"""Build a static store map (no third-party iframe, no cookie) from OpenStreetMap tiles.

Usage: python make_map.py LAT LON OUT.jpg [ZOOM]
"""
import io
import math
import sys
import time
import urllib.request

from PIL import Image, ImageDraw, ImageFont

lat, lon, out = float(sys.argv[1]), float(sys.argv[2]), sys.argv[3]
zoom = int(sys.argv[4]) if len(sys.argv) > 4 else 16
W, H = 1200, 700  # output size, 2x for retina
UA = 'footfr-store-page-test/1.0 (one-off static map, contact shop@foot.fr)'


def to_px(lat, lon, z):
    n = 2 ** z
    x = (lon + 180.0) / 360.0 * n * 256
    y = (1.0 - math.asinh(math.tan(math.radians(lat))) / math.pi) / 2.0 * n * 256
    return x, y


cx, cy = to_px(lat, lon, zoom)
x0, y0 = int(cx - W / 2), int(cy - H / 2)
canvas = Image.new('RGB', (W, H), 'white')
for tx in range(x0 // 256, (x0 + W) // 256 + 1):
    for ty in range(y0 // 256, (y0 + H) // 256 + 1):
        url = f'https://tile.openstreetmap.org/{zoom}/{tx}/{ty}.png'
        req = urllib.request.Request(url, headers={'User-Agent': UA})
        with urllib.request.urlopen(req) as r:
            tile = Image.open(io.BytesIO(r.read())).convert('RGB')
        canvas.paste(tile, (tx * 256 - x0, ty * 256 - y0))
        time.sleep(0.2)

# Soften the base map so the marker stands out, like a muted brand map.
canvas = Image.blend(canvas, Image.new('RGB', (W, H), (245, 245, 245)), 0.25)
d = ImageDraw.Draw(canvas)
mx, my = W // 2, H // 2
# Pin: black circle with white ring, brand blue dot.
d.ellipse([mx - 26, my - 26, mx + 26, my + 26], fill=(29, 29, 29), outline='white', width=6)
d.ellipse([mx - 9, my - 9, mx + 9, my + 9], fill=(29, 187, 255))
try:
    font = ImageFont.truetype('arial.ttf', 22)
except OSError:
    font = ImageFont.load_default()
label = '© les contributeurs OpenStreetMap'
tw = d.textlength(label, font=font)
d.rectangle([W - tw - 20, H - 36, W, H], fill=(255, 255, 255))
d.text((W - tw - 10, H - 32), label, fill=(60, 60, 60), font=font)
canvas.save(out, 'JPEG', quality=82, optimize=True, progressive=True)
print('saved', out, canvas.size)