-- 022: WP6 live-stream destinations + stream outputs (go-live slice).
--
-- Aggregate boundary (proposal §4.4, WP6/WP9): a `live_stream_destinations`
-- row owns the platform-side live target — provider, ingest endpoint URL and
-- the vaulted ingest credential — and never references media outputs. A
-- `stream_outputs` row is a media-output fan-out from a virtual channel and
-- references EITHER a destination (credential resolved through the
-- destination at spawn) OR its own generic credential handle — never both
-- (CHECK below, mirrored in packages/core/src/vc.ts and API validation).
-- Enablement lives only on StreamOutput; the destination carries no
-- enabled flag of its own, so "disable one output" never mutates the shared
-- platform target.
--
-- FK actions per the WP6 lifecycle rule: both cross-aggregate FKs are
-- ON DELETE NO ACTION ON UPDATE RESTRICT; deletion is app-driven — 409 while
-- a referencing output is enabled, otherwise (disabled output) the app
-- disables dependents, revokes the ingest credential, then deletes the row.
-- `credentials` gains the tenant-composite key this migration needs
-- (tenant-composite FKs everywhere, per proposal §4.4/§4.5).
--
-- Query catalog (owning WP: WP6 — packages/db does not exist in this repo, so
-- the catalog lives here and in apps/api/src/live/live-destination.repository.ts):
--   live.destinations.list     keyset page ORDER BY label — served by
--     live_destinations_ws_label; read path, p95 <= 20 ms.
--   live.destinations.usage    point lookup of referencing outputs by
--     destination (tenant) — served by stream_outputs_destination partial
--     index; read path, p95 <= 20 ms.
--   live.outputs.channel       channel fan-out list — served by
--     stream_outputs_channel; read path, p95 <= 20 ms.
BEGIN;

-- 001 created credentials with only a surrogate PK; 018 added the
-- tenant-composite key the cross-aggregate FK below requires.
DO $$
BEGIN
  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'credentials_id_workspace_key') THEN
    ALTER TABLE credentials ADD CONSTRAINT credentials_id_workspace_key UNIQUE (id, workspace_id);
  END IF;
END $$;

CREATE TABLE live_stream_destinations (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id uuid NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE ON UPDATE RESTRICT,
  label text NOT NULL CHECK (btrim(label) <> '' AND length(label) <= 120),
  -- Provider of the platform-side target (manifest id of a connector); the
  -- app resolves behaviour through the connector registry, never by branching
  -- on this value.
  provider text NOT NULL CHECK (btrim(provider) <> '' AND length(provider) <= 64),
  -- Ingest endpoint (rtmp/rtmps/srt). Validated app-side by the shared
  -- media-control endpoint shape validator before insert; the CHECKs here are
  -- coarse backstops only.
  endpoint_url text NOT NULL
    CHECK (endpoint_url ~ '^(rtmp|rtmps|srt)://' AND length(endpoint_url) <= 2048),
  -- Ingest credential (stream key etc.) vaulted in `credentials`; NULL only
  -- for providers with no key. Tenant-composite FK; deleting the credential
  -- row before the destination is a FK error by design (lifecycle revokes in
  -- order: destination first, then its credential).
  credential_id uuid,
  -- Derived, explicitly-stale platform state (runtime truth is Redis obs:*).
  last_platform_state text NOT NULL DEFAULT 'unknown'
    CHECK (last_platform_state IN ('unknown', 'created', 'waiting', 'live', 'ended')),
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  UNIQUE (workspace_id, id),
  FOREIGN KEY (credential_id, workspace_id) REFERENCES credentials (id, workspace_id)
    ON DELETE NO ACTION ON UPDATE RESTRICT
);

