using BCards.Web.Models;
using MongoDB.Driver;
using System.Text;

namespace BCards.Web.Services;

public class ThemeService : IThemeService
{
    private readonly IMongoCollection<PageTheme> _themes;

    public ThemeService(IMongoDatabase database)
    {
        _themes = database.GetCollection<PageTheme>("themes");
    }

    public async Task<List<PageTheme>> GetAvailableThemesAsync()
    {
        return await _themes.Find(x => x.IsActive).ToListAsync();
    }

    public async Task<PageTheme?> GetThemeByIdAsync(string themeId)
    {
        return await _themes.Find(x => x.Id == themeId && x.IsActive).FirstOrDefaultAsync();
    }

    public async Task<PageTheme?> GetThemeByNameAsync(string themeName)
    {
        var theme = await _themes.Find(x => x.Name.ToLower() == themeName.ToLower() && x.IsActive).FirstOrDefaultAsync();
        return theme ?? GetDefaultTheme();
    }

    public Task<string> GenerateCustomCssAsync(PageTheme theme)
    {
        var css = $@"
            :root {{
                --primary-color: {theme.PrimaryColor};
                --secondary-color: {theme.SecondaryColor};
                --background-color: {theme.BackgroundColor};
                --text-color: {theme.TextColor};
            }}
            
            .user-page {{
                background-color: var(--background-color);
                color: var(--text-color);
                {(!string.IsNullOrEmpty(theme.BackgroundImage) ? $"background-image: url('{theme.BackgroundImage}');" : "")}
                background-size: cover;
                background-position: center;
                background-attachment: fixed;
            }}
            
            .profile-card {{
                background-color: rgba(255, 255, 255, 0.95);
                backdrop-filter: blur(10px);
                border-radius: 20px;
                padding: 2rem;
                box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            }}
            
            .profile-image {{
                width: 120px;
                height: 120px;
                border-radius: 50%;
                border: 4px solid var(--primary-color);
                object-fit: cover;
            }}
            
            .profile-name {{
                color: var(--primary-color);
                font-size: 2rem;
                font-weight: 600;
                margin-bottom: 0.5rem;
            }}
            
            .profile-bio {{
                color: var(--text-color);
                opacity: 0.8;
                margin-bottom: 2rem;
            }}
            
            .link-button {{
                background-color: var(--primary-color);
                color: white;
                border: none;
                padding: 1rem 2rem;
                border-radius: 50px;
                text-decoration: none;
                display: block;
                margin-bottom: 1rem;
                text-align: center;
                font-weight: 500;
                transition: all 0.3s ease;
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            }}
            
            .link-button:hover {{
                background-color: var(--secondary-color);
                transform: translateY(-2px);
                box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
                color: white;
                text-decoration: none;
            }}
            
            .link-title {{
                font-size: 1.1rem;
                margin-bottom: 0.25rem;
            }}
            
            .link-description {{
                font-size: 0.9rem;
                opacity: 0.9;
            }}
            
            @media (max-width: 768px) {{
                .profile-card {{
                    padding: 1.5rem;
                    margin: 1rem;
                }}
                
                .profile-image {{
                    width: 100px;
                    height: 100px;
                }}
                
                .profile-name {{
                    font-size: 1.75rem;
                }}
                
                .link-button {{
                    padding: 0.875rem 1.5rem;
                }}
            }}
        ";

        return Task.FromResult(css);
    }

    public async Task<string> GenerateThemeCSSAsync(PageTheme theme, UserPage page)
    {
        var css = new StringBuilder();
        
        // CSS base com variáveis do tema
        css.AppendLine($":root {{");
        css.AppendLine($"  --primary-color: {theme.PrimaryColor};");
        css.AppendLine($"  --secondary-color: {theme.SecondaryColor};");
        css.AppendLine($"  --background-color: {theme.BackgroundColor};");
        css.AppendLine($"  --text-color: {theme.TextColor};");
        css.AppendLine($"}}");
        
        // CSS específico por tema
        switch (theme.Name?.ToLower())
        {
            case "minimalista":
                css.AppendLine(GetMinimalistCSS());
                break;
            case "corporativo":
                css.AppendLine(GetCorporateCSS());
                break;
            case "dark mode":
                css.AppendLine(GetDarkCSS());
                break;
            case "natureza":
                css.AppendLine(GetNatureCSS());
                break;
            case "vibrante":
                css.AppendLine(GetVibrantCSS());
                break;
            default:
                css.AppendLine(await GenerateCustomCssAsync(theme));
                break;
        }
        
        return css.ToString();
    }

    private string GetMinimalistCSS() => @"
        .profile-card { 
            background: white; 
            box-shadow: 0 2px 10px rgba(0,0,0,0.1); 
            border-radius: 12px;
        }
        .link-button { 
            background: var(--primary-color); 
            border-radius: 8px; 
        }
    ";

