#!/usr/bin/python3

import math
import subprocess

from lib import *


longest = 2 # ‘-1’

def parse() -> list[int]:
	xs = [None] * 0x110000
	p = subprocess.Popen(
		['./gen/prop/wdth.c'],
		stdout=subprocess.PIPE,
		shell=True,
	)
	for line in p.stdout:
		parts = line.decode().strip().split(' ')
		if len(parts[1]) == 1:
			parts[1] = ' ' + parts[1]
		xs[int(parts[0], 16)] = parts[1]
	return xs

def genfile(cs: list[tuple[int, ...]], blksize: int) -> None:
	Cs = cs
	cs = list(dict.fromkeys(Cs))

	print('''\
/* This file is autogenerated by gen/prop/wdth; DO NOT EDIT. */

#include <stdint.h>

#include "unicode/prop.h"
''')

	print(f'static constexpr {typename(len(cs) - 1)} stage1[] = {{')
	for i, c in enumerate(Cs):
		print(f'%c%{len(str(len(cs) - 1))}d,' % ('\t' if i % 16 == 0 else ' ', cs.index(c)), end='')
		if i % 16 == 15:
			print()
	print('};')

	print()

	ppc = columns(blksize, longest + 1)
	print(f'static constexpr int8_t stage2[][{blksize}] = {{')
	for c in cs:
		for i in range(blksize // ppc):
			print('\t{' if i == 0 else '\t ', end='')
			for j in range(ppc):
				print(c[i*ppc + j], end='')
				if i < blksize // ppc - 1 or j < ppc - 1:
					print(',', end='')
				if j < ppc - 1:
					print(' ' * (longest + 1 - len(c[i*ppc + j])), end='')
			if i < blksize // ppc - 1:
				print()
		print('},')
	print('};')

	print()

	print(f'''\
int
uprop_get_wdth(rune ch)
{{
	return stage2[stage1[ch / {blksize}]][ch % {blksize}];
}}''')

def main() -> None:
	cwd_init()
	xs = parse()

	blksize = -1
	smallest = math.inf

	for bs in powers_of_2():
		if bs > len(xs):
			break
		Cs = [tuple(x) for x in chunks(xs, bs)]
		cs = set(Cs)

		sz_s1 = len(Cs) * isize(len(cs) - 1)
		sz_s2 = len(cs) * bs
		sz = sz_s1 + sz_s2

		if sz < smallest:
			smallest = sz
			blksize = bs

	Cs = [tuple(x) for x in chunks(xs, blksize)]
	with open('lib/unicode/prop/uprop_get_wdth.c', 'w') as f:
		sys.stdout = f
		genfile(Cs, blksize)

	report_size(len(xs), smallest)

if __name__ == '__main__':
	main()