import {z} from 'zod'

export type AtlasExpressionType = 'composite' | 'index' | 'grayscale';

export type AtlasIndexCreateRequest = {name: string, description: string, rescale: Array<number>, expression: string, colormap: string, satellite_id: string, expression_type: AtlasExpressionType};

export type CreateApiV0IndicesArgs = {body: AtlasIndexCreateRequest};

export type CreateApiV0IndicesOptions = {baseUrl?: string | undefined, ApiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const atlasExpressionType = z.enum(["composite", "index", "grayscale"]);

export const atlasIndexType = z.enum(["custom", "preset"]);

export const atlasIndexCreateResponse = z.object({bands: z.array(z.string()).optional(), colormap: z.string().optional(), created_at: z.string().optional(), description: z.string().optional(), expression: z.string().optional(), expression_type: atlasExpressionType.optional(), id: z.string().optional(), name: z.string().optional(), rescale: z.array(z.number().int()).optional(), satellite_id: z.string().optional(), type: atlasIndexType.optional(), updated_at: z.string().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
};

/**
 * Create a new index
 * 
 * POST /v0/indices
 */
export const createApiV0Indices = async (args: CreateApiV0IndicesArgs, options?: CreateApiV0IndicesOptions) => {
const {baseUrl = "https://api.pixxel.space", fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/v0/indices${query.size > 0 ? `?${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(atlasIndexCreateResponse, await res.json())
};