using System.Text;
using D3ROVoice.Api.Data;
using D3ROVoice.Api.Services;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi;

var builder = WebApplication.CreateBuilder(args);
var serverStartTime = DateTime.UtcNow;

// Add Services to Container
builder.Services.AddControllers();
builder.Services.AddHttpClient();
builder.Services.AddEndpointsApiExplorer();

builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo
    {
        Title = "D3RO Voice Cloud API & BackOffice",
        Version = "v1",
        Description = "D3RO Voice Self-Hosted Cloud Backend for NAS & Docker"
    });
});

// Database Connection (SQLite with configurable NAS volume directory)
var dataDir = builder.Configuration["DATA_DIR"]
    ?? (Directory.Exists("/app/data") ? "/app/data" : Path.Combine(AppContext.BaseDirectory, "data"));

var dbPath = builder.Configuration["DB_PATH"]
    ?? builder.Configuration["DATABASE_PATH"]
    ?? Path.Combine(dataDir, "d3ro_api.db");

var dbDirectory = Path.GetDirectoryName(dbPath);
if (!string.IsNullOrEmpty(dbDirectory) && !Directory.Exists(dbDirectory))
{
    Directory.CreateDirectory(dbDirectory);
}

builder.Services.AddDbContext<AppDbContext>(options =>
    options.UseSqlite($"Data Source={dbPath}"));

// Services Registration
builder.Services.AddScoped<IAuthService, AuthService>();
builder.Services.AddScoped<ILlmProxyService, LlmProxyService>();
builder.Services.AddScoped<ISttProxyService, SttProxyService>();

// JWT Authentication Configuration
var secretKey = builder.Configuration["Jwt:SecretKey"] 
    ?? builder.Configuration["JWT_SECRET"]
    ?? "D3ROVoice_Super_Secure_Secret_Key_2026_Key!";
var keyBytes = Encoding.UTF8.GetBytes(secretKey);

builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.RequireHttpsMetadata = false;
    options.SaveToken = true;
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(keyBytes),
        ValidateIssuer = false,
        ValidateAudience = false,
        ClockSkew = TimeSpan.Zero
    };
});

builder.Services.AddCors(options =>
{
    options.AddPolicy("AllowAll", policy =>
    {
        policy.AllowAnyOrigin()
              .AllowAnyMethod()
              .AllowAnyHeader();
    });
});

var app = builder.Build();

// Ensure Database is Created & Initialized with default data
using (var scope = app.Services.CreateScope())
{
    var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
    db.Database.EnsureCreated();

    // Default Model Endpoints if empty
    if (!db.ModelEndpoints.Any())
    {
        db.ModelEndpoints.AddRange(
            new ServiceModelEndpoint
            {
                ModelId = "d3ro-gpt4o-mini",
                ModelName = "D3RO Standard Model (GPT-4o Mini)",
                Provider = "OpenAI",
                EndpointUrl = "https://api.openai.com/v1/chat/completions",
                CostPer1kPromptTokens = 0.00015m,
                CostPer1kCompletionTokens = 0.00060m,
                IsActive = true
            },
            new ServiceModelEndpoint
            {
                ModelId = "d3ro-claude-35-sonnet",
                ModelName = "D3RO Pro Model (Claude 3.5 Sonnet)",
                Provider = "Anthropic",
                EndpointUrl = "https://api.anthropic.com/v1/messages",
                CostPer1kPromptTokens = 0.00300m,
                CostPer1kCompletionTokens = 0.01500m,
                IsActive = true
            }
        );
        db.SaveChanges();
    }

