import {z} from 'zod'

export type SolutionInfo = {state_id: number, solution_index: number, name?: (string | null) | undefined};

export type IntermediateSolutionRequest = {problem_id: number, session_id?: (number | null) | undefined, parent_state_id?: (number | null) | undefined, context?: (string | null) | undefined, scalarization_options?: ({[key: string]: number | string | boolean} | null) | undefined, solver?: (string | null) | undefined, solver_options?: ({[key: string]: number | string | boolean} | null) | undefined, num_desired?: (number | null) | undefined, reference_solution_1: SolutionInfo, reference_solution_2: SolutionInfo};

export type CreateApiMethodGenericIntermediateArgs = {body: IntermediateSolutionRequest};

export type CreateApiMethodGenericIntermediateOptions = {baseUrl: string, OAuth2PasswordBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const tensor: z.ZodType<Tensor> = z.union([z.array(z.lazy(() => tensor)), z.array(z.union([z.number(), z.number().int(), z.boolean()])), z.number(), z.number().int(), z.boolean(), z.literal("List")]).nullable();

export const solutionReferenceResponse = z.object({name: z.string().nullable(), solution_index: z.number().int().nullable(), state_id: z.number().int(), objective_values: z.record(z.string(), z.number()).nullable(), variable_values: z.record(z.string(), z.union([z.number(), z.number().int(), z.boolean(), tensor])).nullable()});

export const genericIntermediateSolutionResponse = z.object({state_id: z.number().int().nullable(), reference_solution_1: solutionReferenceResponse, reference_solution_2: solutionReferenceResponse, intermediate_solutions: z.array(solutionReferenceResponse)});

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
};

/**
 * Solve Intermediate
 * 
 * POST /method/generic/intermediate
 * 
 * Also accepts auth: APIKeyCookie
 */
export const createApiMethodGenericIntermediate = async (args: CreateApiMethodGenericIntermediateArgs, options: CreateApiMethodGenericIntermediateOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2PasswordBearer} = options ?? {}

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

if (OAuth2PasswordBearer !== undefined) headers.set('authorization', `Bearer ${OAuth2PasswordBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/method/generic/intermediate${query.size > 0 ? `?${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(genericIntermediateSolutionResponse, await res.json())
};