import type { EmployerResponse, PersonResponse, Guid, AttestSummary } from './types'

async function apiGet<T>(path: string, signal?: AbortSignal): Promise<T> {
  const res = await fetch(path, { headers: { 'Accept': 'application/json' }, signal })
  if (!res.ok) {
    const text = await res.text().catch(() => '')
    throw new Error(`API GET ${path} failed: ${res.status} ${res.statusText} ${text}`)
  }
  return res.json() as Promise<T>
}

export const Api = {
  getPerson: (id: Guid, signal?: AbortSignal) => apiGet<PersonResponse>(`/api/v1/persons/${id}`, signal),
  listPersonAttests: (id: Guid, signal?: AbortSignal) => apiGet<AttestSummary[]>(`/api/v1/persons/${id}/attests`, signal),
  getEmployer: (id: Guid, signal?: AbortSignal) => apiGet<EmployerResponse>(`/api/v1/employers/${id}`, signal),
  listEmployerAttests: (id: Guid, signal?: AbortSignal) => apiGet<AttestSummary[]>(`/api/v1/employers/${id}/attests`, signal),
  personAttestDownloadUrl: (personId: Guid, attestId: Guid) => `/api/v1/persons/${personId}/attests/${attestId}/download`,
  employerAttestDownloadUrl: (employerId: Guid, attestId: Guid) => `/api/v1/employers/${employerId}/attests/${attestId}/download`,
  personAttestPreviewUrl: (personId: Guid, attestId: Guid) => `/api/v1/persons/${personId}/attests/${attestId}/download?inline=true`,
  employerAttestPreviewUrl: (employerId: Guid, attestId: Guid) => `/api/v1/employers/${employerId}/attests/${attestId}/download?inline=true`,
  uploadPersonAttest: async (
    personId: Guid,
    req: {
      title: string
      from: string // YYYY-MM-DD
      to: string   // YYYY-MM-DD
      summary?: string | null
      contentBase64: string
      contentType: string
    }
  ): Promise<{ attestId: Guid }> => {
    const body = {
      title: req.title,
      from: req.from,
      to: req.to,
      summary: req.summary ?? null,
      blobPath: '',
      blobHash: null,
      contentBase64: req.contentBase64,
      contentType: req.contentType,
    }
    const path = `/api/v1/persons/${personId}/attests`
    const res = await fetch(path, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', 'Accept': 'application/json' },
      body: JSON.stringify(body),
    })
    if (!res.ok) {
      const text = await res.text().catch(() => '')
      throw new Error(`API POST ${path} failed: ${res.status} ${res.statusText} ${text}`)
    }
    return res.json()
  },
  uploadEmployerAttest: async (
    employerId: Guid,
    req: {
      personId: Guid
      title: string
      from: string // YYYY-MM-DD
      to: string   // YYYY-MM-DD
      summary?: string | null
      contentBase64: string
      contentType: string
    }
  ): Promise<{ attestId: Guid }> => {
    const body = {
      personId: req.personId,
      title: req.title,
      from: req.from,
      to: req.to,
      summary: req.summary ?? null,
      blobPath: '',
      blobHash: null,
      contentBase64: req.contentBase64,
      contentType: req.contentType,
    }
    const path = `/api/v1/employers/${employerId}/attests`
    const res = await fetch(path, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', 'Accept': 'application/json' },
      body: JSON.stringify(body),
    })
    if (!res.ok) {
      const text = await res.text().catch(() => '')
      throw new Error(`API POST ${path} failed: ${res.status} ${res.statusText} ${text}`)
    }
    return res.json()
  },
}