"""Unit tests for config.py pure functions."""

import os
import sys
from pathlib import Path

import pytest

sys.path.insert(0, str(Path(__file__).parent.parent / "skills" / "ir_generation_skill"))
import config


def test_set_input_file():
    original = config.INPUT_JSON
    try:
        config.set_input_file("/tmp/test_input.json")
        assert config.INPUT_JSON == "/tmp/test_input.json"
    finally:
        config.set_input_file(original)


def test_no_hardcoded_input_file():
    """INPUT_JSON should not have a hardcoded default — comes from env or None."""
    # When IR_INPUT_JSON env is not set, INPUT_JSON should be None
    env_val = os.environ.pop("IR_INPUT_JSON", None)
    try:
        import importlib
        importlib.reload(config)
        # After reload without env var, INPUT_JSON should be None
        assert config.INPUT_JSON is None, \
            f"INPUT_JSON should be None when env not set, got: {config.INPUT_JSON}"
    finally:
        if env_val is not None:
            os.environ["IR_INPUT_JSON"] = env_val
        importlib.reload(config)


def test_set_input_file_accepts_none():
    """set_input_file(None) should work for resetting."""
    original = config.INPUT_JSON
    try:
        config.set_input_file("/tmp/test.json")
        config.set_input_file(None)
        assert config.INPUT_JSON is None
    finally:
        config.set_input_file(original)


def test_config_constants_exist():
    """Verify all expected path constants are defined."""
    assert config.BASE_DIR
    assert config.PROJECT_ROOT
    assert config.PROJECT_OUTPUT
    assert config.IR_OUTPUT
    assert config.FINAL_OUTPUT
    assert config.OUTPUT_DIR
    assert config.PROMPTS_DIR
    assert config.TESTS_DIR
    assert config.DOC_PARSER_OUTPUT
    assert config.SEMANTIC_INDEX_JSON
    assert config.IR_FRAGMENTS_JSON
    assert config.PATH_ENUM_JSON
    assert config.IR_AUTOCOMPLETE_FRAGMENTS_JSON
    assert config.IR_FINAL_JSON
    assert config.IR_AUDIT_REPORT_MD


def test_output_dir_is_under_project_root():
    """PROJECT_OUTPUT, IR_OUTPUT, FINAL_OUTPUT should all be under PROJECT_ROOT."""
    assert config.PROJECT_OUTPUT.startswith(config.PROJECT_ROOT)
    assert config.IR_OUTPUT.startswith(config.PROJECT_OUTPUT)
    assert config.FINAL_OUTPUT.startswith(config.PROJECT_OUTPUT)


def test_output_dir_structure():
    """IR files should go to output/ir/, final deliverable to output/final/."""
    assert config.IR_OUTPUT.endswith(os.path.join("output", "ir"))
    assert config.FINAL_OUTPUT.endswith(os.path.join("output", "final"))
    assert config.SEMANTIC_INDEX_JSON.startswith(config.IR_OUTPUT)
    assert config.IR_FRAGMENTS_JSON.startswith(config.IR_OUTPUT)
    assert config.IR_FINAL_JSON.startswith(config.FINAL_OUTPUT)
    assert config.IR_AUDIT_REPORT_MD.startswith(config.FINAL_OUTPUT)


def test_ensemble_temperatures_count():
    """Should have exactly 3 ensemble temperatures."""
    assert len(config.ENSEMBLE_TEMPERATURES) == 3


def test_max_tokens_is_int():
    assert isinstance(config.MAX_TOKENS, int)
    assert config.MAX_TOKENS > 0


def test_temperature_is_float():
    assert isinstance(config.TEMPERATURE, float)
    assert 0.0 <= config.TEMPERATURE <= 2.0


def test_provider_models_has_expected_keys():
    assert "deepseek" in config.PROVIDER_MODELS
    assert "dashscope" in config.PROVIDER_MODELS


def test_model_name_in_provider_models():
    assert config.MODEL_NAME in config.PROVIDER_MODELS.values()