import { useEffect, useMemo, useState } from 'react';
import { DataPanel } from './DataPanel';
import {
  approveTemplateByAdmin,
  deleteTemplate,
  listTemplates,
  rejectTemplateByAdmin,
  saveTemplate,
} from '../services/templateService';

const fieldStyle = {
  width: '100%',
  border: '1px solid var(--color-border)',
  borderRadius: '14px',
  padding: '0.75rem 0.85rem',
  background: '#fff',
  color: 'var(--color-text)',
  fontWeight: 600,
};

const statusMeta = {
  approved: {
    label: 'Aprovado pela Meta',
    background: 'rgba(34, 197, 94, 0.12)',
    color: '#15803d',
  },
  meta_review: {
    label: 'Em análise pela Meta',
    background: 'rgba(229, 162, 42, 0.16)',
    color: '#8a5a00',
  },
  admin_review: {
    label: 'Aguardando aprovação do admin',
    background: 'rgba(0, 49, 80, 0.1)',
    color: 'var(--color-primary)',
  },
  rejected: {
    label: 'Reprovado pelo admin',
    background: 'rgba(181, 31, 31, 0.1)',
    color: 'var(--color-secondary)',
  },
};

const templateCategories = [
  { id: 'UTILITY', label: 'UTILITY', detail: 'Confirmações, lembretes e atualizações', cost: 'Menor custo' },
  { id: 'MARKETING', label: 'MARKETING', detail: 'Promoções, ofertas e engajamento', cost: 'Maior custo' },
  { id: 'AUTHENTICATION', label: 'AUTHENTICATION', detail: 'OTP e códigos de verificação', cost: 'Menor custo' },
];

function getTemplateStatus(template) {
  return statusMeta[template.status] || statusMeta.approved;
}

function getRemainingMetaText(template) {
  if (template.status !== 'meta_review' || !template.meta_submitted_at) return '';
  const submittedAt = new Date(template.meta_submitted_at).getTime();
  const approvedAt = submittedAt + 15 * 60 * 1000;
  const remainingMs = approvedAt - Date.now();
  if (remainingMs <= 0) return 'Aprovação disponível ao atualizar.';
  const minutes = Math.ceil(remainingMs / 60000);
  return `Aprovação em aproximadamente ${minutes} min.`;
}

function renderTemplatePreview(content) {
  return String(content || 'Digite a mensagem do template...')
    .replace(/\{nome\}/gi, 'Ana Paula')
    .replace(/\{cliente\}/gi, 'Ana Paula')
    .replace(/\{data\}/gi, '26/05/2026')
    .replace(/\{link\}/gi, 'https://sothis.com.br/rh')
    .replace(/\{variavel\}/gi, 'informação personalizada')
    .replace(/\{variável\}/gi, 'informação personalizada');
}

export function TemplateManagementPanel({
  areas = [],
  mode = 'admin',
  managedAreaNames = [],
  isMobile = false,
}) {
  const [templates, setTemplates] = useState([]);
  const [selectedArea, setSelectedArea] = useState('all');
  const [form, setForm] = useState({ name: '', content: '', areaId: '', category: 'UTILITY' });
  const [statusMessage, setStatusMessage] = useState('');
  const [isLoading, setIsLoading] = useState(true);

  const isAdmin = mode === 'admin';
  const visibleAreas = isAdmin
    ? areas
    : areas.filter((area) => managedAreaNames.includes(area.nome));

  const filteredTemplates = useMemo(() => {
    return templates.filter((template) => {
      const areaMatches = selectedArea === 'all' || String(template.area_id || '') === selectedArea;
      const supervisorAreaMatches =
        isAdmin ||
        !template.area_nome ||
        managedAreaNames.includes(template.area_nome);
      return areaMatches && supervisorAreaMatches;
    });
  }, [templates, selectedArea, isAdmin, managedAreaNames]);

  async function loadTemplates() {
    setIsLoading(true);
    try {
      const data = await listTemplates();
      setTemplates(Array.isArray(data) ? data : []);
      setStatusMessage('');
    } catch (error) {
      setStatusMessage(error.message);
    } finally {
      setIsLoading(false);
    }
  }

  useEffect(() => {
    loadTemplates();
  }, []);

  async function submitTemplate(event) {
    event.preventDefault();
    const name = form.name.trim();
    const content = form.content.trim();
    if (!name || !content) return;

    try {
      await saveTemplate({
        name,
        content,
        category: form.category,
        areaId: Number(form.areaId) || null,
        requestedByRole: isAdmin ? 'admin' : 'supervisor',
      });
      setForm({ name: '', content: '', areaId: '', category: 'UTILITY' });
      setStatusMessage(
        isAdmin
          ? 'Template enviado para aprovação.'
          : 'Template enviado para aprovação do admin.',
      );
      await loadTemplates();
    } catch (error) {
      setStatusMessage(error.message);
    }
  }

