import re

from .data import Message


def normalize_line(line: str) -> str:
    line = re.sub(r'(<[\w ]+>)', r'`\1`', line)
    line = re.sub(r'(\$\$\$)', r'`\1`', line)
    line = re.sub(r'\s\s', ' ', line)
    line = re.sub(r'\s+([.:;!?])', r'\1', line)
    return line.strip()


def format_message_as_citation(out: list[str], msg: Message) -> None:
    out.append(f'{msg.sent_at.date()} {msg.sent_at.time()} [[{msg.sender}]]:')
    out.append('\n')
    for line in msg.text.strip().split('\n'):
        normalized = normalize_line(line)
        out.append('>')
        if normalized:
            out.append(' ')
            out.append(normalized)
        out.append('\n')
        del line
    out.append('\n')


def format_message_as_table(out: list[str], msg: Message) -> None:
    out.append(f'| {msg.sent_at} | [[{msg.sender}]] | ')
    for line in msg.text.split('\n'):
        out.append(f'{line}')
        del line
    out.append('|\n')


def format_messages(messages: list[Message], title: str) -> str:
    out = ['# ', title, '\n\n']

    as_table = False

    for msg_idx, msg in enumerate(messages):
        if msg_idx == 0 or messages[msg_idx - 1].sent_at.date() != msg.sent_at.date():
            out.append('---\n')
            out.append(f'## [[{msg.sent_at.date()}]]\n\n')
            if as_table:
                out.append('| sent at | sender | text |\n')
                out.append('| ------- | ------ | ---- |\n')

        if as_table:
            format_message_as_table(out, msg)
        else:
            format_message_as_citation(out, msg)
        del msg

    return ''.join(out)