# SPDX-License-Identifier: GPL-2.0-only
#
# This file is part of Nominatim. (https://nominatim.org)
#
# Copyright (C) 2022 by the Nominatim developer community.
# For a full list of authors see the git log.
"""
Server implementation using the sanic webserver framework.
"""
from pathlib import Path

import sanic

from nominatim.api import NominatimAPIAsync
from nominatim.apicmd.status import StatusResult
import nominatim.result_formatter.v1 as formatting

api = sanic.Blueprint('NominatimAPI')

CONTENT_TYPE = {
  'text': 'text/plain; charset=utf-8',
  'xml': 'text/xml; charset=utf-8'
}

def usage_error(msg):
    return sanic.response.text(msg, status=400)


def api_response(request, result):
    body = request.ctx.formatter.format(result, request.ctx.format)
    return sanic.response.text(body,
                               content_type=CONTENT_TYPE.get(request.ctx.format, 'application/json'))


@api.on_request
async def extract_format(request):
    request.ctx.formatter = request.app.ctx.formatters[request.route.ctx.result_type]

    request.ctx.format = request.args.get('format', request.route.ctx.default_format)
    if not request.ctx.formatter.supports_format(request.ctx.format):
        return usage_error("Parameter 'format' must be one of: " +
                           ', '.join(request.ctx.formatter.list_formats()))


@api.get('/status', ctx_result_type=StatusResult, ctx_default_format='text')
async def status(request):
    return api_response(request,await request.app.ctx.api.status())


def get_application(project_dir: Path) -> sanic.Sanic:
    app = sanic.Sanic("NominatimInstance")

    app.ctx.api = NominatimAPIAsync(project_dir)
    app.ctx.formatters = {}
    for rtype in (StatusResult, ):
        app.ctx.formatters[rtype] = formatting.create(rtype)

    app.blueprint(api)

    return app