import {z} from 'zod'

export type ComputationGraphInput = {module: string, qualname: string, serialized_value: string, name: string};

export type PythonVersion = '3.12' | '3.13' | '3.14';

export type GraphInputArgument = {kind?: 'graph_input' | undefined, input_name: string};

export type SerializableValue = {module: string, qualname: string, serialized_value: string, kind?: 'serialized' | undefined};

export type JsonValue = unknown;

export type LiteralValue = {kind?: 'literal' | undefined, value: JsonValue};

export type ComputationNodeOutputArgument = {kind?: 'node_output' | undefined, node_key: string, output_name?: 'result' | undefined};

export type ComputationGraphArgument = GraphInputArgument | SerializableValue | LiteralValue | ComputationNodeOutputArgument;

export type ComputationGraphArguments = {positional?: Array<ComputationGraphArgument> | undefined, keyword?: {[key: string]: ComputationGraphArgument} | undefined};

export type Environment = {python_version?: PythonVersion | undefined, pypi_dependencies?: Array<string> | undefined, environment_variables?: {[key: string]: string} | undefined};

export type Resources = {cpu?: (number | null) | undefined, memory_mib?: (number | null) | undefined, gpu?: (string | null) | undefined, timeout_seconds?: number | undefined};

export type ComputationGraphNode = {kind?: 'python' | undefined, key: string, node_type?: string | undefined, serialized_function: string, serialization_python_version: PythonVersion, arguments?: ComputationGraphArguments | undefined, environment: Environment, resources?: Resources | undefined, depends_on?: Array<string> | undefined};

export type PlatformOperation = 'training.initialize' | 'training.fit' | 'training.prepare_trial' | 'training.reduce' | 'training.publish';

export type PlatformComputationGraphNode = {kind?: 'platform' | undefined, key: string, operation: PlatformOperation, arguments?: ComputationGraphArguments | undefined, depends_on?: Array<string> | undefined};

export type ComputationGraphNodeSpec = ComputationGraphNode | PlatformComputationGraphNode;

export type ComputationGraphOutput = {name: string, node_key: string, output_name?: 'result' | undefined};

export type ComputationGraphSpec = {inputs?: Array<ComputationGraphInput> | undefined, nodes: Array<ComputationGraphNodeSpec>, outputs: Array<ComputationGraphOutput>};

export type ComputationGraphDefinition = {kind?: 'computation_graph' | undefined, graph: ComputationGraphSpec};

export type ID = string | string;

export type ReasoningDefinition = {kind?: 'reasoning' | undefined, model_id: ID, random_state?: number | undefined};

export type JobDefinition = ComputationGraphDefinition | ReasoningDefinition;

export type CreateJobRequest = {definition: JobDefinition};

export type CreateApiV1JobsArgs = {body: CreateJobRequest};

export type CreateApiV1JobsOptions = {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
};

/**
 * Create Job
 * 
 * POST /v1/jobs
 */
export const createApiV1Jobs = async (args: CreateApiV1JobsArgs, options: CreateApiV1JobsOptions) => {
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/jobs${query.size > 0 ? `?${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())
};