// Type definitions for koa-router v7.x
// Project: https://github.com/alexmingoia/koa-router/
// Definitions by: Jerry Chin <https://github.com/hellopao/>
// Definitions: https://github.com/hellopao/DefinitelyTyped

/* =================== USAGE ===================

    import * as Router from "koa-router";
    var router = new Router();

 =============================================== */

/// <reference path="../koa/koa.d.ts" />

declare module "koa-router" {

    import * as Koa from "koa";

    module Layer {

        export interface ILayerOptions {
            name: string;
            sensitive?: boolean;
            strict?: boolean;
        }

    }

    module Router {

        export interface IRouterOptions {
            /**
             * Router prefixes
             */
            prefix?: string;
            /**
             * HTTP verbs
             */
            methods?: string[];
            routerPath?: string;
            sensitive?: boolean;
        }

        export interface IRouterContext extends Koa.Context {
            /**
             * url params
             */
            params: any;
        }

        export interface IMiddleware {
            (ctx: Router.IRouterContext, next: () => Promise<any>): any;
        }

        export interface IParamMiddleware {
            (param: string, ctx: Router.IRouterContext, next: () => Promise<any>): any;
        }

        export interface IRouterAllowedMethodsOptions {
            /**
             * throw error instead of setting status and header
             */
            throw?: boolean;
            /**
             * throw the returned value in place of the default NotImplemented error
             */
            notImplemented?: () => any;
            /**
             * throw the returned value in place of the default MethodNotAllowed error
             */
            methodNotAllowed?: () => any;
        }

    }

    class Layer {

        opts: Layer.ILayerOptions;
        name: string;
        methods: string[];
        paramNames: string[];
        stack: Router.IMiddleware[];
        regexp: RegExp;
        path: string;

        constructor(path: string | RegExp, methods: string[], middleware: Router.IMiddleware, opts?: Layer.ILayerOptions);
        constructor(path: string | RegExp, methods: string[], middleware: Array<Router.IMiddleware>, opts?: Layer.ILayerOptions);

        /**
         * Returns whether request `path` matches route.
         */
        match(path: string): boolean;

        /**
         * Returns map of URL parameters for given `path` and `paramNames`.
         */
        params(path: string | RegExp, captures: string[], existingParams?: Object): Object;

        /**
         * Returns array of regexp url path captures.
         */
        captures(path: string): string[];

        /**
         * Generate URL for route using given `params`.
         */
        url(params: Object): string;

        /**
         * Run validations on route named parameters.
         */
        param(param: string, fn: Router.IMiddleware): Layer;

        /**
         * Prefix route path.
         */
        setPrefix(prefix: string): Layer;
    }

    class Router {

        params: Object;

        stack: Array<Layer>;

        /**
         * Create a new router.
         */
        constructor(opt?: Router.IRouterOptions);

        /**
         * Use given middleware.
         *
         * Middleware run in the order they are defined by `.use()`. They are invoked
         * sequentially, requests start at the first middleware and work their way
         * "down" the middleware stack.
         */
        use(...middleware: Array<Router.IMiddleware>): Router;
        use(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * HTTP get method
         */
        get(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        get(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * HTTP post method
         */
        post(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        post(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * HTTP put method
         */
        put(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        put(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * HTTP delete method
         */
        delete(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        delete(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * Alias for `router.delete()` because delete is a reserved word
         */
        del(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        del(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * HTTP head method
         */
        head(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        head(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * HTTP options method
         */
        options(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        options(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * HTTP path method
         */
        patch(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        patch(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * Register route with all methods.
         */
        all(name: string, path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;
        all(path: string | RegExp, ...middleware: Array<Router.IMiddleware>): Router;

        /**
         * Set the path prefix for a Router instance that was already initialized.
         */
        prefix(prefix: string): Router;

        /**
         * Returns router middleware which dispatches a route matching the request.
         */
        routes(): Router.IMiddleware;

        /**
         * Returns router middleware which dispatches a route matching the request.
         */
        middlewares(): Router.IMiddleware;

        /**
         * Returns separate middleware for responding to `OPTIONS` requests with
         * an `Allow` header containing the allowed methods, as well as responding
         * with `405 Method Not Allowed` and `501 Not Implemented` as appropriate.
         */
        allowedMethods(options?: Router.IRouterAllowedMethodsOptions): Router.IMiddleware;

        /**
         * Redirect `source` to `destination` URL with optional 30x status `code`.
         *
         * Both `source` and `destination` can be route names.
         */
        redirect(source: string, destination: string, code?: number): Router;

        /**
         * Create and register a route.
         */
        register(path: string | RegExp, methods: string[], middleware: Router.IMiddleware, opts?: Object): Layer;

        /**
         * Lookup route with given `name`.
         */
        route(name: string): Layer;
        route(name: string): boolean;

        /**
         * Generate URL for route. Takes either map of named `params` or series of
         * arguments (for regular expression routes)
         */
        url(name: string, params: Object): string;
        url(name: string, params: Object): Error;

        /**
         * Match given `path` and return corresponding routes.
         */
        match(name: string, method: string): Object;

        /**
         * Run middleware for named route parameters. Useful for auto-loading or validation.
         */
        param(param: string, middleware: Router.IParamMiddleware): Router;

        /**
         * Generate URL from url pattern and given `params`.
         */
        static url(path: string | RegExp, params: Object): string;
    }

    export = Router;
}