let colors = {};

function get_color(stage_name) {
    if (stage_name in config.predefined_colors) {
        return config.predefined_colors[stage_name];
    }

    if (stage_name in colors) {
        return colors[stage_name];
    }

    const r = Math.floor(Math.random() * 155);
    const g = Math.floor(Math.random() * 155);
    const b = Math.floor(Math.random() * 155);

    colors[stage_name] = [ 100 + r, 100 + g, 100 + b ];

    return colors[stage_name];
}

function generate(trace_id) {
    const result = {
        'count': 0,
    };

    const positions = [];
    const sizes = [];
    const colors = [];

    let instructions = [];

    if (trace_id in traces) {
        instructions = traces[trace_id];
    }

    console.log(instructions);

    let y = 0;

    for (const instruction of instructions) {
        for (let i = 0; i < instruction.lanes['0'].length; ++i) {
            const stage = instruction.lanes['0'][i];
            let stage_cycles;

            if (i < instruction.lanes['0'].length - 1) {
                const next_stage = instruction.lanes['0'][i + 1];
                stage_cycles = next_stage.c - stage.c;
            } else {
                stage_cycles = instruction.retcyc - stage.c;
            }

            let [r, g, b] = get_color(stage.name);

            if (!instruction.retired) {
                r = Math.max(50, r - 50);
                g = Math.max(50, g - 50);
                b = Math.max(50, b - 50);
            }

            sizes.push(stage_cycles * config.w, 1 * config.h);
            positions.push(config.w * stage.c, config.h * y); 
            colors.push(r, g, b, 255);

            result.count++;

            if (config.limit > 0 && result.count >= config.limit) {
                break;
            }
        }

        ++y;
    }

    result.pos = new Float32Array(positions);
    result.size = new Float32Array(sizes);
    result.color = new Uint8Array(colors);

    return result;
}