import {z} from 'zod'

export type ReferencePoint = {preference_type?: 'reference_point' | undefined, aspiration_levels: {[key: string]: number}};

export type RPMSolveRequest = {problem_id: number, session_id?: (number | null) | undefined, parent_state_id?: (number | null) | undefined, scalarization_options?: ({[key: string]: number | string | boolean} | null) | undefined, solver?: (string | null) | undefined, solver_options?: ({[key: string]: number | string | boolean} | null) | undefined, preference?: ReferencePoint | undefined};

export type CreateApiMethodRpmSolveArgs = {body: RPMSolveRequest};

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

export const referencePoint = z.object({preference_type: z.literal("reference_point").optional(), aspiration_levels: z.record(z.string(), z.number())});

export const solverResults = z.object({optimal_variables: z.record(z.string(), z.union([z.number().int(), z.number(), z.array(z.unknown())])), optimal_objectives: z.record(z.string(), z.union([z.number(), z.array(z.number())])), constraint_values: z.union([z.record(z.string(), z.union([z.number(), z.number().int(), z.array(z.number()), z.array(z.unknown())])), z.unknown()]).nullable().optional(), extra_func_values: z.record(z.string(), z.union([z.number(), z.array(z.number())])).nullable().optional(), scalarization_values: z.record(z.string(), z.union([z.number(), z.array(z.number())])).nullable().optional(), success: z.boolean(), message: z.string()});

export const rPMState = z.object({id: z.number().int().nullable().optional(), preferences: referencePoint, scalarization_options: z.record(z.string(), z.union([z.number(), z.string(), z.boolean()])).nullable().optional(), solver: z.string().nullable().optional(), solver_options: z.record(z.string(), z.union([z.number(), z.string(), z.boolean()])).nullable().optional(), solver_results: z.array(solverResults)});

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 Solutions
 * 
 * POST /method/rpm/solve
 * 
 * Also accepts auth: APIKeyCookie
 */
export const createApiMethodRpmSolve = async (args: CreateApiMethodRpmSolveArgs, options: CreateApiMethodRpmSolveOptions) => {
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/rpm/solve${query.size > 0 ? `?${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(rPMState, await res.json())
};