#!/usr/bin/python


import collections
import sys
import tempfile

CHAPTER_MARKER = '## '
STATUS_MARKER = '[status]: # '
ACT_MARKER = '[act]: # '
# Standard markdown comment marker, supported by Pandoc and Calibre's ebook-convert.
COMMENT_MARKER = '[//]: # '


def count_words(line):
    count = 0

    for word in line.strip().split(' '):
        if not word.strip() or word == '*' or word.startswith('#'):
            continue

        count += 1

    return count


def main():
    arguments = sys.argv[1:]
    filename = arguments[0]
    mdfile = None

    if '-pp' in arguments:
        # -pp flag to allow Markdown Preprocessing primarily to allow multi-file novel formatting
        # this is implemented using a temporary file created using python's buit-in tempfile library
        import MarkdownPP

        mdfile = tempfile.TemporaryFile(mode='w+')
        MarkdownPP.MarkdownPP(input=open(filename), output=mdfile, modules=list(MarkdownPP.modules))
        mdfile.seek(0)
    else:
        mdfile = open(filename)

    chapter_heading = None
    act_heading = None
    total_word_count = 0
    word_count_by_chapter = collections.defaultdict(int)
    word_count_by_status = collections.defaultdict(int)
    word_count_by_act = collections.defaultdict(int)
    status_by_chapter = {}
    current_status = None

    for line in mdfile.readlines():
        if line.startswith(CHAPTER_MARKER):
            word_count_by_act[act_heading] += word_count_by_chapter[chapter_heading]
            total_word_count += word_count_by_chapter[chapter_heading]

            chapter_heading = line[len(CHAPTER_MARKER) :].strip('()\n')

            # Count the words in chapter heading, because the chapter number and title count as words.
            word_count_by_chapter[chapter_heading] = count_words(chapter_heading)

            status_by_chapter[chapter_heading] = collections.defaultdict(int)
            current_status = None
        # Modified to allow multiple statuses in a single chapter, can swap back and forth.
        elif line.startswith(STATUS_MARKER):
            if current_status is None:
                current_status = line[len(STATUS_MARKER) :].strip('()\n')
                status_by_chapter[chapter_heading][current_status] = count_words(chapter_heading)
            else:
                current_status = line[len(STATUS_MARKER) :].strip('()\n')
        elif line.startswith(ACT_MARKER):
            act_heading = line[len(ACT_MARKER) :].strip('()\n')
            word_count_by_act[act_heading] = count_words(act_heading)
        elif line.startswith(COMMENT_MARKER):  # Don't count the words in a comment.
            pass
        else:
            line_word_count = count_words(line)
            word_count_by_chapter[chapter_heading] += line_word_count

            if current_status:
                word_count_by_status[current_status] += line_word_count
                status_by_chapter[chapter_heading][current_status] += line_word_count

    mdfile.close()

    # Do some final accounting after the last chapter.
    word_count_by_act[act_heading] += word_count_by_chapter[chapter_heading]
    total_word_count += word_count_by_chapter[chapter_heading]

    # -c or --chapter to give a chapter-by-chapter word count summary.
    if '-c' in arguments or '--chapter' in arguments:
        for chapter_heading, chapter_word_count in word_count_by_chapter.items():
            if chapter_heading is None:
                continue

            if len(status_by_chapter[chapter_heading]) > 1:
                print(f'chapter {chapter_heading}:')

                for chapter_status, status_count in status_by_chapter[chapter_heading].items():
                    print(f'\t {status_count:,} ({chapter_status})')
                print(f'\t {chapter_word_count:,} words (total)')
            elif len(status_by_chapter[chapter_heading]) == 1:
                chapter_status = list(status_by_chapter[chapter_heading].keys())[0]
                print(f'chapter {chapter_heading}: {chapter_word_count:,} ({chapter_status})')
            else:
                print(f'chapter {chapter_heading}: {chapter_word_count:,}')

        print()

    # -a or --act to give an act-by-act word count summary.
    if '-a' in arguments or '--act' in arguments:
        for act_heading, act_word_count in word_count_by_act.items():
            if act_heading is None:
                continue

            print(
                'act {}: {:,} words (~{}%)'.format(
                    act_heading, act_word_count, act_word_count * 100 // total_word_count
                )
            )

        print()

    for status, status_word_count in word_count_by_status.items():
        print(
            f'{status}: {status_word_count:,} words (~{status_word_count * 100 // total_word_count}%)'
        )

    print(f'total: {total_word_count:,} words')


if __name__ == '__main__':
    main()