htmlwave/test.html at master · nslowell/htmlwave · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>htmlwave tests</title>
<style>
body { font-family: monospace; margin: 20px; background: #1e1e1e; color: #d4d4d4; }
h1 { color: #569cd6; }
h2 { color: #9cdcfe; margin-top: 24px; }
.pass { color: #4ec9b0; }
.fail { color: #f44747; font-weight: bold; }
.summary { font-size: 16px; margin-top: 20px; padding: 10px; border: 1px solid #555; }
.detail { margin-left: 20px; font-size: 13px; color: #888; }
canvas { display: none; }
</style>
</head>
<body>
<h1>htmlwave rendering tests</h1>
<!-- Hidden canvas for CanvasWave (needs a real canvas for getBoundingClientRect) -->
<canvas id="testCanvas" width="800" height="400" style="display:none;"></canvas>
<div id="results"></div>

<script src="htmlwave.js"></script>
<script src="canvaswave.js"></script>
<script>
// canvaswave.js draw() references a bare global `context` (defined in htmlwave.html).
// Provide a stub so tests don't crash.
var context = { beginPath() {} };
// canvaswave.js draw() uses bare `sig` in a for-of loop (relies on global from htmlwave.html).
var sig;

// ============================================================================
// Minimal test framework
// ============================================================================
let totalTests = 0, passed = 0, failed = 0;
const results = document.getElementById('results');
let currentGroup = '';

// Catch unhandled errors.
window.onerror = function(msg, src, line, col, err) {
    const div = document.createElement('div');
    div.className = 'fail';
    div.textContent = '  \u2717 UNCAUGHT ERROR: ' + msg + ' at ' + src + ':' + line;
    results.appendChild(div);
    failed++;
    totalTests++;
};

function group(name) {
    currentGroup = name;
    const h = document.createElement('h2');
    h.textContent = name;
    results.appendChild(h);
}

function assert(condition, message) {
    totalTests++;
    const div = document.createElement('div');
    if (condition) {
        passed++;
        div.className = 'pass';
        div.textContent = '  \u2713 ' + message;
    } else {
        failed++;
        div.className = 'fail';
        div.textContent = '  \u2717 ' + message;
    }
    results.appendChild(div);
    return condition;
}

function assertEqual(actual, expected, message) {
    const ok = actual === expected;
    if (!ok) {
        assert(false, message + ' (expected: ' + JSON.stringify(expected) + ', got: ' + JSON.stringify(actual) + ')');
    } else {
        assert(true, message);
    }
}

function assertApprox(actual, expected, tolerance, message) {
    const ok = Math.abs(actual - expected) <= tolerance;
    if (!ok) {
        assert(false, message + ' (expected ~' + expected + ', got ' + actual + ')');
    } else {
        assert(true, message);
    }
}

function showSummary() {
    const div = document.createElement('div');
    div.className = 'summary ' + (failed > 0 ? 'fail' : 'pass');
    div.textContent = totalTests + ' tests: ' + passed + ' passed, ' + failed + ' failed';
    results.appendChild(div);
}

// ============================================================================
// Mock Canvas 2D context — records all drawing calls
// ============================================================================
class MockContext {
    constructor() {
        this.calls = [];
        this.lineWidth = 1;
        this.strokeStyle = '';
        this.fillStyle = '';
        this.font = '14px Courier New';
    }
    beginPath() { this.calls.push({ fn: 'beginPath' }); }
    moveTo(x, y) { this.calls.push({ fn: 'moveTo', x, y }); }
    lineTo(x, y) { this.calls.push({ fn: 'lineTo', x, y }); }
    stroke() { this.calls.push({ fn: 'stroke' }); }
    clearRect() { this.calls.push({ fn: 'clearRect' }); }
    fillText(txt, x, y) { this.calls.push({ fn: 'fillText', txt, x, y }); }
    measureText(txt) { return { width: txt.length * 8.4 }; } // Approximate monospace

