// Reading a community theme's actual shipped format.
//
// Omarchy's own 22 themes carry a `colors.toml` in the semantic shape `palette.ts` expects — three
// background depths, four foreground weights, an accent, a selection, a muted. A community theme on
// omarchythemes.com ships none of that: it's per-app config files in the classic 16-ANSI-slot style,
// because that's what predates Omarchy 4's own format and what most single-theme repos still use.
//
// This file reads the two shapes that cover almost every repo: `alacritty.toml` (structured, typed,
// preferred) and `ghostty.conf`/`ghostty-theme` (flat `key = value` lines, fallback). Either becomes an
// `AnsiSource` — the 16 ANSI slots plus primary background/foreground — which `from-ansi.ts` turns into
// the same `Palette` shape the official pipeline consumes, so every downstream guarantee (contrast
// checking, the 84-token mapping) applies unchanged.

export type AnsiSource = {
  background: string;
  foreground: string;
  black: string;
  red: string;
  green: string;
  yellow: string;
  blue: string;
  magenta: string;
  cyan: string;
  white: string;
  brightBlack: string;
  brightRed: string;
  brightGreen: string;
  brightYellow: string;
  brightBlue: string;
  brightMagenta: string;
  brightCyan: string;
  brightWhite: string;
};

const HEX = /#[0-9a-fA-F]{3,8}/;

function normalizeHex(v: string): string | undefined {
  const m = v.match(HEX);
  if (!m) return undefined;
  let h = m[0].slice(1).toLowerCase();
  if (h.length === 3)
    h = h
      .split('')
      .map((c) => c + c)
      .join('');
  if (h.length >= 6) h = h.slice(0, 6);
  return `#${h}`;
}

/** A deliberately small TOML reader: flat `key = "value"` lines plus `[section]` headers. */
export function parseAlacrittyToml(text: string): AnsiSource | undefined {
  let section = '';
  const rows: Record<string, Record<string, string>> = {};
  for (const rawLine of text.split('\n')) {
    const line = rawLine.trim();
    const sectionMatch = line.match(/^\[([\w.]+)]$/);
    if (sectionMatch) {
      section = sectionMatch[1]!;
      rows[section] ??= {};
      continue;
    }
    // Quoted specifically, not "anything but a comment" — a hex value starts with `#`, the same
    // character that opens a trailing comment, so the two can only be told apart by the quotes.
    const kv = line.match(/^([\w-]+)\s*=\s*(['"])(.*?)\2/);
    if (kv && section) {
      const hex = normalizeHex(kv[3]!);
      if (hex) rows[section]![kv[1]!] = hex;
    }
  }

  const primary = rows['colors.primary'];
  const normal = rows['colors.normal'];
  const bright = rows['colors.bright'];
  if (!primary?.background || !primary?.foreground || !normal || !bright) return undefined;

  const need = (r: Record<string, string>, k: string): string | undefined => r[k];
  const n = (k: string) => need(normal, k);
  const b = (k: string) => need(bright, k);
  if (
    !n('black') ||
    !n('red') ||
    !n('green') ||
    !n('yellow') ||
    !n('blue') ||
    !n('magenta') ||
    !n('cyan') ||
    !n('white')
  )
    return undefined;
  if (
    !b('black') ||
    !b('red') ||
    !b('green') ||
    !b('yellow') ||
    !b('blue') ||
    !b('magenta') ||
    !b('cyan') ||
    !b('white')
  )
    return undefined;

  return {
    background: primary.background,
    foreground: primary.foreground,
    black: n('black')!,
    red: n('red')!,
    green: n('green')!,
    yellow: n('yellow')!,
    blue: n('blue')!,
    magenta: n('magenta')!,
    cyan: n('cyan')!,
    white: n('white')!,
    brightBlack: b('black')!,
    brightRed: b('red')!,
    brightGreen: b('green')!,
    brightYellow: b('yellow')!,
    brightBlue: b('blue')!,
    brightMagenta: b('magenta')!,
    brightCyan: b('cyan')!,
    brightWhite: b('white')!,
  };
}

/** Ghostty's config: flat `key = value`, ANSI palette as sixteen `palette = N=#hex` lines. */
export function parseGhosttyConf(text: string): AnsiSource | undefined {
  let background: string | undefined;
  let foreground: string | undefined;
  const palette: Record<number, string> = {};

  for (const rawLine of text.split('\n')) {
    const line = rawLine.trim();
    if (line.startsWith('#')) continue;
    const bg = line.match(/^background\s*=\s*(#[0-9a-fA-F]{3,8})/);
    if (bg) background = normalizeHex(bg[1]!);
    const fg = line.match(/^foreground\s*=\s*(#[0-9a-fA-F]{3,8})/);
    if (fg) foreground = normalizeHex(fg[1]!);
    const pal = line.match(/^palette\s*=\s*(\d+)\s*=\s*(#[0-9a-fA-F]{3,8})/);
    if (pal) {
      const hex = normalizeHex(pal[2]!);
      if (hex) palette[Number(pal[1])] = hex;
    }
  }

  if (!background || !foreground) return undefined;
  for (let i = 0; i <= 15; i++) if (!palette[i]) return undefined;

  return {
    background,
    foreground,
    black: palette[0]!,
    red: palette[1]!,
    green: palette[2]!,
    yellow: palette[3]!,
    blue: palette[4]!,
    magenta: palette[5]!,
    cyan: palette[6]!,
    white: palette[7]!,
    brightBlack: palette[8]!,
    brightRed: palette[9]!,
    brightGreen: palette[10]!,
    brightYellow: palette[11]!,
    brightBlue: palette[12]!,
    brightMagenta: palette[13]!,
    brightCyan: palette[14]!,
    brightWhite: palette[15]!,
  };
}