import React, { useState, useRef } from "react";
import { View, Text, TouchableOpacity, ScrollView } from "react-native";
import { SafeAreaView } from "react-native-safe-area-context";
import BackButton from "~/components/ui/backButton";
import { router, useLocalSearchParams } from "expo-router";
import { SMSIcon, WhatsappIcon } from "~/components/ui/icons";
import { RequestService } from "~/lib/services/requestService";
import { useAuthStore } from "~/lib/stores";
import { ROUTES } from "~/lib/routes";
import ModalToast from "~/components/ui/toast";
import { useTranslation } from "react-i18next";
import ScreenWrapper from "~/components/ui/ScreenWrapper";
import PermissionAlertModal from "~/components/ui/permissionAlertModal";

export default function NotificationOption() {
  const params = useLocalSearchParams<{
    amount: string;
    recipientName: string;
    recipientPhoneNumber: string;
    recipientType: string;
    recipientId: string;
    note: string;
    requestorName: string;
    requestorPhoneNumber: string;
    requestorType: string;
    type: string;
    provider?: string;
  }>();

  const [selectedMethod, setSelectedMethod] = useState<
    "SMS" | "WhatsApp" | null
  >(null);
  const { user } = useAuthStore();
  const isMoneyRequest = params.type === "request";
  const { t } = useTranslation();

  const [toastVisible, setToastVisible] = useState(false);
  const [toastTitle, setToastTitle] = useState("");
  const [toastDescription, setToastDescription] = useState<string | undefined>(
    undefined
  );
  const [toastVariant, setToastVariant] = useState<
    "success" | "error" | "warning" | "info"
  >("info");
  const toastTimeoutRef = React.useRef<ReturnType<typeof setTimeout> | null>(
    null
  );

  const [confirmVisible, setConfirmVisible] = useState(false);
  const [confirmTitle, setConfirmTitle] = useState("");
  const [confirmMessage, setConfirmMessage] = useState("");
  const confirmActionRef = useRef<() => void>(() => {});

  const showToast = (
    title: string,
    description?: string,
    variant: "success" | "error" | "warning" | "info" = "info"
  ) => {
    if (toastTimeoutRef.current) {
      clearTimeout(toastTimeoutRef.current);
    }

    setToastTitle(title);
    setToastDescription(description);
    setToastVariant(variant);
    setToastVisible(true);

    toastTimeoutRef.current = setTimeout(() => {
      setToastVisible(false);
      toastTimeoutRef.current = null;
    }, 2500);
  };

  const handleMoneyRequest = async (notificationMethod: "SMS" | "WhatsApp") => {
    if (!user?.uid) {
      showToast(
        t("notificationOption.toastErrorTitle"),
        t("notificationOption.toastAuthRequired"),
        "error"
      );
      return;
    }

    if (!params.amount || !params.recipientName || !params.requestorName) {
      showToast(
        t("notificationOption.toastErrorTitle"),
        t("notificationOption.toastMissingInfo"),
        "error"
      );
      return;
    }

    const amountInCents = parseInt(params.amount);
    if (isNaN(amountInCents) || amountInCents <= 0) {
      showToast(
        t("notificationOption.toastErrorTitle"),
        t("notificationOption.toastInvalidAmount"),
        "error"
      );
      return;
    }

    try {
      const result = await RequestService.createRequest(user.uid, {
        requestorName: params.requestorName,
        requesteeName: params.recipientName,
        requestorPhoneNumber: params.requestorPhoneNumber || "",
        requesteePhoneNumber: params.recipientPhoneNumber,
        requestorType: params.requestorType as "saved" | "contact",
        amount: amountInCents,
        note: params.note || "",
        status: "pending" as const,
        notificationMethod,
      });

      if (result.success) {
        // Navigate to success screen
        router.replace({
          pathname: ROUTES.MONEY_REQUESTED,
          params: {
            fullName: params.recipientName,
            requesteePhoneNumber: params.recipientPhoneNumber,
          },
        });
      } else {
        showToast(
          t("notificationOption.toastErrorTitle"),
          result.error || t("notificationOption.toastCreateFailed"),
          "error"
        );
      }
    } catch (error) {
      console.error("Error requesting money:", error);
      showToast(
        t("notificationOption.toastErrorTitle"),
        t("notificationOption.toastRequestFailed"),
        "error"
      );
    }
  };

