package main

func isCommand(text string) (bool, string) {
	if text[0] == '/' {
		if len(text) > 1 && text[1] == '/' {
			text = text[1:]
			return false, text
		}
		return true, text
	}
	return false, text
}

func (a *application) processCommand(text string) {
	text = text[1:]
	args := []string {""}
	escaped := false
	quoted := false
	for _, c := range text {
		if escaped {
			args[len(args) - 1] += string(c)
			continue
		}
		switch c {
		case '\\':
			escaped = true
		case '"':
			quoted = !quoted
		case ' ':
			if !quoted {
				if args[len(args) - 1] != "" {
					args = append(args, "")
				}
				break
			}
			fallthrough
		default:
			args[len(args) - 1] += string(c)
		}
	}
	if len(text) > len(args[0]) {
		text = text[len(args[0]) + 1:]
	} else {
		text = ""
	}
	a.doCommand(args[0], args[1:], text)
}

func (a *application) doCommand(command string, args []string, text string) {
	if !a.connected {
		return
	}
	argN := func(n int) {
		if len(args) != n {
			a.cmdWindow.err(
				"%s: expected %d arguments, was %d", command, n, len(args),
			)
		}
	}
	switch command {
	case "nick":
		a.setNick(text)
	case "join":
		argN(1)
		if a.authenticated {
			a.join(args[0])
		}
	case "leave":
		argN(0)
		win := a.windowCache.Get(a.currentWindow)
		switch win.(type) {
		case *channelWindow:
			win.(*channelWindow).leaveChannel()
		}
		a.currentWindow = cmdWindowLocation {}
	case "create":
		argN(1)
		if a.authenticated {
			a.createChannel(args[0])
		}
	case "quit":
		a.quit = true
	default:
		a.cmdWindow.err("unknown command: /" + command)
	}
}