    // Helpers for test inspection
    reset() { this.calls = []; }

    // Get all lineTo calls (the actual drawn lines — each preceded by a moveTo)
    get lines() {
        const lines = [];
        for (let i = 1; i < this.calls.length; i++) {
            if (this.calls[i].fn === 'lineTo' && this.calls[i-1].fn === 'moveTo') {
                lines.push({
                    x0: this.calls[i-1].x, y0: this.calls[i-1].y,
                    x1: this.calls[i].x,   y1: this.calls[i].y
                });
            }
            // Handle lineTo chained after lineTo (e.g. diamond: moveTo→lineTo→lineTo)
            if (this.calls[i].fn === 'lineTo' && this.calls[i-1].fn === 'lineTo') {
                lines.push({
                    x0: this.calls[i-1].x, y0: this.calls[i-1].y,
                    x1: this.calls[i].x,   y1: this.calls[i].y
                });
            }
        }
        return lines;
    }

    // Get horizontal lines at a specific y coordinate
    horizontalLinesAt(yCoord) {
        return this.lines.filter(l => l.y0 === yCoord && l.y1 === yCoord);
    }

    // Get all fillText calls
    get texts() {
        return this.calls.filter(c => c.fn === 'fillText');
    }
}

// Create a CanvasWave with a mock context for testing
function createTestViewer(wave, opts) {
    opts = opts || {};
    const width = opts.width || 800;
    const height = opts.height || 400;
    // Use the real canvas but override context
    const cnv = document.getElementById('testCanvas');
    cnv.width = width;
    cnv.height = height;
    // Force getBoundingClientRect to return our size
    cnv.getBoundingClientRect = () => ({ width, height, top: 0, left: 0 });

    const pal = { signal: '#ffffff', text: '#ffffff' };
    const cw = new CanvasWave(cnv, pal, wave);
    // Replace the context with our mock
    const mock = new MockContext();
    cw._context = mock;
    return { cw, mock };
}

// Build a simple multi-bit signal with specified transitions
function buildMultiBitWave(transitions, bitWidth) {
    // transitions = [ { time: 0, value: "b00001010" }, { time: 100, value: "b11110000" }, ... ]
    // Last entry's end time will be set to last time + 100
    bitWidth = bitWidth || 8;
    const wave = new Wave('ns');
    const sig = new Signal('test', 'T', bitWidth);
    wave.addSignal(sig);

    for (let i = 0; i < transitions.length; i++) {
        const t = transitions[i];
        const start = t.time;
        const end = (i + 1 < transitions.length) ? transitions[i + 1].time : t.time + 100;
        const sample = new Sample(start, end);
        sample.events.push(new Event(sig, t.value));
        wave.addSample(sample);
    }
    sig.advance(transitions[transitions.length - 1].time + 100);
    return { wave, sig };
}

// Build a single-bit signal with transitions
function buildSingleBitWave(transitions) {
    // transitions = [ { time: 0, value: "0" }, { time: 50, value: "1" }, ... ]
    const wave = new Wave('ns');
    const sig = new Signal('clk', 'C', 1);
    wave.addSignal(sig);

    for (let i = 0; i < transitions.length; i++) {
        const t = transitions[i];
        const start = t.time;
        const end = (i + 1 < transitions.length) ? transitions[i + 1].time : t.time + 100;
        const sample = new Sample(start, end);
        sample.events.push(new Event(sig, t.value));
        wave.addSample(sample);
    }
    sig.advance(transitions[transitions.length - 1].time + 100);
    return { wave, sig };
}


// ============================================================================
// TEST SUITE
// ============================================================================

// ---------- Segment value conversion ----------
group('Segment: value conversion');

(function() {
    // Binary display
    let s = new Segment("b10101010", 0, 100);
    s.mode = 0;
    assertEqual(s.value, "b10101010", "Binary mode returns raw binary value");

    // Decimal display (unsigned)
    s.mode = 1;
    assertEqual(s.value, "170", "Decimal mode: b10101010 = 170 unsigned");

    // Hex display
    s.mode = 2;
    assertEqual(s.value, "haa", "Hex mode: b10101010 = haa");
})();

(function() {
    // Decimal with all zeros
    let s = new Segment("b00000000", 0, 100);
    s.mode = 1;
    assertEqual(s.value, "0", "Decimal: b00000000 = 0");
})();

(function() {
    // Decimal with all ones (unsigned 8-bit)
    let s = new Segment("b11111111", 0, 100);
    s.mode = 1;
    assertEqual(s.value, "255", "Decimal unsigned: b11111111 = 255");
})();

