import type { SpeakerTurn } from "./types";

const SPEAKER_LINE = /^((?:Speaker\s+\d+)(?:\s*\([^)]+\))?|[A-Za-z][^:]{0,40}):\s*(.+)$/;

export function parseSpeakerTurns(transcript: string): SpeakerTurn[] {
  const turns: SpeakerTurn[] = [];

  for (const line of transcript.split("\n")) {
    const trimmed = line.trim();
    if (!trimmed) continue;

    const match = trimmed.match(SPEAKER_LINE);
    if (match) {
      turns.push({ speaker: match[1].trim(), text: match[2].trim() });
    } else if (turns.length > 0) {
      turns[turns.length - 1].text += ` ${trimmed}`;
    } else {
      turns.push({ speaker: "Speaker 1", text: trimmed });
    }
  }

  return turns;
}

export function getUniqueSpeakers(turns: SpeakerTurn[]): string[] {
  const seen = new Set<string>();
  const speakers: string[] = [];
  for (const turn of turns) {
    if (!seen.has(turn.speaker)) {
      seen.add(turn.speaker);
      speakers.push(turn.speaker);
    }
  }
  return speakers;
}

export const SPEAKER_COLORS = [
  "text-indigo-400",
  "text-emerald-400",
  "text-amber-400",
  "text-pink-400",
  "text-cyan-400",
  "text-violet-400",
];

export const SPEAKER_BG_COLORS = [
  "bg-indigo-500/10 border-indigo-500/20",
  "bg-emerald-500/10 border-emerald-500/20",
  "bg-amber-500/10 border-amber-500/20",
  "bg-pink-500/10 border-pink-500/20",
  "bg-cyan-500/10 border-cyan-500/20",
  "bg-violet-500/10 border-violet-500/20",
];

export function speakerColorIndex(speaker: string, speakers: string[]): number {
  const idx = speakers.indexOf(speaker);
  return idx >= 0 ? idx % SPEAKER_COLORS.length : 0;
}