"""Tests for template loading in app.registry."""

from __future__ import annotations

from pathlib import Path

import pytest

from app.registry import AgentRegistry

TEMPLATES_DIR = Path(__file__).parent.parent.parent / "templates"


@pytest.mark.unit
class TestListTemplates:
    def test_lists_all_templates(self) -> None:
        templates = AgentRegistry.list_templates(TEMPLATES_DIR)
        assert "e-commerce" in templates
        assert "saas" in templates
        assert "fintech" in templates

    def test_returns_sorted(self) -> None:
        templates = AgentRegistry.list_templates(TEMPLATES_DIR)
        assert templates == tuple(sorted(templates))

    def test_empty_dir_returns_empty(self, tmp_path: Path) -> None:
        templates = AgentRegistry.list_templates(tmp_path)
        assert templates == ()

    def test_nonexistent_dir_returns_empty(self) -> None:
        templates = AgentRegistry.list_templates("/nonexistent/path")
        assert templates == ()


@pytest.mark.unit
class TestLoadTemplate:
    def test_load_ecommerce(self) -> None:
        registry = AgentRegistry.load_template("e-commerce", TEMPLATES_DIR)
        assert len(registry) == 4
        agents = registry.list_agents()
        names = {a.name for a in agents}
        assert "order_lookup" in names
        assert "discount" in names
        assert "fallback" in names

    def test_load_saas(self) -> None:
        registry = AgentRegistry.load_template("saas", TEMPLATES_DIR)
        assert len(registry) == 3
        agents = registry.list_agents()
        names = {a.name for a in agents}
        assert "account_lookup" in names
        assert "subscription_management" in names

    def test_load_fintech(self) -> None:
        registry = AgentRegistry.load_template("fintech", TEMPLATES_DIR)
        assert len(registry) == 3
        agents = registry.list_agents()
        names = {a.name for a in agents}
        assert "transaction_lookup" in names
        assert "dispute_handler" in names

    def test_nonexistent_template_raises(self) -> None:
        with pytest.raises(FileNotFoundError, match="not found"):
            AgentRegistry.load_template("nonexistent", TEMPLATES_DIR)

    def test_error_message_lists_available(self) -> None:
        try:
            AgentRegistry.load_template("nonexistent", TEMPLATES_DIR)
        except FileNotFoundError as exc:
            assert "e-commerce" in str(exc)