import { Feather } from "@expo/vector-icons";
import { useQuery, useQueryClient } from "@tanstack/react-query";
import React, { useState } from "react";
import {
  ActivityIndicator,
  FlatList,
  Platform,
  RefreshControl,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from "react-native";
import { useSafeAreaInsets } from "react-native-safe-area-context";
import { PostCard } from "@/components/PostCard";
import { PostizPost, usePostiz } from "@/context/PostizContext";
import { useColors } from "@/hooks/useColors";

type FilterType = "all" | "QUEUE" | "PUBLISHED" | "ERROR" | "DRAFT";

const FILTERS: { key: FilterType; label: string }[] = [
  { key: "all", label: "All" },
  { key: "QUEUE", label: "Queue" },
  { key: "PUBLISHED", label: "Published" },
  { key: "DRAFT", label: "Draft" },
  { key: "ERROR", label: "Error" },
];

export default function PostsScreen() {
  const colors = useColors();
  const insets = useSafeAreaInsets();
  const { client, isConfigured } = usePostiz();
  const queryClient = useQueryClient();
  const [filter, setFilter] = useState<FilterType>("all");
  const [refreshing, setRefreshing] = useState(false);

  const start = new Date();
  start.setMonth(start.getMonth() - 3);
  const end = new Date();
  end.setMonth(end.getMonth() + 6);

  const { data: posts, isLoading, error, refetch } = useQuery<PostizPost[]>({
    queryKey: ["posts-list"],
    queryFn: async () => {
      if (!client) return [];
      const res = await client.get("/posts", {
        params: {
          startDate: start.toISOString(),
          endDate: end.toISOString(),
        },
      });
      return Array.isArray(res.data) ? res.data : res.data?.posts ?? [];
    },
    enabled: !!client,
    retry: 1,
  });

  const filteredPosts =
    filter === "all"
      ? posts ?? []
      : (posts ?? []).filter((p) => p.status === filter);

  const handleRefresh = async () => {
    setRefreshing(true);
    await refetch();
    setRefreshing(false);
  };

  const handleDelete = async (id: string) => {
    if (!client) return;
    try {
      await client.delete(`/posts/${id}`);
      queryClient.setQueryData<PostizPost[]>(["posts-list"], (old) =>
        (old ?? []).filter((p) => p.id !== id)
      );
      queryClient.invalidateQueries({ queryKey: ["posts"] });
    } catch (e) {
    }
  };

  if (!isConfigured) {
    return (
      <View
        style={[
          styles.centered,
          { backgroundColor: colors.background, paddingTop: Platform.OS === "web" ? 67 : 0 },
        ]}
      >
        <Feather name="lock" size={32} color={colors.mutedForeground} />
        <Text style={[styles.emptyTitle, { color: colors.foreground }]}>
          Not Configured
        </Text>
        <Text style={[styles.emptyText, { color: colors.mutedForeground }]}>
          Add your API key in Settings
        </Text>
      </View>
    );
  }

  return (
    <View
      style={[
        styles.container,
        {
          backgroundColor: colors.background,
          paddingTop: Platform.OS === "web" ? 67 : 0,
        },
      ]}
    >
      <FlatList
        horizontal
        data={FILTERS}
        keyExtractor={(item) => item.key}
        showsHorizontalScrollIndicator={false}
        contentContainerStyle={styles.filterList}
        renderItem={({ item }) => (
          <TouchableOpacity
            onPress={() => setFilter(item.key)}
            activeOpacity={0.7}
            style={[
              styles.filterChip,
              {
                backgroundColor:
                  filter === item.key ? colors.primary : colors.secondary,
                borderColor:
                  filter === item.key ? colors.primary : colors.border,
              },
            ]}
          >
            <Text
              style={[
                styles.filterText,
                {
                  color:
                    filter === item.key
                      ? colors.primaryForeground
                      : colors.mutedForeground,
                },
              ]}
            >
              {item.label}
            </Text>
          </TouchableOpacity>
        )}
        style={[styles.filterBar, { borderBottomColor: colors.border }]}
      />

      {isLoading ? (
        <View style={styles.centered}>
          <ActivityIndicator color={colors.primary} size="large" />
        </View>
      ) : error ? (
        <View style={styles.centered}>
          <Feather name="alert-circle" size={28} color={colors.error} />
          <Text style={[styles.emptyTitle, { color: colors.foreground }]}>
            Failed to load
          </Text>
          <TouchableOpacity
            onPress={() => refetch()}
            style={[styles.retryBtn, { backgroundColor: colors.primary }]}
          >
            <Text style={[styles.retryText, { color: colors.primaryForeground }]}>
              Try Again
            </Text>
          </TouchableOpacity>
        </View>
      ) : (
        <FlatList
          data={filteredPosts}
          keyExtractor={(item) => item.id}
          renderItem={({ item }) => (
            <PostCard post={item} onDelete={handleDelete} />
          )}
          refreshControl={
            <RefreshControl
              refreshing={refreshing}
              onRefresh={handleRefresh}
              tintColor={colors.primary}
            />
          }
          contentInsetAdjustmentBehavior="automatic"
          showsVerticalScrollIndicator={false}
          ListEmptyComponent={
            <View style={styles.emptyState}>
              <Feather name="inbox" size={36} color={colors.mutedForeground} />
              <Text style={[styles.emptyTitle, { color: colors.foreground }]}>
                No posts
              </Text>
              <Text style={[styles.emptyText, { color: colors.mutedForeground }]}>
                {filter === "all"
                  ? "No posts found in the last 3 months"
                  : `No ${filter.toLowerCase()} posts`}
              </Text>
            </View>
          }
          scrollEnabled={filteredPosts.length > 0}
        />
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  centered: {
    flex: 1,
    alignItems: "center",
    justifyContent: "center",
    gap: 10,
    paddingHorizontal: 32,
  },
  filterBar: {
    borderBottomWidth: StyleSheet.hairlineWidth,
    flexGrow: 0,
  },
  filterList: {
    paddingHorizontal: 16,
    paddingVertical: 10,
    gap: 8,
  },
  filterChip: {
    paddingHorizontal: 14,
    paddingVertical: 6,
    borderRadius: 20,
    borderWidth: 1,
  },
  filterText: {
    fontSize: 13,
    fontFamily: "Inter_500Medium",
  },
  emptyState: {
    alignItems: "center",
    paddingTop: 64,
    gap: 10,
  },
  emptyTitle: {
    fontSize: 18,
    fontFamily: "Inter_600SemiBold",
  },
  emptyText: {
    fontSize: 14,
    fontFamily: "Inter_400Regular",
    textAlign: "center",
  },
  retryBtn: {
    marginTop: 4,
    paddingHorizontal: 20,
    paddingVertical: 10,
    borderRadius: 10,
  },
  retryText: {
    fontSize: 14,
    fontFamily: "Inter_600SemiBold",
  },
});