using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.Json;
using Toak.Serialization;

namespace Toak.Core.Skills;

public static class SkillRegistry
{
    public static List<ISkill> AllSkills = new List<ISkill>();

    public static string SkillsDirectory => Path.Combine(
        Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), 
        ".config", "toak", "skills");

    public static void Initialize()
    {
        if (!Directory.Exists(SkillsDirectory))
        {
            Directory.CreateDirectory(SkillsDirectory);
            CreateDefaultSkills();
        }

        AllSkills.Clear();
        foreach (var file in Directory.GetFiles(SkillsDirectory, "*.json"))
        {
            try
            {
                string json = File.ReadAllText(file);
                var def = JsonSerializer.Deserialize(json, AppJsonSerializerContext.Default.SkillDefinition);
                if (def != null)
                {
                    AllSkills.Add(new DynamicSkill(def));
                }
            }
            catch (Exception ex)
            {
                Logger.LogDebug($"Failed to load skill from {file}: {ex.Message}");
            }
        }
    }

    public static ISkill? DetectSkill(string transcript, IEnumerable<string> activeSkillNames)
    {
        if (AllSkills.Count == 0) Initialize();

        var activeSkills = AllSkills.Where(s => activeSkillNames.Contains(s.Name, StringComparer.OrdinalIgnoreCase)).ToList();
        string normalizedTranscript = transcript.Trim();
        
        foreach (var skill in activeSkills)
        {
            foreach (var hotword in skill.Hotwords)
            {
                if (normalizedTranscript.StartsWith(hotword, StringComparison.OrdinalIgnoreCase))
                {
                    return skill;
                }
            }
        }
        return null;
    }

    private static void CreateDefaultSkills()
    {
        var defaults = new List<SkillDefinition>
        {
            new SkillDefinition
            {
                Name = "Terminal",
                Description = "Executes the spoken command in your shell.",
                Hotwords = new[] { "System terminal", "System run", "System execute" },
                Action = "script",
                ScriptPath = "~/.config/toak/skills/terminal_action.sh",
                SystemPrompt = "You are a Linux terminal expert. Translate the user's request into a single, valid bash command. Output ONLY the raw command, no formatting, no markdown."
            },
            new SkillDefinition
            {
                Name = "Translate",
                Description = "Translates the spoken text into another language on the fly.",
                Hotwords = new[] { "System translate to", "System translate into" },
                Action = "type",
                SystemPrompt = @"You are an expert translator. The user wants to translate the following text.
The first few words identify the target language (e.g. 'Translate to Spanish:', 'Translate into Hungarian:').
Translate the REST of the transcript into that target language.
Output ONLY the final translated text. Do not include markdown, explanations, or quotes."
            },
            new SkillDefinition
            {
                Name = "Professional",
                Description = "Rewrites text into a formal, articulate tone.",
                Hotwords = new[] { "System professional", "System formalize", "System formal" },
                Action = "type",
                SystemPrompt = "Rewrite the following text to be articulate and formal. Do not add any conversational filler. Text: {transcript}"
            },
            new SkillDefinition
            {
                Name = "Summary",
                Description = "Provides a direct, crisp summary of the dictation.",
                Hotwords = new[] { "System summary", "System concise", "System summarize" },
                Action = "type",
                SystemPrompt = "Summarize the following text to be as concise and direct as possible. Remove all fluff. Text: {transcript}"
            }
        };

        foreach (var def in defaults)
        {
            string filename = Path.Combine(SkillsDirectory, $"{def.Name.ToLowerInvariant()}.json");
            string json = JsonSerializer.Serialize(def, AppJsonSerializerContext.Default.SkillDefinition);
            File.WriteAllText(filename, json);
        }

        // Create the default terminal wrapper script if it doesn't exist
        string scriptPath = Path.Combine(SkillsDirectory, "terminal_action.sh");
        if (!File.Exists(scriptPath))
        {
            File.WriteAllText(scriptPath, "#!/bin/bash\n\n# Terminal skill wrapper script.\n# The LLM output is passed as the first argument ($1).\nx-terminal-emulator -e bash -c \"$1; exec bash\"\n");
            
            // Try to make it executable
            try {
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo {
                    FileName = "chmod",
                    Arguments = $"+x \"{scriptPath}\"",
                    CreateNoWindow = true,
                    UseShellExecute = false
                })?.WaitForExit();
            } catch { }
        }
    }
}