import { Feather, MaterialCommunityIcons } from "@expo/vector-icons";
import React, { useCallback } from "react";
import {
  FlatList,
  ListRenderItemInfo,
  Platform,
  StyleSheet,
  Text,
  View,
} from "react-native";
import { useSafeAreaInsets } from "react-native-safe-area-context";

import { Colors } from "@/constants/colors";
import { useTimmy, type WsEvent } from "@/context/TimmyContext";

const C = Colors.dark;

type FeatherIconName = React.ComponentProps<typeof Feather>["name"];
type MCIconName = React.ComponentProps<typeof MaterialCommunityIcons>["name"];

type EventConfig =
  | {
      color: string;
      iconFamily: "Feather";
      icon: FeatherIconName;
      label: (e: WsEvent) => string;
    }
  | {
      color: string;
      iconFamily: "MaterialCommunityIcons";
      icon: MCIconName;
      label: (e: WsEvent) => string;
    };

const EVENT_CONFIG: Record<string, EventConfig> = {
  job_started: {
    color: C.jobStarted,
    icon: "play-circle",
    iconFamily: "Feather",
    label: (e) => `Job started${e.agentId ? ` · ${e.agentId}` : ""}`,
  },
  job_completed: {
    color: C.jobCompleted,
    icon: "check-circle",
    iconFamily: "Feather",
    label: (e) => `Job completed${e.agentId ? ` · ${e.agentId}` : ""}`,
  },
  chat: {
    color: C.chat,
    icon: "message-circle",
    iconFamily: "Feather",
    label: (e) =>
      e.agentId === "timmy"
        ? `Timmy: ${e.text ?? ""}`
        : `${e.agentId ?? "visitor"}: ${e.text ?? ""}`,
  },
  agent_state: {
    color: C.agentState,
    icon: "cpu",
    iconFamily: "Feather",
    label: (e) => `${e.agentId ?? "agent"} → ${e.state ?? "?"}`,
  },
  visitor_count: {
    color: "#8B5CF6",
    icon: "users",
    iconFamily: "Feather",
    label: (e) => `${e.count ?? 0} visitor${e.count !== 1 ? "s" : ""} online`,
  },
};

const FALLBACK_CONFIG: EventConfig = {
  color: C.textMuted,
  icon: "radio",
  iconFamily: "Feather",
  label: (e) => e.type,
};

function EventIcon({ config }: { config: EventConfig }) {
  if (config.iconFamily === "MaterialCommunityIcons") {
    return (
      <MaterialCommunityIcons
        name={config.icon}
        size={16}
        color={config.color}
      />
    );
  }
  return <Feather name={config.icon} size={16} color={config.color} />;
}

function EventRow({ item }: { item: WsEvent }) {
  const config = EVENT_CONFIG[item.type] ?? FALLBACK_CONFIG;
  const label = config.label(item);
  const time = new Date(item.timestamp).toLocaleTimeString([], {
    hour: "2-digit",
    minute: "2-digit",
    second: "2-digit",
  });

  return (
    <View style={styles.row}>
      <View style={[styles.iconBadge, { backgroundColor: config.color + "22" }]}>
        <EventIcon config={config} />
      </View>
      <View style={styles.rowContent}>
        <Text style={styles.rowLabel} numberOfLines={2}>
          {label}
        </Text>
        <Text style={[styles.rowType, { color: config.color }]}>
          {item.type.replace(/_/g, " ")}
        </Text>
      </View>
      <Text style={styles.rowTime}>{time}</Text>
    </View>
  );
}

const keyExtractor = (item: WsEvent) => item.id;
const renderItem = ({ item }: ListRenderItemInfo<WsEvent>) => (
  <EventRow item={item} />
);

export default function FeedScreen() {
  const { recentEvents, connectionStatus } = useTimmy();
  const insets = useSafeAreaInsets();
  const topPad = Platform.OS === "web" ? 67 : insets.top;
  const bottomPad = Platform.OS === "web" ? 84 + 34 : insets.bottom + 84;

