"""A platform that inherits another one.

The child was merged over the parent's cached config: its overrides rewrote
the parent's systems for the rest of the run, and the parent's registry
fields hid the child's own, so RetroPie loaded as active with RetroArch's
scraper and install block.
"""

from __future__ import annotations

import shutil
import sys
import tempfile
import unittest
from pathlib import Path

import yaml

REPO_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(REPO_ROOT / "scripts"))

import common  # noqa: E402


class AChildLeavesItsParentAlone(unittest.TestCase):
    def setUp(self):
        self.dir = Path(tempfile.mkdtemp(dir=REPO_ROOT / "tmp"))
        self.addCleanup(shutil.rmtree, self.dir, True)
        self.addCleanup(common._platform_config_cache.clear)
        self.addCleanup(common._shared_yml_cache.clear)
        files = {
            "parent.yml": {"platform": "Parent", "verification_mode": "existence",
                           "systems": {"sys-a": {"files": [{"name": "a.bin"}]}}},
            "child.yml": {"platform": "Child", "inherits": "parent", "overrides": {
                "systems": {"sys-a": {"files": [{"name": "child.bin"}]},
                            "sys-new": {"files": [{"name": "new.bin"}]}}}},
            "_registry.yml": {"platforms": {
                "parent": {"status": "active", "scraper": "parent", "hash_type": "md5",
                           "cores": "all_libretro"},
                "child": {"status": "archived", "scraper": "child"},
            }},
        }
        for name, data in files.items():
            (self.dir / name).write_text(yaml.safe_dump(data))

    def load(self, name):
        return common.load_platform_config(name, str(self.dir))

    def test_the_parent_keeps_its_systems(self):
        self.load("parent")
        self.load("child")
        parent = self.load("parent")
        self.assertEqual(list(parent["systems"]), ["sys-a"])
        self.assertEqual(parent["systems"]["sys-a"]["files"], [{"name": "a.bin"}])

    def test_the_child_reads_its_own_registry_entry_first(self):
        self.load("parent")
        child = self.load("child")
        self.assertEqual((child["status"], child["scraper"]), ("archived", "child"))
        # What it does not say comes from its parent's entry.
        self.assertEqual((child["hash_type"], child["cores"]), ("md5", "all_libretro"))
        self.assertEqual(child["systems"]["sys-a"]["files"], [{"name": "child.bin"}])


if __name__ == "__main__":
    unittest.main()