"""Tests for the PUT /api/settings handler with the flat
chatterbox / qwentts save shape.

v0.5.24 (Fix B1): the dashboard's `gatherSettingsPatch()` now
sends the chatterbox + qwentts knobs as flat siblings of
`engine` / `voice` (matching the backend's `TTSSettings`
schema) instead of nested under `tts.chatterbox: {...}` and
`tts.qwentts: {...}` sub-dicts. The previous nested shape
was silently dropped by Pydantic with default
`extra="ignore"` — the user's chatterbox_ref_audio
selection (and all the other chatterbox + qwentts knobs)
were never persisted.

These tests pin the wire contract: a flat payload is
accepted and round-trips through `Settings.model_dump`
with the chatterbox_*/qwentts_* fields intact, while a
nested payload (the old, broken shape) is also accepted
(by `Settings.model_validate`, which ignores the
unknown nested keys) but DOES NOT populate the flat
fields. The dashboard only sends flat; the nested-shape
test guards against the saved-on-disk config from an
older build causing a regression.
"""

from __future__ import annotations

import os
import sys
import tempfile
from pathlib import Path

import pytest


_tmp_config = tempfile.mkdtemp(prefix="reachy-settings-test-")
os.environ["REACHY_CONV_APP_CONFIG"] = os.path.join(_tmp_config, "config.yaml")

# Make `src/reachy_conv_app` importable.
_REPO = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
_SRC = os.path.join(_REPO, "src")
if _SRC not in sys.path:
    sys.path.insert(0, _SRC)

from reachy_conv_app.dashboard import server as dash_server  # noqa: E402
from reachy_conv_app.local_settings import (  # noqa: E402
    Settings,
    TTSSettings,
    load_settings,
    save_settings,
)


@pytest.fixture(autouse=True)
def _isolated_config(tmp_path, monkeypatch):
    """Point the settings file at a tmp dir for each test.

    Returns the Path to the config.yaml the test should
    write to (autouse; the test only needs to use it if it
    wants to pre-populate the file)."""
    p = tmp_path / "config.yaml"
    monkeypatch.setenv("REACHY_CONV_APP_CONFIG", str(p))
    return p


@pytest.fixture
def client():
    """A FastAPI TestClient with the app_state reset."""
    from fastapi.testclient import TestClient
    saved_handler = dash_server.app_state.handler
    dash_server.app_state.handler = None
    app = dash_server.create_app()
    with TestClient(app) as c:
        yield c
    dash_server.app_state.handler = saved_handler


# --- Fix B1: flat chatterbox payload round-trips --------------------------

def test_put_settings_accepts_flat_chatterbox_payload(client):
    """The dashboard now sends the chatterbox knobs as flat
    siblings of `engine`. The PUT /api/settings handler must
    accept the flat shape and persist chatterbox_ref_audio
    to disk so the user's cloned-voice selection survives a
    page reload.

    Bug this guards against: the old nested payload
    `tts.chatterbox: {ref_audio: "..."}` was silently
    dropped by Pydantic with default extra="ignore", so
    the saved config had chatterbox_ref_audio="" no
    matter what the user selected in the dashboard.
    """
    payload = {
        "tts": {
            "engine": "chatterbox",
            "voice": "en-US-AriaNeural",
            "chatterbox_model": "chatterbox-turbo",
            "chatterbox_device": "cpu",
            "chatterbox_exaggeration": 0.7,
            "chatterbox_cfg_weight": 0.5,
            "chatterbox_ref_audio": "/home/user/.cache/voices/my-voice/source.wav",
        },
    }
    r = client.put("/api/settings", json=payload)
    assert r.status_code == 200, r.text
    body = r.json()
    assert body["tts"]["engine"] == "chatterbox"
    # The flat chatterbox_ref_audio field MUST be persisted.
    # (This was the bug — previously the nested sub-tree was
    # silently dropped.)
    assert body["tts"]["chatterbox_ref_audio"] == (
        "/home/user/.cache/voices/my-voice/source.wav"
    )
    assert body["tts"]["chatterbox_model"] == "chatterbox-turbo"
    assert body["tts"]["chatterbox_exaggeration"] == 0.7


def test_put_settings_persists_flat_chatterbox_to_disk(client, _isolated_config):
    """Beyond the response, the flat chatterbox_ref_audio
    must actually be written to the on-disk config.yaml so
    it survives a restart. This is what the user's
    'pick a cloned voice, save, restart, voice is still
    picked' flow depends on."""
    payload = {
        "tts": {
            "engine": "chatterbox",
            "chatterbox_ref_audio": "/home/user/.cache/voices/my-voice/source.wav",
        },
    }
    r = client.put("/api/settings", json=payload)
    assert r.status_code == 200
    # Reload from disk to confirm the file was actually written
    # with the flat field (not dropped on save).
    s = load_settings()
    assert s.tts.engine == "chatterbox"
    assert s.tts.chatterbox_ref_audio == (
        "/home/user/.cache/voices/my-voice/source.wav"
    )


# --- The OLD nested shape is dropped (regression guard) -------------------

def test_put_settings_nested_chatterbox_subtree_is_dropped(client, _isolated_config):
    """v0.5.24 changed the dashboard to flat. But a config.yaml
    written by an older build would still have the nested
    `chatterbox: {ref_audio: "..."}` sub-tree at the tts
    level. Pydantic with default extra="ignore" drops the
    nested sub-tree on Settings.model_validate — the
    flat chatterbox_ref_audio field stays at its default
    (empty string).

