import { Ionicons } from "@expo/vector-icons";
import { router, useLocalSearchParams } from "expo-router";
import { Alert, Image, ScrollView, View } from "react-native";
import { Badge } from "@/components/ui/Badge";
import { Button } from "@/components/ui/Button";
import { Card, InfoRow, Section } from "@/components/ui/Card";
import { AppHeader } from "@/components/ui/Header";
import { Screen } from "@/components/ui/Screen";
import { Text } from "@/components/ui/Text";
import { getBranchById } from "@/lib/data/branches";
import { routes } from "@/lib/routes";
import { useOrdersStore } from "@/lib/stores/ordersStore";
import { colors, gutter, radii } from "@/lib/theme";
import { formatETB } from "@/lib/utils";

const toneFor = {
  requested: "neutral",
  confirmed: "info",
  paid: "brand",
  dispatched: "warn",
  delivered: "brand",
  completed: "brand",
  cancelled: "danger",
} as const;

export default function OrderDetailScreen() {
  const { id } = useLocalSearchParams<{ id: string }>();
  const order = useOrdersStore((s) => s.getById(id));
  const cancelOrder = useOrdersStore((s) => s.cancelOrder);
  const updateStatus = useOrdersStore((s) => s.updateStatus);

  if (!order) {
    return (
      <Screen>
        <AppHeader title="Order" />
        <View style={{ padding: gutter }}>
          <Text variant="body" color={colors.muted}>
            Order not found.
          </Text>
        </View>
      </Screen>
    );
  }

  const branch = order.branchId ? getBranchById(order.branchId) : undefined;
  const canCancel = !["delivered", "completed", "cancelled"].includes(order.status);

  return (
    <Screen>
      <AppHeader
        title="Order details"
        subtitle={new Date(order.createdAt).toLocaleString()}
        right={
          <Badge label={order.status} tone={toneFor[order.status]} />
        }
      />
      <ScrollView
        contentContainerStyle={{
          paddingHorizontal: gutter,
          paddingBottom: 40,
          gap: 14,
        }}
      >
        <Card>
          <Text variant="caption" color={colors.subtle}>
            {order.id}
            {order.isGuestOrder ? " · Guest" : ""}
          </Text>
          <Text variant="h2" style={{ marginTop: 4 }}>
            {order.anyBranch
              ? "Any-branch pickup"
              : order.fulfillment === "pickup"
                ? "Pickup order"
                : "Delivery order"}
          </Text>
          <Text variant="bodySm" color={colors.muted} style={{ marginTop: 6 }}>
            {order.customerName} · {order.customerPhone}
          </Text>
          {order.notes ? (
            <Text variant="bodySm" color={colors.muted} style={{ marginTop: 6 }}>
              Notes: {order.notes}
            </Text>
          ) : null}
        </Card>

        {order.pickupCode ? (
          <Card tone="brand" elevated={false}>
            <Text variant="caption" color={colors.muted}>
              {order.isGuestOrder
                ? "Pharmacist admin code"
                : "Show this at the branch counter"}
            </Text>
            <Text variant="display" style={{ marginTop: 6, letterSpacing: 2 }}>
              {order.pickupCode}
            </Text>
            <Text variant="bodySm" color={colors.muted} style={{ marginTop: 8 }}>
              {order.isGuestOrder
                ? "Share or screenshot so a pharmacist can create your order in admin."
                : order.anyBranch
                  ? "Valid at any Gishen Pharmacy branch for fulfillment."
                  : `Pickup at ${branch?.name ?? "selected branch"}.`}
            </Text>
            <Button
              title="Open share / copy card"
              variant="soft"
              icon="share-outline"
              style={{ marginTop: 14 }}
              onPress={() => router.push(routes.orderCode(order.id) as never)}
            />
          </Card>
        ) : null}

        <Section title="Items">
          <Card elevated={false}>
            {order.items.map((item, index) => (
              <View
                key={item.productId}
                style={{
                  flexDirection: "row",
                  gap: 12,
                  paddingVertical: 12,
                  borderBottomWidth: index === order.items.length - 1 ? 0 : 1,
                  borderBottomColor: colors.line,
                }}
              >
                <Image
                  source={{ uri: item.image }}
                  style={{
                    width: 52,
                    height: 52,
                    borderRadius: radii.sm,
                    backgroundColor: colors.surfaceAlt,
                  }}
                  resizeMode="contain"
                />
                <View style={{ flex: 1 }}>
                  <Text variant="h3">{item.name}</Text>
                  <Text variant="caption" color={colors.subtle} style={{ marginTop: 2 }}>
                    {item.unit} · Qty {item.quantity}
                    {item.requiresPrescription ? " · RX" : ""}
                  </Text>
                </View>
                <Text variant="label">{formatETB(item.price * item.quantity)}</Text>
              </View>
            ))}
          </Card>
        </Section>

