#!/usr/bin/python2

import os
import subprocess
import sys

def run():
    mapping = {}

    for path, _, files in os.walk('src'):
        for f in files:
            if f.endswith('.rs') and f != 'colors.rs':
                for k, v in read_file(os.path.join(path, f)):
                    if k in mapping:
                        raise ValueError('Color {} defined twice'.format(k))
                    mapping[k] = v

    with open(sys.argv[1], 'w') as f:
        f.write('fn default_colors() -> HashMap<String, Color> {\n')
        f.write('    let mut m = HashMap::new();\n')
        for k in sorted(mapping.iterkeys()):
            f.write('    m.insert("{}".to_string(), {});\n'.format(k, mapping[k]))
        f.write('    m\n')
        f.write('}\n')


def read_file(filename):
    entries = []
    with open(filename, 'r') as f:
        src = ''.join(f.readlines())
        while src:
            if src.startswith('get_def('):
                src = src[len('get_def('):]

                # Look for the opening "
                while src[0] != '"':
                    src = src[1:]
                src = src[1:]

                # Read the key until the closing "
                key = ''
                while src[0] != '"':
                    key += src[0]
                    src = src[1:]
                src = src[1:]

                # Look for the ,
                while src[0] != ',':
                    src = src[1:]
                src = src[1:]

                # Look for the Color
                while not src.startswith('Color'):
                    src = src[1:]

                # Wait for the ()'s to be mismatched, meaning we found the ) of the get_def()
                counter = 0
                value = ''
                while True:
                    value += src[0]
                    if src[0] == '(':
                        counter += 1
                    elif src[0] == ')':
                        counter -= 1
                        if counter == -1:
                            value = value[:-1]
                            entries.append((key, value))
                            src = src[1:]
                            break
                    elif src[0] == ',' and counter == 0:
                        value = value[:-1]
                        entries.append((key, value))
                        src = src[1:]
                        break
                    src = src[1:]
            else:
                src = src[1:]
    return entries


if __name__ == '__main__':
    run()