package eventDemo.configuration

import io.ktor.http.HttpHeaders
import io.ktor.http.HttpMethod
import io.ktor.http.HttpStatusCode
import io.ktor.server.application.Application
import io.ktor.server.application.install
import io.ktor.server.plugins.autohead.AutoHeadResponse
import io.ktor.server.plugins.cors.routing.CORS
import io.ktor.server.plugins.statuspages.StatusPages
import io.ktor.server.resources.Resources
import io.ktor.server.response.respondText

fun Application.configureHttpRouting() {
    install(CORS) {
        allowMethod(HttpMethod.Options)
        allowMethod(HttpMethod.Put)
        allowMethod(HttpMethod.Post)
        allowMethod(HttpMethod.Delete)
        allowMethod(HttpMethod.Patch)
        allowHeader(HttpHeaders.Authorization)
        allowHeader("MyCustomHeader")
        anyHost() // @TODO: Don't do this in production if possible. Try to limit it.
    }
    install(AutoHeadResponse)
    install(Resources)
    install(StatusPages) {
        exception<BadRequestException> { call, cause ->
            call.respondText(text = "400: $cause", status = HttpStatusCode.BadRequest)
        }
        exception<Throwable> { call, cause ->
            call.respondText(text = "500: $cause", status = HttpStatusCode.InternalServerError)
        }
    }
}

class BadRequestException(
    val httpError: HttpErrorBadRequest,
) : Exception()

class HttpErrorBadRequest(
    statusCode: HttpStatusCode,
    val title: String = statusCode.description,
    val invalidParams: List<InvalidParam>,
) {
    val statusCode: Int = statusCode.value

    data class InvalidParam(
        val name: String,
        val reason: String,
    )
}