import sqlite3


def m000_create_migrations_table(db):
    db.execute(
        """
    CREATE TABLE dbversions (
        db TEXT PRIMARY KEY,
        version INT NOT NULL
    )
    """
    )


def m001_initial(db):
    """
    Initial LNbits tables.
    """
    db.execute(
        """
        CREATE TABLE IF NOT EXISTS accounts (
            id TEXT PRIMARY KEY,
            email TEXT,
            pass TEXT
        );
    """
    )
    db.execute(
        """
        CREATE TABLE IF NOT EXISTS extensions (
            user TEXT NOT NULL,
            extension TEXT NOT NULL,
            active BOOLEAN DEFAULT 0,

            UNIQUE (user, extension)
        );
    """
    )
    db.execute(
        """
        CREATE TABLE IF NOT EXISTS wallets (
            id TEXT PRIMARY KEY,
            name TEXT NOT NULL,
            user TEXT NOT NULL,
            adminkey TEXT NOT NULL,
            inkey TEXT
        );
    """
    )
    db.execute(
        """
        CREATE TABLE IF NOT EXISTS apipayments (
            payhash TEXT NOT NULL,
            amount INTEGER NOT NULL,
            fee INTEGER NOT NULL DEFAULT 0,
            wallet TEXT NOT NULL,
            pending BOOLEAN NOT NULL,
            memo TEXT,
            time TIMESTAMP NOT NULL DEFAULT (strftime('%s', 'now')),

            UNIQUE (wallet, payhash)
        );
    """
    )

    db.execute(
        """
        CREATE VIEW IF NOT EXISTS balances AS
        SELECT wallet, COALESCE(SUM(s), 0) AS balance FROM (
            SELECT wallet, SUM(amount) AS s  -- incoming
            FROM apipayments
            WHERE amount > 0 AND pending = 0  -- don't sum pending
            GROUP BY wallet
            UNION ALL
            SELECT wallet, SUM(amount + fee) AS s  -- outgoing, sum fees
            FROM apipayments
            WHERE amount < 0  -- do sum pending
            GROUP BY wallet
        )
        GROUP BY wallet;
    """
    )


def m002_add_fields_to_apipayments(db):
    """
    Adding fields to apipayments for better accounting,
    and renaming payhash to checking_id since that is what it really is.
    """
    try:
        db.execute("ALTER TABLE apipayments RENAME COLUMN payhash TO checking_id")
        db.execute("ALTER TABLE apipayments ADD COLUMN hash TEXT")
        db.execute("CREATE INDEX by_hash ON apipayments (hash)")
        db.execute("ALTER TABLE apipayments ADD COLUMN preimage TEXT")
        db.execute("ALTER TABLE apipayments ADD COLUMN bolt11 TEXT")
        db.execute("ALTER TABLE apipayments ADD COLUMN extra TEXT")

        import json

        rows = db.fetchall("SELECT * FROM apipayments")
        for row in rows:
            if not row["memo"] or not row["memo"].startswith("#"):
                continue

            for ext in ["withdraw", "events", "lnticket", "paywall", "tpos"]:
                prefix = "#" + ext + " "
                if row["memo"].startswith(prefix):
                    new = row["memo"][len(prefix) :]
                    db.execute(
                        """
                        UPDATE apipayments SET extra = ?, memo = ?
                        WHERE checking_id = ? AND memo = ?
                        """,
                        (json.dumps({"tag": ext}), new, row["checking_id"], row["memo"]),
                    )
                    break
    except sqlite3.OperationalError:
        # this is necessary now because it may be the case that this migration will
        # run twice in some environments.
        # catching errors like this won't be necessary in anymore now that we
        # keep track of db versions so no migration ever runs twice.
        pass