// copyright (c) 2020-2023 Roberto Ceccarelli - Casasoft
// http://strawberryfield.altervista.org
//
// This file is part of Casasoft Contemporary Carte de Visite Tools
// https://github.com/strawberryfield/Contemporary_CDV
//
// Casasoft CCDV Tools is free software:
// you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Casasoft CCDV Tools is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU AGPL v.3
// along with Casasoft CCDV Tools.  
// If not, see <http://www.gnu.org/licenses/>.

using Casasoft.CCDV.JSON;
using System.Reflection;

namespace Casasoft.CCDV.Scripting;

/// <summary>
/// Common script handling
/// </summary>
public class BaseScripting : IScripting
{
    /// <summary>
    /// Reference to json parameters
    /// </summary>
    public IParameters Parameters { get; set; }

    /// <summary>
    /// Template to be shown with --helpscript in <see cref="CommandLine"/>
    /// </summary>
    /// <returns></returns>
    public virtual string Template() => @"
/// <summary>
/// Custom class initialization
/// </summary>
public void Init() { }

/// <summary>
/// Image for final output
/// </summary>
/// <returns></returns>
public MagickImage OutputImage() => null;
";

    /// <summary>
    /// Template for ProcessOnLoad method
    /// </summary>
    public string ProcessOnLoadTemplate => @"
/// <summary>
/// Preprocesses the loaded image
/// </summary>
/// <param name=""image"">The loaded image</param>
/// <returns>The Processed image</returns>
public MagickImage ProcessOnLoad(MagickImage image) => image;";

    /// <summary>
    /// Script wrapping before execution
    /// </summary>
    /// <param name="script"></param>
    /// <param name="engine"></param>
    /// <returns></returns>
    public virtual string WrapScript(string script, string engine) => $@"{Compiler.Usings}
namespace Casasoft.CCDV.Scripts;

public class UserScript
{{
    private {engine} engine;
    public UserScript(IEngine eng)
    {{
        engine = ({engine})eng;
        System.Reflection.MethodInfo m = this.GetType().GetMethod(""Init"");
        if (m != null) m.Invoke(this, null);
    }}
{script}
}}";

    /// <summary>
    /// Script wrapping before execution
    /// </summary>
    /// <param name="script"></param>
    /// <returns></returns>
    public virtual string WrapScript(string script) => WrapScript(script, "BaseEngine");

    /// <summary>
    /// Run-time compilation
    /// </summary>
    /// <param name="script"></param>
    /// <returns></returns>
    public virtual Assembly Compile(string script) => Compiler.Compile(WrapScript(script));
}