"""Unit tests for the validation engine."""

import pytest

from envschema.schema import Schema, EnvVar, EnvVarType
from envschema.core import ValidationEngine, ValidationResult


class TestValidationResult:
    """Tests for ValidationResult."""

    def test_valid_result(self):
        result = ValidationResult(is_valid=True)
        assert result.is_valid is True
        assert result.missing_required == []
        assert result.type_errors == []
        assert result.pattern_errors == []
        assert result.warnings == []

    def test_result_to_dict(self):
        result = ValidationResult(is_valid=True)
        d = result.to_dict()
        assert d["is_valid"] is True
        assert d["missing_required"] == []


class TestValidationEngine:
    """Tests for ValidationEngine."""

    def test_validate_empty_env(self):
        schema = Schema(envvars=[])
        engine = ValidationEngine(schema)
        result = engine.validate({})
        assert result.is_valid is True

    def test_validate_missing_required(self):
        schema = Schema(
            envvars=[
                EnvVar(name="REQUIRED_VAR", required=True),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({})
        assert result.is_valid is False
        assert "REQUIRED_VAR" in result.missing_required

    def test_validate_present_required(self):
        schema = Schema(
            envvars=[
                EnvVar(name="REQUIRED_VAR", required=True),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"REQUIRED_VAR": "value"})
        assert result.is_valid is True

    def test_validate_optional_missing(self):
        schema = Schema(
            envvars=[
                EnvVar(name="OPTIONAL_VAR", required=False),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({})
        assert result.is_valid is True

    def test_validate_with_default(self):
        schema = Schema(
            envvars=[
                EnvVar(name="VAR_WITH_DEFAULT", required=False, default="default_value"),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({})
        assert result.is_valid is True

    def test_validate_string_type(self):
        schema = Schema(
            envvars=[
                EnvVar(name="STRING_VAR", type=EnvVarType.STRING),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"STRING_VAR": "any value"})
        assert result.is_valid is True

    def test_validate_integer_type_valid(self):
        schema = Schema(
            envvars=[
                EnvVar(name="INT_VAR", type=EnvVarType.INTEGER),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"INT_VAR": "42"})
        assert result.is_valid is True

    def test_validate_integer_type_invalid(self):
        schema = Schema(
            envvars=[
                EnvVar(name="INT_VAR", type=EnvVarType.INTEGER),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"INT_VAR": "not_a_number"})
        assert result.is_valid is False
        assert len(result.type_errors) == 1
        assert result.type_errors[0].var_name == "INT_VAR"

    def test_validate_boolean_type_valid(self):
        schema = Schema(
            envvars=[
                EnvVar(name="BOOL_VAR", type=EnvVarType.BOOLEAN),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"BOOL_VAR": "true"})
        assert result.is_valid is True

    def test_validate_boolean_type_invalid(self):
        schema = Schema(
            envvars=[
                EnvVar(name="BOOL_VAR", type=EnvVarType.BOOLEAN),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"BOOL_VAR": "maybe"})
        assert result.is_valid is False

    def test_validate_list_type_valid(self):
        schema = Schema(
            envvars=[
                EnvVar(name="LIST_VAR", type=EnvVarType.LIST),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"LIST_VAR": "a,b,c"})
        assert result.is_valid is True

    def test_validate_list_type_invalid(self):
        schema = Schema(
            envvars=[
                EnvVar(name="LIST_VAR", type=EnvVarType.LIST),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"LIST_VAR": "single_value"})
        assert result.is_valid is False

    def test_validate_pattern_match(self):
        schema = Schema(
            envvars=[
                EnvVar(name="PATTERN_VAR", type=EnvVarType.STRING, pattern=r"^[A-Z]+$"),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"PATTERN_VAR": "VALID"})
        assert result.is_valid is True

    def test_validate_pattern_no_match(self):
        schema = Schema(
            envvars=[
                EnvVar(name="PATTERN_VAR", type=EnvVarType.STRING, pattern=r"^[A-Z]+$"),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"PATTERN_VAR": "invalid"})
        assert result.is_valid is False

    def test_validate_extra_var_warning(self):
        schema = Schema(
            envvars=[
                EnvVar(name="KNOWN_VAR", type=EnvVarType.STRING),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"KNOWN_VAR": "value", "UNKNOWN_VAR": "other"})
        assert result.is_valid is True
        assert "Unknown environment variable: UNKNOWN_VAR" in result.warnings

    def test_validate_case_insensitive(self):
        schema = Schema(
            envvars=[
                EnvVar(name="TEST_VAR", required=True),
            ]
        )
        engine = ValidationEngine(schema)
        result = engine.validate({"test_var": "value"})
        assert result.is_valid is True