/**
 * TICKETS
 *
 * a Linux cli for the mini ticket system written in C
 * features:
 * - create a ticket
 *   `tickets create <title> <description>`
 * - list all tickets (or filter by status)
 *   `tickets list --status=(open|in_progress|closed)`
 * - detail of one ticket
 *   `tickets detail <id>`
 */

fun showUsage() {
    println("usage:\n" +
          "  tickets create <title> <description>\n" +
          "  tickets list --status (open|in_progress|closed)\n" +
          "  tickets detail <id>\n")
}

fun parseCreate(title: String, description: String) {
    println("CREATE: creating a ticket with\n" +
            "title='$title'\n" +
            "description='$description'")
}

fun parseList(status: String) {
    println("LIST: listing items with status '$status'")
}

fun parseDetail(id: Int) {
    println("ID: the id i got is $id\ngoodbye!")
}

fun main(args: Array<String>) {
    // only program name
    if (args.isEmpty()) {
        showUsage()
        return
    } // args.size > 1

    // status filter or no filter
    if (args[0] == "list") {
        if (args.size >= 3 && args[1] == "--status") {
            parseList(args[2])
        } else {
            parseList("")
        }
        return
    }

    if (args.size >= 2 && args[0] == "detail") {
        val id = args[1].toIntOrNull()
        if (id == null) {
            showUsage()
            return
        } else {
            parseDetail(id)
        }
        return
    }

    if (args.size >= 3 && args[0] == "create") {
        parseCreate(args[1], args[2])
    } else {
        showUsage()
        return
    }
}