using System;
using System.Collections.Generic;
using System.IO;

namespace DalamudPython {
    public class Commands {
        public static readonly Dictionary<string, string> All = new() {
            ["/python"] = "Run a line of Python",
            ["/py"] = "Alias for /python",
            ["/pyprint"] = "Run a line of Python and print the result to the chat window",
            ["/pyadd"] = "Add a line of Python to a temporary script",
            ["/pyexecute"] = "Run the temporary script",
            ["/pyreset"] = "Clear the temporary script",
            ["/pyload"] = "Read the contents of a file relative to the config folder and run them as a Python script",
        };

        private Plugin Plugin { get; }

        private string? Script { get; set; }

        public Commands(Plugin plugin) {
            this.Plugin = plugin;
        }

        public void OnCommand(string name, string args) {
            switch (name) {
                case "/python":
                case "/py":
                case "/pyprint":
                    this.OneLiner(name, args);
                    break;
                case "/pyadd":
                    this.Add(args);
                    break;
                case "/pyexecute":
                    this.RunScript(args);
                    break;
                case "/pyreset":
                    this.Script = null;
                    break;
                case "/pyload":
                    this.LoadFile(args);
                    break;
            }
        }

        private void Add(string args) {
            this.Script ??= "";
            this.Script += args + "\n";
        }

        private void RunScript(string args) {
            var script = this.Script;
            if (script == null) {
                return;
            }

            var print = args == "print";

            try {
                this.Execute(script, print);
            } finally {
                this.Script = null;
            }
        }

        private void Execute(string script, bool print) {
            var scope = this.Plugin.Engine.CreateScope();
            scope.SetVariable("interface", this.Plugin.Interface);
            var fullScript = $@"import clr
from Dalamud import *
from Dalamud.Plugin import *
from Lumina import *
from Lumina.Excel.GeneratedSheets import *
{script}";
            var result = this.Plugin.Engine.Execute(fullScript, scope);

            if (!print) {
                return;
            }

            this.Plugin.Interface.Framework.Gui.Chat.Print(result.ToString());
        }

        private void OneLiner(string name, string args) {
            var print = name == "/pyprint";
            this.Execute(args, print);
        }

        private void LoadFile(string args) {
            if (string.IsNullOrWhiteSpace(args)) {
                return;
            }

            var scriptPath = Path.Combine(this.Plugin.ConfigDirectory, args);
            var script = File.ReadAllText(scriptPath);

            this.Execute(script, false);
        }
    }
}