import { ref } from 'vue'
import { useApi } from '~/composables/useApi'

export type PieceHistoryActor = {
  id: string
  label: string
}

export type PieceHistoryEntry = {
  id: string
  action: 'create' | 'update' | 'delete' | string
  createdAt: string
  actor: PieceHistoryActor | null
  diff: Record<string, { from: unknown; to: unknown }> | null
  snapshot: Record<string, unknown> | null
}

const extractItems = (payload: any): PieceHistoryEntry[] => {
  if (Array.isArray(payload?.items)) {
    return payload.items
  }
  if (Array.isArray(payload?.member)) {
    return payload.member
  }
  if (Array.isArray(payload?.['hydra:member'])) {
    return payload['hydra:member']
  }
  return []
}

export function usePieceHistory () {
  const { get } = useApi()

  const history = ref<PieceHistoryEntry[]>([])
  const loading = ref(false)
  const error = ref<string | null>(null)

  const loadHistory = async (pieceId: string) => {
    loading.value = true
    error.value = null
    try {
      const result = await get(`/pieces/${pieceId}/history`)
      if (!result.success) {
        error.value = result.error ?? 'Impossible de charger l’historique.'
        history.value = []
        return result
      }
      history.value = extractItems(result.data) as PieceHistoryEntry[]
      return { success: true, data: history.value }
    } catch (err: any) {
      const message = err?.message ?? 'Erreur inconnue'
      error.value = message
      history.value = []
      return { success: false, error: message }
    } finally {
      loading.value = false
    }
  }

  return {
    history,
    loading,
    error,
    loadHistory,
  }
}