#!/usr/bin/env python3

import argparse
import sys
import rcc_format

def none(filelist, args):
    rcc_format.write_header(args.output, args.namespace)

    for f in filelist:
        with open(f.path, 'rb') as contents:
            rcc_format.write_item(args.output, f.variable, contents.read())
    
    rcc_format.write_entries(args.output, filelist)
    print("constexpr auto compression = embed::None;", file=args.output)
    
    rcc_format.write_footer(args.output, args.namespace)

if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description='Resource Compiler for C++',
        epilog='For a full list of compression options, check {mode} --help.',
    )
    mode = parser.add_subparsers(help='compression mode')

    none_mode = mode.add_parser('-')
    none_mode.set_defaults(func=none)
    
    zstd_mode = mode.add_parser('Zstd',
        description='use Zstd compression',
        epilog='A dictionary is recommended if compressing many small files. size(source)/size(dictionary) should be >= 10'
    )
    zstd_mode.add_argument('--binary', type=str, default='zstd', help='zstd binary name')
    zstd_mode.add_argument('--train', type=argparse.FileType('wb'), help='train dictionary and exit')
    zstd_mode.add_argument('-d', '--dict', type=argparse.FileType('rb'), help='use dictionary, recommended for many similar small files')
    zstd_mode.add_argument('--dsize', type=int, default=512, help='dictionary size, used for training')
    zstd_mode.add_argument('-l', '--level', type=int, default=19, help='compression level')
    zstd_mode.set_defaults(func=rcc_format.zstd)

    gen_mode = mode.add_parser('generate', description='Generate .xrc file from inputs')
    gen_mode.add_argument('-a', '--alias', type=str, help='set alias')
    gen_mode.set_defaults(func=rcc_format.generate)

    parser.add_argument('input', type=argparse.FileType('rt'), help='input file (.xrc)')
    parser.add_argument('-o', '--output', type=argparse.FileType('wt'), default=sys.stdout, help='output header file')
    parser.add_argument('-n', '--namespace', type=str, default='resources', help='namespace')

    args=parser.parse_args()

    args.func(rcc_format.filelist(args.input), args)