import pytest
from src.core.templating import TemplatingEngine


class TestTemplatingEngine:
    def setup_method(self):
        self.engine = TemplatingEngine()

    def test_render_simple_template(self):
        template = "Hello, {{name}}!"
        context = {"name": "World"}
        result = self.engine.render_template(template, context)
        assert result == "Hello, World!"

    def test_render_template_with_path_param(self):
        template = "User ID: {{request.path.id}}"
        context = {"request": {"path": {"id": "123"}}}
        result = self.engine.render_template(template, context)
        assert result == "User ID: 123"

    def test_render_template_with_query_param(self):
        template = "Page: {{request.query.page}}"
        context = {"request": {"query": {"page": "5"}}}
        result = self.engine.render_template(template, context)
        assert result == "Page: 5"

    def test_render_dict_simple(self):
        data = {
            "message": "Hello {{name}}",
            "count": 42
        }
        context = {"name": "World"}
        result = self.engine.render_dict(data, context)
        assert result["message"] == "Hello World"
        assert result["count"] == 42

    def test_render_dict_nested(self):
        data = {
            "user": {
                "name": "{{name}}",
                "id": "{{uuid}}"
            }
        }
        context = {"name": "John", "uuid": "abc123"}
        result = self.engine.render_dict(data, context)
        assert result["user"]["name"] == "John"
        assert result["user"]["id"] == "abc123"

    def test_render_dict_list(self):
        data = {
            "items": [
                {"name": "{{name}}"},
                "static"
            ]
        }
        context = {"name": "Test"}
        result = self.engine.render_dict(data, context)
        assert result["items"][0]["name"] == "Test"
        assert result["items"][1] == "static"

    def test_render_dict_non_string(self):
        data = {
            "count": 100,
            "active": True,
            "items": [1, 2, 3]
        }
        context = {}
        result = self.engine.render_dict(data, context)
        assert result["count"] == 100
        assert result["active"] is True
        assert result["items"] == [1, 2, 3]

    def test_build_context(self):
        context = self.engine.build_context(
            path_params={"id": "123"},
            query_params={"page": "1"},
            headers={"Authorization": "Bearer token"},
            body={"name": "test"},
            extra={"custom": "value"}
        )
        assert context["request"]["path"]["id"] == "123"
        assert context["request"]["query"]["page"] == "1"
        assert context["request"]["headers"]["Authorization"] == "Bearer token"
        assert context["request"]["body"]["name"] == "test"
        assert context["custom"] == "value"
        assert "uuid" in context
        assert "timestamp" in context

    def test_build_context_defaults(self):
        context = self.engine.build_context()
        assert context["request"]["path"] == {}
        assert context["request"]["query"] == {}
        assert context["request"]["headers"] == {}
        assert context["request"]["body"] == {}

    def test_template_filters(self):
        template = "{{name|upper}}"
        context = {"name": "hello"}
        result = self.engine.render_template(template, context)
        assert result == "HELLO"

    def test_template_default_filter(self):
        template = "{{value|default('N/A')}}"
        context = {"value": None}
        result = self.engine.render_template(template, context)
        assert result == "N/A"

    def test_template_length_filter(self):
        template = "{{items|length}}"
        context = {"items": [1, 2, 3]}
        result = self.engine.render_template(template, context)
        assert result == "3"

    def test_template_globals(self):
        template = "ID: {{uuid}}, Time: {{timestamp}}"
        context = self.engine.build_context()
        result = self.engine.render_template(template, context)
        assert "ID:" in result
        assert "Time:" in result

    def test_template_datetime(self):
        template = "Now: {{datetime}}"
        context = self.engine.build_context()
        result = self.engine.render_template(template, context)
        assert "Now:" in result

    def test_template_random_int(self):
        template = "Random: {{random_int(1, 10)}}"
        context = {}
        result = self.engine.render_template(template, context)
        assert "Random:" in result

    def test_template_random_string(self):
        template = "String: {{random_string(8)}}"
        context = {}
        result = self.engine.render_template(template, context)
        assert "String:" in result