DeutschLernen/GermanApp/Infrastructure/Data/SeedData/SeedDataExtension.cs

using GermanApp.Domain.Entities;
using GermanApp.Infrastructure.Data.DbContext;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;

namespace GermanApp.Infrastructure.Data.SeedData;

/// <summary>
/// Extension methods for seeding the database.
/// </summary>
public static class SeedDataExtension
{
    /// <summary>
    /// Seeds the database with initial data.
    /// </summary>
    /// <param name="app">The web application</param>
    public static async Task SeedDatabaseAsync(this WebApplication app)
    {
        using var scope = app.Services.CreateScope();
        var dbContext = scope.ServiceProvider.GetRequiredService<AppDbContext>();

        // Apply pending migrations
        dbContext.Database.Migrate();

        // Only seed if there are no users
        if (!dbContext.Users.Any())
        {
            // Get password hasher from service provider
            var passwordHasher = scope.ServiceProvider.GetRequiredService<IPasswordHasher<User>>();
            
            // Create temporary users for hashing (we need actual User objects)
            var tempAdminUser = User.Create("admin", "admin@deutschlernen.com", "");
            var tempTestUser = User.Create("testuser", "test@deutschlernen.com", "");
            
            // Hash passwords using ASP.NET Core Identity's PasswordHasher
            var adminPasswordHash = passwordHasher.HashPassword(tempAdminUser, "Admin@123!");
            var testPasswordHash = passwordHasher.HashPassword(tempTestUser, "Test@123!");

            // Seed CEFR levels first
            var levels = new[]
            {
                Level.Create("Beginner A1", "A1", 1),
                Level.Create("Elementary A2", "A2", 2),
                Level.Create("Intermediate B1", "B1", 3),
                Level.Create("Upper Intermediate B2", "B2", 4),
                Level.Create("Advanced C1", "C1", 5)
            };
            dbContext.Levels.AddRange(levels);
            await dbContext.SaveChangesAsync();

            // Seed an admin user with properly hashed password
            var adminUser = User.Create("admin", "admin@deutschlernen.com", adminPasswordHash);
            adminUser.AssignAdminRole();  // Set role to Admin
            adminUser.UpdateLevel("C1");
            dbContext.Users.Add(adminUser);

            // Seed a test user with properly hashed password
            var testUser = User.Create("testuser", "test@deutschlernen.com", testPasswordHash);
            dbContext.Users.Add(testUser);

            // Seed some lessons
            var lessons = new[]
            {
                Lesson.Create(1, "Greetings", 1, "Greetings", "Basic German greetings and introductions"),
                Lesson.Create(1, "Numbers", 2, "Numbers", "German numbers 1-100"),
                Lesson.Create(2, "Grammar Basics", 1, "Grammar", "Basic German grammar rules"),
                Lesson.Create(2, "Everyday Phrases", 2, "Phrases", "Common phrases for daily conversations"),
                Lesson.Create(5, "Advanced Grammar", 1, "Grammar", "Complex German grammar")
            };
            dbContext.Lessons.AddRange(lessons);

            await dbContext.SaveChangesAsync();

            // Seed quiz questions for the lessons
            dbContext.QuizQuestions.AddRange(new[]
            {
                // Questions for Greetings lesson (Lesson 1)
                QuizQuestion.Create(1, "What is the German word for 'Hello'?", QuestionType.FillInTheBlank, "Hallo", 1, 1),
                QuizQuestion.Create(1, "How do you say 'Good morning' in German?", QuestionType.FillInTheBlank, "Guten Morgen", 2, 2),
                QuizQuestion.Create(1, "What is the German word for 'Goodbye'?", QuestionType.MultipleChoice, "Auf Wiedersehen", 1, 3),
                // Questions for Numbers lesson (Lesson 2)
                QuizQuestion.Create(2, "What is '1' in German?", QuestionType.FillInTheBlank, "eins", 1, 1),
                QuizQuestion.Create(2, "What is '10' in German?", QuestionType.FillInTheBlank, "zehn", 2, 2),
                QuizQuestion.Create(2, "Which number is 'zwanzig'?", QuestionType.MultipleChoice, "20", 2, 3),
                // Questions for Grammar Basics lesson (Lesson 3)
                QuizQuestion.Create(3, "Is 'Der Mann' masculine?", QuestionType.TrueFalse, "True", 3, 1),
                QuizQuestion.Create(3, "What is the article for 'Frau'?", QuestionType.MultipleChoice, "die", 2, 2)
            });
            await dbContext.SaveChangesAsync();
            
            // Get the quiz question IDs after save
            var quizQuestions = await dbContext.QuizQuestions.OrderBy(q => q.Id).ToListAsync();
            
            // Add options for multiple choice questions
            // greetingsQ3 is ID 3 (3rd question created)
            dbContext.QuizOptions.AddRange(new[]
            {
                QuizOption.Create(quizQuestions[2].Id, "Hallo", false, 1),
                QuizOption.Create(quizQuestions[2].Id, "Danke", false, 2),
                QuizOption.Create(quizQuestions[2].Id, "Auf Wiedersehen", true, 3),
                QuizOption.Create(quizQuestions[2].Id, "Bitte", false, 4),
                // Numbers Q3 is ID 6
                QuizOption.Create(quizQuestions[5].Id, "10", false, 1),
                QuizOption.Create(quizQuestions[5].Id, "20", true, 2),
                QuizOption.Create(quizQuestions[5].Id, "30", false, 3),
                QuizOption.Create(quizQuestions[5].Id, "100", false, 4),
                // Grammar Q2 is ID 8
                QuizOption.Create(quizQuestions[7].Id, "der", false, 1),
                QuizOption.Create(quizQuestions[7].Id, "die", true, 2),
                QuizOption.Create(quizQuestions[7].Id, "das", false, 3)
            });
            await dbContext.SaveChangesAsync();

            Console.WriteLine("Database seeded with levels, admin user, test user, sample lessons, and quiz questions.");
        }
    }
}