"""Adapter factory and config resolution (CYA-WP-0008)."""

import os
from pathlib import Path

import pytest

from cya.config import bound_session_turns, load_llm_settings
from cya.llm.adapter import FakeLLMAdapter
from cya.llm.connect_adapter import LLMConnectAdapter
from cya.llm.factory import get_adapter


def test_default_adapter_is_fake(monkeypatch):
    monkeypatch.delenv("CYA_LLM_ADAPTER", raising=False)
    monkeypatch.setattr("cya.config._USER_CONFIG", Path("/nonexistent/config.toml"))
    adapter = get_adapter()
    assert isinstance(adapter, FakeLLMAdapter)


def test_offline_forces_fake(monkeypatch, tmp_path):
    cfg = tmp_path / "config.toml"
    cfg.write_text('[llm]\nadapter = "connect"\nbackend = "openrouter"\n')
    monkeypatch.setattr("cya.config._USER_CONFIG", cfg)
    adapter = get_adapter(offline=True)
    assert isinstance(adapter, FakeLLMAdapter)


def test_connect_adapter_when_configured(monkeypatch, tmp_path):
    cfg = tmp_path / "config.toml"
    cfg.write_text('[llm]\nadapter = "connect"\nbackend = "mock"\n')
    monkeypatch.setattr("cya.config._USER_CONFIG", cfg)
    adapter = get_adapter()
    assert isinstance(adapter, LLMConnectAdapter)


def test_env_adapter_override(monkeypatch):
    monkeypatch.setenv("CYA_LLM_ADAPTER", "connect")
    monkeypatch.setenv("CYA_LLM_BACKEND", "mock")
    adapter = get_adapter()
    assert isinstance(adapter, LLMConnectAdapter)


def test_load_llm_settings_merges_project_config(monkeypatch, tmp_path):
    user_cfg = tmp_path / "user.toml"
    user_cfg.write_text('[llm]\nbackend = "openrouter"\nmodel = "from-user"\n')
    project_cfg = tmp_path / ".cya.toml"
    project_cfg.write_text('[llm]\nmodel = "from-project"\n')
    monkeypatch.setattr("cya.config._USER_CONFIG", user_cfg)
    monkeypatch.setattr("cya.config._find_project_config", lambda start=None: project_cfg)

    settings = load_llm_settings()
    assert settings.backend == "openrouter"
    assert settings.model == "from-project"
    assert settings.adapter == "connect"


def test_bound_session_turns_limits():
    turns = [
        {"user": "a" * 1000, "assistant": "b" * 1000},
        {"user": "c" * 1000, "assistant": "d" * 1000},
        {"user": "e", "assistant": "f"},
    ]
    bounded = bound_session_turns(turns, max_turns=10, max_chars=2500)
    assert len(bounded) >= 1
    total = sum(len(t["user"]) + len(t["assistant"]) for t in bounded)
    assert total <= 2500 or len(bounded) == 1