  const ListEmpty = useCallback(
    () => (
      <View style={styles.emptyContainer}>
        <Feather name="radio" size={48} color={C.textMuted} />
        <Text style={styles.emptyTitle}>Waiting for events</Text>
        <Text style={styles.emptySubtitle}>
          {connectionStatus === "connected"
            ? "Events will appear here as Timmy works"
            : "Connect to the API server to see live events"}
        </Text>
      </View>
    ),
    [connectionStatus]
  );

  return (
    <View style={[styles.container, { paddingTop: topPad }]}>
      <View style={styles.header}>
        <View>
          <Text style={styles.title}>Live Feed</Text>
          <Text style={styles.subtitle}>
            {recentEvents.length} event{recentEvents.length !== 1 ? "s" : ""}
          </Text>
        </View>
        <View style={styles.countBadge}>
          <Text style={styles.countText}>{recentEvents.length}</Text>
        </View>
      </View>

      <FlatList<WsEvent>
        data={recentEvents}
        keyExtractor={keyExtractor}
        renderItem={renderItem}
        ListEmptyComponent={ListEmpty}
        contentContainerStyle={[
          styles.listContent,
          { paddingBottom: bottomPad },
        ]}
        showsVerticalScrollIndicator={false}
        ItemSeparatorComponent={() => <View style={styles.separator} />}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: C.background,
  },
  header: {
    flexDirection: "row",
    justifyContent: "space-between",
    alignItems: "flex-start",
    paddingHorizontal: 24,
    paddingTop: 12,
    paddingBottom: 16,
  },
  title: {
    fontSize: 28,
    fontFamily: "Inter_700Bold",
    color: C.text,
    letterSpacing: -0.5,
  },
  subtitle: {
    fontSize: 13,
    fontFamily: "Inter_400Regular",
    color: C.textSecondary,
    marginTop: 2,
  },
  countBadge: {
    backgroundColor: C.surface,
    borderRadius: 20,
    paddingHorizontal: 12,
    paddingVertical: 4,
    borderWidth: 1,
    borderColor: C.border,
    alignSelf: "flex-start",
    marginTop: 8,
  },
  countText: {
    fontSize: 13,
    fontFamily: "Inter_600SemiBold",
    color: C.textSecondary,
  },
  listContent: {
    paddingHorizontal: 16,
    flexGrow: 1,
  },
  row: {
    flexDirection: "row",
    alignItems: "flex-start",
    gap: 12,
    paddingVertical: 12,
    paddingHorizontal: 4,
  },
  iconBadge: {
    width: 36,
    height: 36,
    borderRadius: 10,
    alignItems: "center",
    justifyContent: "center",
    flexShrink: 0,
  },
  rowContent: {
    flex: 1,
    gap: 3,
  },
  rowLabel: {
    fontSize: 13,
    fontFamily: "Inter_400Regular",
    color: C.text,
    lineHeight: 18,
  },
  rowType: {
    fontSize: 11,
    fontFamily: "Inter_500Medium",
    textTransform: "uppercase",
    letterSpacing: 0.5,
  },
  rowTime: {
    fontSize: 11,
    fontFamily: "Inter_400Regular",
    color: C.textMuted,
    flexShrink: 0,
    marginTop: 2,
  },
  separator: {
    height: 1,
    backgroundColor: C.border,
    opacity: 0.5,
  },
  emptyContainer: {
    flex: 1,
    alignItems: "center",
    justifyContent: "center",
    paddingTop: 80,
    gap: 12,
    paddingHorizontal: 40,
  },
  emptyTitle: {
    fontSize: 18,
    fontFamily: "Inter_600SemiBold",
    color: C.textSecondary,
    marginTop: 8,
  },
  emptySubtitle: {
    fontSize: 14,
    fontFamily: "Inter_400Regular",
    color: C.textMuted,
    textAlign: "center",
    lineHeight: 20,
  },
});