"""Tests for project context utilities (no standard-library mock usage).

These functions are config/env driven, so we use the real ConfigManager-backed
test config file and pytest monkeypatch for environment variables.
"""

from __future__ import annotations

import pytest


@pytest.mark.asyncio
async def test_returns_none_when_no_default_and_no_project(config_manager, monkeypatch):
    from basic_memory.mcp.project_context import resolve_project_parameter

    cfg = config_manager.load_config()
    cfg.default_project = None
    config_manager.save_config(cfg)

    monkeypatch.delenv("BASIC_MEMORY_MCP_PROJECT", raising=False)
    assert await resolve_project_parameter(project=None, allow_discovery=False) is None


@pytest.mark.asyncio
async def test_allows_discovery_when_enabled(config_manager):
    from basic_memory.mcp.project_context import resolve_project_parameter

    cfg = config_manager.load_config()
    cfg.default_project = None
    config_manager.save_config(cfg)

    assert await resolve_project_parameter(project=None, allow_discovery=True) is None


@pytest.mark.asyncio
async def test_returns_project_when_specified(config_manager):
    from basic_memory.mcp.project_context import resolve_project_parameter

    cfg = config_manager.load_config()
    config_manager.save_config(cfg)

    assert await resolve_project_parameter(project="my-project") == "my-project"


@pytest.mark.asyncio
async def test_uses_env_var_priority(config_manager, monkeypatch):
    from basic_memory.mcp.project_context import resolve_project_parameter

    cfg = config_manager.load_config()
    config_manager.save_config(cfg)

    monkeypatch.setenv("BASIC_MEMORY_MCP_PROJECT", "env-project")
    assert await resolve_project_parameter(project="explicit-project") == "env-project"


@pytest.mark.asyncio
async def test_uses_explicit_project_when_no_env(config_manager, monkeypatch):
    from basic_memory.mcp.project_context import resolve_project_parameter

    cfg = config_manager.load_config()
    config_manager.save_config(cfg)

    monkeypatch.delenv("BASIC_MEMORY_MCP_PROJECT", raising=False)
    assert await resolve_project_parameter(project="explicit-project") == "explicit-project"


@pytest.mark.asyncio
async def test_uses_default_project(config_manager, config_home, monkeypatch):
    from basic_memory.mcp.project_context import resolve_project_parameter
    from basic_memory.config import ProjectEntry

    cfg = config_manager.load_config()
    (config_home / "default-project").mkdir(parents=True, exist_ok=True)
    cfg.projects["default-project"] = ProjectEntry(path=str(config_home / "default-project"))
    cfg.default_project = "default-project"
    config_manager.save_config(cfg)

    monkeypatch.delenv("BASIC_MEMORY_MCP_PROJECT", raising=False)
    assert await resolve_project_parameter(project=None) == "default-project"


@pytest.mark.asyncio
async def test_returns_none_when_no_default(config_manager, monkeypatch):
    from basic_memory.mcp.project_context import resolve_project_parameter

    cfg = config_manager.load_config()
    cfg.default_project = None
    config_manager.save_config(cfg)

    monkeypatch.delenv("BASIC_MEMORY_MCP_PROJECT", raising=False)
    assert await resolve_project_parameter(project=None) is None


@pytest.mark.asyncio
async def test_env_constraint_overrides_default(config_manager, config_home, monkeypatch):
    from basic_memory.mcp.project_context import resolve_project_parameter
    from basic_memory.config import ProjectEntry

    cfg = config_manager.load_config()
    (config_home / "default-project").mkdir(parents=True, exist_ok=True)
    cfg.projects["default-project"] = ProjectEntry(path=str(config_home / "default-project"))
    cfg.default_project = "default-project"
    config_manager.save_config(cfg)

    monkeypatch.setenv("BASIC_MEMORY_MCP_PROJECT", "env-project")
    assert await resolve_project_parameter(project=None) == "env-project"