import { ref } from 'vue'

export type ToastType = 'success' | 'error' | 'warning' | 'info'

export interface Toast {
  id: number
  message: string
  type: ToastType
  visible: boolean
}

const toasts = ref<Toast[]>([])
const MAX_TOASTS = 3
let nextId = 1

// Anti-doublon : ignore un toast identique affiché dans les 2 dernières secondes
const recentMessages = new Map<string, number>()
const DEDUP_WINDOW = 2000

export function useToast() {
  const showToast = (message: string, type: ToastType = 'info', duration = 3500): number => {
    const dedupKey = `${type}::${message}`
    const lastShown = recentMessages.get(dedupKey)
    if (lastShown && Date.now() - lastShown < DEDUP_WINDOW) {
      return -1
    }
    recentMessages.set(dedupKey, Date.now())

    const id = nextId++
    const toast: Toast = {
      id,
      message,
      type,
      visible: true,
    }

    if (toasts.value.length >= MAX_TOASTS) {
      toasts.value.shift()
    }

    toasts.value.push(toast)

    // Auto-remove after duration
    setTimeout(() => {
      removeToast(id)
    }, duration)

    return id
  }

  const showSuccess = (message: string, duration = 5000): number => {
    return showToast(message, 'success', duration)
  }

  const showError = (message: string, duration = 5000): number => {
    return showToast(message, 'error', duration)
  }

  const showWarning = (message: string, duration = 6000): number => {
    return showToast(message, 'warning', duration)
  }

  const showInfo = (message: string, duration = 5000): number => {
    return showToast(message, 'info', duration)
  }

  const removeToast = (id: number): void => {
    const index = toasts.value.findIndex((toast) => toast.id === id)
    if (index !== -1 && toasts.value[index]) {
      toasts.value[index].visible = false
      setTimeout(() => {
        toasts.value.splice(index, 1)
      }, 300) // Animation duration
    }
  }

  const clearAll = (): void => {
    toasts.value = []
    recentMessages.clear()
  }

  return {
    toasts,
    showToast,
    showSuccess,
    showError,
    showWarning,
    showInfo,
    removeToast,
    clearAll,
  }
}