"""A file's readers are the entries that resolve to it, not those sharing its name.

The site joined database files to emulators and platforms by bare name. The
collection holds the pak0.pk3 of Quake III and of Enemy Territory, and each page
named every engine that reads a pak0.pk3 as a reader of both, which is the
homonym tests/test_game_data_homonyms.py forbids the resolver to serve.
"""

from __future__ import annotations

import hashlib
import sys
import tempfile
import unittest
from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parent.parent
sys.path.insert(0, str(REPO_ROOT / "scripts"))

from cross_reference import FileConsumers  # noqa: E402
from generate_site import generate_system_page  # noqa: E402

_TMP = tempfile.TemporaryDirectory()
_ROOT = Path(_TMP.name)


def _collected(rel: str, payload: bytes) -> tuple[str, dict]:
    path = _ROOT / rel
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_bytes(payload)
    sha1 = hashlib.sha1(payload).hexdigest()
    return sha1, {"name": path.name, "sha1": sha1, "path": str(path),
                  "md5": hashlib.md5(payload).hexdigest(), "size": len(payload)}


Q3, _q3 = _collected("bios/id/Quake III/baseq3/pak0.pk3", b"quake iii demo")
ET, _et = _collected("bios/id/ET/etmain/pak0.pk3", b"enemy territory")
DB = {
    "files": {Q3: _q3, ET: _et},
    "indexes": {
        "by_name": {"pak0.pk3": [Q3, ET]},
        "by_md5": {_q3["md5"]: Q3, _et["md5"]: ET},
        "by_path_suffix": {
            "baseq3/pak0.pk3": [Q3], "Quake III/baseq3/pak0.pk3": [Q3],
            "etmain/pak0.pk3": [ET], "ET/etmain/pak0.pk3": [ET],
        },
    },
}
PROFILES = {
    "ioquake3": {"type": "standalone", "files": [
        {"name": "pak0.pk3", "path": "baseq3/pak0.pk3", "sha1": Q3}]},
    "etlegacy": {"type": "standalone", "files": [
        {"name": "pak0.pk3", "path": "etmain/pak0.pk3", "sha1": ET}]},
    "named_only": {"type": "standalone", "files": [
        {"name": "pak0.pk3", "path": "baseq3/pak0.pk3", "sha1": "3" * 40}]},
}


class ReadersResolve(unittest.TestCase):
    def setUp(self):
        self.consumers = FileConsumers(DB)
        self.consumers.add_emulators(PROFILES)
        self.consumers.add_platforms({
            "plat": {"systems": {"s": {"files": [
                {"name": "pak0.pk3", "destination": "etmain/pak0.pk3", "sha1": ET},
            ]}}},
        })

    def test_each_file_has_its_own_readers(self):
        self.assertEqual(self.consumers.emulators[Q3], {"ioquake3"})
        self.assertEqual(self.consumers.emulators[ET], {"etlegacy"})
        self.assertNotIn(Q3, self.consumers.platforms)
        self.assertEqual(self.consumers.platforms[ET], {"plat"})

    def test_the_system_page_names_them(self):
        consoles = {"Quake III": [DB["files"][Q3]], "ET": [DB["files"][ET]]}
        page = generate_system_page("id", consoles, self.consumers)
        q3 = page[page.index("## Quake III"):]
        et = page[page.index("## ET"):page.index("## Quake III")]
        self.assertIn("ioquake3", q3)
        self.assertNotIn("etlegacy", q3)
        self.assertIn("etlegacy", et)
        self.assertNotIn("ioquake3", et)


class ReadersFollowTheDataTrees(unittest.TestCase):
    """Dolphin names codehandler.bin without a hash. The pack takes it from
    data/dolphin-sys, and the site credited Dolphin and Triforce with the
    Dolphin-MMJR copy, another revision, because the consumers resolved
    without the data trees. Reads the repository."""

    def test_dolphin_does_not_read_the_mmjr_copy(self):
        import os

        from common import load_database, load_emulator_profiles

        if not (REPO_ROOT / "database.json").is_file() or not (
            REPO_ROOT / "data" / "dolphin-sys" / "codehandler.bin"
        ).is_file():
            self.skipTest("database.json or data/dolphin-sys is absent")
        previous = os.getcwd()
        os.chdir(REPO_ROOT)
        try:
            db = load_database("database.json")
            profiles = load_emulator_profiles("emulators")
            consumers = FileConsumers(db)
            consumers.add_emulators({"dolphin": profiles["dolphin"]})
        finally:
            os.chdir(previous)
        mmjr = next(
            (sha1 for sha1, entry in db["files"].items()
             if entry["path"] == "bios/Other/dolphin-mmjr/codehandler.bin"),
            None,
        )
        if mmjr is None:
            self.skipTest("the Dolphin-MMJR copy is not collected")
        self.assertNotIn("dolphin", consumers.emulators.get(mmjr, set()))


def tearDownModule():
    _TMP.cleanup()


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