    // Default STT Provider Endpoints if empty
    if (!db.SttProviderEndpoints.Any())
    {
        db.SttProviderEndpoints.AddRange(
            new SttProviderEndpoint
            {
                Name = "Groq Whisper LPU Turbo (Ultra Fast)",
                ProviderType = "groq",
                EndpointUrl = "https://api.groq.com/openai/v1/audio/transcriptions",
                ApiKey = builder.Configuration["GROQ_API_KEY"] ?? "",
                ModelId = "whisper-large-v3-turbo",
                Method = "multipart",
                Language = "ko",
                CostPerMinute = 0.000500m,
                CostPerSecond = 0.000008m,
                IsDefault = true,
                IsActive = true,
                FallbackPriority = 1,
                CreatedAt = DateTime.UtcNow
            },
            new SttProviderEndpoint
            {
                Name = "OpenAI Whisper Official",
                ProviderType = "openai",
                EndpointUrl = "https://api.openai.com/v1/audio/transcriptions",
                ApiKey = builder.Configuration["OPENAI_API_KEY"] ?? "",
                ModelId = "whisper-1",
                Method = "multipart",
                Language = "ko",
                CostPerMinute = 0.006000m,
                CostPerSecond = 0.000100m,
                IsDefault = false,
                IsActive = true,
                FallbackPriority = 2,
                CreatedAt = DateTime.UtcNow
            },
            new SttProviderEndpoint
            {
                Name = "Deepgram Nova-3 Industry Standard",
                ProviderType = "deepgram",
                EndpointUrl = "https://api.deepgram.com/v1/listen",
                ApiKey = builder.Configuration["DEEPGRAM_API_KEY"] ?? "",
                ModelId = "nova-3",
                Method = "binary-stream",
                Language = "ko",
                CostPerMinute = 0.004300m,
                CostPerSecond = 0.000072m,
                IsDefault = false,
                IsActive = true,
                FallbackPriority = 3,
                CreatedAt = DateTime.UtcNow
            },
            new SttProviderEndpoint
            {
                Name = "Google Gemini 2.0 Flash / Cloud STT",
                ProviderType = "google",
                EndpointUrl = "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent",
                ApiKey = builder.Configuration["GEMINI_API_KEY"] ?? builder.Configuration["GOOGLE_API_KEY"] ?? "",
                ModelId = "gemini-2.0-flash",
                Method = "json-base64",
                Language = "ko",
                CostPerMinute = 0.001000m,
                CostPerSecond = 0.000017m,
                IsDefault = false,
                IsActive = true,
                FallbackPriority = 4,
                CreatedAt = DateTime.UtcNow
            },
            new SttProviderEndpoint
            {
                Name = "Local Sidecar / Self-Hosted Whisper",
                ProviderType = "local-sidecar",
                EndpointUrl = "http://localhost:8971/stt/transcribe",
                ApiKey = "",
                ModelId = "whisper-large-v3-turbo",
                Method = "multipart",
                Language = "ko",
                CostPerMinute = 0.000000m,
                CostPerSecond = 0.000000m,
                IsDefault = false,
                IsActive = true,
                FallbackPriority = 5,
                CreatedAt = DateTime.UtcNow
            }
        );
        db.SaveChanges();
    }

    // Default Admin User seed & update password to Test1234!
    var adminUser = db.Users.FirstOrDefault(u => u.Email == "admin" || u.Email == "admin@d3ro.voice");
    var passwordHash = AuthService.HashPassword("Test1234!");
    if (adminUser == null)
    {
        db.Users.AddRange(
            new User
            {
                Email = "admin",
                PasswordHash = passwordHash,
                Role = "SuperAdmin",
                CreatedAt = DateTime.UtcNow,
                IsActive = true
            },
            new User
            {
                Email = "admin@d3ro.voice",
                PasswordHash = passwordHash,
                Role = "SuperAdmin",
                CreatedAt = DateTime.UtcNow,
                IsActive = true
            }
        );
        db.SaveChanges();
    }
    else
    {
        adminUser.PasswordHash = passwordHash;
        adminUser.Role = "SuperAdmin";
        adminUser.IsActive = true;
        db.SaveChanges();
    }
}

app.UseSwagger();
app.UseSwaggerUI();

app.UseCors("AllowAll");
app.UseDefaultFiles();
app.UseStaticFiles();

app.UseAuthentication();
app.UseAuthorization();

// Health Check Endpoints for Docker & NAS Container Monitoring
app.MapGet("/health", () => Results.Ok(new
{
    status = "Healthy",
    service = "D3RO Voice Cloud API",
    version = "1.0.0",
    uptimeSeconds = (DateTime.UtcNow - serverStartTime).TotalSeconds,
    database = File.Exists(dbPath) ? "Connected" : "Initializing",
    timestamp = DateTime.UtcNow
}));

app.MapGet("/api/health", () => Results.Ok(new
{
    status = "Healthy",
    service = "D3RO Voice Cloud API",
    version = "1.0.0",
    uptimeSeconds = (DateTime.UtcNow - serverStartTime).TotalSeconds,
    database = File.Exists(dbPath) ? "Connected" : "Initializing",
    timestamp = DateTime.UtcNow
}));

app.MapControllers();

// Fallback to Admin BackOffice UI index.html
app.MapFallbackToFile("/admin/{*path}", "admin/index.html");

app.Run();