// Copyright (c) 2019, QuantStack and Mamba Contributors
//
// Distributed under the terms of the BSD 3-Clause License.
//
// The full license is in the file LICENSE, distributed with this software.

#ifndef MAMBA_CORE_CHANNEL_HPP
#define MAMBA_CORE_CHANNEL_HPP

#include <map>
#include <optional>
#include <string>
#include <utility>
#include <vector>

#include "mamba/core/package_cache.hpp"
#include "mamba/core/validate.hpp"

namespace mamba
{
    class Channel
    {
    public:

        const std::string& scheme() const;
        const std::string& location() const;
        const std::string& name() const;
        const std::vector<std::string>& platforms() const;
        const std::optional<std::string>& auth() const;
        const std::optional<std::string>& token() const;
        const std::optional<std::string>& package_filename() const;
        const std::string& canonical_name() const;
        const validation::RepoChecker& repo_checker(MultiPackageCache& caches) const;

        std::string base_url() const;
        std::string platform_url(std::string platform, bool with_credential = true) const;
        // The pairs consist of (platform,url)
        std::vector<std::pair<std::string, std::string>>
        platform_urls(bool with_credential = true) const;
        std::vector<std::string> urls(bool with_credential = true) const;

    private:

        Channel(
            const std::string& scheme,
            const std::string& location,
            const std::string& name,
            const std::optional<std::string>& auth = {},
            const std::optional<std::string>& token = {},
            const std::optional<std::string>& package_filename = {},
            const std::optional<std::string>& canonical_name = {}
        );

        std::string m_scheme;
        std::string m_location;
        std::string m_name;
        std::vector<std::string> m_platforms;
        std::optional<std::string> m_auth;
        std::optional<std::string> m_token;
        std::optional<std::string> m_package_filename;
        mutable std::optional<std::string> m_canonical_name;
        mutable std::unique_ptr<validation::RepoChecker> p_repo_checker;

        friend class ChannelBuilder;
    };

    bool operator==(const Channel& lhs, const Channel& rhs);
    bool operator!=(const Channel& lhs, const Channel& rhs);

    const Channel& make_channel(const std::string& value);
    std::vector<const Channel*> get_channels(const std::vector<std::string>& channel_names);

    void check_whitelist(const std::vector<std::string>& urls);
}  // namespace mamba

#endif