-- Rename player fields in matches table
-- First, add new columns as nullable
ALTER TABLE "matches" ADD COLUMN "player1P1Id" INTEGER;
ALTER TABLE "matches" ADD COLUMN "player1P2Id" INTEGER;
ALTER TABLE "matches" ADD COLUMN "player2P1Id" INTEGER;
ALTER TABLE "matches" ADD COLUMN "player2P2Id" INTEGER;

-- Copy data from old columns to new columns
UPDATE "matches" SET "player1P1Id" = "team1P1Id";
UPDATE "matches" SET "player1P2Id" = "team1P2Id";
UPDATE "matches" SET "player2P1Id" = "team2P1Id";
UPDATE "matches" SET "player2P2Id" = "team2P2Id";

-- Drop old foreign key constraints
ALTER TABLE "matches" DROP CONSTRAINT "matches_team1P1Id_fkey";
ALTER TABLE "matches" DROP CONSTRAINT "matches_team1P2Id_fkey";
ALTER TABLE "matches" DROP CONSTRAINT "matches_team2P1Id_fkey";
ALTER TABLE "matches" DROP CONSTRAINT "matches_team2P2Id_fkey";

-- Drop old columns
ALTER TABLE "matches" DROP COLUMN "team1P1Id";
ALTER TABLE "matches" DROP COLUMN "team1P2Id";
ALTER TABLE "matches" DROP COLUMN "team2P1Id";
ALTER TABLE "matches" DROP COLUMN "team2P2Id";

-- Add foreign key constraints for new columns
ALTER TABLE "matches" ADD CONSTRAINT "matches_player1P1Id_fkey" FOREIGN KEY ("player1P1Id") REFERENCES "players"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
ALTER TABLE "matches" ADD CONSTRAINT "matches_player1P2Id_fkey" FOREIGN KEY ("player1P2Id") REFERENCES "players"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
ALTER TABLE "matches" ADD CONSTRAINT "matches_player2P1Id_fkey" FOREIGN KEY ("player2P1Id") REFERENCES "players"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
ALTER TABLE "matches" ADD CONSTRAINT "matches_player2P2Id_fkey" FOREIGN KEY ("player2P2Id") REFERENCES "players"("id") ON DELETE RESTRICT ON UPDATE CASCADE;