package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"net/url"
	"strings"

	"git.nefrace.ru/nefrace/nechotron"
)

var docApiURL = "https://docs.godotengine.org/_/api/v2/search/?q=%s&project=godot&version=%s&language=en"
var docURL = "https://docs.godotengine.org/ru/stable/search.html?q=%s"

type DocResponse struct {
	Count    uint        `json:"count"`
	Next     string      `json:"next"`
	Previous string      `json:"previous"`
	Results  []DocResult `json:"results"`
}

type DocResult struct {
	Title      string        `json:"title"`
	Domain     string        `json:"domain"`
	Path       string        `json:"path"`
	Highlights DocHighlights `json:"highlights"`
}

type DocHighlights struct {
	Title []string `json:"title"`
}

func getDocs(topic string, version string) (string, error) {
	topic_escaped := nechotron.EscapeMd2(topic)
	not_found := fmt.Sprintf("Извините, по запросу *%s* ничего не найдено.", topic_escaped)
	req, err := url.ParseRequestURI(fmt.Sprintf(docApiURL, url.QueryEscape(topic), version))
	if err != nil {
		return not_found, err
	}
	result, err := http.Get(req.String())
	if err != nil {
		return not_found, err
	}
	defer result.Body.Close()
	var response DocResponse
	err = json.NewDecoder(result.Body).Decode(&response)
	if err != nil {
		return not_found, err
	}
	textResults := ""
	for i, r := range response.Results {
		if i > 9 {
			break
		}
		text := nechotron.EscapeMd2(r.Title)
		link, _ := url.JoinPath(r.Domain, r.Path)
		textResults += fmt.Sprintf("%d\\. [%s](%s)\n", i+1, text, link)
	}
	text := fmt.Sprintf("Вот что я нашла по запросу *%s* \\(для версии `%s`\\): \n\n%s", topic_escaped, version, textResults)
	return text, nil
}

func handleDocRequest(u *nechotron.Update) error {
	topic := u.Ctx.Value(nechotron.FilteredValue("docTopic")).(string)
	kb := nechotron.NewInlineKeyboard().
		Row(
			nechotron.InButtonCallback("Дай для 3.5", fmt.Sprintf("docs3:%s", topic)),
			nechotron.InButtonCallback("А на русском можно?", "rudocs")).
		Row(nechotron.InButtonURL("Поищу сам", fmt.Sprintf(docURL, url.QueryEscape(topic)))).
		Row(nechotron.InButtonCallback("Спасибо, не надо", "delete"))
	opts := nechotron.NewOptions().
		MarkdownV2().
		ReplyTo(u.MessageID()).
		ReplyMarkup(kb.Markup()).
		MessageOptions()

	text, docerr := getDocs(topic, "latest")
	if docerr != nil {
		log.Println("Can't get docs: ", docerr)
	}
	_, err := u.AnswerText(text, opts)
	return err
}

func handleDocRequest3(u *nechotron.Update) error {
	topic := strings.TrimPrefix(u.Callback(), "docs3:")
	kb := nechotron.NewInlineKeyboard().
		Row(
			nechotron.InButtonCallback("А на русском можно?", "rudocs")).
		Row(nechotron.InButtonURL("Поищу сам", fmt.Sprintf(docURL, url.QueryEscape(topic)))).
		Row(nechotron.InButtonCallback("Спасибо, не надо", "delete"))
	opts := nechotron.NewOptions().
		MarkdownV2().
		ReplyMarkup(kb.Markup()).
		MessageTextOptions()

	text, docerr := getDocs(topic, "3.5")
	if docerr != nil {
		log.Println("Can't get docs: ", docerr)
	}
	_, err := u.EditText(text, opts)
	return err
}