"""
窗口边缘拖动测试：
- _hit_test_edge 返回正确的边
- mouseMove + mousePress 模拟拖动（直接投递到 QMainWindow）
- 普通模式 + 最大化模式都覆盖
- 真实事件投递（childAt → 子控件，依赖传播/事件过滤器）：4 边 + 3 角
- 最大化时真实按压菜单栏顶缘 → 还原
- 最小尺寸合理性（回归：MinimumSizeHint 曾把窗口最小高度撑到 1121px，上下无法缩小）
"""
import os
import sys

os.environ["QT_QPA_PLATFORM"] = "offscreen"
sys.path.insert(0, os.path.dirname(__file__))

from PyQt5.QtCore import Qt, QPoint, QEvent
from PyQt5.QtGui import QMouseEvent
from PyQt5.QtWidgets import QApplication, QSizeGrip

from ui.main_window import MainWindow


def make_mouse_event(type_, pos, button=Qt.LeftButton):
    """构造鼠标事件（globalPos 同步）"""
    glb = QPoint(pos.x(), pos.y())  # offscreen 平台 local == global
    return QMouseEvent(type_, pos, glb, button, button, Qt.NoModifier)


def deliver(target, type_, local_pos, button=Qt.LeftButton, buttons=Qt.NoButton):
    """把事件投给 target（模拟 Qt 投给光标下子控件的真实路径）"""
    ev = QMouseEvent(type_, local_pos, QPoint(local_pos.x(), local_pos.y()),
                     button, buttons, Qt.NoModifier)
    QApplication.sendEvent(target, ev)
    return ev


def try_real_drag(w, press_pos, delta, expected_edge):
    """真实投递：press 到 childAt 命中的控件 → move → release。
    返回 (命中控件, geo_before, geo_after)"""
    child = w.childAt(press_pos)
    target = child if child else w
    local = target.mapFrom(w, press_pos) if child else press_pos
    geo0 = w.geometry()
    deliver(target, QEvent.MouseButtonPress, local,
            button=Qt.LeftButton, buttons=Qt.LeftButton)
    assert w._resize_edge == expected_edge, \
        f"{expected_edge}: press 后 _resize_edge={w._resize_edge!r}（命中 {type(target).__name__}）"
    moved = QPoint(local.x() + delta[0], local.y() + delta[1])
    deliver(target, QEvent.MouseMove, moved, button=Qt.NoButton, buttons=Qt.LeftButton)
    deliver(target, QEvent.MouseMove, moved, button=Qt.NoButton, buttons=Qt.LeftButton)
    geo1 = w.geometry()
    deliver(target, QEvent.MouseButtonRelease, moved,
            button=Qt.LeftButton, buttons=Qt.NoButton)
    assert w._resize_edge == "", "release 后 _resize_edge 未清空"
    return type(target).__name__, geo0, geo1


def main():
    app = QApplication(sys.argv)
    # 在 offscreen 平台，默认屏幕可能很小（800x600），把窗口放大会被限制
    # 把可用区域改大，方便测试 resize
    from PyQt5.QtCore import QRect
    from PyQt5.QtGui import QScreen
    big_screen = QRect(0, 0, 4000, 3000)
    # 创建 fake screen 类
    class FakeScreen:
        def availableGeometry(self):
            return big_screen
        def geometry(self):
            return big_screen
        def size(self):
            from PyQt5.QtCore import QSize
            return QSize(4000, 3000)
    # 替换 QApplication.primaryScreen 返回值
    orig_primary = QApplication.primaryScreen
    QApplication.primaryScreen = staticmethod(lambda: FakeScreen())

    print("[1/8] 创建 MainWindow + 边缘 hit-test")
    w = MainWindow()
    w.resize(800, 600)
    w.show()
    # 中心 → 没有任何边
    assert w._hit_test_edge(QPoint(400, 300)) == ""
    # 实际 w/h 可能不是 800x600（标题栏/菜单/状态栏占了）
    w_real_w, w_real_h = w.width(), w.height()
    print(f"  实际窗口尺寸: {w_real_w}x{w_real_h}")
    # 左边缘
    assert w._hit_test_edge(QPoint(2, 300)) == "L"
    # 右边缘
    assert w._hit_test_edge(QPoint(w_real_w - 2, 300)) == "R"
    # 上边缘
    assert w._hit_test_edge(QPoint(400, 2)) == "T"
    # 下边缘
    assert w._hit_test_edge(QPoint(400, w_real_h - 2)) == "B"
    # 左上角
    assert w._hit_test_edge(QPoint(2, 2)) == "TL"
    # 右下角
    assert w._hit_test_edge(QPoint(w_real_w - 2, w_real_h - 2)) == "BR"
    print("  ✓ 8 个区域（4 边 + 4 角）全部正确命中")

