wintf 0.0.3

use super::*;
use crate::ecs::drag::{
    DragAccumulatorResource, DragTransition, WindowDragContext, WindowDragContextResource,
    install_drag_accumulator,
};
use bevy_ecs::world::World;

// NOTE: `DRAG_STATE` is a thread_local。テストワーカースレッドは再利用され得るため、
// 各テストは Idle へ強制リセットしてから開始する（前のテストが残した状態への依存を排除）。
// SetCapture/ReleaseCapture は HWND::default()（null）に対し UI スレッド外では実質 no-op の
// ため、状態機械そのものはデバイス非依存に検証できる（capture_guard_panic_safety_test と同じ前提）。

/// thread_local を Idle へ強制的に戻す（CaptureGuard が残っていれば borrow 解放後にドロップ）。
fn force_idle() {
    let _guard = update_drag_state(|state| {
        let old = std::mem::replace(state, DragState::Idle);
        // 旧状態に CaptureGuard があれば取り出して borrow 解放後にドロップさせる
        match old {
            DragState::Preparing { capture_guard, .. }
            | DragState::JustStarted { capture_guard, .. }
            | DragState::Dragging { capture_guard, .. } => Some(capture_guard),
            _ => None,
        }
    });
}

fn null_hwnd() -> HWND {
    HWND::default()
}

fn entity(idx: u32) -> Entity {
    // bevy の World 無しでテスト用 Entity を生成する（index→Entity の決定論的生成）
    Entity::from_raw_u32(idx).expect("valid entity index")
}

/// snapshot のバリアント判別子のみを比較するためのヘルパ。
fn variant_name(s: &DragStateSnapshot) -> &'static str {
    match s {
        DragStateSnapshot::Idle => "Idle",
        DragStateSnapshot::Preparing { .. } => "Preparing",
        DragStateSnapshot::JustStarted { .. } => "JustStarted",
        DragStateSnapshot::Dragging { .. } => "Dragging",
        DragStateSnapshot::JustEnded { .. } => "JustEnded",
    }
}

// --- start_preparing -----------------------------------------------------

/// Idle から start_preparing で Preparing へ遷移し、entity/start_pos を保持する。
#[test]
fn test_start_preparing_from_idle_enters_preparing() {
    force_idle();
    let e = entity(1);
    let pos = PhysicalPoint::new(10, 20);
    start_preparing(e, pos, null_hwnd());

    let snap = snapshot_drag_state();
    match snap {
        DragStateSnapshot::Preparing {
            entity, start_pos, ..
        } => {
            assert_eq!(entity, e);
            assert_eq!(start_pos.x, 10);
            assert_eq!(start_pos.y, 20);
        }
        other => panic!("expected Preparing, got {}", variant_name(&other)),
    }
    force_idle();
}

/// 既に Preparing 中の start_preparing は無視される（複数ボタン同時ドラッグ禁止）。
/// 既存の entity/start_pos が維持されることを確認する。
#[test]
fn test_start_preparing_ignored_when_already_active() {
    force_idle();
    let first = entity(1);
    let second = entity(2);
    start_preparing(first, PhysicalPoint::new(1, 1), null_hwnd());
    // 2 回目（別エンティティ・別座標）は無視されるはず
    start_preparing(second, PhysicalPoint::new(99, 99), null_hwnd());

    let snap = snapshot_drag_state();
    match snap {
        DragStateSnapshot::Preparing {
            entity, start_pos, ..
        } => {
            assert_eq!(entity, first, "最初の press が維持されるべき");
            assert_eq!((start_pos.x, start_pos.y), (1, 1));
        }
        other => panic!("expected Preparing, got {}", variant_name(&other)),
    }
    force_idle();
}

/// JustEnded からの start_preparing は許可される（前ドラッグ終了後の新規ドラッグ）。
#[test]
fn test_start_preparing_allowed_from_just_ended() {
    force_idle();
    let e1 = entity(1);
    start_preparing(e1, PhysicalPoint::new(5, 5), null_hwnd());
    end_dragging(PhysicalPoint::new(5, 5), false); // → JustEnded
    assert!(matches!(
        snapshot_drag_state(),
        DragStateSnapshot::JustEnded { .. }
    ));

    let e2 = entity(2);
    start_preparing(e2, PhysicalPoint::new(7, 8), null_hwnd());
    match snapshot_drag_state() {
        DragStateSnapshot::Preparing { entity, .. } => assert_eq!(entity, e2),
        other => panic!("expected Preparing, got {}", variant_name(&other)),
    }
    force_idle();
}

