"""Tests for ace steps: ReflectStep, UpdateStep, provenance."""

from __future__ import annotations

import logging
from dataclasses import dataclass
from typing import Any, Optional
from unittest.mock import MagicMock

import pytest

from ace.core.context import ACEStepContext, SkillbookView
from ace.core.outputs import (
    AgentOutput,
    ReflectorOutput,
    SkillManagerOutput,
)
from ace.core.skillbook import Skillbook, UpdateBatch, UpdateOperation
from ace.steps import learning_tail
from ace.steps.reflect import ReflectStep
from ace.steps.update import UpdateStep

# ------------------------------------------------------------------ #
# Helpers — mock roles satisfying protocols
# ------------------------------------------------------------------ #


class MockReflector:
    """Minimal mock satisfying ReflectorLike."""

    def __init__(self, output: ReflectorOutput | None = None):
        self.output = output or ReflectorOutput(
            reasoning="test reasoning",
            correct_approach="test approach",
            key_insight="test insight",
        )
        self.calls: list[dict] = []

    def reflect(
        self,
        *,
        question: str,
        agent_output: AgentOutput,
        skillbook: Any,
        ground_truth: Optional[str] = None,
        feedback: Optional[str] = None,
        **kwargs: Any,
    ) -> ReflectorOutput:
        self.calls.append(
            {
                "question": question,
                "agent_output": agent_output,
                "ground_truth": ground_truth,
                "feedback": feedback,
                **kwargs,
            }
        )
        return self.output


class MockSkillManager:
    """Minimal mock satisfying SkillManagerLike."""

    def __init__(self, output: SkillManagerOutput | None = None):
        self.output = output or SkillManagerOutput(
            update=UpdateBatch(reasoning="test", operations=[]),
        )
        self.calls: list[dict] = []

    def update_skills(
        self,
        *,
        reflections: tuple[ReflectorOutput, ...],
        skillbook: Any,
        question_context: str,
        progress: str,
        **kwargs: Any,
    ) -> SkillManagerOutput:
        self.calls.append(
            {
                "reflections": reflections,
                "question_context": question_context,
                "progress": progress,
            }
        )
        return self.output


# ------------------------------------------------------------------ #
# ReflectStep
# ------------------------------------------------------------------ #


class TestReflectStep:
    def test_dict_trace(self):
        """Structured dict trace should extract known fields."""
        reflector = MockReflector()
        step = ReflectStep(reflector)

        trace = {
            "question": "What is 2+2?",
            "answer": "4",
            "reasoning": "simple math",
            "ground_truth": "4",
            "feedback": "Correct!",
        }
        sb = Skillbook()
        ctx = ACEStepContext(
            trace=trace,
            skillbook=SkillbookView(sb),
        )

        result = step(ctx)
        assert len(result.reflections) == 1
        assert len(reflector.calls) == 1
        call = reflector.calls[0]
        assert call["question"] == "What is 2+2?"
        assert call["agent_output"].final_answer == "4"
        assert call["ground_truth"] == "4"
        assert call["feedback"] == "Correct!"

    def test_raw_trace(self):
        """Non-dict trace should be passed as-is via kwargs."""
        reflector = MockReflector()
        step = ReflectStep(reflector)

        raw_trace = ["step1", "step2", "step3"]
        sb = Skillbook()
        ctx = ACEStepContext(
            trace=raw_trace,
            skillbook=SkillbookView(sb),
        )

        result = step(ctx)
        assert len(result.reflections) == 1
        assert len(reflector.calls) == 1
        call = reflector.calls[0]
        assert call["question"] == ""
        assert call["agent_output"].final_answer == ""
        assert call.get("trace") is raw_trace

    def test_batch_dict_trace_is_passed_raw(self):
        """Batch dict traces should bypass structured trace extraction."""
        reflector = MockReflector()
        step = ReflectStep(reflector)

        batch_trace = {
            "tasks": [
                {"task_id": "task-0", "trace": {"question": "What is 2+2?"}},
                {"task_id": "task-1", "trace": {"question": "What is 3+3?"}},
            ]
        }
        sb = Skillbook()
        ctx = ACEStepContext(
            trace=batch_trace,
            skillbook=SkillbookView(sb),
        )

        result = step(ctx)
        assert len(result.reflections) == 1
        assert len(reflector.calls) == 1
        call = reflector.calls[0]
        assert call["question"] == ""
        assert call["agent_output"].final_answer == ""
        assert call.get("trace") is batch_trace

    def test_provides_and_requires(self):
        step = ReflectStep(MockReflector())
        assert "trace" in step.requires
        assert "skillbook" in step.requires
        assert "reflections" in step.provides
        assert step.async_boundary is True
        assert step.max_workers == 3


