"use client";

import { useEffect, useState } from "react";
import { collection, onSnapshot, query, orderBy, limit, where, FirestoreError } from "firebase/firestore";
import { onAuthStateChanged } from "firebase/auth";
import { db, auth } from "@/lib/firebase";
import type { CallRecord } from "@/lib/types";

export function useCalls(limitCount = 50) {
  const [calls, setCalls] = useState<CallRecord[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    let unsubFirestore: (() => void) | undefined;

    const unsubAuth = onAuthStateChanged(auth, (user) => {
      if (unsubFirestore) { unsubFirestore(); unsubFirestore = undefined; }

      if (!user) {
        setCalls([]);
        setLoading(false);
        return;
      }

      const q = query(
        collection(db, "calls"),
        orderBy("started_at", "desc"),
        limit(limitCount)
      );
      const toISO = (v: any): string | null =>
        v?.toDate?.()?.toISOString?.() ?? (typeof v === "string" ? v : null);
      unsubFirestore = onSnapshot(q, (snap) => {
        setCalls(snap.docs.map((d) => {
          const data = d.data();
          return { ...data, started_at: toISO(data.started_at) ?? "", ended_at: toISO(data.ended_at) } as CallRecord;
        }));
        setLoading(false);
      }, (err: FirestoreError) => { console.error("useCalls:", err); setError(err.message); setLoading(false); });
    });

    return () => {
      unsubAuth();
      if (unsubFirestore) unsubFirestore();
    };
  }, [limitCount]);

  return { calls, loading, error };
}

export function useCallsByIncident(incidentId: string | null) {
  const [calls, setCalls] = useState<CallRecord[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    if (!incidentId) { setLoading(false); return; }
    let unsubFirestore: (() => void) | undefined;

    const unsubAuth = onAuthStateChanged(auth, (user) => {
      if (unsubFirestore) { unsubFirestore(); unsubFirestore = undefined; }
      if (!user) { setLoading(false); return; }

      const toISO = (v: any): string | null =>
        v?.toDate?.()?.toISOString?.() ?? (typeof v === "string" ? v : null);

      const q = query(collection(db, "calls"), where("incident_id", "==", incidentId));
      unsubFirestore = onSnapshot(q, (snap) => {
        const docs = snap.docs.map((d) => {
          const data = d.data();
          return { ...data, started_at: toISO(data.started_at) ?? "", ended_at: toISO(data.ended_at) } as CallRecord;
        });
        docs.sort((a, b) => a.started_at.localeCompare(b.started_at));
        setCalls(docs);
        setLoading(false);
      }, (err: FirestoreError) => { console.error("useCallsByIncident:", err); setLoading(false); });
    });

    return () => { unsubAuth(); if (unsubFirestore) unsubFirestore(); };
  }, [incidentId]);

  return { calls, loading };
}

export function useActiveCalls() {
  const [calls, setCalls] = useState<CallRecord[]>([]);

  useEffect(() => {
    let unsubFirestore: (() => void) | undefined;

    const unsubAuth = onAuthStateChanged(auth, (user) => {
      if (unsubFirestore) { unsubFirestore(); unsubFirestore = undefined; }

      if (!user) {
        setCalls([]);
        return;
      }

      const q = query(collection(db, "calls"), where("status", "==", "active"));
      const toISO = (v: any): string | null =>
        v?.toDate?.()?.toISOString?.() ?? (typeof v === "string" ? v : null);
      unsubFirestore = onSnapshot(q, (snap) => {
        setCalls(snap.docs.map((d) => {
          const data = d.data();
          return { ...data, started_at: toISO(data.started_at) ?? "", ended_at: toISO(data.ended_at) } as CallRecord;
        }));
      }, (err: FirestoreError) => { console.error("useActiveCalls:", err); });
    });

    return () => {
      unsubAuth();
      if (unsubFirestore) unsubFirestore();
    };
  }, []);

  return calls;
}