#!/usr/bin/env python3
# Generate the install-window background for the Eleven DMG.
# Renders at 2x (retina) then downsamples for the 1x rep, so both are crisp.
import os
from PIL import Image, ImageDraw, ImageFont

OUT = os.path.dirname(os.path.abspath(__file__))
S = 2                       # supersample / retina factor
W, H = 640 * S, 400 * S

# Purple sampled from the app icon (AppIcon icon_1024, core of the violet
# gradient) so the "Eleven" wordmark matches the logo exactly.
PURPLE   = (101, 64, 208)   # #6540D0 — wordmark
GREY     = (150, 155, 168)  # the count numbers — light grey, regular weight
DOT_GREY = (200, 203, 214)  # faint separators / arrow-lighter
DARK     = (28, 30, 42)
MUTED    = (122, 126, 140)
GRAD_TOP = (252, 252, 255)
GRAD_BOT = (235, 237, 249)


def font(size, bold=False):
    size = int(size * S)
    # Prefer SF Pro (variable font — pick the Bold instance); fall back to Arial.
    try:
        f = ImageFont.truetype("/System/Library/Fonts/SFNS.ttf", size)
        if bold:
            try:
                f.set_variation_by_name("Bold")
            except Exception:
                pass
        return f
    except Exception:
        p = "/System/Library/Fonts/Supplemental/Arial Bold.ttf" if bold \
            else "/System/Library/Fonts/Supplemental/Arial.ttf"
        return ImageFont.truetype(p, size)


# --- base gradient ---
img = Image.new("RGB", (W, H), GRAD_TOP)
d = ImageDraw.Draw(img)
for y in range(H):
    t = y / (H - 1)
    d.line([(0, y), (W, y)], fill=tuple(
        int(a + (b - a) * t) for a, b in zip(GRAD_TOP, GRAD_BOT)))
d = ImageDraw.Draw(img)

# --- the count: 1 · 2 · … · 10 →  (light grey, regular, on the icon line) ---
row_y = 208 * S
num_font = font(14.5)               # match the "Drag the app…" subtitle — one body size
arrow_font = num_font               # the → is the same size as the numbers (no size-mixing)
inter = 2 * S                       # tight spacing between tokens
arrow_gap = 7 * S                   # a little breathing room before the arrow

parts = []                          # (text, font, colour)
for i in range(1, 11):
    parts.append((str(i), num_font, GREY))
    if i < 10:
        parts.append(("·", num_font, DOT_GREY))
widths = [d.textlength(t, font=f) for (t, f, _) in parts]
arrow_w = d.textlength("→", font=arrow_font)
total = sum(widths) + inter * (len(parts) - 1) + arrow_gap + arrow_w
x = W / 2 - total / 2
for (t, f, c), w in zip(parts, widths):
    d.text((x, row_y), t, font=f, fill=c, anchor="lm")
    x += w + inter
x = x - inter + arrow_gap
d.text((x, row_y), "→", font=arrow_font, fill=GREY, anchor="lm")

# --- title ---
title_r = font(27, bold=True)
ty = 62 * S
seg1, seg2 = "Install ", "Eleven"
w1 = d.textlength(seg1, font=title_r)
w2 = d.textlength(seg2, font=title_r)
sx = (W - (w1 + w2)) / 2
d.text((sx, ty), seg1, font=title_r, fill=DARK, anchor="lm")
d.text((sx + w1, ty), seg2, font=title_r, fill=PURPLE, anchor="lm")

# --- subtitle ---
sub = font(14.5)
d.text((W / 2, 98 * S), "Drag the app into your Applications folder",
       font=sub, fill=MUTED, anchor="mm")

img.save(os.path.join(OUT, "background@2x.png"))
img.resize((W // S, H // S), Image.LANCZOS).save(os.path.join(OUT, "background.png"))
print("wrote background.png (%dx%d) + background@2x.png (%dx%d)" %
      (W // S, H // S, W, H))