import { Ionicons } from "@expo/vector-icons";
import * as Clipboard from "expo-clipboard";
import { router, useLocalSearchParams } from "expo-router";
import { useState } from "react";
import {
  Alert,
  Image,
  Linking,
  Pressable,
  ScrollView,
  Share,
  View,
} from "react-native";
import { Button } from "@/components/ui/Button";
import { AppHeader } from "@/components/ui/Header";
import { Screen } from "@/components/ui/Screen";
import { Text } from "@/components/ui/Text";
import { buildPharmacistOrderShareText } from "@/lib/commerce";
import { routes } from "@/lib/routes";
import { useOrdersStore } from "@/lib/stores/ordersStore";
import { colors, fonts, gutter, radii, shadows } from "@/lib/theme";
import { formatETB, WHATSAPP_NUMBER } from "@/lib/utils";

/**
 * Screenshot-friendly pharmacist order code card.
 * Guests copy / share / screenshot this so staff can create the order in admin.
 */
export default function PharmacistOrderCodeScreen() {
  const { id } = useLocalSearchParams<{ id: string }>();
  const order = useOrdersStore((s) => s.getById(id));
  const [copied, setCopied] = useState(false);

  if (!order?.pickupCode) {
    return (
      <Screen>
        <AppHeader title="Order code" />
        <View style={{ padding: gutter }}>
          <Text variant="body" color={colors.muted}>
            No pharmacist order code found for this order.
          </Text>
          <Button
            title="Back to orders"
            style={{ marginTop: 16 }}
            onPress={() => router.replace(routes.orders)}
          />
        </View>
      </Screen>
    );
  }

  const shareText = buildPharmacistOrderShareText(order);
  const due = order.selfPay ?? order.total;

  const copyCode = async () => {
    await Clipboard.setStringAsync(order.pickupCode!);
    setCopied(true);
    setTimeout(() => setCopied(false), 2000);
  };

  const copyFull = async () => {
    await Clipboard.setStringAsync(shareText);
    Alert.alert("Copied", "Order details copied — paste into chat or admin notes.");
  };

  const share = async () => {
    try {
      await Share.share({ message: shareText, title: `Gishen code ${order.pickupCode}` });
    } catch {
      // user dismissed
    }
  };

  const whatsapp = () => {
    Linking.openURL(
      `https://wa.me/${WHATSAPP_NUMBER}?text=${encodeURIComponent(shareText)}`
    );
  };

  return (
    <Screen>
      <AppHeader
        title="Pharmacist code"
        subtitle="Copy, share, or screenshot"
      />
      <ScrollView
        contentContainerStyle={{
          paddingHorizontal: gutter,
          paddingBottom: 48,
          gap: 16,
        }}
      >
        <Text variant="bodySm" color={colors.muted}>
          Share this code with a Gishen pharmacist. They enter it on the admin page
          to create your order. Pay when you collect.
        </Text>

        {/* Clean card — ideal for device screenshots */}
        <View
          style={{
            borderRadius: radii.lg,
            overflow: "hidden",
            backgroundColor: colors.surface,
            borderWidth: 1,
            borderColor: colors.brandBorder,
            ...shadows.md,
          }}
        >
          <View
            style={{
              backgroundColor: colors.brand,
              paddingVertical: 20,
              paddingHorizontal: 20,
              alignItems: "center",
              gap: 10,
            }}
          >
            <Image
              source={require("@/assets/logo/gishen-logo.png")}
              style={{ width: 48, height: 48, borderRadius: 12 }}
              resizeMode="contain"
            />
            <Text variant="h3" style={{ textAlign: "center" }}>
              Gishen Pharmacy
            </Text>
            <Text variant="caption" style={{ textAlign: "center", opacity: 0.85 }}>
              Pharmacist order code
            </Text>
          </View>

