const debug = @import("./debug.zig");

const io = @import("./io.zig");

// TODO: Finish implementing.

pub fn Map(comptime Index: type, comptime Element: type) type {
	return struct {
		free_index: Index = 0,
		entries: []Entry = &.{},

		const Entry = union (enum) {
			free_index: usize,
			element: Element,
		};

		const Self = @This();

		pub fn fetch(self: *Self, index: Index) *Element {
			const entry = &self.entries[index];

			debug.assert(entry.* == .element);

			return &entry.element;
		}

		pub fn deinit(self: *Self, allocator: io.Allocator) void {
			io.deallocate(allocator, self.entries);
		}

		pub fn insert(self: *Self, allocator: io.Allocator, value: Element) io.AllocationError!Index {
			_ = self;
			_ = allocator;
			_ = value;

			return 0;
		}

		pub fn remove(self: *Self, index: Index) void {
			const entry = &self.entries[index];

			debug.assert(entry.* == .element);
		}
	};
}