import {z} from 'zod'

export type GetApiApplicationsArgs = {status?: ('saved' | 'applied' | 'screening' | 'interview' | 'offer' | 'rejected') | undefined, tags?: Array<string> | undefined, includeArchived?: boolean | undefined};

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

export const getApiApplicationsResponse = z.array(z.object({id: z.string(), company: z.string().min(1), role: z.string().min(1), location: z.string().nullable(), salary: z.string().nullable(), status: z.enum(["saved", "applied", "screening", "interview", "offer", "rejected"]), archived: z.boolean(), resumeId: z.string().nullable(), source: z.string().nullable(), tags: z.array(z.string()), sourceUrl: z.string().nullable(), jobDescription: z.string().max(20000).nullable(), matchScore: z.number().int().gte(0).lte(100).nullable(), aiMetadata: z.record(z.string(), z.unknown()).nullable(), notes: z.string().nullable(), resumeFileUrl: z.string().nullable(), resumeFileName: z.string().nullable(), coverLetterUrl: z.string().nullable(), coverLetterName: z.string().nullable(), followUpAt: z.string().nullable(), followUpNote: z.string().nullable(), contacts: z.array(z.object({name: z.string().min(1), role: z.string().optional(), type: z.string().optional()})), activity: z.array(z.object({id: z.string().min(1), type: z.enum(["stage", "note", "created"]), text: z.string().min(1), at: z.string()})), appliedAt: z.string(), createdAt: z.string(), updatedAt: 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
};

/**
 * List job applications
 * 
 * GET /applications
 */
export const getApiApplications = async (args: GetApiApplicationsArgs, options?: GetApiApplicationsOptions) => {
const {baseUrl = "http://localhost:3000/api/openapi", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.status != null) query.append("status", String(args.status))
for (const item of args.tags ?? []) query.append("tags", String(item))
if (args.includeArchived != null) query.append("includeArchived", String(args.includeArchived))
if (apiKey !== undefined) headers.set("x-api-key", apiKey)

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