import { IPlugin } from '../../intf/IPlugin'
import { AxiosInstance } from 'axios'
import { combineURLs, isAbsoluteURL } from '../../utils/build-full-path'
import { IRequestOptions } from '../../intf/IRequestOptions'

/** 提供mock能力插件 */
export const mock = (): IPlugin => {
    return {
        pluginName: 'mock',
        handler: (axios: AxiosInstance) => {
            // 注入mock依赖
            axios.interceptors.request.use((req: IRequestOptions) => {
                const { url, mock } = req
                const { command } = process.env
                let mockURL!: string
                let target: string | undefined
                if (!url) return req
                if (command !== 'serve') return req
                if ((req.headers?.common as any)?.mockURL) {
                    mockURL = (req.headers?.common as any)?.mockURL
                } else if (req.headers?.mockURL) {
                    mockURL = req.headers?.mockURL
                }

                if (mock) {
                    if (!mockURL) {
                        throw new Error(
                            `headers 中似乎并没有配置 'mockURL', 请通过 配置 'headers: { mockURL:''}' 或 使用 env() 插件启用mock能力`
                        )
                    }
                    // 填充 baseUrl
                    if (!isAbsoluteURL(url)) {
                        target = combineURLs(mockURL, url)
                    } else {
                        // 转换为url对象
                        const u = new URL(url)
                        // 去除origin, 并附加 mockURL
                        target = combineURLs(mockURL, url.replace(u.origin, ''))
                    }
                }

                req.url = target ?? req.url
                return req
            })
        }
    }
}