package com.bitcointxoko.gudariwallet.api

import com.google.gson.TypeAdapter
import com.google.gson.annotations.SerializedName
import com.google.gson.stream.JsonReader
import com.google.gson.stream.JsonToken
import com.google.gson.stream.JsonWriter

// ── Wallet ────────────────────────────────────────────────────────────────────
data class WalletResponse(
    val id: String,
    val name: String,
    val balance: Long       // millisatoshis
)

// ── Create invoice ────────────────────────────────────────────────────────────
data class CreateInvoiceRequest(
    val out: Boolean,
    val amount: Long,       // satoshis
    val memo: String
)

data class CreateInvoiceResponse(
    @SerializedName("payment_hash")    val paymentHash: String,
    @SerializedName("payment_request") val paymentRequest: String,
    @SerializedName("expiry")          val expiry        : String?
)

// ── Pay invoice ───────────────────────────────────────────────────────────────
data class PayInvoiceRequest(
    val out: Boolean,
    val bolt11: String
)

data class PayInvoiceResponse(
    @SerializedName("payment_hash") val paymentHash: String,
    @SerializedName("checking_id")  val checkingId: String
)

// ── Check payment ─────────────────────────────────────────────────────────────
data class PaymentStatusResponse(
    val paid: Boolean,
    val details: PaymentDetails? = null
)

data class PaymentDetails(
    val amount: Long?,
    val fee: Long?,
    val memo: String?
)

// ── Decode BOLT-11 ────────────────────────────────────────────────────────────
data class DecodeInvoiceRequest(
    val data: String
)

data class DecodeInvoiceResponse(
    @SerializedName("payment_hash") val paymentHash  : String? = null,
    @SerializedName("amount_msat")  val amountMsat   : Long?   = null,
    @SerializedName("description")  val description  : String? = null,
    @SerializedName("payee")        val payee        : String? = null,
    @SerializedName("route_hints")  val routeHints   : List<List<RouteHintHop>>? = null
)


data class RouteHintHop(
    @SerializedName("public_key")         val publicKey       : String,
    @SerializedName("short_channel_id")   val shortChannelId  : String? = null,
    @SerializedName("base_fee")           val baseFeeMsat     : Long    = 0,
    @SerializedName("ppm_fee")            val ppmFee          : Long    = 0,
    @SerializedName("cltv_expiry_delta")  val cltvExpiryDelta : Int     = 0
)

// ── LNURL scan ────────────────────────────────────────────────────────────────
data class LnurlScanResponse(
    val tag: String?,
    // ── payRequest fields ────────────────────────────────────────────────────
    val callback: String?                = null,
    @SerializedName("minSendable")    val minSendable: Long?    = null,
    @SerializedName("maxSendable")    val maxSendable: Long?    = null,
    val metadata: String?                = null,
    @SerializedName("commentAllowed") val commentAllowed: Int?  = null,
    @SerializedName("allowsNostr")    val allowsNostr: Boolean? = null,
    @SerializedName("nostrPubkey")    val nostrPubkey: String?  = null,
    val bolt11: String?                  = null,
    @SerializedName("amount_msat")    val amountMsat: Long?     = null,
    val disposable: Boolean?             = null,  // LUD-06: null means treat as true (do not cache)
    // ── withdrawRequest fields ───────────────────────────────────────────────
    val k1               : String?  = null,
    @SerializedName("defaultDescription")
    val defaultDescription: String? = null,
    @SerializedName("minWithdrawable")
    val minWithdrawable  : Long?    = null,
    @SerializedName("maxWithdrawable")
    val maxWithdrawable  : Long?    = null,
    @SerializedName("balanceCheck")
    val balanceCheck     : String?  = null,
    @SerializedName("currentBalance")
    val currentBalance   : Long?    = null,
    // ── Error fields ─────────────────────────────────────────────────────────
    val status         : String?  = null,   // "OK" or "ERROR"
    val reason         : String?  = null    // error message when status == "ERROR"
)

// ── LNURL-pay callback response (LUD-06) ─────────────────────────────────────
data class LnurlCallbackResponse(
    val pr            : String,           // BOLT-11 invoice to pay
    val routes        : List<Any>?  = null,
    @SerializedName("successAction")
    val successAction : SuccessAction? = null,
    // Error fields (server may return status=ERROR instead of pr)
    val status        : String?     = null,
    val reason        : String?     = null
)


// ── LNURL pay ─────────────────────────────────────────────────────────────────
data class LnurlPayRes(
    val tag: String?,
    val callback: String?,
    @SerializedName("minSendable")    val minSendable: Long?,
    @SerializedName("maxSendable")    val maxSendable: Long?,
    val metadata: String?,
    @SerializedName("commentAllowed") val commentAllowed: Int?,
    @SerializedName("allowsNostr")    val allowsNostr: Boolean? = null,
    @SerializedName("nostrPubkey")    val nostrPubkey: String?  = null
)

data class PayLnurlRequest(
    val res: LnurlPayRes,
    val lnurl: String,
    val amount: Long,
    val comment: String? = null
)

data class PayLnurlResponse(
    @SerializedName("payment_hash") val paymentHash: String,
    @SerializedName("checking_id")  val checkingId: String
)

data class WithdrawCallbackResponse(
    val status : String,
    val reason : String? = null
)