(function() {
    // X and Z propagation
    let sx = new Segment("b1010xxxx", 0, 100);
    sx.mode = 1;
    assertEqual(sx.value, "X", "Decimal with x bits = X");

    let sz = new Segment("b1010zzzz", 0, 100);
    sz.mode = 1;
    assertEqual(sz.value, "Z", "Decimal with z bits = Z");
})();


// ---------- Signed integer conversion ----------
group('Segment: signed integer (two\'s complement)');

(function() {
    // Positive signed value: MSB = 0
    let s = new Segment("b01111111", 0, 100, 8);
    s.mode = 1;
    assertEqual(s.value, "127", "Signed 8-bit: 01111111 = +127");
})();

(function() {
    // Negative signed value: MSB = 1, 8-bit
    let s = new Segment("b11111111", 0, 100, 8);
    s.mode = 1;
    assertEqual(s.value, "-1", "Signed 8-bit: 11111111 = -1");
})();

(function() {
    // Signed: 10000000 = -128
    let s = new Segment("b10000000", 0, 100, 8);
    s.mode = 1;
    assertEqual(s.value, "-128", "Signed 8-bit: 10000000 = -128");
})();

(function() {
    // Signed 32-bit: all 1s = -1
    let bits = "b" + "1".repeat(32);
    let s = new Segment(bits, 0, 100, 32);
    s.mode = 1;
    assertEqual(s.value, "-1", "Signed 32-bit: all 1s = -1");
})();

(function() {
    // Signed 64-bit: large negative
    let bits = "b1" + "0".repeat(63);
    let s = new Segment(bits, 0, 100, 64);
    s.mode = 1;
    assertEqual(s.value, "-9223372036854775808", "Signed 64-bit: MSB only = -2^63");
})();

(function() {
    // Signed 64-bit: -1
    let bits = "b" + "1".repeat(64);
    let s = new Segment(bits, 0, 100, 64);
    s.mode = 1;
    assertEqual(s.value, "-1", "Signed 64-bit: all 1s = -1");
})();

(function() {
    // Unsigned (no signedWidth) 64-bit: all 1s = 2^64 - 1
    let bits = "b" + "1".repeat(64);
    let s = new Segment(bits, 0, 100, 0);
    s.mode = 1;
    assertEqual(s.value, "18446744073709551615", "Unsigned 64-bit: all 1s = 2^64-1");
})();


// ---------- String and real segments ----------
group('Segment: string and real types');

(function() {
    let s = new Segment("sHello World", 0, 100);
    assert(s.isString, "String segment: isString flag set");
    s.mode = 0;
    assertEqual(s.value, "Hello World", "String segment binary mode = raw text");
    s.mode = 1;
    assertEqual(s.value, "Hello World", "String segment decimal mode = raw text");
    s.mode = 2;
    assertEqual(s.value, "Hello World", "String segment hex mode = raw text");
})();

(function() {
    let s = new Segment("r3.14159", 0, 100);
    assert(s.isReal, "Real segment: isReal flag set");
    s.mode = 1;
    assertEqual(s.value, "3.14159", "Real segment value preserved");
})();


// ---------- Signal type detection ----------
group('Signal: type promotion');

(function() {
    let sig = new Signal('str', 'S1', 0);
    sig.addSegment(new Segment("sTest", 10, 20));
    assertEqual(sig.type, 'string', "Signal type promoted to 'string' on string segment");
})();

(function() {
    let sig = new Signal('flt', 'F1', 0);
    sig.addSegment(new Segment("r2.71828", 10, 20));
    assertEqual(sig.type, 'real', "Signal type promoted to 'real' on real segment");
})();

(function() {
    // Negative type = signed bit vector
    let sig = new Signal('speed', 'SP', -32);
    assertEqual(typeof sig.type, 'number', "Signed signal type is a number");
    assert(sig.type < 0, "Signed signal type is negative");
    assertEqual(Math.abs(sig.type), 32, "Signed signal width is abs(type)");
})();


// ---------- Signal: initial undefined segment ----------
group('Signal: initial undefined segment padding');

