"use client";

import { useState, useEffect } from "react";
import { useQuery, useQueryClient } from "@tanstack/react-query";
import { EVENT_CONFIG, EventType, formatTimeAgo, formatDuration } from "@/lib/event-config";
import { EventModal } from "@/components/event-modal";
import { EventIcon } from "@/components/event-icon";
import { useBaby } from "@/contexts/baby-context";
import { checkFeedAlert, getThresholds } from "@/lib/notifications";
import { format, isToday } from "date-fns";
import { fr } from "date-fns/locale";
import { AlertTriangle, Clock, CheckCircle2 } from "lucide-react";

const QUICK_LOG_TYPES: EventType[] = [
  "BREASTFEED",
  "BOTTLE",
  "PUMP",
  "DIAPER_WET",
  "DIAPER_STOOL",
  "NAP",
  "NIGHT_SLEEP",
  "MEDICATION",
  "TEMPERATURE",
];

interface Event {
  id: string;
  type: EventType;
  startedAt: string;
  endedAt?: string;
  notes?: string;
  metadata?: Record<string, unknown>;
  user: { id: string; name: string };
}

function getBabyAge(birthDate: string): string {
  const birth = new Date(birthDate);
  const now = new Date();
  const days = Math.floor((now.getTime() - birth.getTime()) / 86400000);
  if (days < 7) return `${days} jour${days !== 1 ? "s" : ""}`;
  const weeks = Math.floor(days / 7);
  if (weeks < 8) return `${weeks} semaine${weeks !== 1 ? "s" : ""}`;
  const months = Math.floor(days / 30);
  return `${months} mois`;
}

function getEventSummary(event: Event): string {
  const meta = event.metadata ?? {};
  if (event.type === "BREASTFEED") {
    const side = meta.breastSide === "left" ? "gauche" : meta.breastSide === "right" ? "droite" : "les deux";
    if (event.endedAt) return `${formatDuration(new Date(event.startedAt), new Date(event.endedAt))} · ${side}`;
    return side;
  }
  if (event.type === "BOTTLE") {
    return [meta.volume ? `${meta.volume} mL` : "", meta.bottleType === "maternal" ? "maternel" : "artificiel"].filter(Boolean).join(" · ");
  }
  if (event.type === "DIAPER_STOOL") return String(meta.color ?? "");
  if (event.type === "TEMPERATURE") return meta.value ? `${meta.value}°${meta.unit ?? "C"}` : "";
  if (event.type === "MEDICATION") return String(meta.name ?? "");
  if ((event.type === "NAP" || event.type === "NIGHT_SLEEP") && event.endedAt) {
    return formatDuration(new Date(event.startedAt), new Date(event.endedAt));
  }
  return "";
}

export default function DashboardPage() {
  const qc = useQueryClient();
  const [activeModal, setActiveModal] = useState<EventType | null>(null);
  const { selectedBaby, isLoading: familyLoading } = useBaby();

  const { data: eventsData } = useQuery({
    queryKey: ["events", selectedBaby?.id],
    queryFn: () => fetch(`/api/events?babyId=${selectedBaby!.id}&limit=50`).then((r) => r.json()),
    enabled: !!selectedBaby?.id,
    refetchInterval: 10_000,
  });

  const events: Event[] = eventsData?.events ?? [];

  useEffect(() => {
    const lastFeed = events.find((e) => e.type === "BREASTFEED" || e.type === "BOTTLE");
    checkFeedAlert(lastFeed ? new Date(lastFeed.startedAt) : null, getThresholds());
    const id = setInterval(() => {
      checkFeedAlert(lastFeed ? new Date(lastFeed.startedAt) : null, getThresholds());
    }, 5 * 60 * 1000);
    return () => clearInterval(id);
  }, [events]);

  const lastByType: Partial<Record<EventType, Event>> = {};
  for (const ev of events) {
    if (!lastByType[ev.type]) lastByType[ev.type] = ev;
  }

  const todayEvents = events.filter((e) => isToday(new Date(e.startedAt)));
  const todayCounts: Partial<Record<EventType, number>> = {};
  for (const ev of todayEvents) todayCounts[ev.type] = (todayCounts[ev.type] ?? 0) + 1;

  const { data: medProfiles = [] } = useQuery<{ id: string; name: string; molecule: string | null; intervalHours: number; minIntervalHours: number | null }[]>({
    queryKey: ["med-profiles"],
    queryFn: () => fetch("/api/medication-profiles").then((r) => r.json()),
    enabled: !!selectedBaby?.id,
  });

