using System.Net;
using Manager.App.Models.Library;
using Manager.YouTube;
using Microsoft.AspNetCore.Components;
using MudBlazor;

namespace Manager.App.Components.Dialogs
{
    public partial class AccountDialog : ComponentBase
    {
        [CascadingParameter] private IMudDialogInstance? MudDialog { get; set; }
        [Parameter] public string DefaultUserAgent { get; set; } = "";
        private ClientPrep? PreparingClient { get; set; }
        private CookieCollection ImportCookies { get; set; } = [];
        private bool _isLoading;
        private AccountImportSteps _steps = AccountImportSteps.Authenticate;

        private bool _cookieImportTextValid;
        private string _cookieText = "";
        private string _cookieDomain = ".youtube.com";
        
        private bool CanSave()
        {
            return PreparingClient?.YouTubeClient?.State?.LoggedIn == true;
        }

        private bool CanContinue()
        {
            switch (_steps)
            {
                case AccountImportSteps.Authenticate:
                    if (ImportCookies.Count != 0)
                    {
                        return true;
                    }
                    break;
                case AccountImportSteps.Validate:
                    if (PreparingClient?.YouTubeClient?.State?.LoggedIn == true)
                    {
                        return true;
                    }
                    break;
            }
            return false;
        }

        private async Task OnNextStep()
        {
            switch (_steps)
            {
                case AccountImportSteps.Authenticate:
                    if (CanContinue())
                    {
                        _steps = AccountImportSteps.Validate;
                        await BuildClient();
                        await InvokeAsync(StateHasChanged);
                        return;
                    }
                    SnackbarService.Add("Cannot continue!", Severity.Warning);
                    break;
                case AccountImportSteps.Validate:
                    if (CanSave())
                    {
                        MudDialog?.Close(DialogResult.Ok(PreparingClient));
                        await InvokeAsync(StateHasChanged);
                        return;
                    }
                    SnackbarService.Add("Cannot save!", Severity.Warning);
                    break;
            }
            await InvokeAsync(StateHasChanged);
        }

        private void ParseCookies()
        {
            try
            {
                ImportCookies.Clear();
                ImportCookies.Add(ParseCookieHeader(_cookieText, _cookieDomain));
                _cookieText = string.Empty;
            }
            catch (Exception e)
            {
                SnackbarService.Add($"Parsing cookies failed: {e.Message}", Severity.Error);
            }
            StateHasChanged();
        }

        private void ClearPreparedClient()
        {
            PreparingClient?.YouTubeClient?.Dispose();
            PreparingClient = null;
            ImportCookies.Clear();
            _steps = AccountImportSteps.Authenticate;
            StateHasChanged();
        }

        private static string? ValidateCookieText(string text)
        {
            if (string.IsNullOrWhiteSpace(text))
                return "Cookies are required";

            var pairs = text.Split(';', StringSplitOptions.RemoveEmptyEntries);
            foreach (var pair in pairs)
            {
                if (!pair.Contains('=')) return "Invalid.";
                var key = pair[..pair.IndexOf('=')].Trim();
                if (string.IsNullOrEmpty(key)) return "Invalid.";
            }

            return null;
        }

        public static CookieCollection ParseCookieHeader(string cookieHeader, string domain = "")
        {
            var collection = new CookieCollection();

            if (string.IsNullOrWhiteSpace(cookieHeader))
                return collection;

            var cookies = cookieHeader.Split(';', StringSplitOptions.RemoveEmptyEntries);

            foreach (var cookieStr in cookies)
            {
                var parts = cookieStr.Split('=', 2);
                if (parts.Length != 2) continue;
                
                var name = parts[0].Trim();
                var value = parts[1].Trim();

                var cookie = new Cookie(name, value)
                {
                    Path = "/",
                    Domain = domain
                };
                collection.Add(cookie);
            }

            return collection;
        }
        
        private async Task BuildClient()
        {
            _isLoading = true;
            PreparingClient = new ClientPrep();
            var clientResult = await YouTubeClient.CreateAsync(ImportCookies, DefaultUserAgent);
            if (clientResult.IsSuccess)
            {
                PreparingClient.YouTubeClient = clientResult.Value;
            }

            if (PreparingClient.YouTubeClient == null)
            {
                SnackbarService.Add("Failed to get client!", Severity.Error);
                _isLoading = false;
                return;
            }

            var accountResult = await PreparingClient.YouTubeClient.GetChannelByIdAsync(PreparingClient.YouTubeClient.Id);
            if (accountResult.IsSuccess)
            {
                PreparingClient.Channel = accountResult.Value;
            }
            _isLoading = false;
            await InvokeAsync(StateHasChanged);
        }
    }

    public enum AccountImportSteps
    {
        Authenticate,
        Validate
    }
}