import {z} from 'zod'

export type RestVariable = {name?: string | undefined, type?: string | undefined, value?: Record<string, never> | undefined, valueUrl?: string | undefined, scope?: string | undefined};

export type CaseInstanceCreateRequest = {caseDefinitionId?: string | undefined, caseDefinitionKey?: string | undefined, name?: string | undefined, businessKey?: string | undefined, variables?: Array<RestVariable> | undefined, transientVariables?: Array<RestVariable> | undefined, startFormVariables?: Array<RestVariable> | undefined, outcome?: string | undefined, tenantId?: string | undefined, overrideDefinitionTenantId?: string | undefined, returnVariables?: boolean | undefined};

export type CreateApiCmmnRuntimeCaseInstancesArgs = {body: CaseInstanceCreateRequest};

export type CreateApiCmmnRuntimeCaseInstancesOptions = {baseUrl: string, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const restVariable = z.object({name: z.string().optional(), type: z.string().optional(), value: z.object({}).optional(), valueUrl: z.string().optional(), scope: z.string().optional()});

export const caseInstanceResponse = z.object({id: z.string().optional(), name: z.string().optional(), url: z.string().optional(), businessKey: z.string().optional(), businessStatus: z.string().optional(), dueDate: z.string().optional(), claimTime: z.string().optional(), claimedBy: z.string().optional(), startTime: z.string().optional(), startUserId: z.string().optional(), state: z.string().optional(), ended: z.boolean().optional(), caseDefinitionId: z.string().optional(), caseDefinitionUrl: z.string().optional(), caseDefinitionName: z.string().optional(), caseDefinitionDescription: z.string().optional(), parentId: z.string().optional(), callbackId: z.string().optional(), callbackType: z.string().optional(), referenceId: z.string().optional(), referenceType: z.string().optional(), variables: z.array(restVariable).optional(), tenantId: z.string().optional(), completed: z.boolean().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
};

/**
 * Start a case instance
 * 
 * POST /cmmn-runtime/case-instances
 */
export const createApiCmmnRuntimeCaseInstances = async (args: CreateApiCmmnRuntimeCaseInstancesArgs, options: CreateApiCmmnRuntimeCaseInstancesOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/cmmn-runtime/case-instances${query.size > 0 ? `?${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(caseInstanceResponse, await res.json())
};