import {z} from 'zod'

export type GetApiV2UsageSummaryArgs = {from?: string | undefined, to?: string | undefined, usageTermsIds?: Array<string> | undefined, accountIds?: Array<string> | undefined, pricingRuleKeys?: (Array<'apiChecks' | 'multistepChecks' | 'browserChecks' | 'playwrightCheckSuites' | 'uptimeMonitors' | 'aiInvocations' | 'statusPages' | 'statusPageAdditionalServices' | 'statusPageAdditionalSubscribers' | 'additionalSms' | 'additionalPhoneAlerts'>) | undefined, 'x-checkly-account'?: string | undefined};

export type GetApiV2UsageSummaryOptions = {baseUrl?: string | undefined, Bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const usageV2PricingRule = z.union([z.object({method: z.literal("per_unit"), quantity: z.number().gt(0), unit: z.string().min(1), credits: z.number().gte(0), rates: z.array(z.object({when: z.string().min(1), credits: z.number().gte(0)})).optional(), included: z.object({quantity: z.number().gte(0), period: z.string().min(1).optional()}).optional()}), z.object({method: z.literal("per_period"), period: z.literal("day"), price: z.object({annualCredits: z.number().gte(0)})}), z.object({method: z.literal("capacity_blocks_per_period"), period: z.literal("day"), unit: z.string().min(1), included: z.object({quantity: z.number().gte(0)}), block: z.object({quantity: z.number().gt(0), annualCredits: z.number().gte(0)})})]);

export const usageV2Calculation = z.union([z.object({rateCondition: z.string().nullable(), measuredQuantity: z.number().gte(0), includedQuantity: z.number().gte(0).nullable(), billableQuantity: z.number().gte(0).nullable(), creditsUsed: z.number().gte(0).nullable()}), z.object({billableResourceDays: z.number().gte(0), appliedDailyCredits: z.number().gte(0), proration: z.object({daysPerYear: z.literal(365)}), creditsUsed: z.number().gte(0).nullable()}), z.object({scope: z.literal("statusPage"), measuredQuantity: z.number().gte(0), includedQuantity: z.number().gte(0), billableBlockDays: z.number().gte(0), appliedDailyCreditsPerBlock: z.number().gte(0), proration: z.object({daysPerYear: z.literal(365)}), creditsUsed: z.number().gte(0).nullable()})]);

export const usageV2Breakdown = z.object({usageTermsId: z.string(), pricingRuleKey: z.enum(["apiChecks", "multistepChecks", "browserChecks", "playwrightCheckSuites", "uptimeMonitors", "aiInvocations", "statusPages", "statusPageAdditionalServices", "statusPageAdditionalSubscribers", "additionalSms", "additionalPhoneAlerts"]), accountId: z.string().optional(), period: z.object({from: z.string(), to: z.string()}), pricingRule: usageV2PricingRule, calculations: z.array(usageV2Calculation), creditsUsed: z.number().gte(0).nullable()});

export const usageV2SummaryResponse = z.object({period: z.object({from: z.string(), to: z.string()}), usageTermsIds: z.array(z.string()), totals: z.object({creditsUsed: z.number().gte(0).nullable()}), breakdown: z.array(usageV2Breakdown), coverage: z.object({gaps: z.array(z.object({from: z.string(), to: 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
};

/**
 * Get usage summary
 * 
 * GET /v2/usage/summary
 */
export const getApiV2UsageSummary = async (args: GetApiV2UsageSummaryArgs, options?: GetApiV2UsageSummaryOptions) => {
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.from != null) query.append("from", String(args.from))
if (args.to != null) query.append("to", String(args.to))
for (const item of args.usageTermsIds ?? []) query.append("usageTermsIds", String(item))
for (const item of args.accountIds ?? []) query.append("accountIds", String(item))
for (const item of args.pricingRuleKeys ?? []) query.append("pricingRuleKeys", String(item))
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 = `${baseUrl.replace(/\/+$/, '')}/v2/usage/summary${query.size > 0 ? `?${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(usageV2SummaryResponse, await res.json())
};