Backend/e-suite.API/e-suite.Database.Migrator/Migrations/ScriptParser.cs

namespace e_suite.Database.Migrator.Migrations;

public class ScriptParser
{
    public static string GetScriptText(ScriptType scriptType, string databaseName)
    {
        var scriptFileName = Path.Combine(AppContext.BaseDirectory, "Scripts", GetScriptFileName(scriptType));

        if (!File.Exists(scriptFileName))
            return string.Empty;

        var fileContents = File.ReadAllText(scriptFileName).Trim();

        return ParseScript(fileContents, databaseName);
    }

    private static string ParseScript(string fileContents, string databaseName)
    {
        if (string.IsNullOrWhiteSpace(fileContents))
            return fileContents;
        
        var parameterDictionary = new Dictionary<string, string>
        {
            { "SQL_APPLICATION_USER", Environment.GetEnvironmentVariable("SQL_APPLICATION_USER") ?? $"{databaseName}ApplicationUser"  },
            { "SQL_APPLICATION_PASSWORD", Environment.GetEnvironmentVariable("SQL_APPLICATION_PASSWORD") ?? "Plz change me on live, thank you" },
            { "SQL_DATABASE", Environment.GetEnvironmentVariable("SQL_DATABASE") ?? databaseName },
            { "SQL_SERVER", Environment.GetEnvironmentVariable("SQL_SERVER") ?? string.Empty },
        };
        
        var parsedContents = fileContents;
        foreach (KeyValuePair<string, string> keyValuePair in parameterDictionary)
        {
            parsedContents = parsedContents.Replace("$(" + keyValuePair.Key + ")", keyValuePair.Value);
        }

        return parsedContents;
    }

    private static string GetScriptFileName(ScriptType scriptType)
    {
        return scriptType switch
        {
            ScriptType.resetDatabase => "ResetDatabaseScript.sql",
            ScriptType.preMigration => "PreMigrationScript.sql",
            ScriptType.postMigration => "PostMigrationScript.sql",
            _ => throw new NotImplementedException()
        };
    }
}