import json
import sys
from pathlib import Path

import pytest


BACKEND_DIR = Path(__file__).resolve().parents[1]
if str(BACKEND_DIR) not in sys.path:
    sys.path.insert(0, str(BACKEND_DIR))

from fastapi import HTTPException  # noqa: E402
from service import app  # noqa: E402


SVG = '<svg xmlns="http://www.w3.org/2000/svg" width="20" height="10"/>'
ASSET_ID = "asset_deleteprotected000000000000000000"


@pytest.fixture
def isolated_storage(tmp_path, monkeypatch):
    assets_dir = tmp_path / "service_assets"
    templates_dir = tmp_path / "service_design_templates"
    projects_dir = tmp_path / "service_projects"
    for directory in (assets_dir, templates_dir, projects_dir):
        directory.mkdir()
    monkeypatch.setattr(app, "ASSETS_DIR", assets_dir)
    monkeypatch.setattr(app, "DESIGN_TEMPLATES_DIR", templates_dir)
    monkeypatch.setattr(app, "PROJECTS_DIR", projects_dir)
    return assets_dir


def create_sticker_asset(assets_dir, asset_id=ASSET_ID):
    asset_dir = assets_dir / asset_id[:2] / asset_id
    asset_dir.mkdir(parents=True)
    (asset_dir / "asset.svg").write_text(SVG, encoding="utf-8")
    (asset_dir / "meta.json").write_text(
        json.dumps(
            {
                "asset_id": asset_id,
                "name": "protected sticker",
                "type": "sticker",
                "mime_type": "image/svg+xml",
            }
        ),
        encoding="utf-8",
    )


def test_delete_asset_blocks_design_template_reference(isolated_storage):
    create_sticker_asset(isolated_storage)
    templates_dir = isolated_storage.parent / "service_design_templates"
    template_dir = templates_dir / "tm" / "tmpl_test"
    template_dir.mkdir(parents=True)
    (template_dir / "template.json").write_text(
        json.dumps(
            {
                "template_id": "tmpl_test",
                "name": "TEST模板",
                "document": {"elements": [{"type": "sticker", "assetId": ASSET_ID}]},
            }
        ),
        encoding="utf-8",
    )

    with pytest.raises(HTTPException) as excinfo:
        app.delete_asset(ASSET_ID)

    assert excinfo.value.status_code == 409
    assert "TEST模板" in str(excinfo.value.detail)
    assert (isolated_storage / ASSET_ID[:2] / ASSET_ID / "meta.json").exists()


def test_delete_asset_blocks_project_reference(isolated_storage):
    create_sticker_asset(isolated_storage)
    projects_dir = isolated_storage.parent / "service_projects"
    project_dir = projects_dir / "pr" / "proj_test"
    project_dir.mkdir(parents=True)
    (project_dir / "project.json").write_text(
        json.dumps(
            {
                "project_id": "proj_test",
                "name": "生产项目",
                "stickers": [{"assetId": ASSET_ID}],
            }
        ),
        encoding="utf-8",
    )

    with pytest.raises(HTTPException) as excinfo:
        app.delete_asset(ASSET_ID)

    assert excinfo.value.status_code == 409
    assert "生产项目" in str(excinfo.value.detail)


def test_delete_asset_allows_unreferenced_sticker(isolated_storage):
    create_sticker_asset(isolated_storage)

    app.delete_asset(ASSET_ID)

    assert not (isolated_storage / ASSET_ID[:2] / ASSET_ID).exists()