#!/usr/bin/env python3
"""Repack VEXED's Micro Chat sheet into the game's CP437 atlas layout.

Source: assets/fonts/Micro-Chat-All/Micro-Chat.png — an 8-column grid with 1 px
gray grid lines, 8×10 cells, black glyphs on transparent; the glyph order comes
from the "Supported Glyphs (PNG Order)" block in Micro-Chat-Info.md.

Output: a 32×8-cell atlas (codepoint = index, like the CGA sheet) with white glyphs
on opaque black, so game/src/font.rs loads it unchanged. Cells are cropped to source
rows 1..9 (umlaut dots down to descenders): 8×9 px.

    python3 tools/mkfont.py
"""

from PIL import Image

SRC = "assets/fonts/Micro-Chat-All/Micro-Chat.png"
INFO = "assets/fonts/Micro-Chat-All/Micro-Chat-Info.md"
OUT = "assets/fonts/micro-chat-8x9.png"

CELL_W, CELL_H = 8, 10          # source cell
STRIDE_X, STRIDE_Y = 9, 11      # cell + grid line
CROP_TOP, OUT_H = 1, 9          # keep source rows 1..9

# Same table as font::cp437 — the accented slots the game may ask for.
CP437 = {
    'Ç': 128, 'ü': 129, 'é': 130, 'ä': 132, 'à': 133, 'å': 134, 'ç': 135,
    'ë': 137, 'è': 138, 'ï': 139, 'î': 140, 'ì': 141, 'Ä': 142, 'Å': 143,
    'É': 144, 'ö': 148, 'ò': 149, 'û': 150, 'ù': 151, 'Ö': 153, 'Ü': 154,
    'á': 160, 'í': 161, 'ó': 162, 'ú': 163, 'ñ': 164, 'Ñ': 165, 'ß': 225,
}
CP437.update({chr(c): c for c in range(32, 127)})


def source_cells():
    block = open(INFO, encoding="utf-8").read()
    block = block.split("## Supported Glyphs (PNG Order)")[1].split("``")[1]
    cells = {}
    for row, line in enumerate(block.strip("\n").split("\n")):
        for col, ch in enumerate(line):
            cells[ch] = (col, row)
    return cells


def main():
    src = Image.open(SRC).convert("RGBA")
    cells = source_cells()
    out = Image.new("RGB", (32 * CELL_W, 8 * OUT_H), (0, 0, 0))
    missing = []
    for ch, code in sorted(CP437.items(), key=lambda kv: kv[1]):
        if ch not in cells:
            missing.append(ch)
            continue
        if ch == " ":
            continue  # the sheet marks the space cell with a bar; ours must be blank
        col, row = cells[ch]
        x0, y0 = 1 + col * STRIDE_X, 1 + row * STRIDE_Y + CROP_TOP
        for y in range(OUT_H):
            for x in range(CELL_W):
                r, g, b, a = src.getpixel((x0 + x, y0 + y))
                if a > 0 and r < 100:
                    out.putpixel(((code % 32) * CELL_W + x, (code // 32) * OUT_H + y), (255, 255, 255))
    out.save(OUT)
    print(f"wrote {OUT}; missing: {''.join(missing) or '-'}")


if __name__ == "__main__":
    main()