(function() {
    let sig = new Signal('bus', 'B', 8);
    sig.addSegment(new Segment("b00001111", 50, 100));
    assertEqual(sig.segs.length, 2, "Padding segment added when first segment starts after t=0");
    assertEqual(sig.segs[0].start, 0, "Padding segment starts at t=0");
    assertEqual(sig.segs[0].end, 50, "Padding segment ends at first segment start");
})();

(function() {
    // Signed signal should also get proper padding
    let sig = new Signal('sbus', 'SB', -16);
    sig.addSegment(new Segment("b0000000000001111", 50, 100));
    assertEqual(sig.segs.length, 2, "Signed signal gets padding segment");
    assertEqual(sig.segs[0].start, 0, "Signed padding starts at t=0");
})();


// ---------- VCD parsing ----------
group('VCD parsing');

(function() {
    let vcd = `$timescale 1ns $end
$scope module top $end
$var wire 1 ! clk $end
$var wire 8 " data [7:0] $end
$upscope $end
$enddefinitions $end
$dumpvars 0! b00000000 " $end
#50 1! $end
#100 0! b10101010 " $end
#150 1! $end
#200 $end`;

    let wave = read_vcd(vcd);
    assert(wave !== undefined, "VCD parsed successfully");
    assert(wave.signals.length > 0, "VCD has signals");
    assertEqual(wave.unit, 'ns', "VCD time unit is ns");
})();

(function() {
    // Integer VCD var type should be signed (negative type)
    let vcd = `$timescale 1ns $end
$scope module top $end
$var integer 32 ! speed $end
$upscope $end
$enddefinitions $end
$dumpvars b00000000000000000000000000000000 ! $end
#100 b11111111111111111111111111111111 ! $end
#200 $end`;

    let wave = read_vcd(vcd);
    let sigs = wave.signals[0].subs;
    assert(sigs.length > 0, "Integer signal parsed");
    let intSig = sigs[0];
    assert(intSig.type < 0, "Integer VCD type is negative (signed)");
    assertEqual(Math.abs(intSig.type), 32, "Integer bit width = 32");
})();


// ---------- CanvasWave: search_by_position ----------
group('CanvasWave: binary search');

(function() {
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00000001" },
        { time: 100, value: "b00000010" },
        { time: 200, value: "b00000011" },
        { time: 300, value: "b00000100" },
    ]);
    let { cw } = createTestViewer(wave);
    cw.add(sig);
    sig.clevel = 0; // Use uncompressed segments for search test

    let segs = sig.segs;
    let idx0 = cw.search_by_position(segs, 0);
    assertEqual(segs[idx0].start, 0, "search_by_position finds segment at t=0");

    let idx150 = cw.search_by_position(segs, 150);
    assert(segs[idx150].start <= 150 && segs[idx150].end >= 150,
        "search_by_position finds segment containing t=150");

    let idx399 = cw.search_by_position(segs, 399);
    assert(segs[idx399].start <= 399 && segs[idx399].end >= 399,
        "search_by_position finds segment containing t=399");
})();


// ---------- CanvasWave: multi-bit diamond transitions ----------
group('Rendering: multi-bit diamond transitions');

(function() {
    // Two different values should produce diamonds at the transition
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00001010" },
        { time: 200, value: "b11110000" },
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;  // Full view
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let lines = mock.lines;
    // There should be diagonal lines (y changes) for diamond transitions
    let diagonals = lines.filter(l => l.y0 !== l.y1);
    assert(diagonals.length > 0, "Diamond transitions produce diagonal lines");

    // Check no horizontal line crosses through a diamond region
    // (This was the overlap bug — horizontal value lines should not extend into diamond insets)
    let yTop = cw._top - cw._size;
    let yBot = cw._top + cw._size;
    let horizontalTop = lines.filter(l => l.y0 === yTop && l.y1 === yTop);
    let horizontalBot = lines.filter(l => l.y0 === yBot && l.y1 === yBot);

    // Find the transition x position
    let transX = cw.toPx(200);
    let corner = cw._corner;