# ------------------------------------------------------------------ #
# UpdateStep
# ------------------------------------------------------------------ #


class TestUpdateStep:
    def test_generates_update_batch(self):
        sm = MockSkillManager()
        sb = Skillbook()
        step = UpdateStep(sm, sb)

        reflection = ReflectorOutput(
            reasoning="r",
            correct_approach="c",
            key_insight="k",
        )
        trace = {"question": "What is 2+2?", "context": "math quiz"}
        ctx = ACEStepContext(
            reflections=(reflection,),
            skillbook=SkillbookView(sb),
            trace=trace,
            epoch=2,
            total_epochs=3,
            step_index=5,
            total_steps=10,
        )

        result = step(ctx)
        assert result.skill_manager_output is not None
        assert len(sm.calls) == 1
        call = sm.calls[0]
        assert "Epoch 2/3" in call["progress"]
        assert "sample 5/10" in call["progress"]
        assert "What is 2+2?" in call["question_context"]

    def test_non_dict_trace(self):
        """Non-dict trace should produce empty question_context."""
        sm = MockSkillManager()
        sb = Skillbook()
        step = UpdateStep(sm, sb)

        reflection = ReflectorOutput(
            reasoning="r",
            correct_approach="c",
            key_insight="k",
        )
        ctx = ACEStepContext(
            reflections=(reflection,),
            skillbook=SkillbookView(sb),
            trace="raw string trace",
        )

        step(ctx)
        assert sm.calls[0]["question_context"] == ""

    def test_forwards_full_reflections_tuple(self):
        """UpdateStep forwards the entire reflections tuple to the skill manager."""
        sm = MockSkillManager()
        sb = Skillbook()
        step = UpdateStep(sm, sb)

        r1 = ReflectorOutput(reasoning="r1", correct_approach="c", key_insight="k1")
        r2 = ReflectorOutput(reasoning="r2", correct_approach="c", key_insight="k2")
        ctx = ACEStepContext(
            reflections=(r1, r2),
            skillbook=SkillbookView(sb),
        )

        step(ctx)
        assert len(sm.calls) == 1
        assert sm.calls[0]["reflections"] == (r1, r2)

    def test_provides_and_requires(self):
        sb = Skillbook()
        step = UpdateStep(MockSkillManager(), sb)
        assert "reflections" in step.requires
        assert "skillbook" in step.requires
        assert "skill_manager_output" in step.provides
        assert step.max_workers == 1


# ------------------------------------------------------------------ #
# learning_tail helper
# ------------------------------------------------------------------ #


class TestLearningTail:
    def test_basic_tail(self):
        reflector = MockReflector()
        sm = MockSkillManager()
        sb = Skillbook()

        steps = learning_tail(reflector, sm, sb)
        assert len(steps) == 2
        assert isinstance(steps[0], ReflectStep)
        assert isinstance(steps[1], UpdateStep)

    def test_step_like_reflector_is_inserted_directly(self):
        class ReflectorStep(MockReflector):
            requires = frozenset({"trace", "skillbook"})
            provides = frozenset({"reflections"})

            def __call__(self, ctx: ACEStepContext) -> ACEStepContext:
                return ctx.replace(reflections=(self.output,))

        reflector = ReflectorStep()
        sm = MockSkillManager()
        sb = Skillbook()

        steps = learning_tail(reflector, sm, sb)

        assert steps[0] is reflector
        assert isinstance(steps[1], UpdateStep)

    def test_with_checkpoint(self, tmp_path):
        reflector = MockReflector()
        sm = MockSkillManager()
        sb = Skillbook()

        steps = learning_tail(
            reflector,
            sm,
            sb,
            checkpoint_dir=str(tmp_path),
            checkpoint_interval=5,
        )
        assert len(steps) == 3  # 2 + CheckpointStep

    def test_with_dedup(self):
        reflector = MockReflector()
        sm = MockSkillManager()
        sb = Skillbook()
        dedup = MagicMock()

        steps = learning_tail(
            reflector,
            sm,
            sb,
            dedup_manager=dedup,
            dedup_interval=5,
        )
        assert len(steps) == 3  # 2 + DeduplicateStep

    def test_with_both(self, tmp_path):
        reflector = MockReflector()
        sm = MockSkillManager()
        sb = Skillbook()
        dedup = MagicMock()

        steps = learning_tail(
            reflector,
            sm,
            sb,
            dedup_manager=dedup,
            dedup_interval=5,
            checkpoint_dir=str(tmp_path),
            checkpoint_interval=5,
        )
        assert len(steps) == 4  # 2 + DeduplicateStep + CheckpointStep