/*
   Copyright 2024 Misha Kaletsky

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.


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*/

import type {
  IsNever,
  StrictEqualUsingTSInternalIdenticalToOperator,
  UnionToIntersection,
  UnionToTuple,
} from "./utils";
/**
 * The simple(ish) way to get overload info from a function
 * {@linkcode FunctionType}. Recent versions of TypeScript will match any
 * function against a generic 10-overload type, filling in slots with
 * duplicates of the function. So, we can just match against a single type
 * and get all the overloads.
 *
 * For older versions of TypeScript, we'll need to painstakingly do
 * ten separate matches.
 */
export type TSPost53OverloadsInfoUnion<FunctionType> = FunctionType extends {
  (...args: infer A1): infer R1;
  (...args: infer A2): infer R2;
  (...args: infer A3): infer R3;
  (...args: infer A4): infer R4;
  (...args: infer A5): infer R5;
  (...args: infer A6): infer R6;
  (...args: infer A7): infer R7;
  (...args: infer A8): infer R8;
  (...args: infer A9): infer R9;
  (...args: infer A10): infer R10;
}
  ?
      | ((...p: A1) => R1)
      | ((...p: A2) => R2)
      | ((...p: A3) => R3)
      | ((...p: A4) => R4)
      | ((...p: A5) => R5)
      | ((...p: A6) => R6)
      | ((...p: A7) => R7)
      | ((...p: A8) => R8)
      | ((...p: A9) => R9)
      | ((...p: A10) => R10)
  : never;
/**
 * A function with `unknown` parameters and return type.
 */
export type UnknownFunction = (...args: unknown[]) => unknown;
/**
 * `true` iff {@linkcode FunctionType} is
 * equivalent to `(...args: unknown[]) => unknown`,
 * which is what an overload variant looks like for a non-existent overload.
 * This is useful because older versions of TypeScript end up with
 * 9 "useless" overloads and one real one for parameterless/generic functions.
 *
 * @see {@link https://github.com/microsoft/TypeScript/issues/28867 | Related}
 */
export type IsUselessOverloadInfo<FunctionType> = StrictEqualUsingTSInternalIdenticalToOperator<
  FunctionType,
  UnknownFunction
>;
/**
 * Old versions of TypeScript can sometimes seem to refuse to separate out
 * union members unless you put them each in a pointless tuple and add an
 * extra `infer X` expression. There may be a better way to work around this
 * problem, but since it's not a problem in newer versions of TypeScript,
 * it's not a priority right now.
 */
export type Tuplify<Union> = Union extends infer X ? [X] : never;
/**
 * For older versions of TypeScript, we need two separate workarounds
 * to get overload info. First, we need need to use
 * {@linkcode DecreasingOverloadsInfoUnion} to get the overload info for
 * functions with 1-10 overloads. Then, we need to filter out the
 * "useless" overloads that are present in older versions of TypeScript,
 * for parameterless functions. To do this we use
 * {@linkcode IsUselessOverloadInfo} to remove useless overloads.
 *
 * @see {@link https://github.com/microsoft/TypeScript/issues/28867 | Related}
 */
export type TSPre53OverloadsInfoUnion<FunctionType> =
  Tuplify<DecreasingOverloadsInfoUnion<FunctionType>> extends infer Tup
    ? Tup extends [infer Fn]
      ? IsUselessOverloadInfo<Fn> extends true
        ? never
        : Fn
      : never
    : never;
/**
 * For versions of TypeScript below 5.3, we need to check for 10 overloads,
 * then 9, then 8, etc., to get a union of the overload variants.
