import {z} from 'zod'

export type GetApiV1UsageSeriesArgs = {to?: string | undefined, from?: string | undefined, accountIds?: (Array<string> | null) | undefined, checkTypes?: (Array<'AGENTIC' | 'API' | 'BROWSER' | 'HEARTBEAT' | 'ICMP' | 'MULTI_STEP' | 'TCP' | 'PLAYWRIGHT' | 'URL' | 'DNS' | 'SSL' | 'GRPC' | 'TRACEROUTE'> | null) | undefined, interval?: ('total' | 'day' | 'week' | 'month') | undefined, groupBy?: ('account' | 'checkType' | 'account,checkType') | undefined, limit?: number | undefined, nextId?: string | undefined, 'x-checkly-account'?: string | undefined};

export type GetApiV1UsageSeriesOptions = {baseUrl?: string | undefined, Bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const usageV1SeriesPeriod = z.object({from: z.string(), to: z.string(), interval: z.enum(["total", "day", "week", "month"]), groupBy: z.enum(["account", "checkType", "account,checkType"])});

export const usageV1Credits = z.object({used: z.number().gte(0).nullable(), percentOfBudget: z.number().gte(0).nullable()});

export const usageV1CheckRunMeter = z.object({meterType: z.literal("CHECK_RUN"), measures: z.object({totalRuns: z.number().int().gte(0), finalRuns: z.number().int().gte(0), retryRuns: z.number().int().gte(0), cancelledRuns: z.number().int().gte(0), multiStepRequests: z.number().int().gte(0), playwrightBillableDurationMs: z.number().int().gte(0), degradedRuns: z.number().int().gte(0), failedRuns: z.number().int().gte(0), errorRuns: z.number().int().gte(0), abortedRuns: z.number().int().gte(0), overMaxResponseTimeRuns: z.number().int().gte(0), standardBillableUnits: z.number().int().gte(0), premiumBillableUnits: z.number().int().gte(0)})});

export const usageV1AiInvocationMeter = z.object({meterType: z.literal("AI_INVOCATION"), measures: z.object({invocations: z.number().int().gte(0), durationMs: z.number().int().gte(0)})});

export const usageV1Meter = z.discriminatedUnion("meterType", [usageV1CheckRunMeter, usageV1AiInvocationMeter]);

export const usageV1Row = z.object({credits: usageV1Credits, meters: z.array(usageV1Meter), periodStart: z.string(), periodEnd: z.string(), accountId: z.string().optional(), checkType: z.enum(["AGENTIC", "API", "BROWSER", "HEARTBEAT", "ICMP", "MULTI_STEP", "TCP", "PLAYWRIGHT", "URL", "DNS", "SSL", "GRPC", "TRACEROUTE"]).optional()});

export const usageV1SeriesResponse = z.object({usageTermsId: z.string().nullable(), period: usageV1SeriesPeriod, data: z.array(usageV1Row), length: z.number().int().gte(0), nextId: z.string().nullable()});

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 paginated usage data grouped over time.
 * 
 * GET /v1/usage/series
 */
export const getApiV1UsageSeries = async (args: GetApiV1UsageSeriesArgs, options?: GetApiV1UsageSeriesOptions) => {
const {baseUrl = "https://api.checklyhq.com", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (args.to != null) query.append("to", String(args.to))
if (args.from != null) query.append("from", String(args.from))
for (const item of args.accountIds ?? []) query.append("accountIds", String(item))
for (const item of args.checkTypes ?? []) query.append("checkTypes", String(item))
if (args.interval != null) query.append("interval", String(args.interval))
if (args.groupBy != null) query.append("groupBy", String(args.groupBy))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.nextId != null) query.append("nextId", String(args.nextId))
if (args['x-checkly-account'] != null) headers.set("x-checkly-account", String(args['x-checkly-account']))
if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/usage/series${query.size > 0 ? `?${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(usageV1SeriesResponse, await res.json())
};