using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using FinlyticCore.Dtos.Yahoo;
using FinlyticCore.Models.Settings;
using FinlyticCore.Services;
using FinlyticCore.Services.PlaywrightScrapper;
using Microsoft.Playwright;

namespace FinlyticCore.Clients;

public interface IYahooFinanceHtmlClient
{
    Task<YahooQuoteSummaryModulesDto?> ScrapeQuoteSummaryModulesAsync(
        string isinOrSymbol,
        CancellationToken cancellationToken = default);
}

public class YahooFinanceHtmlClient : IYahooFinanceHtmlClient
{
    private const string _serviceName = nameof(YahooFinanceHtmlClient);
    private readonly IPlaywrightExecutionService _playwrightService;
    private readonly IFinlyticLogger<YahooFinanceHtmlClient> _finlyticLogger;

    public YahooFinanceHtmlClient(
        IPlaywrightExecutionService playwrightService,
        IFinlyticLogger<YahooFinanceHtmlClient> finlyticLogger)
    {
        _playwrightService = playwrightService;
        _finlyticLogger = finlyticLogger;
    }

    public async Task<YahooQuoteSummaryModulesDto?> ScrapeQuoteSummaryModulesAsync(
        string isinOrSymbol,
        CancellationToken cancellationToken = default)
    {
        if (string.IsNullOrWhiteSpace(isinOrSymbol)) return null;

        var symbol = isinOrSymbol.Trim().ToUpperInvariant();
        await _finlyticLogger.LogInfoAsync(CoreSettingKeys.HtmlScrapperChannel, $"[{_serviceName}] [YahooFinanceHtmlClient] Starting parallel Playwright HTML scrape for symbol '{symbol}'...");

        return await _playwrightService.ExecuteInContextAsync(async context =>
        {
            var keyStatsData = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
            var financialsData = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
            var analysisData = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

            ProfileExtractionResult? profileResult = null;

            var statsUrl = $"https://finance.yahoo.com/quote/{Uri.EscapeDataString(symbol)}/key-statistics/";
            var profileUrl = $"https://finance.yahoo.com/quote/{Uri.EscapeDataString(symbol)}/profile/";
            var financialsUrl = $"https://finance.yahoo.com/quote/{Uri.EscapeDataString(symbol)}/financials/";
            var analysisUrl = $"https://finance.yahoo.com/quote/{Uri.EscapeDataString(symbol)}/analysis/";

            var statsTask = ScrapePagePairsAsync(context, statsUrl, cancellationToken);
            var profileTask = ScrapeProfilePageAsync(context, profileUrl, cancellationToken);
            var financialsTask = ScrapePagePairsAsync(context, financialsUrl, cancellationToken);
            var analysisTask = ScrapePagePairsAsync(context, analysisUrl, cancellationToken);

            try
            {
                await Task.WhenAll(statsTask, profileTask, financialsTask, analysisTask);

                keyStatsData = await statsTask;
                profileResult = await profileTask;
                financialsData = await financialsTask;
                analysisData = await analysisTask;
            }
            catch (Exception ex)
            {
                await _finlyticLogger.LogWarningAsync(CoreSettingKeys.HtmlScrapperChannel, ex, $"[{_serviceName}] Non-fatal error during parallel page scraping for {symbol}.");
            }

            var profileDict = profileResult?.ProfileDict ?? new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
            var officers = profileResult?.Officers ?? new List<YahooCompanyOfficerDto>();

            await _finlyticLogger.LogInfoAsync(CoreSettingKeys.HtmlScrapperChannel, $"[{_serviceName}] Scrape complete for '{symbol}'. Officers: {officers.Count}, Stats Keys: {keyStatsData.Count}");

            return BuildModulesDto(
                keyStatsData, 
                profileDict, 
                financialsData, 
                analysisData, 
                officers, 
                profileResult?.Sector, 
                profileResult?.Industry, 
                profileResult?.Employees, 
                profileResult?.Description);