// --- start_dragging ------------------------------------------------------

/// Preparing → JustStarted 遷移。entity/start_pos は維持、current_pos が反映される。
#[test]
fn test_start_dragging_preparing_to_just_started() {
    force_idle();
    let e = entity(3);
    start_preparing(e, PhysicalPoint::new(10, 10), null_hwnd());
    start_dragging(PhysicalPoint::new(18, 14));

    match snapshot_drag_state() {
        DragStateSnapshot::JustStarted {
            entity,
            start_pos,
            current_pos,
            ..
        } => {
            assert_eq!(entity, e);
            assert_eq!((start_pos.x, start_pos.y), (10, 10));
            assert_eq!((current_pos.x, current_pos.y), (18, 14));
        }
        other => panic!("expected JustStarted, got {}", variant_name(&other)),
    }
    force_idle();
}

/// start_dragging は Preparing 以外では no-op（Idle のまま）。
#[test]
fn test_start_dragging_noop_when_not_preparing() {
    force_idle();
    start_dragging(PhysicalPoint::new(1, 1));
    assert!(
        matches!(snapshot_drag_state(), DragStateSnapshot::Idle),
        "Idle からの start_dragging は何もしないべき"
    );
    force_idle();
}

// --- update_dragging -----------------------------------------------------

/// JustStarted → Dragging 遷移。drag_context=None のとき HWND/位置/move_window/constraint は
/// デフォルト値（null HWND, (0,0), false, None）になる。
#[test]
fn test_update_dragging_just_started_to_dragging_without_context() {
    force_idle();
    let e = entity(4);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    start_dragging(PhysicalPoint::new(6, 6));
    update_dragging(PhysicalPoint::new(6, 6), None);

    match snapshot_drag_state() {
        DragStateSnapshot::Dragging {
            entity,
            current_pos,
            prev_pos,
            move_window,
            constraint,
            initial_window_pos,
            ..
        } => {
            assert_eq!(entity, e);
            assert_eq!((current_pos.x, current_pos.y), (6, 6));
            // 初回 Dragging では prev_pos == current_pos
            assert_eq!((prev_pos.x, prev_pos.y), (6, 6));
            assert!(!move_window, "context 無しでは move_window=false");
            assert!(constraint.is_none());
            assert_eq!((initial_window_pos.x, initial_window_pos.y), (0, 0));
        }
        other => panic!("expected Dragging, got {}", variant_name(&other)),
    }
    force_idle();
}

/// JustStarted → Dragging 遷移で WindowDragContextResource の hwnd/initial_window_pos/
/// move_window/constraint が DragState::Dragging に取り込まれる。
#[test]
fn test_update_dragging_reads_window_drag_context() {
    force_idle();
    let e = entity(5);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    start_dragging(PhysicalPoint::new(3, 3));

    let ctx_res = WindowDragContextResource::new();
    let constraint = DragConstraint {
        min_x: Some(-10),
        max_x: Some(500),
        min_y: None,
        max_y: None,
    };
    ctx_res.set(WindowDragContext {
        hwnd: Some(null_hwnd()),
        initial_window_pos: Some(Point { x: 100, y: 200 }),
        move_window: true,
        constraint: Some(constraint),
    });

    update_dragging(PhysicalPoint::new(3, 3), Some(&ctx_res));

    match snapshot_drag_state() {
        DragStateSnapshot::Dragging {
            move_window,
            initial_window_pos,
            constraint,
            ..
        } => {
            assert!(move_window, "context の move_window=true が反映されるべき");
            assert_eq!((initial_window_pos.x, initial_window_pos.y), (100, 200));
            let c = constraint.expect("constraint が反映されるべき");
            assert_eq!(c.min_x, Some(-10));
            assert_eq!(c.max_x, Some(500));
        }
        other => panic!("expected Dragging, got {}", variant_name(&other)),
    }
    force_idle();
}

