mahjong-web/src/game/chengdu/messageNormalizers.ts

import type {
  ClaimOptionState,
  MeldState,
  PendingClaimState,
  PlayerState,
  Tile,
} from '../../types/state'

export function normalizeWsType(type: string): string {
  return type.replace(/[-\s]/g, '_').toUpperCase()
}

export function asRecord(value: unknown): Record<string, unknown> | null {
  return value && typeof value === 'object' ? (value as Record<string, unknown>) : null
}

export function readString(source: Record<string, unknown>, ...keys: string[]): string {
  for (const key of keys) {
    const value = source[key]
    if (typeof value === 'string' && value.trim()) {
      return value
    }
  }
  return ''
}

export function readNumber(source: Record<string, unknown>, ...keys: string[]): number | null {
  for (const key of keys) {
    const value = source[key]
    if (typeof value === 'number' && Number.isFinite(value)) {
      return value
    }
  }
  return null
}

export function normalizeTimestampMs(value: number | null): number | null {
  if (typeof value !== 'number' || !Number.isFinite(value) || value <= 0) {
    return null
  }
  return value >= 1_000_000_000_000 ? value : value * 1000
}

export function readStringArray(source: Record<string, unknown>, ...keys: string[]): string[] {
  for (const key of keys) {
    const value = source[key]
    if (Array.isArray(value)) {
      return value.filter((item): item is string => typeof item === 'string')
    }
  }
  return []
}

export function readBoolean(source: Record<string, unknown>, ...keys: string[]): boolean | null {
  for (const key of keys) {
    const value = source[key]
    if (typeof value === 'boolean') {
      return value
    }
    if (typeof value === 'number') {
      if (value === 1) {
        return true
      }
      if (value === 0) {
        return false
      }
    }
    if (typeof value === 'string') {
      const normalized = value.trim().toLowerCase()
      if (normalized === 'true' || normalized === '1') {
        return true
      }
      if (normalized === 'false' || normalized === '0') {
        return false
      }
    }
  }
  return null
}

export function readMissingSuit(source: Record<string, unknown> | null | undefined): string | null {
  if (!source) {
    return null
  }
  return readString(source, 'missing_suit', 'MissingSuit', 'ding_que', 'dingQue', 'suit', 'Suit') || null
}

export function readMissingSuitWithPresence(
  source: Record<string, unknown> | null | undefined,
): { present: boolean; value: string | null } {
  if (!source) {
    return { present: false, value: null }
  }

  const keys = ['missing_suit', 'MissingSuit', 'ding_que', 'dingQue', 'suit', 'Suit']
  const hasMissingSuitField = keys.some((key) => Object.prototype.hasOwnProperty.call(source, key))
  if (!hasMissingSuitField) {
    return { present: false, value: null }
  }

  return { present: true, value: readMissingSuit(source) }
}

export function tileToText(tile: Tile): string {
  return `${tile.suit}${tile.value}`
}

export function readPlayerTurnPlayerId(payload: Record<string, unknown>): string {
  return (
    (typeof payload.player_id === 'string' && payload.player_id) ||
    (typeof payload.playerId === 'string' && payload.playerId) ||
    (typeof payload.PlayerID === 'string' && payload.PlayerID) ||
    ''
  )
}

export function readPlayerTurnAllowActions(payload: Record<string, unknown>): string[] {
  const source =
    payload.allow_actions ??
    payload.allowActions ??
    payload.AllowActions ??
    payload.available_actions ??
    payload.availableActions ??
    payload.AvailableActions
  if (!Array.isArray(source)) {
    return []
  }

  const actions = source
    .filter((item): item is string => typeof item === 'string')
    .map((item) => item.trim().toLowerCase())
    .filter((item) => item.length > 0)
  return Array.from(new Set(actions))
}

export function normalizeTile(tile: unknown): Tile | null {
  const source = asRecord(tile)
  if (!source) {
    return null
  }

