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#!/usr/bin/python3

import math

from lib import *


MAP = {
	'ATerm':     'AT',
	'Close':     'CL',
	'CR':        'CR',
	'Extend':    'EX',
	'Format':    'FO',
	'LF':        'LF',
	'Lower':     'LO',
	'Numeric':   'NU',
	'OLetter':   'LE',
	'Other':     'XX',
	'SContinue': 'SC',
	'Sep':       'SE',
	'Sp':        'SP',
	'STerm':     'ST',
	'Upper':     'UP',
}

longest = 0

def parse(file: str) -> list[bool]:
	global longest

	xs = ['SB_XX'] * 0x110000
	with open(file, 'r') as f:
		for line in f.readlines():
			if len(line.strip()) == 0 or line[0] == '#':
				continue

			parts = line.split(';')
			ranges = [int(x, 16) for x in parts[0].strip().split('..')]
			prop = 'SB_' + MAP[parts[1].split('#')[0].strip()]
			longest = max(longest, len(prop))

			for i in range(ranges[0], ranges[len(ranges) - 1] + 1):
				xs[i] = prop
	return xs

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

	print('''\
/* This file is autogenerated by gen/prop/sb; 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 enum uprop_sb 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'''\
enum uprop_sb
uprop_get_sb(rune ch)
{{
	return stage2[stage1[ch / {blksize}]][ch % {blksize}];
}}''')

def main() -> None:
	cwd_init()
	xs = parse('data/SentenceBreakProperty')

	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_sb.c', 'w') as f:
		sys.stdout = f
		genfile(Cs, blksize)

	report_size(len(xs), smallest)

if __name__ == '__main__':
	main()