"""Tests for ``alfred.infrastructure.subtitle.rule_repository.RuleSetRepository``.

Loads/saves the SubtitleRuleSet inheritance chain from ``.alfred/`` YAML.

Coverage:

- ``TestLoad`` — no files → ``global_default``; rules.yaml override applied
  on top; release_groups/{NAME}.yaml override applied;
  SubtitlePreferences seeds the base when provided; full 3-level chain.
- ``TestFilterOverride`` — unknown keys discarded.
- ``TestSaveLocal`` — atomic write, merges with existing, creates .alfred/.
"""

from __future__ import annotations

from pathlib import Path

import yaml

from alfred.infrastructure.persistence.memory.ltm.components.subtitle_preferences import (
    SubtitlePreferences,
)
from alfred.infrastructure.subtitle.rule_repository import (
    RuleSetRepository,
    _filter_override,
)


def _write(path: Path, data: dict) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(yaml.safe_dump(data), encoding="utf-8")


# --------------------------------------------------------------------------- #
# _filter_override                                                             #
# --------------------------------------------------------------------------- #


class TestFilterOverride:
    def test_keeps_only_valid_keys(self):
        out = _filter_override(
            {
                "languages": ["fra"],
                "formats": ["srt"],
                "types": ["standard"],
                "format_priority": ["srt"],
                "min_confidence": 0.8,
                "unknown_key": "ignored",
                "another": 42,
            }
        )
        assert set(out) == {
            "languages",
            "formats",
            "types",
            "format_priority",
            "min_confidence",
        }
        assert "unknown_key" not in out

    def test_empty(self):
        assert _filter_override({}) == {}


# --------------------------------------------------------------------------- #
# load                                                                         #
# --------------------------------------------------------------------------- #


class TestLoad:
    def test_no_files_returns_global_default(self, tmp_path):
        repo = RuleSetRepository(tmp_path)
        rs = repo.load()
        # Should resolve cleanly using the hardcoded defaults.
        rules = rs.resolve()
        assert rules.preferred_languages  # non-empty
        assert rules.min_confidence > 0

    def test_subtitle_preferences_override_base(self, tmp_path):
        prefs = SubtitlePreferences(
            languages=["jpn"], formats=["ass"], types=["standard"]
        )
        repo = RuleSetRepository(tmp_path)
        rules = repo.load(subtitle_preferences=prefs).resolve()
        assert rules.preferred_languages == ["jpn"]
        assert rules.preferred_formats == ["ass"]
        assert rules.allowed_types == ["standard"]

    def test_local_rules_yaml_applied(self, tmp_path):
        _write(
            tmp_path / ".alfred" / "rules.yaml",
            {"override": {"languages": ["spa"], "min_confidence": 0.95}},
        )
        repo = RuleSetRepository(tmp_path)
        rules = repo.load().resolve()
        assert rules.preferred_languages == ["spa"]
        assert rules.min_confidence == 0.95

    def test_release_group_override_applied(self, tmp_path):
        _write(
            tmp_path / ".alfred" / "release_groups" / "KONTRAST.yaml",
            {"override": {"format_priority": ["ass", "srt"]}},
        )
        repo = RuleSetRepository(tmp_path)
        rules = repo.load(release_group="KONTRAST").resolve()
        assert rules.format_priority == ["ass", "srt"]

    def test_full_three_level_chain(self, tmp_path):
        # Base: prefs sets languages=["jpn"]
        prefs = SubtitlePreferences(languages=["jpn"])
        # Group: overrides format_priority
        _write(
            tmp_path / ".alfred" / "release_groups" / "GRP.yaml",
            {"override": {"format_priority": ["ass"]}},
        )
        # Local: overrides min_confidence
        _write(
            tmp_path / ".alfred" / "rules.yaml",
            {"override": {"min_confidence": 0.99}},
        )
        repo = RuleSetRepository(tmp_path)
        rules = repo.load(release_group="GRP", subtitle_preferences=prefs).resolve()
        # All three levels visible — local overrides on top
        assert rules.preferred_languages == ["jpn"]
        assert rules.format_priority == ["ass"]
        assert rules.min_confidence == 0.99

    def test_release_group_yaml_without_override_section_ignored(self, tmp_path):
        _write(
            tmp_path / ".alfred" / "release_groups" / "GRP.yaml",
            {"name": "GRP"},  # no 'override' key
        )
        # Must not crash and must not introduce an intermediate node.
        repo = RuleSetRepository(tmp_path)
        rs = repo.load(release_group="GRP")
        # No extra rule set was created → it's still the global default.
        assert rs.scope.level == "global"

    def test_missing_release_group_file_silently_ignored(self, tmp_path):
        repo = RuleSetRepository(tmp_path)
        rs = repo.load(release_group="DOES_NOT_EXIST")
        assert rs.scope.level == "global"


# --------------------------------------------------------------------------- #
# save_local                                                                   #
# --------------------------------------------------------------------------- #


class TestSaveLocal:
    def test_creates_file(self, tmp_path):
        repo = RuleSetRepository(tmp_path)
        repo.save_local({"languages": ["spa"]})
        path = tmp_path / ".alfred" / "rules.yaml"
        assert path.is_file()
        loaded = yaml.safe_load(path.read_text())
        assert loaded == {"override": {"languages": ["spa"]}}

    def test_merges_with_existing(self, tmp_path):
        repo = RuleSetRepository(tmp_path)
        repo.save_local({"languages": ["spa"]})
        repo.save_local({"min_confidence": 0.8})
        loaded = yaml.safe_load((tmp_path / ".alfred" / "rules.yaml").read_text())
        assert loaded["override"]["languages"] == ["spa"]
        assert loaded["override"]["min_confidence"] == 0.8

    def test_overwrites_existing_key(self, tmp_path):
        repo = RuleSetRepository(tmp_path)
        repo.save_local({"languages": ["spa"]})
        repo.save_local({"languages": ["jpn"]})
        loaded = yaml.safe_load((tmp_path / ".alfred" / "rules.yaml").read_text())
        assert loaded["override"]["languages"] == ["jpn"]

    def test_temp_file_cleaned_up(self, tmp_path):
        repo = RuleSetRepository(tmp_path)
        repo.save_local({"languages": ["spa"]})
        # No stale .tmp file
        assert not (tmp_path / ".alfred" / "rules.yaml.tmp").exists()