    // No horizontal line should have its endpoint exactly at transX (the diamond tip)
    let overlapTop = horizontalTop.filter(l =>
        (l.x0 < transX && l.x1 > transX - corner && l.x1 >= transX) ||
        (l.x1 > transX && l.x0 < transX + corner && l.x0 <= transX)
    );
    let overlapBot = horizontalBot.filter(l =>
        (l.x0 < transX && l.x1 > transX - corner && l.x1 >= transX) ||
        (l.x1 > transX && l.x0 < transX + corner && l.x0 <= transX)
    );
    assert(overlapTop.length === 0, "No top horizontal line overlaps diamond transition zone");
    assert(overlapBot.length === 0, "No bottom horizontal line overlaps diamond transition zone");
})();


// ---------- Narrow segment guard ----------
group('Rendering: narrow segment guard (l0 >= l1)');

(function() {
    // Create transitions very close together so segment width < 2*corner (10px)
    // At 800px showing 0-400 time, each time unit = 2px
    // So a 4-time-unit segment = 8px < 10px (2*corner)
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00001010" },
        { time: 100, value: "b11110000" },
        { time: 104, value: "b00001010" },   // Only 4 units = 8px, both ends have diamonds
        { time: 200, value: "b11111111" },
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let yTop = cw._top - cw._size;
    let yBot = cw._top + cw._size;

    // Get horizontal lines in the narrow segment region (100-104 → 200px-208px in pixels)
    let narrowStart = cw.toPx(100);
    let narrowEnd = cw.toPx(104);
    let corner = cw._corner;

    // No horizontal line should go backward (x1 < x0) — that was the overlap bug
    let allHoriz = mock.lines.filter(l => l.y0 === l.y1);
    let backwards = allHoriz.filter(l => l.x1 < l.x0);
    assert(backwards.length === 0, "No backward horizontal lines (narrow segment guard works)");
})();


// ---------- Same-value segment merging ----------
group('Rendering: same-value segments (no false transitions)');

(function() {
    // Multiple segments with the same value should NOT produce transitions between them
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00001010" },
        { time: 100, value: "b00001010" },  // Same value
        { time: 200, value: "b00001010" },  // Same value
        { time: 300, value: "b11110000" },  // Different value
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let y = cw._top;
    // Diagonal lines = diamond transitions
    let diagonals = mock.lines.filter(l => l.y0 !== l.y1);

    // Count transitions — there should be diamonds only at the actual value change points:
    // start of first segment (x=0, entry diamond) and at t=300 (value change)
    // The segments at t=100 and t=200 with same value should NOT add new diamonds
    let transX100 = cw.toPx(100);
    let transX200 = cw.toPx(200);

    // No diagonal line should have its endpoint at x=transX100 or x=transX200
    // (those are same-value transitions and should be suppressed)
    let falseTransAt100 = diagonals.filter(l =>
        (Math.abs(l.x0 - transX100) <= 1 || Math.abs(l.x1 - transX100) <= 1) &&
        (l.y0 === y || l.y1 === y)  // goes through center y = diamond tip
    );
    let falseTransAt200 = diagonals.filter(l =>
        (Math.abs(l.x0 - transX200) <= 1 || Math.abs(l.x1 - transX200) <= 1) &&
        (l.y0 === y || l.y1 === y)
    );
    assert(falseTransAt100.length === 0, "No diamond transition at t=100 (same value as before)");
    assert(falseTransAt200.length === 0, "No diamond transition at t=200 (same value as before)");
})();


// ---------- Compression gap filling ----------
group('Rendering: compression gap filling');

(function() {
    // When compression merges segments, gaps appear.
    // The gap fill should connect value lines without overlapping diamonds.
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00001010" },
        { time: 500, value: "b11110000" },
        { time: 1000, value: "b00001010" },
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    // Basic sanity: drawing should produce lines
    assert(mock.lines.length > 0, "Compression gap fill: drawing produces lines");

    // No backward horizontal lines
    let allHoriz = mock.lines.filter(l => l.y0 === l.y1);
    let backwards = allHoriz.filter(l => l.x1 < l.x0);
    assert(backwards.length === 0, "Compression gap fill: no backward horizontal lines");
})();


// ---------- Single-bit rendering ----------
group('Rendering: single-bit signals');

