#pragma once

// Read access to the `queues` table, projected onto proto::Queue. taskIds is derived from
// `tasks` (queue_id = this queue, ordered by queue_position), not stored on the queue row
// — membership changes through download.update / queue.reorder, per Queue's own schema
// note that a queue.upsert payload's taskIds is ignored.

#include <optional>
#include <string_view>
#include <vector>

#include "store/sqlite.hpp"
#include "velox_proto.hpp"

namespace velox::daemon::store {

class Queues {
public:
    explicit Queues(Db& db) : db_(db) {}

    DbResult<std::vector<velox::proto::Queue>> list();

    // nullopt (not an error) if no queue has this id.
    DbResult<std::optional<velox::proto::Queue>> get(std::string_view queue_id);

    // 'running' or 'stopped' (Queue.schema.json / the state column's CHECK). false if the
    // id doesn't exist.
    DbResult<bool> set_state(std::string_view queue_id, std::string_view state);

    // schedule.set: nullopt clears it (NULL = manual control, per the schema's own
    // words). false if the queue doesn't exist.
    DbResult<bool> set_schedule(std::string_view queue_id,
                                const std::optional<velox::proto::Schedule>& schedule);

    // queue.reorder: `task_ids` must be an exact permutation of the queue's current
    // membership (the schema's own words — "anything else is -32602 rather than a
    // partial reorder, so a stale drag from an out-of-date view cannot quietly reshuffle
    // the queue"). false (no write at all) if it isn't; true and queue_position rewritten
    // to match `task_ids`'s order if it is.
    DbResult<bool> reorder(std::string_view queue_id, const std::vector<std::string>& task_ids);

    // "Omit queueId to create" (queue.upsert's own words) — an empty id generates one.
    // taskIds is ignored (membership changes only through download.update / queue.reorder,
    // per the schema's own note); a create defaults to 'stopped', a replace keeps the
    // queue's current run state (queue.upsert edits config, not run state).
    DbResult<velox::proto::Queue> upsert(velox::proto::Queue queue);

private:
    Db& db_;
};

}  // namespace velox::daemon::store