        }, PlaywrightBrowserFactory.GetDefaultContextOptions(), cancellationToken);
    }

    private async Task<Dictionary<string, string>> ScrapePagePairsAsync(
        IBrowserContext context,
        string url,
        CancellationToken cancellationToken)
    {
        var targetDict = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
        var page = await context.NewPageAsync();

        try
        {
            await page.GotoAsync(url, new PageGotoOptions
            {
                WaitUntil = WaitUntilState.DOMContentLoaded,
                Timeout = 20_000
            });

            await HandleConsentAsync(page);

            var extracted = await page.EvaluateAsync<Dictionary<string, string>>(@"() => {
                const results = {};
                
                const cleanKey = (str) => {
                    return str.toLowerCase()
                              .replace(/\(ttm\)|\(mrq\)|\(fye\)/g, '')
                              .replace(/\s*\d+\s*$/, '')
                              .replace(/\s+/g, ' ')
                              .trim();
                };

                document.querySelectorAll('table tr').forEach(tr => {
                    const cells = Array.from(tr.querySelectorAll('td, th')).map(c => c.innerText.trim());
                    if (cells.length >= 2 && cells[0] && cells[1]) {
                        const key = cleanKey(cells[0]);
                        const val = cells[1].replace(/\s+/g, ' ').trim();
                        if (key && val && val !== 'N/A' && val !== '--' && val !== '-') {
                            results[key] = val;
                        }
                    }
                });

                return results;
            }");

            if (extracted != null)
            {
                foreach (var (k, v) in extracted)
                {
                    targetDict[k] = v;
                }
            }
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogDebugAsync(CoreSettingKeys.HtmlScrapperChannel, ex, $"[{_serviceName}] Non-critical error scraping URL {url}");
        }
        finally
        {
            await page.CloseAsync();
        }

        return targetDict;
    }

    private async Task<ProfileExtractionResult> ScrapeProfilePageAsync(
        IBrowserContext context,
        string url,
        CancellationToken cancellationToken)
    {
        var profileDict = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
        var companyOfficers = new List<YahooCompanyOfficerDto>();
        string? sector = null;
        string? industry = null;
        int? fullTimeEmployees = null;
        string? description = null;

        var page = await context.NewPageAsync();

        try
        {
            await page.GotoAsync(url, new PageGotoOptions
            {
                WaitUntil = WaitUntilState.DOMContentLoaded,
                Timeout = 20_000
            });

            await HandleConsentAsync(page);

            var metaInfo = await page.EvaluateAsync<ProfileMetaJsResult>(@"() => {
                let sector = null, industry = null, employees = null, description = null;
                
                const descEl = document.querySelector('section[data-testid=""description""] p, div[data-testid=""description""] p, p.business-summary');
                if (descEl) description = descEl.innerText.trim();

                const profileSec = document.querySelector('section[data-testid=""asset-profile""], div.asset-profile-container, main');
                if (profileSec) {
                    const text = profileSec.innerText;
                    const sectorMatch = text.match(/Sector\(s\)\s*:?\s*([^\n\r]+)/i) || text.match(/Sector\s*:?\s*([^\n\r]+)/i);
                    if (sectorMatch) sector = sectorMatch[1].trim();

                    const indMatch = text.match(/Industry\s*:?\s*([^\n\r]+)/i);
                    if (indMatch) industry = indMatch[1].trim();

                    const empMatch = text.match(/Full Time Employees\s*:?\s*([\d,]+)/i);
                    if (empMatch) {
                        const cleanNum = empMatch[1].replace(/,/g, '');
                        employees = parseInt(cleanNum, 10);
                    }
                }

                const officers = [];
                const officerRows = document.querySelectorAll('section[data-testid=""asset-profile""] table tr, table.officers tr, main table tr');
                officerRows.forEach((tr, index) => {
                    if (index === 0) return;
                    const tds = Array.from(tr.querySelectorAll('td')).map(td => td.innerText.trim());
                    if (tds.length >= 2) {
                        officers.push({
                            name: tds[0] || null,
                            title: tds[1] || null,
                            pay: tds[2] || null,
                            exercised: tds[3] || null,
                            yearBorn: tds[4] ? parseInt(tds[4], 10) : null
                        });
                    }
                });

                return { sector, industry, employees, description, officers };
            }");

            if (metaInfo != null)
            {
                sector = metaInfo.Sector;
                industry = metaInfo.Industry;
                fullTimeEmployees = metaInfo.Employees;
                description = metaInfo.Description;

