import {z} from 'zod'

export type GetApiTasksArgs = {pageSize?: number | undefined, sortOrder?: ('asc' | 'desc') | undefined, pageCursor?: string | undefined, sortField?: ('createdAt' | 'dueDate') | undefined, filterStatus?: ('pending' | 'completed') | undefined, filterEmployeeId?: number | undefined, filterJobId?: number | undefined, filterDueDateFrom?: string | undefined, filterDueDateTo?: string | undefined, filterOverdue?: boolean | undefined};

export type GetApiTasksOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const links = z.object({href: z.string(), rel: z.string(), type: z.enum(["GET", "POST", "PUT", "PATCH"])});

export const task = z.object({id: z.number(), description: z.string(), dueDate: z.string().nullable(), jobId: z.number().nullable(), status: z.union([z.literal("pending"), z.literal("completed")]), createdById: z.number(), createdAt: z.string(), completedAt: z.string().nullable(), completedById: z.number().nullable(), assignedEmployeeIds: z.array(z.number()), links: z.array(links)});

export const pagination = z.object({perPage: z.number(), pageCount: z.number(), links: z.object({self: z.string(), previous: z.string().nullable(), next: z.string().nullable()})});

export const getTasksResponse = z.object({result: z.string(), data: z.array(task), paging: pagination.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
};

/**
 * List all tasks for the company with optional filters
 * 
 * GET /tasks
 * 
 * Also accepts auth: PersonalAccessToken
 */
export const getApiTasks = async (args: GetApiTasksArgs, options?: GetApiTasksOptions) => {
const {baseUrl = "https://api.fergus.com", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (args.pageSize != null) query.append("pageSize", String(args.pageSize))
if (args.sortOrder != null) query.append("sortOrder", String(args.sortOrder))
if (args.pageCursor != null) query.append("pageCursor", String(args.pageCursor))
if (args.sortField != null) query.append("sortField", String(args.sortField))
if (args.filterStatus != null) query.append("filterStatus", String(args.filterStatus))
if (args.filterEmployeeId != null) query.append("filterEmployeeId", String(args.filterEmployeeId))
if (args.filterJobId != null) query.append("filterJobId", String(args.filterJobId))
if (args.filterDueDateFrom != null) query.append("filterDueDateFrom", String(args.filterDueDateFrom))
if (args.filterDueDateTo != null) query.append("filterDueDateTo", String(args.filterDueDateTo))
if (args.filterOverdue != null) query.append("filterOverdue", String(args.filterOverdue))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

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