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					using LMKit.Data;
using LMKit.Extraction;
using LMKit.Model;
using System;
using System.Collections.Generic;

// Load a vision-capable model for invoice processing
var model = LM.LoadFromModelID("qwen3-vl:4b");

// Create the text extraction engine
TextExtraction extractor = new TextExtraction(model);
extractor.Title = "Invoice";
extractor.Description = "Extract structured data from an invoice document";

// Define the invoice fields to extract
extractor.Elements = new List<TextExtractionElement>
{
    new TextExtractionElement("InvoiceNumber", ElementType.String, "The unique invoice identifier"),
    new TextExtractionElement("InvoiceDate", ElementType.Date, "The date the invoice was issued"),
    new TextExtractionElement("DueDate", ElementType.Date, "The payment due date"),
    new TextExtractionElement("VendorName", ElementType.String, "The name of the vendor or supplier"),
    new TextExtractionElement("VendorAddress", ElementType.String, "The vendor's full address"),
    new TextExtractionElement("CustomerName", ElementType.String, "The name of the customer or buyer"),
    new TextExtractionElement("CustomerAddress", ElementType.String, "The customer's full address"),
    new TextExtractionElement("Subtotal", ElementType.Number, "The subtotal amount before tax"),
    new TextExtractionElement("TaxAmount", ElementType.Number, "The total tax amount"),
    new TextExtractionElement("TotalAmount", ElementType.Number, "The total amount due"),
    new TextExtractionElement("Currency", ElementType.String, "The currency code (e.g., USD, EUR)"),
    new TextExtractionElement("PaymentTerms", ElementType.String, "Payment terms or conditions"),
    new TextExtractionElement("LineItems", ElementType.String, "Description of items or services with quantities and prices")
        { IsArray = true }
};

// Load the invoice PDF
string invoicePath = "invoice.pdf";
Attachment invoice = new Attachment(invoicePath);

Console.WriteLine($"Processing invoice: {invoicePath}");
Console.WriteLine($"Pages: {invoice.PageCount}\n");

// Set the invoice content for extraction
extractor.SetContent(invoice);

// Perform structured extraction
TextExtractionResult result = extractor.Parse();

// Display extracted invoice data
Console.WriteLine("--- Extracted Invoice Data ---\n");

foreach (var element in result.Elements)
{
    string value = element.Value?.ToString() ?? "N/A";
    
    if (element.TextExtractionElement.IsArray && element.Value is IEnumerable<object> items)
    {
        Console.WriteLine($"{element.TextExtractionElement.Name}:");
        foreach (var item in items)
        {
            Console.WriteLine($"  - {item}");
        }
    }
    else
    {
        Console.WriteLine($"{element.TextExtractionElement.Name}: {value}");
    }
}

// Access specific fields programmatically
var invoiceNumber = result.GetValue<string>("InvoiceNumber");
var totalAmount = result.GetValue<decimal>("TotalAmount");
var invoiceDate = result.GetValue<DateTime>("InvoiceDate");

Console.WriteLine($"\n--- Summary ---");
Console.WriteLine($"Invoice #{invoiceNumber}");
Console.WriteLine($"Date: {invoiceDate:d}");
Console.WriteLine($"Total: {totalAmount:C}");