import { compareDynamic } from "../compare/dynamic.js";
import { compareSymbols, compareInts } from "../compare/primitives.js";
import { makeTypeParser } from "../parser/type_parser.js";
import { newDynamic } from "../primitives/dynamic.js";
import { makeEnumCompareFn } from "../structures/enum.js";
import { makeStructCompareFn } from "../structures/struct.js";
import { Slot, Transformation, Value, Write } from "./value_slot.js";


// comparison functions are mutually recursive...

export const compareSlot = makeEnumCompareFn([
  { l: "new", r: () => compareSymbols },
  { l: "write", r: () => compareWrite },
]);

export const compareWrite = makeStructCompareFn([
  { l: "slot", r: () => compareSlot },
  { l: "value", r: () => compareValue },
  { l: "depth", r: () => compareInts },
]);

export const compareTransformation = makeStructCompareFn([
  { l: "input", r: () => compareValue },
  { l: "fn", r: () => compareValue },
  { l: "output", r: () => compareDynamic },
]);

export const compareValue = makeEnumCompareFn([
  { l: "literal", r: () => compareDynamic },
  { l: "read", r: () => compareWrite },
  { l: "transform", r: () => compareTransformation },
]);

const mkType = makeTypeParser({
  extraPrimitives: [
    ["Value", Value],
    ["Slot" , Slot ],
    ["Write", Write],
    ["Transformation", Transformation],
  ],
});

export const ModuleVersioningCompare = [
  // comparison
  ["compareSlot" , newDynamic(compareSlot )(mkType("Slot -> Slot -> Ordering"))],
  ["compareValue", newDynamic(compareValue)(mkType("Value -> Value -> Ordering"))],
  ["compareWrite", newDynamic(compareWrite)(mkType("Write -> Write -> Ordering"))],
  ["compareTransformation", newDynamic(compareTransformation)(mkType("Transformation -> Transformation -> Ordering"))],
];