">llama.cpp</td>
            <td id="fw-flm">FastFlowLM</td>
          </tr>
          <tr>
            <td class="lmn-label">Device Support</td>
            <td id="dev-npu" class="lmn-active">NPU, Hybrid</td>
            <td id="dev-gpu">GPU</td>
            <td id="dev-cpu">CPU</td>
          </tr>
        </table>
        <div id="lmn-explore-command" class="lmn-command"></div>
      </div>
    `;
  }

  // Listen for hash changes
  window.addEventListener('hashchange', parseHashAndSetState);

  // Parse hash on initial load (after HTML is set up)
  parseHashAndSetState();

  fetchLatestVersion();
  lmnRender();
};
