package components

import (
	"os"
	"net/url"
	"net/http"
	"encoding/json"
	"log"
	"slices"
	"extrovert/internals"
	"fmt"
	"errors"
)

type Instance struct {
	Name string `json:"name"`
}

func fetchInstanceList(limit int) ([]Instance, error) {

	u, err := url.ParseRequestURI("https://instances.social/api/1.0/instances/list")
	if err != nil {
		return []Instance{}, err
	}

	u.Query().Add("min_version", "0.1.0")
	u.Query().Add("sort_by", "active_users")
	u.Query().Add("count", fmt.Sprintf("%v", limit))
	u.Query().Add("prohibted_content", "nudity_nocw")
	u.Query().Add("prohibted_content", "pornography_nocw")
	u.Query().Add("prohibted_content", "illegalContentLinks")
	u.Query().Add("prohibted_content", "spam")
	u.Query().Add("prohibted_content", "advertising")

	req, err := http.NewRequest(http.MethodGet, u.String(), bytes.NewReader([]byte("")))
	if err != nil {
		return []Instance{}, err
	}
	req.Header.Add("Authorization", "Bearer "+os.Getenv("INSTANCES_SOCIAL_TOKEN"))

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return []Instance{}, err
	}

	body, err := io.ReadAll(res.Body)
	if err != nil {
		return []Instance{}, err
	} else if res.StatusCode != 200 {
		return []Instance{}, errors.New(string(body))
	}

	var list struct {
		Instances []Instance `json:"instances"`
	}
	err = json.Unmarshal(body, &list)

	return list.Instances, err
}

var INSTANCES = []Instance{
	/*
		These servers are not endorsed, curated or affiliated by Capytal in any way, shape
		or form. All the instances where got from the top 15 listed in https://joinmastodon.org/servers,
		at July 8th, 2024 (2024-07-08).
	*/
	{Name: "mastodon.social"},
	{Name: "mstdn.social"},
	{Name: "mas.to"},
	{Name: "social.vivaldi.net"},
	{Name: "mastodonapp.uk"},
	{Name: "universeodon.com"},
	{Name: "c.im"},
	{Name: "mstdn.party"},
	{Name: "toot.community"},
	{Name: "ohai.social"},
	{Name: "mstdn.business"},
	{Name: "ieji.de"},
	{Name: "toot.io"},
	{Name: "masto.nu"},
	{Name: "mstdn.plus"},
}

func getInstanceList(limit int) []Instance {
	i, err := fetchInstanceList(limit)
	if err != nil {
		log.Printf("WARN: Unable to fetch Mastodon instance datalist due to:\n%s\n\nFall backing into static list.", err.Error())
		return INSTANCES
	}
	return internals.RemoveDuplicates(slices.Concat(INSTANCES, i))
}

templ InstancesOptions(limit int) {
	for _, v := range getInstanceList(limit) {
		<option value={ "https://" + v.Name } label={ v.Name }></option>
	}
}