import {z} from 'zod'

export type ChartSpec = {enabled?: boolean | undefined};

export type AlertLevel = 'ok' | 'warning' | 'critical' | 'no_data';

export type SeverityFilter = {levels?: Array<AlertLevel> | undefined};

export type ContentField = {label?: string | undefined, show_when?: (SeverityFilter | null) | undefined, value?: string | undefined};

export type ContentLink = {label?: string | undefined, show_when?: (SeverityFilter | null) | undefined, url?: string | undefined};

export type RowsSpec = {columns?: (Array<string> | null) | undefined, enabled?: boolean | undefined, format?: (string | null) | undefined, max?: number | undefined};

export type ContentSpec = {body?: string | undefined, chart?: ChartSpec | undefined, fields?: Array<ContentField> | undefined, links?: Array<ContentLink> | undefined, rows?: RowsSpec | undefined, title?: string | undefined, title_overrides?: {[key: string]: string} | undefined};

export type NotificationKind = 'alert' | 'incident' | 'anomaly' | 'synthetics' | 'downtime' | 'on_call';

export type CreateApiApiOrgIdAlertsTemplatesPreviewArgs = {org_id: string, body: {channel: string, definition: ContentSpec, kind?: NotificationKind | undefined, sample: unknown, severity?: (string | null) | undefined}};

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

export const previewKv = z.object({label: z.string(), value: z.string()});

export const previewLink = z.object({label: z.string(), url: z.string()});

export const previewModel = z.object({body_html: z.string(), chart_placeholder: z.boolean(), color: z.string(), fields: z.array(previewKv), footer: z.string(), links: z.array(previewLink), severity: z.string().nullable().optional(), title: z.string()});

export const variableGroup = z.object({name: z.string(), variables: z.array(z.string())});

export const templatePreviewResponse = z.object({empty_variables: z.array(z.string()), payload: z.unknown(), preview_model: previewModel, unknown_variables: z.array(z.string()), variable_groups: z.array(variableGroup), variables: z.array(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
};

/**
 * Preview an alert template
 * 
 * POST /api/{org_id}/alerts/templates/preview
 */
export const createApiApiOrgIdAlertsTemplatesPreview = async (args: CreateApiApiOrgIdAlertsTemplatesPreviewArgs, options: CreateApiApiOrgIdAlertsTemplatesPreviewOptions) => {
const {baseUrl, fetch: fetchFn = fetch, Authorization} = options ?? {}

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

if (Authorization !== undefined) headers.set("Authorization", Authorization)

const url = `${baseUrl.replace(/\/+$/, '')}/api/${encodeURIComponent(String(args.org_id))}/alerts/templates/preview${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(templatePreviewResponse, await res.json())
};