import React, { useState, useEffect } from 'react';
import { useApp } from '../../context/AppContext';
import { BarChart3, TrendingUp, Trophy, Target, Award, ArrowUpRight, Pencil } from 'lucide-react';
import { ResponsiveContainer, BarChart, Bar, XAxis, YAxis, Tooltip, CartesianGrid, PieChart, Pie, Cell } from 'recharts';
import { TurkeyHeatMap } from './TurkeyHeatMap';
import { companyStats, monthlyStats, sectorStats, formatTL } from '../../services/analytics';

const PIE_COLORS = ['#2563eb', '#059669', '#7c3aed', '#d97706', '#dc2626', '#0891b2', '#db2777', '#65a30d'];

export const AnalyticsDashboard = () => {
  const { tenders, userProfile } = useApp();

  const cs = companyStats(tenders);
  const monthlyData = monthlyStats(tenders);
  const sektorler = sectorStats(tenders);
  const pieData = sektorler.slice(0, 6).map((s, i) => ({ name: s.sektor, value: s.count, color: PIE_COLORS[i % PIE_COLORS.length] }));
  const pieToplam = pieData.reduce((s, p) => s + p.value, 0);

  // Ciro hedefi — kullanıcı belirler (localStorage)
  const [hedef, setHedef] = useState(() => Number(localStorage.getItem('ihaleist_ciro_hedefi') || 0));
  const [editing, setEditing] = useState(false);
  useEffect(() => { localStorage.setItem('ihaleist_ciro_hedefi', String(hedef)); }, [hedef]);
  const hedefYuzde = hedef > 0 ? Math.min(Math.round((cs.wonTotal / hedef) * 100), 100) : 0;

  return (
    <div className="space-y-6 animate-fade-in">

      {/* Header Banner */}
      <div className="bg-linear-to-r from-slate-900 via-purple-950 to-indigo-900 text-white p-6 rounded-2xl shadow-lg border border-purple-800/40 flex items-center justify-between">
        <div className="flex items-center gap-3">
          <div className="w-12 h-12 rounded-2xl bg-purple-600 text-white flex items-center justify-center font-black shadow-md">
            <BarChart3 className="w-6 h-6" />
          </div>
          <div>
            <h2 className="font-extrabold text-xl">Analitik Dashboard & Fiyat Isı Haritası</h2>
            <p className="text-xs text-purple-200 mt-0.5">{userProfile.company} — kanban süreçlerinizden hesaplanan gerçek kazanma oranı ve il bazlı ihale yoğunluğu.</p>
          </div>
        </div>
      </div>

      {/* KPI Cards & Ciro Target — gerçek (kanban/takip verisinden) */}
      <div className="grid grid-cols-1 md:grid-cols-4 gap-4">

        <div className="bg-white p-5 rounded-2xl border border-slate-200 shadow-xs space-y-2">
          <span className="text-xs font-bold text-slate-500 uppercase tracking-wider block">Katıldığımız İhaleler</span>
          <div className="flex items-center justify-between">
            <span className="text-2xl font-black text-slate-900">{cs.participated} İhale</span>
            <div className="w-8 h-8 rounded-lg bg-blue-50 text-blue-600 flex items-center justify-center">
              <Trophy className="w-4 h-4" />
            </div>
          </div>
          <span className="text-[11px] text-slate-400">Teklif verilen + sonuçlanan</span>
        </div>

        <div className="bg-white p-5 rounded-2xl border border-slate-200 shadow-xs space-y-2">
          <span className="text-xs font-bold text-slate-500 uppercase tracking-wider block">İhale Kazanma Oranımız</span>
          <div className="flex items-center justify-between">
            <span className="text-2xl font-black text-emerald-600">%{cs.winRate}</span>
            {cs.resulted > 0 && (
              <span className="bg-emerald-100 text-emerald-800 font-extrabold text-[10px] px-2 py-0.5 rounded-full flex items-center gap-0.5">
                <ArrowUpRight className="w-3 h-3" /> {cs.won}/{cs.resulted}
              </span>
            )}
          </div>
          <span className="text-[11px] text-slate-400">{cs.resulted > 0 ? `${cs.resulted} sonuçlanan ihaleden` : 'Henüz sonuçlanan ihale yok'}</span>
        </div>

        <div className="bg-white p-5 rounded-2xl border border-slate-200 shadow-xs space-y-2">
          <span className="text-xs font-bold text-slate-500 uppercase tracking-wider block">Toplam Kazanılan Bedel</span>
          <div className="flex items-center justify-between">
            <span className="text-2xl font-black text-indigo-900">{formatTL(cs.wonTotal)}</span>
            <div className="w-8 h-8 rounded-lg bg-indigo-50 text-indigo-600 flex items-center justify-center">
              <Award className="w-4 h-4" />
            </div>
          </div>
          <span className="text-[11px] text-slate-400">{cs.contracts} sözleşme</span>
        </div>