  const id = readNumber(source, 'id')
  const suit = readString(source, 'suit') as Tile['suit'] | ''
  const value = readNumber(source, 'value')
  if (typeof id !== 'number' || !suit || typeof value !== 'number') {
    return null
  }

  if (suit !== 'W' && suit !== 'T' && suit !== 'B') {
    return null
  }

  return { id, suit, value }
}

export function normalizeTiles(value: unknown): Tile[] {
  if (!Array.isArray(value)) {
    return []
  }

  return value.map((item) => normalizeTile(item)).filter((item): item is Tile => Boolean(item))
}

export function normalizePendingClaim(
  gameState: Record<string, unknown> | null | undefined,
  loggedInUserId: string,
): PendingClaimState | undefined {
  if (!gameState || !loggedInUserId) {
    return undefined
  }

  const pendingClaim = asRecord(gameState.pending_claim ?? gameState.pendingClaim)
  if (!pendingClaim) {
    return undefined
  }

  const selfOptions = asRecord(pendingClaim[loggedInUserId])
  if (!selfOptions) {
    return undefined
  }

  const options: ClaimOptionState[] = []
  if (readBoolean(selfOptions, 'hu')) {
    options.push('hu')
  }
  if (readBoolean(selfOptions, 'gang')) {
    options.push('gang')
  }
  if (readBoolean(selfOptions, 'peng')) {
    options.push('peng')
  }
  if (options.length === 0) {
    return undefined
  }

  options.push('pass')

  return {
    tile: normalizeTile(gameState.last_discard_tile ?? gameState.lastDiscardTile) ?? undefined,
    fromPlayerId: readString(gameState, 'last_discard_by', 'lastDiscardBy') || undefined,
    options,
  }
}

export function normalizeMeldType(value: unknown, concealed = false): MeldState['type'] | null {
  if (typeof value !== 'string') {
    return concealed ? 'an_gang' : null
  }

  const normalized = value.replace(/[-\s]/g, '_').toLowerCase()
  if (normalized === 'peng') {
    return 'peng'
  }
  if (normalized === 'ming_gang' || normalized === 'gang' || normalized === 'gang_open') {
    return concealed ? 'an_gang' : 'ming_gang'
  }
  if (normalized === 'an_gang' || normalized === 'angang' || normalized === 'concealed_gang') {
    return 'an_gang'
  }

  return concealed ? 'an_gang' : null
}

export function normalizeMelds(value: unknown): PlayerState['melds'] {
  if (!Array.isArray(value)) {
    return []
  }

  return value
    .map((item) => {
      if (Array.isArray(item)) {
        const tiles = normalizeTiles(item)
        if (tiles.length === 3) {
          return { type: 'peng', tiles, fromPlayerId: '' } satisfies MeldState
        }
        if (tiles.length === 4) {
          return { type: 'ming_gang', tiles, fromPlayerId: '' } satisfies MeldState
        }
        return null
      }

      const source = asRecord(item)
      if (!source) {
        return null
      }

      const tiles = normalizeTiles(
        source.tiles ??
          source.meld_tiles ??
          source.meldTiles ??
          source.cards ??
          source.card_list,
      )
      if (tiles.length === 0) {
        return null
      }

      const concealed =
        readBoolean(source, 'concealed', 'is_concealed', 'isConcealed', 'hidden', 'is_hidden') ?? false
      const explicitType = normalizeMeldType(
        source.type ?? source.meld_type ?? source.meldType ?? source.kind,
        concealed,
      )
      const type =
        explicitType ??
        (tiles.length === 4 ? (concealed ? 'an_gang' : 'ming_gang') : tiles.length === 3 ? 'peng' : null)

      if (type === 'peng' || type === 'ming_gang') {
        return {
          type,
          tiles,
          fromPlayerId: readString(source, 'from_player_id', 'fromPlayerId'),
        } satisfies MeldState
      }

      if (type === 'an_gang') {
        return { type, tiles } satisfies MeldState
      }

      return null
    })
    .filter((item): item is MeldState => Boolean(item))
}