# tests/test_synthesizer.py
import json
import pytest
from pathlib import Path
from voice_gen.synthesizer import synthesize, _build_cmd
from voice_gen.errors import MmxError


def test_build_cmd_minimum():
    cmd = _build_cmd(
        text="hi",
        voice_id=123,
        out_path=Path("out.mp3"),
        format="mp3",
    )
    assert cmd[:5] == ["mmx", "speech", "synthesize", "--non-interactive", "--quiet"]
    assert "--text" in cmd and "hi" in cmd
    assert "--voice" in cmd and "123" in cmd
    assert "--out" in cmd and "out.mp3" in cmd
    assert "--format" in cmd and "mp3" in cmd


def test_synthesize_invokes_mmx_and_returns_path(tmp_path):
    captured = {}

    def fake_run(cmd, **kwargs):
        captured["cmd"] = cmd
        captured["kwargs"] = kwargs
        out = Path(cmd[cmd.index("--out") + 1])
        out.parent.mkdir(parents=True, exist_ok=True)
        out.write_bytes(b"fake-audio")
        return type("R", (), {"returncode": 0, "stderr": ""})()

    out = synthesize(
        text="hello",
        voice_id=999,
        out_path=tmp_path / "x.mp3",
        format="mp3",
        run=fake_run,
    )
    assert out == tmp_path / "x.mp3"
    assert out.exists()
    assert captured["cmd"][2] == "synthesize"
    assert "--voice" in captured["cmd"]
    assert captured["cmd"][captured["cmd"].index("--voice") + 1] == "999"


def test_synthesize_raises_mmxerror_on_nonzero(tmp_path):
    def fake_run(cmd, **kwargs):
        return type("R", (), {"returncode": 3, "stderr": "auth failed"})()

    with pytest.raises(MmxError) as exc:
        synthesize(
            text="x",
            voice_id=1,
            out_path=tmp_path / "x.mp3",
            format="mp3",
            run=fake_run,
        )
    assert exc.value.exit_code == 3
    assert "auth failed" in str(exc.value)