/*
 * This file Copyright (C) 2013-2014 Mnemosyne LLC
 *
 * It may be used under the GNU GPL versions 2 or 3
 * or any future license endorsed by Mnemosyne LLC.
 *
 */

#include "transmission.h"

#include "metainfo.h"
#include "utils.h"

#include "gtest/gtest.h"

#include <array>
#include <cerrno>
#include <cstring>
#include <string_view>

using namespace std::literals;

TEST(Metainfo, magnetLink)
{
    // background info @ http://wiki.theory.org/BitTorrent_Magnet-URI_Webseeding
    char const constexpr* const MagnetLink =
        "magnet:?"
        "xt=urn:btih:14ffe5dd23188fd5cb53a1d47f1289db70abf31e"
        "&dn=ubuntu_12_04_1_desktop_32_bit"
        "&tr=http%3A%2F%2Ftracker.publicbt.com%2Fannounce"
        "&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80"
        "&ws=http%3A%2F%2Ftransmissionbt.com";

    auto* ctor = tr_ctorNew(nullptr);
    tr_ctorSetMetainfoFromMagnetLink(ctor, MagnetLink);
    auto inf = tr_info{};
    auto const parse_result = tr_torrentParse(ctor, &inf);
    EXPECT_EQ(TR_PARSE_OK, parse_result);
    EXPECT_EQ(0, inf.fileCount); // because it's a magnet link
    EXPECT_EQ(2, inf.trackerCount);
    if (inf.trackerCount >= 1)
    {
        EXPECT_STREQ("http://tracker.publicbt.com/announce", inf.trackers[0].announce);
    }
    if (inf.trackerCount >= 2)
    {
        EXPECT_STREQ("udp://tracker.publicbt.com:80", inf.trackers[1].announce);
    }
    EXPECT_EQ(1, inf.webseedCount);
    if (inf.webseedCount >= 1)
    {
        EXPECT_STREQ("http://transmissionbt.com", inf.webseeds[0]);
    }

    auto* const link = tr_torrentInfoGetMagnetLink(&inf);
    EXPECT_STREQ(MagnetLink, link);
    tr_free(link);

    /* cleanup */
    tr_metainfoFree(&inf);
    tr_ctorFree(ctor);
}

#define BEFORE_PATH \
    "d10:created by25:Transmission/2.82 (14160)13:creation datei1402280218e8:encoding5:UTF-84:infod5:filesld6:lengthi2e4:pathl"
#define AFTER_PATH \
    "eed6:lengthi2e4:pathl5:b.txteee4:name3:foo12:piece lengthi32768e6:pieces20:ÞÉ`âM‘‹Šs¡Å;˺¬.åÂà7:privatei0eee"

// FIXME: split these into parameterized tests?
TEST(Metainfo, bucket)
{
    struct LocalTest
    {
        int expected_benc_err;
        int expected_parse_result;
        std::string_view benc;
    };

    auto const tests = std::array<LocalTest, 9>{
        LocalTest{ 0, TR_PARSE_OK, BEFORE_PATH "5:a.txt" AFTER_PATH },

        /* allow empty components, but not =all= empty components, see bug #5517 */
        { 0, TR_PARSE_OK, BEFORE_PATH "0:5:a.txt" AFTER_PATH },
        { 0, TR_PARSE_ERR, BEFORE_PATH "0:0:" AFTER_PATH },

        /* allow path separators in a filename (replaced with '_') */
        { 0, TR_PARSE_OK, BEFORE_PATH "7:a/a.txt" AFTER_PATH },

        /* allow "." components (skipped) */
        { 0, TR_PARSE_OK, BEFORE_PATH "1:.5:a.txt" AFTER_PATH },
        { 0, TR_PARSE_OK, BEFORE_PATH "5:a.txt1:." AFTER_PATH },

        /* allow ".." components (replaced with "__") */
        { 0, TR_PARSE_OK, BEFORE_PATH "2:..5:a.txt" AFTER_PATH },
        { 0, TR_PARSE_OK, BEFORE_PATH "5:a.txt2:.." AFTER_PATH },

        /* fail on empty string */
        { EILSEQ, TR_PARSE_ERR, "" },
    };

    tr_logSetLevel(TR_LOG_SILENT);

    for (auto const& test : tests)
    {
        auto* ctor = tr_ctorNew(nullptr);
        int const err = tr_ctorSetMetainfo(ctor, std::data(test.benc), std::size(test.benc));
        EXPECT_EQ(test.expected_benc_err, err);

        if (err == 0)
        {
            tr_parse_result const parse_result = tr_torrentParse(ctor, nullptr);
            EXPECT_EQ(test.expected_parse_result, parse_result);
        }

        tr_ctorFree(ctor);
    }
}

TEST(Metainfo, sanitize)
{
    struct LocalTest
    {
        std::string_view input;
        std::string_view expected_output;
        bool expected_is_adjusted;
    };

    auto const tests = std::array<LocalTest, 29>{
        // skipped
        LocalTest{ ""sv, ""sv, false },
        { "."sv, ""sv, true },
        { ".."sv, ""sv, true },
        { "....."sv, ""sv, true },
        { "  "sv, ""sv, true },
        { " . "sv, ""sv, true },
        { ". . ."sv, ""sv, true },
        // replaced with '_'
        { "/"sv, "_"sv, true },
        { "////"sv, "____"sv, true },
        { "\\\\"sv, "__"sv, true },
        { "/../"sv, "_.._"sv, true },
        { "foo<bar:baz/boo"sv, "foo_bar_baz_boo"sv, true },
        { "t\0e\x01s\tt\ri\nn\fg"sv, "t_e_s_t_i_n_g"sv, true },
        // appended with '_'
        { "con"sv, "con_"sv, true },
        { "cOm4"sv, "cOm4_"sv, true },
        { "LPt9.txt"sv, "LPt9_.txt"sv, true },
        { "NUL.tar.gz"sv, "NUL_.tar.gz"sv, true },
        // trimmed
        { " foo"sv, "foo"sv, true },
        { "foo "sv, "foo"sv, true },
        { " foo "sv, "foo"sv, true },
        { "foo."sv, "foo"sv, true },
        { "foo..."sv, "foo"sv, true },
        { " foo... "sv, "foo"sv, true },
        // unmodified
        { "foo"sv, "foo"sv, false },
        { ".foo"sv, ".foo"sv, false },
        { "..foo"sv, "..foo"sv, false },
        { "foo.bar.baz"sv, "foo.bar.baz"sv, false },
        { "null"sv, "null"sv, false },
        { "compass"sv, "compass"sv, false },
    };

    auto out = std::string{};
    auto is_adjusted = bool{};
    for (auto const& test : tests)
    {
        out.clear();
        auto const success = tr_metainfoAppendSanitizedPathComponent(out, test.input, &is_adjusted);
        EXPECT_EQ(!std::empty(out), success);
        EXPECT_EQ(test.expected_output, out);
        EXPECT_EQ(test.expected_is_adjusted, is_adjusted);
    }
}

TEST(Metainfo, AndroidTorrent)
{
    auto* ctor = tr_ctorNew(nullptr);

    auto filename = std::string{ LIBTRANSMISSION_TEST_ASSETS_DIR };
    filename += '/'; // FIXME
    filename += "Android-x86 8.1 r6 iso.torrent";
    auto const err = tr_ctorSetMetainfoFromFile(ctor, filename.c_str());
    EXPECT_EQ(0, err);

    tr_ctorFree(ctor);
}