"""
Diarize all training episodes, saving diarization.json next to each transcript.
Then rebuild the archive DB with proper HOST/CALLER labels.
"""

import sys
import os

# Force UTF-8 output on Windows so Rich's Braille spinner characters don't crash
os.environ["PYTHONIOENCODING"] = "utf-8"
if hasattr(sys.stdout, "reconfigure"):
    sys.stdout.reconfigure(encoding="utf-8")
if hasattr(sys.stderr, "reconfigure"):
    sys.stderr.reconfigure(encoding="utf-8")

# Prevent transformers from checking HuggingFace for model updates on every
# from_pretrained() call — models are already cached locally.
os.environ["TRANSFORMERS_OFFLINE"] = "1"

from pathlib import Path

# Ensure CUDA libs before any torch imports
from src.gpu import ensure_cuda_libs
ensure_cuda_libs()

from src.config import load_config
from src.diarizer import diarize, VoiceProfileStore
from src.indexer import ArchiveIndex
from src.qa_extractor import load_diarized_transcript, extract_qa_pairs, tag_qa_pairs_with_ollama
from rich.console import Console

console = Console()

BASE = Path(__file__).parent
EPISODES_DIR = BASE / "training-data" / "episodes"
TRANSCRIPTS_DIR = BASE / "training-data" / "transcripts"
DB_PATH = BASE / "archive" / "archive.db"

config = load_config()

# Load voice profiles
voice_profiles = VoiceProfileStore(
    config.resolve_path(config.diarization.voice_profiles_dir)
)

episodes = sorted(EPISODES_DIR.glob("*.mp3"))
console.print(f"[bold]Diarizing {len(episodes)} training episodes[/bold]")

# ── Step 1: Diarize ───────────────────────────────────────────────────────────
for i, ep_path in enumerate(episodes, 1):
    stem = ep_path.stem
    transcript_dir = TRANSCRIPTS_DIR / stem
    if not transcript_dir.exists():
        console.print(f"[{i}/{len(episodes)}] [yellow]No transcript dir: {stem} — skipping[/yellow]")
        continue

    diarization_out = transcript_dir / "diarization.json"
    if diarization_out.exists():
        console.print(f"[{i}/{len(episodes)}] [dim]Already diarized: {stem}[/dim]")
        continue

    console.print(f"\n[{i}/{len(episodes)}] Diarizing: {stem}")
    try:
        result = diarize(ep_path, voice_profiles=voice_profiles,
                         min_speakers=config.diarization.min_speakers,
                         max_speakers=config.diarization.max_speakers,
                         host_match_threshold=0.85)
        result.save(transcript_dir)
        speakers = result.speakers_ranked()
        console.print(f"  Done — {len(result.turns)} turns | top speakers: "
                      + ", ".join(f"{s} ({t:.0f}s)" for s, t in speakers[:3]))
    except Exception as e:
        console.print(f"  [red]FAILED: {e}[/red]")
        import traceback; traceback.print_exc()

# ── Step 2: Rebuild DB ────────────────────────────────────────────────────────
console.print("\n[bold]Rebuilding archive DB with diarization...[/bold]")

if DB_PATH.exists():
    DB_PATH.unlink()
    console.print("[dim]Cleared existing DB[/dim]")

import re, json

def episode_id(stem):
    return re.sub(r"-hr\d$", "", stem, flags=re.IGNORECASE)

with ArchiveIndex(DB_PATH) as idx:
    for ep_path in episodes:
        stem = ep_path.stem
        transcript_dir = TRANSCRIPTS_DIR / stem
        transcript_path = transcript_dir / "transcript.json"
        diarization_path = transcript_dir / "diarization.json"

        if not transcript_path.exists():
            console.print(f"[yellow]No transcript: {stem} — skipping[/yellow]")
            continue

        ep_id = episode_id(stem)
        date_m = re.search(r"(\d{4}-\d{2}-\d{2})", stem)
        date = date_m.group(1) if date_m else None

        with open(transcript_path) as f:
            td = json.load(f)
        duration = td.get("duration")

        segments = load_diarized_transcript(
            transcript_path,
            diarization_path if diarization_path.exists() else None
        )

        idx.add_episode(ep_id, ep_path, date=date, duration=duration)
        idx.add_segments(ep_id, segments)

        # Speaker breakdown
        host_segs = sum(1 for s in segments if s["speaker"] == "HOST")
        caller_segs = sum(1 for s in segments if s["speaker"] in ("CALLER", "UNKNOWN"))
        console.print(f"  {ep_id}: {len(segments)} segs "
                      f"(HOST={host_segs}, other={caller_segs})")

        # Extract Q&A pairs
        pairs = extract_qa_pairs(segments)
        console.print(f"    {len(pairs)} Q&A pairs", end="")

        if pairs:
            console.print(f" — tagging with Ollama...", end="")
            pairs = tag_qa_pairs_with_ollama(
                pairs, ollama_host=config.llm.ollama_host, model=config.llm.model
            )

        for pair in pairs:
            idx.add_qa_pair(
                ep_id,
                pair.question_start, pair.question_end,
                pair.answer_start, pair.answer_end,
                pair.question_text, pair.answer_text,
                topic=pair.topic, tags=pair.topic_tags,
            )

        console.print()

    stats = idx.stats()

console.print(f"\n[bold green]Done.[/bold green] "
              f"{stats['episodes']} episodes | "
              f"{stats['segments']} segments | "
              f"{stats['qa_pairs']} Q&A pairs")
console.print(f"DB: {DB_PATH}")