import {z} from 'zod'

export type TemplateValidationRequest = {Subject?: string | undefined, HtmlBody?: string | undefined, TextBody?: string | undefined, TestRenderModel?: Record<string, never> | undefined, InlineCssForHtmlTestRender?: boolean | undefined};

export type CreateApiTemplatesValidateArgs = {'X-Postmark-Server-Token': string, body: TemplateValidationRequest};

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

export const templateValidationError = z.object({Message: z.string().optional(), Line: z.number().int().optional(), CharacterPosition: z.number().int().optional()});

export const templateValidationResult = z.object({ContentIsValid: z.boolean().optional(), ValidationErrors: z.array(templateValidationError).optional(), RenderedContent: z.string().optional()});

export const templateValidationResponse = z.object({AllContentIsValid: z.boolean().optional(), TextBody: templateValidationResult.optional(), HtmlBody: templateValidationResult.optional(), Subject: templateValidationResult.optional(), SuggestedTemplateModel: z.object({}).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
};

/**
 * Test Template Content
 * 
 * POST /templates/validate
 */
export const createApiTemplatesValidate = async (args: CreateApiTemplatesValidateArgs, options: CreateApiTemplatesValidateOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args['X-Postmark-Server-Token'] != null) headers.set("X-Postmark-Server-Token", String(args['X-Postmark-Server-Token']))

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