  async function approveTemplate(templateId) {
    try {
      await approveTemplateByAdmin(templateId);
      setStatusMessage('Template aprovado pelo admin e enviado para análise da Meta.');
      await loadTemplates();
    } catch (error) {
      setStatusMessage(error.message);
    }
  }

  async function rejectTemplate(templateId) {
    try {
      await rejectTemplateByAdmin(templateId);
      setStatusMessage('Template reprovado pelo admin.');
      await loadTemplates();
    } catch (error) {
      setStatusMessage(error.message);
    }
  }

  async function removeTemplate(templateId) {
    try {
      await deleteTemplate(templateId);
      setStatusMessage('Template excluído.');
      await loadTemplates();
    } catch (error) {
      setStatusMessage(error.message);
    }
  }

  return (
    <section style={{ display: 'grid', gap: '1rem' }}>
      <div style={{ display: 'flex', justifyContent: 'flex-end' }}>
        <label style={{ display: 'grid', gap: '0.35rem', width: isMobile ? '100%' : 280 }}>
          <span style={{ fontWeight: 800 }}>Filtrar por especialidade</span>
          <select value={selectedArea} onChange={(event) => setSelectedArea(event.target.value)} style={fieldStyle}>
            <option value="all">Todas as especialidades</option>
            {visibleAreas.map((area) => (
              <option key={area.id} value={area.id}>
                {area.nome}
              </option>
            ))}
          </select>
        </label>
      </div>

      <DataPanel
        title={isAdmin ? 'Templates WhatsApp' : 'Solicitar template'}
        description={
          isAdmin
            ? 'Crie templates e aprove solicitações de supervisores antes do envio para a Meta.'
            : 'Templates enviados por supervisor passam primeiro pela aprovação do admin.'
        }
      >
        <form onSubmit={submitTemplate} style={{ display: 'grid', gridTemplateColumns: isMobile ? '1fr' : 'minmax(0, 1fr) minmax(300px, 0.55fr)', gap: '1rem', alignItems: 'start' }}>
          <div style={{ display: 'grid', gap: '0.85rem' }}>
            <div style={{ display: 'grid', gridTemplateColumns: isMobile ? '1fr' : 'minmax(0, 0.8fr) minmax(0, 0.7fr) minmax(220px, 0.55fr)', gap: '0.85rem' }}>
              <input
                type="text"
                value={form.name}
                onChange={(event) => setForm((current) => ({ ...current, name: event.target.value }))}
                placeholder="Identificador do template"
                style={fieldStyle}
              />
              <select
                value={form.areaId}
                onChange={(event) => setForm((current) => ({ ...current, areaId: event.target.value }))}
                style={fieldStyle}
              >
                <option value="">Sem especialidade</option>
                {visibleAreas.map((area) => (
                  <option key={area.id} value={area.id}>
                    {area.nome}
                  </option>
                ))}
              </select>
              <select
                value={form.category}
                onChange={(event) => setForm((current) => ({ ...current, category: event.target.value }))}
                style={fieldStyle}
              >
                {templateCategories.map((category) => (
                  <option key={category.id} value={category.id}>
                    {category.label} - {category.cost}
                  </option>
                ))}
              </select>
            </div>

            <div style={{ display: 'flex', gap: '0.45rem', flexWrap: 'wrap' }}>
              {['{nome}', '{data}', '{link}', '{variavel}'].map((variable) => (
                <button
                  key={variable}
                  type="button"
                  onClick={() => setForm((current) => ({ ...current, content: `${current.content}${current.content ? ' ' : ''}${variable}` }))}
                  style={{
                    border: '1px solid var(--color-border)',
                    borderRadius: 999,
                    padding: '0.45rem 0.7rem',
                    background: '#fff',
                    color: 'var(--color-primary)',
                    fontWeight: 800,
                  }}
                >
                  Adicionar {variable}
                </button>
              ))}
            </div>

            <textarea
              value={form.content}
              onChange={(event) => setForm((current) => ({ ...current, content: event.target.value }))}
              placeholder="Mensagem do template. Ex: Olá, {nome}. Podemos seguir com seu atendimento por aqui?"
              rows={6}
              style={{ ...fieldStyle, resize: 'vertical', lineHeight: 1.5 }}
            />

            <button
              type="submit"
              style={{
                border: 'none',
                borderRadius: 16,
                padding: '0.9rem 1rem',
                background: 'var(--color-primary)',
                color: '#fff',
                fontWeight: 800,
                width: 'fit-content',
              }}
            >
              {isAdmin ? 'Enviar para aprovação' : 'Enviar para admin'}
            </button>
          </div>

