# -*- coding: utf-8 -*-
from __future__ import unicode_literals, absolute_import

from time import time
from uuid import uuid5, NAMESPACE_URL

from six import iteritems
from six.moves.urllib.parse import urlencode


def clean(data):
    '''Remove all keys where value is None'''
    return dict((k, v) for k, v in iteritems(data) if v is not None)


DEFAULT_VARS = {
    'string': '',
    'integer': 0,
    'number': 0,
}


class Request(object):
    '''Wraps a Swagger operation into a Postman Request'''
    def __init__(self, collection, path, params, method, operation):
        self.collection = collection
        self.path = path
        self.params = params
        self.method = method.upper()
        self.operation = operation

    @property
    def id(self):
        seed = str(' '.join((self.method, self.url)))
        return str(uuid5(self.collection.uuid, seed))

    @property
    def url(self):
        return self.collection.api.base_url.rstrip('/') + self.path

    @property
    def headers(self):
        headers = {}
        # Handle content-type
        if self.method != 'GET':
            consumes = self.collection.api.__schema__.get('consumes', [])
            consumes = self.operation.get('consumes', consumes)
            if len(consumes):
                headers['Content-Type'] = consumes[-1]

        # Add all parameters headers
        for param in self.operation.get('parameters', []):
            if param['in'] == 'header':
                headers[param['name']] = param.get('default', '')

        # Add security headers if needed (global then local)
        for security in self.collection.api.__schema__.get('security', []):
            for key, header in iteritems(self.collection.apikeys):
                if key in security:
                    headers[header] = ''
        for security in self.operation.get('security', []):
            for key, header in iteritems(self.collection.apikeys):
                if key in security:
                    headers[header] = ''

        lines = [':'.join(line) for line in iteritems(headers)]
        return '\n'.join(lines)

    @property
    def folder(self):
        if 'tags' not in self.operation or len(self.operation['tags']) == 0:
            return
        tag = self.operation['tags'][0]
        for folder in self.collection.folders:
            if folder.tag == tag:
                return folder.id

    def as_dict(self, urlvars=False):
        url, variables = self.process_url(urlvars)
        return clean({
            'id': self.id,
            'method': self.method,
            'name': self.operation['operationId'],
            'description': self.operation.get('summary'),
            'url': url,
            'headers': self.headers,
            'collectionId': self.collection.id,
            'folder': self.folder,
            'pathVariables': variables,
            'time': int(time()),
        })

    def process_url(self, urlvars=False):
        url = self.url
        path_vars = {}
        url_vars = {}
        params = dict((p['name'], p) for p in self.params)
        params.update(dict((p['name'], p) for p in self.operation.get('parameters', [])))
        if not params:
            return url, None
        for name, param in iteritems(params):
            if param['in'] == 'path':
                url = url.replace('{%s}' % name, ':%s' % name)
                path_vars[name] = DEFAULT_VARS.get(param['type'], '')
            elif param['in'] == 'query' and urlvars:
                default = DEFAULT_VARS.get(param['type'], '')
                url_vars[name] = param.get('default', default)
        if url_vars:
            url = '?'.join((url, urlencode(url_vars)))
        return url, path_vars


class Folder(object):
    def __init__(self, collection, tag):
        self.collection = collection
        self.tag = tag['name']
        self.description = tag['description']

    @property
    def id(self):
        return str(uuid5(self.collection.uuid, str(self.tag)))

    @property
    def order(self):
        return [
            r.id for r in self.collection.requests
            if r.folder == self.id
        ]

    def as_dict(self):
        return clean({
            'id': self.id,
            'name': self.tag,
            'description': self.description,
            'order': self.order,
            'collectionId': self.collection.id
        })


class PostmanCollectionV1(object):
    '''Postman Collection (V1 format) serializer'''
    def __init__(self, api, swagger=False):
        self.api = api
        self.swagger = swagger

    @property
    def uuid(self):
        return uuid5(NAMESPACE_URL, self.api.base_url)

    @property
    def id(self):
        return str(self.uuid)

    @property
    def requests(self):
        if self.swagger:
            # First request is Swagger specifications
            yield Request(self, '/swagger.json', {}, 'get', {
                'operationId': 'Swagger specifications',
                'summary': 'The API Swagger specifications as JSON',
            })
        # Then iter over API paths and methods
        for path, operations in iteritems(self.api.__schema__['paths']):
            path_params = operations.get('parameters', [])

            for method, operation in iteritems(operations):
                if method != 'parameters':
                    yield Request(self, path, path_params, method, operation)

    @property
    def folders(self):
        for tag in self.api.__schema__['tags']:
            yield Folder(self, tag)

    @property
    def apikeys(self):
        return dict(
            (name, secdef['name'])
            for name, secdef in iteritems(self.api.__schema__.get('securityDefinitions'))
            if secdef.get('in') == 'header' and secdef.get('type') == 'apiKey'
        )

    def as_dict(self, urlvars=False):
        return clean({
            'id': self.id,
            'name': ' '.join((self.api.title, self.api.version)),
            'description': self.api.description,
            'order': [r.id for r in self.requests if not r.folder],
            'requests': [r.as_dict(urlvars=urlvars) for r in self.requests],
            'folders': [f.as_dict() for f in self.folders],
            'timestamp': int(time()),
        })
