import { defineProperty, Promisify, Time } from 'cosmokit'
import { HTTP, Schema } from '@satorijs/core'
import { GetEvents, Parameters, ReturnType, ThisType } from 'cordis'
import * as satori from '@satorijs/core'
import * as cordis from 'cordis'
import * as minato from 'minato'
import { Computed, FilterService } from './filter'
import { Commander } from './command'
import { I18n } from './i18n'
import SessionMixin, { Session } from './session'
import { Processor } from './middleware'
import { Permissions } from './permission'
import DatabaseMixin from './database'
import BotMixin from './bot'
import { SchemaService } from './schema'

export type EffectScope = cordis.EffectScope<Context>
export type ForkScope = cordis.ForkScope<Context>
export type MainScope = cordis.MainScope<Context>

export { Adapter, Bot, Element, h, HTTP, Logger, MessageEncoder, Messenger, Quester, Schema, segment, Universal, z } from '@satorijs/core'
export type { Component, Fragment, Render } from '@satorijs/core'

export { resolveConfig } from 'cordis'

export type { Disposable, ScopeStatus, Plugin } from 'cordis'

declare module 'cordis' {
  namespace Plugin {
    interface Object {
      filter?: boolean
    }
  }
}

export interface EnvData {}

type OmitSubstring<S extends string, T extends string> = S extends `${infer L}${T}${infer R}` ? `${L}${R}` : never
type BeforeEventName = OmitSubstring<keyof Events & string, 'before-'>
type BeforeEventMap = { [E in keyof Events & string as OmitSubstring<E, 'before-'>]: Events[E] }

export interface Events<C extends Context = Context> extends cordis.Events<C> {}

export interface Context {
  [Context.events]: Events<this>
  [Context.session]: Session<never, never, this>
  koishi: Koishi
}

export class Context extends satori.Context {
  static shadow = Symbol.for('session.shadow')

  constructor(config: Context.Config = {}) {
    super(config)
    this.mixin('$processor', ['match', 'middleware'])
    this.mixin('$filter', [
      'any', 'never', 'union', 'intersect', 'exclude',
      'user', 'self', 'guild', 'channel', 'platform', 'private',
    ])
    this.mixin('$commander', ['command'])
    this.provide('$filter', new FilterService(this), true)
    this.provide('schema', new SchemaService(this), true)
    this.provide('$processor', new Processor(this), true)
    this.provide('i18n', new I18n(this, this.config.i18n), true)
    this.provide('permissions', new Permissions(this), true)
    this.provide('model', undefined, true)
    this.provide('http', undefined, true)
    this.provide('$commander', new Commander(this, this.config), true)
    this.plugin(minato.Database)
    this.plugin(Koishi, this.config)
  }

  /** @deprecated use `ctx.root` instead */
  get app() {
    return this.root
  }

  /** @deprecated use `koishi.config` instead */
  get options() {
    return this.root.config
  }

  /* eslint-disable max-len */
  /** @deprecated */
  waterfall<K extends keyof GetEvents<this>>(name: K, ...args: Parameters<GetEvents<this>[K]>): Promisify<ReturnType<GetEvents<this>[K]>>
  waterfall<K extends keyof GetEvents<this>>(thisArg: ThisType<GetEvents<this>[K]>, name: K, ...args: Parameters<GetEvents<this>[K]>): Promisify<ReturnType<GetEvents<this>[K]>>
  async waterfall(...args: [any, ...any[]]) {
    const thisArg = typeof args[0] === 'object' || typeof args[0] === 'function' ? args.shift() : null
    const name = args.shift()
    for (const hook of this.lifecycle.filterHooks(this.lifecycle._hooks[name] || [], thisArg)) {
      const result = await hook.callback.apply(thisArg, args)
      args[0] = result
    }
    return args[0]
  }

  /** @deprecated */
  chain<K extends keyof GetEvents<this>>(name: K, ...args: Parameters<GetEvents<this>[K]>): ReturnType<GetEvents<this>[K]>
  chain<K extends keyof GetEvents<this>>(thisArg: ThisType<GetEvents<this>[K]>, name: K, ...args: Parameters<GetEvents<this>[K]>): ReturnType<GetEvents<this>[K]>
  chain(...args: [any, ...any[]]) {
    const thisArg = typeof args[0] === 'object' || typeof args[0] === 'function' ? args.shift() : null
    const name = args.shift()
    for (const hook of this.lifecycle.filterHooks(this.lifecycle._hooks[name] || [], thisArg)) {
      const result = hook.callback.apply(thisArg, args)
      args[0] = result
    }
    return args[0]
  }
  /* eslint-enable max-len */

