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#include "generator.h"
#include <stdexcept>
#include <iostream>
#include <fstream>
#include <dirent.h>
#include <json.hpp>
#include "progress.h"
#include "field.h"
#include "../util.h"
#include "mood.h"
namespace cadence {
namespace generator {
generator::generator(
std::string inputpath,
std::string outputpath) :
inputpath_(inputpath),
db_(outputpath)
{
// Add directory separator to input path
if ((inputpath_.back() != '/') && (inputpath_.back() != '\\'))
{
inputpath_ += '/';
}
inputpath_ += "highlevel/";
}
void generator::run()
{
// Creates the datafile.
writeSchema();
// Scans the AcousticBrainz data dump and generates a list of all of the
// files in the dump.
scanDirectories();
// Parses each data file and enters it into the database.
parseData();
}
void generator::writeSchema()
{
std::ifstream file("schema.sql");
if (!file)
{
throw std::invalid_argument("Could not find database schema");
}
std::ostringstream schemaBuilder;
std::string line;
while (std::getline(file, line))
{
if (line.back() == '\r')
{
line.pop_back();
}
schemaBuilder << line;
}
std::string schema = schemaBuilder.str();
auto queries = split<std::list<std::string>>(schema, ";");
progress ppgs("Writing database schema...", queries.size());
for (std::string query : queries)
{
if (!queries.empty())
{
db_.runQuery(query);
}
ppgs.update();
}
}
void generator::scanDirectories()
{
std::cout << "Scanning AcousticBrainz dump..." << std::endl;
DIR* topdir;
if ((topdir = opendir(inputpath_.c_str())) == nullptr)
{
throw std::invalid_argument("Invalid AcousticBrainz data directory");
}
struct dirent* topent;
while ((topent = readdir(topdir)) != nullptr)
{
if (topent->d_name[0] != '.')
{
std::string directory = inputpath_ + topent->d_name + "/";
DIR* subdir;
if ((subdir = opendir(directory.c_str())) == nullptr)
{
throw std::invalid_argument("Invalid AcousticBrainz data directory");
}
struct dirent* subent;
while ((subent = readdir(subdir)) != nullptr)
{
if (subent->d_name[0] != '.')
{
std::string subdirectory = directory + subent->d_name + "/";
DIR* subsubdir;
if ((subsubdir = opendir(subdirectory.c_str())) == nullptr)
{
throw std::invalid_argument("Invalid AcousticBrainz data directory");
}
struct dirent* subsubent;
while ((subsubent = readdir(subsubdir)) != nullptr)
{
if (subsubent->d_name[0] != '.')
{
std::string datafile = subdirectory + subsubent->d_name;
datafiles_.push_back(datafile);
}
}
closedir(subsubdir);
}
}
closedir(subdir);
}
}
closedir(topdir);
}
void generator::parseData()
{
progress ppgs("Parsing AcousticBrainz data files...", datafiles_.size());
for (std::string datafile : datafiles_)
{
ppgs.update();
nlohmann::json jsonData;
{
std::ifstream dataStream(datafile);
dataStream >> jsonData;
}
try
{
std::vector<mood> moods;
moods.emplace_back(mood::type::danceable, jsonData["highlevel"]["danceability"]["all"]["danceable"]);
moods.emplace_back(mood::type::acoustic, jsonData["highlevel"]["mood_acoustic"]["all"]["acoustic"]);
moods.emplace_back(mood::type::aggressive, jsonData["highlevel"]["mood_aggressive"]["all"]["aggressive"]);
moods.emplace_back(mood::type::electronic, jsonData["highlevel"]["mood_electronic"]["all"]["electronic"]);
moods.emplace_back(mood::type::happy, jsonData["highlevel"]["mood_happy"]["all"]["happy"]);
moods.emplace_back(mood::type::party, jsonData["highlevel"]["mood_party"]["all"]["party"]);
moods.emplace_back(mood::type::relaxed, jsonData["highlevel"]["mood_relaxed"]["all"]["relaxed"]);
moods.emplace_back(mood::type::sad, jsonData["highlevel"]["mood_sad"]["all"]["sad"]);
moods.emplace_back(mood::type::instrumental, jsonData["highlevel"]["voice_instrumental"]["all"]["instrumental"]);
std::sort(std::begin(moods), std::end(moods), [] (const mood& left, const mood& right) -> bool {
return left.getProbability() > right.getProbability();
});
std::list<field> fields;
fields.emplace_back("title", jsonData["metadata"]["tags"]["title"][0].get<std::string>());
fields.emplace_back("artist", jsonData["metadata"]["tags"]["artist"][0].get<std::string>());
fields.emplace_back("category", moods.front().getCategory());
db_.insertIntoTable("songs", std::move(fields));
} catch (const std::domain_error& ex)
{
// Weird data. Ignore silently.
}
}
}
};
};
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