# stdlib
import argparse
import sys
import platform
import webbrowser

# 3p
from datadog.util.format import pretty_json

# datadog
from datadog import api
from datadog.dogshell.common import report_errors, report_warnings, print_err
from datadog.util.compat import json
from datetime import datetime


class ScreenboardClient(object):

    @classmethod
    def setup_parser(cls, subparsers):
        parser = subparsers.add_parser('screenboard', help="Create, edit, and delete screenboards.")
        parser.add_argument('--string_ids', action='store_true', dest='string_ids',
                            help="Represent screenboard IDs as strings instead of ints in JSON")

        verb_parsers = parser.add_subparsers(title='Verbs', dest='verb')
        verb_parsers.required = True

        post_parser = verb_parsers.add_parser('post', help="Create screenboards.")
        post_parser.add_argument('title', help="title for the new screenboard")
        post_parser.add_argument('description', help="short description of the screenboard")
        post_parser.add_argument('graphs', help="graph definitions as a JSON string."
                                 " if unset, reads from stdin.", nargs="?")
        post_parser.add_argument('--template_variables', type=_template_variables, default=[],
                                 help="a json list of template variable dicts, e.g. "
                                 "[{'name': 'host', 'prefix': 'host', 'default': 'host:my-host'}]")
        post_parser.add_argument('--width', type=int, default=None,
                                 help="screenboard width in pixels")
        post_parser.add_argument('--height', type=int, default=None,
                                 help="screenboard height in pixels")
        post_parser.set_defaults(func=cls._post)

        update_parser = verb_parsers.add_parser('update', help="Update existing screenboards.")
        update_parser.add_argument('screenboard_id', help="screenboard to replace "
                                   " with the new definition")
        update_parser.add_argument('title', help="title for the new screenboard")
        update_parser.add_argument('description', help="short description of the screenboard")
        update_parser.add_argument('graphs', help="graph definitions as a JSON string."
                                   " if unset, reads from stdin.", nargs="?")
        update_parser.add_argument('--template_variables', type=_template_variables, default=[],
                                   help="a json list of template variable dicts, e.g. "
                                   "[{'name': 'host', 'prefix': 'host', 'default': "
                                   "'host:my-host'}]")
        update_parser.add_argument('--width', type=int, default=None,
                                   help="screenboard width in pixels")
        update_parser.add_argument('--height', type=int, default=None,
                                   help="screenboard height in pixels")
        update_parser.set_defaults(func=cls._update)

        show_parser = verb_parsers.add_parser('show', help="Show a screenboard definition.")
        show_parser.add_argument('screenboard_id', help="screenboard to show")
        show_parser.set_defaults(func=cls._show)

        delete_parser = verb_parsers.add_parser('delete', help="Delete a screenboard.")
        delete_parser.add_argument('screenboard_id', help="screenboard to delete")
        delete_parser.set_defaults(func=cls._delete)

        share_parser = verb_parsers.add_parser('share', help="Share an existing screenboard's"
                                               " with a public URL.")
        share_parser.add_argument('screenboard_id', help="screenboard to share")
        share_parser.set_defaults(func=cls._share)

        revoke_parser = verb_parsers.add_parser('revoke', help="Revoke an existing screenboard's"
                                                " with a public URL.")
        revoke_parser.add_argument('screenboard_id', help="screenboard to revoke")
        revoke_parser.set_defaults(func=cls._revoke)

        pull_parser = verb_parsers.add_parser('pull', help="Pull a screenboard on the server"
                                              " into a local file")
        pull_parser.add_argument('screenboard_id', help="ID of screenboard to pull")
        pull_parser.add_argument('filename', help="file to pull screenboard into")
        pull_parser.set_defaults(func=cls._pull)

        push_parser = verb_parsers.add_parser('push', help="Push updates to screenboards"
                                              " from local files to the server")
        push_parser.add_argument('--append_auto_text', action='store_true', dest='append_auto_text',
                                 help="When pushing to the server, appends filename and"
                                 " timestamp to the end of the screenboard description")
        push_parser.add_argument('file', help="screenboard files to push to the server",
                                 nargs='+', type=argparse.FileType('r'))
        push_parser.set_defaults(func=cls._push)

        new_file_parser = verb_parsers.add_parser('new_file', help="Create a new screenboard"
                                                  " and put its contents in a file")
        new_file_parser.add_argument('filename', help="name of file to create with"
                                     " empty screenboard")
        new_file_parser.add_argument('graphs', help="graph definitions as a JSON string."
                                     " if unset, reads from stdin.", nargs="?")
        new_file_parser.set_defaults(func=cls._new_file)

    @classmethod
    def _pull(cls, args):
        cls._write_screen_to_file(args.screenboard_id, args.filename, args.timeout,
                                  args.format, args.string_ids)

