package useragents

import (
	"context"
	"encoding/json"
	"fmt"
	"io"

	"gitea.stevedudenhoeffer.com/steve/go-extractor"
)

type Config struct{}

var DefaultConfig = Config{}

func deferClose(cl io.Closer) {
	if cl != nil {
		_ = cl.Close()
	}
}

func GetMostCommonDesktopUserAgent(ctx context.Context, b extractor.Browser) (string, error) {
	return DefaultConfig.GetMostCommonDesktopUserAgent(ctx, b)
}

func (c Config) GetMostCommonDesktopUserAgent(ctx context.Context, b extractor.Browser) (string, error) {
	doc, err := b.Open(ctx, "https://www.useragents.me/", extractor.OpenPageOptions{})

	if err != nil {
		return "", fmt.Errorf("failed to open useragents.me: %w", err)
	}

	defer deferClose(doc)
	s := doc.Select("#most-common-desktop-useragents-json-csv > div:nth-child(1) > textarea:nth-child(4)")

	text := ""

	for _, el := range s {
		t, err := el.Content()
		if err != nil {
			return "", fmt.Errorf("failed to get text: %w", err)
		}
		text += t
	}
	data := []map[string]any{}

	fmt.Println("text", text)

	err = json.Unmarshal([]byte(text), &data)

	if err != nil {
		return "", err
	}

	highestAgent := ""
	highestPct := 0.0

	for _, agent := range data {
		pct, ok := agent["pct"].(float64)

		if !ok {
			continue
		}

		if pct > highestPct {
			highestPct = pct
			highestAgent = agent["ua"].(string)
		}
	}

	return highestAgent, nil
}