/* We define our own uuid generator function that uses gen_random_uuid() underneath.
Since the column default is not directly referencing gen_random_uuid(),
it prevents the column default to be dropped when pgcrypto or public schema is dropped unwittingly.

See https://github.com/hasura/graphql-engine/issues/4217

There is another instance of this function, defined in `init_pg_source.sql`. We
need to define them in both places because the `gen_hasura_uuid` function is
used as column defaults for various tables stored in both the metadata database
and the event log table in user's (source) database. In the case where the
metadata database is separate from the source database, we need to create these
functions separately. Note that both of these definitions have to be the same.
*/
CREATE OR REPLACE FUNCTION hdb_catalog.gen_hasura_uuid() RETURNS uuid AS
-- We assume gen_random_uuid() is available in the search_path.
-- This may not be true but we can't do much till https://github.com/hasura/graphql-engine/issues/3657
'select gen_random_uuid()' LANGUAGE SQL;

CREATE TABLE hdb_catalog.hdb_version (
    hasura_uuid UUID PRIMARY KEY DEFAULT hdb_catalog.gen_hasura_uuid(),
    version TEXT NOT NULL,
    upgraded_on TIMESTAMPTZ NOT NULL,
    cli_state JSONB NOT NULL DEFAULT '{}'::jsonb,
    console_state JSONB NOT NULL DEFAULT '{}'::jsonb
);

CREATE UNIQUE INDEX hdb_version_one_row
ON hdb_catalog.hdb_version((version IS NOT NULL));

-- Create table which stores metadata JSON blob
CREATE TABLE hdb_catalog.hdb_metadata
(
  id INTEGER PRIMARY KEY,
  metadata JSON NOT NULL,
  resource_version INTEGER NOT NULL DEFAULT 1 UNIQUE
);

CREATE TABLE hdb_catalog.hdb_action_log
(
  id UUID PRIMARY KEY DEFAULT hdb_catalog.gen_hasura_uuid(),
  -- we deliberately do not reference the action name
  -- because sometimes we may want to retain history
  -- after dropping the action
  action_name TEXT,
  input_payload JSONB NOT NULL,
  request_headers JSONB NOT NULL,
  session_variables JSONB NOT NULL,
  response_payload JSONB NULL,
  errors JSONB NULL,
  created_at timestamptz NOT NULL default now(),
  response_received_at timestamptz NULL,
  status text NOT NULL,
  CHECK (status IN ('created', 'processing', 'completed', 'error'))
);

CREATE TABLE hdb_catalog.hdb_cron_events
(
  id TEXT DEFAULT hdb_catalog.gen_hasura_uuid() PRIMARY KEY,
  trigger_name TEXT NOT NULL,
  scheduled_time TIMESTAMPTZ NOT NULL,
  status TEXT NOT NULL DEFAULT 'scheduled',
  tries INTEGER NOT NULL DEFAULT 0,
  created_at TIMESTAMPTZ DEFAULT NOW(),
  next_retry_at TIMESTAMPTZ,

  CONSTRAINT valid_status CHECK (status IN ('scheduled','locked','delivered','error','dead'))
);

CREATE INDEX hdb_cron_event_status ON hdb_catalog.hdb_cron_events (status);

CREATE UNIQUE INDEX hdb_cron_events_unique_scheduled ON
hdb_catalog.hdb_cron_events (trigger_name, scheduled_time)
where status = 'scheduled';

CREATE TABLE hdb_catalog.hdb_cron_event_invocation_logs
(
  id TEXT DEFAULT hdb_catalog.gen_hasura_uuid() PRIMARY KEY,
  event_id TEXT,
  status INTEGER,
  request JSON,
  response JSON,
  created_at TIMESTAMPTZ DEFAULT NOW(),

  FOREIGN KEY (event_id) REFERENCES hdb_catalog.hdb_cron_events (id)
    ON UPDATE CASCADE ON DELETE CASCADE
);

CREATE INDEX hdb_cron_event_invocation_event_id ON hdb_catalog.hdb_cron_event_invocation_logs (event_id);

CREATE TABLE hdb_catalog.hdb_scheduled_events
(
  id TEXT DEFAULT hdb_catalog.gen_hasura_uuid() PRIMARY KEY,
  webhook_conf JSON NOT NULL,
  scheduled_time TIMESTAMPTZ NOT NULL,
  retry_conf JSON,
  payload JSON,
  header_conf JSON,
  status TEXT NOT NULL DEFAULT 'scheduled',
  tries INTEGER NOT NULL DEFAULT 0,
  created_at TIMESTAMPTZ DEFAULT NOW(),
  next_retry_at TIMESTAMPTZ,
  comment TEXT,
  CONSTRAINT valid_status CHECK (status IN ('scheduled','locked','delivered','error','dead'))
);

CREATE INDEX hdb_scheduled_event_status ON hdb_catalog.hdb_scheduled_events (status);

CREATE TABLE hdb_catalog.hdb_scheduled_event_invocation_logs
(
  id TEXT DEFAULT hdb_catalog.gen_hasura_uuid() PRIMARY KEY,
  event_id TEXT,
  status INTEGER,
  request JSON,
  response JSON,
  created_at TIMESTAMPTZ DEFAULT NOW(),

  FOREIGN KEY (event_id) REFERENCES hdb_catalog.hdb_scheduled_events (id)
     ON DELETE CASCADE ON UPDATE CASCADE
);

-- NOTE: In OSS this table only contains a single row (indicated by ID 1).
--       This may change to allow multiple notifications in future.
CREATE TABLE hdb_catalog.hdb_schema_notifications
(
  id INTEGER PRIMARY KEY CHECK (id = 1),
  notification JSON NOT NULL,
  resource_version INTEGER NOT NULL DEFAULT 1,
  instance_id UUID NOT NULL,
  updated_at TIMESTAMPTZ DEFAULT NOW()
);