"""Tests for the general-purpose GRPO trainer."""

from __future__ import annotations

from unittest.mock import MagicMock, patch


class TestGRPOConfig:
    def test_default_config(self) -> None:
        from openjarvis.core.config import GRPOConfig

        cfg = GRPOConfig()
        assert cfg.model_name == "Qwen/Qwen3-1.7B"
        assert cfg.num_samples_per_prompt == 8
        assert cfg.kl_coef == 0.0001
        assert cfg.clip_ratio == 0.2
        assert cfg.min_prompts == 10


class TestDefaultRewardFn:
    def test_score_returns_float(self) -> None:
        from openjarvis.learning.intelligence.grpo_trainer import DefaultRewardFn

        reward = DefaultRewardFn()
        score = reward.score("prompt", "response", None)
        assert isinstance(score, float)
        assert 0.0 <= score <= 1.0

    def test_score_with_ground_truth(self) -> None:
        from openjarvis.learning.intelligence.grpo_trainer import DefaultRewardFn

        reward = DefaultRewardFn()
        # When response matches ground truth, score should be higher
        score_match = reward.score("what is 2+2?", "4", "4")
        score_no_match = reward.score("what is 2+2?", "5", "4")
        assert score_match > score_no_match


class TestGRPOTrainer:
    def test_init(self) -> None:
        from openjarvis.core.config import GRPOConfig
        from openjarvis.learning.intelligence.grpo_trainer import GRPOTrainer

        cfg = GRPOConfig()
        trainer = GRPOTrainer(cfg)
        assert trainer.config is cfg

    def test_train_on_prompts_empty(self) -> None:
        from openjarvis.core.config import GRPOConfig
        from openjarvis.learning.intelligence.grpo_trainer import GRPOTrainer

        trainer = GRPOTrainer(GRPOConfig())
        result = trainer.train_on_prompts([])
        assert result["status"] == "skipped"

    def test_train_on_prompts_too_few(self) -> None:
        from openjarvis.core.config import GRPOConfig
        from openjarvis.learning.intelligence.grpo_trainer import GRPOTrainer

        trainer = GRPOTrainer(GRPOConfig(min_prompts=5))
        result = trainer.train_on_prompts(["hello"])
        assert result["status"] == "skipped"
        assert "min_prompts" in result.get("reason", "")

    def test_custom_reward_fn(self) -> None:
        from openjarvis.core.config import GRPOConfig
        from openjarvis.learning.intelligence.grpo_trainer import GRPOTrainer

        class MyReward:
            def score(
                self, prompt: str, response: str, ground_truth: str | None
            ) -> float:
                return 0.42

        trainer = GRPOTrainer(GRPOConfig(), reward_fn=MyReward())
        assert trainer.reward_fn.score("a", "b", None) == 0.42

    def test_train_delegates_to_miner(self) -> None:
        from openjarvis.core.config import GRPOConfig
        from openjarvis.learning.intelligence.grpo_trainer import GRPOTrainer

        trainer = GRPOTrainer(GRPOConfig(min_prompts=1))
        mock_store = MagicMock()

        with patch.object(trainer, "_mine_prompts", return_value=[]) as mock_mine:
            result = trainer.train(mock_store)
            mock_mine.assert_called_once_with(mock_store)
            assert result["status"] == "skipped"