import { NextRequest, NextResponse } from 'next/server';
import { createClient } from '@supabase/supabase-js';
import { Resend } from 'resend';

// Initialize Supabase client with anon key (optional - only if credentials are provided)

// Email template utility (bundled)
// Metadata interface matching the frontend
interface Metadata {
    browser: {
      userAgent: string;
      language: string;
      platform: string;
      viewport: {
        width: number;
        height: number;
      };
    };
    context: {
      url: string;
      timestamp: string;
      referrer: string;
      location?: {
        city: string;
        country: string;
        timezone: string;
        continent: string;
      };
    };
  }
  
  // Email template utility (bundled)
  interface EmailTemplateData {
    content: string;
    email?: string;
    emoji?: string;
    metadata?: Metadata;
  }

function generateEmailTemplate(data: EmailTemplateData): string {
  const { content, email, emoji, metadata } = data;
  
  return `
    <div style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; max-width: 600px; margin: 0 auto; padding: 20px;">
      <h2 style="color: #374151; margin-bottom: 24px;">New Feedback Received</h2>
      
      <div style="background: #f8fafc; padding: 16px; border-radius: 8px; margin-bottom: 20px;">
        <div style="font-size: 18px; font-weight: 600; margin-bottom: 8px;">
          ${emoji || '💬'} ${content}
        </div>
        ${email ? `<div style="color: #64748b; font-size: 14px;">From: ${email}</div>` : ''}
      </div>

      <div style="border-top: 1px solid #e2e8f0; padding-top: 16px;">
        <h3 style="color: #374151; font-size: 14px; margin-bottom: 12px; text-transform: uppercase; letter-spacing: 0.05em;">Context</h3>
        
        <div style="display: grid; gap: 8px; font-size: 14px;">
          <div>
            <span style="color: #6b7280;">🕒 </span>
            <span>${new Date().toLocaleString()}</span>
          </div>
          
          <div>
            <span style="color: #6b7280;">🔗 </span>
            <a href="${metadata?.context?.url || 'Unknown'}" style="color: #374151; text-decoration: none;">${metadata?.context?.url || 'Unknown'}</a>
          </div>

          ${metadata?.context?.location ? `
          <div>
            <span style="color: #6b7280;">🌍 </span>
            <span>${metadata.context.location.city}, ${metadata.context.location.country} (${metadata.context.location.timezone})</span>
          </div>
          ` : ''}

          ${metadata?.browser?.platform ? `
          <div>
            <span style="color: #6b7280;">🖥️ </span>
            <span>${metadata.browser.platform}</span>
          </div>
          ` : ''}

          ${metadata?.browser?.language ? `
          <div>
            <span style="color: #6b7280;">🌐 </span>
            <span>${metadata.browser.language}</span>
          </div>
          ` : ''}

          ${metadata?.browser?.viewport ? `
          <div>
            <span style="color: #6b7280;">📱 </span>
            <span>${metadata.browser.viewport.width}×${metadata.browser.viewport.height}</span>
          </div>
          ` : ''}
        </div>
      </div>

      <div style="margin-top: 24px; padding-top: 16px; border-top: 1px solid #e2e8f0; font-size: 12px; color: #9ca3af; text-align: center;">
        Powered by <a href="https://freedback.dev" style="color: #374151; text-decoration: none;">Freedback</a>
      </div>
    </div>
  `;
}

const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY;
const supabase = (supabaseUrl && supabaseAnonKey) ? createClient(supabaseUrl, supabaseAnonKey) : null;

// Initialize Resend (optional - only if API key is provided)
const resendApiKey = process.env.RESEND_API_KEY;
const notificationEmail = process.env.FREEDBACK_EMAIL_NOTIFICATION;
const fromEmail = process.env.FREEDBACK_EMAIL_FROM;
const resend = resendApiKey ? new Resend(resendApiKey) : null;

export async function POST(request: NextRequest) {
  try {
    const { content, email, emoji, metadata } = await request.json();

    if (!content || content.trim().length === 0) {
      return NextResponse.json({ error: 'Content is required' }, { status: 400 });
    }

    // Insert feedback into Supabase (if configured)
    if (supabase) {
      const { error } = await supabase
        .from('freedback')
        .insert([
          {
            content: content.trim(),
            email: email || null,
            emoji: emoji || null,
            metadata: metadata || null,
          },
        ]);

      if (error) {
        console.error('Supabase error:', error);
        return NextResponse.json({ error: 'Failed to save feedback' }, { status: 500 });
      }
    }

    // Send email notification if Resend is configured
    if (resend && notificationEmail && fromEmail) {
      try {
        await resend.emails.send({
          from: fromEmail,
          to: notificationEmail,
          subject: `New Feedback Received ${emoji || ''}`,
          html: generateEmailTemplate({ content, email, emoji, metadata }),
        });
      } catch (emailError) {
        console.error('Email notification failed:', emailError);
        // Don't fail the request if email fails
      }
    }

    // For email-only mode, ensure at least one action was taken
    if (!supabase && (!resend || !notificationEmail || !fromEmail)) {
      console.log('Feedback received (console-only mode):', { content, email, emoji, metadata });
    }

    return NextResponse.json({ success: true });
  } catch (error) {
    console.error('API error:', error);
    return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
  }
}