import json
import os
import sys

import flask
from flask import jsonify
from flask import request
from flask.ext.sqlalchemy import SQLAlchemy


app = flask.Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = os.environ.get(
    "SQLALCHEMY_DATABASE_URI", "sqlite:///../tokens.db"
)
app.config["SQLALCHEMY_ECHO"] = True
app.config["DEBUG"] = True

db = SQLAlchemy(app)


class EmailToken(db.Model):
    """Model to store the indexed tokens"""

    id = db.Column(db.Integer, primary_key=True)
    subject = db.Column(db.String(1024))
    token = db.Column(db.String(1024))
    token_type = db.Column(db.String(1024))
    token_metadata = db.Column(db.String(2048))
    disabled = db.Column(db.Boolean, default=False)

    def get_token_metadata(self):
        if self.token_metadata:
            return json.loads(self.token_metadata)
        return None

    def as_dict(self):
        return {
            "id": self.id,
            "subject": self.subject,
            "token": self.token,
            "type": self.token_type,
            "metadata": self.get_token_metadata(),
            "disabled": self.disabled,
        }

    @classmethod
    def from_json(cls, data):
        metadata = data.get("metadata")
        try:
            metadata = json.dumps(metadata)
        except TypeError as err:
            print("Error dumping metadata", err, file=sys.stderr)

        return cls(
            subject=data.get("subject"),
            token=data.get("token"),
            token_type=data.get("type"),
            token_metadata=metadata,
            disabled=data.get("disabled", False),
        )

    @classmethod
    def jsonify_all(cls, token_type=None, desc=False):
        query = cls.query
        if token_type:
            print("Filtering query by token type", file=sys.stderr)
            query = query.filter_by(token_type=token_type)
        if desc:
            query = query.order_by(cls.id.desc())
        return jsonify(tokens=[token.as_dict() for token in query.all()])


@app.route("/")
def check():
    return "OK"


@app.route("/token", methods=["POST"])
def create_tokens():
    """Creates a token from posted JSON request"""
    new_token = EmailToken.from_json(request.get_json(force=True))

    existing_token = EmailToken.query.filter_by(
        token=new_token.token,
        token_type=new_token.token_type,
    ).first()

    print(
        "Received token with value {} and type {}".format(
            new_token.token, new_token.token_type
        ),
        file=sys.stderr,
    )

    print("Existing token? ", existing_token, file=sys.stderr)

    if not existing_token:
        print("No existing token, creating a new one", file=sys.stderr)
        db.session.add(new_token)
        db.session.commit()
        db.session.refresh(new_token)
        return jsonify(success=True, created=True, record=new_token.as_dict())
    else:
        print("Found an existing token", file=sys.stderr)
        return jsonify(success=True, created=False, record=existing_token.as_dict())


@app.route("/token", methods=["GET"])
def list_all_tokens():
    """Lists all tokens with an optional type filter"""
    token_type = request.args.get("filter_type")
    desc = request.args.get("desc", False)
    print("Asked to filter by ", token_type, file=sys.stderr)
    return EmailToken.jsonify_all(token_type=token_type, desc=desc)


@app.route("/token/<int:token_id>", methods=["GET"])
def get_token(token_id):
    """Gets a token by its primary key id"""
    token = EmailToken.query.get(token_id)
    return jsonify(token.as_dict())


if __name__ == "__main__":
    db.create_all()
    app.run(host="0.0.0.0", port=5000)