reasampler/tests/test_overflow_menu.cpp

// Standalone tests for reasampler::overflow_menu — no REAPER, no test framework. Same fast
// loop as the sibling pure tests (prune_button / mode_switch): assert the top-toolbar More
// ("⋯") button placement, the action-bar reserve, and hit-testing directly.
//
// Covers (L5 refinement 1 pure module): right-anchored layout in a wide band; the reserve the
// action_bar must leave (width + 2*rightInset); vertical inset; thin-band height clamp;
// SUPPRESSION (empty rect) when the band is too narrow to clear the left inset or is degenerate;
// a degenerate band reserves nothing; hit-test in/out/edge (half-open bounds); an empty button
// claims no point; draw and hit-test agree over the whole rect.

#include "../src/overflow_menu.h"

#include <cstdio>

using namespace reasampler;

static int g_fail = 0;
#define CHECK(cond) do { if(!(cond)) { \
    std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)

// --- Layout: wide band, right-anchored ---------------------------------------

// Band 400 wide at origin (0, 0), height 40. Default spec: buttonWidth 28, rightInset 6,
// verticalInset 3, minLeftInset 40. Right edge = 0+400-6 = 394, left = 394-28 = 366
// (>= 0+40, placed). Top = 0+3 = 3, height = 40-6 = 34.
static void testWideBandRightAnchored() {
    MenuBarRect bar{0, 0, 400, 40};
    const MenuButtonRect b = computeMenuButton(bar, MenuButtonSpec{});
    CHECK(!b.empty());
    CHECK((b == MenuButtonRect{366, 3, 28, 34}));
    CHECK(b.x + b.width == bar.x + bar.width - 6);   // right edge at rightInset
    CHECK(b.x >= bar.x + 40);                         // clears the left inset
}

// Origin offset honoured (button anchors to THIS band's right).
static void testOffsetBandAnchors() {
    MenuBarRect bar{10, 5, 400, 40};
    const MenuButtonRect b = computeMenuButton(bar, MenuButtonSpec{});
    CHECK(!b.empty());
    CHECK(b.x + b.width == bar.x + bar.width - 6);   // = 10+400-6 = 404
    CHECK(b.y == 8);                                 // 5 + 3
}

// --- Reserve -----------------------------------------------------------------

// The reserve = buttonWidth + 2*rightInset so the frequent buttons get a right gap AND a left
// breathing gap before the menu button. Default: 28 + 2*6 = 40.
static void testReserve() {
    MenuBarRect bar{0, 0, 400, 40};
    CHECK(menuButtonReserve(bar, MenuButtonSpec{}) == 40);
}

// A degenerate band reserves nothing (no button to reserve for).
static void testDegenerateBandReservesNothing() {
    CHECK(menuButtonReserve(MenuBarRect{0, 0, 0, 40}, MenuButtonSpec{}) == 0);
    CHECK(menuButtonReserve(MenuBarRect{0, 0, 400, 0}, MenuButtonSpec{}) == 0);
    MenuButtonSpec zero{}; zero.buttonWidth = 0;
    CHECK(menuButtonReserve(MenuBarRect{0, 0, 400, 40}, zero) == 0);
}

// --- Suppression: too narrow / degenerate ------------------------------------

// The button is suppressed when its left edge would fall past minLeftInset. left = x + width -
// rightInset - buttonWidth. Need left < x + minLeftInset ->
// width < rightInset + buttonWidth + minLeftInset = 6 + 28 + 40 = 74. Width 73 suppresses; 74
// places (boundary).
static void testNarrowBandSuppressed() {
    CHECK(computeMenuButton(MenuBarRect{0, 0, 73, 40}, MenuButtonSpec{}).empty());
    CHECK(!computeMenuButton(MenuBarRect{0, 0, 74, 40}, MenuButtonSpec{}).empty());
}

static void testDegenerateBandSuppressed() {
    CHECK(computeMenuButton(MenuBarRect{0, 0, 0, 40}, MenuButtonSpec{}).empty());
    CHECK(computeMenuButton(MenuBarRect{0, 0, 400, 0}, MenuButtonSpec{}).empty());
    MenuButtonSpec zero{}; zero.buttonWidth = 0;
    CHECK(computeMenuButton(MenuBarRect{0, 0, 400, 40}, zero).empty());
}

// A thin band (height <= 2*verticalInset) still places a button, clamped to the band's height.
static void testThinBandClampsHeight() {
    MenuBarRect bar{0, 0, 400, 4};  // 4 <= 2*3, so height would be negative -> clamp
    const MenuButtonRect b = computeMenuButton(bar, MenuButtonSpec{});
    CHECK(!b.empty());
    CHECK(b.y == bar.y);
    CHECK(b.height == bar.height);
}

// --- Hit-test ----------------------------------------------------------------

static void testHitTestInside() {
    MenuBarRect bar{0, 0, 400, 40};
    const MenuButtonRect b = computeMenuButton(bar, MenuButtonSpec{});  // {366,3,28,34}
    CHECK(hitTestMenuButton(b.x, b.y, b));                              // top-left inclusive
    CHECK(hitTestMenuButton(b.x + b.width - 1, b.y + b.height - 1, b)); // bottom-right inclusive
    CHECK(hitTestMenuButton(b.x + b.width / 2, b.y + b.height / 2, b)); // centre
}

static void testHitTestEdgesExcluded() {
    MenuBarRect bar{0, 0, 400, 40};
    const MenuButtonRect b = computeMenuButton(bar, MenuButtonSpec{});
    CHECK(!hitTestMenuButton(b.x - 1, b.y, b));            // just left
    CHECK(!hitTestMenuButton(b.x + b.width, b.y, b));      // right edge excluded
    CHECK(!hitTestMenuButton(b.x, b.y - 1, b));            // just above
    CHECK(!hitTestMenuButton(b.x, b.y + b.height, b));     // bottom edge excluded
}

// An empty/suppressed button claims no point — a click where it would be falls through.
static void testEmptyButtonClaimsNothing() {
    MenuButtonRect empty{};
    CHECK(!hitTestMenuButton(0, 0, empty));
    const MenuButtonRect suppressed = computeMenuButton(MenuBarRect{0, 0, 50, 40}, MenuButtonSpec{});
    CHECK(suppressed.empty());
    CHECK(!hitTestMenuButton(30, 20, suppressed));
}

// Draw/hit-test agreement over the whole rect + the four immediate outside neighbours.
static void testHitTestMatchesLayout() {
    MenuBarRect bar{3, 7, 377, 38};  // awkward origin/size
    const MenuButtonRect b = computeMenuButton(bar, MenuButtonSpec{});
    CHECK(!b.empty());
    for (int py = b.y; py < b.y + b.height; ++py)
        for (int px = b.x; px < b.x + b.width; ++px)
            CHECK(hitTestMenuButton(px, py, b));
    CHECK(!hitTestMenuButton(b.x - 1, b.y, b));
    CHECK(!hitTestMenuButton(b.x + b.width, b.y, b));
}

int main() {
    testWideBandRightAnchored();
    testOffsetBandAnchors();
    testReserve();
    testDegenerateBandReservesNothing();
    testNarrowBandSuppressed();
    testDegenerateBandSuppressed();
    testThinBandClampsHeight();
    testHitTestInside();
    testHitTestEdgesExcluded();
    testEmptyButtonClaimsNothing();
    testHitTestMatchesLayout();

    if (g_fail == 0) std::printf("overflow_menu: all tests passed\n");
    else std::printf("overflow_menu: %d CHECK(s) FAILED\n", g_fail);
    return g_fail == 0 ? 0 : 1;
}