using System;
using System.IO;
using Microsoft.Extensions.Configuration;

namespace Sozsoft.Platform.Data.Seeds;

/// <summary>
/// Runtime'da duzenlenebilen seed dosyalarinin (SqlData / PostgresData / WizardData) klasorunu cozer.
/// <para>
/// Kod ile birlikte versiyonlanan sabit seed'ler (ornegin TenantDataSeeder'in okudugu
/// TenantData.json) buraya dahil degildir; onlar kendi projelerinin ciktisinda kalir.
/// </para>
/// <para>
/// Klasor bilincli olarak hicbir projenin icinde degildir: depoda <c>configs/seeds</c> altinda durur ve
/// konteynere bind mount ile baglanir. Boylece bir seed dosyasi degistiginde ne api ne de migrator
/// imaji yeniden derlenir; deploy sirasindaki <c>git pull</c> yeterlidir. Ayni klasor File Manager
/// uzerinden de duzenlenebildigi icin yapilan degisiklik dogrudan host diskinde kalici olur.
/// </para>
/// <para>
/// Cozum sirasi:
/// 1) <c>App:SeedsPath</c> ayari (konteynerde mount noktasi),
/// 2) calisma dizininden yukari dogru <c>configs/seeds</c> aramasi (local gelistirme),
/// 3) calisma dizininin altindaki <c>Seeds</c> klasoru (son care).
/// </para>
/// </summary>
public static class SeedPathResolver
{
    public const string ConfigurationKey = "App:SeedsPath";

    /// <summary>SQL Server saglayicisinin script klasoru.</summary>
    public const string SqlDataFolder = "SqlData";

    /// <summary>PostgreSQL saglayicisinin script klasoru.</summary>
    public const string PostgresDataFolder = "PostgresData";

    /// <summary>Host veritabani kapsamindaki scriptler.</summary>
    public const string HostDataFolder = "HostData";

    /// <summary>Tenant veritabani kapsamindaki scriptler.</summary>
    public const string TenantDataFolder = "TenantData";

    /// <summary>Yalnizca olusturulan/guncellenen nesne scriptleri.</summary>
    public const string ObjectDataFolder = "ObjectData";

    /// <summary>Olusturulan, ayrica tum migration'lar bittikten sonra calistirilan scriptler.</summary>
    public const string ExecuteDataFolder = "ExecuteData";

    /// <summary>Wizard'in urettigi konfigurasyon dosyalari.</summary>
    public const string WizardDataFolder = "WizardData";

    private const string RepositorySeedsFolder = "seeds";
    private const string RepositoryConfigsFolder = "configs";
    private const string FallbackFolderName = "Seeds";

    /// <summary>Seed kok klasorunun tam yolunu dondurur. Klasorun var olmasi garanti edilmez.</summary>
    public static string GetRootPath(IConfiguration? configuration)
    {
        var configuredPath = configuration?[ConfigurationKey];
        if (!string.IsNullOrWhiteSpace(configuredPath))
        {
            return Path.GetFullPath(configuredPath);
        }

        var repositoryPath = FindRepositorySeedsPath();
        if (repositoryPath != null)
        {
            return repositoryPath;
        }

        return Path.Combine(Directory.GetCurrentDirectory(), FallbackFolderName);
    }

    /// <summary>Seed kok klasorunun altindaki bir alt yolu dondurur.</summary>
    public static string GetPath(IConfiguration? configuration, params string[] subPaths)
    {
        var path = GetRootPath(configuration);

        foreach (var subPath in subPaths)
        {
            path = Path.Combine(path, subPath);
        }

        return path;
    }

    /// <summary>Calisma dizininden yukari dogru cikarak depodaki configs/seeds klasorunu arar.</summary>
    private static string? FindRepositorySeedsPath()
    {
        var dir = new DirectoryInfo(Directory.GetCurrentDirectory());

        while (dir != null)
        {
            var candidate = Path.Combine(dir.FullName, RepositoryConfigsFolder, RepositorySeedsFolder);
            if (Directory.Exists(candidate))
            {
                return candidate;
            }

            dir = dir.Parent;
        }

        return null;
    }
}