import {derived, writable} from "svelte/store"
import {append, remove, spec} from "@welshman/lib"
import {APP_DATA} from "@welshman/util"
import {withGetter} from "@welshman/store"
import {AppData} from "@welshman/domain"
import type {AppDataReader} from "@welshman/domain"
import {DerivedPlugin, Domain, Network, User, projectFrom} from "@welshman/app"
import type {IApp, Projection} from "@welshman/app"
import {app, fromApp, usePlugin} from "@app/core"

export const SETTINGS = "flotilla/settings"

export enum RelayAuthMode {
  Aggressive = "aggressive",
  Conservative = "conservative",
}

export type SpaceNotificationSettings = {
  url: string
  notify: boolean
  exceptions: string[]
}

export type SettingsValues = {
  show_media: boolean
  hide_sensitive: boolean
  trusted_relays: string[]
  report_usage: boolean
  report_errors: boolean
  relay_auth: RelayAuthMode
  send_delay: number
  font_size: number
  alerts: SpaceNotificationSettings[]
  zap_amounts: number[]
}

export const defaultSettings: SettingsValues = {
  show_media: true,
  hide_sensitive: true,
  trusted_relays: [],
  report_usage: true,
  report_errors: true,
  relay_auth: RelayAuthMode.Conservative,
  send_delay: 0,
  font_size: 1.1,
  alerts: [],
  zap_amounts: [21, 210, 2100, 21000],
}

export class Settings extends DerivedPlugin<AppDataReader> {
  values: Projection<SettingsValues>

  constructor(app: IApp) {
    super(app, {
      filters: [{kinds: [APP_DATA], "#d": [SETTINGS]}],
      eventToItem: app.use(Domain).reader(AppData),
      getKey: settings => settings.author(),
    })

    this.values = projectFrom(this.index, $settings => ({
      ...defaultSettings,
      ...$settings.get(app.user?.pubkey ?? "")?.values<Partial<SettingsValues>>(),
    }))
  }

  fetch(pubkey: string) {
    return this.app.use(Network).loadUsingOutbox(pubkey, {kinds: [APP_DATA], "#d": [SETTINGS]})
  }
}

export const settings = usePlugin(Settings)

export const userSettingsValues = withGetter(fromApp($app => $app.use(Settings).values.$))

export const zapAmounts = derived(userSettingsValues, $settings => $settings.zap_amounts)

export const getSetting = <K extends keyof SettingsValues>(key: K) => userSettingsValues.get()[key]

export const getShouldNotify = ({alerts}: SettingsValues, url: string, h?: string) => {
  const pref = alerts.find(spec({url}))

  if (!pref) return true
  if (!h) return pref.notify

  return pref.notify ? !pref.exceptions.includes(h) : pref.exceptions.includes(h)
}

export const shouldNotify = (url: string, h?: string) =>
  getShouldNotify(userSettingsValues.get(), url, h)

export const deriveShouldNotify = (url: string, h?: string) =>
  derived(userSettingsValues, $settings => getShouldNotify($settings, url, h))

export const notificationSettings = withGetter(
  writable({
    push: false,
    sound: true,
    badge: false,
    spaces: true,
    mentions: true,
    messages: true,
  }),
)

export const publishSettings = async (params: Partial<SettingsValues>) => {
  const $app = app.get()
  const reader = await settings.get().forceLoad(User.require($app).pubkey)
  const writer = $app
    .use(Domain)
    .writer(AppData, reader)
    .setIdentifier(SETTINGS)
    .setEncrypted(true)
    .setValues({...userSettingsValues.get(), ...params})

  const command = await $app.use(Domain).command(writer)

  return command.publish()
}

export const addTrustedRelay = (url: string) =>
  publishSettings({trusted_relays: append(url, getSetting("trusted_relays"))})

export const removeTrustedRelay = (url: string) =>
  publishSettings({trusted_relays: remove(url, getSetting("trusted_relays"))})

export const setSpaceNotifications = (url: string, notify: boolean) => {
  const alerts = getSetting("alerts")
  const existing = alerts.find(spec({url}))

  if (existing) {
    return publishSettings({
      alerts: alerts.map(s => (s.url === url ? {...s, notify, exceptions: []} : s)),
    })
  }

  return publishSettings({alerts: [...alerts, {url, notify, exceptions: []}]})
}

export const toggleRoomNotifications = (url: string, h: string) => {
  const alerts = getSetting("alerts")
  const existing = alerts.find(spec({url}))

  if (existing) {
    const exceptions = existing.exceptions.includes(h)
      ? remove(h, existing.exceptions)
      : append(h, existing.exceptions)

    return publishSettings({alerts: alerts.map(s => (s.url === url ? {...s, exceptions} : s))})
  }

  return publishSettings({alerts: [...alerts, {url, notify: true, exceptions: [h]}]})
}