 */
export type DecreasingOverloadsInfoUnion<F> = F extends {
  (...args: infer A1): infer R1;
  (...args: infer A2): infer R2;
  (...args: infer A3): infer R3;
  (...args: infer A4): infer R4;
  (...args: infer A5): infer R5;
  (...args: infer A6): infer R6;
  (...args: infer A7): infer R7;
  (...args: infer A8): infer R8;
  (...args: infer A9): infer R9;
  (...args: infer A10): infer R10;
}
  ?
      | ((...p: A1) => R1)
      | ((...p: A2) => R2)
      | ((...p: A3) => R3)
      | ((...p: A4) => R4)
      | ((...p: A5) => R5)
      | ((...p: A6) => R6)
      | ((...p: A7) => R7)
      | ((...p: A8) => R8)
      | ((...p: A9) => R9)
      | ((...p: A10) => R10)
  : F extends {
        (...args: infer A1): infer R1;
        (...args: infer A2): infer R2;
        (...args: infer A3): infer R3;
        (...args: infer A4): infer R4;
        (...args: infer A5): infer R5;
        (...args: infer A6): infer R6;
        (...args: infer A7): infer R7;
        (...args: infer A8): infer R8;
        (...args: infer A9): infer R9;
      }
    ?
        | ((...p: A1) => R1)
        | ((...p: A2) => R2)
        | ((...p: A3) => R3)
        | ((...p: A4) => R4)
        | ((...p: A5) => R5)
        | ((...p: A6) => R6)
        | ((...p: A7) => R7)
        | ((...p: A8) => R8)
        | ((...p: A9) => R9)
    : F extends {
          (...args: infer A1): infer R1;
          (...args: infer A2): infer R2;
          (...args: infer A3): infer R3;
          (...args: infer A4): infer R4;
          (...args: infer A5): infer R5;
          (...args: infer A6): infer R6;
          (...args: infer A7): infer R7;
          (...args: infer A8): infer R8;
        }
      ?
          | ((...p: A1) => R1)
          | ((...p: A2) => R2)
          | ((...p: A3) => R3)
          | ((...p: A4) => R4)
          | ((...p: A5) => R5)
          | ((...p: A6) => R6)
          | ((...p: A7) => R7)
          | ((...p: A8) => R8)
      : F extends {
            (...args: infer A1): infer R1;
            (...args: infer A2): infer R2;
            (...args: infer A3): infer R3;
            (...args: infer A4): infer R4;
            (...args: infer A5): infer R5;
            (...args: infer A6): infer R6;
            (...args: infer A7): infer R7;
          }
        ?
            | ((...p: A1) => R1)
            | ((...p: A2) => R2)
            | ((...p: A3) => R3)
            | ((...p: A4) => R4)
            | ((...p: A5) => R5)
            | ((...p: A6) => R6)
            | ((...p: A7) => R7)
        : F extends {
              (...args: infer A1): infer R1;
              (...args: infer A2): infer R2;
              (...args: infer A3): infer R3;
              (...args: infer A4): infer R4;
              (...args: infer A5): infer R5;
              (...args: infer A6): infer R6;
            }
          ?
              | ((...p: A1) => R1)
              | ((...p: A2) => R2)
              | ((...p: A3) => R3)
              | ((...p: A4) => R4)
              | ((...p: A5) => R5)
              | ((...p: A6) => R6)
          : F extends {
                (...args: infer A1): infer R1;
                (...args: infer A2): infer R2;
                (...args: infer A3): infer R3;
                (...args: infer A4): infer R4;
                (...args: infer A5): infer R5;
              }
            ? ((...p: A1) => R1) | ((...p: A2) => R2) | ((...p: A3) => R3) | ((...p: A4) => R4) | ((...p: A5) => R5)
            : F extends {
                  (...args: infer A1): infer R1;
                  (...args: infer A2): infer R2;
                  (...args: infer A3): infer R3;
                  (...args: infer A4): infer R4;
                }
              ? ((...p: A1) => R1) | ((...p: A2) => R2) | ((...p: A3) => R3) | ((...p: A4) => R4)
              : F extends {
                    (...args: infer A1): infer R1;
                    (...args: infer A2): infer R2;
                    (...args: infer A3): infer R3;
                  }
                ? ((...p: A1) => R1) | ((...p: A2) => R2) | ((...p: A3) => R3)
                : F extends {
                      (...args: infer A1): infer R1;
                      (...args: infer A2): infer R2;
                    }
                  ? ((...p: A1) => R1) | ((...p: A2) => R2)
                  : F extends (...args: infer A1) => infer R1
                    ? (...p: A1) => R1
                    : never;
/**
 * Get a union of overload variants for a function {@linkcode FunctionType}.