                if (metaInfo.Officers != null)
                {
                    foreach (var off in metaInfo.Officers)
                    {
                        if (!string.IsNullOrWhiteSpace(off.Name))
                        {
                            companyOfficers.Add(new YahooCompanyOfficerDto(
                                Name: off.Name,
                                Age: off.YearBorn.HasValue ? (DateTime.UtcNow.Year - off.YearBorn.Value) : null,
                                Title: off.Title,
                                YearBorn: off.YearBorn,
                                FiscalYear: null,
                                TotalPay: ParseYahooValue(off.Pay),
                                ExercisedValue: ParseYahooValue(off.Exercised),
                                UnexercisedValue: null
                            ));
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            await _finlyticLogger.LogDebugAsync(CoreSettingKeys.HtmlScrapperChannel, ex, $"[{_serviceName}] Non-critical error scraping Profile page {url}");
        }
        finally
        {
            await page.CloseAsync();
        }

        return new ProfileExtractionResult(profileDict, companyOfficers, sector, industry, fullTimeEmployees, description);
    }

    private static async Task HandleConsentAsync(IPage page)
    {
        try
        {
            if (page.Url.Contains("consent.yahoo.com"))
            {
                var consentBtn = page.Locator("button[name='agree'], button[value='agree'], button.accept-all, form[action*='consent'] button");
                if (await consentBtn.CountAsync() > 0)
                {
                    await consentBtn.First.ClickAsync();
                    await page.WaitForLoadStateAsync(LoadState.DOMContentLoaded, new PageWaitForLoadStateOptions { Timeout = 10_000 });
                }
            }
        }
        catch { /* Fallback */ }
    }

    private YahooQuoteSummaryModulesDto BuildModulesDto(
        Dictionary<string, string> keyStatsData,
        Dictionary<string, string> profileData,
        Dictionary<string, string> financialsData,
        Dictionary<string, string> analysisData,
        List<YahooCompanyOfficerDto> companyOfficers,
        string? sector,
        string? industry,
        int? fullTimeEmployees,
        string? description)
    {
        var allStats = new Dictionary<string, string>(keyStatsData, StringComparer.OrdinalIgnoreCase);
        foreach (var (k, v) in profileData) allStats[k] = v;
        foreach (var (k, v) in financialsData) allStats[k] = v;
        foreach (var (k, v) in analysisData) allStats[k] = v;

        var assetProfile = new YahooAssetProfileDto(
            Address1: null, Address2: null, City: null, State: null, Zip: null, Country: null, Phone: null, Website: null,
            Industry: industry ?? GetString(allStats, "industry"),
            IndustryKey: null, IndustryDisp: null,
            Sector: sector ?? GetString(allStats, "sector"),
            SectorKey: null, SectorDisp: null,
            LongBusinessSummary: description,
            FullTimeEmployees: fullTimeEmployees,
            CompanyOfficers: companyOfficers.Count > 0 ? companyOfficers : null,
            AuditRisk: null, BoardRisk: null, CompensationRisk: null, ShareHolderRightsRisk: null, OverallRisk: null,
            GovernanceEpochDate: null, CompensationAsOfEpochDate: null
        );

        var defaultKeyStatistics = new YahooDefaultKeyStatisticsDto(
            PriceToBook: GetVal(allStats, "price/book", "price / book"),
            EnterpriseValue: GetVal(allStats, "enterprise value"),
            ForwardPE: GetVal(allStats, "forward p/e"),
            ProfitMargins: GetVal(allStats, "profit margin"),
            FloatShares: GetVal(allStats, "float"),
            SharesOutstanding: GetVal(allStats, "shares outstanding"),
            SharesShort: GetVal(allStats, "shares short"),
            SharesShortPriorMonth: GetVal(allStats, "shares short (prior month)"),
            SharesShortPreviousMonthDate: null, DateShortInterest: null,
            SharesPercentSharesOut: GetVal(allStats, "% of shares outstanding"),
            HeldPercentInsiders: GetVal(allStats, "% held by insiders"),
            HeldPercentInstitutions: GetVal(allStats, "% held by institutions"),
            ShortRatio: GetVal(allStats, "short ratio"),
            ShortPercentOfFloat: GetVal(allStats, "short % of float"),
            Beta: GetVal(allStats, "beta (5y monthly)", "beta"),
            Category: null,
            BookValue: GetVal(allStats, "book value per share", "book value"),
            PriceToSalesTrailing12Months: GetVal(allStats, "price/sales", "price / sales"),
            LastFiscalYearEnd: GetVal(allStats, "last fiscal year end"),
            NextFiscalYearEnd: GetVal(allStats, "next fiscal year end"),
            MostRecentQuarter: GetVal(allStats, "most recent quarter"),
            EarningsQuarterlyGrowth: GetVal(allStats, "quarterly earnings growth"),
            NetIncomeToCommon: GetVal(allStats, "net income avi to common"),
            TrailingEps: GetVal(allStats, "diluted eps"),
            ForwardEps: GetVal(allStats, "forward eps"),
            PegRatio: GetVal(allStats, "peg ratio", "peg ratio (5yr expected)"),
            EnterpriseToRevenue: GetVal(allStats, "enterprise value/revenue"),
            EnterpriseToEbitda: GetVal(allStats, "enterprise value/ebitda"),
            FiftyTwoWeekChange: GetVal(allStats, "52-week change"),
            SandP52WeekChange: GetVal(allStats, "s&p500 52-week change")
        );

