LernApp/src/main/kotlin/com/oliver/kidio/backend/plugins/Routing.kt

package com.oliver.kidio.backend.plugins

import com.oliver.kidio.backend.*
import com.oliver.kidio.backend.domain.repository.KidioRepository
import com.oliver.kidio.backend.security.JwtService
import io.ktor.http.HttpStatusCode
import io.ktor.server.application.*
import io.ktor.server.auth.authenticate
import io.ktor.server.auth.jwt.JWTPrincipal
import io.ktor.server.auth.principal
import io.ktor.server.request.*
import io.ktor.server.response.*
import io.ktor.server.routing.*
import org.mindrot.jbcrypt.BCrypt
import java.util.UUID

fun Application.configureRouting(repository: KidioRepository, jwtService : JwtService) {
    routing {
        post("/api/v1/auth/register") {
            val registerRequest = call.receive<RegisterRequest>()
            if (registerRequest.email.isBlank() || registerRequest.passwordPlain.isBlank()) {
                call.respond(HttpStatusCode.BadRequest, "Bitte füllen Sie alle Felder aus")
                return@post
            }
            if (registerRequest.parentPin.length != 4) {
                call.respond(HttpStatusCode.BadRequest, "Die Eltern-PIN muss genau 4 Ziffern lang sein")
                return@post
        }
            val existingUser = repository.findByEmail(registerRequest.email)
            if (existingUser != null) {
                call.respond(HttpStatusCode.Conflict, "Ein Benutzer mit dieser E-Mail-Adresse existiert bereits")
                return@post
            }

            // Backend generiert die eindeutige User-ID
            val userId = UUID.randomUUID().toString()
            val passwordHash = BCrypt.hashpw(registerRequest.passwordPlain, BCrypt.gensalt())

            //datenbank insert hinzufügen
            repository.registerUser(User(userId, registerRequest.email, passwordHash, registerRequest.familyName, registerRequest.childAge, registerRequest.parentPin))

            val token = jwtService.generateToken(userId)

            call.respond(
                HttpStatusCode.Created,
                mapOf(
                    "token" to token,
                    "userId" to userId,
                    "message" to "Registrierung erfolgreich"
                )
            )
        }
        // Health-Check
        get("/api/v1/health") {
            call.respond(mapOf("status" to "OK", "message" to "Kidio Backend läuft!"))
        }

        post ("/api/v1/auth/login" )   {
            val loginRequest = call.receive<LoginRequest>()

            val token = jwtService.generateToken(userId = loginRequest.userId)
            call.respond(mapOf("token" to token))
        }

        authenticate("auth-jwt") {

            // 1. Alle verfügbaren Aufgaben abrufen
            get("/api/v1/tasks") {
                val tasks = repository.getAllTasks()
                call.respond(tasks)
            }

            // 2. Antwort auf eine Aufgabe überprüfen
                post("/api/v1/tasks/verify") {
                    val request = call.receive<TaskVerifyRequest>()
                    val principal = call.principal<JWTPrincipal>()
                    val userId = principal?.payload?.getClaim("userId")?.asString()

                    if (userId == null){
                        call.respond(HttpStatusCode.Unauthorized, mapOf("error" to "Ungültiges oder abgelaufenes Token"))
                    return@post
                    }
                    val taskInfo = repository.getTaskAnswerAndReward(request.taskId)
                    if (taskInfo == null) {
                        call.respond(
                            TaskVerifyResponse(
                                isCorrect = false,
                                earnedMinutes = 0,
                                message = "Aufgabe nicht gefunden!"
                            )
                        )
                        return@post
                    }

                    val (correctAnswer, reward) = taskInfo
                    val isCorrect = request.selectedAnswer.trim() == correctAnswer.trim()

                    if (isCorrect) {
                        val currentScreentime = repository.getScreentime(userId)
                        val newSeconds = currentScreentime + (reward * 60)
                        repository.updateScreentime(userId, newSeconds)

                        call.respond(
                            TaskVerifyResponse(
                                isCorrect = true,
                                earnedMinutes = reward,
                                message = "Super gemacht! Du hast $reward Minuten gewonnen."
                            )
                        )
                    } else {
                        call.respond(
                            TaskVerifyResponse(
                                isCorrect = false,
                                earnedMinutes = 0,
                                message = "Schade, das war leider falsch. Versuche es nochmal!"
                            )
                        )
                    }
                }

            // 3. Bildschirmzeit synchronisieren
            post("/api/v1/screentime/sync") {
                val request = call.receive<SyncRequest>()

                val currentSeconds = repository.getScreentime(request.userId)
                var newSeconds = currentSeconds - request.usedSecondsSinceLastSync
                if (newSeconds < 0) newSeconds = 0

                repository.updateScreentime(request.userId, newSeconds)

                call.respond(
                    SyncResponse(
                        remainingSeconds = newSeconds,
                        isBlocked = newSeconds <= 0
                    )
                )
            }
        }
    }
}