/// Dragging → Dragging 更新で current_pos が新値、prev_pos が直前の current_pos になる。
#[test]
fn test_update_dragging_dragging_updates_prev_pos() {
    force_idle();
    let e = entity(6);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    start_dragging(PhysicalPoint::new(10, 10));
    update_dragging(PhysicalPoint::new(10, 10), None); // → Dragging (current=prev=10,10)
    update_dragging(PhysicalPoint::new(25, 30), None); // → current=25,30 / prev=10,10

    match snapshot_drag_state() {
        DragStateSnapshot::Dragging {
            current_pos,
            prev_pos,
            ..
        } => {
            assert_eq!((current_pos.x, current_pos.y), (25, 30));
            assert_eq!(
                (prev_pos.x, prev_pos.y),
                (10, 10),
                "prev_pos は直前の current_pos を保持するべき"
            );
        }
        other => panic!("expected Dragging, got {}", variant_name(&other)),
    }
    force_idle();
}

/// update_dragging は Idle/JustEnded など対象外状態では no-op。
#[test]
fn test_update_dragging_noop_when_idle() {
    force_idle();
    update_dragging(PhysicalPoint::new(5, 5), None);
    assert!(matches!(snapshot_drag_state(), DragStateSnapshot::Idle));
    force_idle();
}

// --- end_dragging --------------------------------------------------------

/// Preparing からの end_dragging は JustEnded(cancelled=false) へ。entity を保持。
#[test]
fn test_end_dragging_from_preparing() {
    force_idle();
    let e = entity(7);
    start_preparing(e, PhysicalPoint::new(40, 50), null_hwnd());
    assert_eq!(
        end_dragging(PhysicalPoint::new(41, 52), false),
        DragClose::Closed {
            entity: e,
            notified: false
        },
        "準備中からは種を積まない"
    );

    match snapshot_drag_state() {
        DragStateSnapshot::JustEnded {
            entity,
            position,
            cancelled,
        } => {
            assert_eq!(entity, e);
            assert_eq!((position.x, position.y), (41, 52));
            assert!(!cancelled);
        }
        other => panic!("expected JustEnded, got {}", variant_name(&other)),
    }
    force_idle();
}

/// Dragging からの end_dragging（cancelled=true 指定）は JustEnded(cancelled=true) へ。
#[test]
fn test_end_dragging_from_dragging_preserves_cancelled_flag() {
    force_idle();
    let e = entity(8);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    start_dragging(PhysicalPoint::new(9, 9));
    update_dragging(PhysicalPoint::new(9, 9), None);
    end_dragging(PhysicalPoint::new(60, 70), true);

    match snapshot_drag_state() {
        DragStateSnapshot::JustEnded {
            entity,
            position,
            cancelled,
        } => {
            assert_eq!(entity, e);
            assert_eq!((position.x, position.y), (60, 70));
            assert!(
                cancelled,
                "end_dragging に渡した cancelled=true が反映されるべき"
            );
        }
        other => panic!("expected JustEnded, got {}", variant_name(&other)),
    }
    force_idle();
}

/// Idle からの end_dragging は no-op（JustEnded を作らない）。
#[test]
fn test_end_dragging_noop_when_idle() {
    force_idle();
    assert_eq!(
        end_dragging(PhysicalPoint::new(1, 1), false),
        DragClose::NotActive
    );
    assert!(matches!(snapshot_drag_state(), DragStateSnapshot::Idle));
    force_idle();
}

// --- cancel_dragging -----------------------------------------------------

/// cancel_dragging は常に JustEnded(cancelled=true, position=start_pos) へ。
#[test]
fn test_cancel_dragging_uses_start_pos_and_sets_cancelled() {
    force_idle();
    let e = entity(9);
    start_preparing(e, PhysicalPoint::new(33, 44), null_hwnd());
    start_dragging(PhysicalPoint::new(80, 90)); // start_pos は 33,44 のまま
    cancel_dragging();

    match snapshot_drag_state() {
        DragStateSnapshot::JustEnded {
            entity,
            position,
            cancelled,
        } => {
            assert_eq!(entity, e);
            assert!(cancelled);
            assert_eq!(
                (position.x, position.y),
                (33, 44),
                "cancel は終了位置に start_pos を使うべき"
            );
        }
        other => panic!("expected JustEnded, got {}", variant_name(&other)),
    }
    force_idle();
}

