/**
 * Amazon Invoice Downloader
 * 
 * Instructions:
 * 1. Go to your Amazon orders page.
 * 2. Open browser console (F12).
 * 3. Paste this script and press Enter.
 */

async function downloadAmazonInvoices() {
    const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms));
    
    // Helper to find all "Invoice" dropdown buttons
    function getInvoiceButtons() {
        const triggers = Array.from(document.querySelectorAll("a, span, button")).filter(el => {
            const text = el.textContent || "";
            // Look for exact "Rechnung" text
            const isMatch = text.trim() === "Rechnung";
            const isClickable = el.tagName === "A" || el.tagName === "BUTTON" || el.closest("a") || el.classList.contains("a-declarative");
            return isMatch && isClickable;
        });

        // Remove duplicates: if we found both a link and the span inside it, 
        // only keep the outer-most one to avoid clicking the same thing twice.
        return triggers.filter(el => {
            let parent = el.parentElement;
            while (parent) {
                if (triggers.includes(parent)) return false;
                parent = parent.parentElement;
            }
            return true;
        });
    }

    const buttons = getInvoiceButtons();
    console.log(`Found ${buttons.length} orders with invoices.`);

    for (let i = 0; i < buttons.length; i++) {
        console.log(`Processing order ${i + 1}/${buttons.length}...`);
        const btn = buttons[i];
        
        // Scroll into view to ensure clickability
        btn.scrollIntoView({ block: "center" });
        await sleep(200);
        btn.click();
        
        // Wait for the AJAX popover to load
        await sleep(2000);

        // Find links in the currently visible popover
        const visiblePopover = Array.from(document.querySelectorAll(".a-popover")).find(p => p.style.visibility !== "hidden" && p.style.display !== "none");
        const container = visiblePopover || document;
        
        const popoverLinks = Array.from(container.querySelectorAll("a")).filter(el => {
            const text = el.textContent.trim().toLowerCase();
            const href = el.href.toLowerCase();
            
            // Only include actual invoice downloads
            // Matches "rechnung" (including "Rechnung 1") or URLs with "invoice.pdf"
            // Excludes "Rechnung anfordern" (Request) and "Bestellübersicht" (Summary)
            const isInvoiceText = text.startsWith("rechnung") || text.startsWith("invoice");
            const isInvoiceUrl = href.includes("invoice.pdf");
            const isBlacklisted = text.includes("anfordern") || text.includes("request") || text.includes("summary") || text.includes("übersicht");

            return (isInvoiceText || isInvoiceUrl) && !isBlacklisted;
        });

        // Deduplicate links by URL to avoid downloading the same file twice
        const uniqueLinks = [];
        const seenUrls = new Set();
        for (const link of popoverLinks) {
            if (!seenUrls.has(link.href)) {
                seenUrls.add(link.href);
                uniqueLinks.push(link);
            }
        }

        console.log(`Found ${uniqueLinks.length} actual invoices in popover.`);

        for (const link of uniqueLinks) {
            console.log(`Downloading: ${link.textContent.trim()}`, link.href);
            
            // Create a temporary link to force proper browser behavior
            // and ensure we don't navigate the main window away.
            const a = document.createElement("a");
            a.href = link.href;
            a.target = "_blank"; // Open in new tab/background
            a.download = "";     // Hint to download instead of opening
            document.body.appendChild(a);
            a.click();
            
            // Clean up
            setTimeout(() => document.body.removeChild(a), 100);
            
            await sleep(500);
        }

        // Close the popover by clicking the close button if it exists, or clicking the button again
        const closeButton = document.querySelector(".a-popover-header .a-button-close, .a-button-close");
        if (closeButton) {
            closeButton.click();
            await sleep(200);
        }
    }
    
    console.log("Finished processing all invoices.");
}

downloadAmazonInvoices();