cv-site/internal/handlers/cv_contact.go

package handlers

import (
	"fmt"
	"log"
	"net/http"
	"strconv"
	"strings"
	"time"

	c "github.com/juanatsap/cv-site/internal/constants"
	"github.com/juanatsap/cv-site/internal/httputil"
	"github.com/juanatsap/cv-site/internal/email"
)

// ==============================================================================
// CONTACT FORM SUBMISSION HANDLER
// Part of CVHandler - handles POST /api/contact
// ==============================================================================

// ContactFormData represents the contact form submission
type ContactFormData struct {
	Email        string
	Name         string
	Company      string
	Subject      string
	Message      string
	Website      string // Honeypot field - should be empty
	FormLoadedAt string // Timing field - Unix timestamp in milliseconds
	Lang         string
}

// HandleContact handles contact form submissions
func (h *CVHandler) HandleContact(w http.ResponseWriter, r *http.Request) {
	if !httputil.RequirePost(w, r) {
		return
	}

	// Parse form data
	if err := r.ParseForm(); err != nil {
		log.Printf("Error parsing contact form: %v", err)
		h.renderContactError(w, r, "Invalid form data. Please try again.")
		return
	}

	lang := httputil.Lang(r)

	// Extract form data
	formData := &ContactFormData{
		Email:        strings.TrimSpace(r.FormValue("email")),
		Name:         strings.TrimSpace(r.FormValue("name")),
		Company:      strings.TrimSpace(r.FormValue("company")),
		Subject:      strings.TrimSpace(r.FormValue("subject")),
		Message:      strings.TrimSpace(r.FormValue("message")),
		Website:      r.FormValue("website"),        // Honeypot
		FormLoadedAt: r.FormValue("form_loaded_at"), // Timing
		Lang:         lang,
	}

	// Validate form data (includes bot protection)
	if err := validateContactForm(formData, r); err != nil {
		log.Printf("Contact form validation failed from IP %s: %v", getClientIP(r), err)

		// Don't reveal specific errors to potential bots
		if strings.Contains(err.Error(), "spam detected") {
			// Silently succeed for bots
			h.renderContactSuccess(w, r, lang)
			return
		}

		h.renderContactError(w, r, err.Error())
		return
	}

	// Log the contact form submission
	log.Printf("Contact form submission from %s (IP: %s)", formData.Email, getClientIP(r))
	log.Printf("  Name: %s, Company: %s", formData.Name, formData.Company)
	log.Printf("  Subject: %s", formData.Subject)
	log.Printf("  Message length: %d characters", len(formData.Message))

	// Send email via EmailService
	if h.emailService != nil {
		emailData := &email.ContactFormData{
			Email:   formData.Email,
			Name:    formData.Name,
			Company: formData.Company,
			Subject: formData.Subject,
			Message: formData.Message,
			IP:      getClientIP(r),
			Time:    time.Now(),
		}

		if err := h.emailService.SendContactForm(emailData); err != nil {
			log.Printf("ERROR sending contact email: %v", err)
			h.renderContactError(w, r, "Failed to send message. Please try again later.")
			return
		}
		log.Printf("Contact email sent successfully to configured recipient")
	} else {
		log.Printf("WARNING: Email service not configured, skipping email send")
	}

	// Render success response
	h.renderContactSuccess(w, r, lang)
}

// validateContactForm validates the contact form data and performs bot protection
func validateContactForm(data *ContactFormData, r *http.Request) error {
	// Bot protection: Honeypot check - website field should be empty
	if data.Website != "" {
		return fmt.Errorf("spam detected: honeypot field filled")
	}

	// Bot protection: Timing check - form should take at least 2 seconds to fill
	if data.FormLoadedAt != "" {
		loadedAt, err := strconv.ParseInt(data.FormLoadedAt, 10, 64)
		if err == nil {
			now := time.Now().UnixMilli()
			elapsed := now - loadedAt

			// Form filled too quickly (< 2 seconds) - likely a bot
			if elapsed < 2000 {
				return fmt.Errorf("spam detected: form filled too quickly (%dms)", elapsed)
			}

