using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Volo.Abp.Data;
using Volo.Abp.DependencyInjection;
using Volo.Abp.MultiTenancy;

namespace Syc.Basic.Web.WMS.Data;

public class WMSDbMigrationService : ITransientDependency
{
    public ILogger<WMSDbMigrationService> Logger { get; set; }

    private readonly IDataSeeder _dataSeeder;
    private readonly IEnumerable<IWMSDbSchemaMigrator> _dbSchemaMigrators;
    private readonly ICurrentTenant _currentTenant;

    public WMSDbMigrationService(
        IDataSeeder dataSeeder,
        IEnumerable<IWMSDbSchemaMigrator> dbSchemaMigrators,
        ICurrentTenant currentTenant)
    {
        _dataSeeder = dataSeeder;
        _dbSchemaMigrators = dbSchemaMigrators;
        _currentTenant = currentTenant;

        Logger = NullLogger<WMSDbMigrationService>.Instance;
    }

    public async Task MigrateAsync()
    {
        var initialMigrationAdded = AddInitialMigrationIfNotExist();

        if (initialMigrationAdded)
        {
            return;
        }

        Logger.LogInformation("Started database migrations...");

        Logger.LogInformation($"Successfully completed host database migrations.");

        Logger.LogInformation("Successfully completed all database migrations.");
        Logger.LogInformation("You can safely end this process...");
    }



    private bool AddInitialMigrationIfNotExist()
    {
        try
        {
            if (!DbMigrationsProjectExists())
            {
                return false;
            }
        }
        catch (Exception)
        {
            return false;
        }

        try
        {
            if (!MigrationsFolderExists())
            {
                AddInitialMigration();
                return true;
            }
            else
            {
                return false;
            }
        }
        catch (Exception e)
        {
            Logger.LogWarning("Couldn't determinate if any migrations exist : " + e.Message);
            return false;
        }
    }

    private bool DbMigrationsProjectExists()
    {
        var dbMigrationsProjectFolder = GetEntityFrameworkCoreProjectFolderPath();

        return dbMigrationsProjectFolder != null;
    }

    private bool MigrationsFolderExists()
    {
        var dbMigrationsProjectFolder = GetEntityFrameworkCoreProjectFolderPath();

        return Directory.Exists(Path.Combine(dbMigrationsProjectFolder, "Migrations"));
    }

    private void AddInitialMigration()
    {
        Logger.LogInformation("Creating initial migration...");

        string argumentPrefix;
        string fileName;

        if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX) || RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
        {
            argumentPrefix = "-c";
            fileName = "/bin/bash";
        }
        else
        {
            argumentPrefix = "/C";
            fileName = "cmd.exe";
        }

        var procStartInfo = new ProcessStartInfo(fileName,
            $"{argumentPrefix} \"abp create-migration-and-run-migrator \"{GetEntityFrameworkCoreProjectFolderPath()}\"\""
        );

        try
        {
            Process.Start(procStartInfo);
        }
        catch (Exception)
        {
            throw new Exception("Couldn't run ABP CLI...");
        }
    }

    private string GetEntityFrameworkCoreProjectFolderPath()
    {
        var slnDirectoryPath = GetSolutionDirectoryPath();

        if (slnDirectoryPath == null)
        {
            throw new Exception("Solution folder not found!");
        }

        var srcDirectoryPath = Path.Combine(slnDirectoryPath, "src");

        return Directory.GetDirectories(srcDirectoryPath)
            .FirstOrDefault(d => d.EndsWith(".EntityFrameworkCore"));
    }

    private string GetSolutionDirectoryPath()
    {
        var currentDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());

        while (Directory.GetParent(currentDirectory.FullName) != null)
        {
            currentDirectory = Directory.GetParent(currentDirectory.FullName);

            if (Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
            {
                return currentDirectory.FullName;
            }
        }

        return null;
    }
}