using System;
using System.IO;
using System.IO.Compression;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text.RegularExpressions;
using DesertPaintCodex.Util;
using DesertPaintCodex.Services;

namespace DesertPaintCodex.Models
{
    public class PlayerProfile
    {
        private const string PaintRecipeFile = "dp_recipes.txt";
        private const string RibbonRecipeFile = "dp_ribbons.txt";
        
        private readonly string _reactFile;
        private readonly string _settingsFile;
        private readonly string _clipFile;

        private static readonly Regex _recipeHeaderRegex     = new(@"^--- Recipe: (?<colorname>(\w*\s)*\w+)\s*");
        private static readonly Regex _recipeIngredientRegex = new(@"(?<ingredient>(\w+\s)?\w+)\s*\|\s*(?<quantity>\d+)\s*");
        
        private Settings ProfileSettings { get; } = new();

        public string Directory { get; }

        public string Name { get; private set; }
        
        public ReactionSet Reactions { get; } = new();

        public Dictionary<string, Dictionary<string, ClipType>> Clippers { get; } = new();

        public string ReagentFile { get; }

        public Dictionary<string, PaintRecipe> Recipes { get; } = new();

        public Dictionary<string, PaintRecipe> RibbonRecipes { get; } = new();

        public int RecipeCount
        {
            get
            {
                int count = 0;
                foreach (PaintRecipe recipe in Recipes.Values)
                {
                    if (recipe.IsValidForConcentration(PaintRecipe.PaintRecipeMinConcentration))
                    {
                        ++count;
                    }
                }
                return count;
            }
        }

        public int RibbonCount
        {
            get
            {
                int count = 0;
                foreach (PaintRecipe recipe in RibbonRecipes.Values)
                {
                    if (recipe.IsValidForConcentration(PaintRecipe.RibbonRecipeMinConcentration))
                    {
                        ++count;
                    }
                }
                return count;
            }
        }
        
        public PlayerProfile(string name, string directory)
        {
            Name          = name;
            Directory     = directory;
            _reactFile    = Path.Combine(directory, "dp_reactions.txt");
            ReagentFile   = Path.Combine(directory, "ingredients.txt");
            _settingsFile = Path.Combine(directory, "settings");
            _clipFile     = Path.Combine(directory, "clips.txt");
            foreach (PaintColor color in PaletteService.Colors)
            {
                Recipes.Add(color.Name, new PaintRecipe());
            }
            foreach (PaintColor color in PaletteService.Colors)
            {
                RibbonRecipes.Add(color.Name, new PaintRecipe());
            }
        }

        public bool Initialize()
        {
            // Copy template files into new directory.
            string? templatePath = FileUtils.FindApplicationResourceDirectory("template");

            if (templatePath == null)
            {
                return false;
            }

            // Create new directory.
            System.IO.Directory.CreateDirectory(Directory);

            DirectoryInfo di = new(templatePath);
            FileInfo[] templateFiles = di.GetFiles();

            foreach (FileInfo file in templateFiles)
            {
                string destFile = Path.Combine(Directory, file.Name);
                File.Copy(file.FullName, destFile, true);
                if (!File.Exists(destFile)) return false;
            }
            return true;
        }

        private static void WriteReaction(TextWriter writer, string reagent1, string reagent2, string r, string g, string b)
        {
            writer.Write(reagent1);
            writer.Write(" ");
            writer.Write(reagent2);
            writer.Write(" ");
            writer.Write(r);
            writer.Write(" ");
            writer.Write(g);
            writer.Write(" ");
            writer.WriteLine(b);
        }

