#!/usr/bin/env python3
"""Genera le icone dell'app in stile Sailfish OS:
   sfondo a gradiente azzurro->blu con angoli molto arrotondati,
   libro aperto bianco con ombra morbida e righe di testo tenui.
   Dimensioni: 86, 108, 128, 172 (struttura standard hicolor)."""
import os
from PIL import Image, ImageDraw

# gradiente Sailfish: azzurro chiaro (alto) -> blu profondo (basso)
C_TOP = (94, 210, 240)     # #5ED2F0
C_BOT = (14, 111, 168)     # #0E6FA8
PAGE = (255, 255, 255)
TEXT = (120, 190, 225)     # righe del testo, tenue
SPINE = (200, 225, 240)


def gradient(size, c1, c2):
    img = Image.new("RGB", (size, size))
    d = ImageDraw.Draw(img)
    for y in range(size):
        t = y / (size - 1)
        d.line([(0, y), (size, y)],
               fill=(int(c1[0] + (c2[0] - c1[0]) * t),
                     int(c1[1] + (c2[1] - c1[1]) * t),
                     int(c1[2] + (c2[2] - c1[2]) * t)))
    return img


def draw_icon(size):
    m = size * 0.05
    r = size * 0.22
    out = Image.new("RGBA", (size, size), (0, 0, 0, 0))

    # sfondo: gradiente ritagliato nel rounded rect
    grad = gradient(size, C_TOP, C_BOT).convert("RGBA")
    mask = Image.new("L", (size, size), 0)
    ImageDraw.Draw(mask).rounded_rectangle([m, m, size - m, size - m],
                                           radius=r, fill=255)
    out.paste(grad, (0, 0), mask)

    d = ImageDraw.Draw(out)

    cx = size / 2
    top = size * 0.33
    bot = size * 0.66
    half = size * 0.15
    ol = size * 0.24
    orr = size * 0.76

    def pages():
        return ([(cx - half, top), (cx, top), (cx, bot), (ol, bot + size * 0.035)],
                [(cx, top), (cx + half, top), (orr, bot + size * 0.035), (cx, bot)])

    lp, rp = pages()
    # ombra morbida sotto il libro (rilievo stile Sailfish)
    sh = size * 0.022
    shadow = Image.new("RGBA", (size, size), (0, 0, 0, 0))
    ds = ImageDraw.Draw(shadow)
    lps, rps = pages()
    ds.polygon([(x, y + sh) for x, y in lps], fill=(0, 60, 100, 90))
    ds.polygon([(x, y + sh) for x, y in rps], fill=(0, 60, 100, 90))
    out.alpha_composite(shadow)

    d.polygon(lp, fill=PAGE)
    d.polygon(rp, fill=PAGE)
    d.rectangle([cx - size * 0.016, top, cx + size * 0.016, bot], fill=SPINE)

    # righe di testo sulle pagine
    lw = max(1, int(size * 0.012))
    for yf, dy in ((0.46, 0.022), (0.53, 0.026), (0.60, 0.030)):
        y = size * yf
        d.line([(cx - half + size * 0.045, y), (ol + size * 0.05, y + size * dy)],
               fill=TEXT, width=lw)
        d.line([(cx + half - size * 0.045, y), (orr - size * 0.05, y + size * dy)],
               fill=TEXT, width=lw)
    return out


def main():
    for s in (86, 108, 128, 172):
        os.makedirs(f"icons/{s}x{s}", exist_ok=True)
        draw_icon(s).save(f"icons/{s}x{s}/harbour-calibreweb.png")
    print("icone scritte: 86, 108, 128, 172")


if __name__ == "__main__":
    main()