"""v0.4 — Workflow generator UI + hot-reload tests.

Covers:
1. POST /api/workflows persists a YAML under <data_dir>/workflows/
2. POST rejects malformed body with 422
3. POST rejects duplicate (name, version) with 409
4. GET /api/workflows hot-reloads when a new file appears
5. GET /api/workflows hot-reloads when an existing file is edited
6. /new-workflow.html serves with the page marker
"""

from __future__ import annotations

from collections.abc import AsyncIterator
from pathlib import Path

import pytest
import yaml
from fastapi import FastAPI
from httpx import ASGITransport, AsyncClient

from my_deepagent.api.app import create_app
from my_deepagent.config import load_config
from my_deepagent.persistence.db import Database


@pytest.fixture
async def app_client(tmp_path: Path) -> AsyncIterator[tuple[AsyncClient, FastAPI, Path]]:
    db_url = f"sqlite+aiosqlite:///{tmp_path / 'gen.sqlite3'}"
    cfg = load_config(
        workspace_root=tmp_path,
        data_dir=tmp_path / "data",
        database_url=db_url,
    )
    db = Database(db_url)
    await db.init_schema()
    await db.dispose()
    app = create_app(cfg)
    transport = ASGITransport(app=app)
    async with app.router.lifespan_context(app):
        async with AsyncClient(transport=transport, base_url="http://test", timeout=10.0) as client:
            yield (client, app, cfg.data_dir)


def _valid_body(name: str = "my-flow", version: int = 1) -> dict[str, object]:
    return {
        "name": name,
        "version": version,
        "description": "test workflow generator",
        "roles": [{"id": "writer", "required_capabilities": ["code_edit"]}],
        "phases": [
            {
                "key": "p1",
                "title": "first phase",
                "risk": "medium",
                "role": "writer",
                "instructions": "do something useful in this phase",
            }
        ],
    }


# ---------------------------------------------------------------------------
# Static page
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_new_workflow_page_served(
    app_client: tuple[AsyncClient, FastAPI, Path],
) -> None:
    client, _app, _dir = app_client
    r = await client.get("/new-workflow.html")
    assert r.status_code == 200
    assert 'data-page="new-workflow"' in r.text
    assert "워크플로우 템플릿 만들기" in r.text


# ---------------------------------------------------------------------------
# POST /api/workflows happy path
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_post_workflow_creates_yaml_under_data_dir(
    app_client: tuple[AsyncClient, FastAPI, Path],
) -> None:
    client, _app, data_dir = app_client
    r = await client.post("/api/workflows", json=_valid_body())
    assert r.status_code == 201, r.text
    body = r.json()
    target = Path(body["path"])
    assert target.is_file()
    assert target.parent == data_dir / "workflows"
    assert target.name == "my-flow@1.yaml"
    parsed = yaml.safe_load(target.read_text(encoding="utf-8"))
    assert parsed["name"] == "my-flow"
    assert parsed["version"] == 1
    assert parsed["phases"][0]["key"] == "p1"


# ---------------------------------------------------------------------------
# Validation rejection
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_post_workflow_rejects_missing_roles(
    app_client: tuple[AsyncClient, FastAPI, Path],
) -> None:
    client, _app, _dir = app_client
    bad = _valid_body()
    bad["roles"] = []  # min_length=1 violation
    r = await client.post("/api/workflows", json=bad)
    assert r.status_code == 422


@pytest.mark.asyncio
async def test_post_workflow_rejects_phase_referencing_unknown_role(
    app_client: tuple[AsyncClient, FastAPI, Path],
) -> None:
    client, _app, _dir = app_client
    bad = _valid_body()
    bad["phases"][0]["role"] = "ghost-role"  # type: ignore[index]
    r = await client.post("/api/workflows", json=bad)
    assert r.status_code == 422
    assert "ghost-role" in r.text


# ---------------------------------------------------------------------------
# Duplicate refusal
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_post_workflow_rejects_duplicate_name_version(
    app_client: tuple[AsyncClient, FastAPI, Path],
) -> None:
    client, _app, _dir = app_client
    body = _valid_body("dup-flow", 1)
    r1 = await client.post("/api/workflows", json=body)
    assert r1.status_code == 201
    r2 = await client.post("/api/workflows", json=body)
    assert r2.status_code == 409
    assert "already exists" in r2.text


# ---------------------------------------------------------------------------
# Hot-reload — new file appears in GET
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_get_workflows_hot_reloads_after_post(
    app_client: tuple[AsyncClient, FastAPI, Path],
) -> None:
    client, _app, _dir = app_client
    before = await client.get("/api/workflows")
    before_names = {w["name"] for w in before.json()}
    assert "fresh-flow" not in before_names

    r = await client.post("/api/workflows", json=_valid_body("fresh-flow", 1))
    assert r.status_code == 201

    after = await client.get("/api/workflows")
    after_names = {w["name"] for w in after.json()}
    assert "fresh-flow" in after_names


@pytest.mark.asyncio
async def test_get_workflows_hot_reloads_after_external_file_drop(
    app_client: tuple[AsyncClient, FastAPI, Path],
) -> None:
    """Even when the file is dropped directly into the dir (not via POST),
    the next GET picks it up via the mtime fingerprint."""
    from textwrap import dedent

    client, _app, data_dir = app_client
    wf_dir = data_dir / "workflows"
    wf_dir.mkdir(parents=True, exist_ok=True)
    (wf_dir / "external@1.yaml").write_text(
        dedent(
            """\
            name: external
            version: 1
            description: dropped by hand
            roles:
              - id: writer
                required_capabilities: [code_edit]
            phases:
              - key: p1
                title: only phase
                risk: low
                role: writer
                instructions: just write something to disk
            """
        ),
        encoding="utf-8",
    )
    r = await client.get("/api/workflows")
    names = {w["name"] for w in r.json()}
    assert "external" in names