// ── LNURLp pay link (lightning address) ──────────────────────────────────────
data class LnurlpLink(
    val id          : String,
    val wallet      : String,
    val username    : String?,      // the part before the @ in the lightning address
    val description : String?,
    val min         : Long,
    val max         : Long
)


// ── Payment history ───────────────────────────────────────────────────────────
data class PaymentRecord(
    @SerializedName("payment_hash") val paymentHash: String,
    @SerializedName("checking_id")  val checkingId: String,
    @SerializedName("amount")       val amountMsat: Long,
    @SerializedName("fee")          val feeMsat: Long,
    @SerializedName("memo")         val memo: String?,
    @SerializedName("time")         val time: String,
    @SerializedName("status")       val status: String,
    @SerializedName("bolt11")       val bolt11: String?,
    @SerializedName("pending")      val pending: Boolean,
    @SerializedName("preimage")     val preimage: String?,
    @SerializedName("extra")        val extra: PaymentExtra?,
    // Not from the API — populated only when loaded from Room via toDomain()
    val createdAt: Long? = null,
    val pubkey: String? = null,
    val alias:  String? = null
) {
    val amountSat: Long     get() = kotlin.math.abs(amountMsat) / 1000L
    val feeSat: Long        get() = kotlin.math.abs(feeMsat)    / 1000L
    val isOutgoing: Boolean get() = amountMsat < 0
}

data class PaymentExtra(
    @SerializedName("tag")            val tag: String?,
    @SerializedName("comment")        val comment: String?,
    @SerializedName("success_action") val successAction: SuccessAction?,
    @SerializedName("wallet_id")      val walletId: String?,
    @SerializedName("destination")    val destination: String?,
    @SerializedName("expires_at")     val expiresAt: String?
)

data class SuccessAction(
    @SerializedName("tag")         val tag: String?,
    @SerializedName("message")     val message: String?,
    @SerializedName("url")         val url: String?,
    @SerializedName("description") val description: String?
)

/**
 * LNbits returns `success_action` as either:
 *   - a JSON object  {"tag":"message","message":"Thanks!"}
 *   - a plain string "Thanks!"
 *   - null
 *
 * Gson's default deserialiser throws IllegalStateException when it sees a
 * string where it expects {. This adapter handles all three cases.
 *
 * Registered centrally in [GsonProvider] — applies to all deserialization
 * paths automatically.
 */
class SuccessActionAdapter : TypeAdapter<SuccessAction?>() {

    override fun write(out: JsonWriter, value: SuccessAction?) {
        if (value == null) { out.nullValue(); return }
        out.beginObject()
        out.name("tag");         out.value(value.tag)
        out.name("message");     out.value(value.message)
        out.name("url");         out.value(value.url)
        out.name("description"); out.value(value.description)
        out.endObject()
    }

    override fun read(reader: JsonReader): SuccessAction? {
        return when (reader.peek()) {
            JsonToken.NULL -> { reader.nextNull(); null }

            // Plain string — treat as a message-type success action
            JsonToken.STRING -> {
                val text = reader.nextString()
                if (text.isBlank()) null
                else SuccessAction(tag = "message", message = text, url = null, description = null)
            }

            // Normal object
            JsonToken.BEGIN_OBJECT -> {
                reader.beginObject()
                var tag: String? = null
                var message: String? = null
                var url: String? = null
                var description: String? = null
                while (reader.hasNext()) {
                    when (reader.nextName()) {
                        "tag"         -> tag         = reader.nextString()
                        "message"     -> message     = reader.nextString()
                        "url"         -> url         = reader.nextString()
                        "description" -> description = reader.nextString()
                        else          -> reader.skipValue()
                    }
                }
                reader.endObject()
                SuccessAction(tag = tag, message = message, url = url, description = description)
            }

            else -> { reader.skipValue(); null }
        }
    }
}
data class PaymentDetailResponse(
    val paid: Boolean,
    val details: PaymentRecord?
)

// ── WebSocket payment message ─────────────────────────────────────────────────
data class WsPaymentMessage(
    val payment: WsPayment?
)

data class WsPayment(
    @SerializedName("payment_hash") val paymentHash: String,
    @SerializedName("checking_id")  val checkingId: String,
    @SerializedName("amount")       val amount: Long,
    @SerializedName("fee")          val fee: Long,
    @SerializedName("memo")         val memo: String?,
    @SerializedName("time")         val time: String,
    @SerializedName("status")       val status: String,
    @SerializedName("bolt11")       val bolt11: String?,
    @SerializedName("pending")      val pending: Boolean,
    @SerializedName("preimage")     val preimage: String?,
    @SerializedName("extra")        val extra: PaymentExtra?
)


// ── Fiat rate ────────────────────────────────────────────────────────────────
data class FiatRateResponse(
    val rate: Double,   // sat to fiat rate
    val price : Double  // BTC price in the requested fiat currency
)