        {/* Ciro Hedefi — kullanıcı belirler */}
        <div className="bg-linear-to-br from-blue-900 to-indigo-900 text-white p-5 rounded-2xl shadow-xs space-y-2">
          <div className="flex justify-between items-center text-xs font-bold">
            <span className="text-blue-200 uppercase tracking-wider flex items-center gap-1">
              <Target className="w-3.5 h-3.5 text-amber-300" /> Ciro Hedefi
            </span>
            <button onClick={() => setEditing((e) => !e)} className="text-blue-200 hover:text-white" title="Hedefi düzenle">
              {hedef > 0 ? <span className="text-amber-300 font-black">%{hedefYuzde}</span> : <Pencil className="w-3.5 h-3.5" />}
            </button>
          </div>
          {editing || hedef === 0 ? (
            <div className="flex items-center gap-1.5 pt-1">
              <input
                type="number"
                value={hedef || ''}
                onChange={(e) => setHedef(Number(e.target.value) || 0)}
                placeholder="Hedef bedel (₺)"
                className="w-full bg-blue-950/60 border border-blue-700 rounded-lg px-2 py-1.5 text-xs text-white placeholder:text-blue-300"
              />
              <button onClick={() => setEditing(false)} className="bg-amber-400 text-blue-950 font-black text-xs px-2.5 py-1.5 rounded-lg">Kaydet</button>
            </div>
          ) : (
            <>
              <span className="text-lg font-black text-white block">{formatTL(cs.wonTotal)} / {formatTL(hedef)}</span>
              <div className="w-full bg-blue-950 rounded-full h-2 overflow-hidden border border-blue-700">
                <div className="bg-amber-400 h-2 rounded-full transition-all" style={{ width: `${hedefYuzde}%` }} />
              </div>
            </>
          )}
        </div>

      </div>

      {/* Recharts Row — gerçek veriden */}
      <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">

        {/* Monthly Revenue Chart */}
        <div className="lg:col-span-2 bg-white p-5 rounded-2xl border border-slate-200 shadow-xs space-y-4">
          <h3 className="font-extrabold text-sm text-slate-900 flex items-center gap-2">
            <TrendingUp className="w-4 h-4 text-blue-600" /> Aylık İhale Kazanım ve Teklif Hacmi (TL)
          </h3>
          <div className="h-64 w-full">
            {monthlyData.length === 0 ? (
              <div className="h-full flex flex-col items-center justify-center text-center border-2 border-dashed border-slate-200 rounded-xl">
                <p className="text-sm font-bold text-slate-400">Henüz teklif/sonuç verisi yok</p>
                <p className="text-xs text-slate-400 mt-1 max-w-xs">Kanban'da ihaleleri "teklif verildi / kazanıldı / kaybedildi" durumuna aldıkça aylık hacim grafiği oluşur.</p>
              </div>
            ) : (
              <ResponsiveContainer width="100%" height="100%">
                <BarChart data={monthlyData}>
                  <CartesianGrid strokeDasharray="3 3" vertical={false} stroke="#f1f5f9" />
                  <XAxis dataKey="month" tick={{ fontSize: 11 }} />
                  <YAxis tick={{ fontSize: 10 }} width={60} tickFormatter={(val) => `₺${Math.round(val / 1000)}k`} />
                  <Tooltip formatter={(value) => [`₺${value.toLocaleString('tr-TR')}`, '']} />
                  <Bar dataKey="katilim" fill="#94a3b8" name="Toplam Verilen Teklif" radius={[4, 4, 0, 0]} />
                  <Bar dataKey="kazanim" fill="#2563eb" name="Kazanılan İhale Hacmi" radius={[4, 4, 0, 0]} />
                </BarChart>
              </ResponsiveContainer>
            )}
          </div>
        </div>

        {/* Sector Distribution Pie */}
        <div className="bg-white p-5 rounded-2xl border border-slate-200 shadow-xs space-y-4">
          <h3 className="font-extrabold text-sm text-slate-900">Sektörel İhale Dağılımı</h3>
          {pieData.length === 0 ? (
            <div className="h-48 flex items-center justify-center text-center border-2 border-dashed border-slate-200 rounded-xl">
              <p className="text-xs text-slate-400 max-w-[180px]">Sektör dağılımı, ihale verisi yüklendikçe hesaplanır.</p>
            </div>
          ) : (
            <>
              <div className="h-48 w-full">
                <ResponsiveContainer width="100%" height="100%">
                  <PieChart>
                    <Pie data={pieData} dataKey="value" nameKey="name" cx="50%" cy="50%" innerRadius={40} outerRadius={70} paddingAngle={4}>
                      {pieData.map((entry, index) => (
                        <Cell key={`cell-${index}`} fill={entry.color} />
                      ))}
                    </Pie>
                    <Tooltip formatter={(value) => [`${value} ihale`, 'Adet']} />
                  </PieChart>
                </ResponsiveContainer>
              </div>
              <div className="space-y-1.5 pt-2">
                {pieData.map((item) => (
                  <div key={item.name} className="flex justify-between items-center text-xs font-semibold">
                    <span className="flex items-center gap-2 min-w-0">
                      <span className="w-2.5 h-2.5 rounded-full shrink-0" style={{ backgroundColor: item.color }}></span>
                      <span className="truncate">{item.name}</span>
                    </span>
                    <span className="font-bold text-slate-900 shrink-0">%{pieToplam ? Math.round((item.value / pieToplam) * 100) : 0}</span>
                  </div>
                ))}
              </div>
            </>
          )}
        </div>

      </div>

      {/* İl bazlı gerçek yoğunluk haritası */}
      <TurkeyHeatMap />

    </div>
  );
};