        var financialData = new YahooFinancialDataDto(
            CurrentPrice: GetVal(allStats, "current price", "price"),
            TargetHighPrice: GetVal(allStats, "target high", "high target"),
            TargetLowPrice: GetVal(allStats, "target low", "low target"),
            TargetMeanPrice: GetVal(allStats, "target mean", "target est"),
            TargetMedianPrice: GetVal(allStats, "target median"),
            RecommendationMean: GetVal(allStats, "recommendation mean"),
            RecommendationKey: GetString(allStats, "recommendation key"),
            NumberOfAnalystOpinions: GetVal(allStats, "number of analysts"),
            TotalCash: GetVal(allStats, "total cash"),
            TotalCashPerShare: GetVal(allStats, "total cash per share"),
            Ebitda: GetVal(allStats, "ebitda"),
            TotalDebt: GetVal(allStats, "total debt"),
            QuickRatio: GetVal(allStats, "quick ratio"),
            CurrentRatio: GetVal(allStats, "current ratio"),
            TotalRevenue: GetVal(allStats, "revenue", "total revenue"),
            DebtToEquity: GetVal(allStats, "total debt/equity"),
            RevenuePerShare: GetVal(allStats, "revenue per share"),
            ReturnOnAssets: GetVal(allStats, "return on assets"),
            ReturnOnEquity: GetVal(allStats, "return on equity"),
            GrossProfits: GetVal(allStats, "gross profit"),
            FreeCashflow: GetVal(allStats, "levered free cash flow"),
            OperatingCashflow: GetVal(allStats, "operating cash flow"),
            RevenueGrowth: GetVal(allStats, "quarterly revenue growth"),
            GrossMargins: GetVal(allStats, "gross margin"),
            EbitdaMargins: GetVal(allStats, "ebitda margin"),
            OperatingMargins: GetVal(allStats, "operating margin"),
            ProfitMargins: GetVal(allStats, "profit margin"),
            FinancialCurrency: "USD"
        );

        var summaryDetail = new YahooSummaryDetailDto(
            MaxAge: 86400, PriceHint: null,
            PreviousClose: GetVal(allStats, "previous close"),
            Open: GetVal(allStats, "open"),
            DayLow: GetVal(allStats, "day low"),
            DayHigh: GetVal(allStats, "day high"),
            RegularMarketPreviousClose: GetVal(allStats, "previous close"),
            RegularMarketOpen: GetVal(allStats, "open"),
            RegularMarketDayLow: GetVal(allStats, "day low"),
            RegularMarketDayHigh: GetVal(allStats, "day high"),
            DividendRate: GetVal(allStats, "forward dividend & yield", "dividend rate"),
            DividendYield: GetVal(allStats, "dividend yield", "forward annual dividend yield", "trailing annual dividend yield"),
            ExDividendDate: GetVal(allStats, "ex-dividend date"),
            PayoutRatio: GetVal(allStats, "payout ratio"),
            FiveYearAvgDividendYield: GetVal(allStats, "5 year avg dividend yield"),
            Beta: GetVal(allStats, "beta"),
            TrailingPE: GetVal(allStats, "trailing p/e"),
            ForwardPE: GetVal(allStats, "forward p/e"),
            Volume: GetVal(allStats, "volume"),
            RegularMarketVolume: GetVal(allStats, "volume"),
            AverageVolume: GetVal(allStats, "avg. volume", "average volume"),
            AverageVolume10days: GetVal(allStats, "avg. volume (10 day)"),
            AverageDailyVolume10Day: GetVal(allStats, "avg. volume (10 day)"),
            Bid: GetVal(allStats, "bid"), Ask: GetVal(allStats, "ask"),
            BidSize: null, AskSize: null,
            MarketCap: GetVal(allStats, "market cap (intraday)", "market cap"),
            FiftyTwoWeekLow: GetVal(allStats, "52 week low"),
            FiftyTwoWeekHigh: GetVal(allStats, "52 week high"),
            PriceToSalesTrailing12Months: GetVal(allStats, "price/sales"),
            Currency: "USD"
        );