        public static void ConvertFromPP(string ppFile, string dpFile)
        {
            using StreamReader reader = new(ppFile);
            using StreamWriter writer = new(dpFile, false);
            string?            line;
            while ((line = reader.ReadLine()) != null)
            {
                string[] tokens = line.Split('|');
                //if ((tokens.Length > 0) && (tokens [0] != "//"))
                if ((tokens.Length == 5) && (tokens[0].Trim() != "//"))
                {
                    string reagent1  = tokens[0].Trim();
                    string reagent2  = tokens[1].Trim();
                    string colorCode = tokens[2].Trim();
                    string change1   = tokens[3].Trim();
                    string change2   = tokens[4].Trim();
                    // Write reaction.
                    switch (colorCode)
                    {
                        case "W":
                            WriteReaction(writer, reagent1, reagent2, change1, change1, change1);
                            WriteReaction(writer, reagent2, reagent1, change2, change2, change2);
                            break;
                        case "R":
                            WriteReaction(writer, reagent1, reagent2, change1, "0", "0");
                            WriteReaction(writer, reagent2, reagent1, change2, "0", "0");
                            break;
                        case "G":
                            WriteReaction(writer, reagent1, reagent2, "0", change1, "0");
                            WriteReaction(writer, reagent2, reagent1, "0", change2, "0");
                            break;
                        case "B":
                            WriteReaction(writer, reagent1, reagent2, "0", "0", change1);
                            WriteReaction(writer, reagent2, reagent1, "0", "0", change2);
                            break;
                    }
                }
            }
        }

        public bool SaveToPP(string ppFile)
        {
            Reaction? reaction1, reaction2;
            using (StreamWriter writer = new(ppFile))
            {
                foreach (string reagentName1 in ReagentService.Names)
                {
                    // TODO: could be more efficient by only iterating over the names after reagent1
                    foreach (string reagentName2 in ReagentService.Names)
                    {
                        if (reagentName1.Equals(reagentName2)) continue;

                        Reagent reagent1 = ReagentService.GetReagent(reagentName1);
                        Reagent reagent2 = ReagentService.GetReagent(reagentName2);
                        reaction1 = Reactions.Find(reagent1, reagent2);
                        
                        if (reaction1 is not {Exported: false}) continue;
                        
                        reaction2 = Reactions.Find(reagent2, reagent1);
                        
                        if (reaction2 == null) continue;
                        
                        writer.Write(reagent1.PracticalPaintName + " | " + reagent2.PracticalPaintName + " | ");
                        if ((Math.Abs(reaction1.Red) > Math.Abs(reaction1.Green)) ||
                            (Math.Abs(reaction2.Red) > Math.Abs(reaction2.Green)))
                        {
                            writer.WriteLine("R | " + reaction1.Red + " | " + reaction2.Red);
                        }
                        else if ((Math.Abs(reaction1.Green) > Math.Abs(reaction1.Red)) ||
                            (Math.Abs(reaction2.Green) > Math.Abs(reaction2.Red)))
                        {
                            writer.WriteLine("G | " + reaction1.Green + " | " + reaction2.Green);
                        }
                        else if ((Math.Abs(reaction1.Blue) > Math.Abs(reaction1.Red)) ||
                            (Math.Abs(reaction2.Blue) > Math.Abs(reaction2.Red)))
                        {
                            writer.WriteLine("B | " + reaction1.Blue + " | " + reaction2.Blue);
                        }
                        else
                        {
                            writer.WriteLine("W | " + reaction1.Red + " | " + reaction2.Red);
                        }
                        reaction1.Exported = true;
                        reaction2.Exported = true;
                    }
                }
            }

            // Clear Exported flags.
            foreach (string reagentName1 in ReagentService.Names)
            {
                // TODO: could be more efficient by only iterating over the names after reagent1
                foreach (string reagentName2 in ReagentService.Names)
                {
                    if (reagentName1.Equals(reagentName2))
                    {
                        continue;
                    }
                    Reagent reagent1 = ReagentService.GetReagent(reagentName1);
                    Reagent reagent2 = ReagentService.GetReagent(reagentName2);
                    reaction1 = Reactions.Find(reagent1, reagent2);
                    if (reaction1 != null)
                    {
                        reaction1.Exported = false;
                    }
                    reaction2 = Reactions.Find(reagent2, reagent1);
                    if (reaction2 != null)
                    {
                        reaction2.Exported = false;
                    }
                }
            }
            return true;
        }

        public void ImportFromPP(string reactionsFile)
        {
            // Convert old file.
            ConvertFromPP(reactionsFile, _reactFile);
            try
            {
                // If there is an ingredients file, move it in.
                string importDir = Path.GetDirectoryName(reactionsFile) ?? "";
                File.Copy(
                    Path.Combine(importDir, "ingredients.txt"),
                    Path.Combine(Directory, "ingredients.txt"),
                    true);
            }
            catch (Exception)
            {
                // If there is no ingredients file, we don't really care.	
            }
        }

