import { createUseFetch } from '#imports'

/** 与 `R.success` / `R.error` 返回结构对齐 */
export type ApiResponse<T = unknown> = {
    code: number
    message: string
    data: T
}

/** Wraps API error responses, preserving the data field for field-level error handling */
export class ApiError extends Error {
    constructor(message: string, public data: unknown) {
        super(message)
        this.name = 'ApiError'
    }
}

/** 从 Nitro 推断的响应体上剥离一层 `ApiResponse`，得到 `data` 字段类型 */
export type UnwrapApiResponse<T> = T extends ApiResponse<infer D> ? D : T

export function unwrapApiBody<T>(payload: ApiResponse<T>): T {
    if (payload.code !== 0) {
        throw new ApiError(payload.message, payload.data)
    }
    return payload.data
}


export const request = $fetch.create({})

const httpFetchDefaults = {
    retry: 0,
    $fetch: request,
    transform: unwrapApiBody,
}

export const _useHttpFetch = createUseFetch(httpFetchDefaults)
export const _useLazyHttpFetch = createUseFetch({
    ...httpFetchDefaults,
    lazy: true,
})