package helpers

import (
	"CatsOfMastodonBotGo/models"
	"context"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strings"
)

func GetPosts(ctx context.Context, tag string, instance string) (error, []models.Post) {
	var requestUrl = instance + "/api/v1/timelines/tag/" + tag + "?limit=40"
	req, err := http.NewRequestWithContext(ctx, "GET", requestUrl, nil)
	if err != nil {
		log.Fatal(err)
		return err, nil
	}

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		log.Fatal(err)
		return err, nil
	}
	if resp.StatusCode != 200 || strings.Split(strings.ToLower(resp.Header.Get("Content-Type")), ";")[0] != "application/json" {
		log.Fatal("Status code:", resp.StatusCode, " Content-Type:", resp.Header.Get("Content-Type"))
		return err, nil
	}

	var posts []models.Post = nil
	err = json.NewDecoder(resp.Body).Decode(&posts)
	if err != nil {
		log.Fatal(err)
		return err, nil
	}
	// defer: it basically means "do this later when the function returns"
	defer resp.Body.Close()
	if posts == nil {
		return fmt.Errorf("no posts found for tag %s on instance %s", tag, instance), nil
	}
	return nil, posts
}