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// 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_TRANSACTION_CONTEXT
#define MAMBA_CORE_TRANSACTION_CONTEXT

#include <string>

#include <reproc++/reproc.hpp>

#include "mamba/core/context.hpp"
#include "mamba/core/util.hpp"
#include "mamba/fs/filesystem.hpp"
#include "mamba/specs/match_spec.hpp"

namespace mamba
{
    std::string compute_short_python_version(const std::string& long_version);
    // supply short python version, e.g. 2.7, 3.5...
    fs::u8path get_python_short_path(const std::string& python_version);
    fs::u8path get_python_site_packages_short_path(const std::string& python_version);
    fs::u8path get_bin_directory_short_path();
    fs::u8path get_python_noarch_target_path(
        const std::string& source_short_path,
        const fs::u8path& target_site_packages_short_path
    );

    class TransactionContext
    {
    public:

        TransactionContext();
        TransactionContext(TransactionContext&&) = default;

        explicit TransactionContext(const Context& context);

        TransactionContext& operator=(TransactionContext&&) = default;

        TransactionContext(
            const Context& context,
            const fs::u8path& target_prefix,
            const std::pair<std::string, std::string>& py_versions,
            std::vector<specs::MatchSpec> requested_specs
        );

        TransactionContext(
            const Context& context,
            const fs::u8path& target_prefix,
            const fs::u8path& relocate_prefix,
            const std::pair<std::string, std::string>& py_versions,
            std::vector<specs::MatchSpec> requested_specs
        );
        ~TransactionContext();
        bool try_pyc_compilation(const std::vector<fs::u8path>& py_files);
        void wait_for_pyc_compilation();

        bool has_python = false;
        fs::u8path target_prefix;
        fs::u8path relocate_prefix;
        fs::u8path site_packages_path;
        fs::u8path python_path;
        std::string python_version;
        std::string old_python_version;
        std::string short_python_version;
        bool allow_softlinks = false;
        bool always_copy = false;
        bool always_softlink = false;
        bool compile_pyc = true;
        // this needs to be done when python version changes
        std::vector<specs::MatchSpec> requested_specs;

        const Context& context() const
        {
            return *m_context;
        }

    private:

        bool start_pyc_compilation_process();

        std::unique_ptr<reproc::process> m_pyc_process = nullptr;
        std::unique_ptr<TemporaryFile> m_pyc_script_file = nullptr;
        std::unique_ptr<TemporaryFile> m_pyc_compileall = nullptr;

        const Context* m_context = nullptr;  // TODO: replace by a struct with the necessary params.

        void throw_if_not_ready() const;
    };
}  // namespace mamba

#endif