  const { data: lastIntakes = {} } = useQuery<Record<string, { startedAt: string }>>({
    queryKey: ["last-intakes", selectedBaby?.id],
    queryFn: () => fetch(`/api/medication-profiles/last-intakes?babyId=${selectedBaby!.id}`).then((r) => r.json()),
    enabled: !!selectedBaby?.id,
    refetchInterval: 30_000,
  });

  if (familyLoading) {
    return (
      <div className="flex items-center justify-center min-h-screen">
        <div className="w-6 h-6 border-2 border-indigo-600 border-t-transparent rounded-full animate-spin" />
      </div>
    );
  }

  if (!selectedBaby) {
    return (
      <div className="flex flex-col items-center justify-center min-h-screen p-8 text-center">
        <p className="text-slate-500 mb-4">Aucun bébé enregistré.</p>
        <a href="/setup" className="bg-indigo-600 text-white px-5 py-2.5 rounded-lg font-medium hover:bg-indigo-700 transition text-sm">
          Ajouter un bébé
        </a>
      </div>
    );
  }

  return (
    <div className="p-4 md:p-8 pb-24 md:pb-8">
      {/* Page header */}
      <div className="flex items-start justify-between mb-6">
        <div>
          <h1 className="text-2xl font-bold text-slate-900 dark:text-slate-100">{selectedBaby.name}</h1>
          <p className="text-slate-500 dark:text-slate-400 text-sm mt-0.5">{getBabyAge(selectedBaby.birthDate)}</p>
        </div>
        <div className="text-right">
          <p className="text-slate-400 dark:text-slate-500 text-xs">Aujourd&apos;hui</p>
          <p className="text-slate-700 dark:text-slate-200 font-medium text-sm capitalize">
            {format(new Date(), "EEEE d MMMM", { locale: fr })}
          </p>
        </div>
      </div>

      {/* Today's summary counters */}
      <div className="grid grid-cols-4 gap-3 mb-6">
        {(["BREASTFEED", "BOTTLE", "DIAPER_WET", "DIAPER_STOOL"] as EventType[]).map((t) => {
          const cfg = EVENT_CONFIG[t];
          return (
            <div key={t} className="bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 rounded-xl p-3 text-center">
              <EventIcon name={cfg.icon} className={`w-5 h-5 mx-auto mb-1.5 ${cfg.colorClass}`} />
              <div className="text-2xl font-bold text-slate-900 dark:text-slate-100">{todayCounts[t] ?? 0}</div>
              <div className="text-xs text-slate-400 dark:text-slate-500 mt-0.5 leading-tight">{cfg.label.split(" ")[0]}</div>
            </div>
          );
        })}
      </div>

      <div className="grid md:grid-cols-2 gap-6">
        {/* Last events */}
        <div>
          <h2 className="text-xs font-semibold text-slate-400 dark:text-slate-500 uppercase tracking-wider mb-3">Dernières activités</h2>
          <div className="bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 rounded-xl overflow-hidden divide-y divide-slate-100 dark:divide-slate-700">
            {(["BREASTFEED", "BOTTLE", "DIAPER_WET", "DIAPER_STOOL", "NAP"] as EventType[]).map((t) => {
              const last = lastByType[t];
              const cfg = EVENT_CONFIG[t];
              return (
                <div key={t} className="flex items-center gap-3 px-4 py-3">
                  <div className={`w-8 h-8 rounded-lg ${cfg.bgClass} flex items-center justify-center flex-shrink-0`}>
                    <EventIcon name={cfg.icon} className={`w-4 h-4 ${cfg.colorClass}`} />
                  </div>
                  <div className="flex-1 min-w-0">
                    <div className="text-sm font-medium text-slate-700 dark:text-slate-200">{cfg.label}</div>
                    {last && getEventSummary(last) && (
                      <div className="text-xs text-slate-400 dark:text-slate-500 truncate">{getEventSummary(last)}</div>
                    )}
                  </div>
                  <div className="text-xs text-slate-400 dark:text-slate-500 flex-shrink-0">
                    {last ? formatTimeAgo(new Date(last.startedAt)) : "—"}
                  </div>
                </div>
              );
            })}
          </div>
        </div>

        {/* Quick log */}
        <div>
          <h2 className="text-xs font-semibold text-slate-400 dark:text-slate-500 uppercase tracking-wider mb-3">Enregistrer</h2>
          <div className="grid grid-cols-4 md:grid-cols-4 gap-2">
            {QUICK_LOG_TYPES.map((type) => {
              const cfg = EVENT_CONFIG[type];
              return (
                <button
                  key={type}
                  onClick={() => setActiveModal(type)}
                  className="bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 hover:border-slate-300 hover:shadow-sm rounded-xl p-3 flex flex-col items-center gap-2 transition active:scale-95"
                >
                  <div className={`w-9 h-9 rounded-lg ${cfg.bgClass} flex items-center justify-center`}>
                    <EventIcon name={cfg.icon} className={`w-5 h-5 ${cfg.colorClass}`} />
                  </div>
                  <span className="text-[10px] font-medium text-slate-600 dark:text-slate-300 text-center leading-tight">
                    {cfg.label}
                  </span>
                </button>
              );
            })}
          </div>
        </div>
      </div>

