/**
 * ANSI escape code to HTML converter.
 *
 * Converts terminal ANSI color/style codes to HTML with inline styles.
 * Supports:
 * - Standard foreground colors (30-37) and bright variants (90-97)
 * - Standard background colors (40-47) and bright variants (100-107)
 * - 256-color palette (38;5;N and 48;5;N)
 * - RGB true color (38;2;R;G;B and 48;2;R;G;B)
 * - Text styles: bold (1), dim (2), italic (3), underline (4)
 * - Reset (0)
 */
// Standard ANSI color palette (0-15)
const ANSI_COLORS = [
  "#000000", // 0: black
  "#800000", // 1: red
  "#008000", // 2: green
  "#808000", // 3: yellow
  "#000080", // 4: blue
  "#800080", // 5: magenta
  "#008080", // 6: cyan
  "#c0c0c0", // 7: white
  "#808080", // 8: bright black
  "#ff0000", // 9: bright red
  "#00ff00", // 10: bright green
  "#ffff00", // 11: bright yellow
  "#0000ff", // 12: bright blue
  "#ff00ff", // 13: bright magenta
  "#00ffff", // 14: bright cyan
  "#ffffff", // 15: bright white
];
/**
 * Convert 256-color index to hex.
 */
function color256ToHex(index) {
  // Standard colors (0-15)
  if (index < 16) {
    return ANSI_COLORS[index];
  }
  // Color cube (16-231): 6x6x6 = 216 colors
  if (index < 232) {
    const cubeIndex = index - 16;
    const r = Math.floor(cubeIndex / 36);
    const g = Math.floor((cubeIndex % 36) / 6);
    const b = cubeIndex % 6;
    const toComponent = (n) => (n === 0 ? 0 : 55 + n * 40);
    const toHex = (n) => toComponent(n).toString(16).padStart(2, "0");
    return `#${toHex(r)}${toHex(g)}${toHex(b)}`;
  }
  // Grayscale (232-255): 24 shades
  const gray = 8 + (index - 232) * 10;
  const grayHex = gray.toString(16).padStart(2, "0");
  return `#${grayHex}${grayHex}${grayHex}`;
}
/**
 * Escape HTML special characters.
 */
function escapeHtml(text) {
  return text
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&#039;");
}
function createEmptyStyle() {
  return {
    fg: null,
    bg: null,
    bold: false,
    dim: false,
    italic: false,
    underline: false,
  };
}
function styleToInlineCSS(style) {
  const parts = [];
  if (style.fg) parts.push(`color:${style.fg}`);
  if (style.bg) parts.push(`background-color:${style.bg}`);
  if (style.bold) parts.push("font-weight:bold");
  if (style.dim) parts.push("opacity:0.6");
  if (style.italic) parts.push("font-style:italic");
  if (style.underline) parts.push("text-decoration:underline");
  return parts.join(";");
}
function hasStyle(style) {
  return (
    style.fg !== null ||
    style.bg !== null ||
    style.bold ||
    style.dim ||
    style.italic ||
    style.underline
  );
}
/**
 * Parse ANSI SGR (Select Graphic Rendition) codes and update style.
 */
function applySgrCode(params, style) {
  let i = 0;
  while (i < params.length) {
    const code = params[i];
    if (code === 0) {
      // Reset all
      style.fg = null;
      style.bg = null;
      style.bold = false;
      style.dim = false;
      style.italic = false;
      style.underline = false;
    } else if (code === 1) {
      style.bold = true;
    } else if (code === 2) {
      style.dim = true;
    } else if (code === 3) {
      style.italic = true;
    } else if (code === 4) {
      style.underline = true;
    } else if (code === 22) {
      // Reset bold/dim
      style.bold = false;
      style.dim = false;
    } else if (code === 23) {
      style.italic = false;
    } else if (code === 24) {
      style.underline = false;
    } else if (code >= 30 && code <= 37) {
      // Standard foreground colors
      style.fg = ANSI_COLORS[code - 30];
    } else if (code === 38) {
      // Extended foreground color
      if (params[i + 1] === 5 && params.length > i + 2) {
        // 256-color: 38;5;N
        style.fg = color256ToHex(params[i + 2]);
        i += 2;
      } else if (params[i + 1] === 2 && params.length > i + 4) {
        // RGB: 38;2;R;G;B
        const r = params[i + 2];
        const g = params[i + 3];
        const b = params[i + 4];
        style.fg = `rgb(${r},${g},${b})`;
        i += 4;
      }
    } else if (code === 39) {
      // Default foreground
      style.fg = null;
    } else if (code >= 40 && code <= 47) {
      // Standard background colors
      style.bg = ANSI_COLORS[code - 40];
    } else if (code === 48) {
      // Extended background color
      if (params[i + 1] === 5 && params.length > i + 2) {
        // 256-color: 48;5;N
        style.bg = color256ToHex(params[i + 2]);
        i += 2;
      } else if (params[i + 1] === 2 && params.length > i + 4) {
        // RGB: 48;2;R;G;B
        const r = params[i + 2];
        const g = params[i + 3];
        const b = params[i + 4];
        style.bg = `rgb(${r},${g},${b})`;
        i += 4;
      }
    } else if (code === 49) {
      // Default background
      style.bg = null;
    } else if (code >= 90 && code <= 97) {
      // Bright foreground colors
      style.fg = ANSI_COLORS[code - 90 + 8];
    } else if (code >= 100 && code <= 107) {
      // Bright background colors
      style.bg = ANSI_COLORS[code - 100 + 8];
    }
    // Ignore unrecognized codes
    i++;
  }
}
// Match ANSI escape sequences: ESC[ followed by params and ending with 'm'
const ANSI_REGEX = /\x1b\[([\d;]*)m/g;
/**
 * Convert ANSI-escaped text to HTML with inline styles.
 */
export function ansiToHtml(text) {
  const style = createEmptyStyle();
  let result = "";
  let lastIndex = 0;
  let inSpan = false;
  // Reset regex state
  ANSI_REGEX.lastIndex = 0;
  let match = ANSI_REGEX.exec(text);
  while (match !== null) {
    // Add text before this escape sequence
    const beforeText = text.slice(lastIndex, match.index);
    if (beforeText) {
      result += escapeHtml(beforeText);
    }
    // Parse SGR parameters
    const paramStr = match[1];
    const params = paramStr
      ? paramStr.split(";").map((p) => parseInt(p, 10) || 0)
      : [0];
    // Close existing span if we have one
    if (inSpan) {
      result += "</span>";
      inSpan = false;
    }
    // Apply the codes
    applySgrCode(params, style);
    // Open new span if we have any styling
    if (hasStyle(style)) {
      result += `<span style="${styleToInlineCSS(style)}">`;
      inSpan = true;
    }
    lastIndex = match.index + match[0].length;
    match = ANSI_REGEX.exec(text);
  }
  // Add remaining text
  const remainingText = text.slice(lastIndex);
  if (remainingText) {
    result += escapeHtml(remainingText);
  }
  // Close any open span
  if (inSpan) {
    result += "</span>";
  }
  return result;
}
/**
 * Convert array of ANSI-escaped lines to HTML.
 * Each line is wrapped in a div element.
 */
export function ansiLinesToHtml(lines) {
  return lines
    .map(
      (line) => `<div class="ansi-line">${ansiToHtml(line) || "&nbsp;"}</div>`,
    )
    .join("\n");
}
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