(function() {
    let { wave, sig } = buildSingleBitWave([
        { time: 0, value: "0" },
        { time: 100, value: "1" },
        { time: 200, value: "0" },
        { time: 300, value: "1" },
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let y = cw._top;
    let yHigh = y - cw._size;
    let yLow  = y + cw._size;

    // Should have horizontal lines at yHigh (value=1) and yLow (value=0)
    let highLines = mock.horizontalLinesAt(yHigh);
    let lowLines = mock.horizontalLinesAt(yLow);
    assert(highLines.length > 0, "Single-bit: has horizontal lines at high level");
    assert(lowLines.length > 0, "Single-bit: has horizontal lines at low level");

    // Should have vertical transitions
    let verticals = mock.lines.filter(l => l.x0 === l.x1 && l.y0 !== l.y1);
    assert(verticals.length > 0, "Single-bit: has vertical transition lines");
})();

(function() {
    // Single-bit z value: should draw at center
    let { wave, sig } = buildSingleBitWave([
        { time: 0, value: "z" },
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let yCenter = cw._top;
    let centerLines = mock.horizontalLinesAt(yCenter);
    assert(centerLines.length > 0, "Single-bit z: draws horizontal line at center (hi-Z)");
})();


// ---------- Value text rendering ----------
group('Rendering: value text placement');

(function() {
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00001010" },
        { time: 400, value: "b11110000" },
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let texts = mock.texts;
    // Should have value labels (not just axis labels)
    // Filter to texts within the signal drawing area (y > 20)
    let sigTexts = texts.filter(t => t.y > 20);
    assert(sigTexts.length > 0, "Value text: signal values are drawn");

    // The value text should be the decimal representation (default mode)
    let found10 = sigTexts.some(t => t.txt === '10');
    let found240 = sigTexts.some(t => t.txt === '240');
    assert(found10 || found240, "Value text: correct decimal values displayed (10 or 240)");
})();

(function() {
    // Text should NOT appear at random positions — only at transitions
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00001010" },
        { time: 100, value: "b00001010" },  // Same value
        { time: 200, value: "b00001010" },  // Same value
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let sigTexts = mock.texts.filter(t => t.y > 20);
    // Only one value text for the entire same-value run (not three)
    let val10Texts = sigTexts.filter(t => t.txt === '10' || t.txt.startsWith('10'));
    assert(val10Texts.length <= 1, "Value text: only one text for same-value run (not per-segment)");
})();


// ---------- Signed signal rendering path ----------
group('Rendering: signed signals use multi-bit path');

(function() {
    // A signed signal (type = -8) should render through the multi-bit code path,
    // not the single-bit path (which would show hatching for unknown values)
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b01111111" },
        { time: 200, value: "b10000000" },
    ]);
    // Override the signal type to signed
    sig._type = -8;
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    // Should have diamond diagonal lines (multi-bit rendering)
    let y = cw._top;
    let diagonals = mock.lines.filter(l => l.y0 !== l.y1 && (l.y0 === y || l.y1 === y));
    assert(diagonals.length > 0, "Signed type renders through multi-bit path (has diamond diagonals)");

    // Should display decimal values
    let sigTexts = mock.texts.filter(t => t.y > 20);
    assert(sigTexts.length > 0, "Signed signal has value text labels");
})();


// ---------- String signal rendering ----------
group('Rendering: string signals');

(function() {
    let wave = new Wave('ns');
    let sig = new Signal('state', 'ST', 'string');
    wave.addSignal(sig);

    let s1 = new Sample(0, 200);
    s1.events.push(new Event(sig, "sIDLE"));
    wave.addSample(s1);

    let s2 = new Sample(200, 400);
    s2.events.push(new Event(sig, "sRUNNING"));
    wave.addSample(s2);

    sig.advance(400);

    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    // String signals should render through multi-bit path with diamonds
    let y = cw._top;
    let diagonals = mock.lines.filter(l => l.y0 !== l.y1 && (l.y0 === y || l.y1 === y));
    assert(diagonals.length > 0, "String signal renders with diamond transitions");

    // Should display the string value text
    let sigTexts = mock.texts.filter(t => t.y > 20);
    let hasIdle = sigTexts.some(t => t.txt.includes('IDLE'));
    let hasRunning = sigTexts.some(t => t.txt.includes('RUNNING'));
    assert(hasIdle || hasRunning, "String signal displays text value");
})();


