using Microsoft.EntityFrameworkCore;
using Shadow.Data;
using Shadow.Entities;

namespace Shadow.Tools;
public class Seeder
{
	private readonly ApplicationDbContext db;
	private readonly GeneralUseHelpers guhf;

	public Seeder(ApplicationDbContext _db, GeneralUseHelpers _guhf)
	{
		db   = _db;
		guhf = _guhf;
	}
	public bool Seed()
	{
		// Will return true if application should be shut down.
		// Otherwise returns false.
		bool shutdown = false;

		Console.WriteLine($"You're running Shadow, commit {ThisAssembly.Git.Commit} of branch {ThisAssembly.Git.Branch} ({ThisAssembly.Git.CommitDate})\n");

		// Check if this is a clean, first run. If so, run the setup wizard.
		Global? lastVersion = db.Globals.FirstOrDefault(c => c.Key == "lastVersion");
		if (lastVersion is null)
		{
			shutdown = true;
			bool setupSuccessfull = false;
			Console.WriteLine("This seems to be a fresh install. Running setup wizard for you.\n");
			Cli cli = new(db, guhf, []);
			setupSuccessfull = cli.SetupWizard();

			if (setupSuccessfull)
			{
				// Cli.SetupWizard() takes care of musicLibraryPath and musicThumbnailPath
				lastVersion            = new Global() { Key = "lastVersion",     Value = ThisAssembly.Git.Commit };
				Global lastVersionDate = new Global() { Key = "lastVersionDate", Value = ThisAssembly.Git.CommitDate };
				Global runs            = new Global() { Key = "runs",            Value = "0" };
				Global libraryState    = new Global() { Key = "libraryState",    Value = "00000000000000000000000000000000" };
				db.Globals.AddRange(lastVersion, lastVersionDate, runs, libraryState);
			}
			else
				Console.WriteLine("Setup wizard failed. Please try running it again using \"Shadow setupWizard\".");

			db.SaveChanges();
			return shutdown;
		}

		// Check if running a newer (different) version
		if (lastVersion.Value != ThisAssembly.Git.Commit)
		{
			Global? lastVersionDate = db.Globals.FirstOrDefault(c => c.Key == "lastVersionDate");
			if (lastVersionDate is not null && String.Compare(lastVersionDate.Value, ThisAssembly.Git.CommitDate) > 0)
			{
				// User is running an earlier version of the application.
				Console.WriteLine("Downgrade detected! Waiting 30 seconds.\n" +
					"Please consider stopping Shadow in order to avoid accidental data loss!");
			}
			Console.WriteLine("Upgrade detected. Make sure you're using the most recent migrations.\n" +
				"If not, apply them with `dotnet ef database update`.");
		}

		// Check if any user/admin exist. Display appropriate warnings if not.
		int userCount = db.Users.Count();
		if (userCount == 0)
			Console.WriteLine("[Warn]: No user accounts found. Running a server no one can access! Consider creating an account with `Shadow addUser`.");

		int adminCount = db.Users.Count(u => u.IsAdmin());
		if (adminCount == 0 && userCount > 0)
			Console.WriteLine("[Warn]: No admin accounts exist. Consider creating one with `Shadow addUser`.");

		// Ensure [Unknown Album], [Unknown Artist] exist
		Album unknownAlbum = db.Albums.FirstOrDefault(a => a.Name == "[Unknown Album]") ?? new Album()
		{
			Name = "[Unknown Album]",
			Uri = "00000000000000000000000000000000"
		};

		Artist unknownArtist = db.Artists.FirstOrDefault(a => a.Name == "[Unknown Artist]") ?? new Artist()
		{
			Name = "[Unknown Artist]",
			NormalizedName = "[unknown artist]"
		};

		// UpdateRange works both as an Add and Update.
		db.UpdateRange(unknownAlbum, unknownArtist);
		db.SaveChanges();

		return shutdown;

	}
}