 * Does a check for whether we can do the one-shot
 * 10-overload matcher (which works for ts\>5.3), and if not,
 * falls back to the more complicated utility.
 */
export type OverloadsInfoUnion<FunctionType> =
  IsNever<TSPost53OverloadsInfoUnion<(a: 1) => 2>> extends true
    ? TSPre53OverloadsInfoUnion<FunctionType>
    : TSPost53OverloadsInfoUnion<FunctionType>;
/**
 * Allows inferring any function using the `infer` keyword.
 */
export type InferFunctionType<FunctionType extends (...args: any) => any> = FunctionType;
/**
 * A union type of the parameters allowed for any
 * overload of function {@linkcode FunctionType}.
 */
export type OverloadParameters<FunctionType> =
  OverloadsInfoUnion<FunctionType> extends InferFunctionType<infer Fn> ? Parameters<Fn> : never;
/**
 * A union type of the return types for any overload of
 * function {@linkcode FunctionType}.
 */
export type OverloadReturnTypes<FunctionType> =
  OverloadsInfoUnion<FunctionType> extends InferFunctionType<infer Fn> ? ReturnType<Fn> : never;
/**
 * Takes an overload variants {@linkcode Union},
 * produced from {@linkcode OverloadsInfoUnion} and rejects
 * the ones incompatible with parameters {@linkcode Args}.
 */
export type SelectOverloadsInfo<Union extends UnknownFunction, Args extends unknown[]> =
  Union extends InferFunctionType<infer Fn> ? (Args extends Parameters<Fn> ? Fn : never) : never;
/**
 * Creates a new overload (an intersection type) from an existing one,
 * which only includes variant(s) which can accept
 * {@linkcode Args} as parameters.
 */
export type OverloadsNarrowedByParameters<
  FunctionType,
  Args extends OverloadParameters<FunctionType>,
> = UnionToIntersection<SelectOverloadsInfo<OverloadsInfoUnion<FunctionType>, Args>>;
/**
 * The simple(ish) way to get overload info from a constructor
 * {@linkcode ConstructorType}. Recent versions of TypeScript will match any
 * constructor against a generic 10-overload type, filling in slots with
 * duplicates of the constructor. So, we can just match against a single type
 * and get all the overloads.
 *
 * For older versions of TypeScript,
 * we'll need to painstakingly do ten separate matches.
 */
export type TSPost53ConstructorOverloadsInfoUnion<ConstructorType> = ConstructorType extends {
  new (...args: infer A1): infer R1;
  new (...args: infer A2): infer R2;
  new (...args: infer A3): infer R3;
  new (...args: infer A4): infer R4;
  new (...args: infer A5): infer R5;
  new (...args: infer A6): infer R6;
  new (...args: infer A7): infer R7;
  new (...args: infer A8): infer R8;
  new (...args: infer A9): infer R9;
  new (...args: infer A10): infer R10;
}
  ?
      | (new (...p: A1) => R1)
      | (new (...p: A2) => R2)
      | (new (...p: A3) => R3)
      | (new (...p: A4) => R4)
      | (new (...p: A5) => R5)
      | (new (...p: A6) => R6)
      | (new (...p: A7) => R7)
      | (new (...p: A8) => R8)
      | (new (...p: A9) => R9)
      | (new (...p: A10) => R10)
  : never;
/**
 * A constructor function with `unknown` parameters and return type.
