import {z} from 'zod'

export type BasicConfigs = {type: string, td_authentication_id: string, role?: string | undefined, warehouse: string, db: string, schema: string, incremental?: boolean | undefined} | {type: string, td_authentication_id: string, role?: string | undefined, warehouse: string, db: string, schema: string, incremental?: boolean | undefined};

export type CreateApiV1GuessArgs = {body: {basic_configs?: BasicConfigs | undefined} | {[key: string]: unknown}};

export type CreateApiV1GuessOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const basicConfigs = z.discriminatedUnion("type", [z.object({type: z.string(), td_authentication_id: z.string(), role: z.string().optional(), warehouse: z.string(), db: z.string(), schema: z.string(), incremental: z.boolean().optional()}), z.object({type: z.string(), td_authentication_id: z.string(), role: z.string().optional(), warehouse: z.string(), db: z.string(), schema: z.string(), incremental: z.boolean().optional()})]);

export const advancedConfigs = z.array(z.object({target_table: z.string().optional(), config: z.discriminatedUnion("type", [z.object({type: z.string().optional(), source_type: z.enum(["table_view", "query"]).optional(), query: z.string().optional(), select: z.string().optional(), table: z.string().optional(), where: z.string().optional(), order_by: z.string().optional(), incremental: z.boolean().optional(), incremental_columns: z.array(z.string()).optional(), invalid_value_option: z.enum(["fail_job", "insert_null", "ignore_row"]).optional()}), z.object({type: z.string().optional(), source_type: z.enum(["table_view", "query"]).optional(), query: z.string().optional(), select: z.string().optional(), table: z.string().optional(), where: z.string().optional(), order_by: z.string().optional(), incremental: z.boolean().optional(), incremental_columns: z.array(z.string()).optional(), invalid_value_option: z.enum(["fail_job", "insert_null", "ignore_row"]).optional()})]).optional()}));

export const guessResult = z.object({basic_configs: basicConfigs.optional(), advanced_configs: advancedConfigs.optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Guess DWH Integration configuration
 * 
 * POST /v1/guess
 */
export const createApiV1Guess = async (args: CreateApiV1GuessArgs, options?: CreateApiV1GuessOptions) => {
const {baseUrl = "https://dwh-integration-api.treasuredata.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (apiKey !== undefined) headers.set("Authorization", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/guess${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(guessResult, await res.json())
};