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

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllers();

// Entity Framework - 使用 SQLite 進行測試
var useInMemoryDb = Environment.GetEnvironmentVariable("USE_INMEMORY_DB") == "true";
if (useInMemoryDb)
{
    builder.Services.AddDbContext<DramaLingDbContext>(options =>
        options.UseSqlite("Data Source=:memory:"));
}
else
{
    var connectionString = Environment.GetEnvironmentVariable("DRAMALING_DB_CONNECTION")
        ?? builder.Configuration.GetConnectionString("DefaultConnection")
        ?? "Data Source=dramaling_test.db"; // SQLite 檔案

    builder.Services.AddDbContext<DramaLingDbContext>(options =>
        options.UseSqlite(connectionString));
}

// Custom Services
builder.Services.AddScoped<IAuthService, AuthService>();
builder.Services.AddHttpClient<IGeminiService, GeminiService>();

// Authentication - 從環境變數讀取 JWT 配置
var supabaseUrl = Environment.GetEnvironmentVariable("DRAMALING_SUPABASE_URL")
    ?? builder.Configuration["Supabase:Url"]
    ?? "https://localhost";

var jwtSecret = Environment.GetEnvironmentVariable("DRAMALING_SUPABASE_JWT_SECRET")
    ?? builder.Configuration["Supabase:JwtSecret"]
    ?? "dev-secret-minimum-32-characters-long-for-jwt-signing-in-development-mode-only";

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = supabaseUrl,
            ValidAudience = "authenticated",
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtSecret))
        };
    });

// CORS for frontend
builder.Services.AddCors(options =>
{
    options.AddPolicy("AllowFrontend", policy =>
    {
        policy.WithOrigins("http://localhost:3000", "http://localhost:3001")
              .AllowAnyHeader()
              .AllowAnyMethod()
              .AllowCredentials()
              .SetPreflightMaxAge(TimeSpan.FromMinutes(5));
    });

    // 開發環境允許所有來源
    options.AddPolicy("AllowAll", policy =>
    {
        policy.AllowAnyOrigin()
              .AllowAnyHeader()
              .AllowAnyMethod();
    });
});

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new() { Title = "DramaLing API", Version = "v1" });

    // JWT Authentication for Swagger
    c.AddSecurityDefinition("Bearer", new Microsoft.OpenApi.Models.OpenApiSecurityScheme
    {
        Description = "JWT Authorization header using the Bearer scheme",
        Name = "Authorization",
        In = Microsoft.OpenApi.Models.ParameterLocation.Header,
        Type = Microsoft.OpenApi.Models.SecuritySchemeType.ApiKey,
        Scheme = "Bearer"
    });

    c.AddSecurityRequirement(new Microsoft.OpenApi.Models.OpenApiSecurityRequirement
    {
        {
            new Microsoft.OpenApi.Models.OpenApiSecurityScheme
            {
                Reference = new Microsoft.OpenApi.Models.OpenApiReference
                {
                    Type = Microsoft.OpenApi.Models.ReferenceType.SecurityScheme,
                    Id = "Bearer"
                }
            },
            Array.Empty<string>()
        }
    });
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI(c =>
    {
        c.SwaggerEndpoint("/swagger/v1/swagger.json", "DramaLing API v1");
        c.RoutePrefix = "swagger";
    });
}

// 開發環境使用寬鬆的 CORS 政策
if (app.Environment.IsDevelopment())
{
    app.UseCors("AllowAll");
}
else
{
    app.UseCors("AllowFrontend");
}

app.UseHttpsRedirection();

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

app.MapControllers();

// Health check endpoint
app.MapGet("/health", () => new { Status = "Healthy", Timestamp = DateTime.UtcNow });

// 確保資料庫已創建
using (var scope = app.Services.CreateScope())
{
    var context = scope.ServiceProvider.GetRequiredService<DramaLingDbContext>();
    try
    {
        context.Database.EnsureCreated();
        app.Logger.LogInformation("Database ensured created");
    }
    catch (Exception ex)
    {
        app.Logger.LogError(ex, "Error creating database");
    }
}

app.Run();