    # TODO Is there a test for this one ?
    @classmethod
    def _push(cls, args):
        api._timeout = args.timeout
        for f in args.file:
            try:
                screen_obj = json.load(f)
            except Exception as err:
                raise Exception("Could not parse {0}: {1}".format(f.name, err))

            if args.append_auto_text:
                datetime_str = datetime.now().strftime('%x %X')
                auto_text = ("<br/>\nUpdated at {0} from {1} ({2}) on {3}"
                             .format(datetime_str, f.name, screen_obj["id"], platform.node()))
                screen_obj["description"] += auto_text

            if 'id' in screen_obj:
                # Always convert to int, in case it was originally a string.
                screen_obj["id"] = int(screen_obj["id"])
                res = api.Screenboard.update(**screen_obj)
            else:
                res = api.Screenboard.create(**screen_obj)

            if 'errors' in res:
                print_err('Upload of screenboard {0} from file {1} failed.'
                          .format(screen_obj["id"], f.name))

            report_warnings(res)
            report_errors(res)

            if format == 'pretty':
                print(pretty_json(res))
            else:
                print(json.dumps(res))

            if args.format == 'pretty':
                print("Uploaded file {0} (screenboard {1})".format(f.name, screen_obj["id"]))

    @classmethod
    def _write_screen_to_file(cls, screenboard_id, filename, timeout,
                              format='raw', string_ids=False):
        with open(filename, "w") as f:
            res = api.Screenboard.get(screenboard_id)
            report_warnings(res)
            report_errors(res)

            screen_obj = res
            if "resource" in screen_obj:
                del screen_obj["resource"]
            if "url" in screen_obj:
                del screen_obj["url"]

            if string_ids:
                screen_obj["id"] = str(screen_obj["id"])

            json.dump(screen_obj, f, indent=2)

            if format == 'pretty':
                print("Downloaded screenboard {0} to file {1}".format(screenboard_id, filename))
            else:
                print("{0} {1}".format(screenboard_id, filename))

    @classmethod
    def _post(cls, args):
        graphs = sys.stdin.read()
        api._timeout = args.timeout
        format = args.format
        graphs = args.graphs
        if args.graphs is None:
            graphs = sys.stdin.read()
        try:
            graphs = json.loads(graphs)
        except:
            raise Exception('bad json parameter')
        res = api.Screenboard.create(
            title=args.title, description=args.description, graphs=[graphs],
            template_variables=args.template_variables, width=args.width, height=args.height)
        report_warnings(res)
        report_errors(res)
        if format == 'pretty':
            print(pretty_json(res))
        else:
            print(json.dumps(res))

    @classmethod
    def _update(cls, args):
        api._timeout = args.timeout
        format = args.format
        graphs = args.graphs
        if args.graphs is None:
            graphs = sys.stdin.read()
        try:
            graphs = json.loads(graphs)
        except:
            raise Exception('bad json parameter')

        res = api.Screenboard.update(
            args.screenboard_id, title=args.title, description=args.description,
            graphs=graphs, template_variables=args.template_variables,
            width=args.width, height=args.height)
        report_warnings(res)
        report_errors(res)
        if format == 'pretty':
            print(pretty_json(res))
        else:
            print(json.dumps(res))

    @classmethod
    def _web_view(cls, args):
        dash_id = json.load(args.file)['id']
        url = api._api_host + "/dash/dash/{0}".format(dash_id)
        webbrowser.open(url)

    @classmethod
    def _show(cls, args):
        api._timeout = args.timeout
        format = args.format
        res = api.Screenboard.get(args.screenboard_id)
        report_warnings(res)
        report_errors(res)

        if args.string_ids:
            res["id"] = str(res["id"])

        if format == 'pretty':
            print(pretty_json(res))
        else:
            print(json.dumps(res))

    @classmethod
    def _delete(cls, args):
        api._timeout = args.timeout
        # TODO CHECK
        res = api.Screenboard.delete(args.screenboard_id)
        if res is not None:
            report_warnings(res)
            report_errors(res)

    @classmethod
    def _share(cls, args):
        api._timeout = args.timeout
        format = args.format
        res = api.Screenboard.share(args.screenboard_id)

        if format == 'pretty':
            print(pretty_json(res))
        else:
            print(json.dumps(res))

    @classmethod
    def _revoke(cls, args):
        api._timeout = args.timeout
        format = args.format
        res = api.Screenboard.revoke(args.screenboard_id)

        if format == 'pretty':
            print(pretty_json(res))
        else:
            print(json.dumps(res))

    @classmethod
    def _new_file(cls, args):
        api._timeout = args.timeout
        format = args.format
        graphs = args.graphs
        if args.graphs is None:
            graphs = sys.stdin.read()
        try:
            graphs = json.loads(graphs)
        except:
            raise Exception('bad json parameter')
        res = api.Screenboard.create(title=args.filename,
                                     description="Description for {0}".format(args.filename),
                                     graphs=[graphs])
        report_warnings(res)
        report_errors(res)

        cls._write_screen_to_file(res['id'], args.filename, args.timeout, format, args.string_ids)

        if format == 'pretty':
            print(pretty_json(res))
        else:
            print(json.dumps(res))


def _template_variables(tpl_var_input):
    if '[' not in tpl_var_input:
        return [v.strip() for v in tpl_var_input.split(',')]
    else:
        try:
            return json.loads(tpl_var_input)
        except Exception:
            raise argparse.ArgumentTypeError('bad template_variable json parameter')