  const handleMethodSelection = (method: "SMS" | "WhatsApp") => {
    setSelectedMethod(method);
  };

  const handleProceed = () => {
    if (!selectedMethod) {
      showToast(
        t("notificationOption.toastErrorTitle"),
        t("notificationOption.toastSelectMethod"),
        "error"
      );
      return;
    }

    const description = `Your money request will be sent to the selected donor and will be notified via ${selectedMethod}.`;
    const title = `${selectedMethod} Notification`;

    setConfirmTitle(title);
    setConfirmMessage(description);

    if (isMoneyRequest) {
      confirmActionRef.current = () => handleMoneyRequest(selectedMethod);
    } else {
      confirmActionRef.current = () => {
        console.log(`${selectedMethod} notification selected`);
        router.back();
      };
    }

    setConfirmVisible(true);
  };

  return (
    <ScreenWrapper edges={["top"]}>
      {/* Header with close button */}
      <View className="flex-row items-center justify-between">
        <BackButton />
      </View>

      {/* Main content */}
      <ScrollView className="flex-1 px-5 pt-10">
        {/* Title */}
        <View className="items-center mb-8">
          <Text className="text-3xl font-dmsans-bold text-black">
            {t("notificationOption.title")}
          </Text>
        </View>
        <View className="h-8" />

        {/* Notification Options Section */}
        <View className="mb-8">
          <Text className="text-lg font-dmsans-bold text-primary mb-2">
            {t("notificationOption.sectionTitle")}
          </Text>
          <Text className="text-gray-600 font-dmsans text-base">
            {t("notificationOption.sectionSubtitle")}
          </Text>
        </View>

        {/* SMS Notification Option */}
        <TouchableOpacity
          onPress={() => handleMethodSelection("SMS")}
          className={`rounded-lg p-4 mb-4 flex-row items-center ${
            selectedMethod === "SMS"
              ? "bg-green-50 border-2 border-primary"
              : "bg-green-50 border border-gray-200"
          }`}
        >
          <View className="p-3 mr-4">
            <SMSIcon />
          </View>
          <View className="flex-1">
            <Text className="font-dmsans-bold text-lg text-black">
              {t("notificationOption.smsLabel")}
            </Text>
          </View>
        </TouchableOpacity>

        {/* WhatsApp Notification Option */}
        <TouchableOpacity
          onPress={() => handleMethodSelection("WhatsApp")}
          className={`rounded-lg p-4 flex-row items-center ${
            selectedMethod === "WhatsApp"
              ? "bg-green-50 border-2 border-primary"
              : "bg-green-50 border border-gray-200"
          }`}
        >
          <View className="p-3 mr-4">
            <WhatsappIcon />
          </View>
          <View className="flex-1">
            <Text className="font-dmsans-bold text-lg text-black">
              {t("notificationOption.whatsappLabel")}
            </Text>
          </View>
        </TouchableOpacity>
      </ScrollView>

      {/* Proceed Button - Only visible when a method is selected */}
      {selectedMethod && (
        <View className="px-5">
          <TouchableOpacity
            onPress={handleProceed}
            className="bg-primary rounded-3xl items-center py-3"
          >
            <Text className="text-white font-dmsans-bold text-lg">
              {t("notificationOption.continueButton")}
            </Text>
          </TouchableOpacity>
        </View>
      )}
      <View className="h-4" />
      <ModalToast
        visible={toastVisible}
        title={toastTitle}
        description={toastDescription}
        variant={toastVariant}
      />

      <PermissionAlertModal
        visible={confirmVisible}
        title={confirmTitle}
        message={confirmMessage}
        primaryText="OK"
        secondaryText="Don't Allow"
        onPrimary={() => {
          setConfirmVisible(false);
          confirmActionRef.current && confirmActionRef.current();
        }}
        onSecondary={() => {
          setConfirmVisible(false);
        }}
      />
    </ScreenWrapper>
  );
}