from __future__ import annotations

import array
import unicodedata
import requests


MAX_CODEPOINTS = 0x110000

UNICODE_DATA_URL = "https://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt"


# see https://www.unicode.org/L2/L1999/UnicodeData.html
def unicode_data_iter():
 res = requests.get(UNICODE_DATA_URL)
 res.raise_for_status()
 data = res.content.decode()

 prev = []

 for line in data.splitlines():
 # ej: 0000;<control>;Cc;0;BN;;;;;N;NULL;;;;
 line = line.split(";")

 cpt = int(line[0], base=16)
 assert cpt < MAX_CODEPOINTS

 cpt_lower = int(line[-2] or "0", base=16)
 assert cpt_lower < MAX_CODEPOINTS

 cpt_upper = int(line[-3] or "0", base=16)
 assert cpt_upper < MAX_CODEPOINTS

 categ = line[2].strip()
 assert len(categ) == 2

 bidir = line[4].strip()
 assert len(categ) == 2

 name = line[1]
 if name.endswith(", First>"):
 prev = (cpt, cpt_lower, cpt_upper, categ, bidir)
 continue
 if name.endswith(", Last>"):
 assert prev[1:] == (0, 0, categ, bidir)
 for c in range(prev[0], cpt):
 yield (c, cpt_lower, cpt_upper, categ, bidir)

 yield (cpt, cpt_lower, cpt_upper, categ, bidir)


# see definition in unicode.h
CODEPOINT_FLAG_UNDEFINED = 0x0001 #
CODEPOINT_FLAG_NUMBER = 0x0002 # \p{N}
CODEPOINT_FLAG_LETTER = 0x0004 # \p{L}
CODEPOINT_FLAG_SEPARATOR = 0x0008 # \p{Z}
CODEPOINT_FLAG_MARK = 0x0010 # \p{M}
CODEPOINT_FLAG_PUNCTUATION = 0x0020 # \p{P}
CODEPOINT_FLAG_SYMBOL = 0x0040 # \p{S}
CODEPOINT_FLAG_CONTROL = 0x0080 # \p{C}

UNICODE_CATEGORY_TO_FLAG = {
 "Cn": CODEPOINT_FLAG_UNDEFINED, # Undefined
 "Cc": CODEPOINT_FLAG_CONTROL, # Control
 "Cf": CODEPOINT_FLAG_CONTROL, # Format
 "Co": CODEPOINT_FLAG_CONTROL, # Private Use
 "Cs": CODEPOINT_FLAG_CONTROL, # Surrrogate
 "Ll": CODEPOINT_FLAG_LETTER, # Lowercase Letter
 "Lm": CODEPOINT_FLAG_LETTER, # Modifier Letter
 "Lo": CODEPOINT_FLAG_LETTER, # Other Letter
 "Lt": CODEPOINT_FLAG_LETTER, # Titlecase Letter
 "Lu": CODEPOINT_FLAG_LETTER, # Uppercase Letter
 "L&": CODEPOINT_FLAG_LETTER, # Cased Letter
 "Mc": CODEPOINT_FLAG_MARK, # Spacing Mark
 "Me": CODEPOINT_FLAG_MARK, # Enclosing Mark
 "Mn": CODEPOINT_FLAG_MARK, # Nonspacing Mark
 "Nd": CODEPOINT_FLAG_NUMBER, # Decimal Number
 "Nl": CODEPOINT_FLAG_NUMBER, # Letter Number
 "No": CODEPOINT_FLAG_NUMBER, # Other Number
 "Pc": CODEPOINT_FLAG_PUNCTUATION, # Connector Punctuation
 "Pd": CODEPOINT_FLAG_PUNCTUATION, # Dash Punctuation
 "Pe": CODEPOINT_FLAG_PUNCTUATION, # Close Punctuation
 "Pf": CODEPOINT_FLAG_PUNCTUATION, # Final Punctuation
 "Pi": CODEPOINT_FLAG_PUNCTUATION, # Initial Punctuation
 "Po": CODEPOINT_FLAG_PUNCTUATION, # Other Punctuation
 "Ps": CODEPOINT_FLAG_PUNCTUATION, # Open Punctuation
 "Sc": CODEPOINT_FLAG_SYMBOL, # Currency Symbol
 "Sk": CODEPOINT_FLAG_SYMBOL, # Modifier Symbol
 "Sm": CODEPOINT_FLAG_SYMBOL, # Math Symbol
 "So": CODEPOINT_FLAG_SYMBOL, # Other Symbol
 "Zl": CODEPOINT_FLAG_SEPARATOR, # Line Separator
 "Zp": CODEPOINT_FLAG_SEPARATOR, # Paragraph Separator
 "Zs": CODEPOINT_FLAG_SEPARATOR, # Space Separator
}


