-- 023: WP7 bulk source import + live-settings guard.
--
-- Three additive pieces, one migration:
--
-- (1) `virtual_channel_sources` (013) is widened to admit *imported* sources.
--     013's CHECK only modelled hand-entered HLS URLs and local playlists; a
--     PeerTube channel/live imported in bulk carries `remote_ref` +
--     `connection_id` and has an HLS URL only once a live is resolvable. The
--     dedupe key UNIQUE (workspace_id, virtual_channel_id, remote_ref) from
--     013 is unchanged and stays the only dedupe authority: imports write
--     INSERT ... ON CONFLICT DO NOTHING RETURNING id.
--
-- (2) `virtual_channel_imports`: one row per bulk import request. The HTTP
--     request only parses + validates + creates the job row; resolution and
--     inserts run in the background, and the row is the progress/report
--     document (processed/total + imported/duplicate/invalid/failed counts
--     and a bounded per-entry outcome list). A `running` row whose heartbeat
--     (`updated_at`) went stale is reaped to `abandoned` on read, so a
--     process crash never leaves a job spinning forever.
--
-- (3) `virtual_channel_live_settings`: the channel's live output settings
--     (profile/resolution, latency, replay policy) behind an optimistic
--     concurrency `version`. Writers take the channel row FOR UPDATE (one
--     writer per channel), then CAS on `version`; a stale version or a
--     started live is a 409 with nothing written. The CHECKs mirror the
--     app-side validator (WP7 acceptance: permanentLive + saveReplay and an
--     out-of-range latencyMode are rejected by the DB on a direct insert
--     too), and a trigger keeps `version` monotone.
--
-- House style throughout: tenant-composite keys (id, workspace_id), composite
-- FKs that pin every child to one workspace's channel, reject_workspace_change
-- / reject_owner_change immutability, FORCE RLS with the NULLIF tenant policy,
-- grants to sp_app (003 adds the default-privilege side for future tables).

SET LOCAL lock_timeout = '5s';

-- (1) Imported sources: kind 'hls' now requires an HLS URL *or* a remote_ref
-- (a channel imported now, playback attached when its live starts). The
-- playlist arm is untouched: local, connectionless, remote_ref-less.
ALTER TABLE virtual_channel_sources DROP CONSTRAINT virtual_channel_sources_check;
ALTER TABLE virtual_channel_sources ADD CONSTRAINT virtual_channel_sources_check CHECK (
  (
    kind = 'hls' AND playlist_loop IS NULL
    AND (hls_url IS NOT NULL OR remote_ref IS NOT NULL)
  ) OR (
    kind = 'playlist' AND hls_url IS NULL AND remote_ref IS NULL
    AND connection_id IS NULL AND playlist_loop IS NOT NULL
  )
);

-- (2) Import jobs.
CREATE TABLE virtual_channel_imports (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id uuid NOT NULL,
  virtual_channel_id uuid NOT NULL,
  -- Connection the import resolves through (default host for bare handles).
  connection_id uuid,
  status text NOT NULL DEFAULT 'running'
    CHECK (status IN ('running', 'completed', 'failed', 'abandoned')),
  -- total counts every input row (valid or not); processed advances per row.
  total int NOT NULL DEFAULT 0 CHECK (total >= 0 AND total <= 5000),
  processed int NOT NULL DEFAULT 0 CHECK (processed >= 0 AND processed <= total),
  imported int NOT NULL DEFAULT 0 CHECK (imported >= 0),
  duplicate int NOT NULL DEFAULT 0 CHECK (duplicate >= 0),
  invalid int NOT NULL DEFAULT 0 CHECK (invalid >= 0),
  failed int NOT NULL DEFAULT 0 CHECK (failed >= 0),
  -- Bounded per-entry report (first IMPORT_REPORT_ENTRY_LIMIT rows): what the
  -- user pasted, what happened, why. Counts are always authoritative.
  entries jsonb NOT NULL DEFAULT '[]'::jsonb CHECK (jsonb_typeof(entries) = 'array'),
  error text,
  created_by uuid,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  completed_at timestamptz,
  UNIQUE (id, workspace_id),
  FOREIGN KEY (workspace_id, virtual_channel_id) REFERENCES virtual_channels (workspace_id, id)
    ON DELETE CASCADE ON UPDATE RESTRICT,
  FOREIGN KEY (connection_id, workspace_id) REFERENCES connections (id, workspace_id)
    ON DELETE NO ACTION ON UPDATE RESTRICT DEFERRABLE INITIALLY DEFERRED
);

