package threadsapi

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"
)

type ReplyItem struct {
	ID        string `json:"id"`
	Text      string `json:"text"`
	Username  string `json:"username"`
	Permalink string `json:"permalink"`
	Timestamp string `json:"timestamp"`
	LikeCount int    `json:"like_count"`
	ParentID  string `json:"parent_id"`
}

func (c *Client) MediaReplies(ctx context.Context, mediaID string, limit int) ([]ReplyItem, error) {
	if !c.Enabled() {
		return nil, fmt.Errorf("threads api access token is required")
	}
	mediaID = strings.TrimSpace(mediaID)
	if mediaID == "" {
		return nil, fmt.Errorf("threads media id is required")
	}
	if limit <= 0 {
		limit = 10
	}
	if limit > 50 {
		limit = 50
	}

	params := url.Values{}
	params.Set("access_token", c.accessToken)
	params.Set("fields", "id,text,username,permalink,timestamp,like_count,parent_id")
	params.Set("limit", fmt.Sprintf("%d", limit))

	endpoint := graphBaseURL + "/" + url.PathEscape(mediaID) + "/replies?" + params.Encode()
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
	if err != nil {
		return nil, err
	}
	res, err := c.http.Do(req)
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()

	body, err := io.ReadAll(io.LimitReader(res.Body, 1<<20))
	if err != nil {
		return nil, err
	}
	if res.StatusCode != http.StatusOK {
		return nil, parseAPIError(body, res.StatusCode)
	}

	var payload struct {
		Data []ReplyItem `json:"data"`
	}
	if err := json.Unmarshal(body, &payload); err != nil {
		return nil, fmt.Errorf("parse threads replies: %w", err)
	}
	return payload.Data, nil
}