 */
export type UnknownConstructor = new (...args: unknown[]) => unknown;
/**
 * Same as {@linkcode IsUselessOverloadInfo}, but for constructors.
 */
export type IsUselessConstructorOverloadInfo<FunctionType> = StrictEqualUsingTSInternalIdenticalToOperator<
  FunctionType,
  UnknownConstructor
>;
/**
 * For older versions of TypeScript, we need two separate workarounds to
 * get constructor overload info. First, we need need to use
 * {@linkcode DecreasingConstructorOverloadsInfoUnion} to get the overload
 * info for constructors with 1-10 overloads. Then, we need to filter out the
 * "useless" overloads that are present in older versions of TypeScript,
 * for parameterless constructors. To do this we use
 * {@linkcode IsUselessConstructorOverloadInfo} to remove useless overloads.
 *
 * @see {@link https://github.com/microsoft/TypeScript/issues/28867 | Related}
 */
export type TSPre53ConstructorOverloadsInfoUnion<ConstructorType> =
  Tuplify<DecreasingConstructorOverloadsInfoUnion<ConstructorType>> extends infer Tup
    ? Tup extends [infer Ctor]
      ? IsUselessConstructorOverloadInfo<Ctor> extends true
        ? never
        : Ctor
      : never
    : never;
/**
 * For versions of TypeScript below 5.3, we need to check for 10 overloads,
 * then 9, then 8, etc., to get a union of the overload variants.
 */
export type DecreasingConstructorOverloadsInfoUnion<ConstructorType> = ConstructorType extends {
  new (...args: infer A1): infer R1;
  new (...args: infer A2): infer R2;
  new (...args: infer A3): infer R3;
  new (...args: infer A4): infer R4;
  new (...args: infer A5): infer R5;
  new (...args: infer A6): infer R6;
  new (...args: infer A7): infer R7;
  new (...args: infer A8): infer R8;
  new (...args: infer A9): infer R9;
  new (...args: infer A10): infer R10;
}
  ?
      | (new (...p: A1) => R1)
      | (new (...p: A2) => R2)
      | (new (...p: A3) => R3)
      | (new (...p: A4) => R4)
      | (new (...p: A5) => R5)
      | (new (...p: A6) => R6)
      | (new (...p: A7) => R7)
      | (new (...p: A8) => R8)
      | (new (...p: A9) => R9)
      | (new (...p: A10) => R10)
  : ConstructorType extends {
        new (...args: infer A1): infer R1;
        new (...args: infer A2): infer R2;
        new (...args: infer A3): infer R3;
        new (...args: infer A4): infer R4;
        new (...args: infer A5): infer R5;
        new (...args: infer A6): infer R6;
        new (...args: infer A7): infer R7;
        new (...args: infer A8): infer R8;
        new (...args: infer A9): infer R9;
      }
    ?
        | (new (...p: A1) => R1)
        | (new (...p: A2) => R2)
        | (new (...p: A3) => R3)
        | (new (...p: A4) => R4)
        | (new (...p: A5) => R5)
        | (new (...p: A6) => R6)
        | (new (...p: A7) => R7)
        | (new (...p: A8) => R8)
        | (new (...p: A9) => R9)
    : ConstructorType extends {
          new (...args: infer A1): infer R1;
          new (...args: infer A2): infer R2;
          new (...args: infer A3): infer R3;
          new (...args: infer A4): infer R4;
          new (...args: infer A5): infer R5;
          new (...args: infer A6): infer R6;
          new (...args: infer A7): infer R7;
          new (...args: infer A8): infer R8;
        }
      ?