CREATE TRIGGER trg_vci_ws_immutable BEFORE UPDATE ON virtual_channel_imports
  FOR EACH ROW EXECUTE FUNCTION reject_workspace_change();
CREATE TRIGGER trg_vci_owner_immutable BEFORE UPDATE ON virtual_channel_imports
  FOR EACH ROW EXECUTE FUNCTION reject_owner_change('virtual_channel_id');

ALTER TABLE virtual_channel_imports ENABLE ROW LEVEL SECURITY;
ALTER TABLE virtual_channel_imports FORCE ROW LEVEL SECURITY;

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

CREATE INDEX virtual_channel_imports_channel
  ON virtual_channel_imports (workspace_id, virtual_channel_id, created_at DESC);

-- (3) Channel live settings, version-fenced.
CREATE TABLE virtual_channel_live_settings (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  workspace_id uuid NOT NULL,
  virtual_channel_id uuid NOT NULL,
  -- Output shape: a named preset, or an explicit triple (custom).
  output_profile text NOT NULL DEFAULT '720p30'
    CHECK (output_profile IN ('720p30', '1080p30', '1080p60', 'custom')),
  width int CHECK (width IS NULL OR (width >= 16 AND width <= 7680 AND width % 2 = 0)),
  height int CHECK (height IS NULL OR (height >= 16 AND height <= 4320 AND height % 2 = 0)),
  fps int CHECK (fps IS NULL OR (fps >= 1 AND fps <= 120)),
  -- LiveVideoLatencyMode: 1=Default, 2=High latency, 3=Small latency.
  latency_mode int NOT NULL DEFAULT 1 CHECK (latency_mode IN (1, 2, 3)),
  permanent_live boolean NOT NULL DEFAULT false,
  save_replay boolean NOT NULL DEFAULT false,
  -- Replay privacy etc.; only meaningful while save_replay is on.
  replay_settings jsonb CHECK (replay_settings IS NULL OR jsonb_typeof(replay_settings) = 'object'),
  -- Latch: once the channel's live has started, settings are frozen (409).
  live_started_at timestamptz,
  -- Optimistic concurrency: every accepted write bumps version exactly once.
  version bigint NOT NULL DEFAULT 0 CHECK (version >= 0),
  updated_by uuid,
  created_at timestamptz NOT NULL DEFAULT now(),
  updated_at timestamptz NOT NULL DEFAULT now(),
  UNIQUE (workspace_id, virtual_channel_id),
  UNIQUE (id, workspace_id),
  FOREIGN KEY (workspace_id, virtual_channel_id) REFERENCES virtual_channels (workspace_id, id)
    ON DELETE CASCADE ON UPDATE RESTRICT,
  CHECK (
    (output_profile <> 'custom' AND width IS NULL AND height IS NULL AND fps IS NULL)
    OR (output_profile = 'custom' AND width IS NOT NULL AND height IS NOT NULL AND fps IS NOT NULL)
  ),
  -- PeerTube rejects saveReplay + permanentLive (400); we refuse it earlier
  -- and the DB refuses it for direct inserts.
  CHECK (NOT (permanent_live AND save_replay)),
  CHECK (save_replay OR replay_settings IS NULL)
);

CREATE TRIGGER trg_vcls_ws_immutable BEFORE UPDATE ON virtual_channel_live_settings
  FOR EACH ROW EXECUTE FUNCTION reject_workspace_change();
CREATE TRIGGER trg_vcls_owner_immutable BEFORE UPDATE ON virtual_channel_live_settings
  FOR EACH ROW EXECUTE FUNCTION reject_owner_change('virtual_channel_id');

-- version never regresses; a stale CAS writer cannot rewind the fence.
CREATE FUNCTION reject_live_settings_version_regression() RETURNS trigger
LANGUAGE plpgsql AS $$
BEGIN
  IF NEW.version < OLD.version THEN
    RAISE EXCEPTION 'live settings version cannot decrease' USING ERRCODE = '23514';
  END IF;
  RETURN NEW;
END $$;

CREATE TRIGGER trg_vcls_version_monotone BEFORE UPDATE ON virtual_channel_live_settings
  FOR EACH ROW EXECUTE FUNCTION reject_live_settings_version_regression();

ALTER TABLE virtual_channel_live_settings ENABLE ROW LEVEL SECURITY;
ALTER TABLE virtual_channel_live_settings FORCE ROW LEVEL SECURITY;

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

GRANT SELECT, INSERT, UPDATE, DELETE ON virtual_channel_imports, virtual_channel_live_settings TO sp_app;