import { computed } from 'vue'
import { defineStore } from 'pinia'
import { useUserStore } from '@KTXC'

const MESSAGE_READ_ENABLED_KEY = 'mail.behaviour.messageReadEnabled'
const MESSAGE_READ_DELAY_KEY = 'mail.behaviour.messageReadDelay'
const FOLDER_VIEW_MODE_KEY = 'mail.folderViewMode'

const DEFAULT_MESSAGE_READ_ENABLED = false
const DEFAULT_MESSAGE_READ_DELAY = 5
const DEFAULT_FOLDER_VIEW_MODE = 'tree'

export type FolderViewMode = 'tree' | 'page'

export const messageReadDelayOptions = [
  { value: 2, title: '2 seconds' },
  { value: 5, title: '5 seconds' },
  { value: 10, title: '10 seconds' },
  { value: 30, title: '30 seconds' },
]

export const folderViewModeOptions = [
  { value: 'tree', title: 'Tree' },
  { value: 'page', title: 'Page' },
]

function normalizeBoolean(value: unknown, fallback: boolean): boolean {
  if (typeof value === 'boolean') {
    return value
  }

  return fallback
}

function normalizePositiveNumber(value: unknown, fallback: number): number {
  const normalized = Number(value)

  return Number.isFinite(normalized) && normalized > 0 ? normalized : fallback
}

function normalizeFolderViewMode(value: unknown, fallback: FolderViewMode): FolderViewMode {
  return value === 'tree' || value === 'page' ? value : fallback
}

export const useMailSettingsStore = defineStore('mailSettingsStore', () => {
  const userStore = useUserStore()

  const messageReadEnabled = computed({
    get: () => normalizeBoolean(userStore.getSetting(MESSAGE_READ_ENABLED_KEY), DEFAULT_MESSAGE_READ_ENABLED),
    set: (value: boolean) => userStore.setSetting(MESSAGE_READ_ENABLED_KEY, value),
  })

  const messageReadDelay = computed({
    get: () => normalizePositiveNumber(userStore.getSetting(MESSAGE_READ_DELAY_KEY), DEFAULT_MESSAGE_READ_DELAY),
    set: (value: number) => userStore.setSetting(
      MESSAGE_READ_DELAY_KEY,
      normalizePositiveNumber(value, DEFAULT_MESSAGE_READ_DELAY),
    ),
  })

  const folderViewMode = computed({
    get: () => normalizeFolderViewMode(userStore.getSetting(FOLDER_VIEW_MODE_KEY), DEFAULT_FOLDER_VIEW_MODE),
    set: (value: FolderViewMode) => userStore.setSetting(
      FOLDER_VIEW_MODE_KEY,
      normalizeFolderViewMode(value, DEFAULT_FOLDER_VIEW_MODE),
    ),
  })

  return {
    folderViewMode,
    messageReadEnabled,
    messageReadDelay,
  }
})