import {
	PLAIN_METHODS,
	WITH_DATA_METHODS,
	WITH_PARAMS_METHODS,
} from '../constants/methods'
import { isString } from '../helpers/isTypes'
import { dispatchRequest } from '../request/dispatchRequest'
import { CancelToken } from '../request/cancel'
import { AxiosTransformer } from '../request/transformData'
import { deepMerge } from '../helpers/deepMerge'
import {
	AxiosAdapter,
	AxiosAdapterRequestMethod,
	AxiosAdapterPlatformTask,
	AxiosAdapterRequestConfig,
	AxiosAdapterResponseData,
} from '../adpater/createAdapter'
import InterceptorManager, {
	Interceptor,
	InterceptorExecutor,
} from './InterceptorManager'
import MiddlewareManager, {
	MiddlewareCallback,
	MiddlewareContext,
} from './MiddlewareManager'
import { mergeConfig } from './mergeConfig'

/**
 * 请求方法
 */
export type AxiosRequestMethod =
	| AxiosAdapterRequestMethod
	| 'options'
	| 'get'
	| 'head'
	| 'post'
	| 'put'
	| 'patch'
	| 'delete'
	| 'trace'
	| 'connect'

/**
 * 请求头
 */
export interface AxiosRequestHeaders extends AnyObject {
	/**
	 * 通用请求头
	 */
	common?: AnyObject
	/**
	 * options 请求头
	 */
	options?: AnyObject
	/**
	 * get 请求头
	 */
	get?: AnyObject
	/**
	 * head 请求头
	 */
	head?: AnyObject
	/**
	 * post 请求头
	 */
	post?: AnyObject
	/**
	 * put 请求头
	 */
	put?: AnyObject
	/**
	 * delete 请求头
	 */
	delete?: AnyObject
	/**
	 * trace 请求头
	 */
	trace?: AnyObject
	/**
	 * connect 请求头
	 */
	connect?: AnyObject
}

/**
 * 表单数据（上传会用到）
 */
export interface AxiosRequestFormData extends AnyObject {
	/**
	 * 文件名
	 */
	name: string
	/**
	 * 文件路径
	 */
	filePath: string
}

/**
 * 请求数据
 */
export type AxiosRequestData =
	| string
	| AnyObject
	| ArrayBuffer
	| AxiosRequestFormData

/**
 * 响应数据
 */
export type AxiosResponseData = number | AxiosAdapterResponseData

/**
 * 进度对象
 */
export interface AxiosProgressEvent extends AnyObject {
	/**
	 * 上传进度百分比
	 */
	progress: number
}

/**
 * 下载进度对象
 */
export interface AxiosDownloadProgressEvent extends AxiosProgressEvent {
	/**
	 * 已经下载的数据长度，单位 Bytes
	 */
	totalBytesWritten: number
	/**
	 * 预预期需要下载的数据总长度，单位 Bytes
	 */
	totalBytesExpectedToWrite: number
}

/**
 * 监听下载进度
 */
export interface AxiosDownloadProgressCallback {
	(event: AxiosDownloadProgressEvent): void
}

/**
 * 上传进度对象
 */
export interface AxiosUploadProgressEvent extends AxiosProgressEvent {
	/**
	 * 已经上传的数据长度，单位 Bytes
	 */
	totalBytesSent: number
	/**
	 * 预期需要上传的数据总长度，单位 Bytes
	 */
	totalBytesExpectedToSend: number
}

/**
 * 监听上传进度
 */
export interface AxiosUploadProgressCallback {
	(event: AxiosUploadProgressEvent): void
}

