-- Bell owns Area and capture-policy truth. Sense records only the highest
-- projection version it has observed and the version used for admission.

CREATE TABLE IF NOT EXISTS bell.areas (
    tenant_id text NOT NULL,
    site_id text NOT NULL,
    id text NOT NULL,
    name text NOT NULL,
    capture_policy text NOT NULL DEFAULT 'video_allowed',
    version bigint NOT NULL DEFAULT 1,
    created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
    updated_at timestamptz NOT NULL DEFAULT clock_timestamp(),
    deleted_at timestamptz,
    PRIMARY KEY (tenant_id, id),
    CONSTRAINT bell_areas_site_fk FOREIGN KEY (tenant_id, site_id)
        REFERENCES bell.sites(tenant_id, id),
    CONSTRAINT bell_areas_capture_policy CHECK (
        capture_policy IN ('video_allowed', 'non_imaging_only')
    ),
    CONSTRAINT bell_areas_version_positive CHECK (version >= 1),
    CONSTRAINT bell_areas_identity_not_blank CHECK (
        btrim(tenant_id) <> '' AND btrim(site_id) <> ''
        AND btrim(id) <> '' AND btrim(name) <> ''
    )
);
ALTER TABLE bell.areas OWNER TO bell_app;

CREATE OR REPLACE FUNCTION bell.bump_area_version()
RETURNS trigger
LANGUAGE plpgsql
SECURITY INVOKER
SET search_path = pg_catalog, bell
AS $function$
BEGIN
    IF NEW.tenant_id IS DISTINCT FROM OLD.tenant_id
       OR NEW.site_id IS DISTINCT FROM OLD.site_id
       OR NEW.id IS DISTINCT FROM OLD.id THEN
        RAISE EXCEPTION 'Bell Area identity and Site are immutable';
    END IF;
    NEW.version := OLD.version + 1;
    NEW.updated_at := clock_timestamp();
    RETURN NEW;
END
$function$;
ALTER FUNCTION bell.bump_area_version() OWNER TO bell_app;

DROP TRIGGER IF EXISTS bell_areas_bump_version ON bell.areas;
CREATE TRIGGER bell_areas_bump_version
BEFORE UPDATE ON bell.areas
FOR EACH ROW EXECUTE FUNCTION bell.bump_area_version();

CREATE OR REPLACE VIEW bell.area_policy_v1 (
    tenant_id,
    site_id,
    area_id,
    capture_policy,
    source_version,
    source_updated_at
) AS
SELECT
    area.tenant_id,
    area.site_id,
    area.id,
    area.capture_policy,
    area.version,
    area.updated_at
FROM bell.areas AS area
JOIN bell.sites AS site
  ON site.tenant_id = area.tenant_id AND site.id = area.site_id
WHERE area.deleted_at IS NULL AND site.deleted_at IS NULL;
ALTER VIEW bell.area_policy_v1 OWNER TO bell_app;
COMMENT ON VIEW bell.area_policy_v1 IS
    'v1 read-only Area capture-policy projection owned by Bell and consumed by Sense';

ALTER TABLE sense.devices ADD COLUMN IF NOT EXISTS area_id text;
ALTER TABLE sense.devices ADD COLUMN IF NOT EXISTS area_policy_source_version bigint;

DO $constraints$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conrelid = 'sense.devices'::regclass
          AND conname = 'sense_devices_area_not_blank'
    ) THEN
        ALTER TABLE sense.devices ADD CONSTRAINT sense_devices_area_not_blank
            CHECK (area_id IS NULL OR btrim(area_id) <> '');
    END IF;
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conrelid = 'sense.devices'::regclass
          AND conname = 'sense_devices_area_version_positive'
    ) THEN
        ALTER TABLE sense.devices ADD CONSTRAINT sense_devices_area_version_positive
            CHECK (area_policy_source_version IS NULL OR area_policy_source_version >= 1);
    END IF;
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conrelid = 'sense.devices'::regclass
          AND conname = 'sense_devices_tenant_site_id_unique'
    ) THEN
        ALTER TABLE sense.devices ADD CONSTRAINT sense_devices_tenant_site_id_unique
            UNIQUE (tenant_id, site_id, id);
    END IF;
END
$constraints$;

CREATE TABLE IF NOT EXISTS sense.area_policy_projection_state (
    tenant_id text NOT NULL,
    site_id text NOT NULL,
    area_id text NOT NULL,
    source_version bigint NOT NULL,
    synced_at timestamptz NOT NULL,
    PRIMARY KEY (tenant_id, site_id, area_id),
    CONSTRAINT sense_area_projection_identity_not_blank CHECK (
        btrim(tenant_id) <> '' AND btrim(site_id) <> '' AND btrim(area_id) <> ''
    ),
    CONSTRAINT sense_area_projection_version_positive CHECK (source_version >= 1)
);
ALTER TABLE sense.area_policy_projection_state OWNER TO sense_app;

CREATE INDEX IF NOT EXISTS sense_devices_area_idx
    ON sense.devices(tenant_id, site_id, area_id);

INSERT INTO bell.schema_migrations(version) VALUES (2)
ON CONFLICT (version) DO NOTHING;
INSERT INTO sense.schema_migrations(version) VALUES (2)
ON CONFLICT (version) DO NOTHING;