//! zpdf - PDF generation library for Zig
//!
//! A pure Zig library for creating PDF documents with zero dependencies.
//! Based on fpdf2 (Python) architecture.
//!
//! ## Quick Start
//!
//! ```zig
//! const zpdf = @import("zpdf");
//!
//! pub fn main() !void {
//!     var pdf = zpdf.Pdf.init(allocator, .{});
//!     defer pdf.deinit();
//!
//!     var page = try pdf.addPage(.{});
//!     try page.setFont(.helvetica_bold, 24);
//!     try page.drawText(50, 750, "Hello, PDF!");
//!
//!     try pdf.save("hello.pdf");
//! }
//! ```

const std = @import("std");

// =============================================================================
// Module Re-exports
// =============================================================================

/// Main PDF document facade
pub const pdf = @import("pdf.zig");
pub const Pdf = pdf.Pdf;

/// Page representation
pub const page = @import("page.zig");
pub const Page = page.Page;
pub const Align = page.Align;
pub const Border = page.Border;
pub const CellPosition = page.Page.CellPosition;

/// Content stream (low-level PDF operators)
pub const content_stream = @import("content_stream.zig");
pub const ContentStream = content_stream.ContentStream;
pub const RenderStyle = content_stream.RenderStyle;
pub const LineCap = content_stream.LineCap;
pub const LineJoin = content_stream.LineJoin;
pub const TextRenderMode = content_stream.TextRenderMode;

/// Graphics (colors, etc.)
pub const graphics = @import("graphics/mod.zig");
pub const Color = graphics.Color;

/// Fonts
pub const fonts = @import("fonts/mod.zig");
pub const Font = fonts.Font;
pub const FontFamily = fonts.FontFamily;
pub const FontState = fonts.FontState;

/// Objects (base types, page sizes, units)
pub const objects = @import("objects/mod.zig");
pub const PageSize = objects.PageSize;
pub const Orientation = objects.Orientation;
pub const Unit = objects.Unit;

/// Output (PDF generation)
pub const output = @import("output/mod.zig");
pub const OutputProducer = output.OutputProducer;

/// Images (JPEG, PNG)
pub const images = @import("images/mod.zig");
pub const ImageInfo = images.ImageInfo;
pub const ImageFormat = images.ImageFormat;

// =============================================================================
// Backwards Compatibility - Old API (Document)
// =============================================================================

/// Legacy Document type (use Pdf instead for new code).
/// Provided for backwards compatibility with existing code.
pub const Document = struct {
    inner: Pdf,

    const Self = @This();

    /// Creates a new empty PDF document.
    pub fn init(allocator: std.mem.Allocator) Self {
        return .{
            .inner = Pdf.init(allocator, .{}),
        };
    }

    /// Frees all resources.
    pub fn deinit(self: *Self) void {
        self.inner.deinit();
    }

    /// Adds a new page with a standard size.
    pub fn addPage(self: *Self, size: PageSize) !*Page {
        return try self.inner.addPage(.{ .size = size });
    }

    /// Adds a new page with custom dimensions (in points).
    pub fn addPageCustom(self: *Self, width: f32, height: f32) !*Page {
        return try self.inner.addPageCustom(width, height);
    }

    /// Renders the document to a byte buffer.
    pub fn render(self: *Self, allocator: std.mem.Allocator) ![]u8 {
        _ = allocator; // Use inner allocator
        return try self.inner.render();
    }

    /// Saves the document to a file.
    pub fn saveToFile(self: *Self, path: []const u8) !void {
        return try self.inner.save(path);
    }
};

// =============================================================================
// Tests
// =============================================================================

test "zpdf re-exports" {
    // Test that all types are accessible
    _ = Pdf;
    _ = Page;
    _ = ContentStream;
    _ = Color;
    _ = Font;
    _ = PageSize;
    _ = Document;
}

test "Document backwards compatibility" {
    const allocator = std.testing.allocator;

    var doc = Document.init(allocator);
    defer doc.deinit();

    var pg = try doc.addPage(.a4);
    try pg.setFont(.helvetica_bold, 24);
    try pg.drawText(50, 750, "Hello");
    try pg.drawLine(50, 740, 200, 740);

    const data = try doc.render(allocator);
    defer allocator.free(data);

    try std.testing.expect(std.mem.startsWith(u8, data, "%PDF-1.4"));
}

test "new Pdf API" {
    const allocator = std.testing.allocator;

    var zpdf_doc = Pdf.init(allocator, .{
        .page_size = .a4,
        .orientation = .portrait,
    });
    defer zpdf_doc.deinit();

    zpdf_doc.setTitle("Test Document");
    zpdf_doc.setAuthor("zpdf");

    var pg = try zpdf_doc.addPage(.{});
    try pg.setFont(.helvetica_bold, 24);
    pg.setFillColor(Color.blue);
    try pg.drawText(50, 750, "Hello zpdf!");

    pg.setStrokeColor(Color.red);
    try pg.setLineWidth(2);
    try pg.drawLine(50, 740, 200, 740);

    pg.setFillColor(Color.light_gray);
    try pg.fillRect(50, 600, 150, 100);

    const data = try zpdf_doc.output();
    defer allocator.free(data);

    try std.testing.expect(std.mem.startsWith(u8, data, "%PDF-1.4"));
    try std.testing.expect(std.mem.indexOf(u8, data, "/Title (Test Document)") != null);
}

test "Color types" {
    const red = Color.rgb(255, 0, 0);
    const floats = red.toRgbFloats();
    try std.testing.expectApproxEqAbs(@as(f32, 1.0), floats.r, 0.01);
    try std.testing.expectApproxEqAbs(@as(f32, 0.0), floats.g, 0.01);
    try std.testing.expectApproxEqAbs(@as(f32, 0.0), floats.b, 0.01);

    const hex_color = Color.hex(0xFF8000);
    try std.testing.expectEqual(@as(u8, 255), hex_color.rgb_val.r);
    try std.testing.expectEqual(@as(u8, 128), hex_color.rgb_val.g);
    try std.testing.expectEqual(@as(u8, 0), hex_color.rgb_val.b);
}

test "Font metrics" {
    const font = Font.helvetica;
    try std.testing.expectEqualStrings("Helvetica", font.pdfName());

    const width = font.stringWidth("Hello", 12.0);
    try std.testing.expect(width > 0);
}

test "ContentStream operators" {
    const allocator = std.testing.allocator;

    var cs = ContentStream.init(allocator);
    defer cs.deinit();

    try cs.saveState();
    try cs.setLineWidth(2.0);
    try cs.setStrokeColorRgb(1.0, 0.0, 0.0);
    try cs.moveTo(100, 200);
    try cs.lineTo(300, 200);
    try cs.stroke();
    try cs.restoreState();

    const content = cs.getContent();
    try std.testing.expect(std.mem.indexOf(u8, content, "q\n") != null);
    try std.testing.expect(std.mem.indexOf(u8, content, "Q\n") != null);
    try std.testing.expect(std.mem.indexOf(u8, content, "1.000 0.000 0.000 RG") != null);
}

// Import all module tests
comptime {
    _ = @import("content_stream.zig");
    _ = @import("page.zig");
    _ = @import("pdf.zig");
    _ = @import("graphics/color.zig");
    _ = @import("fonts/type1.zig");
    _ = @import("objects/base.zig");
    _ = @import("output/producer.zig");
    _ = @import("images/mod.zig");
    _ = @import("images/image_info.zig");
    _ = @import("images/jpeg.zig");
    _ = @import("images/png.zig");
}