  before<K extends BeforeEventName>(name: K, listener: BeforeEventMap[K], append = false) {
    const seg = (name as string).split('/')
    seg[seg.length - 1] = 'before-' + seg[seg.length - 1]
    return this.on(seg.join('/') as any, listener, !append)
  }
}

export default class Koishi extends cordis.Service<Context.Config, Context> {
  bot = new BotMixin(this.ctx)
  database = new DatabaseMixin(this.ctx)
  session = new SessionMixin(this.ctx)

  constructor(ctx: Context, public config: Context.Config) {
    super(ctx, 'koishi', true)
  }
}

satori.Session.prototype[Context.filter] = function (this: Session, ctx: Context) {
  return ctx.filter(this)
}

export namespace Context {
  export interface Config extends Config.Basic, Config.Advanced {
    i18n?: I18n.Config
    delay?: Config.Delay
    request?: HTTP.Config
  }

  export const Config = Schema.intersect([
    Schema.object({}),
  ]) as Config.Static

  export namespace Config {
    export interface Basic extends Commander.Config {
      nickname?: string | string[]
      autoAssign?: Computed<boolean>
      autoAuthorize?: Computed<number>
      minSimilarity?: number
    }

    export interface Delay {
      character?: number
      message?: number
      cancel?: number
      broadcast?: number
      prompt?: number
    }

    export interface Advanced {
      maxListeners?: number
    }

    export interface Static extends Schema<Config> {
      Basic: Schema<Basic>
      I18n: Schema<I18n>
      Delay: Schema<Delay>
      Advanced: Schema<Advanced>
    }
  }
}

defineProperty(Context.Config, 'Basic', Schema.object({
  prefix: Schema.array(Schema.string().default('')).default(['']).role('table').computed().description('指令前缀字符构成的数组。将被用于指令的匹配。'),
  prefixMode: Schema.union([
    Schema.const('auto').description('默认：当存在称呼时允许无前缀触发。'),
    Schema.const('strict').description('严格：只有在指令前缀匹配时才允许触发。'),
  ]).experimental().role('radio').default('auto').description('指令前缀匹配模式。'),
  nickname: Schema.array(String).role('table').computed().description('机器人昵称构成的数组。将被用于指令的匹配。'),
  autoAssign: Schema.boolean().default(true).computed().description('当获取不到频道数据时，是否使用接受者作为受理人。'),
  autoAuthorize: Schema.natural().default(1).computed().description('当获取不到用户数据时默认使用的权限等级。'),
  minSimilarity: Schema.percent().default(1).description('用于模糊匹配的相似系数，应该是一个 0 到 1 之间的数值。数值越高，模糊匹配越严格。设置为 1 可以完全禁用模糊匹配。'),
}).description('基础设置'))

defineProperty(Context.Config, 'I18n', I18n.Config)

defineProperty(Context.Config, 'Delay', Schema.object({
  character: Schema.natural().role('ms').default(0).description('调用 `session.sendQueued()` 时消息间发送的最小延迟，按前一条消息的字数计算。'),
  message: Schema.natural().role('ms').default(0.1 * Time.second).description('调用 `session.sendQueued()` 时消息间发送的最小延迟，按固定值计算。'),
  cancel: Schema.natural().role('ms').default(0).description('调用 `session.cancelQueued()` 时默认的延迟。'),
  broadcast: Schema.natural().role('ms').default(0.5 * Time.second).description('调用 `bot.broadcast()` 时默认的延迟。'),
  prompt: Schema.natural().role('ms').default(Time.minute).description('调用 `session.prompt()` 时默认的等待时间。'),
}))

defineProperty(Context.Config, 'Advanced', Schema.object({
  maxListeners: Schema.natural().default(64).description('每种监听器的最大数量。如果超过这个数量，Koishi 会认定为发生了内存泄漏，将产生一个警告。'),
}).description('高级设置'))

Context.Config.list.push(Context.Config.Basic)
Context.Config.list.push(Schema.object({
  i18n: I18n.Config,
}))
Context.Config.list.push(Schema.object({
  delay: Context.Config.Delay,
}).description('延迟设置'))
Context.Config.list.push(Context.Config.Advanced)
Context.Config.list.push(Schema.object({
  request: HTTP.Config,
}))

export abstract class Service<T = any, C extends Context = Context> extends satori.Service<T, C> {
  [satori.Service.setup]() {
    this.ctx = new Context() as C
  }
}

// for backward compatibility
export { Context as App }

export function defineConfig(config: Context.Config) {
  return config
}