const std = @import("std");
const unicode = std.unicode;

pub const JavascriptString = []u16;
pub fn newJavascriptString(comptime text: []const u8) JavascriptString {
    return unicode.utf8ToUtf16LeStringLiteral(text);
}

pub const NodeIndex = u32;
pub const NodeIndexNone = 4294967293;

// TODO: figure out if we actually need this
// -- original comment --
// Files are parsed in parallel for speed. We want to allow each parser to
// generate symbol IDs that won't conflict with each other. We also want to be
// able to quickly merge symbol tables from all files into one giant symbol
// table.
//
// We can accomplish both goals by giving each symbol ID two parts: a source
// index that is unique to the parser goroutine, and an inner index that
// increments as the parser generates new symbol IDs. Then a symbol map can
// be an array of arrays indexed first by source index, then by inner index.
// The maps can be merged quickly by creating a single outer array containing
// all inner arrays from all parsed files.

pub const RefHashCtx = struct {
    pub fn hash(ctx: @This(), key: Ref) u32 {
        return @truncate(u32, std.hash.Wyhash.hash(0, std.mem.asBytes(&key)));
    }

    pub fn eql(ctx: @This(), ref: Ref, b: Ref) bool {
        return std.mem.readIntNative(u64, std.mem.asBytes(&ref)) == std.mem.readIntNative(u64, std.mem.asBytes(&b));
    }
};

pub const Ref = packed struct {
    source_index: Int = std.math.maxInt(Ref.Int),
    inner_index: Int = 0,
    is_source_contents_slice: bool = false,

    // 2 bits of padding for whatever is the parent
    pub const Int = u30;
    pub const None = Ref{
        .inner_index = std.math.maxInt(Ref.Int),
        .source_index = std.math.maxInt(Ref.Int),
    };
    pub const RuntimeRef = Ref{
        .inner_index = std.math.maxInt(Ref.Int),
        .source_index = std.math.maxInt(Ref.Int) - 1,
    };
    pub fn toInt(int: anytype) Int {
        return @intCast(Int, int);
    }

    pub fn hash(key: Ref) u32 {
        return @truncate(u32, std.hash.Wyhash.hash(0, std.mem.asBytes(&key)));
    }

    pub fn eql(ref: Ref, b: Ref) bool {
        return std.mem.readIntNative(u64, std.mem.asBytes(&ref)) == std.mem.readIntNative(u64, std.mem.asBytes(&b));
    }
    pub fn isNull(self: *const Ref) bool {
        return self.source_index == std.math.maxInt(Ref.Int) and self.inner_index == std.math.maxInt(Ref.Int);
    }

    pub fn isSourceNull(self: *const Ref) bool {
        return self.source_index == std.math.maxInt(Ref.Int);
    }

    pub fn isSourceIndexNull(int: anytype) bool {
        return int == std.math.maxInt(Ref.Int);
    }

    pub fn jsonStringify(self: *const Ref, options: anytype, writer: anytype) !void {
        return try std.json.stringify([2]u32{ self.source_index, self.inner_index }, options, writer);
    }
};

// This is kind of the wrong place, but it's shared between files
pub const RequireOrImportMeta = struct {
    // CommonJS files will return the "require_*" wrapper function and an invalid
    // exports object reference. Lazily-initialized ESM files will return the
    // "init_*" wrapper function and the exports object for that file.
    wrapper_ref: Ref = Ref.None,
    exports_ref: Ref = Ref.None,
    is_wrapper_async: bool = false,
};
pub inline fn debug(comptime fmt: []const u8, args: anytype) void {
    // Output.print(fmt, args);
}
pub inline fn debugl(
    comptime fmt: []const u8,
) void {
    // Output.print("{s}\n", .{fmt});
}