{% extends 'base.html' %}

{% block content %}
    <div class="form-container" style="max-width: 800px; margin: 0 auto;">
        <div class="data-card" style="padding: 2.5rem; background: white; border-radius: 8px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);">
            
            <!-- Banner Requerimiento 6: Plan de mitigación de errores para registro de proveedores -->
            <div id="draft-alert-banner" style="display:none; margin-bottom:1.5rem; background:#eff6ff; border:1px solid #bfdbfe; border-left:4px solid #2563eb; padding:1rem; border-radius:6px;">
                <div style="display:flex; justify-content:space-between; align-items:center;">
                    <div>
                        <strong style="color:#1e40af; font-size:0.9rem;">Borrador Detectado en Almacenamiento Local (Autosave Mitigación)</strong>
                        <p style="margin:0.25rem 0 0 0; color:#1e3a8a; font-size:0.8rem;">Se detectaron datos no guardados de una sesión anterior. ¿Desea restaurarlos?</p>
                    </div>
                    <div style="display:flex; gap:0.5rem;">
                        <button type="button" onclick="restoreVendorDraft()" class="btn-primary" style="padding:0.3rem 0.8rem; font-size:0.8rem; background:#2563eb;">Restaurar</button>
                        <button type="button" onclick="discardVendorDraft()" class="btn-secondary" style="padding:0.3rem 0.8rem; font-size:0.8rem;">Descartar</button>
                    </div>
                </div>
            </div>

            <h2 style="color: var(--efintel-petroleum); margin-bottom: 2rem; border-bottom: 2px solid var(--efintel-light); padding-bottom: 1rem; display: flex; align-items: center; justify-content:space-between;">
                <span style="display:flex; align-items:center; gap:0.5rem;">
                    <i data-lucide="{% if form.instance.pk %}edit-3{% else %}plus-circle{% endif %}"></i> 
                    {% if form.instance.pk %}Editar Proveedor{% else %}Nuevo Proveedor (Registro Seguro){% endif %}
                </span>
                <span class="badge badge-emerald" style="font-size:0.75rem;"><i data-lucide="shield-check" style="width:12px;"></i> Autosave / Anti-Pérdida Activo</span>
            </h2>

            <form method="post" id="vendor-form">
                {% csrf_token %}
                
                <h3 style="margin-bottom: 1rem; color: var(--efintel-dark); font-size: 1rem;">Información General</h3>
                
                <div style="display: grid; grid-template-columns: 1fr 2fr; gap: 1.5rem; margin-bottom: 1.5rem;">
                    <div class="form-group">
                        <label for="{{ form.rut.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">RUT Proveedor</label>
                        <div style="display:flex; gap:0.3rem;">
                            {{ form.rut }}
                            <button type="button" onclick="consultarSIIVendor()" class="btn-outline" style="padding:0.4rem 0.7rem; font-size:0.75rem; white-space:nowrap; background:#f0f9ff; border-color:#7dd3fc; color:#0369a1;" title="Validar y autocompletar con la API del SII">
                                <i data-lucide="search" style="width:12px;"></i> Consultar SII
                            </button>
                        </div>
                        <span id="sii-status-text" style="font-size:0.7rem; color:var(--efintel-gray); margin-top:0.25rem; display:block;"></span>
                        {% if form.rut.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.rut.errors }}</div>{% endif %}
                    </div>

                    <div class="form-group">
                        <label for="{{ form.name.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Razón Social / Nombre</label>
                        {{ form.name }}
                        {% if form.name.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.name.errors }}</div>{% endif %}
                    </div>
                </div>

                <div class="form-group" style="margin-bottom: 2rem;">
                    <label for="{{ form.business_line.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Giro Comercial</label>
                    {{ form.business_line }}
                    {% if form.business_line.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.business_line.errors }}</div>{% endif %}
                </div>

                <h3 style="margin-top: 2.5rem; margin-bottom: 1rem; color: var(--efintel-dark); font-size: 1rem; border-top: 1px solid var(--efintel-light); padding-top: 1.5rem;">Datos Bancarios y Facturación</h3>

                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 1.5rem;">
                    <div class="form-group">
                        <label for="{{ form.bank.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Banco</label>
                        {{ form.bank }}
                        {% if form.bank.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.bank.errors }}</div>{% endif %}
                    </div>

                    <div class="form-group">
                        <label for="{{ form.account_type.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Tipo de Cuenta</label>
                        {{ form.account_type }}
                        {% if form.account_type.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.account_type.errors }}</div>{% endif %}
                    </div>
                </div>
                
                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 1.5rem;">
                    <div class="form-group">
                        <label for="{{ form.account_number.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Número de Cuenta</label>
                        {{ form.account_number }}
                        {% if form.account_number.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.account_number.errors }}</div>{% endif %}
                    </div>

