# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright (c) 2013 TrilioData, Inc.
# All Rights Reserved.

import copy
import os


def get_view_builder(req):
    base_url = req.application_url
    return ViewBuilder(base_url)


class ViewBuilder(object):
    def __init__(self, base_url):
        """
        :param base_url: url of the root wsgi application
        """
        self.base_url = base_url

    def build_choices(self, VERSIONS, req):
        version_objs = []
        for version in VERSIONS:
            version = VERSIONS[version]
            version_objs.append(
                {
                    "id": version["id"],
                    "status": version["status"],
                    "links": [{"rel": "self", "href": self.generate_href(req.path),},],
                    "media-types": version["media-types"],
                }
            )

        return dict(choices=version_objs)

    def build_versions(self, versions):
        version_objs = []
        for version in sorted(versions.keys()):
            version = versions[version]
            version_objs.append(
                {
                    "id": version["id"],
                    "status": version["status"],
                    "updated": version["updated"],
                    "links": self._build_links(version),
                }
            )

        return dict(versions=version_objs)

    def build_version(self, version):
        reval = copy.deepcopy(version)
        reval["links"].insert(
            0, {"rel": "self", "href": self.base_url.rstrip("/") + "/",}
        )
        return dict(version=reval)

    def _build_links(self, version_data):
        """Generate a container of links that refer to the provided version."""
        href = self.generate_href()

        links = [
            {"rel": "self", "href": href,},
        ]

        return links

    def generate_href(self, path=None):
        """Create an url that refers to a specific version_number."""
        version_number = "v1"
        if path:
            path = path.strip("/")
            return os.path.join(self.base_url, version_number, path)
        else:
            return os.path.join(self.base_url, version_number) + "/"