"""Tests for QA router: /api/v1/qa/gen-text and /api/v1/qa/gen-image."""
import json
import pytest
from unittest.mock import AsyncMock

from app.core.exceptions import LLMCallError, LLMParseError, StorageError


SAMPLE_QA_JSON = json.dumps([
    {"question": "电缆接头位于哪里？", "answer": "配电箱左侧"},
])

FAKE_IMAGE_BYTES = b"\xff\xd8\xff\xe0fake_jpeg_content"

TEXT_QA_PAYLOAD = {
    "items": [
        {
            "subject": "电缆接头",
            "predicate": "位于",
            "object": "配电箱左侧",
            "source_snippet": "电缆接头位于配电箱左侧",
        }
    ]
}

IMAGE_QA_PAYLOAD = {
    "items": [
        {
            "subject": "电缆接头",
            "predicate": "位于",
            "object": "配电箱左侧",
            "cropped_image_path": "crops/1/0.jpg",
        }
    ]
}


# ---------------------------------------------------------------------------
# POST /api/v1/qa/gen-text
# ---------------------------------------------------------------------------


def test_gen_text_qa_returns_200(client, mock_llm):
    mock_llm.chat = AsyncMock(return_value=SAMPLE_QA_JSON)

    resp = client.post("/api/v1/qa/gen-text", json=TEXT_QA_PAYLOAD)

    assert resp.status_code == 200
    data = resp.json()
    assert "pairs" in data
    assert len(data["pairs"]) == 1
    assert data["pairs"][0]["question"] == "电缆接头位于哪里？"
    assert data["pairs"][0]["answer"] == "配电箱左侧"


def test_gen_text_qa_llm_parse_error_returns_502(client, mock_llm):
    mock_llm.chat = AsyncMock(return_value="not valid json {{")

    resp = client.post("/api/v1/qa/gen-text", json=TEXT_QA_PAYLOAD)

    assert resp.status_code == 502
    assert resp.json()["code"] == "LLM_PARSE_ERROR"


def test_gen_text_qa_llm_call_error_returns_503(client, mock_llm):
    mock_llm.chat = AsyncMock(side_effect=LLMCallError("GLM timeout"))

    resp = client.post("/api/v1/qa/gen-text", json=TEXT_QA_PAYLOAD)

    assert resp.status_code == 503
    assert resp.json()["code"] == "LLM_CALL_ERROR"


# ---------------------------------------------------------------------------
# POST /api/v1/qa/gen-image
# ---------------------------------------------------------------------------


def test_gen_image_qa_returns_200(client, mock_llm, mock_storage):
    mock_storage.download_bytes = AsyncMock(return_value=FAKE_IMAGE_BYTES)
    mock_llm.chat_vision = AsyncMock(return_value=SAMPLE_QA_JSON)

    resp = client.post("/api/v1/qa/gen-image", json=IMAGE_QA_PAYLOAD)

    assert resp.status_code == 200
    data = resp.json()
    assert "pairs" in data
    assert len(data["pairs"]) == 1
    pair = data["pairs"][0]
    assert pair["question"] == "电缆接头位于哪里？"
    assert pair["answer"] == "配电箱左侧"
    assert pair["image_path"] == "crops/1/0.jpg"


def test_gen_image_qa_llm_parse_error_returns_502(client, mock_llm, mock_storage):
    mock_storage.download_bytes = AsyncMock(return_value=FAKE_IMAGE_BYTES)
    mock_llm.chat_vision = AsyncMock(return_value="bad json {{")

    resp = client.post("/api/v1/qa/gen-image", json=IMAGE_QA_PAYLOAD)

    assert resp.status_code == 502
    assert resp.json()["code"] == "LLM_PARSE_ERROR"


def test_gen_image_qa_llm_call_error_returns_503(client, mock_llm, mock_storage):
    mock_storage.download_bytes = AsyncMock(return_value=FAKE_IMAGE_BYTES)
    mock_llm.chat_vision = AsyncMock(side_effect=LLMCallError("GLM vision timeout"))

    resp = client.post("/api/v1/qa/gen-image", json=IMAGE_QA_PAYLOAD)

    assert resp.status_code == 503
    assert resp.json()["code"] == "LLM_CALL_ERROR"


def test_gen_image_qa_storage_error_returns_502(client, mock_storage):
    mock_storage.download_bytes = AsyncMock(side_effect=StorageError("RustFS down"))

    resp = client.post("/api/v1/qa/gen-image", json=IMAGE_QA_PAYLOAD)

    assert resp.status_code == 502
    assert resp.json()["code"] == "STORAGE_ERROR"