-- Platform Kernel v1 (spec sectiunile 3, 4, 11, 29).
-- Aditiv si idempotent: coloanele noi sunt nullable sau au default, ca sa nu
-- pice pe randurile existente.

-- 1. Workspaces -------------------------------------------------------------
DO $$ BEGIN
  CREATE TYPE "workspace_type" AS ENUM ('personal','family','business','community','project');
EXCEPTION WHEN duplicate_object THEN NULL; END $$;

CREATE TABLE IF NOT EXISTS "workspaces" (
  "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
  "tenant_id" uuid NOT NULL,
  "name" text NOT NULL,
  "type" "workspace_type" DEFAULT 'business' NOT NULL,
  "is_default" integer DEFAULT 0 NOT NULL,
  "created_at" timestamp DEFAULT now() NOT NULL,
  "created_by" uuid,
  "deleted_at" timestamp
);
CREATE INDEX IF NOT EXISTS "workspaces_tenant_idx" ON "workspaces" ("tenant_id");

-- Backfill: fiecare tenant existent primeste workspace-ul implicit. Fara asta,
-- SessionGuard ar respinge toate requesturile tenantilor creati inainte.
INSERT INTO "workspaces" ("tenant_id", "name", "type", "is_default")
SELECT t."id", t."name", 'business', 1
FROM "tenants" t
WHERE NOT EXISTS (SELECT 1 FROM "workspaces" w WHERE w."tenant_id" = t."id");

-- 2. Memberships: scope pe workspace + fereastra de valabilitate -------------
ALTER TABLE "memberships" ADD COLUMN IF NOT EXISTS "workspace_id" uuid;
ALTER TABLE "memberships" ADD COLUMN IF NOT EXISTS "valid_from" timestamp;
ALTER TABLE "memberships" ADD COLUMN IF NOT EXISTS "valid_until" timestamp;
CREATE INDEX IF NOT EXISTS "memberships_workspace_idx" ON "memberships" ("workspace_id");

-- 3. Event envelope complet -------------------------------------------------
ALTER TABLE "outbox_events" ADD COLUMN IF NOT EXISTS "workspace_id" uuid;
ALTER TABLE "outbox_events" ADD COLUMN IF NOT EXISTS "occurred_at" timestamp DEFAULT now() NOT NULL;
ALTER TABLE "outbox_events" ADD COLUMN IF NOT EXISTS "actor_id" uuid;
ALTER TABLE "outbox_events" ADD COLUMN IF NOT EXISTS "aggregate_type" text;
ALTER TABLE "outbox_events" ADD COLUMN IF NOT EXISTS "causation_id" uuid;
ALTER TABLE "outbox_events" ADD COLUMN IF NOT EXISTS "classification" text DEFAULT 'c2' NOT NULL;
ALTER TABLE "outbox_events" ADD COLUMN IF NOT EXISTS "provenance" jsonb DEFAULT '{}'::jsonb NOT NULL;
CREATE INDEX IF NOT EXISTS "outbox_unprocessed_idx" ON "outbox_events" ("processed_at","created_at");

-- 4. Audit envelope complet -------------------------------------------------
ALTER TABLE "audit_log" ADD COLUMN IF NOT EXISTS "workspace_id" uuid;
ALTER TABLE "audit_log" ADD COLUMN IF NOT EXISTS "actor_type" text DEFAULT 'user' NOT NULL;
ALTER TABLE "audit_log" ADD COLUMN IF NOT EXISTS "purpose" text;
ALTER TABLE "audit_log" ADD COLUMN IF NOT EXISTS "changed_fields" jsonb;
ALTER TABLE "audit_log" ADD COLUMN IF NOT EXISTS "before_hash" text;
ALTER TABLE "audit_log" ADD COLUMN IF NOT EXISTS "after_hash" text;
ALTER TABLE "audit_log" ADD COLUMN IF NOT EXISTS "session_id" text;
CREATE INDEX IF NOT EXISTS "audit_tenant_created_idx" ON "audit_log" ("tenant_id","created_at");