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import { compose } from './compose.ts'import { Context } from './context.ts'import type { Env } from './context.ts'import { extendRequestPrototype } from './request.ts'import type { Router } from './router.ts'import { METHOD_NAME_ALL, METHOD_NAME_ALL_LOWERCASE } from './router.ts'import { TrieRouter } from './router/trie-router/index.ts' // Default Routerimport { getPathFromURL, mergePath } from './utils/url.ts'
export type Handler<RequestParamKeyType extends string = string, E = Env> = (  c: Context<RequestParamKeyType, E>,  next: Next) => Response | Promise<Response> | Promise<void> | Promise<Response | undefined>export type NotFoundHandler<E = Env> = (c: Context<string, E>) => Response | Promise<Response>export type ErrorHandler<E = Env> = (err: Error, c: Context<string, E>) => Responseexport type Next = () => Promise<void>
// eslint-disable-next-line @typescript-eslint/no-unused-varstype ParamKeyName<NameWithPattern> = NameWithPattern extends `${infer Name}{${infer _Pattern}`  ? Name  : NameWithPattern
type ParamKey<Component> = Component extends `:${infer NameWithPattern}`  ? ParamKeyName<NameWithPattern>  : never
type ParamKeys<Path> = Path extends `${infer Component}/${infer Rest}`  ? ParamKey<Component> | ParamKeys<Rest>  : ParamKey<Path>
interface HandlerInterface<T extends string, E extends Env = Env, U = Hono<E, T>> {  // app.get('/', handler, handler...)  <Path extends string>(    path: Path,    ...handlers: Handler<ParamKeys<Path> extends never ? string : ParamKeys<Path>, E>[]  ): U  (path: string, ...handlers: Handler<string, E>[]): U  // app.get(handler...)  <Path extends string>(    ...handlers: Handler<ParamKeys<Path> extends never ? string : ParamKeys<Path>, E>[]  ): U  (...handlers: Handler<string, E>[]): U}
const methods = ['get', 'post', 'put', 'delete', 'head', 'options', 'patch'] as consttype Methods = typeof methods[number] | typeof METHOD_NAME_ALL_LOWERCASE
function defineDynamicClass(): {  new <E extends Env, T extends string, U>(): {    [K in Methods]: HandlerInterface<T, E, U>  }} {  return class {} as any}
interface Route<E extends Env> {  path: string  method: string  handler: Handler<string, E>}
export class Hono<E extends Env = Env, P extends string = '/'> extends defineDynamicClass()<  E,  P,  Hono<E, P>> {  readonly router: Router<Handler<string, E>> = new TrieRouter()  readonly strict: boolean = true // strict routing - default is true  private _tempPath: string = ''  private path: string = '/'
  routes: Route<E>[] = []
  constructor(init: Partial<Pick<Hono, 'router' | 'strict'>> = {}) {    super()
    extendRequestPrototype()
    const allMethods = [...methods, METHOD_NAME_ALL_LOWERCASE]    allMethods.map((method) => {      this[method] = <Path extends string = ''>(        args1: Path | Handler<ParamKeys<Path>, E>,        ...args: [Handler<ParamKeys<Path>, E>]      ) => {        if (typeof args1 === 'string') {          this.path = args1        } else {          this.addRoute(method, this.path, args1)        }        args.map((handler) => {          if (typeof handler !== 'string') {            this.addRoute(method, this.path, handler)          }        })        return this      }    })
    Object.assign(this, init)  }
  private notFoundHandler: NotFoundHandler = (c: Context) => {    const message = '404 Not Found'    return c.text(message, 404)  }
  private errorHandler: ErrorHandler = (err: Error, c: Context) => {    console.error(`${err.stack || err.message}`)    const message = 'Internal Server Error'    return c.text(message, 500)  }
  route(path: string, app?: Hono<any>): Hono<E, P> {    this._tempPath = path    if (app) {      app.routes.map((r) => {        this.addRoute(r.method, r.path, r.handler)      })      this._tempPath = ''    }
    return this  }
  use(path: string, ...middleware: Handler<string, E>[]): Hono<E, P>  use(...middleware: Handler<string, E>[]): Hono<E, P>  use(arg1: string | Handler<string, E>, ...handlers: Handler<string, E>[]): Hono<E, P> {    if (typeof arg1 === 'string') {      this.path = arg1    } else {      handlers.unshift(arg1)    }    handlers.map((handler) => {      this.addRoute(METHOD_NAME_ALL, this.path, handler)    })    return this  }
  onError(handler: ErrorHandler<E>): Hono<E, P> {    this.errorHandler = handler as ErrorHandler    return this  }
  notFound(handler: NotFoundHandler<E>): Hono<E, P> {    this.notFoundHandler = handler as NotFoundHandler    return this  }
  private addRoute(method: string, path: string, handler: Handler<string, E>): void {    method = method.toUpperCase()    if (this._tempPath) {      path = mergePath(this._tempPath, path)    }    this.router.add(method, path, handler)    const r: Route<E> = { path: path, method: method, handler: handler }    this.routes.push(r)  }
  private matchRoute(method: string, path: string) {    return this.router.match(method, path)  }
  private async dispatch(    request: Request,    eventOrExecutionCtx?: ExecutionContext | FetchEvent,    env?: E  ): Promise<Response> {    const path = getPathFromURL(request.url, this.strict)    const method = request.method
    const result = this.matchRoute(method, path)    request.paramData = result?.params
    const handlers = result ? result.handlers : [this.notFoundHandler]
    const c = new Context<string, E>(request, env, eventOrExecutionCtx, this.notFoundHandler)
    const composed = compose<Context>(handlers, this.errorHandler, this.notFoundHandler)    let context: Context    try {      context = await composed(c)      if (!context.finalized) {        throw new Error(          'Context is not finalized. You may forget returning Response object or `await next()`'        )      }    } catch (err) {      if (err instanceof Error) {        return this.errorHandler(err, c)      }      throw err    }
    return context.res  }
  async handleEvent(event: FetchEvent): Promise<Response> {    return this.dispatch(event.request, event)  }
  async fetch(request: Request, env?: E, executionCtx?: ExecutionContext): Promise<Response> {    return this.dispatch(request, executionCtx, env)  }
  request(input: RequestInfo, requestInit?: RequestInit): Promise<Response> {    const req = input instanceof Request ? input : new Request(input, requestInit)    return this.dispatch(req)  }}