        return new YahooQuoteSummaryModulesDto(
            QuoteType: null,
            AssetProfile: assetProfile,
            FinancialData: financialData,
            DefaultKeyStatistics: defaultKeyStatistics,
            SummaryDetail: summaryDetail,
            IncomeStatementHistory: null,
            IncomeStatementHistoryQuarterly: null,
            BalanceSheetHistory: null,
            BalanceSheetHistoryQuarterly: null,
            CashflowStatementHistory: null,
            CashflowStatementHistoryQuarterly: null,
            CalendarEvents: null
        );
    }

    private static YahooValueDto? GetVal(Dictionary<string, string> dict, params string[] keys)
    {
        foreach (var k in keys)
        {
            if (dict.TryGetValue(k, out var val) && !string.IsNullOrWhiteSpace(val))
                return ParseYahooValue(val);

            var match = dict.FirstOrDefault(kvp => kvp.Key.Equals(k, StringComparison.OrdinalIgnoreCase) || kvp.Key.StartsWith(k, StringComparison.OrdinalIgnoreCase));
            if (!string.IsNullOrWhiteSpace(match.Value))
                return ParseYahooValue(match.Value);
        }
        return null;
    }

    private static string? GetString(Dictionary<string, string> dict, params string[] keys)
    {
        foreach (var k in keys)
        {
            if (dict.TryGetValue(k, out var val) && !string.IsNullOrWhiteSpace(val))
                return val.Trim();

            var match = dict.FirstOrDefault(kvp => kvp.Key.Equals(k, StringComparison.OrdinalIgnoreCase) || kvp.Key.StartsWith(k, StringComparison.OrdinalIgnoreCase));
            if (!string.IsNullOrWhiteSpace(match.Value))
                return match.Value.Trim();
        }
        return null;
    }

    /// <summary>
    /// Parsen von Suffixen (M, B, T, K) und Prozentwerten gemäß den funktionierenden Regex-Regeln.
    /// </summary>
    public static YahooValueDto? ParseYahooValue(string? text)
    {
        if (string.IsNullOrWhiteSpace(text) || text == "N/A" || text == "---" || text == "--" || text == "-")
            return null;

        var trimmed = text.Trim();
        bool isPercent = trimmed.EndsWith("%");

        double multiplier = 1.0;
        if (trimmed.EndsWith("T", StringComparison.OrdinalIgnoreCase)) multiplier = 1_000_000_000_000.0;
        else if (trimmed.EndsWith("B", StringComparison.OrdinalIgnoreCase)) multiplier = 1_000_000_000.0;
        else if (trimmed.EndsWith("M", StringComparison.OrdinalIgnoreCase)) multiplier = 1_000_000.0;
        else if (trimmed.EndsWith("K", StringComparison.OrdinalIgnoreCase)) multiplier = 1_000.0;

        // Beseitigt Einheiten und Tausenderpunkte, isoliert die reine Zahl mit Dezimalpunkt
        var numPart = Regex.Replace(trimmed, @"[^\d.-]", "");

        if (double.TryParse(numPart, NumberStyles.Any, CultureInfo.InvariantCulture, out double parsedVal))
        {
            double finalVal = isPercent ? (parsedVal / 100.0) : (parsedVal * multiplier);
            return new YahooValueDto
            {
                Raw = finalVal,
                Fmt = trimmed,
                LongFmt = finalVal.ToString("N0", CultureInfo.InvariantCulture)
            };
        }

        return null;
    }

    private record ProfileExtractionResult(
        Dictionary<string, string> ProfileDict,
        List<YahooCompanyOfficerDto> Officers,
        string? Sector,
        string? Industry,
        int? Employees,
        string? Description
    );

    private class ProfileMetaJsResult
    {
        public string? Sector { get; set; }
        public string? Industry { get; set; }
        public int? Employees { get; set; }
        public string? Description { get; set; }
        public List<OfficerJsResult>? Officers { get; set; }
    }

    private class OfficerJsResult
    {
        public string? Name { get; set; }
        public string? Title { get; set; }
        public string? Pay { get; set; }
        public string? Exercised { get; set; }
        public int? YearBorn { get; set; }
    }
}