        <Section title="Fulfillment">
          <Card elevated={false}>
            <InfoRow
              label="Method"
              value={order.fulfillment === "pickup" ? "Pickup" : "Delivery"}
            />
            <InfoRow label="Area" value={order.areaLabel || "—"} />
            {order.addressLine ? (
              <InfoRow label="Address" value={order.addressLine} />
            ) : null}
            {order.pickupCode ? (
              <InfoRow label="Pickup code" value={order.pickupCode} />
            ) : null}
            {branch ? (
              <InfoRow label="Branch" value={`${branch.name} · ${branch.hours}`} last />
            ) : (
              <InfoRow
                label="Branch"
                value={order.anyBranch ? "Any Gishen branch" : "—"}
                last
              />
            )}
          </Card>
        </Section>

        <Section title="Payment summary">
          <Card elevated={false}>
            <InfoRow label="Subtotal" value={formatETB(order.subtotal)} />
            {(order.discount ?? 0) > 0 ? (
              <InfoRow
                label={`Discount${order.voucherCode ? ` (${order.voucherCode})` : ""}`}
                value={`- ${formatETB(order.discount)}`}
                valueColor={colors.brandText}
              />
            ) : null}
            <InfoRow
              label="Delivery fee"
              value={order.deliveryFee ? formatETB(order.deliveryFee) : "Free"}
            />
            {(order.corporateCovered ?? 0) > 0 ? (
              <InfoRow
                label="Corporate covered"
                value={formatETB(order.corporateCovered!)}
                valueColor={colors.brandText}
              />
            ) : null}
            <InfoRow label="Payment method" value={order.paymentMethod} />
            <InfoRow
              label="Total"
              value={formatETB(order.total)}
              emphasis
              last
            />
          </Card>
        </Section>

        <Section title="Status timeline">
          <Card elevated={false}>
            {(order.timeline ?? []).map((step, index, arr) => (
              <View
                key={`${step.at}-${step.label}`}
                style={{ flexDirection: "row", gap: 12, paddingVertical: 8 }}
              >
                <View style={{ alignItems: "center", width: 18 }}>
                  <View
                    style={{
                      width: 10,
                      height: 10,
                      borderRadius: 5,
                      backgroundColor: colors.brand,
                      marginTop: 4,
                    }}
                  />
                  {index < arr.length - 1 ? (
                    <View
                      style={{
                        width: 2,
                        flex: 1,
                        backgroundColor: colors.brandBorder,
                        marginTop: 2,
                      }}
                    />
                  ) : null}
                </View>
                <View style={{ flex: 1, paddingBottom: 8 }}>
                  <Text variant="h3">{step.label}</Text>
                  <Text variant="caption" color={colors.subtle} style={{ marginTop: 2 }}>
                    {new Date(step.at).toLocaleString()}
                  </Text>
                </View>
              </View>
            ))}
          </Card>
        </Section>

        <View style={{ gap: 10 }}>
          {order.status !== "cancelled" && order.status !== "delivered" ? (
            <Button
              title="Track order"
              icon="navigate-outline"
              onPress={() => router.push(routes.tracking(order.id))}
            />
          ) : null}
          {order.status === "confirmed" || order.status === "paid" ? (
            <Button
              title="Simulate dispatch"
              variant="soft"
              onPress={() => updateStatus(order.id, "dispatched")}
            />
          ) : null}
          {canCancel ? (
            <Button
              title="Cancel order"
              variant="danger"
              onPress={() =>
                Alert.alert("Cancel order?", "This cannot be undone in the demo.", [
                  { text: "Keep", style: "cancel" },
                  {
                    text: "Cancel order",
                    style: "destructive",
                    onPress: () => cancelOrder(order.id),
                  },
                ])
              }
            />
          ) : null}
        </View>
      </ScrollView>
    </Screen>
  );
}