/// Idle からの cancel_dragging は no-op。
#[test]
fn test_cancel_dragging_noop_when_idle() {
    force_idle();
    assert_eq!(cancel_dragging(), DragClose::NotActive);
    assert!(matches!(snapshot_drag_state(), DragStateSnapshot::Idle));
    force_idle();
}

// --- check_threshold -----------------------------------------------------

/// Preparing 中、ユークリッド距離の二乗が閾値の二乗以上なら true。
#[test]
fn test_check_threshold_true_at_or_beyond_distance() {
    force_idle();
    let e = entity(12);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    // (3,4) は距離 5 = 閾値ちょうど → true（>=）
    assert!(check_threshold(PhysicalPoint::new(3, 4), 5));
    // (10,0) は距離 10 > 5 → true
    assert!(check_threshold(PhysicalPoint::new(10, 0), 5));
    force_idle();
}

/// Preparing 中、距離が閾値未満なら false。
#[test]
fn test_check_threshold_false_below_distance() {
    force_idle();
    let e = entity(13);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    // (3,3) は距離 sqrt(18)≈4.24 < 5 → false
    assert!(!check_threshold(PhysicalPoint::new(3, 3), 5));
    force_idle();
}

/// Preparing 以外の状態では check_threshold は常に false（warn ログのみ）。
#[test]
fn test_check_threshold_false_when_not_preparing() {
    force_idle();
    // Idle 状態
    assert!(!check_threshold(PhysicalPoint::new(100, 100), 1));
    force_idle();
}

/// 負方向の座標差（start_pos > current_pos）でも dx*dx が正に評価され、
/// 距離判定が対称に働く（i32 乗算は符号で結果が変わらないことの特性化）。
#[test]
fn test_check_threshold_symmetric_for_negative_delta() {
    force_idle();
    let e = entity(20);
    // start_pos を正値にし、current_pos を左上へ動かして dx/dy を負にする
    start_preparing(e, PhysicalPoint::new(100, 100), null_hwnd());
    // (97,96) → dx=-3, dy=-4, 距離 5 = 閾値ちょうど → true（>= かつ符号非依存）
    assert!(check_threshold(PhysicalPoint::new(97, 96), 5));
    // (98,98) → dx=-2, dy=-2, 距離 sqrt(8)≈2.83 < 5 → false
    assert!(!check_threshold(PhysicalPoint::new(98, 98), 5));
    force_idle();
}

/// i16 実用座標の極値差（本番入力範囲の上限相当）でも i32 算術が桁あふれせず
/// 正確に評価される安全鎖の特性化。dx=32767, dy=0 → distance_sq=1_073_676_289
/// （< i32::MAX=2_147_483_647）で、閾値 5 を上回り true。
/// （ドキュメントの桁あふれ境界 |dx|>46340 には達しない実用上限を固定）。
#[test]
fn test_check_threshold_i16_extent_delta_no_overflow() {
    force_idle();
    let e = entity(21);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    // i16::MAX 相当の水平デルタ。dx*dx は i32 範囲内で桁あふれせず true。
    assert!(check_threshold(PhysicalPoint::new(32767, 0), 5));
    force_idle();
}

// --- snapshot ------------------------------------------------------------

/// DragState::snapshot が各バリアントを対応する DragStateSnapshot バリアントに写像する。
#[test]
fn test_snapshot_maps_each_variant() {
    force_idle();
    // Idle
    assert_eq!(variant_name(&snapshot_drag_state()), "Idle");

    let e = entity(14);
    // Preparing
    start_preparing(e, PhysicalPoint::new(1, 2), null_hwnd());
    assert_eq!(variant_name(&snapshot_drag_state()), "Preparing");

    // JustStarted
    start_dragging(PhysicalPoint::new(2, 3));
    assert_eq!(variant_name(&snapshot_drag_state()), "JustStarted");

    // Dragging
    update_dragging(PhysicalPoint::new(2, 3), None);
    assert_eq!(variant_name(&snapshot_drag_state()), "Dragging");

