import { all, any, curry, lens, lensProp, pipe, view } from 'ramda'
import { match } from 'ts-pattern'
import { addBonusAction, revertActivePlayerToCurrent, setFrameToAllowFreeUsage, withFrame } from '../board/frame'
import { moveClergyToOwnBuilding } from '../board/landscape'
import { activeLens, isLayBrother, isPrior } from '../board/player'
import { GameCommandEnum, GameStatePlaying, NextUseClergy, StateReducer } from '../types'

// there are two modes of this, really...

// first, if activePlayer == currentPlayer, then make it so the next "use" is with a prior
// -> fail if they have no prior available
// -> otherwise set the nextUse = NextUseClergy.OnlyPrior
const withPriorForCurrentPlayer: StateReducer = (state) => {
  if (state === undefined) return undefined
  if (state.players[state.frame.activePlayerIndex].clergy.some(isPrior) === false) return undefined
  return withFrame((frame) => ({
    ...frame,
    nextUse: NextUseClergy.OnlyPrior,
    mainActionUsed: true,
  }))(state)
}

// second, if activePlayer != currentPlayer, as in a work contract, then
// -> move the player's prior onto the building in usableBuildings (work contracted building)
// -> set the nextUse = NextUseClergy.Free
// -> set the activePlayer back to currentPlayer
const withPriorForWorkContract: StateReducer = (state) => {
  if (state === undefined) return undefined
  if (state.frame.usableBuildings.length !== 1) return undefined
  return pipe(
    //
    withPriorForCurrentPlayer,
    moveClergyToOwnBuilding(state.frame.usableBuildings[0]),
    setFrameToAllowFreeUsage([state.frame.usableBuildings[0]]),
    revertActivePlayerToCurrent
  )(state)
}

export const withPrior: StateReducer = (state) => {
  if (state === undefined) return undefined
  if (state.frame.activePlayerIndex === state.frame.currentPlayerIndex) {
    return pipe(
      //
      withPriorForCurrentPlayer,
      addBonusAction(GameCommandEnum.USE)
    )(state)
  }
  return withPriorForWorkContract(state)
}

export const complete =
  (state: GameStatePlaying) =>
  (partial: string[]): string[] =>
    match<string[], string[]>(partial)
      .with([], () => {
        const player = view(activeLens(state), state)
        const control = view(lensProp('frame'), state)
        if (control.activePlayerIndex === control.currentPlayerIndex) {
          // this is the normal case, outside of work_contract
          if (control.nextUse === NextUseClergy.OnlyPrior) return []
          if (control.mainActionUsed) return []
        }
        if (all(isLayBrother, player.clergy)) return []
        return [GameCommandEnum.WITH_PRIOR]
      })
      .with([GameCommandEnum.WITH_PRIOR], () => {
        return ['']
      })
      .otherwise(() => [])