import { memo, useMemo } from "react";
import { Pressable, Text, View } from "react-native";
import type { Particle, StreamProperties } from "@/api/types";
import { isParticleDeleted } from "@/api/types";
import { RelativeTimestamp } from "@/components/RelativeTimestamp";
import { useLiveLatestChild } from "@/hooks/use-particle";
import { useNetwork } from "@/hooks/use-networks";
import { particlePath } from "@/lib/particle-path";
import { cn, getInitials } from "@/lib/utils";
import { useAuthStore } from "@/stores/auth-store";

interface StreamCardProps {
  particle: Particle & { type: "stream"; properties: StreamProperties };
  networkId: string;
  onPress: () => void;
}

/**
 * Mobile counterpart of js/desktop/src/features/particles/stream-card.tsx —
 * same data wiring (subscribe to the latest child for unread + initials),
 * touch-tuned layout (single row, no preview thumbnail in v1).
 */
export const StreamCard = memo(function StreamCard({
  particle,
  networkId,
  onPress,
}: StreamCardProps) {
  const streamPath = particlePath(networkId, [particle.id]);
  const { latestChild } = useLiveLatestChild(streamPath);
  const userId = useAuthStore((s) => s.user?.id) ?? "";
  const network = useNetwork(networkId);

  const isDM =
    particle.visible_to.length === 2 &&
    particle.visible_to.every((v) => v.startsWith("human:"));

  const initials = useMemo(() => {
    if (isDM) {
      const otherEntry = particle.visible_to.find(
        (v) => v !== `human:${userId}`,
      );
      if (otherEntry) {
        const otherId = otherEntry.replace("human:", "");
        const otherHuman = network?.humans?.find((h) => h.id === otherId);
        if (otherHuman) return getInitials(otherHuman.email);
      }
    }

    if (latestChild) {
      const creator = network?.humans?.find(
        (h) => h.id === latestChild.created_by_human_id,
      );
      if (creator) return getInitials(creator.email);
    }

    return particle.properties.name.slice(0, 2).toUpperCase();
  }, [
    isDM,
    particle.visible_to,
    particle.properties.name,
    userId,
    latestChild,
    network,
  ]);

  const isUnseen = useMemo(() => {
    if (!latestChild) return false;
    const latestChildTimestamp = latestChild.created_at.getTime();
    const userPlaybackPosition =
      particle.playback_markers?.[userId]?.getTime() ?? 0;
    return latestChildTimestamp > userPlaybackPosition;
  }, [latestChild, particle.playback_markers, userId]);

  const previewLabel = useMemo(() => {
    if (!latestChild) return "No messages yet";
    if (isParticleDeleted(latestChild)) return "Message deleted";
    switch (latestChild.type) {
      case "media":
        return latestChild.properties.mime_type.startsWith("audio/")
          ? "Voice message"
          : "Video message";
      case "text":
        return latestChild.properties.content;
      case "file":
        return latestChild.properties.filename;
      case "quest":
        return latestChild.properties.title;
      case "paper":
        return latestChild.properties.title;
      default:
        return "Update";
    }
  }, [latestChild]);

  return (
    <Pressable
      onPress={onPress}
      android_ripple={{ color: "rgba(0,0,0,0.05)" }}
      className={cn(
        "bg-card rounded-xl border px-3.5 py-3 flex-row items-center gap-3 active:bg-accent",
        isUnseen ? "border-primary" : "border-border",
      )}
    >
      <View
        className={cn(
          "h-10 w-10 items-center justify-center rounded-full",
          isUnseen ? "bg-primary" : "bg-muted",
        )}
      >
        <Text
          className={cn(
            "text-xs font-semibold",
            isUnseen ? "text-primary-foreground" : "text-muted-foreground",
          )}
        >
          {initials}
        </Text>
      </View>

      <View className="flex-1">
        <Text
          numberOfLines={1}
          className={cn(
            "text-base",
            isUnseen
              ? "text-foreground font-semibold"
              : "text-foreground font-medium",
          )}
        >
          {particle.properties.name}
        </Text>
        <Text
          numberOfLines={1}
          className="text-muted-foreground mt-0.5 text-sm"
        >
          {previewLabel}
        </Text>
      </View>

      <View className="items-end gap-1">
        {latestChild ? (
          <RelativeTimestamp
            date={latestChild.created_at}
            className={cn(
              "text-xs",
              isUnseen ? "text-primary" : "text-muted-foreground",
            )}
          />
        ) : null}
        {isUnseen ? (
          <View className="bg-primary h-2 w-2 rounded-full" />
        ) : null}
      </View>
    </Pressable>
  );
});