drop function :GRAPHILE_WORKER_SCHEMA.add_job(text, json, text, timestamptz, int, text);

-- graphile-worker-rs:statement

create function :GRAPHILE_WORKER_SCHEMA.add_job(
    identifier text,
    payload json = null,
    queue_name text = null,
    run_at timestamptz = null,
    max_attempts int = null,
    job_key text = null,
    priority int = null
) returns :GRAPHILE_WORKER_SCHEMA.jobs as $$
declare
    v_job :GRAPHILE_WORKER_SCHEMA.jobs;
begin
    -- Apply rationality checks
    if length(identifier) > 128 then
        raise exception 'Task identifier is too long (max length: 128).' using errcode = 'GWBID';
    end if;
    if queue_name is not null and length(queue_name) > 128 then
        raise exception 'Job queue name is too long (max length: 128).' using errcode = 'GWBQN';
    end if;
    if job_key is not null and length(job_key) > 512 then
        raise exception 'Job key is too long (max length: 512).' using errcode = 'GWBJK';
    end if;
    if max_attempts < 1 then
        raise exception 'Job maximum attempts must be at least 1' using errcode = 'GWBMA';
    end if;

    if job_key is not null then
        -- Upsert job
        insert into :GRAPHILE_WORKER_SCHEMA.jobs (
            task_identifier,
            payload,
            queue_name,
            run_at,
            max_attempts,
            key,
            priority
        )
            values(
                identifier,
                coalesce(payload, '{}'::json),
                queue_name,
                coalesce(run_at, now()),
                coalesce(max_attempts, 25),
                job_key,
                coalesce(priority, 0)
            )
            on conflict (key) do update set
                task_identifier=excluded.task_identifier,
                payload=excluded.payload,
                queue_name=excluded.queue_name,
                max_attempts=excluded.max_attempts,
                run_at=excluded.run_at,
                priority=excluded.priority,

                -- always reset error/retry state
                attempts=0,
                last_error=null
            where jobs.locked_at is null
            returning *
            into v_job;

        -- If upsert succeeded (insert or update), return early
        if not (v_job is null) then
            return v_job;
        end if;

        -- Upsert failed -> there must be an existing job that is locked. Remove
        -- existing key to allow a new one to be inserted, and prevent any
        -- subsequent retries by bumping attempts to the max allowed.
        update :GRAPHILE_WORKER_SCHEMA.jobs
            set
                key = null,
                attempts = jobs.max_attempts
            where key = job_key;
    end if;

    -- insert the new job. Assume no conflicts due to the update above
    insert into :GRAPHILE_WORKER_SCHEMA.jobs(
        task_identifier,
        payload,
        queue_name,
        run_at,
        max_attempts,
        key,
        priority
    )
        values(
            identifier,
            coalesce(payload, '{}'::json),
            queue_name,
            coalesce(run_at, now()),
            coalesce(max_attempts, 25),
            job_key,
            coalesce(priority, 0)
        )
        returning *
        into v_job;

    return v_job;
end;
$$ language plpgsql volatile;

-- graphile-worker-rs:statement

create function :GRAPHILE_WORKER_SCHEMA.complete_jobs(
    job_ids bigint[]
) returns setof :GRAPHILE_WORKER_SCHEMA.jobs as $$
    delete from :GRAPHILE_WORKER_SCHEMA.jobs
        where id = any(job_ids)
        and (
            locked_by is null
            or
            locked_at < NOW() - interval '4 hours'
        )
        returning *;
$$ language sql volatile;

-- graphile-worker-rs:statement

create function :GRAPHILE_WORKER_SCHEMA.permanently_fail_jobs(
    job_ids bigint[],
    error_message text = null
) returns setof :GRAPHILE_WORKER_SCHEMA.jobs as $$
    update :GRAPHILE_WORKER_SCHEMA.jobs
        set
            last_error = coalesce(error_message, 'Manually marked as failed'),
            attempts = max_attempts
        where id = any(job_ids)
        and (
            locked_by is null
            or
            locked_at < NOW() - interval '4 hours'
        )
        returning *;
$$ language sql volatile;

-- graphile-worker-rs:statement

create function :GRAPHILE_WORKER_SCHEMA.reschedule_jobs(
    job_ids bigint[],
    run_at timestamptz = null,
    priority int = null,
    attempts int = null,
    max_attempts int = null
) returns setof :GRAPHILE_WORKER_SCHEMA.jobs as $$
    update :GRAPHILE_WORKER_SCHEMA.jobs
        set
            run_at = coalesce(reschedule_jobs.run_at, jobs.run_at),
            priority = coalesce(reschedule_jobs.priority, jobs.priority),
            attempts = coalesce(reschedule_jobs.attempts, jobs.attempts),
            max_attempts = coalesce(reschedule_jobs.max_attempts, jobs.max_attempts)
        where id = any(job_ids)
        and (
            locked_by is null
            or
            locked_at < NOW() - interval '4 hours'
        )
        returning *;
$$ language sql volatile;
