import {z} from 'zod'

export type SavingsEstimateRequest = {upload_id: string};

export type CreateApiV1OrgOrgIdSavingsEstimateArgs = {body: SavingsEstimateRequest};

export type CreateApiV1OrgOrgIdSavingsEstimateOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const extractionAssumption = z.object({field: z.string(), value: z.string(), reason: z.string(), services: z.array(z.string())});

export const extractionReport = z.object({period_basis: z.enum(["monthly", "annual", "source_period", "null"]).nullable().optional(), engine_version: z.string(), assumptions: z.array(extractionAssumption), gaps: z.array(z.record(z.string(), z.unknown())), readiness: z.record(z.string(), z.number().int())});

export const valueRange = z.object({estimate: z.number(), lower_bound: z.number().nullable(), upper_bound: z.number().nullable()});

export const costLineItem = z.object({service: z.string(), reservable_service: z.string().nullable(), service_code: z.string().nullable().optional(), resource_type: z.string().nullable(), usage_quantity: valueRange.nullable(), usage_unit: z.string().nullable(), cost: valueRange, region: z.string().nullable(), spend_type: z.enum(["on_demand", "reserved", "unreservable", "unknown"]), savings_estimate: valueRange.nullable()});

export const savingsEstimateDetail = z.object({provider: z.enum(["aws", "azure", "gcp", "anthropic", "openai", "null"]).nullable(), source_format: z.string(), period_start: z.string().nullable(), period_end: z.string().nullable(), account_id: z.string().nullable(), currency: z.string(), is_projected: z.boolean(), extraction_status: z.enum(["complete", "partial", "unverified"]), line_items: z.array(costLineItem), total_cost: valueRange, total_savings_estimate: valueRange});

export const savingsEstimate = z.object({extraction_report: extractionReport.nullable().optional(), id: z.string(), status: z.enum(["queued", "processing", "complete", "error"]), error: z.string().nullable().optional(), upload_id: z.string(), result: savingsEstimateDetail.nullable().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
};

/**
 * Estimate savings for an uploaded billing file
 * 
 * POST /v1/org/{org_id}/savings-estimate
 */
export const createApiV1OrgOrgIdSavingsEstimate = async (args: CreateApiV1OrgOrgIdSavingsEstimateArgs, options: CreateApiV1OrgOrgIdSavingsEstimateOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/org/${encodeURIComponent(String(args.org_id))}/savings-estimate${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(savingsEstimate, await res.json())
};