import { Ionicons } from "@expo/vector-icons";
import { router } from "expo-router";
import { Image, Pressable, View } from "react-native";
import { AddButton } from "@/components/ui/Button";
import { Badge, Price, StockLabel } from "@/components/ui/Badge";
import { MetaTag } from "@/components/ui/Chip";
import { Text } from "@/components/ui/Text";
import { getDrugFacts } from "@/lib/data/clinical";
import type { Product } from "@/lib/data/products";
import { routes } from "@/lib/routes";
import { useCartStore } from "@/lib/stores/cartStore";
import { useFavoritesStore } from "@/lib/stores/favoritesStore";
import { colors, radii, shadows, space } from "@/lib/theme";
import { formatETB } from "@/lib/utils";

export const GRID_CARD_GAP = 12;

function discount(product: Product) {
  if (!product.compareAt || product.compareAt <= product.price) return null;
  return `${Math.round(((product.compareAt - product.price) / product.compareAt) * 100)}% OFF`;
}

function useCardActions(product: Product) {
  const addProduct = useCartStore((s) => s.addProduct);
  return {
    open: () => router.push(routes.product(product.id)),
    add: () => addProduct(product, 1),
  };
}

/** Grid tile used in shop, search results and category listings. */
export function ProductCard({
  product,
  width,
}: {
  product: Product;
  width?: number | `${number}%`;
}) {
  const { open, add } = useCardActions(product);
  const facts = getDrugFacts(product);
  const off = discount(product);

  return (
    <Pressable
      onPress={open}
      style={({ pressed }) => [
        {
          width,
          backgroundColor: colors.surface,
          borderRadius: radii.card,
          borderWidth: 1,
          borderColor: colors.line,
          padding: space.md,
          opacity: pressed ? 0.94 : 1,
        },
        shadows.xs,
      ]}
    >
      <View
        style={{
          height: 108,
          borderRadius: radii.sm,
          backgroundColor: colors.surfaceAlt,
          alignItems: "center",
          justifyContent: "center",
          overflow: "hidden",
        }}
      >
        <Image
          source={{ uri: product.image }}
          style={{ width: "82%", height: "82%" }}
          resizeMode="contain"
        />
        {off ? (
          <Badge label={off} solid style={{ position: "absolute", top: 8, left: 8 }} />
        ) : null}
        {product.requiresPrescription ? (
          <Badge
            label="RX"
            tone="info"
            style={{ position: "absolute", top: 8, right: 8 }}
          />
        ) : null}
      </View>

      <Text variant="micro" color={colors.subtle} style={{ marginTop: 10 }}>
        {facts.useCase}
      </Text>
      <Text variant="h3" numberOfLines={2} style={{ marginTop: 2, minHeight: 40 }}>
        {product.name}
      </Text>

      <View style={{ marginTop: 6 }}>
        <Price value={product.price} compareAt={product.compareAt} format={formatETB} />
      </View>

      <View style={{ flexDirection: "row", alignItems: "center", gap: 10, marginTop: 8 }}>
        <MetaTag label={facts.form} icon="ellipse-outline" />
        <MetaTag label={product.unit} />
      </View>

      <View
        style={{
          flexDirection: "row",
          alignItems: "center",
          justifyContent: "space-between",
          marginTop: 10,
        }}
      >
        <StockLabel inStock={product.inStock} count={facts.stockCount} />
        <AddButton onPress={add} disabled={!product.inStock} />
      </View>
    </Pressable>
  );
}

/** Horizontal row used in "Most popular", favorites and list-view results. */
export function ProductRow({ product }: { product: Product }) {
  const { open, add } = useCardActions(product);
  const facts = getDrugFacts(product);

  return (
    <Pressable
      onPress={open}
      style={({ pressed }) => [
        {
          flexDirection: "row",
          gap: space.md,
          backgroundColor: colors.surface,
          borderRadius: radii.card,
          borderWidth: 1,
          borderColor: colors.line,
          padding: space.md,
          alignItems: "center",
          opacity: pressed ? 0.94 : 1,
        },
        shadows.xs,
      ]}
    >
      <View
        style={{
          width: 66,
          height: 66,
          borderRadius: radii.sm,
          backgroundColor: colors.surfaceAlt,
          alignItems: "center",
          justifyContent: "center",
          overflow: "hidden",
        }}
      >
        <Image
          source={{ uri: product.image }}
          style={{ width: "80%", height: "80%" }}
          resizeMode="contain"
        />
      </View>

      <View style={{ flex: 1 }}>
        <Text variant="micro" color={colors.subtle}>
          {facts.useCase}
        </Text>
        <Text variant="h3" numberOfLines={1} style={{ marginTop: 1 }}>
          {product.name}
        </Text>
        <View style={{ marginTop: 4 }}>
          <Price value={product.price} compareAt={product.compareAt} format={formatETB} />
        </View>
        <View style={{ flexDirection: "row", alignItems: "center", gap: 10, marginTop: 5 }}>
          <MetaTag label={facts.form} icon="ellipse-outline" />
          <StockLabel inStock={product.inStock} count={facts.stockCount} />
        </View>
      </View>

      <AddButton onPress={add} disabled={!product.inStock} />
    </Pressable>
  );
}

/** Compact tile for horizontal carousels on the home screen. */
export function ProductTile({ product }: { product: Product }) {
  const { open, add } = useCardActions(product);
  const liked = useFavoritesStore((s) => s.has(product.id));
  const toggle = useFavoritesStore((s) => s.toggle);
  const off = discount(product);

  return (
    <Pressable
      onPress={open}
      style={({ pressed }) => [
        {
          width: 158,
          backgroundColor: colors.surface,
          borderRadius: radii.card,
          borderWidth: 1,
          borderColor: colors.line,
          padding: space.md,
          opacity: pressed ? 0.94 : 1,
        },
        shadows.xs,
      ]}
    >
      <View
        style={{
          height: 96,
          borderRadius: radii.sm,
          backgroundColor: colors.surfaceAlt,
          alignItems: "center",
          justifyContent: "center",
          overflow: "hidden",
        }}
      >
        <Image
          source={{ uri: product.image }}
          style={{ width: "82%", height: "82%" }}
          resizeMode="contain"
        />
        {off ? (
          <Badge label={off} solid style={{ position: "absolute", top: 6, left: 6 }} />
        ) : null}
        <Pressable
          onPress={() => toggle(product.id)}
          hitSlop={8}
          style={{
            position: "absolute",
            top: 6,
            right: 6,
            width: 26,
            height: 26,
            borderRadius: 13,
            backgroundColor: colors.surface,
            alignItems: "center",
            justifyContent: "center",
          }}
        >
          <Ionicons
            name={liked ? "heart" : "heart-outline"}
            size={14}
            color={liked ? colors.danger : colors.muted}
          />
        </Pressable>
      </View>

      <Text variant="h3" numberOfLines={2} style={{ marginTop: 10, minHeight: 40 }}>
        {product.name}
      </Text>
      <View style={{ marginTop: 4 }}>
        <Price value={product.price} compareAt={product.compareAt} size="sm" format={formatETB} />
      </View>
      <View
        style={{
          flexDirection: "row",
          alignItems: "center",
          justifyContent: "space-between",
          marginTop: 8,
        }}
      >
        <StockLabel inStock={product.inStock} />
        <AddButton onPress={add} disabled={!product.inStock} size={30} />
      </View>
    </Pressable>
  );
}