#!/usr/bin/env python3
"""Самопроверка обвязки озвучки: python3 test_audiobook.py (нужен ffmpeg)"""
import json
import subprocess
import sys
import tempfile
from pathlib import Path

import audiobook as a


def mp3(path, seconds):
    """Тишина заданной длительности — реальный mp3 для ffprobe."""
    subprocess.run(
        ["ffmpeg", "-v", "error", "-y", "-f", "lavfi",
         "-i", "anullsrc=r=22050:cl=mono", "-t", str(seconds),
         "-b:a", "32k", str(path)],
        check=True)


def write_chapter(d, num, paragraphs):
    (d / ("chapter_%03d_translated.json" % num)).write_text(
        json.dumps({"number": num, "title": "Глава ⟦b⟧%d⟦/b⟧" % num,
                    "paragraphs": paragraphs}, ensure_ascii=False),
        encoding="utf-8")


def test_prep(tmp: Path):
    src, out = tmp / "translations", tmp / "tts"
    src.mkdir()
    write_chapter(src, 0, ["Он сказал ⟦i⟧привет⟧⟦/i⟧ громко.",
                           "Обычный  абзац.", "   "])
    ns = type("ns", (), {"translations": src, "output": out})
    a.cmd_prep(ns)
    data = json.loads((out / "chapter_000_translated.json").read_text(encoding="utf-8"))
    assert "⟦" not in json.dumps(data, ensure_ascii=False), "маркеры должны исчезнуть"
    assert data["title"] == "Глава 0"
    assert len(data["paragraphs"]) == 2, "пустой абзац должен отброситься"
    assert "  " not in data["paragraphs"][1], "двойные пробелы должны схлопнуться"


def test_verify_detects_gap(tmp: Path):
    tts, ab = tmp / "tts", tmp / "audiobook"
    tts.mkdir()
    temp = ab / "temp_audio"
    temp.mkdir(parents=True)

    # две главы по 4 абзаца одинаковой длины
    para = "х" * 100
    for n in (0, 1):
        write_chapter(tts, n, [para] * 4)
        mp3(temp / ("chapter_%03d_intro.mp3" % n), 1)
        # у главы 1 намеренно пропущен последний абзац
        count = 4 if n == 0 else 3
        for i in range(count):
            mp3(temp / ("chapter_%03d_para_%04d.mp3" % (n, i)), 6)

    ns = type("ns", (), {"translations": tts, "audiobook": ab})
    assert a.cmd_verify(ns) is False, "пропущенный фрагмент должен завалить проверку"


def test_verify_clean(tmp: Path):
    tts, ab = tmp / "tts", tmp / "audiobook"
    tts.mkdir()
    temp = ab / "temp_audio"
    temp.mkdir(parents=True)
    para = "х" * 100
    for n in (0, 1):
        write_chapter(tts, n, [para] * 3)
        mp3(temp / ("chapter_%03d_intro.mp3" % n), 1)
        for i in range(3):
            mp3(temp / ("chapter_%03d_para_%04d.mp3" % (n, i)), 6)
    ns = type("ns", (), {"translations": tts, "audiobook": ab})
    assert a.cmd_verify(ns) is True, "целая книга должна проходить проверку"


def test_verify_detects_empty_file(tmp: Path):
    tts, ab = tmp / "tts", tmp / "audiobook"
    tts.mkdir()
    temp = ab / "temp_audio"
    temp.mkdir(parents=True)
    para = "х" * 100
    write_chapter(tts, 0, [para] * 3)
    mp3(temp / "chapter_000_intro.mp3", 1)
    mp3(temp / "chapter_000_para_0000.mp3", 6)
    mp3(temp / "chapter_000_para_0001.mp3", 6)
    (temp / "chapter_000_para_0002.mp3").touch()  # нулевой размер
    ns = type("ns", (), {"translations": tts, "audiobook": ab})
    assert a.cmd_verify(ns) is False, "пустой файл должен завалить проверку"


def build_book(tmp: Path, chapters=2, paras=3):
    """Готовый синтез: подготовленные главы + фрагменты в temp_audio/."""
    tts, ab = tmp / "tts", tmp / "audiobook"
    tts.mkdir()
    temp = ab / "temp_audio"
    temp.mkdir(parents=True)
    for n in range(chapters):
        write_chapter(tts, n, ["х" * 100] * paras)
        mp3(temp / ("chapter_%03d_intro.mp3" % n), 1)
        for i in range(paras):
            mp3(temp / ("chapter_%03d_para_%04d.mp3" % (n, i)), 2)
    return tts, ab


def split_ns(tts, ab, out, **kw):
    fields = {"translations": tts, "audiobook": ab, "output": out,
              "album": "Книга", "author": "Автор", "gap": 0.3, "force": False}
    fields.update(kw)
    return type("ns", (), fields)


def test_split_makes_chapter_tracks(tmp: Path):
    tts, ab = build_book(tmp, chapters=2, paras=3)
    out = tmp / "tracks"
    assert a.cmd_split(split_ns(tts, ab, out)) is True
    tracks = sorted(out.glob("*.mp3"))
    assert len(tracks) == 2, "по треку на главу"
    assert tracks[0].name.startswith("000 - "), tracks[0].name
    assert not (out / ".tmp").exists(), "временный каталог должен убираться"

    # длительность: 1 вводный + 3 абзаца + 3 паузы = 1 + 6 + 0.9 ≈ 7.9 с
    d = a.duration(tracks[0])
    assert 7.0 < d < 9.0, d

    # теги проставлены
    r = subprocess.run(
        ["ffprobe", "-v", "error", "-show_entries",
         "format_tags=album,artist,track,title", "-of", "default=nw=1",
         str(tracks[0])], capture_output=True, text=True)
    assert "Книга" in r.stdout and "Автор" in r.stdout, r.stdout
    assert "track=1/2" in r.stdout, r.stdout


def test_split_skips_incomplete_chapter(tmp: Path):
    tts, ab = build_book(tmp, chapters=2, paras=3)
    (ab / "temp_audio" / "chapter_001_para_0002.mp3").unlink()
    out = tmp / "tracks"
    assert a.cmd_split(split_ns(tts, ab, out)) is False, "неполная глава должна пропускаться"
    assert len(list(out.glob("*.mp3"))) == 1, "целая глава всё равно нарезается"

    out2 = tmp / "forced"
    assert a.cmd_split(split_ns(tts, ab, out2, force=True)) is True
    assert len(list(out2.glob("*.mp3"))) == 2, "--force режет обе"


def test_split_without_gap(tmp: Path):
    tts, ab = build_book(tmp, chapters=1, paras=2)
    out = tmp / "tracks"
    assert a.cmd_split(split_ns(tts, ab, out, gap=0)) is True
    d = a.duration(next(out.glob("*.mp3")))
    assert 4.5 < d < 5.6, d  # 1 + 2 + 2 без пауз


if __name__ == "__main__":
    if subprocess.run(["which", "ffmpeg"], capture_output=True).returncode:
        sys.exit("нужен ffmpeg")
    for fn in (test_prep, test_verify_detects_gap, test_verify_clean,
               test_verify_detects_empty_file, test_split_makes_chapter_tracks,
               test_split_skips_incomplete_chapter, test_split_without_gap):
        with tempfile.TemporaryDirectory() as d:
            print("---", fn.__name__)
            fn(Path(d))
    print("OK")