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package main

/*
   This file is part of taler-dashboard
   Copyright (C) 2023 Özgür Kesim

   taler-dashboard is free software; you can redistribute it and/or modify it
   under the terms of the GNU Affero General Public License as published by the
   Free Software Foundation; either version 3, or (at your option) any later
   version.

   taler-dashboard is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
   License for more details.

   You can receive a copy of the GNU Affero General Public License from
   <http://www.gnu.org/licenses/>

   @author Özgür Kesim <oec-taler@kesim.org>
*/

import (
	"context"
	"encoding/json"
	"fmt"
	"html/template"
	"io"
	"log"
	"net/http"
	"strings"
	"sync"
	"time"
)

type Data struct {
	mux            sync.RWMutex
	url            string
	token          string
	num            int
	projectId      int
	filterId       int
	minimumVersion string
	tmpl           *template.Template
	ctx            context.Context

	Issues    Issues
	Timestamp time.Time
	Freq      time.Duration
	Lasterror error
}

func NewData(ctx context.Context, url, token string, num int) *Data {
	data := &Data{
		url:   url,
		token: token,
		ctx:   ctx,
		num:   num,
	}
	fm := map[string]any{
		"shorten": func(max int, s string) string {
			if len(s) <= max {
				return s
			}
			return s[:max] + "⋯"
		},
	}
	data.tmpl = template.Must(template.New("index").Funcs(fm).ParseFS(content, "*.tmpl"))

	return data
}

func (d *Data) update() {
	url := fmt.Sprintf("%s?project_id=%dfilter_id=%d&page_size=%d",
		d.url, d.projectId, d.filterId, d.num)
	req, e := http.NewRequestWithContext(d.ctx, "GET", url, nil)
	if nil != e {
		d.mux.Lock()
		defer d.mux.Unlock()
		d.Lasterror = e
		return
	}
	req.Header.Add("Authorization", d.token)

	r, e := http.DefaultClient.Do(req)
	if nil != e {
		d.mux.Lock()
		defer d.mux.Unlock()
		d.Lasterror = e
		return
	} else if 200 != r.StatusCode {
		d.mux.Lock()
		defer d.mux.Unlock()
		d.Lasterror = fmt.Errorf("Got unexpected status %s\n", r.Status)
		return
	}

	iss := struct{ Issues Issues }{}
	e = json.NewDecoder(r.Body).Decode(&iss)

	d.mux.Lock()
	defer d.mux.Unlock()
	d.Lasterror = e
	if nil != e {
		return
	}
	d.Timestamp = time.Now()

	// Filter issues with old target versions out
	var issues = Issues{}
	for _, issue := range iss.Issues {
		if issue.Resolution.Name == "open" &&
			strings.Compare(d.minimumVersion, issue.TargetVersion.Name) < 0 {
			issues = append(issues, issue)
		}
	}
	d.Issues = issues
}

func (d *Data) printJSON(w io.Writer) {
	d.mux.RLock()
	defer d.mux.RUnlock()

	if nil == d.Issues {
		fmt.Fprintln(w, "{}")
		return
	}
	enc := json.NewEncoder(w)
	enc.SetIndent("", " ")
	enc.Encode(d.Issues)
}

func (d *Data) printTemplate(w io.Writer, name string) {
	d.mux.RLock()
	defer d.mux.RUnlock()
	e := d.tmpl.ExecuteTemplate(w, name, d)
	if nil != e {
		log.Println(e)
	}
}