"""
Typed configuration models for the Voice Assistant.

Purpose:
    Define and validate the configuration structures used by the
    application and dynamic provider loading system.

Responsibilities:
    - Define the application configuration for STT, Agent, and TTS.
    - Define the provider catalog structure.
    - Represent provider-specific options without coupling the core
      configuration model to a specific vendor or implementation.
    - Describe provider capabilities for discovery and future tooling.

Non-responsibilities:
    - Loading YAML files.
    - Reading environment variables or secrets.
    - Selecting or instantiating provider implementations.
    - Executing STT, Agent, or TTS functionality.

Architecture:
    YAML
      |
      v
    Config Loader
      |
      v
    AppConfig / ProviderCatalog
      |
      v
    Provider Loader
      |
      v
    STTAdapter / AgentAdapter / TTSAdapter
"""

import pytest
import yaml

from voice_assistant.config.loader import (
    load_config,
    load_provider_catalog,
)


def test_load_development_config():
    config = load_config()

    assert config.stt.provider == "nvidia"
    assert config.stt.options["server"] == "127.0.0.1:9000"
    assert config.stt.options["language_code"] == "pt-BR"
    assert config.stt.options["automatic_punctuation"] is True

    assert config.tts.provider == "voxcpm"
    assert config.tts.options["server"] == "http://127.0.0.1:8000"
    assert config.tts.options["model"] == "openbmb/VoxCPM2"
    assert config.tts.options["voice"] == "default"

    assert config.agent.provider == "mock"


def test_load_config_missing_file(tmp_path):
    with pytest.raises(
        FileNotFoundError,
        match="Configuration file not found",
    ):
        load_config(
            environment="development",
            config_dir=tmp_path,
        )


def test_load_config_empty_file(tmp_path):
    config_file = tmp_path / "development.yaml"
    config_file.write_text(
        "",
        encoding="utf-8",
    )

    with pytest.raises(
        ValueError,
        match="Configuration file is empty",
    ):
        load_config(
            environment="development",
            config_dir=tmp_path,
        )


def test_load_config_root_must_be_mapping(tmp_path):
    config_file = tmp_path / "development.yaml"
    config_file.write_text(
        "- item1\n- item2\n",
        encoding="utf-8",
    )

    with pytest.raises(
        ValueError,
        match="Configuration root must be a mapping",
    ):
        load_config(
            environment="development",
            config_dir=tmp_path,
        )


def test_load_config_validates_required_fields(tmp_path):
    config_file = tmp_path / "development.yaml"

    config_file.write_text(
        yaml.safe_dump(
            {
                "stt": {
                    "provider": "nvidia",
                    "server": "127.0.0.1:9000",
                    "language": "pt-BR",
                },
                "tts": {
                    "provider": "voxcpm",
                    "server": "http://127.0.0.1:8000",
                    "model": "openbmb/VoxCPM2",
                    "voice": "default",
                },
                # agent intentionally missing
            }
        ),
        encoding="utf-8",
    )

    with pytest.raises(
        Exception,
        match="agent",
    ):
        load_config(
            environment="development",
            config_dir=tmp_path,
        )

def test_load_provider_catalog():
    catalog = load_provider_catalog()

    assert "nvidia" in catalog.providers["stt"]
    assert "voxcpm" in catalog.providers["tts"]
    assert "mock" in catalog.providers["agent"]

    voxcpm = catalog.providers["tts"]["voxcpm"]

    assert voxcpm.name == "VoxCPM"
    assert (
        voxcpm.implementation
        == "voice_assistant.tts.voxcpm:VoxCPMTTSAdapter"
    )
    assert voxcpm.capabilities == {
        "realtime": True,
        "streaming": True,
    }


def test_load_provider_catalog_missing_file(tmp_path):
    with pytest.raises(
        FileNotFoundError,
        match="Provider catalog not found",
    ):
        load_provider_catalog(
            config_dir=tmp_path,
        )


def test_load_config_uses_development_app_env(
    tmp_path,
    monkeypatch,
):
    development = tmp_path / "development.yaml"

    development.write_text(
        """
stt:
  provider: nvidia
  options:
    server: "dev-asr"

tts:
  provider: voxcpm
  options:
    server: "dev-tts"
    model: "dev-model"
    voice: "default"

agent:
  provider: mock
  options: {}
""",
        encoding="utf-8",
    )

    monkeypatch.setenv(
        "APP_ENV",
        "development",
    )

    config = load_config(
        config_dir=tmp_path,
    )

    assert config.stt.options["server"] == "dev-asr"
    assert config.tts.options["server"] == "dev-tts"
    assert config.tts.options["model"] == "dev-model"


def test_load_config_rejects_unknown_environment(
    tmp_path,
):
    with pytest.raises(
        FileNotFoundError,
        match="Configuration file not found",
    ):
        load_config(
            environment="does-not-exist",
            config_dir=tmp_path,
        )

def test_load_config_uses_staging_app_env(
    tmp_path,
    monkeypatch,
):
    config_file = tmp_path / "staging.yaml"

    config_file.write_text(
        """
stt:
  provider: nvidia
  options:
    server: "staging-asr:9000"

tts:
  provider: voxcpm
  options:
    server: "http://staging-tts:8000"
    model: "staging-model"
    voice: "staging-voice"

agent:
  provider: mock
  options: {}
""",
        encoding="utf-8",
    )

    monkeypatch.setenv(
        "APP_ENV",
        "staging",
    )

    config = load_config(
        config_dir=tmp_path,
    )

    assert config.stt.provider == "nvidia"
    assert (
        config.stt.options["server"]
        == "staging-asr:9000"
    )

    assert config.tts.provider == "voxcpm"
    assert (
        config.tts.options["server"]
        == "http://staging-tts:8000"
    )

    assert config.tts.options["model"] == "staging-model"
    assert config.tts.options["voice"] == "staging-voice"

    assert config.agent.provider == "mock"