// Package main provides ...
// Get article' comments count
package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"
	"time"

	"github.com/deepzz0/logd"
	"github.com/eiblog/eiblog/setting"
)

var ErrDisqusConfig = errors.New("disqus config incorrect")

type result struct {
	Code     int
	Response []struct {
		Id          string
		Posts       int
		Identifiers []string
	}
}

// 定时获取所有文章评论数量
func PostsCount() error {
	if setting.Conf.Disqus.PostsCount == "" ||
		setting.Conf.Disqus.PublicKey == "" ||
		setting.Conf.Disqus.ShortName == "" {
		return ErrDisqusConfig
	}

	time.AfterFunc(time.Duration(setting.Conf.Disqus.Interval)*time.Hour, func() {
		err := PostsCount()
		if err != nil {
			logd.Error(err)
		}
	})

	baseUrl := setting.Conf.Disqus.PostsCount +
		"?api_key=" + setting.Conf.Disqus.PublicKey +
		"&forum=" + setting.Conf.Disqus.ShortName + "&"
	var count, index int
	for index < len(Ei.Articles) {
		var threads []string
		for ; index < len(Ei.Articles) && count < 50; index++ {
			artc := Ei.Articles[index]
			threads = append(threads, fmt.Sprintf("thread:ident=post-%s", artc.Slug))
			count++
		}
		count = 0
		url := baseUrl + strings.Join(threads, "&")
		resp, err := http.Get(url)
		if err != nil {
			return err
		}
		defer resp.Body.Close()

		b, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			return err
		}
		if resp.StatusCode != http.StatusOK {
			return errors.New(string(b))
		}

		rst := result{}
		err = json.Unmarshal(b, &rst)
		if err != nil {
			return err
		}
		for _, v := range rst.Response {
			i := strings.Index(v.Identifiers[0], "-")
			artc := Ei.MapArticles[v.Identifiers[0][i+1:]]
			if artc != nil {
				artc.Count = v.Posts
				artc.Thread = v.Id
			}
		}
	}

	return nil
}

type postsList struct {
	Cursor struct {
		HasNext bool
		Next    string
	}
	Code     int
	Response []struct {
		Parent    int
		Id        string
		CreatedAt string
		Message   string
		Author    struct {
			Name       string
			ProfileUrl string
			Avatar     struct {
				Cache string
			}
		}
		Thread string
	}
}

// 获取文章评论列表
func PostsList(slug, cursor string) (*postsList, error) {
	if setting.Conf.Disqus.PostsList == "" ||
		setting.Conf.Disqus.PublicKey == "" ||
		setting.Conf.Disqus.ShortName == "" {
		return nil, ErrDisqusConfig
	}
	url := setting.Conf.Disqus.PostsList + "?limit=50&api_key=" +
		setting.Conf.Disqus.PublicKey + "&forum=" + setting.Conf.Disqus.ShortName +
		"&cursor=" + cursor + "&thread:ident=post-" + slug
	resp, err := http.Get(url)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	if resp.StatusCode != http.StatusOK {
		return nil, errors.New(string(b))
	}
	pl := &postsList{}
	err = json.Unmarshal(b, pl)
	if err != nil {
		return nil, err
	}
	return pl, nil
}

type PostCreate struct {
	Message     string `json:"message"`
	Parent      string `json:"parent"`
	Thread      string `json:"thread"`
	AuthorEmail string `json:"author_email"`
	AuthorName  string `json:"autor_name"`
	IpAddress   string `json:"ip_address"`
	Identifier  string `json:"identifier"`
	UserAgent   string `json:"user_agent"`
}

type PostResponse struct {
	Code     int `json:"code"`
	Response struct {
		Id string `json:"id"`
	} `json:"response"`
}

// 评论文章
func PostComment(pc *PostCreate) (string, error) {
	if setting.Conf.Disqus.PostsList == "" ||
		setting.Conf.Disqus.PublicKey == "" ||
		setting.Conf.Disqus.ShortName == "" {
		return "", ErrDisqusConfig
	}
	url := setting.Conf.Disqus.PostCreate +
		"?api_key=E8Uh5l5fHZ6gD8U3KycjAIAk46f68Zw7C6eW8WSjZvCLXebZ7p0r1yrYDrLilk2F" +
		"&message=" + pc.Message + "&parent=" + pc.Parent +
		"&thread=" + pc.Thread + "&author_email=" + pc.AuthorEmail +
		"&author_name=" + pc.AuthorName

	request, err := http.NewRequest("POST", url, nil)
	if err != nil {
		return "", err
	}
	request.Header.Set("Referer", "https://disqus.com")
	resp, err := http.DefaultClient.Do(request)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	if resp.StatusCode != http.StatusOK {
		return "", errors.New(string(b))
	}
	pr := &PostResponse{}
	err = json.Unmarshal(b, pr)
	if err != nil {
		return "", err
	}
	return pr.Response.Id, nil
}

type ApprovedResponse struct {
	Code     int `json:"code"`
	Response []struct {
		Id string `json:"id"`
	} `json:"response"`
}

// 批准评论通过
func PostApprove(post string) error {
	if setting.Conf.Disqus.PostsList == "" ||
		setting.Conf.Disqus.PublicKey == "" ||
		setting.Conf.Disqus.ShortName == "" {
		return ErrDisqusConfig
	}

	url := setting.Conf.Disqus.PostApprove +
		"?api_key=" + setting.Conf.Disqus.PublicKey +
		"&access_token=" + setting.Conf.Disqus.AccessToken +
		"&post=" + post
	request, err := http.NewRequest("POST", url, nil)
	if err != nil {
		return err
	}
	request.Header.Set("Referer", "https://disqus.com")
	resp, err := http.DefaultClient.Do(request)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return err
	}

	if resp.StatusCode != http.StatusOK {
		return errors.New(string(b))
	}

	ar := &ApprovedResponse{}
	err = json.Unmarshal(b, ar)
	if err != nil {
		return err
	}

	return nil
}