"""Tests for tool settings functionality."""

import pytest
import tempfile
import shutil
from pathlib import Path

import yaml

from cmdforge.tool import ensure_settings, save_tool, load_tool, Tool
from cmdforge.runner import substitute_variables


class TestEnsureSettings:
    """Tests for ensure_settings helper function."""

    def test_creates_settings_from_defaults(self, tmp_path):
        """Settings.yaml created when defaults.yaml exists."""
        tool_dir = tmp_path / "my-tool"
        tool_dir.mkdir()

        # Create defaults.yaml
        defaults_path = tool_dir / "defaults.yaml"
        defaults_path.write_text("backend: piper\nendpoint: http://localhost:5001\n")

        # Ensure settings.yaml doesn't exist yet
        settings_path = tool_dir / "settings.yaml"
        assert not settings_path.exists()

        # Call ensure_settings
        result = ensure_settings(tool_dir)

        # Check settings.yaml was created
        assert result == settings_path
        assert settings_path.exists()
        assert settings_path.read_text() == defaults_path.read_text()

    def test_preserves_existing_settings(self, tmp_path):
        """Existing settings.yaml not overwritten."""
        tool_dir = tmp_path / "my-tool"
        tool_dir.mkdir()

        # Create defaults.yaml
        defaults_path = tool_dir / "defaults.yaml"
        defaults_path.write_text("backend: piper\n")

        # Create existing settings.yaml with different content
        settings_path = tool_dir / "settings.yaml"
        settings_path.write_text("backend: google\napi_key: my-key\n")

        # Call ensure_settings
        result = ensure_settings(tool_dir)

        # Check settings.yaml was not overwritten
        assert result == settings_path
        assert settings_path.read_text() == "backend: google\napi_key: my-key\n"

    def test_no_defaults_returns_none(self, tmp_path):
        """Returns None when no defaults.yaml exists."""
        tool_dir = tmp_path / "my-tool"
        tool_dir.mkdir()

        result = ensure_settings(tool_dir)

        assert result is None
        assert not (tool_dir / "settings.yaml").exists()

    def test_existing_settings_no_defaults_returns_path(self, tmp_path):
        """Returns settings path when settings exists but defaults doesn't."""
        tool_dir = tmp_path / "my-tool"
        tool_dir.mkdir()

        # Create only settings.yaml
        settings_path = tool_dir / "settings.yaml"
        settings_path.write_text("custom: value\n")

        result = ensure_settings(tool_dir)

        assert result == settings_path


class TestSubstituteVariablesSettings:
    """Tests for {settings.key} substitution in templates."""

    def test_settings_scalar_string(self):
        """Template substitution works for string settings."""
        variables = {"settings": {"backend": "piper"}}
        result = substitute_variables("Using {settings.backend}", variables)
        assert result == "Using piper"

    def test_settings_scalar_int(self):
        """Template substitution works for int settings."""
        variables = {"settings": {"port": 5001}}
        result = substitute_variables("Port: {settings.port}", variables)
        assert result == "Port: 5001"

    def test_settings_scalar_float(self):
        """Template substitution works for float settings."""
        variables = {"settings": {"threshold": 0.75}}
        result = substitute_variables("Threshold: {settings.threshold}", variables)
        assert result == "Threshold: 0.75"

    def test_settings_scalar_bool(self):
        """Template substitution works for bool settings."""
        variables = {"settings": {"enabled": True}}
        result = substitute_variables("Enabled: {settings.enabled}", variables)
        assert result == "Enabled: True"

    def test_settings_nonscalar_unchanged(self, capsys):
        """Non-scalar settings leave placeholder unchanged and warn."""
        variables = {"settings": {"items": ["a", "b", "c"]}}
        result = substitute_variables("Items: {settings.items}", variables, warn_non_scalar=True)

        # Placeholder should be unchanged
        assert result == "Items: {settings.items}"

        # Should have printed a warning
        captured = capsys.readouterr()
        assert "not a scalar value" in captured.err

    def test_settings_missing_key_unchanged(self):
        """Missing settings key leaves placeholder unchanged."""
        variables = {"settings": {"backend": "piper"}}
        result = substitute_variables("API: {settings.api_key}", variables)
        assert result == "API: {settings.api_key}"

    def test_settings_empty_dict(self):
        """Empty settings dict leaves placeholders unchanged."""
        variables = {"settings": {}}
        result = substitute_variables("Backend: {settings.backend}", variables)
        assert result == "Backend: {settings.backend}"

    def test_mixed_variables_and_settings(self):
        """Regular variables and settings work together."""
        variables = {
            "input": "Hello",
            "name": "World",
            "settings": {"backend": "piper"}
        }
        result = substitute_variables(
            "{input} {name}! Using {settings.backend}.",
            variables
        )
        assert result == "Hello World! Using piper."

    def test_escaped_braces_preserved(self):
        """Escaped braces {{}} work with settings."""
        variables = {"settings": {"key": "value"}}
        result = substitute_variables(
            "{{literal}} and {settings.key}",
            variables
        )
        assert result == "{literal} and value"


class TestRunnerLoadsSettings:
    """Integration tests for runner loading settings."""

    def test_settings_available_in_code_step(self, monkeypatch, tmp_path):
        """Settings dict is available in code steps."""
        from cmdforge.tool import TOOLS_DIR
        from cmdforge.runner import run_tool

        # Patch TOOLS_DIR
        monkeypatch.setattr("cmdforge.tool.TOOLS_DIR", tmp_path)

        # Create tool directory with config and settings
        tool_dir = tmp_path / "test-settings-tool"
        tool_dir.mkdir()

        config = {
            "name": "test-settings-tool",
            "description": "Test tool",
            "steps": [
                {
                    "type": "code",
                    "code": "result = f\"backend={settings.get('backend', 'none')}\"",
                    "output_var": "result"
                }
            ],
            "output": "{result}"
        }
        (tool_dir / "config.yaml").write_text(yaml.dump(config))

        settings = {"backend": "piper", "api_key": "test-key"}
        (tool_dir / "settings.yaml").write_text(yaml.dump(settings))

        # Load and run the tool
        tool = load_tool("test-settings-tool")
        output, exit_code = run_tool(tool, "test input", {})

        assert exit_code == 0
        assert "backend=piper" in output