import {z} from 'zod'

export type GetApiTilesCogStatisticsArgs = {data_path?: (string | null) | undefined, carbon_pool?: (string | null) | undefined, product_type?: (string | null) | undefined, product_variant?: (string | null) | undefined, resolution?: (number | null) | undefined, year?: (number | null) | undefined, analysis_completed_at?: (string | null) | undefined, url?: (string | null) | undefined, bidx?: (Array<number> | null) | undefined, expression?: (string | null) | undefined, nodata?: (number | number | string | null) | undefined, unscale?: (boolean | null) | undefined, resampling?: ('nearest' | 'bilinear' | 'cubic' | 'cubic_spline' | 'lanczos' | 'average' | 'mode' | 'gauss' | 'rms' | null) | undefined, reproject?: ('nearest' | 'bilinear' | 'cubic' | 'cubic_spline' | 'lanczos' | 'average' | 'mode' | 'sum' | 'rms' | null) | undefined, max_size?: number | undefined, height?: (number | null) | undefined, width?: (number | null) | undefined, algorithm?: ('hillshade' | 'contours' | 'normalizedIndex' | 'terrarium' | 'terrainrgb') | undefined, algorithm_params?: (string | null) | undefined, categorical?: (boolean | null) | undefined, c?: (Array<number | number> | null) | undefined, p?: (Array<number> | null) | undefined, histogram_bins?: (string | null) | undefined, histogram_range?: (string | null) | undefined};

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

export const bandStatistics = z.object({min: z.number(), max: z.number(), mean: z.number(), count: z.number(), sum: z.number(), std: z.number(), median: z.number(), majority: z.number(), minority: z.number(), unique: z.number(), histogram: z.array(z.array(z.union([z.number(), z.number().int()]))), valid_percent: z.number(), masked_pixels: z.number(), valid_pixels: z.number()}).and(z.record(z.string(), z.unknown()));

export const getApiTilesCogStatisticsResponse = z.record(z.string(), bandStatistics);

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
};

/**
 * Statistics
 * 
 * GET /tiles/cog/statistics
 */
export const getApiTilesCogStatistics = async (args: GetApiTilesCogStatisticsArgs, options: GetApiTilesCogStatisticsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyQuery} = options ?? {}

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

if (args.data_path != null) query.append("data_path", String(args.data_path))
if (args.carbon_pool != null) query.append("carbon_pool", String(args.carbon_pool))
if (args.product_type != null) query.append("product_type", String(args.product_type))
if (args.product_variant != null) query.append("product_variant", String(args.product_variant))
if (args.resolution != null) query.append("resolution", String(args.resolution))
if (args.year != null) query.append("year", String(args.year))
if (args.analysis_completed_at != null) query.append("analysis_completed_at", String(args.analysis_completed_at))
if (args.url != null) query.append("url", String(args.url))
for (const item of args.bidx ?? []) query.append("bidx", String(item))
if (args.expression != null) query.append("expression", String(args.expression))
if (args.nodata != null) query.append("nodata", String(args.nodata))
if (args.unscale != null) query.append("unscale", String(args.unscale))
if (args.resampling != null) query.append("resampling", String(args.resampling))
if (args.reproject != null) query.append("reproject", String(args.reproject))
if (args.max_size != null) query.append("max_size", String(args.max_size))
if (args.height != null) query.append("height", String(args.height))
if (args.width != null) query.append("width", String(args.width))
if (args.algorithm != null) query.append("algorithm", String(args.algorithm))
if (args.algorithm_params != null) query.append("algorithm_params", String(args.algorithm_params))
if (args.categorical != null) query.append("categorical", String(args.categorical))
for (const item of args.c ?? []) query.append("c", String(item))
for (const item of args.p ?? []) query.append("p", String(item))
if (args.histogram_bins != null) query.append("histogram_bins", String(args.histogram_bins))
if (args.histogram_range != null) query.append("histogram_range", String(args.histogram_range))
if (APIKeyQuery !== undefined) query.set("access_token", APIKeyQuery)

const url = `${baseUrl.replace(/\/+$/, '')}/tiles/cog/statistics${query.size > 0 ? `?${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(getApiTilesCogStatisticsResponse, await res.json())
};