                    <div class="form-group">
                        <label for="{{ form.email.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Correo de Pago/Facturación</label>
                        {{ form.email }}
                        {% if form.email.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.email.errors }}</div>{% endif %}
                    </div>
                </div>

                <div class="form-group" style="margin-bottom: 2rem; width: 50%;">
                    <label for="{{ form.payment_terms.id_for_label }}" style="font-weight: 600; font-size: 0.85rem; color: var(--efintel-dark);">Plazo de Pago (Días)</label>
                    {{ form.payment_terms }}
                    {% if form.payment_terms.errors %}<div style="color: var(--efintel-danger); font-size: 0.75rem; margin-top: 4px;">{{ form.payment_terms.errors }}</div>{% endif %}
                </div>

                <div style="display: flex; gap: 1rem; padding-top: 1.5rem; border-top: 1px solid var(--efintel-light);">
                    <button type="submit" class="btn-primary" style="padding: 0.6rem 2rem; font-size: 0.9rem; background:var(--efintel-blue);">Guardar Proveedor</button>
                    <a href="{% url 'gestion_panel' %}" class="btn-secondary" style="padding: 0.6rem 2rem; font-size: 0.9rem; text-decoration: none;">Cancelar</a>
                </div>
            </form>
        </div>
    </div>
    
    <script>
        document.querySelectorAll('input, select, textarea').forEach(el => {
            el.classList.add('form-control');
        });

        // Requerimiento 6: Autosave en localStorage para mitigación de errores de formulario
        const DRAFT_KEY = 'vendor_form_draft_{{ form.instance.pk|default:"new" }}';
        const vendorForm = document.getElementById('vendor-form');
        const draftBanner = document.getElementById('draft-alert-banner');

        function saveDraft() {
            const formData = {};
            const elements = vendorForm.querySelectorAll('input, select, textarea');
            elements.forEach(el => {
                if (el.name && el.name !== 'csrfmiddlewaretoken') {
                    formData[el.name] = el.value;
                }
            });
            localStorage.setItem(DRAFT_KEY, JSON.stringify(formData));
        }

        function checkForDraft() {
            const saved = localStorage.getItem(DRAFT_KEY);
            if (saved) {
                try {
                    const data = JSON.parse(saved);
                    // Verify if saved data has actual input content
                    const hasValues = Object.values(data).some(v => v && v.trim() !== '');
                    if (hasValues && draftBanner) {
                        draftBanner.style.display = 'block';
                    }
                } catch(e){}
            }
        }

        function restoreVendorDraft() {
            const saved = localStorage.getItem(DRAFT_KEY);
            if (saved) {
                const data = JSON.parse(saved);
                Object.keys(data).forEach(key => {
                    const el = vendorForm.querySelector(`[name="${key}"]`);
                    if (el) el.value = data[key];
                });
                if (draftBanner) draftBanner.style.display = 'none';
            }
        }

        function discardVendorDraft() {
            localStorage.removeItem(DRAFT_KEY);
            if (draftBanner) draftBanner.style.display = 'none';
        }

        vendorForm.querySelectorAll('input, select, textarea').forEach(el => {
            el.addEventListener('input', saveDraft);
            el.addEventListener('change', saveDraft);
        });

        vendorForm.addEventListener('submit', function() {
            localStorage.removeItem(DRAFT_KEY);
        });

        // Check draft on load
        checkForDraft();

        // Requerimiento 4: Consulta API SII en vivo para autocompletar RUT y Razón Social
        function consultarSIIVendor() {
            const rutInput = document.getElementById('{{ form.rut.id_for_label }}');
            const statusText = document.getElementById('sii-status-text');
            if (!rutInput || !rutInput.value.trim()) {
                alert('Por favor ingrese un RUT para consultar en el SII.');
                return;
            }

            statusText.textContent = 'Consultando API SII...';
            statusText.style.color = '#0284c7';

            fetch(`/api/sii/taxpayer-info/?rut=${encodeURIComponent(rutInput.value.trim())}`)
                .then(r => r.json())
                .then(data => {
                    if (data.valid) {
                        rutInput.value = data.rut;
                        const nameInput = document.getElementById('{{ form.name.id_for_label }}');
                        const girosInput = document.getElementById('{{ form.business_line.id_for_label }}');
                        if (nameInput && (!nameInput.value || data.source === 'SII_API')) nameInput.value = data.name;
                        if (girosInput && !girosInput.value) girosInput.value = data.business_line;
                        statusText.textContent = `✓ RUT Validador SII OK (${data.source})`;
                        statusText.style.color = '#16a34a';
                        saveDraft();
                    } else {
                        statusText.textContent = `✗ ${data.error || 'RUT inválido'}`;
                        statusText.style.color = '#dc2626';
                    }
                })
                .catch(err => {
                    statusText.textContent = 'Error al consultar API SII.';
                    statusText.style.color = '#dc2626';
                });
        }
    </script>
{% endblock %}