import json
import shutil
from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from app import app, PIPELINES_DIR, LOGS_DIR

BASE_DIR = Path(__file__).parent.parent

@pytest.fixture(autouse=True)
def clean_storage():
    """Clean storage before and after each test."""
    if PIPELINES_DIR.exists():
        shutil.rmtree(PIPELINES_DIR)
    if LOGS_DIR.exists():
        shutil.rmtree(LOGS_DIR)
    PIPELINES_DIR.mkdir(parents=True, exist_ok=True)
    LOGS_DIR.mkdir(parents=True, exist_ok=True)
    yield
    if PIPELINES_DIR.exists():
        shutil.rmtree(PIPELINES_DIR)
    if LOGS_DIR.exists():
        shutil.rmtree(LOGS_DIR)

def make_pipeline(name="test", prompt_count=1):
    return {
        "id": "test-pipeline-id",
        "name": name,
        "prompts": [
            {
                "id": f"prompt-{i}",
                "text": f"test prompt {i}",
                "title": f"Test Prompt {i}",
                "order": i
            }
            for i in range(prompt_count)
        ],
        "created_at": "2024-01-01T00:00:00+00:00",
        "updated_at": "2024-01-01T00:00:00+00:00"
    }

@pytest.fixture
def client():
    return TestClient(app)

class TestListPipelines:
    def test_empty(self, client):
        resp = client.get("/api/pipelines")
        assert resp.status_code == 200
        assert resp.json() == []

    def test_with_pipelines(self, client):
        p = make_pipeline()
        client.post("/api/pipelines", json=p)
        resp = client.get("/api/pipelines")
        assert resp.status_code == 200
        data = resp.json()
        assert len(data) == 1
        assert data[0]["name"] == "test"

class TestCreatePipeline:
    def test_create(self, client):
        p = make_pipeline()
        resp = client.post("/api/pipelines", json=p)
        assert resp.status_code == 200
        data = resp.json()
        assert data["name"] == "test"
        assert data["id"] == "test-pipeline-id"

    def test_duplicate_id(self, client):
        p = make_pipeline()
        client.post("/api/pipelines", json=p)
        resp = client.post("/api/pipelines", json=p)
        assert resp.status_code == 409

class TestDeletePipeline:
    def test_delete(self, client):
        p = make_pipeline()
        client.post("/api/pipelines", json=p)
        resp = client.delete("/api/pipelines/test-pipeline-id")
        assert resp.status_code == 200
        assert resp.json()["deleted"] == "test-pipeline-id"

    def test_delete_not_found(self, client):
        resp = client.delete("/api/pipelines/nonexistent")
        assert resp.status_code == 404

class TestExecutePipeline:
    def test_not_found(self, client):
        resp = client.post("/api/pipelines/nonexistent/execute")
        assert resp.status_code == 404

    def test_execute(self, client, monkeypatch):
        """Test pipeline execution by patching opencode with echo."""
        import asyncio

        class FakeStream:
            async def readline(self):
                return b""

        class FakeProcess:
            returncode = 0

            async def wait(self):
                return 0

        async def fake_create_subprocess_exec(*args, **kwargs):
            proc = FakeProcess()
            proc.stdout = FakeStream()
            proc.stderr = FakeStream()
            return proc

        monkeypatch.setattr(asyncio, "create_subprocess_exec", fake_create_subprocess_exec)

        p = make_pipeline()
        client.post("/api/pipelines", json=p)

        resp = client.post("/api/pipelines/test-pipeline-id/execute")
        assert resp.status_code == 200
        data = resp.json()
        assert "run_id" in data
        assert "log_file" in data

    def test_log_file_created(self, client, monkeypatch):
        """Test that log file is created after execution."""
        import asyncio

        class FakeStream:
            async def readline(self):
                return b""

        class FakeProcess:
            returncode = 0

            async def wait(self):
                return 0

        async def fake_create_subprocess_exec(*args, **kwargs):
            proc = FakeProcess()
            proc.stdout = FakeStream()
            proc.stderr = FakeStream()
            return proc

        monkeypatch.setattr(asyncio, "create_subprocess_exec", fake_create_subprocess_exec)

        p = make_pipeline()
        client.post("/api/pipelines", json=p)

        resp = client.post("/api/pipelines/test-pipeline-id/execute")
        data = resp.json()
        log_path = Path(data["log_file"])
        assert log_path.exists()
        content = log_path.read_text()
        assert "Starting pipeline" in content
        assert "Pipeline finished" in content

    def test_error_step_stops_pipeline(self, client, monkeypatch):
        """Test that pipeline stops on first error."""
        import asyncio

        class FakeStream:
            async def readline(self):
                return b""

        class FakeProcess:
            returncode = 1

            async def wait(self):
                return 1

        async def fake_create_subprocess_exec(*args, **kwargs):
            proc = FakeProcess()
            proc.stdout = FakeStream()
            proc.stderr = FakeStream()
            return proc

        monkeypatch.setattr(asyncio, "create_subprocess_exec", fake_create_subprocess_exec)

        p = make_pipeline(prompt_count=3)
        client.post("/api/pipelines", json=p)

        resp = client.post("/api/pipelines/test-pipeline-id/execute")
        data = resp.json()
        log_path = Path(data["log_file"])
        content = log_path.read_text()
        assert "Pipeline failed at step 1" in content
        assert "Step 2" not in content