// One knight, four teams. Only the cloth ramps swap. Steel, gold and
// leather keep their pixels, the way console games did palette swaps.
let cape = ["#3A0E2B", "#5A1236", "#A51D45", "#E02948", "#FF5B3E"];
let tabard = ["#14193F", "#1B2A6E", "#2C3F8F", "#3F5FC0"];

// A shading ramp from one hue: shadows drift cool, highlights warm.
fn ramp(hue, n) {
    let out = [];
    for i in 0..n {
        let t = i.to_float() / (n - 1).to_float();
        let h = (hue + 330.0 + 40.0 * t) % 360.0;
        out.push(color_from_hsl(h, 50.0 + 35.0 * t, 14.0 + 58.0 * t));
    }
    out
}

// name, cape hue, tabard hue.
let teams = [["moss", 105.0, 35.0], ["frost", 190.0, 265.0], ["ember", 30.0, 345.0]];
// The sheet is 2x2. Cell 0 keeps the original colors.
let cw = ps.doc_width() / 2;
let ch = ps.doc_height() / 2;

for t in 0..teams.len() {
    let team = teams[t];
    let swap = #{};
    let a = ramp(team[1], 5);
    let b = ramp(team[2], 4);
    for i in 0..5 { swap[cape[i]] = a[i]; }
    for i in 0..4 { swap[tabard[i]] = b[i]; }

    let x0 = (t + 1) % 2 * cw;
    let y0 = (t + 1) / 2 * ch;
    let n = 0;
    for y in y0..y0 + ch {
        for x in x0..x0 + cw {
            let c = ps.pixel_get(x, y);
            if c in swap {
                ps.pixel_set(x, y, swap[c]);
                n += 1;
            }
        }
    }
    print(`${team[0]}: ${n} px swapped`);
}

// A bone outline around the whole sheet, ready for a sticker export.
ps_filter_outline(1, "#E8E9F2");