import {z} from 'zod'

export type JIRAStatusCategory = 'To Do' | 'In Progress' | 'Done' | 'No Category';

export type JIRAFilter = {epics?: Array<string> | undefined, labels_include?: Array<string> | undefined, labels_exclude?: Array<string> | undefined, issue_types?: Array<string> | undefined, priorities?: Array<string> | undefined, projects?: Array<string> | undefined, status_categories?: Array<JIRAStatusCategory> | undefined, unmapped?: boolean | undefined};

export type TimeZone = number;

export type JIRAFilterWith = {assignees?: (Array<string | null>) | undefined, reporters?: Array<string> | undefined, commenters?: Array<string> | undefined};

export type JIRAMetricID = 'jira-open' | 'jira-resolved' | 'jira-raised' | 'jira-acknowledged' | 'jira-acknowledged-q' | 'jira-life-time' | 'jira-life-time-below-threshold-ratio' | 'jira-lead-time' | 'jira-lead-time-below-threshold-ratio' | 'jira-acknowledge-time' | 'jira-acknowledge-time-below-threshold-ratio' | 'jira-pr-lag-time' | 'jira-backlog-time' | 'jira-resolution-rate';

export type Quantiles = Array<number>;

export type Granularity = string;

export type Granularities = Array<Granularity>;

export type JIRAMetricsRequest = {account: number, date_from: string, date_to: string, for?: Array<JIRAFilter> | undefined, timezone?: TimeZone | undefined, priorities?: Array<string> | undefined, types?: Array<string> | undefined, labels_include?: Array<string> | undefined, labels_exclude?: Array<string> | undefined, exclude_inactive: boolean, epics?: Array<string> | undefined, with?: Array<JIRAFilterWith> | undefined, projects?: Array<string> | undefined, metrics: Array<JIRAMetricID>, quantiles?: Quantiles | undefined, granularities: Granularities, group_by_jira_label?: boolean | undefined};

export type CreateApiMetricsJiraArgs = {body: JIRAMetricsRequest};

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

export const granularity = z.string();

export const jIRAStatusCategory = z.enum(["To Do", "In Progress", "Done", "No Category"]);

export const jIRAFilter = z.object({epics: z.array(z.string()).optional(), labels_include: z.array(z.string()).optional(), labels_exclude: z.array(z.string()).optional(), issue_types: z.array(z.string()).optional(), priorities: z.array(z.string()).optional(), projects: z.array(z.string()).optional(), status_categories: z.array(jIRAStatusCategory).optional(), unmapped: z.boolean().optional()});

export const jIRAFilterWith = z.object({assignees: z.array(z.string().nullable()).optional(), reporters: z.array(z.string()).optional(), commenters: z.array(z.string()).optional()});

export const timeDuration = z.string();

export const calculatedLinearMetricValues = z.object({date: z.string(), values: z.array(z.union([z.number(), timeDuration, z.object({})])), confidence_mins: z.array(z.union([z.number().nullable(), timeDuration])).optional(), confidence_maxs: z.array(z.union([z.number().nullable(), timeDuration])).optional(), confidence_scores: z.array(z.number().int().nullable()).optional()});

export const calculatedJIRAMetricValues = z.object({granularity: granularity, for: jIRAFilter.optional(), jira_label: z.string().optional(), with: jIRAFilterWith.optional(), values: z.array(calculatedLinearMetricValues)});

export const calculatedJIRAMetrics = z.array(calculatedJIRAMetricValues);

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
};

/**
 * Calculate metrics over JIRA issue activities.
 * 
 * POST /metrics/jira
 * 
 * Also accepts auth: apiKeyAuth
 */
export const createApiMetricsJira = async (args: CreateApiMetricsJiraArgs, options: CreateApiMetricsJiraOptions) => {
const {baseUrl, fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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