          | (new (...p: A1) => R1)
          | (new (...p: A2) => R2)
          | (new (...p: A3) => R3)
          | (new (...p: A4) => R4)
          | (new (...p: A5) => R5)
          | (new (...p: A6) => R6)
          | (new (...p: A7) => R7)
          | (new (...p: A8) => R8)
      : ConstructorType extends {
            new (...args: infer A1): infer R1;
            new (...args: infer A2): infer R2;
            new (...args: infer A3): infer R3;
            new (...args: infer A4): infer R4;
            new (...args: infer A5): infer R5;
            new (...args: infer A6): infer R6;
            new (...args: infer A7): infer R7;
          }
        ?
            | (new (...p: A1) => R1)
            | (new (...p: A2) => R2)
            | (new (...p: A3) => R3)
            | (new (...p: A4) => R4)
            | (new (...p: A5) => R5)
            | (new (...p: A6) => R6)
            | (new (...p: A7) => R7)
        : ConstructorType extends {
              new (...args: infer A1): infer R1;
              new (...args: infer A2): infer R2;
              new (...args: infer A3): infer R3;
              new (...args: infer A4): infer R4;
              new (...args: infer A5): infer R5;
              new (...args: infer A6): infer R6;
            }
          ?
              | (new (...p: A1) => R1)
              | (new (...p: A2) => R2)
              | (new (...p: A3) => R3)
              | (new (...p: A4) => R4)
              | (new (...p: A5) => R5)
              | (new (...p: A6) => R6)
          : ConstructorType extends {
                new (...args: infer A1): infer R1;
                new (...args: infer A2): infer R2;
                new (...args: infer A3): infer R3;
                new (...args: infer A4): infer R4;
                new (...args: infer A5): infer R5;
              }
            ?
                | (new (...p: A1) => R1)
                | (new (...p: A2) => R2)
                | (new (...p: A3) => R3)
                | (new (...p: A4) => R4)
                | (new (...p: A5) => R5)
            : ConstructorType extends {
                  new (...args: infer A1): infer R1;
                  new (...args: infer A2): infer R2;
                  new (...args: infer A3): infer R3;
                  new (...args: infer A4): infer R4;
                }
              ? (new (...p: A1) => R1) | (new (...p: A2) => R2) | (new (...p: A3) => R3) | (new (...p: A4) => R4)
              : ConstructorType extends {
                    new (...args: infer A1): infer R1;
                    new (...args: infer A2): infer R2;
                    new (...args: infer A3): infer R3;
                  }
                ? (new (...p: A1) => R1) | (new (...p: A2) => R2) | (new (...p: A3) => R3)
                : ConstructorType extends {
                      new (...args: infer A1): infer R1;
                      new (...args: infer A2): infer R2;
                    }
                  ? (new (...p: A1) => R1) | (new (...p: A2) => R2)
                  : ConstructorType extends new (...args: infer A1) => infer R1
                    ? new (...p: A1) => R1
                    : never;
/**
 * Get a union of overload variants for a constructor
 * {@linkcode ConstructorType}. Does a check for whether we can do the
 * one-shot 10-overload matcher (which works for ts\>5.3), and if not,
 * falls back to the more complicated utility.
 */
export type ConstructorOverloadsUnion<ConstructorType> =
  IsNever<TSPost53ConstructorOverloadsInfoUnion<new (a: 1) => any>> extends true
    ? TSPre53ConstructorOverloadsInfoUnion<ConstructorType>
    : TSPost53ConstructorOverloadsInfoUnion<ConstructorType>;
/**
 * Allows inferring any constructor using the `infer` keyword.
 */
export type InferConstructor<ConstructorType extends new (...args: any) => any> = ConstructorType;
/**
 * A union type of the parameters allowed for any overload
 * of constructor {@linkcode ConstructorType}.
 */
export type ConstructorOverloadParameters<ConstructorType> =
  ConstructorOverloadsUnion<ConstructorType> extends InferConstructor<infer Ctor> ? ConstructorParameters<Ctor> : never;
/**
 * Calculates the number of overloads for a given function type.
 */
export type NumOverloads<FunctionType> = UnionToTuple<OverloadsInfoUnion<FunctionType>>["length"];