import {z} from 'zod'

export type GetApiEmailTemplatesEmailKeySchemaArgs = {emailKey: string};

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

export const modularEmailTemplateBlockType = z.enum(["HEADER", "TEXT", "CARD", "ORDER_SUMMARY", "PRODUCTS", "REFERRAL"]);

export const schemaFieldType = z.enum(["PLAINTEXT", "HTML", "URL", "CDN_URL", "PRODUCT_IDS", "FIELD_COLLECTION"]);

export const htmlFormattingFeature = z.enum(["IMAGE", "LAYOUT", "LINK", "LIST", "SWIPER", "VIDEO_EMBED", "TEXT_STRUCTURE", "TEXT_STYLE", "STYLE"]);

export const schemaField: z.ZodType<SchemaField> = z.object({type: schemaFieldType, property: z.string(), description: z.string(), hint: z.string(), isRequired: z.boolean(), placeholderVariables: z.array(z.string()), allowedFormattingFeatures: htmlFormattingFeature, allowedFileTypes: z.array(z.string()), fields: z.array(z.lazy(() => schemaField))});

export const blockSchema = z.object({type: modularEmailTemplateBlockType, description: z.string(), hint: z.string(), limit: z.number().int(), isRequired: z.boolean(), isFirst: z.boolean(), fields: z.array(schemaField)});

export const getApiEmailTemplatesEmailKeySchemaResponse = z.array(blockSchema);

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
};

/**
 * GET /email-templates/{emailKey}/schema
 */
export const getApiEmailTemplatesEmailKeySchema = async (args: GetApiEmailTemplatesEmailKeySchemaArgs, options: GetApiEmailTemplatesEmailKeySchemaOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/email-templates/${encodeURIComponent(String(args.emailKey))}/schema${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(getApiEmailTemplatesEmailKeySchemaResponse, await res.json())
};