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from PySide2.QtSql import QSqlDatabase, QSqlError, QSqlQuery
from datetime import datetime


def add_book(q, title, year, authorId, genreId, rating):
    q.addBindValue(title)
    q.addBindValue(year)
    q.addBindValue(authorId)
    q.addBindValue(genreId)
    q.addBindValue(rating)
    q.exec_()


def add_genre(q, name):
    q.addBindValue(name)
    q.exec_()
    return q.lastInsertId()


def add_author(q, name, birthdate):
    q.addBindValue(name)
    q.addBindValue(birthdate)
    q.exec_()
    return q.lastInsertId()


def init_db():
    db = QSqlDatabase.addDatabase("QSQLITE")
    db.setDatabaseName(":memory:")

    if not db.open():
        return db.lastError()

    tables = db.tables()
    for table in tables:
        if table == "books" and table == "authors":
            return QSqlError()

    q = QSqlQuery()
    if not q.exec_("create table books(id integer primary key, title varchar, author integer, "
            "genre integer, year integer, rating integer)"):
        return q.lastError()
    if not q.exec_("create table authors(id integer primary key, name varchar, birthdate date)"):
        return q.lastError()
    if not q.exec_("create table genres(id integer primary key, name varchar)"):
        return q.lastError()

    if not q.prepare("insert into authors(name, birthdate) values(?, ?)"):
        return q.lastError()
    asimovId = add_author(q, "Isaac Asimov", datetime(1920, 2, 1))
    greeneId = add_author(q, "Graham Greene", datetime(1904, 10, 2))
    pratchettId = add_author(q, "Terry Pratchett", datetime(1948, 4, 28))

    if not q.prepare("insert into genres(name) values(?)"):
        return q.lastError()
    sfiction = add_genre(q, "Science Fiction")
    fiction = add_genre(q, "Fiction")
    fantasy = add_genre(q, "Fantasy")

    if not q.prepare("insert into books(title, year, author, genre, rating) "
            "values(?, ?, ?, ?, ?)"):
        return q.lastError()
    add_book(q, "Foundation", 1951, asimovId, sfiction, 3)
    add_book(q, "Foundation and Empire", 1952, asimovId, sfiction, 4)
    add_book(q, "Second Foundation", 1953, asimovId, sfiction, 3)
    add_book(q, "Foundation's Edge", 1982, asimovId, sfiction, 3)
    add_book(q, "Foundation and Earth", 1986, asimovId, sfiction, 4)
    add_book(q, "Prelude to Foundation", 1988, asimovId, sfiction, 3)
    add_book(q, "Forward the Foundation", 1993, asimovId, sfiction, 3)
    add_book(q, "The Power and the Glory", 1940, greeneId, fiction, 4)
    add_book(q, "The Third Man", 1950, greeneId, fiction, 5)
    add_book(q, "Our Man in Havana", 1958, greeneId, fiction, 4)
    add_book(q, "Guards! Guards!", 1989, pratchettId, fantasy, 3)
    add_book(q, "Night Watch", 2002, pratchettId, fantasy, 3)
    add_book(q, "Going Postal", 2004, pratchettId, fantasy, 3)

    return QSqlError()