#pragma once
#include "db_gateway.hpp"
#include <nlohmann/json.hpp>
#include <optional>
#include <string>
#include <vector>

namespace svapi {

/// Metadata describing a managed collection.
struct CollectionMeta {
    std::string name;
    std::string kind;
    uint32_t    vectorDimension = 0;
    std::string embeddingModel;
    uint64_t    createdAt = 0;

    static CollectionMeta fromJson(const nlohmann::json&);
    nlohmann::json toJson() const;
};

/// Project-scoped registry: one document per managed collection stored in
/// qualify(project, "vectorapi_collections").
class CollectionRegistry {
public:
    explicit CollectionRegistry(DbGateway& db);

    /// Ensure the registry collection for `project` exists (idempotent).
    void ensure(const std::string& project);

    /// Add (or overwrite) a collection entry.  Returns true on success.
    bool add(const std::string& project, const CollectionMeta& meta);

    /// Look up a single collection entry by name.
    std::optional<CollectionMeta> get(const std::string& project, const std::string& name);

    /// List all collection entries for the project.
    std::vector<CollectionMeta> list(const std::string& project);

    /// Remove a collection entry.  Returns true if the document was present.
    bool remove(const std::string& project, const std::string& name);

private:
    DbGateway& db_;

    /// Qualified registry collection name for the given project.
    std::string coll(const std::string& project) const {
        return qualify(project, "vectorapi_collections");
    }
};

} // namespace svapi