"use strict";
/**
 * @license
 * Copyright 2016 Palantir Technologies, Inc.
 *
 * 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.
 */
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var tsutils_1 = require("tsutils");
var ts = require("typescript");
var Lint = require("../index");
var Rule = (function (_super) {
    tslib_1.__extends(Rule, _super);
    function Rule() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    Rule.prototype.applyWithProgram = function (sourceFile, program) {
        return this.applyWithFunction(sourceFile, function (ctx) { return walk(ctx, program); });
    };
    return Rule;
}(Lint.Rules.TypedRule));
/* tslint:disable:object-literal-sort-keys */
Rule.metadata = {
    ruleName: "restrict-plus-operands",
    description: "When adding two variables, operands must both be of type number or of type string.",
    optionsDescription: "Not configurable.",
    options: null,
    optionExamples: [true],
    type: "functionality",
    typescriptOnly: false,
    requiresTypeInfo: true,
};
/* tslint:enable:object-literal-sort-keys */
Rule.INVALID_TYPES_ERROR = "Operands of '+' operation must either be both strings or both numbers";
exports.Rule = Rule;
function walk(ctx, program) {
    return ts.forEachChild(ctx.sourceFile, function cb(node) {
        if (tsutils_1.isBinaryExpression(node) && node.operatorToken.kind === ts.SyntaxKind.PlusToken) {
            var tc = program.getTypeChecker();
            var leftType = getBaseTypeOfLiteralType(tc.getTypeAtLocation(node.left));
            var rightType = getBaseTypeOfLiteralType(tc.getTypeAtLocation(node.right));
            if (leftType === "invalid" || rightType === "invalid" || leftType !== rightType) {
                return ctx.addFailureAtNode(node, Rule.INVALID_TYPES_ERROR);
            }
        }
        return ts.forEachChild(node, cb);
    });
}
function getBaseTypeOfLiteralType(type) {
    if (Lint.isTypeFlagSet(type, ts.TypeFlags.StringLiteral) || Lint.isTypeFlagSet(type, ts.TypeFlags.String)) {
        return "string";
    }
    else if (Lint.isTypeFlagSet(type, ts.TypeFlags.NumberLiteral) || Lint.isTypeFlagSet(type, ts.TypeFlags.Number)) {
        return "number";
    }
    else if (tsutils_1.isUnionType(type) && !Lint.isTypeFlagSet(type, ts.TypeFlags.Enum)) {
        var types = type.types.map(getBaseTypeOfLiteralType);
        return allSame(types) ? types[0] : "invalid";
    }
    else if (Lint.isTypeFlagSet(type, ts.TypeFlags.EnumLiteral)) {
        // Compatibility for TypeScript pre-2.4, which used EnumLiteralType instead of LiteralType
        getBaseTypeOfLiteralType(type.baseType);
    }
    return "invalid";
}
function allSame(array) {
    return array.every(function (value) { return value === array[0]; });
}