import {z} from 'zod'

export type CreateApiV1ValidateDslArgs = {body: {hostApp?: string | undefined, debug?: boolean | undefined, dslDocument: {[key: string]: unknown}}};

export type CreateApiV1ValidateDslOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const requestSummary = z.object({method: z.string(), uri: z.string(), path: z.string(), host: z.string()});

export const validationErrorEntry = z.object({path: z.string(), message: z.string(), keyword: z.string(), source: z.string(), suggestion: z.string().nullable(), candidates: z.array(z.string()).optional()});

export const validateDslResult = z.object({kind: z.literal("dsl"), hostApp: z.string(), ok: z.boolean(), validatorEngine: z.string(), diagnostics: z.object({schemaErrorCount: z.number().int().gte(0), guardErrorCount: z.number().int().gte(0), warningCount: z.number().int().gte(0)}), summary: z.string(), suggestions: z.array(z.string()), debug: z.object({}).nullable(), errorCount: z.number().int().gte(0), errors: z.array(validationErrorEntry), warningCount: z.number().int().gte(0), warnings: z.array(validationErrorEntry)});

export const validateDslResponse = z.object({service: z.string(), status: z.literal("ok"), timestampUtc: z.string(), message: z.string(), request: requestSummary, validation: validateDslResult}).and(z.record(z.string(), z.unknown()));

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
};

/**
 * Validate an Automation Agent for Premiere Pro DSL document
 * 
 * POST /v1/validate/dsl
 */
export const createApiV1ValidateDsl = async (args: CreateApiV1ValidateDslArgs, options?: CreateApiV1ValidateDslOptions) => {
const {baseUrl = "https://api.mamoworld.com", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/validate/dsl${query.size > 0 ? `?${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(validateDslResponse, await res.json())
};