"""Unit tests for schema parsing."""

import json
import tempfile
from pathlib import Path

import pytest

from envschema.schema import (
    Schema,
    EnvVar,
    EnvVarType,
    load_schema_from_file,
    load_json_schema,
    load_yaml_schema,
)


class TestEnvVar:
    """Tests for EnvVar model."""

    def test_env_var_creation(self):
        var = EnvVar(name="TEST_VAR", type=EnvVarType.STRING)
        assert var.name == "TEST_VAR"
        assert var.type == EnvVarType.STRING
        assert var.required is False
        assert var.default is None

    def test_env_var_with_all_fields(self):
        var = EnvVar(
            name="DATABASE_URL",
            type=EnvVarType.STRING,
            required=True,
            default="postgres://localhost",
            description="Database connection string",
            pattern=r"^postgres://.*",
        )
        assert var.required is True
        assert var.default == "postgres://localhost"
        assert var.description == "Database connection string"
        assert var.pattern == r"^postgres://.*"

    def test_env_var_name_uppercase(self):
        var = EnvVar(name="test_var")
        assert var.name == "TEST_VAR"

    def test_env_var_invalid_name(self):
        with pytest.raises(ValueError):
            EnvVar(name="invalid name with spaces")


class TestSchema:
    """Tests for Schema model."""

    def test_schema_creation(self):
        schema = Schema()
        assert schema.version == "1.0"
        assert schema.envvars == []

    def test_schema_with_vars(self):
        schema = Schema(
            envvars=[
                EnvVar(name="VAR1", type=EnvVarType.STRING),
                EnvVar(name="VAR2", type=EnvVarType.INTEGER, required=True),
            ]
        )
        assert len(schema.envvars) == 2

    def test_get_var(self):
        schema = Schema(
            envvars=[
                EnvVar(name="DATABASE_URL", type=EnvVarType.STRING),
            ]
        )
        var = schema.get_var("DATABASE_URL")
        assert var is not None
        assert var.name == "DATABASE_URL"

    def test_get_var_case_insensitive(self):
        schema = Schema(
            envvars=[
                EnvVar(name="DATABASE_URL", type=EnvVarType.STRING),
            ]
        )
        var = schema.get_var("database_url")
        assert var is not None

    def test_get_var_not_found(self):
        schema = Schema()
        var = schema.get_var("NONEXISTENT")
        assert var is None

    def test_get_required_vars(self):
        schema = Schema(
            envvars=[
                EnvVar(name="VAR1", required=True),
                EnvVar(name="VAR2", required=False),
                EnvVar(name="VAR3", required=True),
            ]
        )
        required = schema.get_required_vars()
        assert len(required) == 2
        assert {v.name for v in required} == {"VAR1", "VAR3"}


class TestLoadJsonSchema:
    """Tests for JSON schema loading."""

    def test_load_valid_json_schema(self):
        json_content = json.dumps({
            "version": "1.0",
            "envVars": [
                {"name": "TEST_VAR", "type": "str"}
            ]
        })
        schema = load_json_schema(json_content)
        assert schema.version == "1.0"
        assert len(schema.envvars) == 1

    def test_load_invalid_json(self):
        with pytest.raises(ValueError, match="Invalid JSON"):
            load_json_schema("not valid json")

    def test_load_invalid_schema_structure(self):
        with pytest.raises((ValueError, Exception), match="Invalid schema"):
            load_json_schema('{"version": "1.0", "envVars": [{"name": "VAR", "type": "invalid_type"}]}')


class TestLoadYamlSchema:
    """Tests for YAML schema loading."""

    def test_load_valid_yaml_schema(self):
        yaml_content = """
version: "1.0"
envVars:
  - name: TEST_VAR
    type: str
"""
        schema = load_yaml_schema(yaml_content)
        assert schema.version == "1.0"
        assert len(schema.envvars) == 1

    def test_load_invalid_yaml(self):
        with pytest.raises(ValueError, match="Invalid YAML"):
            load_yaml_schema("invalid: yaml: content:")


class TestLoadSchemaFromFile:
    """Tests for file-based schema loading."""

    def test_load_json_file(self, tmp_path):
        schema_file = tmp_path / "schema.json"
        schema_file.write_text(json.dumps({
            "version": "1.0",
            "envVars": [{"name": "TEST", "type": "str"}]
        }))
        schema = load_schema_from_file(str(schema_file))
        assert schema.version == "1.0"

    def test_load_yaml_file(self, tmp_path):
        schema_file = tmp_path / "schema.yaml"
        schema_file.write_text('version: "1.0"\nenvVars: []')
        schema = load_schema_from_file(str(schema_file))
        assert schema.version == "1.0"

    def test_file_not_found(self):
        with pytest.raises(FileNotFoundError):
            load_schema_from_file("/nonexistent/path/schema.json")

    def test_unsupported_format(self, tmp_path):
        schema_file = tmp_path / "schema.txt"
        schema_file.write_text("some content")
        with pytest.raises(ValueError, match="Unsupported schema format"):
            load_schema_from_file(str(schema_file))