/**
 * 请求配置
 */
export interface AxiosRequestConfig
	extends Partial<
		Omit<AxiosAdapterRequestConfig, 'type' | 'success' | 'fail'>
	> {
	/**
	 * 请求适配器
	 */
	adapter?: AxiosAdapter
	/**
	 * 基础路径
	 */
	baseURL?: string
	/**
	 * 请求的 URL
	 */
	url?: string
	/**
	 * 请求参数
	 */
	params?: AnyObject
	/**
	 * 请求数据
	 */
	data?: AxiosRequestData
	/**
	 * 请求头
	 */
	headers?: AxiosRequestHeaders
	/**
	 * 请求方法
	 */
	method?: AxiosRequestMethod
	/**
	 * 取消令牌
	 */
	cancelToken?: CancelToken
	/**
	 * 下载文件
	 */
	download?: boolean
	/**
	 * 上传文件
	 */
	upload?: boolean
	/**
	 * 请求参数系列化函数
	 */
	paramsSerializer?: (params?: AnyObject) => string
	/**
	 * 校验状态码
	 */
	validateStatus?: (status: number) => boolean
	/**
	 * 转换请求数据
	 */
	transformRequest?: AxiosTransformer<AxiosRequestData>
	/**
	 * 转换响应数据
	 */
	transformResponse?: AxiosTransformer<AxiosResponseData>
	/**
	 * 错误处理
	 */
	errorHandler?: (error: unknown) => Promise<AxiosResponse>
	/**
	 * 监听下载进度
	 */
	onDownloadProgress?: AxiosUploadProgressCallback
	/**
	 * 监听上传进度
	 */
	onUploadProgress?: AxiosUploadProgressCallback
}

/**
 * 响应体
 */
export interface AxiosResponse<
	TData extends AxiosResponseData = AxiosResponseData,
> extends AnyObject {
	/**
	 * 状态码
	 */
	status: number
	/**
	 * 状态字符
	 */
	statusText: string
	/**
	 * 响应头
	 */
	headers: AnyObject
	/**
	 * 响应数据
	 */
	data: TData
	/**
	 * 请求配置
	 */
	config: AxiosRequestConfig
	/**
	 * 请求任务
	 */
	request?: AxiosAdapterPlatformTask
}

/**
 * 错误体
 */
export interface AxiosResponseError extends AnyObject {
	/**
	 * 状态码
	 */
	status: number
	/**
	 * 状态字符
	 */
	statusText: string
	/**
	 * 响应头
	 */
	headers: AnyObject
	/**
	 * 错误数据
	 */
	data: AnyObject
	/**
	 * 失败的请求，指没能够成功响应的请求
	 */
	isFail: true
	/**
	 * 请求配置
	 */
	config: AxiosRequestConfig
	/**
	 * 请求任务
	 */
	request?: AxiosAdapterPlatformTask
}

export interface AxiosRequest {
	<TData extends AxiosResponseData>(config: AxiosRequestConfig): Promise<
		AxiosResponse<TData>
	>
	<TData extends AxiosResponseData>(
		url: string,
		config?: AxiosRequestConfig,
	): Promise<AxiosResponse<TData>>
}

/**
 * 普通的请求方法
 */
export type AxiosRequestMethodFn = <TData extends AxiosResponseData>(
	url: string,
	config?: AxiosRequestConfig,
) => Promise<AxiosResponse<TData>>

/**
 * 带参数的请求方法
 */
export type AxiosRequestMethodFnWithParams = <TData extends AxiosResponseData>(
	url: string,
	params?: AnyObject,
	config?: AxiosRequestConfig,
) => Promise<AxiosResponse<TData>>

/**
 * 带数据的请求方法
 */
export type AxiosRequestMethodFnWithData = <TData extends AxiosResponseData>(
	url: string,
	data?: AxiosRequestData,
	config?: AxiosRequestConfig,
) => Promise<AxiosResponse<TData>>

export interface AxiosDomainRequestHandler {
	(config: AxiosRequestConfig): Promise<AxiosResponse>
}

/**
 * Axios 构造函数
 */
export interface AxiosConstructor {
	new (config: AxiosRequestConfig): Axios
}

export default class Axios {
	/**
	 * 父级实例
	 */
	#parent?: Axios

	/**
	 * 默认请求配置
	 */
	defaults: AxiosRequestConfig

	/**
	 * 拦截器
	 */
	interceptors = {
		/**
		 * 请求拦截器
		 */
		request: new InterceptorManager<AxiosRequestConfig>(),
		/**
		 * 响应拦截器
		 */
		response: new InterceptorManager<AxiosResponse>(),
	}

	/**
	 * 中间件
	 */
	#middleware = new MiddlewareManager()

