"""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."""

    def setUp(self):
        import os

        self._previous = os.getcwd()
        self._tree = tempfile.TemporaryDirectory()
        root = Path(self._tree.name)
        fork = root / "bios" / "Other" / "dolphin-mmjr" / "codehandler.bin"
        fork.parent.mkdir(parents=True)
        fork.write_bytes(b"dolphin-mmjr codehandler")
        own = root / "data" / "dolphin-sys" / "codehandler.bin"
        own.parent.mkdir(parents=True)
        own.write_bytes(b"dolphin codehandler")
        self.fork_sha1 = hashlib.sha1(fork.read_bytes()).hexdigest()
        self.db = {
            "files": {self.fork_sha1: {
                "name": "codehandler.bin", "sha1": self.fork_sha1,
                "path": "bios/Other/dolphin-mmjr/codehandler.bin",
                "md5": hashlib.md5(fork.read_bytes()).hexdigest(),
                "size": fork.stat().st_size,
            }},
            "indexes": {
                "by_name": {"codehandler.bin": [self.fork_sha1]},
                "by_md5": {}, "by_path_suffix": {},
            },
        }
        self.registry = {"dolphin-sys": {"local_cache": str(own.parent)}}
        self.profiles = {"dolphin": {"type": "standalone + libretro", "files": [
            {"name": "codehandler.bin", "path": None, "mode": "libretro"},
        ]}}
        os.chdir(root)

    def tearDown(self):
        import os

        from common import forget_data_dir_index

        os.chdir(self._previous)
        forget_data_dir_index()
        self._tree.cleanup()

    def _readers(self, registry: dict) -> set[str]:
        consumers = FileConsumers(self.db, data_dir_registry=registry)
        consumers.add_emulators(self.profiles)
        return consumers.emulators.get(self.fork_sha1, set())

    def test_dolphin_does_not_read_the_mmjr_copy(self):
        self.assertNotIn("dolphin", self._readers(self.registry))

    def test_without_the_data_trees_the_name_step_takes_the_fork_copy(self):
        """The case above has to reach the data trees to pass: resolved
        without them, the name alone hands Dolphin the fork's copy."""
        self.assertIn("dolphin", self._readers({}))


def tearDownModule():
    _TMP.cleanup()


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