# frozen_string_literal: true

require "csv"

module EuchreCamp
  module Services
    class TournamentCsvImporter
      # Map table names to numeric IDs
      TABLE_NAME_MAP = {
        "Clubs" => 1,
        "Hearts" => 2,
        "Diamonds" => 3,
        "Spades" => 4,
        "Stars" => 5
      }.freeze

      def initialize(event_id:)
        @event_id = event_id
        @rom = EuchreCamp::App["persistence.rom"]
        @matches_repo = EuchreCamp::App["repositories.matches"]
        @teams_repo = EuchreCamp::App["repositories.teams"]
        @events_repo = EuchreCamp::App["repositories.events"]
        @rounds_repo = EuchreCamp::App["repositories.tournament_rounds"]
        @bracket_matchups_repo = EuchreCamp::App["repositories.bracket_matchups"]
      end

      def import(csv_file_path)
        results = {
          matches_created: 0,
          teams_created: 0,
          rounds_created: 0,
          errors: []
        }

        begin
          event = @events_repo.by_id(@event_id)
          
          CSV.foreach(csv_file_path, headers: true, header_converters: :symbol) do |row|
            begin
              process_row(row, event, results)
            rescue => e
              results[:errors] << "Row #{row}: #{e.message}"
            end
          end
        rescue => e
          results[:errors] << "Fatal error: #{e.message}"
        end

        results
      end

      private

      def process_row(row, event, results)
        # Extract data from CSV row
        round_number = row[:round].to_i
        table_name = row[:table]
        seat_1_name = row[:seat_1]&.strip
        seat_3_name = row[:seat_3]&.strip
        odds_points = row[:odds_points].to_i
        seat_2_name = row[:seat_2]&.strip
        seat_4_name = row[:seat_4]&.strip
        evens_points = row[:evens_points].to_i
        winner = row[:winner]&.strip&.downcase

        # Validate required fields
        unless seat_1_name && seat_3_name && seat_2_name && seat_4_name
          raise "Missing player names in row"
        end

        # Find or create players
        player_1 = find_or_create_player(seat_1_name)
        player_2 = find_or_create_player(seat_3_name)
        player_3 = find_or_create_player(seat_2_name)
        player_4 = find_or_create_player(seat_4_name)

        # Find or create teams
        team_1 = @teams_repo.find_or_create(@event_id, player_1[:id], player_2[:id], "#{seat_1_name} + #{seat_3_name}")
        team_2 = @teams_repo.find_or_create(@event_id, player_3[:id], player_4[:id], "#{seat_2_name} + #{seat_4_name}")

        results[:teams_created] += 1 if team_1[:created_at] == team_2[:created_at] # Rough check for new teams

        # Find or create round
        round = find_or_create_round(round_number)

        # Map table name to number
        table_number = TABLE_NAME_MAP[table_name] || table_name.to_i
        if table_number == 0
          raise "Unknown table name: #{table_name}"
        end

        # Determine winner based on scores or explicit winner column
        team_1_score = odds_points
        team_2_score = evens_points

        # Verify winner matches scores if explicitly stated
        if winner
          if winner == "odds" && team_1_score <= team_2_score
            results[:errors] << "Warning: Row claims Odds won but score is #{team_1_score}-#{team_2_score}"
          elsif winner == "evens" && team_2_score <= team_1_score
            results[:errors] << "Warning: Row claims Evens won but score is #{team_1_score}-#{team_2_score}"
          end
        end

        # Create match
        match_data = {
          team_1_p1_id: player_1[:id],
          team_1_p2_id: player_2[:id],
          team_1_score: team_1_score,
          team_2_p1_id: player_3[:id],
          team_2_p2_id: player_4[:id],
          team_2_score: team_2_score,
          played_at: Time.now,
          status: 'completed'
        }

        match = @matches_repo.create(match_data)
        results[:matches_created] += 1

        # Create bracket matchup entry
        bracket_data = {
          round_id: round[:id],
          event_id: @event_id,
          team_1_id: team_1[:id],
          team_2_id: team_2[:id],
          table_number: table_number,
          bracket_position: table_number,
          status: 'completed'
        }

        @bracket_matchups_repo.create(bracket_data)

        # Queue Elo calculation
        EuchreCamp::Jobs::CalculateEloJob.perform_later(match[:id])

      rescue => e
        raise "Error processing row: #{e.message}"
      end

      def find_or_create_player(name)
        return nil unless name

        player = @rom.relations[:players].where(name: name).one

        if player
          player
        else
          # Create player with default rating
          @rom.relations[:players].insert(name: name, rating: 0, current_elo: 1000)
          @rom.relations[:players].where(name: name).one
        end
      end

      def find_or_create_round(round_number)
        round = @rom.relations[:tournament_rounds].where(event_id: @event_id, round_number: round_number).one

        if round
          round
        else
          @rounds_repo.create(
            event_id: @event_id,
            round_number: round_number,
            status: 'completed'
          )
        end
      end
    end
  end
end