#!/usr/bin/env python3
import os

COMMENT_PREFIX = '/// '

current_indent = 0
current_class = None
current_method = None
current_package = None


def split_to_parts(line, mod_desc=None):
    global current_indent
    global current_class
    global current_method

    if line.startswith('class '):
        current_class = line[6:].split('(')[0].strip(':')
        current_indent = 0

        yield (current_package, "\n")
        yield (current_package, '# ' + mod_desc + "\n")

    elif line.startswith('def '):
        current_method = line[4:].split('(')[0]

        yield (current_package, "\n")

        if current_class is None:
            yield (current_package, '# ' + mod_desc + "\n")
        else:
            current_indent = 4

    line = current_indent * ' ' + line

    yield (current_package, line)


def store_to_file(dest, parts):
    for package, line in parts:
        dirpath = os.path.abspath(dest)
        filename = package

        if not os.path.exists(dirpath):
            os.makedirs(dirpath)
            open(os.path.join(dirpath, '__init__.py'), 'w').close()
            open(os.path.join(dirpath, '.mock-generated'), 'w').close()

        filepath = os.path.join(dirpath, filename + '.py')

        if not os.path.exists(filepath):
            with open(filepath, 'a') as f:
                f.write('from typing import *\n')

        with open(filepath, 'a') as f:
            f.write(line)


def build_module(mod_file, dest):
    global current_indent
    global current_class
    global current_package

    if not (mod_file.endswith('.h') or mod_file.endswith('.c')):
        return
    if not os.path.basename(mod_file).startswith('mod'):
        return

    current_indent = 0
    current_class = None
    current_package = os.path.basename(mod_file) \
        .split('.')[0] \
        .split('-')[0] \
        .replace('mod', '')
    mod_desc = mod_file.replace('../embed/extmod', 'extmod')

    for l in open(mod_file):
        if not l.startswith(COMMENT_PREFIX):
            continue

        l = l[len(COMMENT_PREFIX):]  # .strip()
        store_to_file(dest, split_to_parts(l, mod_desc))


def build_directory(dir, dest):
    print("Building mocks for", dir, "to", dest)
    for pkg in sorted(os.listdir(dir)):
        for mod in sorted(os.listdir(os.path.join(dir, pkg))):
            build_module(os.path.join(dir, pkg, mod), dest)


def clear_directory(top_dir):
    print("Clearing up directory", top_dir)
    for root, dirs, files in os.walk(top_dir, topdown=False):
        if '.mock-generated' not in files:
            # print("Not a mock directory", root)
            continue
        for name in files:
            # print('Deleting file', os.path.join(root, name))
            os.remove(os.path.join(root, name))
        for name in dirs:
            # print('Deleting directory', os.path.join(root, name))
            try:
                os.rmdir(os.path.join(root, name))
            except FileNotFoundError:
                pass

        os.rmdir(root)


if __name__ == '__main__':
    clear_directory('../mocks/generated')
    build_directory('../embed/extmod', '../mocks/generated')
