using System;
using System.Threading.Tasks;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Support.UI;
using System.Text.RegularExpressions;
using WebDriverManager;
using WebDriverManager.DriverConfigs.Impl;
using System.IO;

namespace BokBonCheck
{
    public class KwangjuCityLibrarySearcher_choisangjun : KwangjuCityLibrarySearcher
    {
        public KwangjuCityLibrarySearcher_choisangjun()
        {
            SelectorValue = "MF";
            SiteName = "광주시교육청통합도서관(분관최상준도서관)";
        }
    }
    public class KwangjuCityLibrarySearcher_dagachi : KwangjuCityLibrarySearcher
    {
        public KwangjuCityLibrarySearcher_dagachi()
        {
            SelectorValue = "ME";
            SiteName = "광주시교육청통합도서관(송정다가치문화도서관)";
        }
    }
    public class KwangjuCityLibrarySearcher_central : KwangjuCityLibrarySearcher
    {
        public KwangjuCityLibrarySearcher_central()
        {
            SelectorValue = "MD";
            SiteName = "광주시교육청통합도서관(중앙도서관)";
        }
    }
    public class KwangjuCityLibrarySearcher_Student : KwangjuCityLibrarySearcher
    {
        public KwangjuCityLibrarySearcher_Student()
        {
            SelectorValue = "MC";
            SiteName = "광주시교육청통합도서관(학생교육문화회관)";
        }
    }
    public class KwangjuCityLibrarySearcher_Kumho : KwangjuCityLibrarySearcher
    {
        public KwangjuCityLibrarySearcher_Kumho()
        {
            SelectorValue = "MB";
            SiteName = "광주시교육청통합도서관(금호평생교육관)";
        }
    }
    public class KwangjuCityLibrarySearcher_Indi : KwangjuCityLibrarySearcher
    {
        public KwangjuCityLibrarySearcher_Indi()
        {
            SelectorValue = "MA";
            SiteName = "광주시교육청통합도서관(학생독립운동기념회관)";
        }
    }
    public abstract class KwangjuCityLibrarySearcher : ILibrarySearcher
    {
        public string SiteName { get; protected set; } = "광주시교육청통합도서관";
        public string SiteUrl => "https://lib.gen.go.kr/main/site/search/bookSearch.do#simple";

        protected string SelectorValue = "";


        virtual protected void SelectLibrary(WebDriverWait wait)
        {
            try
            {
                // 콤보박스(select) 요소 찾기
                var selectElement = wait.Until(d => d.FindElement(By.CssSelector("#manage_code")));
                var select = new OpenQA.Selenium.Support.UI.SelectElement(selectElement);

                // value가 "MA"인 옵션 선택
                select.SelectByValue(SelectorValue);
            }
            catch
            {
                // 예외 처리 (필요시 로깅 등)
            }
        }

        public async Task<BookSearchResult> SearchAsync(string searchTerm)
        {
            var result = new BookSearchResult
            {
                SiteName = SiteName,
                SearchTerm = searchTerm,
                SearchTime = DateTime.Now
            };

            IWebDriver driver = null;
            ChromeDriverService service = null;

            try
            {
                // ChromeDriverManager에서 설정한 드라이버 경로 사용
                var driverPath = ChromeDriverManager.GetDriverPath();
                if (string.IsNullOrEmpty(driverPath) || !File.Exists(driverPath))
                {
                    // 드라이버가 없으면 다시 설정
                    driverPath = await ChromeDriverManager.SetupChromeDriverAsync();
                }

                // ChromeDriver 서비스 설정
                service = ChromeDriverService.CreateDefaultService(Path.GetDirectoryName(driverPath), Path.GetFileName(driverPath));
                service.HideCommandPromptWindow = true;

                var options = new ChromeOptions();
                options.AddArgument("--headless");
                options.AddArgument("--no-sandbox");
                options.AddArgument("--disable-dev-shm-usage");
                options.AddArgument("--disable-gpu");
                options.AddArgument("--window-size=1920,1080");
                options.AddArgument("--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36");
                options.AddArgument("--disable-blink-features=AutomationControlled");
                options.AddExcludedArgument("enable-automation");
                options.AddAdditionalOption("useAutomationExtension", false);

