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use crate::domain::models::{Merchant, OrderRecord};

pub struct BillingService;

impl BillingService {
    pub fn generate_invoice_html(order: &OrderRecord, merchant: &Merchant) -> String {
        let subtotal = order.price_inr;
        let total_tax = order.cgst + order.sgst + order.igst;
        let grand_total = subtotal + total_tax + order.delivery_fee;

        format!(
            r#"<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Invoice - {tx_id}</title>
    <style>
        body {{ font-family: 'Inter', sans-serif; color: #111; margin: 0; padding: 40px; line-height: 1.5; }}
        .invoice-box {{ max-width: 800px; margin: auto; border: 1px solid #eee; padding: 30px; border-radius: 8px; }}
        .header {{ display: flex; justify-content: space-between; margin-bottom: 40px; border-bottom: 2px solid #000; padding-bottom: 20px; }}
        .brand {{ font-size: 24px; font-weight: 800; text-transform: uppercase; letter-spacing: 2px; }}
        .meta {{ text-align: right; }}
        .details {{ display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-bottom: 40px; }}
        .section-title {{ font-size: 10px; font-weight: 800; color: #888; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }}
        table {{ width: 100%; border-collapse: collapse; margin-bottom: 40px; }}
        th {{ text-align: left; background: #fafafa; padding: 12px; font-size: 12px; text-transform: uppercase; border-bottom: 1px solid #eee; }}
        td {{ padding: 12px; font-size: 14px; border-bottom: 1px solid #eee; }}
        .totals {{ margin-left: auto; width: 300px; }}
        .total-row {{ display: flex; justify-content: space-between; padding: 8px 0; }}
        .grand-total {{ font-size: 18px; font-weight: 800; border-top: 2px solid #000; margin-top: 10px; padding-top: 10px; }}
        .footer {{ margin-top: 60px; text-align: center; color: #888; font-size: 12px; }}
    </style>
</head>
<body>
    <div class="invoice-box">
        <div class="header">
            <div class="brand">{brand_name}</div>
            <div class="meta">
                <div style="font-weight: 700;">INVOICE</div>
                <div style="font-size: 12px; color: #666;">#{tx_id}</div>
                <div style="font-size: 12px; color: #666;">Date: {date}</div>
            </div>
        </div>

        <div class="details">
            <div>
                <div class="section-title">Sold By</div>
                <div style="font-weight: 600;">{brand_name}</div>
                <div style="font-size: 13px; color: #444; max-width: 250px;">{merchant_addr}</div>
            </div>
            <div>
                <div class="section-title">Ship To</div>
                <div style="font-weight: 600;">{buyer_name}</div>
                <div style="font-size: 13px; color: #444;">{buyer_email}</div>
                <div style="font-size: 13px; color: #444; max-width: 250px;">{buyer_addr}</div>
            </div>
        </div>

        <table>
            <thead>
                <tr>
                    <th>Item Description</th>
                    <th style="text-align: right;">Amount</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Product Purchase ({link_id})</td>
                    <td style="text-align: right;">₹{subtotal:.2}</td>
                </tr>
            </tbody>
        </table>

        <div class="totals">
            <div class="total-row">
                <span>Subtotal</span>
                <span>₹{subtotal:.2}</span>
            </div>
            <div class="total-row">
                <span>Tax (GST)</span>
                <span>₹{total_tax:.2}</span>
            </div>
            <div class="total-row">
                <span>Shipping</span>
                <span>₹{shipping:.2}</span>
            </div>
            {discount_row}
            <div class="total-row grand-total">
                <span>Grand Total</span>
                <span>₹{total:.2}</span>
            </div>
        </div>

        <div class="footer">
            Generated by Rtix Sovereign Settlement Protocol. Secure Transaction Verified.
        </div>
    </div>
</body>
</html>"#,
            brand_name = merchant.brand_name,
            tx_id = order.transaction_id,
            date = order
                .created_at
                .map(|t| t.format("%d %b %Y").to_string())
                .unwrap_or_else(|| "N/A".to_string()),
            merchant_addr = merchant.business_address.as_deref().unwrap_or("N/A"),
            buyer_name = order.buyer_name,
            buyer_email = order.buyer_email,
            buyer_addr = order.delivery_address.as_deref().unwrap_or("N/A"),
            link_id = order.link_id,
            subtotal = subtotal,
            total_tax = total_tax,
            shipping = order.delivery_fee,
            total = grand_total,
            discount_row = if order.discount_amount > 0.0 {
                format!(
                    r#"<div class="total-row" style="color: #00E59B;"><span>Discount</span><span>-₹{:.2}</span></div>"#,
                    order.discount_amount
                )
            } else {
                String::new()
            }
        )
    }
}