# frozen_string_literal: true

class MatchesController < ApplicationController
  before_action :set_match, only: %i[show update]
  before_action :validate_params, only: %i[update]
  before_action -> { require_owner! @match.owner }, only: %i[update]
  before_action :set_tournament, only: %i[index]

  # GET/tournaments/1/matches
  def index
    render json: @tournament.matches, each_serializer: MatchSerializer
  end

  # GET /matches/1
  def show
    render json: @match, include: ['match_scores.points', 'match_scores.team', 'bets']
  end

  # PATCH/PUT /matches/1
  def update
    new_state = match_params['state']

    Match.transaction do
      if @match.update(match_params)
        handle_match_end if new_state == 'finished'

        render json: @match
      else
        render json: @match.errors, status: :unprocessable_entity
        raise ActiveRecord::Rollback
      end
    end
  end

  private

  def handle_match_end
    return if @match.group_match?

    if @match.winner.nil?
      render json: { error: 'Stopping undecided Matches isn\'t allowed in playoff stage' },
             status: :unprocessable_entity
      raise ActiveRecord::Rollback
    end

    return if PopulateMatchBelowAndSave.call(match: @match).success?

    render json: { error: 'Moving Team one stage down failed' },
           status: :unprocessable_entity
    raise ActiveRecord::Rollback
  end

  def validate_params
    case match_params['state']
    when 'in_progress'
      render json: { error: 'Match can\'t start in this state' }, status: :unprocessable_entity \
        unless @match.not_started?
    when 'finished'
      render json: { error: 'Match can\'t finish in this state' }, status: :unprocessable_entity \
        unless @match.in_progress?
    else
      render json: { error: 'Invalid target state' }, status: :unprocessable_entity
    end
  end

  def set_match
    @match = Match.find(params[:id])
  end

  def set_tournament
    @tournament = Tournament.find(params[:tournament_id])
  end

  def match_params
    params.slice(:state).permit!
  end
end