#!/usr/bin/env python3
"""Generate an 8x8 bitmap font for Agila from a system monospace font."""

from PIL import Image, ImageDraw, ImageFont

font_names = [
    "/System/Library/Fonts/Menlo.ttc",
    "/System/Library/Fonts/Monaco.dfont",
    "/Library/Fonts/Courier New.ttf",
    "/System/Library/Fonts/Courier.dfont",
]

font = None
for name in font_names:
    try:
        font = ImageFont.truetype(name, 8)
        print(f"Using font: {name}")
        break
    except Exception as e:
        print(f"Failed {name}: {e}")

if font is None:
    print("No suitable font found, using default")
    font = ImageFont.load_default()

w, h = 8, 8
values = []
for code in range(32, 127):
    ch = chr(code)
    img = Image.new("L", (w, h), 0)
    draw = ImageDraw.Draw(img)
    draw.text((0, 0), ch, font=font, fill=255)
    bytes_data = []
    for col in range(w):
        byte_val = 0
        for row in range(h):
            px = img.getpixel((col, row))
            if px > 127:
                byte_val |= 1 << row
        bytes_data.append(byte_val)
    values.extend(bytes_data)

with open("api/v/font5x7.fv", "w") as f:
    f.write("// font5x7.fv - 8x8 bitmap font (ASCII 32-126)\n")
    f.write("module agila\n\n")
    f.write("const font5x7 = [u8(0x{:02x}), ".format(values[0]))
    f.write(", ".join(f"0x{v:02x}" for v in values[1:]))
    f.write("]\n\n")
    f.write("pub fn glyph5x7(ch rune) []u8 {\n")
    f.write("\tcode := int(ch) - 32\n")
    f.write("\tif code < 0 || code > 94 {\n")
    f.write("\t\treturn font5x7[0..8] // space\n")
    f.write("\t}\n")
    f.write("\toff := code * 8\n")
    f.write("\treturn font5x7[off..off+8]\n")
    f.write("}\n")

print(f"Generated {len(values)} bytes for {len(values)//8} glyphs")