          <View style={{ padding: 22, alignItems: "center" }}>
            <Text variant="caption" color={colors.subtle} style={{ letterSpacing: 1 }}>
              SHOW OR SHARE THIS CODE
            </Text>
            <Text
              variant="display"
              style={{
                marginTop: 10,
                letterSpacing: 3,
                fontFamily: fonts.bold,
                fontSize: 36,
                lineHeight: 42,
              }}
            >
              {order.pickupCode}
            </Text>
            <Text
              variant="bodySm"
              color={colors.muted}
              style={{ marginTop: 12, textAlign: "center" }}
            >
              Enter on admin → create order
            </Text>
          </View>

          <View
            style={{
              borderTopWidth: 1,
              borderTopColor: colors.line,
              padding: 18,
              gap: 8,
            }}
          >
            <Row label="Customer" value={order.customerName ?? "—"} />
            <Row label="Phone" value={order.customerPhone ?? "—"} />
            <Row label="Items" value={`${order.items.length}`} />
            {order.items.slice(0, 6).map((item) => (
              <Text
                key={item.productId}
                variant="caption"
                color={colors.subtle}
                style={{ paddingLeft: 2 }}
              >
                · {item.name} ×{item.quantity}
              </Text>
            ))}
            {order.items.length > 6 ? (
              <Text variant="caption" color={colors.subtle}>
                · +{order.items.length - 6} more
              </Text>
            ) : null}
            <View
              style={{
                marginTop: 8,
                paddingTop: 12,
                borderTopWidth: 1,
                borderTopColor: colors.line,
                flexDirection: "row",
                justifyContent: "space-between",
                alignItems: "baseline",
              }}
            >
              <Text variant="label" color={colors.muted}>
                Total due
              </Text>
              <Text variant="priceLg">{formatETB(due)}</Text>
            </View>
            <Text variant="caption" color={colors.subtle} style={{ marginTop: 4 }}>
              Pay at branch when collecting
            </Text>
          </View>
        </View>

        <View
          style={{
            flexDirection: "row",
            alignItems: "center",
            gap: 8,
            paddingHorizontal: 4,
          }}
        >
          <Ionicons name="camera-outline" size={16} color={colors.subtle} />
          <Text variant="caption" color={colors.subtle} style={{ flex: 1 }}>
            Tip: screenshot the card above to show in person or send as an image.
          </Text>
        </View>

        <View style={{ gap: 10 }}>
          <Button
            title={copied ? "Code copied" : "Copy code"}
            icon={copied ? "checkmark-circle" : "copy-outline"}
            onPress={copyCode}
          />
          <View style={{ flexDirection: "row", gap: 10 }}>
            <View style={{ flex: 1 }}>
              <Button title="Share" icon="share-outline" variant="soft" onPress={share} />
            </View>
            <View style={{ flex: 1 }}>
              <Button
                title="WhatsApp"
                icon="logo-whatsapp"
                variant="outline"
                onPress={whatsapp}
              />
            </View>
          </View>
          <Pressable onPress={copyFull} hitSlop={8}>
            <Text
              variant="label"
              color={colors.brandText}
              style={{ textAlign: "center", marginTop: 4 }}
            >
              Copy full order details
            </Text>
          </Pressable>
        </View>

        <View style={{ gap: 10, marginTop: 4 }}>
          <Button
            title="View order"
            variant="ghost"
            onPress={() => router.replace(routes.orderDetail(order.id))}
          />
          <Button
            title="Done — back home"
            variant="dark"
            onPress={() => router.replace(routes.home)}
          />
        </View>
      </ScrollView>
    </Screen>
  );
}

function Row({ label, value }: { label: string; value: string }) {
  return (
    <View style={{ flexDirection: "row", justifyContent: "space-between", gap: 12 }}>
      <Text variant="caption" color={colors.subtle}>
        {label}
      </Text>
      <Text variant="label" style={{ flexShrink: 1, textAlign: "right" }}>
        {value}
      </Text>
    </View>
  );
}