import os
from pathlib import Path

from l4d2web.db import init_db, session_scope
from l4d2web.models import GlobalOverlayItem, GlobalOverlayItemFile, GlobalOverlaySource, Overlay
from l4d2web.services.overlay_builders import BUILDERS


def seed_source(tmp_path: Path, monkeypatch) -> int:
    monkeypatch.setenv("DATABASE_URL", f"sqlite:///{tmp_path/'builder.db'}")
    monkeypatch.setenv("LEFT4ME_ROOT", str(tmp_path))
    init_db()
    cache_vpk = tmp_path / "global_overlay_cache" / "l4d2center-maps" / "vpks" / "carriedoff.vpk"
    cache_vpk.parent.mkdir(parents=True, exist_ok=True)
    cache_vpk.write_bytes(b"vpk")
    with session_scope() as db:
        overlay = Overlay(name="l4d2center-maps", path="7", type="l4d2center_maps", user_id=None)
        db.add(overlay)
        db.flush()
        source = GlobalOverlaySource(
            overlay_id=overlay.id,
            source_key="l4d2center-maps",
            source_type="l4d2center_csv",
            source_url="https://l4d2center.com/maps/servers/index.csv",
        )
        db.add(source)
        db.flush()
        item = GlobalOverlayItem(
            source_id=source.id,
            item_key="carriedoff.vpk",
            display_name="carriedoff.vpk",
            download_url="https://example.invalid/carriedoff.7z",
            expected_vpk_name="carriedoff.vpk",
        )
        db.add(item)
        db.flush()
        db.add(
            GlobalOverlayItemFile(
                item_id=item.id,
                vpk_name="carriedoff.vpk",
                cache_path="l4d2center-maps/vpks/carriedoff.vpk",
                size=3,
                md5="",
            )
        )
        db.flush()
        return overlay.id


def test_registry_contains_global_map_builders():
    assert "l4d2center_maps" in BUILDERS
    assert "cedapug_maps" in BUILDERS


def test_global_builder_creates_absolute_symlink(tmp_path, monkeypatch):
    overlay_id = seed_source(tmp_path, monkeypatch)
    out: list[str] = []
    err: list[str] = []
    with session_scope() as db:
        overlay = db.query(Overlay).filter_by(id=overlay_id).one()
        BUILDERS["l4d2center_maps"].build(overlay, on_stdout=out.append, on_stderr=err.append, should_cancel=lambda: False)

    link = tmp_path / "overlays" / "7" / "left4dead2" / "addons" / "carriedoff.vpk"
    assert link.is_symlink()
    assert os.path.isabs(os.readlink(link))
    assert link.resolve() == (tmp_path / "global_overlay_cache" / "l4d2center-maps" / "vpks" / "carriedoff.vpk").resolve()
    assert any("global overlay" in line for line in out)


def test_global_builder_removes_obsolete_managed_symlink_but_keeps_foreign(tmp_path, monkeypatch):
    overlay_id = seed_source(tmp_path, monkeypatch)
    addons = tmp_path / "overlays" / "7" / "left4dead2" / "addons"
    addons.mkdir(parents=True, exist_ok=True)
    foreign_target = tmp_path / "foreign.vpk"
    foreign_target.write_bytes(b"foreign")
    os.symlink(str(foreign_target), addons / "foreign.vpk")

    with session_scope() as db:
        overlay = db.query(Overlay).filter_by(id=overlay_id).one()
        BUILDERS["l4d2center_maps"].build(overlay, on_stdout=lambda line: None, on_stderr=lambda line: None, should_cancel=lambda: False)
        source = db.query(GlobalOverlaySource).filter_by(source_key="l4d2center-maps").one()
        db.query(GlobalOverlayItem).filter_by(source_id=source.id).delete()

    with session_scope() as db:
        overlay = db.query(Overlay).filter_by(id=overlay_id).one()
        BUILDERS["l4d2center_maps"].build(overlay, on_stdout=lambda line: None, on_stderr=lambda line: None, should_cancel=lambda: False)

    assert not (addons / "carriedoff.vpk").exists()
    assert (addons / "foreign.vpk").is_symlink()