-- Global, unlimited-depth member group hierarchy (requirement 3.1-3.3).
-- Managed only by the platform super administrator; deliberately NOT
-- org-scoped. Stores membership + nesting only, never permission data.
-- Deletion is soft (archivedAt / revokedAt markers); a group delete
-- cascade-soft-deletes its whole subtree as an application operation.
-- The permission side (GROUP principal, FOLDER resource, grant inheritance)
-- is intentionally deferred to a later migration.

-- CreateTable
CREATE TABLE "MemberGroup" (
    "id" TEXT NOT NULL,
    "parentId" TEXT,
    "name" TEXT NOT NULL,
    "description" TEXT,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "updatedAt" TIMESTAMP(3) NOT NULL,
    "archivedAt" TIMESTAMP(3),

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

-- CreateTable
CREATE TABLE "MemberGroupMembership" (
    "id" TEXT NOT NULL,
    "groupId" TEXT NOT NULL,
    "userId" TEXT NOT NULL,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "revokedAt" TIMESTAMP(3),

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

-- CreateTable
CREATE TABLE "MemberGroupClosure" (
    "ancestorId" TEXT NOT NULL,
    "descendantId" TEXT NOT NULL,
    "depth" INTEGER NOT NULL,

    CONSTRAINT "MemberGroupClosure_pkey" PRIMARY KEY ("ancestorId", "descendantId")
);

-- CreateIndex
CREATE INDEX "MemberGroup_parentId_archivedAt_idx" ON "MemberGroup"("parentId", "archivedAt");

-- CreateIndex
CREATE INDEX "MemberGroupMembership_userId_revokedAt_idx" ON "MemberGroupMembership"("userId", "revokedAt");

-- CreateIndex
CREATE INDEX "MemberGroupMembership_groupId_revokedAt_idx" ON "MemberGroupMembership"("groupId", "revokedAt");

-- CreateIndex
CREATE UNIQUE INDEX "MemberGroupMembership_groupId_userId_revokedAt_key" ON "MemberGroupMembership"("groupId", "userId", "revokedAt");

-- CreateIndex
CREATE INDEX "MemberGroupClosure_descendantId_idx" ON "MemberGroupClosure"("descendantId");

-- AddForeignKey
ALTER TABLE "MemberGroup" ADD CONSTRAINT "MemberGroup_parentId_fkey" FOREIGN KEY ("parentId") REFERENCES "MemberGroup"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "MemberGroupMembership" ADD CONSTRAINT "MemberGroupMembership_groupId_fkey" FOREIGN KEY ("groupId") REFERENCES "MemberGroup"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "MemberGroupMembership" ADD CONSTRAINT "MemberGroupMembership_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "MemberGroupClosure" ADD CONSTRAINT "MemberGroupClosure_ancestorId_fkey" FOREIGN KEY ("ancestorId") REFERENCES "MemberGroup"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "MemberGroupClosure" ADD CONSTRAINT "MemberGroupClosure_descendantId_fkey" FOREIGN KEY ("descendantId") REFERENCES "MemberGroup"("id") ON DELETE CASCADE ON UPDATE CASCADE;