from __future__ import annotations

import base64
import os
import shutil
import tempfile
import time
import uuid
from typing import Any

try:
    from .audio import ensure_wav, resolve_trim_options, round_sec, save_wav, seconds_from_samples, trim_audio
    from .config import VoiceRuntimeConfig
    from .diarization_component import apply_diarization, run_diarization_only
    from .inference import transcribe_with_metadata
except ImportError:  # HF flat-root execution fallback
    from audio import ensure_wav, resolve_trim_options, round_sec, save_wav, seconds_from_samples, trim_audio
    from config import VoiceRuntimeConfig
    from diarization_component import apply_diarization, run_diarization_only
    from inference import transcribe_with_metadata


def _word_confidence_label(probability: float | None) -> str:
    if probability is None:
        return "low"
    if probability >= 0.85:
        return "high"
    if probability >= 0.60:
        return "medium"
    return "low"


def _sec_to_sample(seconds: float, sample_rate: int) -> int:
    return int(round(max(0.0, seconds) * sample_rate))


def _build_alignment_payload(segments: list[Any], sample_rate: int) -> tuple[list[dict], list[dict], list[dict], str]:
    segment_payload: list[dict] = []
    sentence_payload: list[dict] = []
    word_payload: list[dict] = []

    for segment_idx, segment in enumerate(segments):
        seg_start = float(segment.start if segment.start is not None else 0.0)
        seg_end = float(segment.end if segment.end is not None else seg_start)
        seg_start_sample = _sec_to_sample(seg_start, sample_rate)
        seg_end_sample = max(seg_start_sample + 1, _sec_to_sample(seg_end, sample_rate))

        raw_words = getattr(segment, "words", None) or []
        for token in raw_words:
            token_text = (token.word or "").strip()
            if not token_text:
                continue

            word_start = float(token.start if token.start is not None else seg_start)
            word_end = float(token.end if token.end is not None else word_start)
            word_start_sample = _sec_to_sample(word_start, sample_rate)
            word_end_sample = max(word_start_sample + 1, _sec_to_sample(word_end, sample_rate))

            word_payload.append(
                {
                    "index": len(word_payload),
                    "sentence_index": segment_idx,
                    "segment_index": segment_idx,
                    "word": token_text,
                    "start_sample": word_start_sample,
                    "end_sample": word_end_sample,
                    "start_sec": round_sec(seconds_from_samples(word_start_sample, sample_rate)),
                    "end_sec": round_sec(seconds_from_samples(word_end_sample, sample_rate)),
                    "duration_sec": round_sec(seconds_from_samples(word_end_sample - word_start_sample, sample_rate)),
                    "confidence": _word_confidence_label(getattr(token, "probability", None)),
                }
            )

        text = (segment.text or "").strip()
        segment_payload.append(
            {
                "index": segment_idx,
                "text": text,
                "start_sample": seg_start_sample,
                "end_sample": seg_end_sample,
                "start_sec": round_sec(seconds_from_samples(seg_start_sample, sample_rate)),
                "end_sec": round_sec(seconds_from_samples(seg_end_sample, sample_rate)),
                "duration_sec": round_sec(seconds_from_samples(seg_end_sample - seg_start_sample, sample_rate)),
            }
        )

        sentence_payload.append(
            {
                "index": segment_idx,
                "text": text,
                "segment_indices": [segment_idx],
                "start_sample": seg_start_sample,
                "end_sample": seg_end_sample,
                "start_sec": round_sec(seconds_from_samples(seg_start_sample, sample_rate)),
                "end_sec": round_sec(seconds_from_samples(seg_end_sample, sample_rate)),
                "duration_sec": round_sec(seconds_from_samples(seg_end_sample - seg_start_sample, sample_rate)),
                "word_count": sum(1 for word in word_payload if word["segment_index"] == segment_idx),
            }
        )

    transcript_text = " ".join(item["text"] for item in segment_payload).strip()
    return segment_payload, sentence_payload, word_payload, transcript_text


def _build_transcript_entries(segments: list[dict], language: str) -> list[dict]:
    return [
        {
            "index": idx,
            "text": segment["text"],
            "start_sec": segment["start_sec"],
            "end_sec": segment["end_sec"],
            "duration_sec": segment["duration_sec"],
            "language": language,
        }
        for idx, segment in enumerate(segments)
    ]


def _build_alignment_meta(trim_silence_enabled: bool) -> dict[str, Any]:
    notes = [
        "Segment timestamps come from transcription provider native timing.",
        "Word timestamps come from transcription provider native timing.",
    ]
    if trim_silence_enabled:
        notes.append("Silence trimming was applied before transcription.")

