"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.getTypeChecker()); });
    };
    return Rule;
}(Lint.Rules.TypedRule));
/* tslint:disable:object-literal-sort-keys */
Rule.metadata = {
    ruleName: "promise-function-async",
    description: "Requires any function or method that returns a promise to be marked async.",
    rationale: (_a = ["\n            Ensures that each function is only capable of 1) returning a rejected promise, or 2)\n            throwing an Error object. In contrast, non-`async` `Promise`-returning functions\n            are technically capable of either. This practice removes a requirement for consuming\n            code to handle both cases.\n        "], _a.raw = ["\n            Ensures that each function is only capable of 1) returning a rejected promise, or 2)\n            throwing an Error object. In contrast, non-\\`async\\` \\`Promise\\`-returning functions\n            are technically capable of either. This practice removes a requirement for consuming\n            code to handle both cases.\n        "], Lint.Utils.dedent(_a)),
    optionsDescription: "Not configurable.",
    options: null,
    optionExamples: [true],
    type: "typescript",
    typescriptOnly: false,
    requiresTypeInfo: true,
};
/* tslint:enable:object-literal-sort-keys */
Rule.FAILURE_STRING = "functions that return promises must be async";
exports.Rule = Rule;
function walk(ctx, tc) {
    return ts.forEachChild(ctx.sourceFile, function cb(node) {
        switch (node.kind) {
            case ts.SyntaxKind.MethodDeclaration:
            case ts.SyntaxKind.FunctionDeclaration:
                if (node.body === undefined) {
                    break;
                }
            // falls through
            case ts.SyntaxKind.FunctionExpression:
            case ts.SyntaxKind.ArrowFunction:
                if (!tsutils_1.hasModifier(node.modifiers, ts.SyntaxKind.AsyncKeyword) && returnsPromise(node, tc)) {
                    ctx.addFailure(node.getStart(ctx.sourceFile), node.body.pos, Rule.FAILURE_STRING);
                }
        }
        return ts.forEachChild(node, cb);
    });
}
function returnsPromise(node, tc) {
    var type = tc.getReturnTypeOfSignature(tc.getTypeAtLocation(node).getCallSignatures()[0]);
    return type.symbol !== undefined && type.symbol.name === "Promise";
}
var _a;