package contributions

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"text/template"
)

var ghc = http.Client{}
var gh_token = os.Getenv("GH_TOKEN")

type SearchResponse struct {
	Items []PRResp
}

type PRResp struct {
	Body          string
	Title         string
	HtmlUrl       string `json:"html_url"`
	ClosedAt      string `json:"closed_at"`
	RepositoryUrl string `json:"repository_url"`
}

type PullRequest struct {
	Body     string
	Title    string
	ClosedAt string
	URL      string
}

var prtmpl = template.Must(template.New("pr").Parse(`- Title: {{.Title}}
  Body: {{.Body}}
`))

// String returns a formatted string representation of the PullRequest
func (pr PullRequest) String() string {
	var buf bytes.Buffer
	err := prtmpl.Execute(&buf, pr)
	if err != nil {
		return "" // Return empty string on error
	}

	return buf.String()
}

type PRMap map[string][]PullRequest

var prlisttmpl = template.Must(template.New("prlist").Parse(`{{range $k, $v := .}}
  {{$k}}:
    {{$v}}
{{end}}`))

func (p PRMap) String() string {
	var buf bytes.Buffer
	err := prlisttmpl.Execute(&buf, p)
	if err != nil {
		return "" // Return empty string on error
	}

	return buf.String()
}

func GetPRs(org, username string, from string, to string) (PRMap, error) {
	req, err := http.NewRequest(
		http.MethodGet,
		fmt.Sprintf(
			"https://api.github.com/search/issues?q=type:pr+org:%s+author:%s+is:closed+merged:%s..%s",
			org,
			username,
			from,
			to,
		),
		nil)
	if err != nil {
		return nil, fmt.Errorf("error making request: %w", err)
	}

	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", gh_token))
	resp, err := ghc.Do(req)
	if err != nil {
		return nil, fmt.Errorf("error talking to github: %w", err)
	}

	if resp.StatusCode > 400 {
		b := bytes.NewBuffer(nil)
		io.Copy(b, resp.Body)
		return nil, fmt.Errorf("error talking to github: %s", b.String())
	}
	r := &SearchResponse{}
	dec := json.NewDecoder(resp.Body)
	err = dec.Decode(&r)
	if err != nil {
		return nil, fmt.Errorf("error decoding response: %w", err)
	}

	allthings := PRMap{}

	for _, pr := range r.Items {
		reponameparts := strings.Split(pr.RepositoryUrl, "/")
		reponame := reponameparts[len(reponameparts)-1]
		if prs, ok := allthings[reponame]; !ok {
			allthings[reponame] = []PullRequest{{pr.Body, pr.Title, pr.ClosedAt, pr.HtmlUrl}}
		} else {
			allthings[reponame] = append(prs, PullRequest{pr.Body, pr.Title, pr.ClosedAt, pr.HtmlUrl})
		}
	}
	return allthings, nil
}