    // JustEnded
    end_dragging(PhysicalPoint::new(5, 5), false);
    assert_eq!(variant_name(&snapshot_drag_state()), "JustEnded");

    force_idle();
}

/// read_drag_state クロージャに現在の DragState 参照が渡される。
#[test]
fn test_read_drag_state_observes_current_state() {
    force_idle();
    let observed_idle = read_drag_state(|s| matches!(s, DragState::Idle));
    assert!(observed_idle);

    let e = entity(15);
    start_preparing(e, PhysicalPoint::new(0, 0), null_hwnd());
    let observed_preparing = read_drag_state(|s| matches!(s, DragState::Preparing { .. }));
    assert!(observed_preparing);
    force_idle();
}

// --- 休止の契約（解放・中断のあとは次の左押下まで休む） -------------------

/// 状態そのものと写しの両方の `is_button_held` が期待どおりで、写しの variant も一致する。
fn assert_held(expected_variant: &str, expected_held: bool) {
    assert_eq!(variant_name(&snapshot_drag_state()), expected_variant);
    assert_eq!(
        read_drag_state(|s| s.is_button_held()),
        expected_held,
        "DragState::is_button_held（{expected_variant}）"
    );
    assert_eq!(
        snapshot_drag_state().is_button_held(),
        expected_held,
        "DragStateSnapshot::is_button_held（{expected_variant}）"
    );
}

/// 述語の真偽表: 製品と同じ遷移関数で 5 状態を順に組み、
/// Preparing・JustStarted・Dragging で真、Idle・JustEnded で偽。
#[test]
fn test_is_button_held_truth_table_over_product_transitions() {
    force_idle();
    assert_held("Idle", false);
    start_preparing(entity(20), PhysicalPoint::new(0, 0), null_hwnd());
    assert_held("Preparing", true);
    start_dragging(PhysicalPoint::new(8, 0));
    assert_held("JustStarted", true);
    update_dragging(PhysicalPoint::new(9, 0), None);
    assert_held("Dragging", true);
    end_dragging(PhysicalPoint::new(9, 0), false);
    assert_held("JustEnded", false);
    force_idle();
}

/// 解放の契約: 解放の直後は JustEnded・述語は偽で、他の関数を呼ばずに
/// 別の entity の左押下がそのまま受け付けられる。
#[test]
fn test_release_rests_until_next_press() {
    force_idle();
    start_preparing(entity(21), PhysicalPoint::new(1, 1), null_hwnd());
    end_dragging(PhysicalPoint::new(1, 1), false);
    assert_held("JustEnded", false);

    start_preparing(entity(22), PhysicalPoint::new(2, 2), null_hwnd());
    match snapshot_drag_state() {
        DragStateSnapshot::Preparing { entity: e, .. } => assert_eq!(e, entity(22)),
        other => panic!("expected Preparing, got {}", variant_name(&other)),
    }
    force_idle();
}

/// 中断の契約: 移動を始めてからの中断でも、解放と同じく次の左押下まで休む。
#[test]
fn test_cancel_rests_until_next_press() {
    force_idle();
    start_preparing(entity(23), PhysicalPoint::new(1, 1), null_hwnd());
    start_dragging(PhysicalPoint::new(9, 1));
    cancel_dragging();
    assert_held("JustEnded", false);

    start_preparing(entity(24), PhysicalPoint::new(2, 2), null_hwnd());
    match snapshot_drag_state() {
        DragStateSnapshot::Preparing { entity: e, .. } => assert_eq!(e, entity(24)),
        other => panic!("expected Preparing, got {}", variant_name(&other)),
    }
    force_idle();
}

// --- 休ませた結果と終了の種（要件 2.1・2.2・3.1〜3.3・4.1〜4.3） -------------

/// このスレッドの控えへ新しい累積器を置き、World の資源と同じ実体の複製を返す（種を数えるため）。
fn install_handle() -> DragAccumulatorResource {
    let mut world = World::new();
    install_drag_accumulator(&mut world);
    world.resource::<DragAccumulatorResource>().clone()
}

/// 開始の種を手で積む（開始の種は `mouse_move.rs` が積み、`start_dragging` は積まない）。
fn push_started(acc: &DragAccumulatorResource, e: Entity) {
    acc.set_transition(DragTransition::Started {
        entity: e,
        start_pos: PhysicalPoint::new(0, 0),
        timestamp: Instant::now(),
    });
}

