const fs = require('fs');
const path = require('path');

function getBundledFontWoff2Path(familyKey, weight) {
  // Renderer can read directly from disk because nodeIntegration is on.
  // Try repo-relative first, then packaged app.asar mirror.
  const familyDir = familyKey === 'fira-code' ? 'FiraCode' : 'JetBrainsMono';
  const weightName = weight >= 700 ? 'Bold' : 'Regular';
  const filename = `${familyDir}-${weightName}.woff2`;
  const repoPath = path.resolve(__dirname, '..', 'assets', 'fonts', filename);
  if (fs.existsSync(repoPath)) return repoPath;
  // Packaged: under <resourcesPath>/assets/fonts/
  if (process.resourcesPath) {
    const packaged = path.join(process.resourcesPath, 'assets', 'fonts', filename);
    if (fs.existsSync(packaged)) return packaged;
  }
  return null;
}

function buildFontFaceBlock(familyKey) {
  const family = familyKey === 'fira-code' ? 'Fira Code' : 'JetBrains Mono';
  const fontPath = getBundledFontWoff2Path(familyKey, 400);
  if (!fontPath) return '';
  try {
    const data = fs.readFileSync(fontPath);
    const dataUri = `data:font/woff2;base64,${data.toString('base64')}`;
    return `@font-face { font-family: '${family}'; font-weight: 400; font-style: normal; src: url('${dataUri}') format('woff2'); }`;
  } catch (_) {
    return '';
  }
}

class PrintPreview {
  constructor(monospaceSettings = {}) {
    this.overlay = document.getElementById('print-preview-overlay');
    this.modal = window.modals?.printPreviewModal;
    this._lastContent = '';
    this._monospaceSettings = {
      monospaceFont: monospaceSettings.monospaceFont || 'jetbrains-mono',
      monospaceLigatures: monospaceSettings.monospaceLigatures === true,
    };
    this.setupEventListeners();
  }

  setMonospaceSettings(settings) {
    this._monospaceSettings = {
      monospaceFont: (settings && settings.monospaceFont) || 'jetbrains-mono',
      monospaceLigatures: !!(settings && settings.monospaceLigatures === true),
    };
    this.refreshPreview();
  }

  open(htmlContent) {
    this._lastContent = htmlContent;
    if (this.modal) {
      this.modal.open();
    } else {
      this.overlay.classList.remove('hidden');
    }
    this.updatePreview(htmlContent);
    this.updateScaleLabel();
  }

  close() {
    if (this.modal) {
      this.modal.close();
    } else {
      this.overlay.classList.add('hidden');
    }
  }

  setupEventListeners() {
    document.getElementById('print-preview-close')?.addEventListener('click', () => this.close());
    document.getElementById('print-cancel')?.addEventListener('click', () => this.close());
    document.getElementById('print-execute')?.addEventListener('click', () => this.executePrint());

    // Update preview on option changes
    ['print-paper-size', 'print-orientation', 'print-margins'].forEach((id) => {
      document.getElementById(id)?.addEventListener('change', () => this.refreshPreview());
    });

    // Scale slider
    const scaleSlider = document.getElementById('print-scale');
    scaleSlider?.addEventListener('input', () => this.updateScaleLabel());

    // Page range toggle
    document.getElementById('print-pages')?.addEventListener('change', (e) => {
      const rangeInput = document.getElementById('print-page-range');
      if (rangeInput) {
        rangeInput.classList.toggle('hidden', e.target.value !== 'custom');
      }
    });

    // Note: Backdrop click and Escape key are now handled by ModalManager
  }

  updateScaleLabel() {
    const scale = document.getElementById('print-scale')?.value || 100;
    const label = document.getElementById('print-scale-value');
    if (label) label.textContent = `${scale}%`;
  }

  updatePreview(htmlContent) {
    const frame = document.getElementById('print-preview-frame');
    if (!frame) return;

    this._lastContent = htmlContent;

    const orientation = document.getElementById('print-orientation')?.value || 'portrait';
    const paperSize = document.getElementById('print-paper-size')?.value || 'A4';

    // Get dimensions for paper size
    const sizes = {
      A3: { width: '297mm', height: '420mm' },
      A4: { width: '210mm', height: '297mm' },
      A5: { width: '148mm', height: '210mm' },
      Letter: { width: '8.5in', height: '11in' },
      Legal: { width: '8.5in', height: '14in' },
      Tabloid: { width: '11in', height: '17in' },
    };

    const size = sizes[paperSize] || sizes['A4'];
    const width = orientation === 'landscape' ? size.height : size.width;
    const height = orientation === 'landscape' ? size.width : size.height;

    const family = this._monospaceSettings.monospaceFont === 'fira-code' ? 'Fira Code' : 'JetBrains Mono';
    const ligaturesOn = this._monospaceSettings.monospaceLigatures === true;
    const featureSettings = ligaturesOn ? 'normal' : "'liga' 0, 'calt' 0, 'dlig' 0";
    const fontFaceBlock = buildFontFaceBlock(this._monospaceSettings.monospaceFont);

    const previewHtml = `
            <!DOCTYPE html>
            <html>
            <head>
                <style>
                    ${fontFaceBlock}
                    body {
                        margin: 20px;
                        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
                        font-size: 14px;
                        line-height: 1.6;
                    }
                    @page { size: ${width} ${height}; }
                    pre, code, kbd, samp {
                        font-family: '${family}', monospace;
                        font-feature-settings: ${featureSettings};
                    }
                    pre {
                        background: #f5f5f5;
                        padding: 12px;
                        border-radius: 6px;
                        overflow-x: auto;
                        white-space: pre;
                        tab-size: 4;
                    }
                    code { background: #f0f0f0; padding: 2px 6px; border-radius: 3px; font-size: 13px; }
                    pre code { background: none; padding: 0; }
                    table { border-collapse: collapse; width: 100%; }
                    th, td { border: 1px solid #ddd; padding: 8px; }
                    blockquote { border-left: 4px solid #ddd; margin-left: 0; padding-left: 16px; color: #666; }
                    img { max-width: 100%; }
                    h1, h2, h3 { margin-top: 1.5em; }
                </style>
            </head>
            <body>${htmlContent || ''}</body>
            </html>
        `;

    frame.srcdoc = previewHtml;
  }

  refreshPreview() {
    if (this._lastContent) {
      this.updatePreview(this._lastContent);
    }
  }

  getOptions() {
    return {
      paperSize: document.getElementById('print-paper-size')?.value || 'A4',
      orientation: document.getElementById('print-orientation')?.value || 'portrait',
      margins: document.getElementById('print-margins')?.value || 'default',
      scale: parseInt(document.getElementById('print-scale')?.value || '100'),
      headers: document.getElementById('print-headers')?.checked ?? true,
      background: document.getElementById('print-background')?.checked ?? true,
      pages: document.getElementById('print-pages')?.value || 'all',
      pageRange: document.getElementById('print-page-range')?.value || '',
    };
  }

  executePrint() {
    const options = this.getOptions();
    const { ipcRenderer } = require('electron');
    ipcRenderer.send('do-print-with-options', options);
    this.close();
  }
}

module.exports = { PrintPreview };