import { downloadFile, request } from '../lib/apiClient'

/* ============================================================
   reports.js — the saved report library, backend/reports/app.py.

   A saved report is a parameterisation of a governed analytics query
   (report_type + filters), never free-form SQL. Runs return one tabular
   envelope — {columns:[{key,label}], rows:[{...}]} — so a single DataTable
   renders every type, and /reports/export streams the same table as CSV.

   Filters prefer `window_days` (rolling) over fixed from/to dates: a saved
   "last 90 days" report should mean the last 90 days on every run.
   Permissions: reports.view to list/run, reports.create / .edit / .delete
   to manage, reports.export to download CSV.
   ============================================================ */

export const REPORT_TYPES = [
  { key: 'kpis', label: 'KPI Summary' },
  { key: 'funnel', label: 'Hiring Funnel' },
  { key: 'hiring_trend', label: 'Hiring Trend' },
  { key: 'source_performance', label: 'Source Performance' },
  { key: 'recruiter_performance', label: 'Recruiter Performance' },
  { key: 'department_performance', label: 'Department Performance' },
]

export function list() {
  return request('/reports/fetch')
}

export function create({ name, reportType, description, filters } = {}) {
  return request('/reports/create', {
    method: 'POST',
    body: { name, report_type: reportType, description, filters },
  })
}

export function update(recordId, body) {
  return request('/reports/update', {
    method: 'PATCH',
    params: { record_id: recordId },
    body,
  })
}

export function remove(recordId) {
  return request('/reports/delete', {
    method: 'DELETE',
    params: { record_id: recordId },
  })
}

/** Run a saved report (recordId) or an ad-hoc definition (reportType + filters). */
export function run({ recordId, reportType, filters } = {}) {
  return request('/reports/run', {
    method: 'POST',
    body: { record_id: recordId, report_type: reportType, filters },
  })
}

export function runs(recordId) {
  return request('/reports/runs/fetch', { params: { record_id: recordId } })
}

/** CSV download via Content-Disposition; the browser save is handled by downloadFile. */
export function exportCsv({ recordId, reportType, filters } = {}) {
  const f = filters || {}
  return downloadFile('/reports/export', {
    params: {
      record_id: recordId,
      report_type: reportType,
      from_date: f.from_date,
      to_date: f.to_date,
      window_days: f.window_days,
      department: f.department,
      recruiter_id: f.recruiter_id,
      months: f.months,
      top: f.top,
    },
  })
}