import {z} from 'zod'

export type GetApiReportsArgs = {from?: string | undefined, to?: string | undefined, timeZone?: string | undefined};

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

export const operationsReport = z.object({timeZone: z.string(), from: z.string(), to: z.string(), generatedAt: z.string(), screenings: z.object({total: z.number().int().gte(0), potentialMatches: z.number().int().gte(0), noMatches: z.number().int().gte(0), expired: z.number().int().gte(0)}), cases: z.object({open: z.number().int().gte(0), confirmed: z.number().int().gte(0), dismissed: z.number().int().gte(0), overdue: z.number().int().gte(0), pendingApproval: z.number().int().gte(0), unassigned: z.number().int().gte(0)}), monitoring: z.object({active: z.number().int().gte(0), paused: z.number().int().gte(0), overdue: z.number().int().gte(0), failed: z.number().int().gte(0), unread: z.number().int().gte(0)}), reviews: z.object({total: z.number().int().gte(0), reused: z.number().int().gte(0), medianHours: z.number().nullable()}), reviewers: z.array(z.object({actorId: z.string(), actorEmail: z.string().optional(), decisions: z.number().int().gte(0)})), sourceCoverage: z.array(z.object({sourceId: z.string(), screenings: z.number().int().gte(0)})), expiringEvidence: z.array(z.object({screeningId: z.string(), expiresAt: z.string(), caseId: z.string().nullable()})), limitations: z.array(z.string())});

export const getApiReportsResponse = z.object({data: operationsReport});

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
};

/**
 * Read current backlog and period screening and reviewer activity
 * 
 * GET /reports
 */
export const getApiReports = async (args: GetApiReportsArgs, options: GetApiReportsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, bearerAuth} = 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))
if (args.timeZone != null) query.append("timeZone", String(args.timeZone))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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