"""Integration tests for scripts/compose.py — end-to-end compose workflow."""

import sys
from pathlib import Path
from unittest.mock import patch, MagicMock

sys.path.insert(0, str(Path(__file__).parents[1]))

import pytest
from src.core.schema import SongDefinition, SongMeta, TrackDef, ClipDef, MidiNote
from src.reaper_builder import RPPBuilder


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def compose_via_builder(
    genre: str = "reggaeton",
    bpm: float = 95.0,
    key: str = "Am",
    output_path: str = "output/track.rpp",
) -> SongDefinition:
    """Build a SongDefinition the same way scripts/compose.py does, return it.

    This lets us test the compose logic without hitting the filesystem for samples.
    """
    from src.composer.rhythm import get_notes
    from src.composer.melodic import bass_tresillo, lead_hook, chords_block, pad_sustain
    from src.composer.converters import rhythm_to_midi, melodic_to_midi

    genre_bar_map = {"reggaeton": 64, "trap": 32, "house": 64, "drill": 32}
    bar_count = genre_bar_map.get(genre.lower(), 48)

    # Drum tracks
    drum_tracks = []
    for role, generator_name in [
        ("kick",  "kick_main_notes"),
        ("snare", "snare_verse_notes"),
        ("hihat", "hihat_16th_notes"),
        ("perc",  "perc_combo_notes"),
    ]:
        note_dict = get_notes(generator_name, bar_count)
        midi_notes = rhythm_to_midi(note_dict)
        clip = ClipDef(
            position=0.0,
            length=bar_count * 4.0,
            name=f"{role.capitalize()} Pattern",
            midi_notes=midi_notes,
        )
        drum_tracks.append(TrackDef(name=role.capitalize(), clips=[clip]))

    # Melodic tracks (no selector — audio_path stays None)
    for role, generator_fn in [
        ("bass",   bass_tresillo),
        ("lead",   lead_hook),
        ("chords", chords_block),
        ("pad",    pad_sustain),
    ]:
        note_list = generator_fn(key=key, bars=bar_count)
        midi_notes = melodic_to_midi(note_list)
        clip = ClipDef(
            position=0.0,
            length=bar_count * 4.0,
            name=f"{role.capitalize()} MIDI",
            midi_notes=midi_notes,
        )
        drum_tracks.append(TrackDef(name=role.capitalize(), clips=[clip]))

    meta = SongMeta(bpm=bpm, key=key, title=f"{genre.capitalize()} Track")
    return SongDefinition(meta=meta, tracks=drum_tracks)


# ---------------------------------------------------------------------------
# Tests
# ---------------------------------------------------------------------------

class TestComposeRppOutput:
    """Tests for compose workflow producing valid .rpp output."""

    def test_compose_produces_rpp_file(self, tmp_path):
        """main() with valid args produces a .rpp file at the output path."""
        output = tmp_path / "track.rpp"

        # Mock SampleSelector.select_one so we don't need actual sample files
        with patch("scripts.compose.SampleSelector") as mock_selector_cls:
            mock_selector = MagicMock()
            mock_selector.select_one.return_value = None  # audio_path stays None
            mock_selector_cls.return_value = mock_selector

            from scripts.compose import main
            import sys
            original_argv = sys.argv
            try:
                sys.argv = [
                    "compose",
                    "--genre", "reggaeton",
                    "--bpm", "95",
                    "--key", "Am",
                    "--output", str(output),
                ]
                main()
            finally:
                sys.argv = original_argv

        assert output.exists(), f"Expected {output} to exist"

    def test_compose_rpp_has_min_4_tracks(self, tmp_path):
        """The .rpp output contains at least 4 <TRACK blocks."""
        output = tmp_path / "track.rpp"

        with patch("scripts.compose.SampleSelector") as mock_selector_cls:
            mock_selector = MagicMock()
            mock_selector.select_one.return_value = None
            mock_selector_cls.return_value = mock_selector

            from scripts.compose import main
            import sys
            original_argv = sys.argv
            try:
                sys.argv = [
                    "compose",
                    "--genre", "reggaeton",
                    "--bpm", "95",
                    "--key", "Am",
                    "--output", str(output),
                ]
                main()
            finally:
                sys.argv = original_argv

        content = output.read_text(encoding="utf-8")
        track_count = content.count("<TRACK")
        assert track_count >= 4, f"Expected >= 4 tracks, got {track_count}"

    def test_compose_invalid_bpm_raises(self):
        """main() with bpm=0 raises ValueError."""
        from scripts.compose import main
        import sys
        original_argv = sys.argv
        try:
            sys.argv = [
                "compose",
                "--genre", "reggaeton",
                "--bpm", "0",
                "--key", "Am",
                "--output", "output/track.rpp",
            ]
            with pytest.raises(ValueError, match="bpm must be > 0"):
                main()
        finally:
            sys.argv = original_argv

    def test_compose_negative_bpm_raises(self):
        """main() with bpm=-10 raises ValueError."""
        from scripts.compose import main
        import sys
        original_argv = sys.argv
        try:
            sys.argv = [
                "compose",
                "--genre", "reggaeton",
                "--bpm", "-10",
                "--key", "Am",
                "--output", "output/track.rpp",
            ]
            with pytest.raises(ValueError, match="bpm must be > 0"):
                main()
        finally:
            sys.argv = original_argv