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#!/usr/bin/env python3

import re
import os
import sys
import pwd
import subprocess
from subprocess import PIPE
from base64 import b64encode
import os.path as path

path_base = '/'

# ------------------------------------------------------------

def resolve_mail(addr, frag, comment):

    outstr = ''

    msg_id = addr
    mailfile = subprocess.run(f"mu find -u 'i:{msg_id}' --fields 'l'", shell=True, stdout=PIPE).stdout.decode('UTF-8').strip()
    mail = subprocess.run(f"mu view {mailfile}", shell=True, stdout=PIPE).stdout.decode('UTF-8')
    outstr += '\\begin{verbatim}\n'
    if frag == 'short':
        last_arrow = False
        out = []
        for line in mail.split('\n'):
            if not line:
                out += ['']
                continue
            if line[0] == '>':
                arrow = True
                if arrow and not last_arrow:
                    out += ['> [...]']
                last_arrow = True
                continue
            out += [line]
        outstr += '\n'.join(out)
    else:
        outstr += mail + '\n'
    outstr += '\\end{verbatim}\n'
    return outstr


def resolve_help(addr, frag, comment):
    pass
    return ''


def resolve_file(addr, frag, comment):
    extension = addr.split('.')[-1]

    full_file = path.join(path_base, addr)

    if extension == 'pdf':
        return f'\\includepdf[pages=-,pagecommand={{}},width=\\textwidth]{{{full_file}}}\n'
    # TODO
    # elif extension == 'tex':
    #     return f'\\subfile{{{full_file}}}\n'
    else:
        with open(full_file, 'r') as f:
            return f.read() + '\n'


def resolve_default(addr, frag, comment):
    outstr = ''
    if addr == '':
        page = get_heading(frag, data)
        outstr += '\\begin{verbatim}\n'
        outstr += page + '\n'
        outstr += '\\end{verbatim}\n'
    else:
        print(addr)
        print("Vimwiki intra-page links not yet supported")
        outstr = ''
    return outstr

# Should all take (url without protocol, fragment, comment)
resolvers = {
        'mail': resolve_mail,
        'file': resolve_file,
        'help': resolve_help,
}

# ------------------------------------------------------------

def get_heading(name, data):
    start_match = re.search(f'(?m)^(=+) {name} =+$', data)
    print(start_match)
    heading_level = len(start_match.group(1))
    print(start_match.end())
    tail = data[start_match.end():]
    pat = f'(?m)^(={{1,{heading_level}}} .*|---*)$'
    print(pat)
    end_match = re.search(pat, tail)
    print(end_match)
    if end_match:
        return tail[:end_match.start() - 1]
    else:
        return tail

# ------------------------------------------------------------

[_, infile, heading, *rest] = sys.argv

file = open(infile, 'r')
data = file.read()

path_base = path.dirname(infile)


output = open('doc.tex', 'w')

name = pwd.getpwuid(os.getuid()).pw_gecos

output.write(f'''
\\documentclass[a4paper]{{article}}

\\usepackage[T1]{{fontenc}}
\\usepackage[utf8]{{inputenc}}
\\usepackage[swedish]{{babel}}
\\usepackage{{verbatim}}
\\usepackage{{fullpage}}
\\usepackage{{pdfpages}}
\\usepackage{{subfiles}}

\\title{{{heading}}}
\\date\\today
\\author{{{name}}}
\\begin{{document}}
\\maketitle
''')

# '\\verbatiminput

page1 = get_heading(heading, data)
# bilagor = get_heading('Bilagor', page1).strip().split('\n')
r = "\\[\\[([^|#\\]]*)(?:#([^|\\]]*))?(?:[|]([^\\]]*))?\\]\\]"
# bilagor = re.findall(r, page1)
tag_iter = re.finditer(r, page1)

# bilagor = [m[0] for m in re.findall(r, data)]

bilagor = []

outstr = ""
pos = 0

bilaga_nr = 1
for match in tag_iter:
    url = match.group(1) or ''
    frag = match.group(2) or ''
    comment = match.group(3) or ''

    outstr += page1[pos:match.start()]
    pos = match.end()

    uid = b64encode((url + frag).encode('UTF-8'))

    title = comment or url or fragment

    # outstr += title + f"(bilaga~\\ref{{{uid}}})"
    # TODO
    # outstr += title + f' (bilaga {chr(bilaga_nr + 64)})'
    outstr += title + " (se bilaga)"
    bilaga_nr += 1

    try:
        proto, addr = url.split(":", 1)
    except ValueError:
        proto = ''
        addr = url
    print(proto, addr)

    # disabled for full PDF:s
    attach_str = ''
    attach_str += f"\\section{{{title}}}\n\\label{{{uid}}}\n"

    resolver = resolvers.get(proto, resolve_default)
    attach_str += resolver(addr, frag, comment)
    bilagor += [attach_str]


output.write('\\begin{verbatim}\n')
output.write(outstr + '\n')
output.write('\\end{verbatim}\n\\appendix\n')

output.write('\n'.join(bilagor))

output.write('\\end{document}')