    This test pins that behaviour so a future refactor of
    the Settings model doesn't accidentally start honouring
    the old nested shape (which would be a real wire-
    format change and would need its own migration).
    """
    # Write a config file that mimics the OLD nested shape
    # directly to disk, then PUT a partial update on top.
    # The Settings.model_validate step inside the PUT
    # handler must drop the nested chatterbox sub-tree.
    import yaml
    raw = {
        "tts": {
            "engine": "chatterbox",
            "chatterbox": {  # OLD nested shape
                "ref_audio": "/path/from/old/nested/voice.wav",
                "model": "chatterbox-multilingual",
            },
        },
    }
    _isolated_config.write_text(yaml.safe_dump(raw), encoding="utf-8")
    # Now PUT a partial update with a flat chatterbox_ref_audio.
    r = client.put("/api/settings", json={
        "tts": {"chatterbox_ref_audio": "/new/flat/value.wav"},
    })
    assert r.status_code == 200
    body = r.json()
    # The flat field was set; the old nested chatterbox sub-tree
    # is dropped by Pydantic, so the OTHER chatterbox_* fields
    # are at their TTSSettings defaults (not the old nested values).
    assert body["tts"]["chatterbox_ref_audio"] == "/new/flat/value.wav"
    assert body["tts"]["chatterbox_model"] == "chatterbox-turbo"  # default, not old nested
    # The nested key itself shouldn't be in the response
    # (model_dump doesn't emit it; it was ignored on validate).
    assert "chatterbox" not in body["tts"]


# --- Flat qwentts payload also round-trips --------------------------------

def test_put_settings_accepts_flat_qwentts_payload(client):
    """Same shape mismatch existed for qwentts. The dashboard
    now sends flat qwentts_* fields. The handler must accept
    them and persist.

    qwentts is dormant in this build (see tts/manager.py:208-227
    and tts/__init__.py:14) — the runtime doesn't read these
    fields — but the wire shape still has to match the on-disk
    schema for consistency and for the day qwentts is
    re-enabled.
    """
    payload = {
        "tts": {
            "engine": "edge",  # any non-qwentts; the qwentts_* fields are still persisted
            "qwentts_binary_path": "",
            "qwentts_model_size": "0.6B",
            "qwentts_language": "english",
            "qwentts_voice_mode": "preset",
            "qwentts_voice_style": "speak like a teenage girl",
            "qwentts_advanced": {
                "seed": 42,
                "max_new_tokens": 1024,
                "top_k": 50,
                "temperature": 0.9,
                "top_p": 1.0,
                "repetition_penalty": 1.05,
                "do_sample": True,
            },
        },
    }
    r = client.put("/api/settings", json=payload)
    assert r.status_code == 200, r.text
    body = r.json()
    # The flat qwentts_* fields are persisted.
    assert body["tts"]["qwentts_model_size"] == "0.6B"
    assert body["tts"]["qwentts_voice_mode"] == "preset"
    assert body["tts"]["qwentts_voice_style"] == "speak like a teenage girl"
    # The advanced sub-dict (AdvancedQwenttsSettings) IS a
    # sub-model on the backend, so it round-trips as a dict.
    assert body["tts"]["qwentts_advanced"]["seed"] == 42
    assert body["tts"]["qwentts_advanced"]["temperature"] == 0.9


# --- Field validation: invalid chatterbox_model is rejected -------------

def test_put_settings_rejects_invalid_chatterbox_model(client):
    """chatterbox_model is a Literal["chatterbox", "chatterbox-turbo",
    "chatterbox-multilingual"]; an unknown value is a 400."""
    payload = {
        "tts": {
            "chatterbox_model": "chatterbox-fake",  # not a known variant
        },
    }
    r = client.put("/api/settings", json=payload)
    assert r.status_code == 400
    assert "chatterbox_model" in r.json()["detail"] or "chatterbox" in r.json()["detail"]


# --- Defaults are unchanged when the chatterbox sub-tree is absent -------

def test_put_settings_preserves_chatterbox_defaults_when_not_sent(client):
    """When the dashboard sends a partial patch that doesn't
    include any chatterbox_* fields, the existing values
    are preserved (the handler deep-merges). This is the
    'edit voice, save, chatterbox settings intact' flow."""
    # Set up: pre-populate with non-default chatterbox values.
    s = load_settings()
    s.tts.chatterbox_exaggeration = 1.2
    s.tts.chatterbox_ref_audio = "/pre/existing/voice.wav"
    save_settings(s)
    # Edit: send a patch that only changes the LLM timeout.
    payload = {
        "llm": {"timeout_s": 123.0},
    }
    r = client.put("/api/settings", json=payload)
    assert r.status_code == 200
    body = r.json()
    # The chatterbox fields are unchanged.
    assert body["tts"]["chatterbox_exaggeration"] == 1.2
    assert body["tts"]["chatterbox_ref_audio"] == "/pre/existing/voice.wav"
    # And the LLM change took effect.
    assert body["llm"]["timeout_s"] == 123.0