// PBI-74 / T-846: dev-only schaduw-store fingerprint verifyer.
// Logt counts van oude (useBacklogStore) en nieuwe (useProductWorkspaceStore)
// na elke hydratie- of realtime-event. Bij mismatch verschijnt er een
// console.warn zodat we tijdens Story 2 in dev-tools zien dat beide stores
// dezelfde inhoud houden.
//
// TODO(PBI-74 / Story 8 / T-878): verwijder dit bestand en alle aanroepen
// vóór merge van de cleanup-PR.

import { useBacklogStore } from '@/stores/backlog-store'
import { useProductWorkspaceStore } from '@/stores/product-workspace/store'

interface Fingerprint {
  pbis: number
  storiesByPbi: Record<string, number>
  tasksByStory: Record<string, number>
}

function fingerprintOld(): Fingerprint {
  const s = useBacklogStore.getState()
  const storiesByPbi: Record<string, number> = {}
  for (const [pbiId, list] of Object.entries(s.storiesByPbi)) {
    storiesByPbi[pbiId] = list.length
  }
  const tasksByStory: Record<string, number> = {}
  for (const [storyId, list] of Object.entries(s.tasksByStory)) {
    tasksByStory[storyId] = list.length
  }
  return { pbis: s.pbis.length, storiesByPbi, tasksByStory }
}

function fingerprintNew(): Fingerprint {
  const s = useProductWorkspaceStore.getState()
  const storiesByPbi: Record<string, number> = {}
  for (const [pbiId, ids] of Object.entries(s.relations.storyIdsByPbi)) {
    storiesByPbi[pbiId] = ids.length
  }
  const tasksByStory: Record<string, number> = {}
  for (const [storyId, ids] of Object.entries(s.relations.taskIdsByStory)) {
    tasksByStory[storyId] = ids.length
  }
  return { pbis: s.relations.pbiIds.length, storiesByPbi, tasksByStory }
}

function shapeEqual(a: Record<string, number>, b: Record<string, number>): boolean {
  const keys = new Set([...Object.keys(a), ...Object.keys(b)])
  for (const k of keys) {
    if ((a[k] ?? 0) !== (b[k] ?? 0)) return false
  }
  return true
}

export function logWorkspaceFingerprint(label: string): void {
  if (process.env.NODE_ENV === 'production') return

  const oldFp = fingerprintOld()
  const newFp = fingerprintNew()
  const match =
    oldFp.pbis === newFp.pbis &&
    shapeEqual(oldFp.storiesByPbi, newFp.storiesByPbi) &&
    shapeEqual(oldFp.tasksByStory, newFp.tasksByStory)

  if (!match) {
    console.warn(
      `[workspace-fingerprint:${label}] MISMATCH oud↔nieuw`,
      { old: oldFp, new: newFp },
    )
  } else if (process.env.NEXT_PUBLIC_DEBUG_WORKSPACE_FINGERPRINT === '1') {
    console.debug(`[workspace-fingerprint:${label}] match`, oldFp)
  }
}