--
-- Copyright © 2016-2020 The Thingsboard Authors
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--

CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;

CREATE TABLE IF NOT EXISTS ts_kv (
    entity_id uuid NOT NULL,
    key int NOT NULL,
    ts bigint NOT NULL,
    bool_v boolean,
    str_v varchar(10000000),
    long_v bigint,
    dbl_v double precision,
    json_v json,
    CONSTRAINT ts_kv_pkey PRIMARY KEY (entity_id, key, ts)
);

CREATE TABLE IF NOT EXISTS ts_kv_dictionary (
    key varchar(255) NOT NULL,
    key_id serial UNIQUE,
    CONSTRAINT ts_key_id_pkey PRIMARY KEY (key)
);

CREATE TABLE IF NOT EXISTS ts_kv_latest (
    entity_id uuid NOT NULL,
    key int NOT NULL,
    ts bigint NOT NULL,
    bool_v boolean,
    str_v varchar(10000000),
    long_v bigint,
    dbl_v double precision,
    json_v json,
    CONSTRAINT ts_kv_latest_pkey PRIMARY KEY (entity_id, key)
);

CREATE TABLE IF NOT EXISTS tb_schema_settings
(
    schema_version bigint NOT NULL,
    CONSTRAINT tb_schema_settings_pkey PRIMARY KEY (schema_version)
);

INSERT INTO tb_schema_settings (schema_version) VALUES (2005001) ON CONFLICT (schema_version) DO UPDATE SET schema_version = 2005001;

CREATE OR REPLACE FUNCTION to_uuid(IN entity_id varchar, OUT uuid_id uuid) AS
$$
BEGIN
    uuid_id := substring(entity_id, 8, 8) || '-' || substring(entity_id, 4, 4) || '-1' || substring(entity_id, 1, 3) ||
               '-' || substring(entity_id, 16, 4) || '-' || substring(entity_id, 20, 12);
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION delete_device_records_from_ts_kv(tenant_id varchar, customer_id varchar, ttl bigint,
                                                            OUT deleted bigint) AS
$$
BEGIN
    EXECUTE format(
            'WITH deleted AS (DELETE FROM ts_kv WHERE entity_id IN (SELECT to_uuid(device.id) as entity_id FROM device WHERE tenant_id = %L and customer_id = %L) AND ts < %L::bigint RETURNING *) SELECT count(*) FROM deleted',
            tenant_id, customer_id, ttl) into deleted;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION delete_asset_records_from_ts_kv(tenant_id varchar, customer_id varchar, ttl bigint,
                                                           OUT deleted bigint) AS
$$
BEGIN
    EXECUTE format(
            'WITH deleted AS (DELETE FROM ts_kv WHERE entity_id IN (SELECT to_uuid(asset.id) as entity_id FROM asset WHERE tenant_id = %L and customer_id = %L) AND ts < %L::bigint RETURNING *) SELECT count(*) FROM deleted',
            tenant_id, customer_id, ttl) into deleted;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE FUNCTION delete_customer_records_from_ts_kv(tenant_id varchar, customer_id varchar, ttl bigint,
                                                              OUT deleted bigint) AS
$$
BEGIN
    EXECUTE format(
            'WITH deleted AS (DELETE FROM ts_kv WHERE entity_id IN (SELECT to_uuid(customer.id) as entity_id FROM customer WHERE tenant_id = %L and id = %L) AND ts < %L::bigint RETURNING *) SELECT count(*) FROM deleted',
            tenant_id, customer_id, ttl) into deleted;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE PROCEDURE cleanup_timeseries_by_ttl(IN null_uuid varchar(31),
                                                      IN system_ttl bigint, INOUT deleted bigint)
    LANGUAGE plpgsql AS
$$
DECLARE
    tenant_cursor CURSOR FOR select tenant.id as tenant_id
                             from tenant;
    tenant_id_record     varchar;
    customer_id_record   varchar;
    tenant_ttl           bigint;
    customer_ttl         bigint;
    deleted_for_entities bigint;
    tenant_ttl_ts        bigint;
    customer_ttl_ts      bigint;
BEGIN
    OPEN tenant_cursor;
    FETCH tenant_cursor INTO tenant_id_record;
    WHILE FOUND
        LOOP
            EXECUTE format(
                    'select attribute_kv.long_v from attribute_kv where attribute_kv.entity_id = %L and attribute_kv.attribute_key = %L',
                    tenant_id_record, 'TTL') INTO tenant_ttl;
            if tenant_ttl IS NULL THEN
                tenant_ttl := system_ttl;
            END IF;
            IF tenant_ttl > 0 THEN
                tenant_ttl_ts := (EXTRACT(EPOCH FROM current_timestamp) * 1000 - tenant_ttl::bigint * 1000)::bigint;
                deleted_for_entities := delete_device_records_from_ts_kv(tenant_id_record, null_uuid, tenant_ttl_ts);
                deleted := deleted + deleted_for_entities;
                RAISE NOTICE '% telemetry removed for devices where tenant_id = %', deleted_for_entities, tenant_id_record;
                deleted_for_entities := delete_asset_records_from_ts_kv(tenant_id_record, null_uuid, tenant_ttl_ts);
                deleted := deleted + deleted_for_entities;
                RAISE NOTICE '% telemetry removed for assets where tenant_id = %', deleted_for_entities, tenant_id_record;
            END IF;
            FOR customer_id_record IN
                SELECT customer.id AS customer_id FROM customer WHERE customer.tenant_id = tenant_id_record
                LOOP
                    EXECUTE format(
                            'select attribute_kv.long_v from attribute_kv where attribute_kv.entity_id = %L and attribute_kv.attribute_key = %L',
                            customer_id_record, 'TTL') INTO customer_ttl;
                    IF customer_ttl IS NULL THEN
                        customer_ttl_ts := tenant_ttl_ts;
                    ELSE
                        IF customer_ttl > 0 THEN
                            customer_ttl_ts :=
                                    (EXTRACT(EPOCH FROM current_timestamp) * 1000 -
                                     customer_ttl::bigint * 1000)::bigint;
                        END IF;
                    END IF;
                    IF customer_ttl_ts IS NOT NULL AND customer_ttl_ts > 0 THEN
                        deleted_for_entities :=
                                delete_customer_records_from_ts_kv(tenant_id_record, customer_id_record,
                                                                   customer_ttl_ts);
                        deleted := deleted + deleted_for_entities;
                        RAISE NOTICE '% telemetry removed for customer with id = % where tenant_id = %', deleted_for_entities, customer_id_record, tenant_id_record;
                        deleted_for_entities :=
                                delete_device_records_from_ts_kv(tenant_id_record, customer_id_record,
                                                                 customer_ttl_ts);
                        deleted := deleted + deleted_for_entities;
                        RAISE NOTICE '% telemetry removed for devices where tenant_id = % and customer_id = %', deleted_for_entities, tenant_id_record, customer_id_record;
                        deleted_for_entities := delete_asset_records_from_ts_kv(tenant_id_record,
                                                                                customer_id_record,
                                                                                customer_ttl_ts);
                        deleted := deleted + deleted_for_entities;
                        RAISE NOTICE '% telemetry removed for assets where tenant_id = % and customer_id = %', deleted_for_entities, tenant_id_record, customer_id_record;
                    END IF;
                END LOOP;
            FETCH tenant_cursor INTO tenant_id_record;
        END LOOP;
END
$$;