    return {
        "word_timestamps": "model_native",
        "segment_timestamps": "model_native",
        "sentence_timestamps": "exact_from_segments",
        "timing_mode": "model_native",
        "model_native_word_timestamps": True,
        "silence_trimmed": bool(trim_silence_enabled),
        "notes": notes,
    }


def process_voice(
    input_audio_path: str,
    config: VoiceRuntimeConfig,
    language_hint: str,
    trim_silence_enabled: bool,
    include_audio_payload: bool,
    minimal_output: bool,
) -> dict[str, Any]:
    request_id = f"voice-{uuid.uuid4().hex}"

    wav_path, raw_audio = ensure_wav(input_audio_path, config.sample_rate)
    working_dir = tempfile.mkdtemp(prefix="voice-intel-run-")
    processed_wav_path = os.path.join(working_dir, "processed.wav")
    try:
        trim_options = resolve_trim_options(
            enabled=trim_silence_enabled,
            threshold_db=config.silence_threshold_db,
            min_silence_sec=config.min_silence_sec,
            keep_padding_sec=config.keep_padding_sec,
            analysis_window_ms=config.analysis_window_ms,
        )

        processed_audio, silence_processing, _ = trim_audio(
            audio=raw_audio,
            sample_rate=config.sample_rate,
            options=trim_options,
        )

        save_wav(processed_audio, processed_wav_path, config.sample_rate)

        whisper_segments, language, language_source, transcription_meta = transcribe_with_metadata(
            wav_path=processed_wav_path,
            config=config,
            language_hint=language_hint,
        )

        segments, sentences, words, transcript_text = _build_alignment_payload(
            segments=whisper_segments,
            sample_rate=config.sample_rate,
        )

        diarization_segments, diarization_summary = apply_diarization(
            wav_path=processed_wav_path,
            config=config,
            sample_rate=config.sample_rate,
            segments=segments,
            words=words,
        )
        transcript = _build_transcript_entries(segments, language)
        alignment_meta = _build_alignment_meta(trim_silence_enabled=trim_silence_enabled)

        response: dict[str, Any] = {
            "id": request_id,
            "object": "audio.voice_intelligence",
            "created": int(time.time()),
            "module": "voice-intelligence",
            "mode": "trimmed" if trim_silence_enabled else "raw",
            "model": config.groq_model_id,
            "runtime_model": config.groq_model_id,
            "transcription_provider": "groq",
            "language": language,
            "voice_language": language,
            "language_source": language_source,
            "sample_rate": config.sample_rate,
            "format": "wav",
            "char_count": len(transcript_text),
            "duration_sec": round_sec(seconds_from_samples(len(processed_audio), config.sample_rate)),
            "raw_duration_sec": round_sec(seconds_from_samples(len(raw_audio), config.sample_rate)),
            "word_count": len(words),
            "segment_count": len(segments),
            "sentence_count": len(sentences),
            "transcript_text": transcript_text,
            "segments": segments,
            "sentences": sentences,
            "words": words,
            "transcript": transcript,
            "alignment": alignment_meta,
            "transcription": transcription_meta,
            "silence_processing": silence_processing,
            "diarization": {
                "enabled": bool(config.diarization_enabled),
                "model": config.diarization_model_id,
                "segments": diarization_segments,
                "summary": diarization_summary,
            },
        }

        if minimal_output:
            response = {
                "id": request_id,
                "object": "audio.voice_intelligence.raw",
                "created": int(time.time()),
                "module": "voice-intelligence",
                "mode": "raw",
                "language": language,
                "voice_language": language,
                "sample_rate": config.sample_rate,
                "format": "wav",
                "model": config.groq_model_id,
                "transcription_provider": "groq",
                "duration_sec": round_sec(seconds_from_samples(len(raw_audio), config.sample_rate)),
                "raw_duration_sec": round_sec(seconds_from_samples(len(raw_audio), config.sample_rate)),
                "char_count": len(transcript_text),
                "word_count": len(words),
                "segment_count": len(segments),
                "transcript_text": transcript_text,
                "segments": segments,
                "words": words,
                "transcription": transcription_meta,
                "diarization": {
                    "enabled": bool(config.diarization_enabled),
                    "model": config.diarization_model_id,
                    "segments": diarization_segments,
                    "summary": diarization_summary,
                },
            }

        if include_audio_payload:
            with open(processed_wav_path, "rb") as wav_file:
                audio_bytes = wav_file.read()
            response["audio"] = {
                "format": "wav",
                "base64": base64.b64encode(audio_bytes).decode("ascii"),
                "filename": f"{request_id}.wav",
            }

        return response
    finally:
        try:
            os.remove(processed_wav_path)
        except OSError:
            pass

        try:
            shutil.rmtree(working_dir, ignore_errors=True)
        except OSError:
            pass

        try:
            source_tmp_dir = os.path.dirname(wav_path)
            shutil.rmtree(source_tmp_dir, ignore_errors=True)
        except OSError:
            pass


def process_diarization_only(
    input_audio_path: str,
    config: VoiceRuntimeConfig,
) -> dict[str, Any]:
    request_id = f"voice-{uuid.uuid4().hex}"

    wav_path, raw_audio = ensure_wav(input_audio_path, config.sample_rate)
    try:
        diarization_segments, diarization_summary = run_diarization_only(
            wav_path=wav_path,
            config=config,
            sample_rate=config.sample_rate,
        )

        return {
            "id": request_id,
            "object": "audio.voice_intelligence.diarization",
            "created": int(time.time()),
            "module": "voice-intelligence",
            "mode": "diarization",
            "sample_rate": config.sample_rate,
            "format": "wav",
            "duration_sec": round_sec(seconds_from_samples(len(raw_audio), config.sample_rate)),
            "raw_duration_sec": round_sec(seconds_from_samples(len(raw_audio), config.sample_rate)),
            "diarization": {
                "enabled": bool(config.diarization_enabled),
                "model": config.diarization_model_id,
                "segments": diarization_segments,
                "summary": diarization_summary,
            },
        }
    finally:
        try:
            source_tmp_dir = os.path.dirname(wav_path)
            shutil.rmtree(source_tmp_dir, ignore_errors=True)
        except OSError:
            pass