// ---------- Real signal rendering ----------
group('Rendering: real signals');

(function() {
    let wave = new Wave('ns');
    let sig = new Signal('voltage', 'V', 'real');
    wave.addSignal(sig);

    let s1 = new Sample(0, 200);
    s1.events.push(new Event(sig, "r1.5"));
    wave.addSample(s1);

    let s2 = new Sample(200, 400);
    s2.events.push(new Event(sig, "r3.3"));
    wave.addSample(s2);

    sig.advance(400);

    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    // Real signals should render through multi-bit path
    let y = cw._top;
    let diagonals = mock.lines.filter(l => l.y0 !== l.y1 && (l.y0 === y || l.y1 === y));
    assert(diagonals.length > 0, "Real signal renders with diamond transitions");
})();


// ---------- Diamond overlap verification ----------
group('Rendering: diamond/horizontal overlap verification');

(function() {
    // Comprehensive overlap check: create many transitions and verify
    // no horizontal line ever starts or ends inside a diamond zone
    let transitions = [];
    for (let t = 0; t < 1000; t += 50) {
        transitions.push({ time: t, value: t % 100 === 0 ? "b00001010" : "b11110000" });
    }
    let { wave, sig } = buildMultiBitWave(transitions);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();

    let y = cw._top;
    let yTop = y - cw._size;
    let yBot = y + cw._size;
    let corner = cw._corner;

    // Find all transition x positions (where value changes)
    let transitionXs = [];
    for (let i = 1; i < transitions.length; i++) {
        if (transitions[i].value !== transitions[i-1].value) {
            transitionXs.push(cw.toPx(transitions[i].time));
        }
    }

    // Check horizontal lines don't overlap diamond zones
    let horizontals = mock.lines.filter(l => l.y0 === l.y1 && (l.y0 === yTop || l.y0 === yBot));
    let overlaps = 0;
    for (let h of horizontals) {
        for (let tx of transitionXs) {
            // A horizontal line overlaps if it crosses through the diamond zone [tx-corner, tx+corner]
            // i.e., one endpoint is outside and the other is inside or past the zone
            let hLeft = Math.min(h.x0, h.x1);
            let hRight = Math.max(h.x0, h.x1);
            if (hLeft < tx - corner && hRight > tx - corner && hRight <= tx + corner) {
                overlaps++;
            }
            if (hRight > tx + corner && hLeft < tx + corner && hLeft >= tx - corner) {
                overlaps++;
            }
            // Or the line passes completely through the diamond
            if (hLeft < tx - corner && hRight > tx + corner) {
                overlaps++;
            }
        }
    }
    assertEqual(overlaps, 0, "Many-transition stress test: zero horizontal/diamond overlaps");
})();


// ---------- Edge cases ----------
group('Edge cases');

(function() {
    // Empty wave (just one segment)
    let { wave, sig } = buildMultiBitWave([
        { time: 0, value: "b00000000" },
    ]);
    let { cw, mock } = createTestViewer(wave, { width: 800 });
    cw.add(sig);
    cw.zoom = 0;
    cw.position = 0;
    cw.clear();
    mock.reset();
    cw.draw();
    assert(mock.lines.length > 0, "Single segment renders without error");
})();

(function() {
    // Signal starting after t=0
    let wave = new Wave('ns');
    let sig = new Signal('late', 'L', 8);
    wave.addSignal(sig);
    let s = new Sample(500, 1000);
    s.events.push(new Event(sig, "b11001100"));
    wave.addSample(s);
    sig.advance(1000);

    assertEqual(sig.segs.length, 2, "Late-starting signal has padding + data segment");
    assertEqual(sig.segs[0].start, 0, "Padding fills from t=0");
    assertEqual(sig.segs[0].end, 500, "Padding ends at first event");
})();

(function() {
    // Default display mode is decimal (mode=1)
    let s = new Segment("b11001100", 0, 100);
    assertEqual(s.mode, 1, "Default segment mode is decimal (1)");
    assertEqual(s.value, "204", "Default display value is decimal");
})();


// ============================================================================
showSummary();
</script>
</body>
</html>