import { useCallback, useEffect, useRef, useState } from "react";
import {
  View,
  Text,
  FlatList,
  Pressable,
  ActivityIndicator,
} from "react-native";
import { router, useFocusEffect } from "expo-router";
import { getIncidents } from "@/lib/db";
import { useSettings } from "@/hooks/useSettings";
import type { Incident } from "@/types/incident";
import { Colors } from "@/constants/theme";

export default function HomeScreen() {
  const [incidents, setIncidents] = useState<Incident[]>([]);
  const [loading, setLoading] = useState(true);
  const { settings, ready } = useSettings();
  const didRedirect = useRef(false);

  useEffect(() => {
    if (!ready || didRedirect.current) return;
    if (settings.homeView === "capture") {
      didRedirect.current = true;
      router.push("/new");
    }
  }, [ready, settings.homeView]);

  useFocusEffect(
    useCallback(() => {
      loadIncidents();
    }, [])
  );

  async function loadIncidents() {
    setLoading(true);
    const data = await getIncidents(10);
    setIncidents(data);
    setLoading(false);
  }

  return (
    <View style={{ flex: 1, backgroundColor: Colors.bg }}>
      {loading ? (
        <ActivityIndicator
          color={Colors.primary}
          style={{ marginTop: 48 }}
        />
      ) : (
        <FlatList
          data={incidents}
          keyExtractor={(item) => item.id}
          contentContainerStyle={{ padding: 16, paddingBottom: 96 }}
          ListEmptyComponent={
            <Text
              style={{
                color: Colors.textDim,
                textAlign: "center",
                marginTop: 64,
                fontSize: 15,
              }}
            >
              No incidents. Press + to log one.
            </Text>
          }
          renderItem={({ item }) => (
            <Pressable
              onPress={() => router.push(`/incident/${item.id}`)}
              style={{
                backgroundColor: Colors.surface,
                borderRadius: 8,
                padding: 16,
                marginBottom: 10,
                borderLeftWidth: 3,
                borderLeftColor:
                  item.status === "open" ? Colors.warning : Colors.success,
              }}
            >
              <View
                style={{
                  flexDirection: "row",
                  justifyContent: "space-between",
                  alignItems: "center",
                  marginBottom: 4,
                }}
              >
                <Text
                  style={{
                    color: Colors.text1,
                    fontSize: 15,
                    fontWeight: "600",
                    flex: 1,
                  }}
                  numberOfLines={1}
                >
                  {item.title || "Untitled"}
                </Text>
                <View
                  style={{
                    backgroundColor:
                      item.status === "open"
                        ? "#f59e0b20"
                        : "#88D65620",
                    borderRadius: 4,
                    paddingHorizontal: 8,
                    paddingVertical: 2,
                    marginLeft: 8,
                  }}
                >
                  <Text
                    style={{
                      color:
                        item.status === "open"
                          ? Colors.warning
                          : Colors.success,
                      fontSize: 11,
                      fontWeight: "700",
                      textTransform: "uppercase",
                    }}
                  >
                    {item.status}
                  </Text>
                </View>
              </View>
              <Text
                style={{ color: Colors.text2, fontSize: 12 }}
                numberOfLines={1}
              >
                {item.service || "—"} · {item.createdAt.slice(0, 10)}
              </Text>
            </Pressable>
          )}
        />
      )}

      {/* FAB */}
      <Pressable
        onPress={() => router.push("/new")}
        style={{
          position: "absolute",
          bottom: 24,
          right: 24,
          width: 56,
          height: 56,
          borderRadius: 28,
          backgroundColor: Colors.primary,
          alignItems: "center",
          justifyContent: "center",
          elevation: 6,
        }}
      >
        <Text
          style={{ color: "#fff", fontSize: 28, lineHeight: 32 }}
        >
          +
        </Text>
      </Pressable>
    </View>
  );
}