/// flush して終了の種だけを (対象, 位置, 取り消しか) で並べる。
fn ended_seeds(acc: &DragAccumulatorResource) -> Vec<(Entity, (i32, i32), bool)> {
    acc.flush()
        .expect("flush")
        .transitions
        .into_iter()
        .filter_map(|t| match t {
            DragTransition::Ended {
                entity,
                end_pos,
                cancelled,
            } => Some((entity, (end_pos.x, end_pos.y), cancelled)),
            DragTransition::Started { .. } => None,
        })
        .collect()
}

/// 押し → 閾値越え（`dragging` なら配る段の写し `update_dragging` で Dragging）まで進める。
fn drive_to(e: Entity, dragging: bool) {
    start_preparing(e, PhysicalPoint::new(10, 10), null_hwnd());
    start_dragging(PhysicalPoint::new(20, 10));
    if dragging {
        update_dragging(PhysicalPoint::new(30, 15), None);
    }
}

/// 休ませる 4 つの関数（離しは捕捉を取った窓＝空の窓・位置なし）。
const CLOSERS: [(&str, fn() -> DragClose); 4] = [
    ("end_dragging", || {
        end_dragging(PhysicalPoint::new(1, 1), false)
    }),
    ("cancel_dragging", cancel_dragging),
    ("capture_lost", cancel_dragging_on_capture_lost),
    ("release", || end_dragging_on_release(HWND::default(), None)),
];

/// 開始済み（JustStarted・Dragging）からの `end_dragging` は、休ませて終了の種をちょうど 1 件積む。
#[test]
fn test_end_dragging_from_started_states_pushes_exactly_one_end_seed() {
    for dragging in [false, true] {
        force_idle();
        let acc = install_handle();
        let e = entity(30);
        push_started(&acc, e);
        drive_to(e, dragging);

        let result = end_dragging(PhysicalPoint::new(60, 70), false);

        assert_eq!(
            result,
            DragClose::Closed {
                entity: e,
                notified: true
            },
            "dragging={dragging}"
        );
        assert_eq!(ended_seeds(&acc), vec![(e, (60, 70), false)]);
        assert_held("JustEnded", false);
    }
    force_idle();
}

/// 開始済みからの `cancel_dragging` は、押した位置・取り消しの印つきの種を 1 件積む。
#[test]
fn test_cancel_dragging_from_started_states_pushes_cancelled_seed_at_press() {
    for dragging in [false, true] {
        force_idle();
        let acc = install_handle();
        let e = entity(31);
        push_started(&acc, e);
        drive_to(e, dragging);

        assert_eq!(
            cancel_dragging(),
            DragClose::Closed {
                entity: e,
                notified: true
            },
            "dragging={dragging}"
        );
        assert_eq!(ended_seeds(&acc), vec![(e, (10, 10), true)]);
    }
    force_idle();
}

/// 準備中（閾値前）からは休ませるが種は積まない（4 つの関数とも）。
/// 累積器が終了を受け付ける形（開始を積んである）にしておき、積めば見える状態で確かめる。
#[test]
fn test_closing_from_preparing_pushes_no_seed() {
    for (name, close) in CLOSERS {
        force_idle();
        let acc = install_handle();
        let e = entity(32);
        push_started(&acc, e);
        start_preparing(e, PhysicalPoint::new(10, 10), null_hwnd());

        assert_eq!(
            close(),
            DragClose::Closed {
                entity: e,
                notified: false
            },
            "{name}"
        );
        assert_held("JustEnded", false);
        assert!(ended_seeds(&acc).is_empty(), "{name}: 準備中から種を積んだ");
    }
    force_idle();
}

/// 押していない（Idle・JustEnded）ときは、4 つの関数とも何もせず NotActive。種も積まない。
#[test]
fn test_closing_when_not_held_returns_not_active() {
    for (name, close) in CLOSERS {
        force_idle();
        let acc = install_handle();
        assert_eq!(close(), DragClose::NotActive, "{name}: Idle");
        assert_held("Idle", false);

        let e = entity(33);
        push_started(&acc, e);
        drive_to(e, true);
        end_dragging(PhysicalPoint::new(5, 5), false);
        let _ = ended_seeds(&acc);
        assert_eq!(close(), DragClose::NotActive, "{name}: JustEnded");
        assert!(ended_seeds(&acc).is_empty(), "{name}: 休んだ後に種を積んだ");
    }
    force_idle();
}

