'use client';

import { CrudToolbar, ManagementTable, Panel, StatCard } from '@chego/ui';
import { FormEvent, useEffect, useMemo, useState } from 'react';
import { fetchWithSession, humanStatus, statusTone } from './api-helpers';

type SupportItem = {
  id: string;
  subject: string;
  description: string;
  status: string;
  createdAt: string;
  updatedAt: string;
};

const emptyValues = { subject: '', description: '', status: 'OPEN' };

export function SupportCrudPanel() {
  const [items, setItems] = useState<SupportItem[]>([]);
  const [values, setValues] = useState<Record<string, string>>(emptyValues);
  const [editingId, setEditingId] = useState<string | null>(null);
  const [mode, setMode] = useState<'idle' | 'create' | 'edit'>('idle');
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState('');

  const load = async () => {
    setLoading(true);
    setError('');
    try {
      setItems(await fetchWithSession('/support-tickets'));
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Falha ao carregar chamados.');
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    void load();
  }, []);

  const metrics = useMemo(() => [
    { label: 'Abertos', value: String(items.filter((item) => item.status === 'OPEN').length), hint: 'triagem ativa', tone: 'amber' as const },
    { label: 'Em andamento', value: String(items.filter((item) => item.status === 'IN_PROGRESS').length), hint: 'suporte respondeu', tone: 'sky' as const },
    { label: 'Resolvidos', value: String(items.filter((item) => item.status === 'RESOLVED').length), hint: 'historico do parceiro', tone: 'emerald' as const },
    { label: 'Total', value: String(items.length), hint: 'tenant isolado', tone: 'rose' as const },
  ], [items]);

  const resetForm = () => {
    setMode('idle');
    setEditingId(null);
    setValues(emptyValues);
    setSaving(false);
  };

  const submit = async (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();
    setSaving(true);
    setError('');
    try {
      await fetchWithSession(mode === 'create' ? '/support-tickets' : `/support-tickets/${editingId}`, {
        method: mode === 'create' ? 'POST' : 'PATCH',
        body: JSON.stringify(values),
      });
      resetForm();
      await load();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Falha ao salvar chamado.');
      setSaving(false);
    }
  };

  const handleEdit = (item: SupportItem) => {
    setMode('edit');
    setEditingId(item.id);
    setValues({
      subject: item.subject,
      description: item.description,
      status: item.status,
    });
  };

  const handleDelete = async (item: SupportItem) => {
    if (!window.confirm(`Excluir chamado ${item.subject}?`)) return;
    await fetchWithSession(`/support-tickets/${item.id}`, { method: 'DELETE' });
    await load();
  };

  return (
    <>
      <section className="grid gap-4 md:grid-cols-4">
        {metrics.map((metric) => <StatCard key={metric.label} {...metric} />)}
      </section>
      <Panel title="Suporte da loja" eyebrow="Chamados reais do parceiro">
        <CrudToolbar filters={['somente loja atual', 'dados remotos', 'atendimento rastreavel']} />
        <div className="mt-4 flex gap-3">
          <button type="button" onClick={() => { setMode('create'); setEditingId(null); setValues(emptyValues); }} className="rounded-full border border-slate-900 bg-slate-900 px-4 py-2 text-xs font-bold uppercase tracking-[0.18em] text-white">Novo chamado</button>
          <button type="button" onClick={() => void load()} className="rounded-full border border-slate-200 bg-white px-4 py-2 text-xs font-bold uppercase tracking-[0.18em] text-slate-700">Recarregar</button>
        </div>
        {error ? <p className="mt-4 rounded-2xl border border-rose-200 bg-rose-50 px-4 py-3 text-sm text-rose-700">{error}</p> : null}
        {mode !== 'idle' ? (
          <form className="mt-5 grid gap-4 rounded-[1.5rem] border border-slate-200 bg-slate-50 p-5 md:grid-cols-2" onSubmit={submit}>
            <label className="grid gap-2 text-sm font-semibold text-slate-700 md:col-span-2">
              <span>Assunto</span>
              <input required value={values.subject} onChange={(event) => setValues((current) => ({ ...current, subject: event.target.value }))} className="h-12 rounded-2xl border border-slate-200 bg-white px-4 outline-none" />
            </label>
            <label className="grid gap-2 text-sm font-semibold text-slate-700 md:col-span-2">
              <span>Descricao</span>
              <input required value={values.description} onChange={(event) => setValues((current) => ({ ...current, description: event.target.value }))} className="h-12 rounded-2xl border border-slate-200 bg-white px-4 outline-none" />
            </label>
            <label className="grid gap-2 text-sm font-semibold text-slate-700">
              <span>Status</span>
              <select value={values.status} onChange={(event) => setValues((current) => ({ ...current, status: event.target.value }))} className="h-12 rounded-2xl border border-slate-200 bg-white px-4 outline-none">
                <option value="OPEN">OPEN</option>
                <option value="IN_PROGRESS">IN_PROGRESS</option>
                <option value="RESOLVED">RESOLVED</option>
                <option value="CLOSED">CLOSED</option>
              </select>
            </label>
            <div className="md:col-span-2 flex gap-3">
              <button type="submit" disabled={saving} className="rounded-full bg-slate-900 px-5 py-3 text-xs font-black uppercase tracking-[0.18em] text-white">{saving ? 'Salvando...' : mode === 'create' ? 'Criar chamado' : 'Salvar ajustes'}</button>
              <button type="button" onClick={resetForm} className="rounded-full border border-slate-200 bg-white px-5 py-3 text-xs font-black uppercase tracking-[0.18em] text-slate-700">Cancelar</button>
            </div>
          </form>
        ) : null}
        <div className="mt-5">
          <ManagementTable
            columns={[
              { key: 'subject', label: 'Assunto' },
              { key: 'createdAt', label: 'Abertura' },
              { key: 'updatedAt', label: 'Ultima interacao' },
              { key: 'status', label: 'Status' },
            ]}
            rows={items.map((item) => ({
              id: item.id,
              cells: {
                subject: <div><p className="font-bold text-slate-900">{item.subject}</p><p className="text-xs text-slate-500">{item.description}</p></div>,
                createdAt: new Date(item.createdAt).toLocaleString('pt-BR'),
                updatedAt: new Date(item.updatedAt).toLocaleString('pt-BR'),
                status: { value: humanStatus(item.status), tone: statusTone(item.status), badge: true },
              },
            }))}
            pageLabel={loading ? 'Carregando chamados...' : `Mostrando ${items.length} chamados desta loja`}
            getRowActions={(row) => {
              const item = items.find((entry) => entry.id === row.id);
              if (!item) return [];
              return [
                { label: 'Editar', onClick: () => handleEdit(item) },
                { label: 'Excluir', onClick: () => void handleDelete(item) },
              ];
            }}
          />
        </div>
      </Panel>
    </>
  );
}