import io.javalin.Context
import io.javalin.Javalin
import org.slf4j.LoggerFactory

fun main() {
    val logger = LoggerFactory.getLogger("main")

    val app = Javalin.create().start(7000)
    app.get("/") { ctx -> ctx.result("Hello World") }

    app.post("/slack/receive") {
        ctx -> handleSlackEvent(ctx)
    }

    app.post("/api/v1/spongebob") {
        ctx -> ctx.json(TextResponse(200, ctx.body().toSpongemock()))
    }

    app.post("/api/v1/uppercase") {
        ctx -> ctx.json(TextResponse(200, ctx.body().toUpperCase()))
    }
}

fun handleSlackEvent(ctx: Context) {

    // Short circuit for ssl check
    if ((ctx.formParam("ssl_check") ?: 0) == "1") {
        ctx.status(200)
        return
    }

    val responseObj = RespObj(
        command = ctx.formParamMap().get("command")?.get(0).processtoCommand(),
        text = ctx.formParamMap().get("text")?.get(0) ?: "",
        response_url = ctx.formParamMap().get("response_url")?.get(0) ?: "",
        team_id = ctx.formParamMap().get("team_id")?.get(0) ?: "",
        channel_id = ctx.formParamMap().get("channel_id")?.get(0) ?: ""
    )

    sendResponse(ctx, responseObj)
}

private fun String?.processtoCommand(): Commands {
    return when (this) {
        "/spongemock2" -> Commands.Spongebob
        "/uppercase" -> Commands.Uppercase
        else -> Commands.Error
    }
}

fun sendResponse(ctx: Context, respObj: RespObj) {
    val returnMap = mutableMapOf<String, String>()
    with(returnMap) {
        when (respObj.command) {
            Commands.Spongebob -> {put("text", respObj.text.toSpongemock()); put("response_type", "in_channel")}
            Commands.Uppercase -> {put("text", respObj.text.toUpperCase()); put("response_type", "in_channel")}
            Commands.Error -> {put("text", respObj.text); put("response_type", "ephemeral")}
        }

    }
    ctx.json(returnMap)
}

data class TextResponse(val status: Int, val response: String)

private fun String.toSpongemock(): String {
    return this.mapIndexed { index, c -> if (!index.isOdd()) { c.toUpperCase() } else c }.joinToString(separator = "")
}

private fun Int.isOdd(): Boolean = this.rem(2) == 0