import {z} from 'zod'

export type WorkspaceQuery = {version?: 1 | undefined, sql: string};

export type ScenarioSearch = {n_trials?: number | undefined, max_steps?: number | undefined, stop_after_improvement?: number | undefined, rescore_every?: number | undefined, reattribute_every?: number | undefined, top_k_features?: (number | null) | undefined, random_state?: (number | null) | undefined};

export type FeatureConstraintSchema = {immutable?: boolean | undefined, monotonic?: ('increase' | 'decrease' | null) | undefined, value_range?: (Array<unknown> | null) | undefined, allowed_values?: (Array<unknown> | null) | undefined, preserve_sign?: boolean | undefined, integer?: boolean | undefined, max_percentile_delta?: (number | null) | undefined};

export type CategoryHierarchySchema = {kind?: 'category_hierarchy' | undefined, parent: string, child: string, child_to_parent: Array<Array<unknown>>};

export type CategoryCompatibilitySchema = {kind?: 'category_compatibility' | undefined, feature: string, other: string, allowed: Array<Array<unknown>>};

export type StructuralConstraintSchema = CategoryHierarchySchema | CategoryCompatibilitySchema;

export type ScenarioRequest = {dataframe: WorkspaceQuery, target_value: number, search?: ScenarioSearch | undefined, constraints?: {[key: string]: FeatureConstraintSchema} | undefined, numeric_quantiles?: Array<unknown> | undefined, structural_constraints?: Array<StructuralConstraintSchema> | undefined};

export type CreateApiV1ModelsModelIdScenarioArgs = {model_id: string, body: ScenarioRequest};

export type CreateApiV1ModelsModelIdScenarioOptions = {baseUrl: string, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const iD = z.union([z.string(), z.string()]);

export const jobStatus = z.enum(["pending", "running", "completed", "failed", "cancelled"]);

export const jobSubmissionResponse = z.object({job_id: iD, status: jobStatus, message: z.string()});

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
};

/**
 * Scenario
 * 
 * POST /v1/models/{model_id}/scenario
 */
export const createApiV1ModelsModelIdScenario = async (args: CreateApiV1ModelsModelIdScenarioArgs, options: CreateApiV1ModelsModelIdScenarioOptions) => {
const {baseUrl, fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/models/${encodeURIComponent(String(args.model_id))}/scenario${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(jobSubmissionResponse, await res.json())
};