from __future__ import annotations

from fastapi.testclient import TestClient
import pytest

from models import (
    ActionType,
    IssueType,
    PythonReviewAction,
    Severity,
)
from server.app import app
from server.grading import grade_review
from server.python_env_environment import PythonEnvironment
from server.task_bank import load_task_bank


def _snippet_by_id(task_id: str, snippet_id: str):
    return next(item for item in load_task_bank()[task_id] if item.snippet_id == snippet_id)


def test_add_comment_requires_fields() -> None:
    with pytest.raises(Exception):
        PythonReviewAction(action_type=ActionType.ADD_COMMENT)


def test_approve_rejects_extra_fields() -> None:
    with pytest.raises(Exception):
        PythonReviewAction(
            action_type=ActionType.APPROVE,
            comment="looks good",
        )


def test_easy_grader_rewards_required_issue_and_request_changes() -> None:
    snippet = load_task_bank()["task_easy"][0]
    history = [
        PythonReviewAction(
            action_type=ActionType.ADD_COMMENT,
            line_number=4,
            issue_type=IssueType.STYLE,
            severity=Severity.LOW,
            comment="Ambiguous variable name l violates PEP8 E741.",
        ),
        PythonReviewAction(action_type=ActionType.REQUEST_CHANGES),
    ]
    comments = []
    for step, action in enumerate(history, start=1):
        comments.append(
            {
                "step_index": step,
                "action_type": action.action_type,
                "line_number": action.line_number,
                "issue_type": action.issue_type,
                "severity": action.severity,
                "comment": action.comment,
            }
        )
    from models import ReviewComment

    result = grade_review(
        "task_easy",
        snippet,
        [ReviewComment.model_validate(item) for item in comments],
        duplicate_comments=0,
    )
    assert result.score > 0.35
    assert result.required_found >= 1


def test_hard_grader_rewards_security_metadata() -> None:
    snippet = load_task_bank()["task_hard"][0]
    from models import ReviewComment

    review = ReviewComment(
        step_index=1,
        action_type=ActionType.ADD_COMMENT,
        line_number=2,
        issue_type=IssueType.SECURITY,
        severity=Severity.CRITICAL,
        comment="SQL injection risk. This is an OWASP injection issue because the query interpolates user input.",
        suggestion="Use a parameterized query with placeholders instead of string interpolation.",
    )
    result = grade_review("task_hard", snippet, [review], duplicate_comments=0)
    assert result.score > 0.30
    assert result.true_positives == 1


def test_environment_step_updates_metrics() -> None:
    env = PythonEnvironment()
    observation = env.reset(task_id="task_easy").model_copy()
    snippet = _snippet_by_id("task_easy", observation.snippet_id)
    issue = next(item for item in snippet.gold_issues if item.required)

    next_observation = env.step(
        PythonReviewAction(
            action_type=ActionType.ADD_COMMENT,
            line_number=issue.line,
            issue_type=issue.issue_type,
            severity=issue.severity,
            comment=issue.description,
        )
    )

    assert next_observation.reward is not None
    assert next_observation.metrics.true_positives >= 1
    assert next_observation.review_history[-1].matched_issue_ids


def test_environment_terminal_action_sets_done() -> None:
    env = PythonEnvironment()
    observation = env.reset(task_id="task_easy")
    result = env.step(PythonReviewAction(action_type=ActionType.REQUEST_CHANGES))
    assert result.done is True
    assert result.metrics.current_score >= 0.0


def test_api_smoke_endpoints() -> None:
    client = TestClient(app)

    reset_response = client.post("/reset", json={"task_id": "task_easy"})
    assert reset_response.status_code == 200
    payload = reset_response.json()
    assert payload["observation"]["task_id"] == "task_easy"
    snippet = _snippet_by_id("task_easy", payload["observation"]["snippet_id"])
    issue = next(item for item in snippet.gold_issues if item.required)

    step_response = client.post(
        "/step",
        json={
            "action": {
                "action_type": "ADD_COMMENT",
                "line_number": issue.line,
                "issue_type": issue.issue_type.value,
                "severity": issue.severity.value,
                "comment": issue.description,
            }
        },
    )
    assert step_response.status_code == 200
    assert step_response.json()["observation"]["metrics"]["true_positives"] >= 1

    tasks_response = client.get("/tasks")
    assert tasks_response.status_code == 200
    assert len(tasks_response.json()["tasks"]) == 3

    metrics_response = client.get("/metrics")
    assert metrics_response.status_code == 200
    assert "metrics" in metrics_response.json()

    health_response = client.get("/health")
    assert health_response.status_code == 200
    assert health_response.json()["status"] == "ok"

    schema_response = client.get("/schema")
    assert schema_response.status_code == 200
    assert "action" in schema_response.json()