package main

import (
	"bytes"
	"errors"
	"fmt"
	"os"
	"strings"

	"github.com/antchfx/htmlquery"
	"github.com/playwright-community/playwright-go"
	"golang.org/x/net/html"
)

// recurseNodes - walk HtmlNodes of a Html document
func recurseNodes(top *html.Node, sb *strings.Builder) {
	if top.Type == html.ElementNode && top.Data == "span" {
		sb.WriteString(htmlquery.InnerText(top) + "\n")
	}
	for c := top.FirstChild; c != nil; c = c.NextSibling {
		recurseNodes(c, sb)
	}
}

// searchGenius - print to file scraped song from google search
func searchGoogle(song string) (err error) {
	runOption := &playwright.RunOptions{
		SkipInstallBrowsers: true,
	}
	tempErr := playwright.Install(runOption)
	if tempErr != nil {
		err = fmt.Errorf("could not install playwright dependencies: %v", tempErr)
		return err
	}
	pw, tempErr := playwright.Run()
	if tempErr != nil {
		err = fmt.Errorf("could not start playwright: %v", tempErr)
		return err
	}
	defer func(pw *playwright.Playwright) {
		tempErr := pw.Stop()
		if tempErr != nil {
			e := fmt.Errorf("could not stop Playwright: %v", tempErr)
			err = errors.Join(err, e)
		}
	}(pw)

	option := playwright.BrowserTypeLaunchOptions{
		Channel:  playwright.String("chrome"),
		Headless: playwright.Bool(false),
	}
	browser, tempErr := pw.Chromium.Launch(option)
	if tempErr != nil {
		err = fmt.Errorf("could not launch browser: %v", tempErr)
		return err
	}

	defer func(browser playwright.Browser) {
		tempErr = browser.Close()
		if tempErr != nil {
			e := fmt.Errorf("could not close browser: %v", tempErr)
			err = errors.Join(err, e)
		}
	}(browser)
	page, tempErr := browser.NewPage()
	if tempErr != nil {
		err = fmt.Errorf("could not create page: %v", tempErr)
		return err
	}
	if _, tempErr := page.Goto(fmt.Sprintf("https://www.google.com/search?q=%ss+lyrics", song),
		playwright.PageGotoOptions{
			WaitUntil: playwright.WaitUntilStateLoad,
		}); tempErr != nil {
		err = fmt.Errorf("could not goto: %v", tempErr)
		return err
	}
	tempErr = page.Locator("body").WaitFor(playwright.LocatorWaitForOptions{
		State: playwright.WaitForSelectorStateVisible,
	})
	if tempErr != nil {
		err = fmt.Errorf("could not wait for body: %v", tempErr)
		return err
	}
	html, tempErr := page.Locator("html").InnerHTML()
	if tempErr != nil {
		err = fmt.Errorf("could not get innerHtml: %v", tempErr)
		return err
	}
	doc, tempErr := htmlquery.Parse(bytes.NewReader([]byte(html)))
	if tempErr != nil {
		err = fmt.Errorf("could not parse the innerHtml: %v", tempErr)
		return err
	}
	nodes, tempErr := htmlquery.QueryAll(doc, "//div[@data-lyricid]/div")
	if tempErr != nil {
		err = fmt.Errorf("could not get the nodes: %v", tempErr)
		return err
	}

	var sb strings.Builder
	for _, node := range nodes {
		recurseNodes(node, &sb)
	}
	if sb.Len() > 0 {
		if printDebug {
			mainLog.Println("Writing lyrics from Google...")
		}
		filename := fmt.Sprintf("%s_google.txt", outputFile)
		tempErr = os.WriteFile(filename, []byte(sb.String()), os.ModePerm)
		if tempErr != nil {
			err = fmt.Errorf("could not write to %s: %v", filename, err)
			return err
		}
	} else {
		mainLog.Println("Lyrics cannot be found...")
	}

	return nil
}