const Class = @import("../../Class.zig");
const ConstantPoolInfo = Class.ConstantPoolInfo;
const ResolveError = Class.ResolveError;

class_index: u16,
name_and_type_index: u16,

const Self = @This();

pub fn class(self: *const Self, constant_pool: []const ?ConstantPoolInfo) ResolveError!ConstantPoolInfo {
    const class_index = self.class_index - 1;
    if (class_index >= constant_pool.len) return ResolveError.InvalidConstantPoolIndex;
    const cp_info = constant_pool[class_index];
    if (cp_info == null or @as(ConstantPoolInfo.Tag, cp_info.?) != .class) return ResolveError.InvalidConstantType;
    return cp_info.?;
}

pub fn nameAndType(self: *const Self, constant_pool: []const ?ConstantPoolInfo) ResolveError!ConstantPoolInfo {
    const name_and_type_index = self.name_and_type_index - 1;
    if (name_and_type_index >= constant_pool.len) return ResolveError.InvalidConstantPoolIndex;
    const cp_info = constant_pool[name_and_type_index];
    if (cp_info == null or @as(ConstantPoolInfo.Tag, cp_info.?) != .name_and_type) return ResolveError.InvalidConstantType;
    return cp_info.?;
}