#!/usr/bin/env python3
import os
import subprocess
import argparse
from shutil import unpack_archive
import yaml
import mergedeep
from lib import handlers
from appdirs import user_data_dir, user_config_dir

config = {
    'global': {
        'game_dir': os.path.join(user_data_dir(), 'minitch'),
        'os': 'linux'
    },
    'games': {}
}

def read_config():
    global config
    path = os.path.join(user_config_dir(), 'minitchrc')
    try:
        with open(path, 'r') as f:
            c = {**config, **yaml.safe_load(f)}
        mergedeep.merge(config, c)

    except FileNotFoundError:
        pass
    except yaml.YAMLError:
        raise SystemExit('Invalid config')

def write_config():
    global config
    path = os.path.join(user_config_dir(), 'minitchrc')
    with open(path, 'w') as f:
        yaml.dump(config, f, default_flow_style=False)

def parse_config(args):
    if args.api_key:
        config['global']['api_key'] = args.api_key

def parse_search(args):
    global config
    if not 'api_key' in config['global']:
        raise SystemExit('You have to set your api key first.')
    game_handler = handlers.GameHandler(config['global']['api_key'], output_format=args.output)
    game_handler.find(args.query)

def parse_uploads(args):
    global config
    if not 'api_key' in config['global']:
        raise SystemExit('You have to set your api key first.')
    game_handler = handlers.GameHandler(config['global']['api_key'], output_format=args.output)
    game_handler.uploads(args.game_id)

def install_game(game_id, dst_path, output_format):
    global config

    # Download game
    game_handler = handlers.GameHandler(config['global']['api_key'], output_format=output_format)
    dst, upload, meta = game_handler.download(game_id, dst_path, os_type=config['global']['os'])

    # Unpack game
    print('Extracting...')
    unpack_archive(dst, dst_path)

    return dst, upload, meta

def parse_install(args):
    global config

    # Create target directory
    game_path = os.path.join(config['global']['game_dir'], args.game_id)
    os.makedirs(game_path, exist_ok=True)

    try:
        dst, upload, meta = install_game(args.game_id, game_path, args.output)

        # Write game to config
        config['games'][args.game_id] = {
            'path': game_path,
            'last_update': upload['updated_at'],
            'url': meta['url'],
            'title': meta['title'],
            'description': meta['short_text']
        }

        print('FYI: As itch.io does not have any information on how to execute the game, you have to set the executable manually on first run with the --executable option')
    except handlers.HandlerException as err:
        raise SystemExit(str(err))

def parser_run(args):
    global config
    if not args.game_id in config['games']:
        raise SystemExit('Game is not installed.')
    if args.executable:
        config['games'][args.game_id]['executable'] = args.executable
    if not 'executable' in config['games'][args.game_id]:
        raise SystemExit('You have to define the executable before you can run the game.')
    
    if args.update:
        game_handler = handlers.GameHandler(config['global']['api_key'], output_format=args.output)
        print('Checking for updates...')
        if game_handler.check_update(args.game_id, config['games'][args.game_id]['last_update'], config['global']['os']):
            dst, upload, meta = install_game(args.game_id, config['games'][args.game_id]['path'], args.output)
            config['games'][args.game_id]['last_update'] = upload['updated_at']
            
    
    # Run executable
    os.chdir(config['games'][args.game_id]['path'])
    os.chmod(config['games'][args.game_id]['executable'], 755)
    subprocess.run(config['games'][args.game_id]['executable'])

def parser_list(args):
    global config
    game_handler = handlers.GameHandler(config['global']['api_key'], output_format=args.output)
    game_handler.list_local(config['games'])

def main():
    read_config()

    parser = argparse.ArgumentParser(description='Tiny little itch.io client')
    subparsers = parser.add_subparsers(title='subcommands', description='valid subcommands', help='additional help')

    # Global arguments
    parser.add_argument('--output', '-o', choices=('table', 'json'), default='table', help='set the output format')

    # Parser for "config" command
    parser_config = subparsers.add_parser('config', aliases=['c'], help='config help')
    parser_config.add_argument('--api_key', type=str, help='set api key')
    parser_config.set_defaults(func=parse_config)

    # Parser for "search" command
    parser_search = subparsers.add_parser('search', aliases=['s'], help='search help')
    parser_search.add_argument('query', type=str, help='the search query')
    parser_search.set_defaults(func=parse_search)

    # Parser for "uploads" command
    parser_search = subparsers.add_parser('uploads', help='uploads help')
    parser_search.add_argument('game_id', type=str, help='game_id to query')
    parser_search.set_defaults(func=parse_uploads)

    # Parser for "install" command
    parser_search = subparsers.add_parser('install', aliases=['i'], help='install help')
    parser_search.add_argument('game_id', type=str, help='game_id to query')
    parser_search.set_defaults(func=parse_install)

    # Parser for "run" command
    parser_search = subparsers.add_parser('run', aliases=['r'], help='run help')
    parser_search.add_argument('game_id', type=str, help='game_id to run')
    parser_search.add_argument('--executable', '-e', type=str, help='set executable relative to game path (e.g. -e "chess_2_linux_v2/chess 2.x86_64")')
    parser_search.add_argument('--update', '-u', help='check for update before running', action='store_true')
    parser_search.set_defaults(func=parser_run)

    # Parser for "list" command
    parser_search = subparsers.add_parser('list', aliases=['l'], help='list help')
    parser_search.set_defaults(func=parser_list)

    args = parser.parse_args()
    try:
        args.func(args)
    except AttributeError:
        parser.error('too few arguments')

    write_config()    

if __name__ == "__main__":
    main()