/* Copyright (C) CJ Affiliate
 *
 * You may use, distribute and modify this code under  the
 * terms of the  GNU General Public License  version 2  or
 * later.
 *
 * You should have received a copy of the license with this
 * file. If not, you will find a copy in the "LICENSE" file
 * at https://github.com/cjdev/dual-control.
 */

#include <memory>
#include <cstring>
#include <pwd.h>
#include <cstdio>
#include <sys/stat.h>
#include <fstream>
#include <sstream>

#include "token.h"
#include "test_util.h"
#include "user.h"
#include "sys_fstream.h"
#include "generator.h"

class fake_user : public user_ifc
{
private:
    std::string home_directory_;
public:
    fake_user() {}
    fake_user (const std::string &home_directory) :
        home_directory_ (home_directory)
    {
    }
    std::string home_directory() const override
    {
        return home_directory_;
    }
};

class mock_write_fstreams: public fstreams_ifc
{
private:
    mutable std::string captured_filename_;
    mutable std::shared_ptr<std::ostringstream> capture_stream_;
public:
    postream open_ofstream (const std::string &file_path,
                            std::ios_base::openmode mode) const override
    {
        captured_filename_ = file_path;
        capture_stream_ = std::make_shared<std::ostringstream>();
        return capture_stream_;
    }
    std::string captured_filename()
    {
        return captured_filename_;
    }
    std::string captured_written()
    {
        return capture_stream_->str();
    }
};

class fake_fstreams : public fstreams_ifc
{
private:
    std::string expected_file_path_;
    std::string file_contents_;
public:
    fake_fstreams (const std::string &expected_file_path,
                   const std::string &file_contents)
        : expected_file_path_ (expected_file_path),
          file_contents_ (file_contents) {}
    pstream open_fstream (const std::string &file_path) const override
    {
        if (file_path == expected_file_path_) {
            return fstreams::pstream (new std::istringstream (file_contents_));
        } else {
            return fstreams_ifc::open_fstream (file_path);
        }

    }
};

class fake_totp_generator : public token_generator_ifc
{
private:
    std::string expected_token = "<unspecified>";
    std::string key = "<unset>";
public:
    std::string generate_token (const std::string &key) const override {
        return expected_token;
    }
};

int reads_from_the_right_file ()
{
    //given
    std::string home_directory = "/somedir";
    // hardcoded file name is .dual_control in the user's home directory
    std::string token_file = home_directory + "/.dual_control";
    std::string token ("123456");
    fstreams test_streams (fstreams::delegate (new fake_fstreams (token_file,
                           token)));
    totp_generator generator (totp_generator::delegate (new fake_totp_generator ()));

    //file_reader test_file_reader (file_reader::delegate (new fake_file_reader));
    user test_user (user::delegate (new fake_user (home_directory)));
    tokens supplier (tokens::create (test_streams, generator));

    //when
    std::string actual = supplier.token (test_user);

    //then
    check (actual == token, "token does not match");
    succeed();
}

int returns_empty_string_if_file_open_fail()
{
    //given
    std::string home_directory = "/somedir";
    // hardcoded file name is .dual_control in the user's home directory
    std::string token_file = home_directory + "/.not_dual_control";
    fstreams test_streams (fstreams::delegate (new fake_fstreams (token_file,
                           "654321")));
    totp_generator generator (totp_generator::delegate (new fake_totp_generator ()));

    user test_user (user::delegate (new fake_user (home_directory)));
    tokens supplier (tokens::create (test_streams, generator));

    //when
    std::string actual = supplier.token (test_user);

    //then
    check (actual == "", "should have returned empty string");
    succeed();
}

int writes_the_token ()
{
    // given
    std::string home_directory ("/somedir");
    user test_user (user::delegate (new fake_user (home_directory)));
    mock_write_fstreams *mockfs (new mock_write_fstreams);
    fstreams test_streams{fstreams::delegate (mockfs)};
    totp_generator generator (totp_generator::delegate (new fake_totp_generator ()));
    std::string token ("token");
    tokens tokens (tokens::create (test_streams, generator));

    //when
    tokens.save (test_user, token);

    // then
    std::ostringstream temp;
    temp << token << std::endl;
    std::string expected_written = temp.str();
    std::string expected_filename (home_directory + "/.dual_control");
    check (mockfs->captured_filename() == expected_filename,
           "filename does not match");
    check (mockfs->captured_written() == expected_written,
           "token does not match");
    succeed();
}

int run_tests()
{
    // test (reads_from_the_right_file);
    // test (returns_empty_string_if_file_open_fail);
    // test (writes_the_token);
    succeed();
}

int main (int argc, char *argv[])
{
    return !run_tests();
}