// Package point_tools implements simple Point Tools API wrapper for sending some service requests.
package point_tools

import (
	"bitbucket.org/skobkin/dumb-http-go"
	"bitbucket.org/skobkin/point-api-go"
	"encoding/json"
	"errors"
	"log"
	"net/http"
	"net/url"
)

const (
	STATUS_SUCCESS string = "success"
	STATUS_FAILURE string = "fail"
)

// Package errors
var (
	ErrHttpRequest         = errors.New("point-api: HTTP request error")
	ErrJsonDeserialization = errors.New("point-api: JSON deserialization error")
	ErrJsonSerialization   = errors.New("point-api: JSON serialization error")
)

type PointToolsClient struct {
	client simple_http.Client
	apiUrl string
	token  string
}

// New creates new Point Tools API client instance and initialize it to use provided URL and token
func New(apiUrl, token string) PointToolsClient {
	return PointToolsClient{
		simple_http.Client{http.Client{}},
		apiUrl,
		token,
	}
}

func GetPageJSON(page point.Page) (string, error) {
	b, err := json.Marshal(page)

	if err != nil {
		log.Println("point.Page serialize error:", err)
		return "", ErrJsonSerialization
	}

	return string(b[:]), nil
}

func GetPostWithCommentsJSON(post point.PostShowResponse) (string, error) {
	b, err := json.Marshal(post)

	if err != nil {
		log.Println("point.Page serialize error:", err)
		return "", ErrJsonSerialization
	}

	return string(b[:]), nil
}

// SendAllPage sends /all page to Point Tools crawler API gate for processing
func (c *PointToolsClient) SendAllPage(page point.Page) (SendAllPageResponse, error) {
	var response SendAllPageResponse

	jsonStr, err := GetPageJSON(page)

	if err != nil {
		return response, err
	}

	data := url.Values{}
	data.Set("token", c.token)
	data.Add("json", jsonStr)

	body, reqErr := c.client.MakePostRequest(c.apiUrl+"all/page", data, nil)

	if reqErr != nil {
		return response, ErrHttpRequest
	}

	jsonErr := json.Unmarshal(body, &response)

	if jsonErr != nil {
		return response, ErrJsonDeserialization
	}

	return response, nil
}

// SendPostWithComments sends post with comments to Point Tools crawler API gate for processing
func (c *PointToolsClient) SendPostWithComments(post point.PostShowResponse) (SendPostWithCommentsResponse, error) {
	var response SendPostWithCommentsResponse

	jsonStr, err := GetPostWithCommentsJSON(post)

	if err != nil {
		return response, err
	}

	data := url.Values{}
	data.Set("token", c.token)
	data.Add("json", jsonStr)

	body, reqErr := c.client.MakePostRequest(c.apiUrl+"all/page", data, nil)

	if reqErr != nil {
		return response, ErrHttpRequest
	}

	jsonErr := json.Unmarshal(body, &response)

	if jsonErr != nil {
		return response, ErrJsonDeserialization
	}

	return response, nil
}