"""Typing-progress persistence and the ``record_run`` bookkeeping it drives."""

from __future__ import annotations

from pathlib import Path

from musicmouse.tippen.curriculum import Curriculum, Lesson, World
from musicmouse.tippen.progress import (
    DILIGENCE_ATTEMPTS,
    RunResult,
    Stroke,
    fresh_progress,
    load_progress,
    record_run,
    save_progress,
)


def _lesson(id: str, world: int, number: int, **overrides: object) -> Lesson:
    base: dict = {
        "id": id,
        "world": world,
        "number": number,
        "title": id,
        "subtitle": "",
        "kind": "letters",
        "new_keys": (),
        "spotlight_keys": (),
        "emphasis": None,
        "active_keys": (),
        "primary_mode": "dive",
        "bonus_modes": (),
        "words": (),
        "is_drill": False,
        "chunks": 1,
        "chunk_size": 1,
        "unlocks": None,
    }
    base.update(overrides)
    return Lesson(**base)  # type: ignore[arg-type]


def _curriculum() -> Curriculum:
    lessons = (
        _lesson("l01", 1, 1),
        _lesson("l02", 1, 2, unlocks="Musik/Album/00.mp3"),
        _lesson("l03", 2, 1),
    )
    worlds = (
        World(number=1, title="Riff", emoji="🐠", reward="clownfish"),
        World(number=2, title="Höhle", emoji="🐙", reward="octopus"),
    )
    return Curriculum(worlds=worlds, lessons=lessons)


def _result(*, stars: int, passed: bool, points: float = 10.0, pearls: int = 3) -> RunResult:
    return RunResult(
        stars=stars,  # type: ignore[arg-type]
        animal="fish",
        points=points,
        passed=passed,
        pearls=pearls,
        strokes=(Stroke(key="a", expected="a", correct=True, at=0.0),),
    )


# ------------------------------------------------------------------------ persistence


def test_fresh_progress_unlocks_only_the_first_lesson() -> None:
    progress = fresh_progress(_curriculum())
    assert progress.lessons["l01"].unlocked is True
    assert progress.lessons["l02"].unlocked is False
    assert progress.lessons["l03"].unlocked is False


def test_a_missing_file_is_a_fresh_start(tmp_path: Path) -> None:
    progress = load_progress(tmp_path / "no-such-file.json", _curriculum())
    assert progress == fresh_progress(_curriculum())


def test_a_corrupt_file_is_a_fresh_start_not_a_crash(tmp_path: Path) -> None:
    path = tmp_path / "progress.json"
    path.write_text("{not valid json", encoding="utf-8")
    progress = load_progress(path, _curriculum())
    assert progress == fresh_progress(_curriculum())


def test_save_then_load_round_trips(tmp_path: Path) -> None:
    path = tmp_path / "progress.json"
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    outcome = record_run(
        progress, "l01", _result(stars=3, passed=True), curriculum, day="2026-01-01"
    )

    save_progress(path, outcome.progress)
    reloaded = load_progress(path, curriculum)

    assert reloaded.lessons["l01"].best_stars == 3
    assert reloaded.lessons["l02"].unlocked is True
    assert reloaded.pearls == 3
    # Atomic write leaves no temp file behind.
    assert list(tmp_path.glob("*.tmp*")) == []


def test_a_lesson_added_to_the_curriculum_since_the_last_save_gets_an_entry(tmp_path: Path) -> None:
    path = tmp_path / "progress.json"
    small = Curriculum(
        worlds=(World(number=1, title="Riff", emoji="🐠", reward="clownfish"),),
        lessons=(_lesson("l01", 1, 1),),
    )
    save_progress(path, fresh_progress(small))

    grown = _curriculum()
    reloaded = load_progress(path, grown)
    assert "l02" in reloaded.lessons
    assert "l03" in reloaded.lessons


