let colors = {};
let rasterized = {};

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 rasterize_and_pack(text, cycles) {
    // TODO: handle texture is full or stuff don't fit (unlikely)

    const key = text + '@' + cycles;

    if (key in rasterized) {
        return rasterized[key];
    }

    const tiles_needed = cycles - 1 + 1; // stage name + count from one
    if (tiles_needed > config.raster_texture_size / config.w - raster_tile.x) {
        raster_tile.x = 0;
        raster_tile.y += 1;
    }

    const u = raster_tile.x * config.w / config.raster_texture_size;
    const v = raster_tile.y * config.h / config.raster_texture_size;

    rasterize(text);    
    gl.bindTexture(gl.TEXTURE_2D, textures['raster']);
    gl.texSubImage2D(gl.TEXTURE_2D, 0, 
        raster_tile.x * config.w, raster_tile.y * config.h, 
        config.w, config.h, 
        gl.RGBA, gl.UNSIGNED_BYTE, c2d.canvas
    );
    raster_tile.x += 1;

    for (let i = 1; i <= cycles; ++i) {
        rasterize(i);    
        gl.bindTexture(gl.TEXTURE_2D, textures['raster']);
        gl.texSubImage2D(gl.TEXTURE_2D, 0, 
            raster_tile.x * config.w, raster_tile.y * config.h, 
            config.w, config.h, 
            gl.RGBA, gl.UNSIGNED_BYTE, c2d.canvas
        );
        raster_tile.x += 1;
    }

    if (raster_tile.x === config.raster_texture_size / config.w) {
        raster_tile.x = 0;
        raster_tile.y += 1;
    }

    rasterized[key] = [u, v];

    return [u, v];
}

function generate(trace_id) {
    const before = performance.now();

    const result = {
        'count': 0,
    };

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

    let instructions = {};

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

    let y = 0;

    for (const id in instructions) {
        const instruction = instructions[id];
        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);
            }

            const [u, v] = rasterize_and_pack(stage.name, stage_cycles);

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

            result.count++;

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

        ++y;
    }

    if (false) {
        result.pos = new Float32Array([0, 0]);
        result.size = new Float32Array([config.raster_texture_size, config.raster_texture_size]);
        result.color = new Uint8Array([0, 0, 0, 255]);
        result.uv = new Float32Array([0, 0]);
        result.count = 1;
    } else {
        result.pos = new Float32Array(positions);
        result.size = new Float32Array(sizes);
        result.color = new Uint8Array(colors);
        result.uv = new Float32Array(uvs);
    }

    const after = performance.now();

    console.log(`Generated geometry in ${Math.round(after - before)}ms`);

    return result;
}