	/**
	 * 发送 options 请求
	 */
	options!: AxiosRequestMethodFn

	/**
	 * 发送 get 请求
	 */
	get!: AxiosRequestMethodFnWithParams

	/**
	 * 发送 head 请求
	 */
	head!: AxiosRequestMethodFnWithParams

	/**
	 * 发送 post 请求
	 */
	post!: AxiosRequestMethodFnWithData

	/**
	 * 发送 put 请求
	 */
	put!: AxiosRequestMethodFnWithData

	/**
	 * 发送 patch 请求
	 */
	patch!: AxiosRequestMethodFnWithData

	/**
	 * 发送 delete 请求
	 */
	delete!: AxiosRequestMethodFnWithParams

	/**
	 * 发送 trace 请求
	 */
	trace!: AxiosRequestMethodFn

	/**
	 * 发送 connect 请求
	 */
	connect!: AxiosRequestMethodFn

	/**
	 *
	 * @param config 默认配置
	 * @param parent 父级实例
	 */
	constructor(config: AxiosRequestConfig, parent?: Axios) {
		this.defaults = config
		this.#parent = parent
	}

	/**
	 * 发送请求
	 */
	request: AxiosRequest = (
		urlOrConfig: string | AxiosRequestConfig,
		config: AxiosRequestConfig = {},
	) => {
		if (isString(urlOrConfig)) {
			config.url = urlOrConfig
		} else {
			config = urlOrConfig
		}
		config = mergeConfig(this.defaults, config)
		config.method = (config.method?.toLowerCase() ??
			'get') as AxiosRequestMethod

		const requestHandler = {
			resolved: this.#handleRequest,
		}
		const errorHandler = {
			rejected: config.errorHandler,
		}
		const chain: (
			| Partial<Interceptor<AxiosRequestConfig>>
			| Partial<Interceptor<AxiosResponse>>
		)[] = []

		this.#eachRequestInterceptors((requestInterceptor) => {
			chain.unshift(requestInterceptor)
		})
		chain.push(requestHandler)
		this.#eachResponseInterceptors((responseInterceptor) => {
			chain.push(responseInterceptor)
		})
		chain.push(errorHandler)

		return chain.reduce(
			(next, { resolved, rejected }) =>
				next.then(
					// @ts-ignore
					resolved,
					rejected,
				),
			Promise.resolve(config),
		) as Promise<AxiosResponse>
	}

	#eachRequestInterceptors(executor: InterceptorExecutor<AxiosRequestConfig>) {
		this.interceptors.request.forEach(executor)
		if (this.#parent) {
			this.#parent.#eachRequestInterceptors(executor)
		}
	}

	#eachResponseInterceptors(executor: InterceptorExecutor<AxiosResponse>) {
		this.interceptors.response.forEach(executor)
		if (this.#parent) {
			this.#parent.#eachResponseInterceptors(executor)
		}
	}

	/**
	 * 注册中间件
	 *
	 * @param middleware 中间件
	 */
	use = (middleware: MiddlewareCallback) => {
		this.#middleware.use(middleware)
		return this
	}

	#handleRequest = async (config: AxiosRequestConfig) => {
		const ctx = this.#middleware.createContext(config)
		await this.#run(ctx, this.#handleResponse)
		return ctx.res as AxiosResponse
	}

	#handleResponse = async (ctx: MiddlewareContext) => {
		ctx.res = await dispatchRequest(ctx.req)
	}

	#run = (
		ctx: MiddlewareContext,
		respond: MiddlewareCallback,
	): Promise<void> => {
		if (!this.#parent) {
			return this.#middleware.run(ctx, respond)
		}
		return this.#middleware.enhanceRun(this.#parent.#run)(ctx, respond)
	}
}

for (const method of PLAIN_METHODS) {
	Axios.prototype[method] = function processRequestMethod(url, config = {}) {
		config.method = method
		return this.request(url, config)
	}
}

for (const method of WITH_PARAMS_METHODS) {
	Axios.prototype[method] = function processRequestMethodWithParams(
		url,
		params = {},
		config = {},
	) {
		config.method = method
		config.params = deepMerge(params, config.params ?? {})
		return this.request(url, config)
	}
}

for (const method of WITH_DATA_METHODS) {
	Axios.prototype[method] = function processRequestMethodWithData(
		url,
		data,
		config = {},
	) {
		config.method = method
		config.data = data
		return this.request(url, config)
	}
}