"""T050: Integration tests for finetune router endpoints."""
import pytest
from unittest.mock import MagicMock, patch

from app.core.exceptions import LLMCallError
from app.models.finetune_models import FinetuneStartResponse, FinetuneStatusResponse


# ---------------------------------------------------------------------------
# POST /api/v1/finetune/start
# ---------------------------------------------------------------------------

def test_finetune_start_returns_200_with_job_id(client):
    start_resp = FinetuneStartResponse(job_id="glm-ft-router-test")

    with patch("app.routers.finetune.finetune_service.submit_finetune") as mock_submit:
        mock_submit.return_value = start_resp

        resp = client.post(
            "/api/v1/finetune/start",
            json={
                "jsonl_url": "s3://bucket/train.jsonl",
                "base_model": "glm-4",
                "hyperparams": {"n_epochs": 3},
            },
        )

    assert resp.status_code == 200
    data = resp.json()
    assert data["job_id"] == "glm-ft-router-test"


def test_finetune_start_without_hyperparams(client):
    start_resp = FinetuneStartResponse(job_id="glm-ft-nohp")

    with patch("app.routers.finetune.finetune_service.submit_finetune") as mock_submit:
        mock_submit.return_value = start_resp

        resp = client.post(
            "/api/v1/finetune/start",
            json={
                "jsonl_url": "s3://bucket/train.jsonl",
                "base_model": "glm-4",
            },
        )

    assert resp.status_code == 200
    assert resp.json()["job_id"] == "glm-ft-nohp"


def test_finetune_start_llm_call_error_returns_503(client):
    with patch("app.routers.finetune.finetune_service.submit_finetune") as mock_submit:
        mock_submit.side_effect = LLMCallError("SDK failed")

        resp = client.post(
            "/api/v1/finetune/start",
            json={
                "jsonl_url": "s3://bucket/train.jsonl",
                "base_model": "glm-4",
            },
        )

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


# ---------------------------------------------------------------------------
# GET /api/v1/finetune/status/{job_id}
# ---------------------------------------------------------------------------

def test_finetune_status_returns_200_with_fields(client):
    status_resp = FinetuneStatusResponse(
        job_id="glm-ft-router-test",
        status="RUNNING",
        progress=30,
    )

    with patch("app.routers.finetune.finetune_service.get_finetune_status") as mock_status:
        mock_status.return_value = status_resp

        resp = client.get("/api/v1/finetune/status/glm-ft-router-test")

    assert resp.status_code == 200
    data = resp.json()
    assert data["job_id"] == "glm-ft-router-test"
    assert data["status"] == "RUNNING"
    assert data["progress"] == 30


def test_finetune_status_succeeded(client):
    status_resp = FinetuneStatusResponse(
        job_id="glm-ft-done",
        status="SUCCESS",
    )

    with patch("app.routers.finetune.finetune_service.get_finetune_status") as mock_status:
        mock_status.return_value = status_resp

        resp = client.get("/api/v1/finetune/status/glm-ft-done")

    assert resp.status_code == 200
    assert resp.json()["status"] == "SUCCESS"


def test_finetune_status_llm_call_error_returns_503(client):
    with patch("app.routers.finetune.finetune_service.get_finetune_status") as mock_status:
        mock_status.side_effect = LLMCallError("SDK failed")

        resp = client.get("/api/v1/finetune/status/glm-ft-bad")

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