'use client';

import React, { useState, useEffect } from 'react';
import { Activity, CheckCircle, Clock, XCircle, Zap, Filter } from 'lucide-react';
import { Spinner } from '@/components/ui/Spinner';

interface LogEntry {
  id: string;
  timestamp: string;
  campaign_name: string;
  rule_name: string;
  action: string;
  details: string;
  status: 'executed' | 'pending' | 'failed' | 'skipped';
}

const statusConfig = {
  executed: { icon: <CheckCircle size={14} />, color: '#4ade80', bg: 'rgba(34,197,94,0.1)', label: 'Executado' },
  pending: { icon: <Clock size={14} />, color: '#fbbf24', bg: 'rgba(245,158,11,0.1)', label: 'Pendente' },
  failed: { icon: <XCircle size={14} />, color: '#f87171', bg: 'rgba(239,68,68,0.1)', label: 'Falhou' },
  skipped: { icon: <Clock size={14} />, color: '#8888a0', bg: 'var(--overlay-05)', label: 'Pulado' },
};

function timeAgo(dateStr: string): string {
  const diff = Date.now() - new Date(dateStr).getTime();
  const mins = Math.floor(diff / 60000);
  if (mins < 60) return `${mins}min atrás`;
  const hours = Math.floor(mins / 60);
  if (hours < 24) return `${hours}h atrás`;
  const days = Math.floor(hours / 24);
  return `${days}d atrás`;
}

export default function ActivityPage() {
  const [filter, setFilter] = useState<string>('all');
  const [allLogs, setAllLogs] = useState<LogEntry[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    (async () => {
      try {
        const res = await fetch('/api/engine/logs');
        const data = await res.json();
        if (data.success) setAllLogs(data.data || []);
      } catch {
        /* ignora */
      } finally {
        setLoading(false);
      }
    })();
  }, []);

  const logs = filter === 'all' ? allLogs : allLogs.filter((l) => l.status === filter);

  return (
    <div className="flex flex-col gap-6">
      {/* Header */}
      <div className="flex items-center justify-between animate-fade-in-up">
        <div className="flex items-center gap-3">
          <div className="w-10 h-10 rounded-xl flex items-center justify-center" style={{ background: 'rgba(34,197,94,0.15)', border: '1px solid rgba(34,197,94,0.25)' }}>
            <Activity size={20} style={{ color: '#4ade80' }} />
          </div>
          <div>
            <h1 className="text-2xl font-bold text-white">Atividade</h1>
            <p className="text-sm" style={{ color: 'var(--muted-fg)' }}>Ações executadas pelo agente de automação</p>
          </div>
        </div>
        <div className="flex items-center gap-1 p-1 rounded-xl" style={{ background: 'var(--overlay-03)', border: '1px solid var(--overlay-06)' }}>
          <Filter size={14} className="ml-2" style={{ color: 'var(--muted-fg)' }} />
          {['all', 'executed', 'pending', 'skipped', 'failed'].map((f) => (
            <button key={f} onClick={() => setFilter(f)} className="px-3 py-1.5 rounded-lg text-xs font-medium transition-all"
              style={{ background: filter === f ? 'var(--accent)' : 'transparent', color: filter === f ? 'white' : 'var(--muted-fg)' }}>
              {f === 'all' ? 'Todos' : statusConfig[f as keyof typeof statusConfig].label}
            </button>
          ))}
        </div>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-4 gap-4 animate-fade-in-up delay-1">
        {[
          { label: 'Total', value: allLogs.length, color: 'var(--accent-soft-fg)' },
          { label: 'Executados', value: allLogs.filter((l) => l.status === 'executed').length, color: '#4ade80' },
          { label: 'Pendentes', value: allLogs.filter((l) => l.status === 'pending').length, color: '#fbbf24' },
          { label: 'Pulados', value: allLogs.filter((l) => l.status === 'skipped').length, color: '#8888a0' },
        ].map((s) => (
          <div key={s.label} className="glass-card-static p-4 text-center">
            <p className="text-2xl font-bold" style={{ color: s.color }}>{s.value}</p>
            <p className="text-xs mt-1" style={{ color: 'var(--muted-fg)' }}>{s.label}</p>
          </div>
        ))}
      </div>

      {/* Timeline */}
      <div className="glass-card-static overflow-hidden animate-fade-in-up delay-2">
        <div className="p-5 border-b" style={{ borderColor: 'var(--overlay-06)' }}>
          <h2 className="text-base font-semibold text-white">Timeline</h2>
        </div>
        <div className="divide-y" style={{ borderColor: 'var(--overlay-04)' }}>
          {loading ? (
            <div className="p-12 flex justify-center">
              <Spinner />
            </div>
          ) : logs.length === 0 ? (
            <div className="p-12 text-center">
              <p className="text-[var(--muted-fg)]">Nenhuma atividade ainda. Quando o engine agir ou recomendar algo, aparece aqui.</p>
            </div>
          ) : (
            logs.map((log) => {
              const sc = statusConfig[log.status];
              return (
                <div key={log.id} className="flex items-start gap-4 p-5 hover:bg-white/[0.02] transition-colors">
                  {/* Timeline dot */}
                  <div className="mt-1 flex flex-col items-center">
                    <div className="w-8 h-8 rounded-full flex items-center justify-center" style={{ background: sc.bg }}>
                      <Zap size={14} style={{ color: sc.color }} />
                    </div>
                  </div>
                  {/* Content */}
                  <div className="flex-1 min-w-0">
                    <div className="flex items-center gap-2 mb-1">
                      <p className="font-medium text-white text-sm">{log.campaign_name}</p>
                      <span className="inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-[10px] font-medium" style={{ background: sc.bg, color: sc.color }}>
                        {sc.icon} {sc.label}
                      </span>
                    </div>
                    <p className="text-xs" style={{ color: 'var(--muted-fg)' }}>
                      Regra: <span className="text-white">{log.rule_name}</span>
                    </p>
                    <p className="text-xs mt-1" style={{ color: 'var(--muted-fg)' }}>{log.details}</p>
                  </div>
                  {/* Time */}
                  <span className="text-xs whitespace-nowrap" style={{ color: 'var(--muted-fg)' }}>
                    {timeAgo(log.timestamp)}
                  </span>
                </div>
              );
            })
          )}
        </div>
      </div>
    </div>
  );
}