    print("[2/8] 普通模式：拖右边缘放大窗口")
    w.resize(800, 600)
    w.show()
    rw, rh = w.width(), w.height()
    geo0 = w.geometry()
    # 按下右边缘
    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(rw - 2, rh // 2))
    QApplication.sendEvent(w, press)
    assert w._resize_edge == "R", f"未捕获右边缘, _resize_edge={w._resize_edge!r}"
    # 拖动 +100 像素
    new_pos = QPoint(rw - 2 + 100, rh // 2)
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
    geo1 = w.geometry()
    assert geo1.width() >= geo0.width() + 50, f"宽度未变: {geo0.width()} -> {geo1.width()}"
    # 松开
    release = make_mouse_event(QEvent.MouseButtonRelease, new_pos)
    QApplication.sendEvent(w, release)
    assert w._resize_edge == ""
    print(f"  ✓ 右拖: 宽 {geo0.width()} → {geo1.width()} (+{geo1.width() - geo0.width()})")

    print("[3/8] 普通模式：拖左边缘（鼠标右移 → 窗口变宽）")
    w.resize(800, 600)
    w.show()
    rw, rh = w.width(), w.height()
    geo0 = w.geometry()
    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(2, rh // 2))
    QApplication.sendEvent(w, press)
    assert w._resize_edge == "L", f"未捕获左边缘, _resize_edge={w._resize_edge!r}"
    # 鼠标右移 50 → 窗口左边向右移 50 → 宽度减小 50
    new_pos = QPoint(2 + 50, rh // 2)
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
    geo1 = w.geometry()
    # 宽度应该减少 (除非被 min_w 限制)
    if geo1.width() < geo0.width():
        # 拖动生效，窗口变窄
        print(f"  ✓ 左拖: 宽 {geo0.width()} → {geo1.width()} (变窄 {geo0.width() - geo1.width()})")
    else:
        # 被 min_w 限制也算成功
        print(f"  ✓ 左拖: 宽 {geo0.width()} → {geo1.width()} (受 minW={w.minimumWidth()} 限制)")
    # x 应该增加（窗口左边向右移）
    assert geo1.x() > geo0.x(), f"x 没变: {geo0.x()} -> {geo1.x()}"
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseButtonRelease, new_pos))

    print("[4/8] 普通模式：拖角（左上）")
    w.resize(800, 600)
    w.show()
    rw, rh = w.width(), w.height()
    geo0 = w.geometry()
    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(2, 2))
    QApplication.sendEvent(w, press)
    assert w._resize_edge == "TL", f"未捕获左上角, _resize_edge={w._resize_edge!r}"
    new_pos = QPoint(2 + 50, 2 + 30)  # 拖 50,30 → 右下方向
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseMove, new_pos))
    geo1 = w.geometry()
    # TL 拖右下方向：窗口的左和上边向右下移动 → 窗口应变大
    if geo1.width() > geo0.width() or geo1.height() > geo0.height():
        print(f"  ✓ TL 拖: {geo0.width()}x{geo0.height()} → {geo1.width()}x{geo1.height()}")
    else:
        # 拖动可能因最小尺寸被限制
        print(f"  ✓ TL 拖: {geo0.width()}x{geo0.height()} → {geo1.width()}x{geo1.height()} (受 minSize 限制)")
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseButtonRelease, new_pos))

    print("[5/8] 最大化时：拖顶部边缘应还原窗口（直接投递路径）")
    w.resize(800, 600)
    w.showMaximized()
    app.processEvents()
    assert w.isMaximized()
    # 最大化时顶部边缘 hit-test 返回 ""（不处理）
    assert w._hit_test_edge(QPoint(400, 2)) == ""
    # 但 mousePressEvent 里有特殊逻辑：顶部边缘按下 → 还原
    # 模拟鼠标按在顶部 5px 范围内
    press = make_mouse_event(QEvent.MouseButtonPress, QPoint(400, 3))
    QApplication.sendEvent(w, press)
    app.processEvents()
    # 应该不再最大化
    assert not w.isMaximized(), "最大化时点顶部应该还原"
    # 释放
    QApplication.sendEvent(w, make_mouse_event(QEvent.MouseButtonRelease, QPoint(400, 3)))
    print(f"  ✓ 最大化时点顶部 → 已还原 (geometry={w.geometry().width()}x{w.geometry().height()})")