    private string GetCorporateCSS() => @"
        .user-page { 
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%); 
        }
        .profile-card { 
            background: white; 
            box-shadow: 0 4px 20px rgba(0,0,0,0.1);
            border: 1px solid #e2e8f0;
        }
        .link-button { 
            background: var(--primary-color); 
            border-radius: 6px;
            font-weight: 600;
        }
    ";

    private string GetDarkCSS() => @"
        .user-page { 
            background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%); 
        }
        .profile-card { 
            background: rgba(255,255,255,0.1); 
            backdrop-filter: blur(15px);
            border: 1px solid rgba(255,255,255,0.2);
            color: #f9fafb;
        }
        .link-button { 
            background: var(--primary-color); 
            box-shadow: 0 4px 15px rgba(0,0,0,0.3); 
        }
        .profile-name, .profile-bio {
            color: #f9fafb;
        }
    ";

    private string GetNatureCSS() => @"
        .user-page { 
            background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
            background-image: url('data:image/svg+xml,<svg xmlns=""http://www.w3.org/2000/svg"" viewBox=""0 0 100 100""><defs><pattern id=""grain"" width=""100"" height=""100"" patternUnits=""userSpaceOnUse""><circle cx=""25"" cy=""25"" r=""1"" fill=""%23059669"" opacity=""0.1""/><circle cx=""75"" cy=""75"" r=""1"" fill=""%23059669"" opacity=""0.1""/></pattern></defs><rect width=""100"" height=""100"" fill=""url(%23grain)""/></svg>');
        }
        .profile-card { 
            background: rgba(255,255,255,0.9); 
            backdrop-filter: blur(10px);
            border: 1px solid rgba(34, 197, 94, 0.2);
        }
        .link-button { 
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 25px;
        }
    ";

    private string GetVibrantCSS() => @"
        .user-page { 
            background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 50%, #fecaca 100%);
        }
        .profile-card { 
            background: rgba(255,255,255,0.95); 
            box-shadow: 0 8px 32px rgba(220, 38, 38, 0.2);
            border: 2px solid rgba(220, 38, 38, 0.1);
        }
        .link-button { 
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 30px;
            transform: perspective(1000px) rotateX(0deg);
            transition: all 0.3s ease;
        }
        .link-button:hover {
            transform: perspective(1000px) rotateX(-5deg) translateY(-5px);
            box-shadow: 0 15px 30px rgba(220, 38, 38, 0.3);
        }
    ";

    public async Task InitializeDefaultThemesAsync()
    {
        var existingThemes = await _themes.Find(x => x.IsActive).ToListAsync();
        if (existingThemes.Any()) return;

        var defaultThemes = new[]
        {
            new PageTheme
            {
                Name = "Minimalista",
                PrimaryColor = "#2563eb",
                SecondaryColor = "#1d4ed8",
                BackgroundColor = "#ffffff",
                TextColor = "#1f2937",
                IsPremium = false,
                CssTemplate = "minimal"
            },
            new PageTheme
            {
                Name = "Dark Mode",
                PrimaryColor = "#10b981",
                SecondaryColor = "#059669",
                BackgroundColor = "#111827",
                TextColor = "#f9fafb",
                IsPremium = false,
                CssTemplate = "dark"
            },
            new PageTheme
            {
                Name = "Natureza",
                PrimaryColor = "#16a34a",
                SecondaryColor = "#15803d",
                BackgroundColor = "#f0fdf4",
                TextColor = "#166534",
                BackgroundImage = "/images/themes/nature-bg.jpg",
                IsPremium = false,
                CssTemplate = "nature"
            },
            new PageTheme
            {
                Name = "Corporativo",
                PrimaryColor = "#1e40af",
                SecondaryColor = "#1e3a8a",
                BackgroundColor = "#f8fafc",
                TextColor = "#0f172a",
                IsPremium = false,
                CssTemplate = "corporate"
            },
            new PageTheme
            {
                Name = "Vibrante",
                PrimaryColor = "#dc2626",
                SecondaryColor = "#b91c1c",
                BackgroundColor = "#fef2f2",
                TextColor = "#7f1d1d",
                IsPremium = true,
                CssTemplate = "vibrant"
            }
        };

        foreach (var theme in defaultThemes)
        {
            await _themes.InsertOneAsync(theme);
        }
    }

    public PageTheme GetDefaultTheme()
    {
        return new PageTheme
        {
            Name = "Padrão",
            PrimaryColor = "#2563eb",
            SecondaryColor = "#1d4ed8",
            BackgroundColor = "#ffffff",
            TextColor = "#1f2937",
            IsPremium = false,
            CssTemplate = "default"
        };
    }
}