const std = @import("std");
const Linenoise = @import("linenoise").Linenoise;

fn clear() !void {
    const stdout = std.io.getStdOut().writer();
    try stdout.print("\u{001b}[H\u{001b}[J", .{});
}
const Pipe = packed struct {
    const fd_t = std.posix.fd_t;
    read: fd_t,
    write: fd_t,
};

fn pipe() !Pipe {
    return @bitCast(try std.posix.pipe());
}

fn getPrompt() ![]const u8 {
    const p = try pipe();

    const close = std.posix.close;
    const dup2 = std.posix.dup2;
    const STDIN_FILENO = std.posix.STDIN_FILENO;
    const STDOUT_FILENO = std.posix.STDOUT_FILENO;
    const STDERR_FILENO = std.posix.STDERR_FILENO;
    const script = @embedFile("./get_prompt.bash");

    if (std.posix.fork()) |pid| {
        if (pid == 0) {
            close(p.read);

            try dup2(p.write, STDOUT_FILENO);
            close(STDIN_FILENO);
            close(STDERR_FILENO); // Do not print errors to the screen

            // Command-line arguments (must include program name as first argument)
            // const args = [_:null]?[*:0]const u8{ "bash", "-i", "-c", script, null };
            var args = [_:null]?[*:0]const u8{ "bash", "-i", "-c", script, null };
            try std.posix.execvpeZ("bash", &args, std.c.environ);

            // std.posix.execvpeZ("bash", @as([*:null]const ?[*:0]const u8, &args[0]), std.os.environ);
            _ = std.posix.execvpeZ("bash", @as([*:null]const ?[*:0]const u8, &args[0]), std.os.environ);
            // kill the child
            std.process.exit(0);
        } else {}
        return "";
    } else |err| {
        return err;
    }
}

pub fn main() !void {
    try clear();

    const allocator = std.heap.page_allocator;
    var ln = Linenoise.init(allocator);
    defer ln.deinit();

    _ = try getPrompt();

    while (try ln.linenoise("hello> ")) |input| {
        defer allocator.free(input);
        std.debug.print("input: {s}\n", .{input});
        try ln.history.add(input);
    }

    // // Prints to stderr (it's a shortcut based on `std.io.getStdErr()`)
    // std.debug.print("All your {s} are belong to us.\n", .{"codebase"});

    // // stdout is for the actual output of your application, for example if you
    // // are implementing gzip, then only the compressed bytes should be sent to
    // // stdout, not any debugging messages.
    // const stdout_file = std.io.getStdOut().writer();
    // var bw = std.io.bufferedWriter(stdout_file);
    // const stdout = bw.writer();

    // try stdout.print("Run `zig build test` to run the tests.\n", .{});

    // try bw.flush(); // Don't forget to flush!
}

test "simple test" {
    var list = std.ArrayList(i32).init(std.testing.allocator);
    defer list.deinit(); // Try commenting this out and see if zig detects the memory leak!
    try list.append(42);
    try std.testing.expectEqual(@as(i32, 42), list.pop());
}

test "fuzz example" {
    const Context = struct {
        fn testOne(context: @This(), input: []const u8) anyerror!void {
            _ = context;
            // Try passing `--fuzz` to `zig build test` and see if it manages to fail this test case!
            try std.testing.expect(!std.mem.eql(u8, "canyoufindme", input));
        }
    };
    try std.testing.fuzz(Context{}, Context.testOne, .{});
}