/// 捕捉を取った窓と違う窓の離しは何もしない（OtherWindow・状態はそのまま）。同じ窓なら休ませる。
#[test]
fn test_release_on_other_window_returns_other_window_and_keeps_state() {
    let other = HWND(0x1 as *mut _);
    for dragging in [false, true] {
        force_idle();
        let acc = install_handle();
        let e = entity(34);
        push_started(&acc, e);
        drive_to(e, dragging);
        let before = variant_name(&snapshot_drag_state());

        assert_eq!(
            end_dragging_on_release(other, Some(PhysicalPoint::new(1, 1))),
            DragClose::OtherWindow
        );
        assert_eq!(variant_name(&snapshot_drag_state()), before);
        assert!(ended_seeds(&acc).is_empty());

        assert_eq!(
            end_dragging_on_release(null_hwnd(), Some(PhysicalPoint::new(40, 50))),
            DragClose::Closed {
                entity: e,
                notified: true
            }
        );
        assert_eq!(ended_seeds(&acc), vec![(e, (40, 50), false)]);
    }
    // 準備中でも同じ判断（窓が違えば何もしない）
    force_idle();
    start_preparing(entity(35), PhysicalPoint::new(1, 1), null_hwnd());
    assert_eq!(end_dragging_on_release(other, None), DragClose::OtherWindow);
    assert_held("Preparing", true);
    force_idle();
}

/// 離しに位置が無いときは、状態が持つ最後の画面の座標で終える
/// （JustStarted・Dragging は current_pos、Preparing は start_pos）。取り消しの印は付けない。
#[test]
fn test_release_without_position_uses_last_screen_position() {
    for (dragging, last) in [(false, (20, 10)), (true, (30, 15))] {
        force_idle();
        let acc = install_handle();
        let e = entity(36);
        push_started(&acc, e);
        drive_to(e, dragging);

        end_dragging_on_release(null_hwnd(), None);

        match snapshot_drag_state() {
            DragStateSnapshot::JustEnded {
                position,
                cancelled,
                ..
            } => {
                assert_eq!((position.x, position.y), last);
                assert!(!cancelled);
            }
            other => panic!("expected JustEnded, got {}", variant_name(&other)),
        }
        assert_eq!(ended_seeds(&acc), vec![(e, last, false)]);
    }

    force_idle();
    start_preparing(entity(37), PhysicalPoint::new(7, 8), null_hwnd());
    end_dragging_on_release(null_hwnd(), None);
    match snapshot_drag_state() {
        DragStateSnapshot::JustEnded { position, .. } => {
            assert_eq!((position.x, position.y), (7, 8))
        }
        other => panic!("expected JustEnded, got {}", variant_name(&other)),
    }
    force_idle();
}

/// 捕捉の喪失は、捕捉の守りに解放済みの印を付けてから取り消す
/// （守りが落ちても `ReleaseCapture` を呼ばない）。ふつうの取り消しは呼ぶ。
#[test]
fn test_capture_lost_marks_guard_released_before_cancelling() {
    let released_via_drop = |events: &[log_capture_kit::CapturedEvent]| {
        events
            .iter()
            .filter(|e| e.message().contains("Capture released via Drop"))
            .count()
    };

    force_idle();
    start_preparing(entity(38), PhysicalPoint::new(3, 4), null_hwnd());
    let (result, events) = log_capture_kit::capture(cancel_dragging_on_capture_lost);
    assert!(matches!(result, DragClose::Closed { .. }), "{result:?}");
    assert_eq!(released_via_drop(&events), 0, "{events:?}");
    match snapshot_drag_state() {
        DragStateSnapshot::JustEnded {
            position,
            cancelled,
            ..
        } => {
            assert!(cancelled);
            assert_eq!((position.x, position.y), (3, 4));
        }
        other => panic!("expected JustEnded, got {}", variant_name(&other)),
    }

    // 対照: ふつうの取り消しは守りが落ちるときに ReleaseCapture を呼ぶ
    force_idle();
    start_preparing(entity(39), PhysicalPoint::new(3, 4), null_hwnd());
    let (_, events) = log_capture_kit::capture(cancel_dragging);
    assert_eq!(released_via_drop(&events), 1, "{events:?}");
    force_idle();
}