			// Form took too long (> 1 hour) - timestamp expired
			if elapsed > 3600000 {
				return fmt.Errorf("form session expired, please refresh and try again")
			}
		}
	}

	// Required field validation
	if data.Email == "" {
		return fmt.Errorf("email address is required")
	}

	if data.Message == "" {
		return fmt.Errorf("message is required")
	}

	// Email format validation (basic)
	if !strings.Contains(data.Email, "@") || !strings.Contains(data.Email, ".") {
		return fmt.Errorf("invalid email format")
	}

	// Message length validation
	if len(data.Message) < 10 {
		return fmt.Errorf("message is too short (minimum 10 characters)")
	}

	if len(data.Message) > 5000 {
		return fmt.Errorf("message is too long (maximum 5000 characters)")
	}

	return nil
}

// renderContactSuccess renders the contact success partial
func (h *CVHandler) renderContactSuccess(w http.ResponseWriter, r *http.Request, lang string) {
	// Get UI data from cache
	ui := h.dataCache.GetUI(lang)
	if ui == nil {
		log.Printf("Error: UI data not found in cache for language: %s", lang)
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		return
	}

	// Create template data
	data := map[string]interface{}{
		"UI":   ui,
		"Lang": lang,
	}

	// Render the success template
	w.Header().Set(c.HeaderContentType, c.ContentTypeHTML)
	w.WriteHeader(http.StatusOK)

	tmpl, err := h.templates.Render("contact-success")
	if err != nil {
		log.Printf("Error loading contact success template: %v", err)
		// Fallback to simple HTML
		_, _ = w.Write([]byte(`<div class="contact-message contact-success">
			<iconify-icon icon="mdi:check-circle" width="24" height="24"></iconify-icon>
			<div class="contact-message-content">
				<strong>Message Sent!</strong>
				<p>Thank you for your message. I'll get back to you soon.</p>
			</div>
		</div>`))
		return
	}

	if err := tmpl.Execute(w, data); err != nil {
		log.Printf("Error rendering contact success template: %v", err)
		_, _ = w.Write([]byte(`<div class="contact-message contact-success">
			<iconify-icon icon="mdi:check-circle" width="24" height="24"></iconify-icon>
			<div class="contact-message-content">
				<strong>Message Sent!</strong>
				<p>Thank you for your message. I'll get back to you soon.</p>
			</div>
		</div>`))
	}
}

// renderContactError renders the contact error partial
func (h *CVHandler) renderContactError(w http.ResponseWriter, r *http.Request, errorMessage string) {
	lang := httputil.Lang(r)

	// Get UI data from cache
	ui := h.dataCache.GetUI(lang)
	if ui == nil {
		log.Printf("Error: UI data not found in cache for language: %s", lang)
		http.Error(w, "Internal server error", http.StatusInternalServerError)
		return
	}

	// Create template data
	data := map[string]interface{}{
		"UI":           ui,
		"Lang":         lang,
		"ErrorMessage": errorMessage,
	}

	// Render the error template
	// Return 200 OK with error content - HTMX 1.9.x logs console.error for non-2xx responses
	// Validation errors are expected form feedback, not system errors
	w.Header().Set(c.HeaderContentType, c.ContentTypeHTML)
	w.WriteHeader(http.StatusOK)

	tmpl, err := h.templates.Render("contact-error")
	if err != nil {
		log.Printf("Error loading contact error template: %v", err)
		// Fallback to simple HTML
		_, _ = w.Write([]byte(`<div class="contact-message contact-error">
			<iconify-icon icon="mdi:alert-circle" width="24" height="24"></iconify-icon>
			<div class="contact-message-content">
				<strong>Error</strong>
				<p>` + errorMessage + `</p>
			</div>
		</div>`))
		return
	}

	if err := tmpl.Execute(w, data); err != nil {
		log.Printf("Error rendering contact error template: %v", err)
		_, _ = w.Write([]byte(`<div class="contact-message contact-error">
			<iconify-icon icon="mdi:alert-circle" width="24" height="24"></iconify-icon>
			<div class="contact-message-content">
				<strong>Error</strong>
				<p>` + errorMessage + `</p>
			</div>
		</div>`))
	}
}

// Note: getClientIP is defined in contact.go