//! Template Demo - Using predefined document templates
//!
//! Run with: zig build template_demo && ./zig-out/bin/template_demo

const std = @import("std");
const zcatpdf = @import("zcatpdf");

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer _ = gpa.deinit();
    const allocator = gpa.allocator();

    std.debug.print("=== zcatpdf Template Demo ===\n\n", .{});

    // Create invoice using template
    try createInvoiceFromTemplate(allocator);

    // Create letter using template
    try createLetterFromTemplate(allocator);

    std.debug.print("\nTemplate demo completed successfully!\n", .{});
}

fn createInvoiceFromTemplate(allocator: std.mem.Allocator) !void {
    std.debug.print("Creating invoice from template...\n", .{});

    // Get the invoice template
    var tmpl = try zcatpdf.Template.invoiceTemplate(allocator);
    defer tmpl.deinit();

    std.debug.print("  Template: {s}\n", .{tmpl.name});
    std.debug.print("  Page size: {d:.0} x {d:.0} points\n", .{ tmpl.page_width, tmpl.page_height });

    // Create PDF based on template
    var pdf = zcatpdf.Pdf.init(allocator, .{});
    defer pdf.deinit();

    pdf.setTitle("Invoice from Template");

    var page = try pdf.addPageCustom(tmpl.page_width, tmpl.page_height);

    // Use template regions to position content
    if (tmpl.getRegion("header")) |region| {
        std.debug.print("  Header region: ({d:.0}, {d:.0}) {d:.0}x{d:.0}\n", .{ region.x, region.y, region.width, region.height });
        try page.setFont(.helvetica_bold, 20);
        try page.drawText(region.x, region.y, "ACME Corporation");
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y - 15, "123 Business Street");
        try page.drawText(region.x, region.y - 27, "Tech City, TC 12345");
    }

    if (tmpl.getRegion("invoice_info")) |region| {
        std.debug.print("  Invoice info region: ({d:.0}, {d:.0})\n", .{ region.x, region.y });
        try page.setFont(.helvetica_bold, 14);
        try page.drawText(region.x, region.y, "INVOICE #2024-001");
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y - 15, "Date: December 9, 2024");
        try page.drawText(region.x, region.y - 27, "Due: December 23, 2024");
    }

    if (tmpl.getRegion("customer")) |region| {
        std.debug.print("  Customer region: ({d:.0}, {d:.0})\n", .{ region.x, region.y });
        try page.setFont(.helvetica_bold, 12);
        try page.drawText(region.x, region.y, "Bill To:");
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y - 15, "Customer Company Ltd.");
        try page.drawText(region.x, region.y - 27, "456 Client Avenue");
        try page.drawText(region.x, region.y - 39, "Business Town, BT 67890");
    }

    if (tmpl.getRegion("items")) |region| {
        std.debug.print("  Items region: ({d:.0}, {d:.0}) {d:.0}x{d:.0}\n", .{ region.x, region.y, region.width, region.height });

        // Draw table header
        page.setFillColor(zcatpdf.Color.hex(0xE0E0E0));
        try page.fillRect(region.x, region.y + region.height - 25, region.width, 25);

        page.setFillColor(zcatpdf.Color.black);
        try page.setFont(.helvetica_bold, 10);
        try page.drawText(region.x + 5, region.y + region.height - 17, "Description");
        try page.drawText(region.x + 250, region.y + region.height - 17, "Qty");
        try page.drawText(region.x + 320, region.y + region.height - 17, "Price");
        try page.drawText(region.x + 420, region.y + region.height - 17, "Total");

        // Draw table rows
        try page.setFont(.helvetica, 10);
        const items = [_]struct { desc: []const u8, qty: []const u8, price: []const u8, total: []const u8 }{
            .{ .desc = "Web Development Services", .qty = "40", .price = "$75.00", .total = "$3,000.00" },
            .{ .desc = "UI/UX Design", .qty = "20", .price = "$85.00", .total = "$1,700.00" },
            .{ .desc = "Server Hosting (1 year)", .qty = "1", .price = "$500.00", .total = "$500.00" },
        };

        var y_offset: f32 = region.y + region.height - 45;
        for (items) |item| {
            try page.drawText(region.x + 5, y_offset, item.desc);
            try page.drawText(region.x + 250, y_offset, item.qty);
            try page.drawText(region.x + 320, y_offset, item.price);
            try page.drawText(region.x + 420, y_offset, item.total);
            y_offset -= 20;
        }