codepoint_flags = array.array('H', [CODEPOINT_FLAG_UNDEFINED]) * MAX_CODEPOINTS
table_whitespace = []
table_lowercase = []
table_uppercase = []
table_nfd = []

for (cpt, cpt_lower, cpt_upper, categ, bidir) in unicode_data_iter():
 # convert codepoint to unicode character
 char = chr(cpt)

 # codepoint category flags
 codepoint_flags[cpt] = UNICODE_CATEGORY_TO_FLAG[categ]

 # lowercase conversion
 if cpt_lower:
 table_lowercase.append((cpt, cpt_lower))

 # uppercase conversion
 if cpt_upper:
 table_uppercase.append((cpt, cpt_upper))

 # NFD normalization
 norm = ord(unicodedata.normalize('NFD', char)[0])
 if cpt != norm:
 table_nfd.append((cpt, norm))


# whitespaces, see "<White_Space>" https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt
table_whitespace.extend(range(0x0009, 0x000D + 1))
table_whitespace.extend(range(0x2000, 0x200A + 1))
table_whitespace.extend([0x0020, 0x0085, 0x00A0, 0x1680, 0x2028, 0x2029, 0x202F, 0x205F, 0x3000])


# sort by codepoint
table_whitespace.sort()
table_lowercase.sort()
table_uppercase.sort()
table_nfd.sort()


# group ranges with same flags
ranges_flags: list[tuple[int, int]] = [(0, codepoint_flags[0])] # start, flags
for codepoint, flags in enumerate(codepoint_flags):
 if flags != ranges_flags[-1][1]:
 ranges_flags.append((codepoint, flags))
ranges_flags.append((MAX_CODEPOINTS, 0x0000))


# group ranges with same nfd
ranges_nfd: list[tuple[int, int, int]] = [(0, 0, 0)] # start, last, nfd
for codepoint, norm in table_nfd:
 start = ranges_nfd[-1][0]
 if ranges_nfd[-1] != (start, codepoint - 1, norm):
 ranges_nfd.append(None) # type: ignore[arg-type] # dummy, will be replaced below
 start = codepoint
 ranges_nfd[-1] = (start, codepoint, norm)


# Generate 'unicode-data.cpp':
# python ./scripts//gen-unicode-data.py > unicode-data.cpp

def out(line=""):
 print(line, end='\n') # noqa


out("""\
// generated with scripts/gen-unicode-data.py

#include "unicode-data.h"

#include <cstdint>
#include <vector>
#include <unordered_map>
#include <unordered_set>
""")

out("const std::vector<std::pair<uint32_t, uint16_t>> unicode_ranges_flags = { // start, flags // last=next_start-1")
for codepoint, flags in ranges_flags:
 out("{0x%06X, 0x%04X}," % (codepoint, flags))
out("};\n")

out("const std::unordered_set<uint32_t> unicode_set_whitespace = {")
for codepoint in table_whitespace:
 out("0x%06X," % codepoint)
out("};\n")

out("const std::unordered_map<uint32_t, uint32_t> unicode_map_lowercase = {")
for tuple_lw in table_lowercase:
 out("{0x%06X, 0x%06X}," % tuple_lw)
out("};\n")

out("const std::unordered_map<uint32_t, uint32_t> unicode_map_uppercase = {")
for tuple_up in table_uppercase:
 out("{0x%06X, 0x%06X}," % tuple_up)
out("};\n")

out("const std::vector<range_nfd> unicode_ranges_nfd = { // start, last, nfd")
for triple in ranges_nfd:
 out("{0x%06X, 0x%06X, 0x%06X}," % triple)
out("};\n")