-- CreateEnum
DO $$ BEGIN
  CREATE TYPE "LeaveStatus" AS ENUM ('PENDING', 'APPROVED', 'REJECTED');
EXCEPTION
  WHEN duplicate_object THEN null;
END $$;

-- CreateTable
CREATE TABLE "leave_requests" (
    "id" TEXT NOT NULL,
    "tenant_id" TEXT NOT NULL,
    "user_id" TEXT NOT NULL,
    "start_date" DATE NOT NULL,
    "end_date" DATE NOT NULL,
    "reason" TEXT,
    "status" "LeaveStatus" NOT NULL DEFAULT 'PENDING',
    "rejection_reason" TEXT,
    "approved_by" TEXT,
    "approved_at" TIMESTAMP(3),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "updated_at" TIMESTAMP(3) NOT NULL,

    CONSTRAINT "leave_requests_pkey" PRIMARY KEY ("id")
);

-- CreateIndex
CREATE INDEX "leave_requests_tenant_id_user_id_start_date_idx" ON "leave_requests"("tenant_id", "user_id", "start_date");

-- CreateIndex
CREATE INDEX "leave_requests_tenant_id_status_start_date_idx" ON "leave_requests"("tenant_id", "status", "start_date");

-- CreateIndex
CREATE INDEX "leave_requests_tenant_id_approved_at_idx" ON "leave_requests"("tenant_id", "approved_at");

-- AddForeignKey
ALTER TABLE "leave_requests" ADD CONSTRAINT "leave_requests_tenant_id_fkey" FOREIGN KEY ("tenant_id") REFERENCES "tenants"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "leave_requests" ADD CONSTRAINT "leave_requests_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "leave_requests" ADD CONSTRAINT "leave_requests_approved_by_fkey" FOREIGN KEY ("approved_by") REFERENCES "users"("id") ON DELETE SET NULL ON UPDATE CASCADE;