import { defineStore } from 'pinia'
import { ref } from 'vue'
import api from '../api/axios'

/**
 * Payload shape for creating a new expense via POST /expenses/
 */
export interface AddExpensePayload {
  asset_id: string
  organization_id?: number | null  // Auto-resolved by backend from asset if omitted
  category_id: number
  amount_net: number
  currency?: string
  date: string
  mileage_at_cost?: number | null
  description?: string | null
  data?: Record<string, any>
}

/**
 * Response shape from POST /expenses/
 */
export interface ExpenseResponse {
  status: string
  id: string
  asset_id: string
  cost_category: string
  amount_net: number
  date: string
}

export const useCostStore = defineStore('cost', () => {
  // ── State ──────────────────────────────────────────────────────────
  const isSubmitting = ref(false)
  const lastError = ref<string | null>(null)
  const lastSuccess = ref<ExpenseResponse | null>(null)

  // ── Actions ────────────────────────────────────────────────────────

  /**
   * Add a new expense (fuel, fee, or other cost) via POST /expenses/.
   * Used by SimpleFuelModal, ComplexExpenseModal, and the dashboard cost card.
   */
  async function addExpense(payload: AddExpensePayload): Promise<ExpenseResponse | null> {
    isSubmitting.value = true
    lastError.value = null
    lastSuccess.value = null

    try {
      // Build request body — omit organization_id if not provided (backend resolves it)
      const body: Record<string, any> = {
        asset_id: payload.asset_id,
        category_id: payload.category_id,
        amount_net: payload.amount_net,
        currency: payload.currency || 'HUF',
        date: payload.date,
        mileage_at_cost: payload.mileage_at_cost ?? null,
        description: payload.description || null,
        data: payload.data || {},
      }
      if (payload.organization_id != null) {
        body.organization_id = payload.organization_id
      }

      const res = await api.post('/expenses/', body)

      const responseData = res.data as ExpenseResponse
      lastSuccess.value = responseData
      console.log('[CostStore] Expense created successfully:', responseData)
      return responseData
    } catch (err: any) {
      const message =
        err.response?.data?.detail ||
        err.response?.data?.message ||
        'Nem sikerült rögzíteni a költséget. Ellenőrizd a kapcsolatot.'
      lastError.value = message
      console.error('[CostStore] addExpense error:', err)
      return null
    } finally {
      isSubmitting.value = false
    }
  }

  /**
   * Clear the last error and success state.
   */
  function resetState() {
    lastError.value = null
    lastSuccess.value = null
  }

  return {
    // State
    isSubmitting,
    lastError,
    lastSuccess,

    // Actions
    addExpense,
    resetState,
  }
})