import {
    BooleanType,
    StringType,
    ValueType,
    NullType,
    typeToString,
    NumberType,
    isValidType,
    isValidNativeType
} from '../types';
import {RuntimeError} from '../runtime_error';
import {typeOf} from '../values';

import type {Expression} from '../expression';
import type {ParsingContext} from '../parsing_context';
import type {EvaluationContext} from '../evaluation_context';
import type {Type} from '../types';

export class In implements Expression {
    type: Type;
    needle: Expression;
    haystack: Expression;

    constructor(needle: Expression, haystack: Expression) {
        this.type = BooleanType;
        this.needle = needle;
        this.haystack = haystack;
    }

    static parse(args: ReadonlyArray<unknown>, context: ParsingContext): Expression {
        if (args.length !== 3) {
            return context.error(
                `Expected 2 arguments, but found ${args.length - 1} instead.`
            ) as null;
        }

        const needle = context.parse(args[1], 1, ValueType);

        const haystack = context.parse(args[2], 2, ValueType);

        if (!needle || !haystack) return null;

        if (!isValidType(needle.type, [BooleanType, StringType, NumberType, NullType, ValueType])) {
            return context.error(
                `Expected first argument to be of type boolean, string, number or null, but found ${typeToString(needle.type)} instead`
            ) as null;
        }

        return new In(needle, haystack);
    }

    evaluate(ctx: EvaluationContext) {
        const needle = this.needle.evaluate(ctx) as any;
        const haystack = this.haystack.evaluate(ctx) as any;

        if (!haystack) return false;

        if (!isValidNativeType(needle, ['boolean', 'string', 'number', 'null'])) {
            throw new RuntimeError(
                `Expected first argument to be of type boolean, string, number or null, but found ${typeToString(typeOf(needle))} instead.`
            );
        }

        if (!isValidNativeType(haystack, ['string', 'array'])) {
            throw new RuntimeError(
                `Expected second argument to be of type array or string, but found ${typeToString(typeOf(haystack))} instead.`
            );
        }

        return haystack.indexOf(needle) >= 0;
    }

    eachChild(fn: (_: Expression) => void) {
        fn(this.needle);
        fn(this.haystack);
    }

    outputDefined() {
        return true;
    }
}