package com.android.trisolarisserver.controller

import com.android.trisolarisserver.db.repo.BookingRepo
import com.android.trisolarisserver.models.booking.Payment
import com.android.trisolarisserver.models.booking.PaymentMethod
import com.android.trisolarisserver.models.payment.RazorpayPaymentAttempt
import com.android.trisolarisserver.models.payment.RazorpayWebhookLog
import com.android.trisolarisserver.repo.PaymentRepo
import com.android.trisolarisserver.repo.PropertyRepo
import com.android.trisolarisserver.repo.RazorpayPaymentAttemptRepo
import com.android.trisolarisserver.repo.RazorpayQrRequestRepo
import com.android.trisolarisserver.repo.RazorpaySettingsRepo
import com.android.trisolarisserver.repo.RazorpayWebhookLogRepo
import com.fasterxml.jackson.databind.ObjectMapper
import jakarta.servlet.http.HttpServletRequest
import org.springframework.http.HttpStatus
import org.springframework.transaction.annotation.Transactional
import org.springframework.web.bind.annotation.PathVariable
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestBody
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.ResponseStatus
import org.springframework.web.bind.annotation.RestController
import org.springframework.web.server.ResponseStatusException
import java.time.OffsetDateTime
import java.util.UUID
import javax.crypto.Mac
import javax.crypto.spec.SecretKeySpec

@RestController
@RequestMapping("/properties/{propertyId}/razorpay/webhook")
class RazorpayWebhookCapture(
    private val propertyRepo: PropertyRepo,
    private val bookingRepo: BookingRepo,
    private val paymentRepo: PaymentRepo,
    private val settingsRepo: RazorpaySettingsRepo,
    private val razorpayPaymentAttemptRepo: RazorpayPaymentAttemptRepo,
    private val razorpayQrRequestRepo: RazorpayQrRequestRepo,
    private val razorpayWebhookLogRepo: RazorpayWebhookLogRepo,
    private val objectMapper: ObjectMapper
) {

    @PostMapping
    @ResponseStatus(HttpStatus.NO_CONTENT)
    @Transactional
    fun capture(
        @PathVariable propertyId: UUID,
        @RequestBody(required = false) body: String?,
        request: HttpServletRequest
    ) {
        val property = propertyRepo.findById(propertyId).orElseThrow {
            ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
        }
        val settings = settingsRepo.findByPropertyId(propertyId)
            ?: throw ResponseStatusException(HttpStatus.BAD_REQUEST, "Razorpay settings not configured")

        val headers = request.headerNames.toList().associateWith { request.getHeader(it) }
        val headersText = headers.entries.joinToString("\n") { (k, v) -> "$k: $v" }
        razorpayWebhookLogRepo.save(
            RazorpayWebhookLog(
                property = property,
                headers = headersText,
                payload = body,
                contentType = request.contentType,
                receivedAt = OffsetDateTime.now()
            )
        )

        if (body.isNullOrBlank()) return
        val signature = request.getHeader("X-Razorpay-Signature")
            ?: throw ResponseStatusException(HttpStatus.UNAUTHORIZED, "Missing signature")
        val secret = settings.webhookSecret
            ?: throw ResponseStatusException(HttpStatus.BAD_REQUEST, "Webhook secret not configured")
        if (!verifySignature(body, secret, signature)) {
            throw ResponseStatusException(HttpStatus.UNAUTHORIZED, "Invalid signature")
        }

        val root = objectMapper.readTree(body)
        val event = root.path("event").asText(null)
        val paymentEntity = root.path("payload").path("payment").path("entity")
        val orderEntity = root.path("payload").path("order").path("entity")
        val qrEntity = root.path("payload").path("qr_code").path("entity")
        val paymentId = paymentEntity.path("id").asText(null)
        val orderId = paymentEntity.path("order_id").asText(null)?.takeIf { it.isNotBlank() }
            ?: orderEntity.path("id").asText(null)?.takeIf { it.isNotBlank() }
        val status = paymentEntity.path("status").asText(null)
        val amountPaise = paymentEntity.path("amount").asLong(0)
        val currency = paymentEntity.path("currency").asText(property.currency)
        val notes = paymentEntity.path("notes")
        val bookingId = notes.path("bookingId").asText(null)?.let { runCatching { UUID.fromString(it) }.getOrNull() }
            ?: orderEntity.path("receipt").asText(null)?.let { runCatching { UUID.fromString(it) }.getOrNull() }
        val booking = bookingId?.let { bookingRepo.findById(it).orElse(null) }
        if (booking != null && booking.property.id != propertyId) return

        val qrId = qrEntity.path("id").asText(null)
        val qrStatus = qrEntity.path("status").asText(null)
        if (event != null && event.startsWith("qr_code.") && qrId != null) {
            val existingQr = razorpayQrRequestRepo.findTopByQrIdOrderByCreatedAtDesc(qrId)
            if (existingQr != null) {
                if (!qrStatus.isNullOrBlank()) {
                    existingQr.status = qrStatus
                    razorpayQrRequestRepo.save(existingQr)
                }
            }
        }

        razorpayPaymentAttemptRepo.save(
            RazorpayPaymentAttempt(
                property = property,
                booking = booking,
                event = event,
                status = status,
                amount = paiseToAmount(amountPaise),
                currency = currency,
                paymentId = paymentId,
                orderId = orderId,
                payload = body,
                receivedAt = OffsetDateTime.now()
            )
        )

        if (event == null || paymentId == null || booking == null) return
        if (event != "payment.captured" && event != "refund.processed") return

        if (paymentRepo.findByGatewayPaymentId(paymentId) != null) return

        val signedAmount = if (event == "refund.processed") -paiseToAmount(amountPaise) else paiseToAmount(amountPaise)
        val notesText = "razorpay event=$event status=$status order_id=$orderId"
        paymentRepo.save(
            Payment(
                property = booking.property,
                booking = booking,
                amount = signedAmount,
                currency = booking.property.currency,
                method = PaymentMethod.ONLINE,
                gatewayPaymentId = paymentId,
                gatewayTxnId = orderId,
                reference = "razorpay:$paymentId",
                notes = notesText,
                receivedAt = OffsetDateTime.now()
            )
        )
    }

    private fun verifySignature(payload: String, secret: String, signature: String): Boolean {
        return try {
            val mac = Mac.getInstance("HmacSHA256")
            mac.init(SecretKeySpec(secret.toByteArray(), "HmacSHA256"))
            val hash = mac.doFinal(payload.toByteArray()).joinToString("") { "%02x".format(it) }
            hash.equals(signature, ignoreCase = true)
        } catch (_: Exception) {
            false
        }
    }

    private fun paiseToAmount(paise: Long): Long {
        return paise / 100
    }
}