import {z} from 'zod'

export type GetApiApiValidateArgs = {url: string};

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

export const validationChecks = z.object({fetchable: z.boolean(), is_xml: z.boolean(), svg_root: z.boolean(), namespace_correct: z.boolean(), version_1_2: z.boolean(), base_profile_tiny_ps: z.boolean(), has_viewbox: z.boolean(), viewbox_square: z.boolean(), has_title: z.boolean(), no_scripts: z.boolean(), no_external_refs: z.boolean(), no_image_elements: z.boolean(), no_embedded_bitmaps: z.boolean(), no_animations: z.boolean(), no_foreign_object: z.boolean(), file_size_ok: z.boolean()});

export const validationReport = z.object({valid: z.boolean(), url: z.string(), file_size_bytes: z.number().int().gte(0).optional(), file_size_kb: z.string().optional(), errors: z.array(z.string()), warnings: z.array(z.string()), checks: validationChecks, meta: z.record(z.string(), z.unknown()), spec: z.string(), tool: 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
};

/**
 * Validate a public SVG URL for BIMI readiness
 * 
 * GET /api/validate
 */
export const getApiApiValidate = async (args: GetApiApiValidateArgs, options?: GetApiApiValidateOptions) => {
const {baseUrl = "https://makebimi.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.url != null) query.append("url", String(args.url))

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