#!/usr/bin/python3
import signal, sys

from lib.outputmanager import OutputManager
from lib.commandmanager import CommandManager
from lib.completionmanager import CompletionManager

from lib.exceptions import CmdNotFoundException, CommandException

class Manager:
    def __init__(self):
        self.loader = None
        self.completer = CompletionManager()

    def start(self):
        try:
            signal.signal(signal.SIGINT, signal.default_int_handler)
            while True:
                try:
                    try:
                        line = input('% ')
                    except KeyboardInterrupt:
                        output_manager.line_break()
                        continue

                    cmd_name = line.strip().split(' ')
                    if len(cmd_name) > 0 and len(cmd_name[0]) > 0:
                        cmd = cmd_manager.find(cmd_name[0])
                        cmd.execute(self.loader, line[1:] if len(line) > 1 else [])
                        
                except CommandException as err:
                    output_manager.error(str(err)).linebreak()
                    if err.print_usage:
                        output_manager.normal('Usage: {0}'.format(cmd.usage(line[0]))).line_break()

                except CmdNotFoundException as err:
                    output_manager.error('Error: {0}'.format(str(err))).linebreak()
                    
                except EOFError:
                    output_manager.line_break()
                    exit(0)
        except:
            raise

if __name__ == '__main__':
    try:
        manager = Manager()
        cmd_manager = CommandManager()
        output_manager = OutputManager()
        manager.start()

    except: # TODO: Improve exceptions handling
        print("Unexpected error:", sys.exc_info()[0])
        raise