      {/* Medication status */}
      {medProfiles.length > 0 && (() => {
        const activeMeds = medProfiles.filter((p) => lastIntakes[p.name]);
        if (activeMeds.length === 0) return null;
        return (
          <div className="mt-6">
            <h2 className="text-xs font-semibold text-slate-400 dark:text-slate-500 uppercase tracking-wider mb-3">Médicaments</h2>
            <div className="bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 rounded-xl overflow-hidden divide-y divide-slate-100 dark:divide-slate-700">
              {activeMeds.map((p) => {
                const intake = lastIntakes[p.name];
                const nextAt = new Date(new Date(intake.startedAt).getTime() + p.intervalHours * 3600000);
                const waitMs = nextAt.getTime() - Date.now();
                const tooSoon = waitMs > 0;
                const h = Math.floor(Math.abs(waitMs) / 3600000);
                const m = Math.floor((Math.abs(waitMs) % 3600000) / 60000);
                const timeLabel = h > 0 ? `${h}h${m.toString().padStart(2, "0")}` : `${m}min`;
                return (
                  <div key={p.id} className="flex items-center gap-3 px-4 py-3">
                    <div className={`w-8 h-8 rounded-lg flex items-center justify-center flex-shrink-0 ${tooSoon ? "bg-red-50 dark:bg-red-950" : "bg-green-50 dark:bg-green-950"}`}>
                      {tooSoon
                        ? <AlertTriangle className="w-4 h-4 text-red-500" />
                        : <CheckCircle2 className="w-4 h-4 text-green-500" />
                      }
                    </div>
                    <div className="flex-1 min-w-0">
                      <p className="text-sm font-medium text-slate-700 dark:text-slate-200">{p.name}</p>
                      {p.molecule && <p className="text-xs text-slate-400 dark:text-slate-500">{p.molecule}</p>}
                    </div>
                    <div className="text-right flex-shrink-0">
                      {tooSoon ? (
                        <p className="text-xs font-semibold text-red-600 dark:text-red-400">Dans {timeLabel}</p>
                      ) : (
                        <p className="text-xs font-semibold text-green-600 dark:text-green-400">Disponible</p>
                      )}
                      <p className="text-[10px] text-slate-400 dark:text-slate-500 mt-0.5 flex items-center gap-1 justify-end">
                        <Clock className="w-2.5 h-2.5" />{format(nextAt, "HH:mm")}
                      </p>
                    </div>
                  </div>
                );
              })}
            </div>
          </div>
        );
      })()}

      {/* Today's timeline */}
      {todayEvents.length > 0 && (
        <div className="mt-6">
          <h2 className="text-xs font-semibold text-slate-400 dark:text-slate-500 uppercase tracking-wider mb-3">
            Aujourd&apos;hui · {todayEvents.length} événement{todayEvents.length > 1 ? "s" : ""}
          </h2>
          <div className="bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 rounded-xl overflow-hidden divide-y divide-slate-100 dark:divide-slate-700">
            {todayEvents.slice(0, 10).map((ev) => {
              const cfg = EVENT_CONFIG[ev.type];
              return (
                <div key={ev.id} className="flex items-center gap-3 px-4 py-3">
                  <div className={`w-8 h-8 rounded-lg ${cfg.bgClass} flex items-center justify-center flex-shrink-0`}>
                    <EventIcon name={cfg.icon} className={`w-4 h-4 ${cfg.colorClass}`} />
                  </div>
                  <div className="flex-1 min-w-0">
                    <span className="text-sm font-medium text-slate-700 dark:text-slate-200">{cfg.label}</span>
                    {getEventSummary(ev) && (
                      <span className="text-xs text-slate-400 dark:text-slate-500 ml-2">{getEventSummary(ev)}</span>
                    )}
                  </div>
                  <span className="text-xs text-slate-400 dark:text-slate-500 flex-shrink-0 font-mono">
                    {format(new Date(ev.startedAt), "HH:mm")}
                  </span>
                </div>
              );
            })}
          </div>
        </div>
      )}

      {activeModal && (
        <EventModal
          type={activeModal}
          babyId={selectedBaby.id}
          onClose={() => setActiveModal(null)}
          onSaved={() => qc.invalidateQueries({ queryKey: ["events"] })}
        />
      )}
    </div>
  );
}