const std = @import("std");

pub fn main(init: std.process.Init) !void {
    const query_string = init.environ_map.get("QUERY_STRING").?;
    var decoded = try init.gpa.alloc(u8, query_string.len);
    @memcpy(decoded, query_string);
    decoded = std.Uri.percentDecodeInPlace(decoded);
    std.mem.replaceScalar(u8, decoded, '+', ' ');

    // Parse the query string.
    var args_map = std.StringHashMap([]const u8).init(init.gpa);
    defer args_map.deinit();
    var args = std.mem.splitScalar(u8, decoded, '&');
    while (args.next()) |arg| {
        const arg_and_value = std.mem.cutScalar(u8, arg, '=').?;
        try args_map.put(arg_and_value[0], arg_and_value[1]);
    }

    const out_path = init.environ_map.get("OUT_PATH").?;
    const out_file = try std.Io.Dir.createFileAbsolute(init.io, out_path, .{ .truncate = false });
    defer out_file.close(init.io);
    const current_size = (try out_file.stat(init.io)).size;
    var buf: [128]u8 = undefined;
    var writer = out_file.writer(init.io, &buf);
    if (current_size == 0) {
        try writer.interface.print("name,email,website,about\r\n", .{});
    } else {
	    try writer.seekTo(current_size);
    }
    try writer.interface.print("{s},{s},{s},{s}\r\n", .{
        args_map.get("name").?,
        args_map.get("email").?,
        args_map.get("website").?,
        args_map.get("about").?,
    });
    try writer.interface.flush();

    // redirect back to the homepage
    try std.Io.File.stdout().writeStreamingAll(init.io, "HTTP/1.0 302 Found\r\nLocation: https://eviltransgenders.club/join\r\n\r\n");
}