request = require './q-request'
_ = require 'underscore'
Q = require 'q'

class CouchDB
    constructor: (url) ->
        @url = normalizeURL url
    get: (id) ->
        url = "#{@url}/#{id}"
        couchRequest 'GET', url
    post: (doc) ->
        url = "#{@url}"
        couchRequest 'POST', url, doc
    put: (id, doc) ->
        url = "#{@url}/#{id}"
        couchRequest 'PUT', url, doc

normalizeURL = (url) ->
    url.replace /\/$/, ''

couchRequest = (method, url, data) ->
    options =
        method: method,
        headers:
            'content-type': 'application/json; charset=utf-8'
            'accept': 'application/json'
        body: JSON.stringify (stringifyFunctions (data || {}))
    request(url, options)
    .then (res) =>
        JSON.parse res
    , (err) =>
        Q.reject (JSON.parse err)

stringifyFunctions = (value) ->
    if value is null
        null
    else if _.isArray value
        value
    else if _.isFunction value
        value.toString()
    else if _.isObject value
        value = _.clone value
        _.each value, (propValue, propName) =>
            value[propName] = stringifyFunctions propValue
        value
    else
        value

exports.CouchDB = CouchDB