                // 명시적으로 서비스와 옵션을 사용하여 드라이버 생성
                driver = new ChromeDriver(service, options);

                // 자동화 감지 방지
                ((IJavaScriptExecutor)driver).ExecuteScript("Object.defineProperty(navigator, 'webdriver', {get: () => undefined})");

                driver.Navigate().GoToUrl(SiteUrl);

                // 페이지 로딩 대기
                var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(15));

                //대상도서관 선택
                SelectLibrary(wait);

                // 검색창 찾기
                IWebElement searchBox = null;
                try
                {
                    // 여러 가능한 선택자 시도
                    var selectors = new[]
                    {
                        "input[id='search_txt']",
                        "input[type='text']",
                    };

                    foreach (var selector in selectors)
                    {
                        try
                        {
                            searchBox = wait.Until(d =>
                            {
                                var el = d.FindElement(By.CssSelector(selector));
                                return (el != null && el.Displayed && el.Enabled) ? el : null;
                            });
                            break;
                        }
                        catch
                        {
                            continue;
                        }
                    }

                    if (searchBox == null)
                    {
                        throw new Exception("검색창을 찾을 수 없습니다.");
                    }
                }
                catch (Exception ex)
                {
                    throw new Exception($"검색창 찾기 실패: {ex.Message}");
                }

                // 혹시 readonly라면 속성 제거
                ((IJavaScriptExecutor)driver).ExecuteScript("arguments[0].removeAttribute('readonly')", searchBox);

                // 입력 전 clear
                searchBox.Clear();
                searchBox.SendKeys(searchTerm);

                // 검색 버튼 클릭
                IWebElement searchButton = null;
                try
                {
                    var buttonSelectors = new[]
                    {
                        "input[type='submit']",
                    };
                    //#frm_sch > fieldset > div > div.search_style > div > input
                    foreach (var selector in buttonSelectors)
                    {
                        try
                        {
                            searchButton = driver.FindElement(By.CssSelector(selector));
                            break;
                        }
                        catch
                        {
                            continue;
                        }
                    }

                    if (searchButton == null)
                    {
                        // Enter 키로 검색 시도
                        searchBox.SendKeys(Keys.Enter);
                    }
                    else
                    {
                        searchButton.Click();
                    }
                }
                catch (Exception ex)
                {
                    // Enter 키로 검색 시도
                    searchBox.SendKeys(Keys.Enter);
                }

                // 검색 결과 로딩 대기
                await Task.Delay(3000);

                // 검색 결과 수 추출
                var resultCount = ExtractBookCount(driver);

                result.BookCount = resultCount;
                result.IsSuccess = true;
            }
            catch (Exception ex)
            {
                result.IsSuccess = false;
                result.ErrorMessage = ex.Message;
                result.BookCount = 0;
            }
            finally
            {
                driver?.Quit();
                driver?.Dispose();
                service?.Dispose();
            }

            return result;
        }

        private int ExtractBookCount(IWebDriver driver)
        {
            try
            {
                // div.search-result 내부의 span에서 '전체 N' 텍스트 추출
                var resultDiv = driver.FindElement(By.CssSelector("div.ndls_result"));
                var span = resultDiv.FindElement(By.XPath(".//span[contains(text(),'전체')]"));
                string text = span.Text; // 예: "전체 5 "
                var match = System.Text.RegularExpressions.Regex.Match(text, @"전체\s*(\d+)");
                if (match.Success)
                {
                    return int.Parse(match.Groups[1].Value);
                }
                return 0;
            }
            catch
            {
                return 0;
            }
        }
    }

}