const std = @import("std");

const Uxn = @import("uxn.zig");
// TODO combine with uxn.zig
const UxnFmt = @import("uxn-instructions.zig");

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

    var args = try std.process.argsWithAllocator(allocator);
    defer args.deinit();
    _ = args.next();
    const rom_path = args.next();

    if (rom_path) |path| {
        var file = try std.fs.cwd().openFile(path, .{});
        defer file.close();
        const rom = try file.readToEndAlloc(allocator, 0xFF00);
        defer allocator.free(rom);

        var uxn = Uxn{ .pc = 0x100 };
        @memcpy(uxn.mem.m[0x100 .. rom.len + 0x100], rom);

        var running = true;
        while (running) {
            std.debug.print("pc={X} code={X} op={s}\n", .{ uxn.pc, uxn.mem.m[uxn.pc], UxnFmt.fmtInstrs(uxn.mem.m[uxn.pc .. uxn.pc +% 1]) });
            if (uxn.eval()) running = false;
        }
    } else return error.NoRom;
}