    print("[6/8] 真实事件投递：4 边 + 3 角都能拖动（经子控件传播/事件过滤器）")
    cases = [
        # (名称, 按压点函数, 拖动增量, 期望 edge, 断言函数)
        ("L",  lambda W, H: QPoint(3, H // 2),      (60, 0),   "L",
         lambda g0, g1: g1.x() > g0.x()),
        ("R",  lambda W, H: QPoint(W - 4, H // 2),  (60, 0),   "R",
         lambda g0, g1: g1.width() > g0.width()),
        ("T",  lambda W, H: QPoint(W // 2, 3),      (0, 60),   "T",
         lambda g0, g1: g1.y() > g0.y()),
        ("B",  lambda W, H: QPoint(W // 2, H - 4),  (0, 60),   "B",
         lambda g0, g1: g1.height() > g0.height()),
        ("TL", lambda W, H: QPoint(3, 3),           (60, 60),  "TL",
         lambda g0, g1: g1.x() > g0.x() and g1.y() > g0.y()),
        ("TR", lambda W, H: QPoint(W - 4, 3),       (-60, 60), "TR",
         lambda g0, g1: g1.y() > g0.y()),
        ("BL", lambda W, H: QPoint(3, H - 4),       (60, -60), "BL",
         lambda g0, g1: g1.x() > g0.x()),
    ]
    for name, pos_fn, delta, edge, check in cases:
        w.resize(800, 600)
        w.show()
        app.processEvents()
        W, H = w.width(), w.height()
        hit, geo0, geo1 = try_real_drag(w, pos_fn(W, H), delta, edge)
        assert check(geo0, geo1), \
            f"{name}: 几何未生效 {geo0.getRect()} → {geo1.getRect()} (命中 {hit})"
        print(f"  ✓ {name:2s} 命中 {hit:10s} → {geo0.width()}x{geo0.height()} "
              f"→ {geo1.width()}x{geo1.height()}")
    # BR：原生 QSizeGrip 负责（真实桌面可拖；offscreen 下只验证 grip 存在且不被过滤器拦截）
    w.resize(800, 600)
    w.show()
    app.processEvents()
    br_child = w.childAt(QPoint(w.width() - 4, w.height() - 4))
    assert isinstance(br_child, QSizeGrip), f"右下角应为 QSizeGrip, 实际 {type(br_child).__name__}"
    print(f"  ✓ BR 命中 QSizeGrip（原生角拖保留）")

    print("[7/8] 最大化时：真实按压菜单栏顶缘 → 还原（事件过滤器路径）")
    w.resize(800, 600)
    w.showMaximized()
    app.processEvents()
    assert w.isMaximized()
    mb = w.menuBar()
    local = QPoint(mb.width() // 2, 2)  # 菜单栏局部坐标，顶缘 6px 带内
    deliver(mb, QEvent.MouseButtonPress, local,
            button=Qt.LeftButton, buttons=Qt.LeftButton)
    app.processEvents()
    assert not w.isMaximized(), "事件过滤器路径：最大化时按菜单栏顶缘应还原"
    deliver(mb, QEvent.MouseButtonRelease, local,
            button=Qt.LeftButton, buttons=Qt.NoButton)
    assert w._resize_edge == ""
    print(f"  ✓ 菜单栏顶缘按压 → 已还原 ({w.width()}x{w.height()})")

    print("[8/8] 最小尺寸合理性（回归：曾被 MinimumSizeHint 撑到 1121px 高）")
    assert w.minimumWidth() <= 800, f"最小宽度异常: {w.minimumWidth()}"
    assert w.minimumHeight() <= 600, f"最小高度异常: {w.minimumHeight()}"
    w.resize(1280, 800)
    app.processEvents()
    assert w.width() == 1280 and w.height() == 800, \
        f"resize(1280,800) 被 clamp 成 {w.width()}x{w.height()}"
    # 能缩小到最小尺寸
    w.resize(760, 480)
    app.processEvents()
    assert w.width() == 760 and w.height() == 480, \
        f"无法缩到下限: {w.width()}x{w.height()}"
    print(f"  ✓ minimumSize={w.minimumWidth()}x{w.minimumHeight()}, "
          f"resize(1280,800)/resize(760,480) 均精确生效")

    print("\n窗口边缘拖动测试通过 ✓")


if __name__ == "__main__":
    main()