const base64_enc = std.base64.Base64Encoder.init(std.base64.standard_alphabet_chars, '=');
const base64_dec = std.base64.Base64Decoder.init(std.base64.standard_alphabet_chars, '=');

writer: *std.Io.Writer,

const Self = @This();

const max_message_size = 2048;

pub fn init(writer: *std.Io.Writer) !Self {
    return .{
        .writer = writer,
    };
}

pub fn deinit(self: *Self) void {
    self.writer.flush() catch {};
}

pub fn sendRelay(self: *Self, payload: []const u8, dest: [4]u8) !void {
    const payload_len = base64_enc.calcSize(payload.len);

    // Ensure the writer is in a valid state
    std.debug.assert(self.writer.buffer.len - self.writer.end >= payload_len);

    const headers_buf = try self.writer.writableSlice(@sizeOf(SaprusMessage) + @sizeOf(SaprusMessage.Relay));
    const msg: *align(1) SaprusMessage = .init(.relay, headers_buf);
    msg.length = @intCast(payload_len);
    const relay = (try msg.getSaprusTypePayload()).relay;
    relay.dest = dest;

    try base64_enc.encodeWriter(self.writer, payload);
    try msg.networkFromNativeEndian();
    try self.writer.flush();
}

// pub fn sendInitialConnection(
//     self: Self,
//     payload: []const u8,
//     output_bytes: []u8,
//     initial_port: u16,
// ) !*align(1) SaprusMessage {
//     const dest_port = self.randomPort();
//     const msg_bytes = output_bytes[0..try SaprusMessage.calcSize(
//         .connection,
//         base64_enc.calcSize(payload.len),
//     )];
//     const msg: *align(1) SaprusMessage = .init(.connection, msg_bytes);

//     const connection = (try msg.getSaprusTypePayload()).connection;
//     connection.src_port = initial_port;
//     connection.dest_port = dest_port;
//     _ = base64_enc.encode(connection.getPayload(), payload);

//     try broadcastSaprusMessage(msg_bytes, 8888);

//     return msg;
// }

// pub fn connect(self: Self, payload: []const u8) !?SaprusConnection {
//     const initial_port = self.randomPort();

//     var initial_conn_res: ?*align(1) SaprusMessage = null;

//     var sock = try network.Socket.create(.ipv4, .udp);
//     defer sock.close();

//     // Bind to 255.255.255.255:8888
//     const bind_addr = network.EndPoint{
//         .address = network.Address{ .ipv4 = network.Address.IPv4.broadcast },
//         .port = 8888,
//     };

//     // timeout 1s
//     try sock.setReadTimeout(1 * std.time.us_per_s);
//     try sock.bind(bind_addr);

//     var sent_msg_bytes: [max_message_size]u8 align(@alignOf(SaprusMessage)) = undefined;
//     const msg = try self.sendInitialConnection(payload, &sent_msg_bytes, initial_port);

//     var response_buf: [max_message_size]u8 align(@alignOf(SaprusMessage)) = undefined;
//     _ = try sock.receive(&response_buf); // Ignore message that I sent.
//     const len = try sock.receive(&response_buf);

//     initial_conn_res = try .networkBytesAsValue(response_buf[0..len]);

//     // Complete handshake after awaiting response
//     try broadcastSaprusMessage(msg.asBytes(), self.randomPort());

//     if (false) {
//         return initial_conn_res.?;
//     }
//     return null;
// }

const SaprusMessage = @import("message.zig").Message;
const SaprusConnection = @import("Connection.zig");

const std = @import("std");

const network = @import("network");