CREATE TRIGGER trg_live_dest_ws_immutable BEFORE UPDATE ON live_stream_destinations
  FOR EACH ROW EXECUTE FUNCTION reject_workspace_change();
-- Same fail-closed tenant isolation as every tenant table (001/021 style):
-- no app.workspace_id => NULL => no rows. FORCE binds sp_app too.
ALTER TABLE live_stream_destinations ENABLE ROW LEVEL SECURITY;
ALTER TABLE live_stream_destinations FORCE ROW LEVEL SECURITY;

CREATE POLICY tenant_isolation ON live_stream_destinations
  USING (workspace_id = NULLIF(current_setting('app.workspace_id', true), '')::uuid)
  WITH CHECK (workspace_id = NULLIF(current_setting('app.workspace_id', true), '')::uuid);

-- Per-workspace listing ordered by label (live.destinations.list).
CREATE INDEX live_destinations_ws_label ON live_stream_destinations (workspace_id, label);

-- Media-output fan-out of a virtual channel onto one live target.
CREATE TABLE stream_outputs (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id uuid NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE ON UPDATE RESTRICT,
  virtual_channel_id uuid NOT NULL,
  label text NOT NULL CHECK (btrim(label) <> '' AND length(label) <= 120),
  -- Output profile reference; resolution is app-side.
  profile text NOT NULL DEFAULT '720p30'
    CHECK (profile IN ('720p30', '1080p30', '1080p60')),
  mode text NOT NULL DEFAULT 'passthrough' CHECK (mode IN ('passthrough', 'normalize')),
  -- Enablement lives ONLY here (WP9): a disabled output stops pushing but the
  -- destination row and its credential survive untouched.
  enabled boolean NOT NULL DEFAULT true,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  -- Exactly one of (destination_id, credential_handle_id): destination-
  -- referenced outputs resolve the ingest credential through the destination
  -- at spawn; generic outputs carry their own opaque vault handle. The
  -- NOT-VALID backstop below is validated app-side (021-style split).
  destination_id uuid,
  credential_handle_id text,
  CONSTRAINT stream_outputs_target_exclusive CHECK (
    (destination_id IS NULL) <> (credential_handle_id IS NULL)
  ),
  CONSTRAINT stream_outputs_handle_shape CHECK (
    credential_handle_id IS NULL OR credential_handle_id ~ '^vh_[A-Za-z0-9_-]{16,128}$'
  ),
  UNIQUE (workspace_id, id),
  UNIQUE (workspace_id, virtual_channel_id, id),
  FOREIGN KEY (workspace_id, virtual_channel_id) REFERENCES virtual_channels (workspace_id, id)
    ON DELETE CASCADE ON UPDATE RESTRICT,
  FOREIGN KEY (destination_id, workspace_id) REFERENCES live_stream_destinations (id, workspace_id)
    ON DELETE NO ACTION ON UPDATE RESTRICT
);

CREATE TRIGGER trg_stream_outputs_ws_immutable BEFORE UPDATE ON stream_outputs
  FOR EACH ROW EXECUTE FUNCTION reject_workspace_change();
ALTER TABLE stream_outputs ENABLE ROW LEVEL SECURITY;
ALTER TABLE stream_outputs FORCE ROW LEVEL SECURITY;

CREATE POLICY tenant_isolation ON stream_outputs
  USING (workspace_id = NULLIF(current_setting('app.workspace_id', true), '')::uuid)
  WITH CHECK (workspace_id = NULLIF(current_setting('app.workspace_id', true), '')::uuid);

-- References by destination (live.destinations.usage, 409 on delete).
CREATE INDEX stream_outputs_destination ON stream_outputs (workspace_id, destination_id)
  WHERE destination_id IS NOT NULL;
-- Channel fan-out listing (live.outputs.channel).
CREATE INDEX stream_outputs_channel ON stream_outputs (workspace_id, virtual_channel_id);

GRANT SELECT, INSERT, UPDATE, DELETE ON live_stream_destinations TO sp_app;
GRANT SELECT, INSERT, UPDATE, DELETE ON stream_outputs TO sp_app;

COMMIT;