var mysql = require('mysql');
var client = mysql.createConnection({
    host: '127.0.0.1' || '172.24.13.5',
    user: 'lcq' || 'root',
    password: 'fendoubuxi596320' || 'root123',
    database: 'mybookmarks',
    multipleStatements: true,
    port: 3306
});

client.connect();

// select 最多返回一行的话，返回对象，否则返回数组
// insert 返回关键字
// update delete 返回影响的行数
var db = {

    }
    // var sql = "SELECT * FROM `users` WHERE `username` = 'luchenqun'";
    // client.query(sql, (err, result) => {
    //     if (err) {
    //         console.log(err);
    //     } else {
    //         console.log(result);
    //     }
    // });

db.addBookmark = function(user_id, bookmark) {
    var sql = "INSERT INTO `bookmarks` (`user_id`, `title`, `description`, `url`, `public`, `click_count`) VALUES ('" + user_id + "', '" + bookmark.title + "', '" + bookmark.description + "', '" + bookmark.url + "', '" + bookmark.public + "', '1')";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.insertId);
            }
        });
    });
};

db.delBookmark = function(id){
    var sql = "DELETE FROM `bookmarks` WHERE (`id`='"+ id +"')";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
}

db.updateBookmark = function(bookmark){
    var sql = "UPDATE `bookmarks` SET `title`='"+ bookmark.title +"', `description`='"+ bookmark.description+"', `url`='"+ bookmark.url +"', `public`='"+ bookmark.public +"' WHERE (`id`='"+ bookmark.id +"')";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
}

db.getBookmark = function(id){
    var sql ="SELECT * FROM `bookmarks` WHERE `id` = '"+ id +"'";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result[0]);
            }
        });
    });
}

db.getBookmarkTags = function(bookmard_id){
    var sql ="SELECT tag_id FROM `tags_bookmarks` WHERE `bookmark_id` = '"+ bookmard_id +"'";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                var tags = result.map((item) => item.tag_id);
                resolve(tags);
            }
        });
    });
}

db.delBookmarkTags = function(bookmard_id) {
    var sql = "DELETE FROM `tags_bookmarks` WHERE (`bookmark_id`='"+ bookmard_id +"')";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
}

db.addTagsBookmarks = function(tags, bookmard_id) {
    sql = "INSERT INTO `tags_bookmarks` (`tag_id`, `bookmark_id`) VALUES";
    for (var i = 0; i < tags.length; i++) {
        if (i >= 1) {
            sql += ','
        }
        sql += "('" + tags[i] + "', '" + bookmard_id + "')";
    }
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
}

db.updateLastUseTags = function(user_id, tags) {
    sql = "UPDATE tags SET last_use = NOW() WHERE user_id = '" + user_id + "' AND id in (" + tags.toString() + ")";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
}

db.clickBookmark = function(id) {
    var sql = "UPDATE `bookmarks` SET `click_count`=`click_count`+1, `last_click`=now() WHERE (`id`='" + id + "')";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
};

db.updateUserLastLogin = function(id) {
    console.log('updateUserLastLogin');
    var sql = "UPDATE `users` SET `last_login`=now() WHERE (`id`='" + id + "')";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
};

db.getUser = function(username) {
    console.log('getUser');
    var sql = "SELECT * FROM `users` WHERE `username` = '" + username + "'";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result[0]);
            }
        });
    });
};

db.getTags = function(user_id) {
    console.log('getTags');
    var sql = "SELECT * FROM `tags` WHERE `user_id` = '" + user_id + "' ORDER BY last_use DESC";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result);
            }
        });
    });
};

db.getTagsByNames = function(user_id, tags_name) {
    console.log('getTagsByNames');
    var sql = "SELECT * FROM `tags` WHERE `user_id` = '" + user_id + "' AND `name` in (" + tags_name.toString() + ")";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result);
            }
        });
    });
};

db.addTags = function(user_id, tags_name) {
    console.log('addTags', tags_name);
    var sql = "INSERT INTO `tags` (`user_id`, `name`) VALUES";
    tags_name.forEach((name, i) => {
        if (i >= 1) {
            sql += ','
        }
        sql += "('" + user_id + "', '" + name + "')";
    });
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result.affectedRows);
            }
        });
    });
};

db.getBookmarksNavigate = function(user_id) {
    console.log('getBookmarksNavigate');
    var sql = "SELECT t.id as tag_id, t.name as tag_name, b.* FROM `tags` as t LEFT OUTER JOIN tags_bookmarks as tb ON t.id = tb.tag_id LEFT OUTER JOIN bookmarks as b ON tb.bookmark_id = b.id WHERE t.user_id='" + user_id + "' ORDER BY t.id ASC, b.click_count DESC";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result);
            }
        });
    });
};

db.getBookmarksTable = function(user_id) {
    var sql = "SELECT id, user_id, title, description, url, public, click_count, DATE_FORMAT(created_at, '%Y-%m-%d') as created_at,  DATE_FORMAT(last_click, '%Y-%m-%d') as last_click FROM `bookmarks` WHERE user_id='" + user_id + "' ORDER BY click_count DESC, created_at DESC LIMIT 0, 50";
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result);
            }
        });
    });

}

db.getBookmarksCard = function(user_id) {
    return db.getBookmarksTable(user_id);
}

db.getTagsBookmarks = function(bookmark_ids) {
    console.log('getTagsBookmarks');
    var sql = "SELECT * FROM `tags_bookmarks` WHERE bookmark_id in(" + bookmark_ids.toString() + ")"
    return new Promise(function(resolve, reject) {
        client.query(sql, (err, result) => {
            if (err) {
                reject(err);
            } else {
                resolve(result);
            }
        });
    });
}

module.exports = db;