# --------------------------------------------------------------------------- earning


def test_two_stars_unlocks_the_next_lesson() -> None:
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    outcome = record_run(
        progress, "l01", _result(stars=2, passed=True), curriculum, day="2026-01-01"
    )
    assert outcome.newly_earned is True
    assert outcome.unlocked_lesson_id == "l02"
    assert outcome.progress.lessons["l02"].unlocked is True


def test_one_star_does_not_unlock_the_next_lesson() -> None:
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    outcome = record_run(
        progress, "l01", _result(stars=1, passed=False), curriculum, day="2026-01-01"
    )
    assert outcome.newly_earned is False
    assert outcome.unlocked_lesson_id is None


def test_the_diligence_attempt_unlocks_regardless_of_score() -> None:
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    for _ in range(DILIGENCE_ATTEMPTS - 1):
        outcome = record_run(
            progress, "l01", _result(stars=0, passed=False), curriculum, day="2026-01-01"
        )
        progress = outcome.progress
        assert outcome.newly_earned is False

    outcome = record_run(
        progress, "l01", _result(stars=0, passed=False), curriculum, day="2026-01-01"
    )
    assert outcome.progress.lessons["l01"].runs == DILIGENCE_ATTEMPTS
    assert outcome.newly_earned is True
    assert outcome.unlocked_lesson_id == "l02"


def test_a_replay_after_already_earned_does_not_re_unlock() -> None:
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    first = record_run(progress, "l01", _result(stars=3, passed=True), curriculum, day="2026-01-01")
    assert first.unlocked_lesson_id == "l02"

    again = record_run(
        first.progress, "l01", _result(stars=3, passed=True), curriculum, day="2026-01-02"
    )
    assert again.newly_earned is False
    assert again.unlocked_lesson_id is None


def test_best_score_only_improves() -> None:
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    good = record_run(
        progress, "l01", _result(stars=3, passed=True, points=100), curriculum, day="2026-01-01"
    )
    worse = record_run(
        good.progress, "l01", _result(stars=1, passed=False, points=5), curriculum, day="2026-01-02"
    )
    assert worse.progress.lessons["l01"].best_stars == 3
    assert worse.progress.lessons["l01"].best_points == 100
    assert worse.is_new_best is False


def test_finishing_a_world_awards_its_creature_exactly_once() -> None:
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    # Pass l01 (does not cross a world boundary: l02 is still world 1).
    step1 = record_run(progress, "l01", _result(stars=3, passed=True), curriculum, day="2026-01-01")
    assert step1.new_creature is None

    # Pass l02: the next lesson (l03) is world 2, so this crosses the boundary.
    step2 = record_run(
        step1.progress, "l02", _result(stars=3, passed=True), curriculum, day="2026-01-02"
    )
    assert step2.new_creature == "clownfish"
    assert step2.progress.aquarium == ["clownfish"]

    # Replaying l02 after l03 is already unlocked must never award it twice.
    step3 = record_run(
        step2.progress, "l02", _result(stars=3, passed=True), curriculum, day="2026-01-03"
    )
    assert step3.new_creature is None
    assert step3.progress.aquarium == ["clownfish"]


def test_pearls_and_streak_accumulate() -> None:
    curriculum = _curriculum()
    progress = fresh_progress(curriculum)
    day1 = record_run(
        progress, "l01", _result(stars=1, passed=False, pearls=3), curriculum, day="2026-01-01"
    )
    day2 = record_run(
        day1.progress, "l01", _result(stars=1, passed=False, pearls=4), curriculum, day="2026-01-02"
    )
    assert day2.progress.pearls == 7
    assert day2.progress.streak.days == 2
    assert day2.progress.streak.last_played == "2026-01-02"

    # A missed day (skip to 2026-01-05) restarts the streak at 1, not 0.
    day5 = record_run(
        day2.progress, "l01", _result(stars=1, passed=False), curriculum, day="2026-01-05"
    )
    assert day5.progress.streak.days == 1