        // Draw table border
        page.setStrokeColor(zcatpdf.Color.black);
        try page.drawRect(region.x, region.y, region.width, region.height);
    }

    if (tmpl.getRegion("totals")) |region| {
        std.debug.print("  Totals region: ({d:.0}, {d:.0})\n", .{ region.x, region.y });
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y + 60, "Subtotal:");
        try page.drawText(region.x + 100, region.y + 60, "$5,200.00");
        try page.drawText(region.x, region.y + 45, "Tax (10%):");
        try page.drawText(region.x + 100, region.y + 45, "$520.00");

        try page.setLineWidth(1);
        try page.drawLine(region.x, region.y + 35, region.x + region.width, region.y + 35);

        try page.setFont(.helvetica_bold, 12);
        try page.drawText(region.x, region.y + 20, "TOTAL:");
        try page.drawText(region.x + 100, region.y + 20, "$5,720.00");
    }

    if (tmpl.getRegion("footer")) |region| {
        std.debug.print("  Footer region: ({d:.0}, {d:.0})\n", .{ region.x, region.y });
        try page.setFont(.helvetica, 8);
        page.setFillColor(zcatpdf.Color.hex(0x666666));
        try page.drawText(region.x, region.y + 20, "Payment Terms: Net 14 days");
        try page.drawText(region.x, region.y + 8, "Thank you for your business!");
    }

    try pdf.save("template_invoice.pdf");
    std.debug.print("  Saved: template_invoice.pdf\n", .{});
}

fn createLetterFromTemplate(allocator: std.mem.Allocator) !void {
    std.debug.print("\nCreating letter from template...\n", .{});

    // Get the letter template
    var tmpl = try zcatpdf.Template.letterTemplate(allocator);
    defer tmpl.deinit();

    std.debug.print("  Template: {s}\n", .{tmpl.name});

    // Create PDF based on template
    var pdf = zcatpdf.Pdf.init(allocator, .{});
    defer pdf.deinit();

    pdf.setTitle("Letter from Template");

    var page = try pdf.addPageCustom(tmpl.page_width, tmpl.page_height);

    // Sender
    if (tmpl.getRegion("sender")) |region| {
        try page.setFont(.helvetica_bold, 11);
        try page.drawText(region.x, region.y, "John Smith");
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y - 14, "123 Sender Street");
        try page.drawText(region.x, region.y - 26, "City, ST 12345");
        try page.drawText(region.x, region.y - 38, "john@example.com");
    }

    // Date
    if (tmpl.getRegion("date")) |region| {
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y, "December 9, 2024");
    }

    // Recipient
    if (tmpl.getRegion("recipient")) |region| {
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y, "Ms. Jane Doe");
        try page.drawText(region.x, region.y - 14, "456 Recipient Avenue");
        try page.drawText(region.x, region.y - 26, "Town, ST 67890");
    }

    // Subject
    if (tmpl.getRegion("subject")) |region| {
        try page.setFont(.helvetica_bold, 11);
        try page.drawText(region.x, region.y, "Re: Project Proposal Discussion");
    }

    // Body
    if (tmpl.getRegion("body")) |region| {
        try page.setFont(.helvetica, 10);
        const line_height: f32 = 14;
        var y = region.y + region.height;

        try page.drawText(region.x, y, "Dear Ms. Doe,");
        y -= line_height * 2;

        try page.drawText(region.x, y, "I am writing to follow up on our recent conversation regarding the");
        y -= line_height;
        try page.drawText(region.x, y, "proposed collaboration between our organizations. I believe there is");
        y -= line_height;
        try page.drawText(region.x, y, "significant potential for a mutually beneficial partnership.");
        y -= line_height * 2;

        try page.drawText(region.x, y, "As discussed, I have prepared a detailed proposal outlining the scope");
        y -= line_height;
        try page.drawText(region.x, y, "of work, timeline, and expected outcomes. I would be happy to schedule");
        y -= line_height;
        try page.drawText(region.x, y, "a meeting at your earliest convenience to discuss this further.");
        y -= line_height * 2;

        try page.drawText(region.x, y, "Please do not hesitate to contact me if you have any questions or");
        y -= line_height;
        try page.drawText(region.x, y, "require additional information.");
        y -= line_height * 2;

        try page.drawText(region.x, y, "Thank you for your time and consideration.");
    }

    // Signature
    if (tmpl.getRegion("signature")) |region| {
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y + 50, "Sincerely,");
        try page.setFont(.helvetica_bold, 10);
        try page.drawText(region.x, region.y + 20, "John Smith");
        try page.setFont(.helvetica, 10);
        try page.drawText(region.x, region.y + 6, "Senior Consultant");
    }

    try pdf.save("template_letter.pdf");
    std.debug.print("  Saved: template_letter.pdf\n", .{});
}