          <aside
            aria-label="Preview do template no WhatsApp"
            style={{
              borderRadius: 22,
              padding: '1rem',
              background: 'linear-gradient(180deg, #e8f3ee, #dcefe8)',
              border: '1px solid rgba(0, 49, 80, 0.08)',
              minHeight: 260,
              display: 'grid',
              alignContent: 'end',
            }}
          >
            <div style={{ display: 'grid', gap: '0.45rem' }}>
              <span style={{ color: 'var(--color-text-soft)', fontWeight: 800, fontSize: '0.82rem' }}>
                Preview WhatsApp
              </span>
              <div
                style={{
                  justifySelf: 'end',
                  maxWidth: '92%',
                  borderRadius: '16px 16px 4px 16px',
                  padding: '0.85rem 0.95rem',
                  background: '#d9fdd3',
                  color: '#1f2c33',
                  boxShadow: '0 6px 18px rgba(0, 49, 80, 0.08)',
                  whiteSpace: 'pre-wrap',
                  lineHeight: 1.45,
                  fontSize: '0.94rem',
                }}
              >
                {renderTemplatePreview(form.content)}
                <span
                  style={{
                    display: 'block',
                    marginTop: '0.5rem',
                    textAlign: 'right',
                    color: 'rgba(31, 44, 51, 0.58)',
                    fontSize: '0.72rem',
                    fontWeight: 700,
                  }}
                >
                  10:42
                </span>
              </div>
            </div>
          </aside>
        </form>

        {statusMessage ? (
          <div style={{ marginTop: '0.85rem', color: 'var(--color-primary)', fontWeight: 800 }}>
            {statusMessage}
          </div>
        ) : null}
      </DataPanel>

      <DataPanel title="Lista de templates" description={isLoading ? 'Carregando templates...' : 'Status do fluxo de aprovação.'}>
        <div style={{ display: 'grid', gap: '0.75rem', maxHeight: 520, overflowY: 'auto', paddingRight: '0.2rem' }}>
          {filteredTemplates.map((template) => {
            const status = getTemplateStatus(template);
            const remainingMetaText = getRemainingMetaText(template);

            return (
              <article
                key={template.id}
                style={{
                  border: '1px solid var(--color-border)',
                  borderRadius: 18,
                  padding: '1rem',
                  background: '#fff',
                  display: 'grid',
                  gap: '0.65rem',
                }}
              >
                <div style={{ display: 'flex', justifyContent: 'space-between', gap: '1rem', flexWrap: 'wrap' }}>
                  <div>
                    <strong style={{ display: 'block' }}>{template.name}</strong>
                    <span style={{ color: 'var(--color-text-soft)', fontSize: '0.9rem' }}>
                      {template.area_nome || 'Sem especialidade'} · {template.category || 'UTILITY'}
                    </span>
                  </div>
                  <span
                    style={{
                      width: 'fit-content',
                      borderRadius: 999,
                      padding: '0.3rem 0.65rem',
                      background: status.background,
                      color: status.color,
                      fontWeight: 800,
                      fontSize: '0.82rem',
                    }}
                  >
                    {status.label}
                  </span>
                </div>

                <p style={{ margin: 0, color: 'var(--color-text-soft)', lineHeight: 1.5 }}>
                  {template.content}
                </p>

                {remainingMetaText ? (
                  <span style={{ color: '#8a5a00', fontWeight: 700 }}>{remainingMetaText}</span>
                ) : null}

                {isAdmin ? (
                  <div style={{ display: 'flex', gap: '0.55rem', flexWrap: 'wrap' }}>
                    {template.status === 'admin_review' ? (
                      <>
                        <button
                          type="button"
                          onClick={() => approveTemplate(template.id)}
                          style={{
                            border: 'none',
                            borderRadius: 14,
                            padding: '0.75rem 0.9rem',
                            background: 'var(--color-primary)',
                            color: '#fff',
                            fontWeight: 800,
                          }}
                        >
                          Aprovar e enviar para Meta
                        </button>
                        <button
                          type="button"
                          onClick={() => rejectTemplate(template.id)}
                          style={{
                            border: 'none',
                            borderRadius: 14,
                            padding: '0.75rem 0.9rem',
                            background: 'rgba(181, 31, 31, 0.1)',
                            color: 'var(--color-secondary)',
                            fontWeight: 800,
                          }}
                        >
                          Reprovar
                        </button>
                      </>
                    ) : null}
                    <button
                      type="button"
                      onClick={() => removeTemplate(template.id)}
                      style={{
                        border: '1px solid rgba(181, 31, 31, 0.22)',
                        borderRadius: 14,
                        padding: '0.75rem 0.9rem',
                        background: '#fff',
                        color: 'var(--color-secondary)',
                        fontWeight: 800,
                      }}
                    >
                      Excluir
                    </button>
                  </div>
                ) : null}
              </article>
            );
          })}

          {!filteredTemplates.length ? (
            <span style={{ color: 'var(--color-text-soft)', fontWeight: 700 }}>
              Nenhum template encontrado para o filtro atual.
            </span>
          ) : null}
        </div>
      </DataPanel>
    </section>
  );
}