        public void Import(string file)
        {
            if (!File.Exists(file))
            {
                Debug.WriteLine("Import file does not exist: " + file);
                // TODO: Show message dialog.
            }
            ZipFile.ExtractToDirectory(file, Directory, true);
        }

        public void Export(string file)
        {
            ZipFile.CreateFromDirectory(Directory, file);
        }

        public bool Load()
        {
            string? line;
            ProfileSettings.Reset();
            ProfileSettings.Load(_settingsFile);
            Reactions.Clear();
            if (File.Exists(ReagentFile))
            {
                ReagentService.LoadProfileReagents(ReagentFile);
            }
            else
            {
                return false;
            }
            ReagentService.InitializeReactions(Reactions);
            if (!File.Exists(_reactFile))
            {
                return false;
            }
            using (StreamReader reader = new(_reactFile))
            {
                while ((line = reader.ReadLine()) != null)
                {
                    string[] tokens = line.Split(' ');
                    if (tokens.Length == 5)
                    {
                        Reagent reagent1 = ReagentService.GetReagent(tokens[0].Trim());
                        Reagent reagent2 = ReagentService.GetReagent(tokens[1].Trim());
                        Reaction reaction = new(
                            int.Parse(tokens[2].Trim()),
                            int.Parse(tokens[3].Trim()),
                            int.Parse(tokens[4].Trim())
                            );
                        Reactions.Set(reagent1, reagent2, reaction);
                    }
                }
            }

            if (!File.Exists(_clipFile)) return true;
            {
                using StreamReader reader = new(_clipFile);
                while ((line = reader.ReadLine()) != null)
                {
                    string[] tokens = line.Split(' ');
                    
                    if (tokens.Length != 3) continue;
                    
                    string reagent1 = tokens[0].Trim();
                    if (!Clippers.ContainsKey(reagent1))
                    {
                        Clippers.Add(reagent1, new Dictionary<string, ClipType>());
                    }
                    Clippers[reagent1][tokens[1].Trim()] = (ClipType)int.Parse(tokens[2].Trim());
                }
            }

            return true;
        }

        public void Save()
        {
            ProfileSettings.Save(_settingsFile);
            Reaction? reaction;
            using (StreamWriter writer = new(_reactFile, false))
            {
                foreach (string reagentName1 in ReagentService.Names)
                {
                    // TODO: could be more efficient by only iterating over the names after reagent1
                    foreach (string reagentName2 in ReagentService.Names)
                    {
                        if (reagentName1.Equals(reagentName2))
                        {
                            continue;
                        }
                        Reagent reagent1 = ReagentService.GetReagent(reagentName1);
                        Reagent reagent2 = ReagentService.GetReagent(reagentName2);
                        reaction = Reactions.Find(reagent1, reagent2);
                        if (reaction != null)
                        {
                            writer.WriteLine(reagent1.PracticalPaintName + " " + reagent2.PracticalPaintName + " " +
                            reaction.Red + " " + reaction.Green + " " + reaction.Blue);
                        }
                    }
                }
            }
            using (StreamWriter writer = new(_clipFile, false))
            {
                foreach (var item1 in Clippers)
                {
                    foreach (var item2 in item1.Value)
                    {
                        if (item2.Value == ClipType.None) continue;
                        writer.WriteLine(item1.Key + " " + item2.Key + " " + (int)item2.Value);
                    }
                }
            }
        }

        public ClipType PairClipStatus(Reagent reagent1, Reagent reagent2)
        {
            if (Clippers.TryGetValue(reagent1.PracticalPaintName, out var item1))
            {
                if (item1.TryGetValue(reagent2.PracticalPaintName, out var clipType))
                {
                    return clipType;
                }
            }
            return ClipType.None;
        }

        public void SetPairClipStatus(Reagent reagent1, Reagent reagent2, ClipType clip)
        {
            if (Clippers.TryGetValue(reagent1.PracticalPaintName, out var item1))
            {
                if (item1.TryGetValue(reagent2.PracticalPaintName, out var clipType))
                {
                    if (clipType == clip) return;
                }
            }
            else
            {
                item1 = new Dictionary<string, ClipType>();
                Clippers.Add(reagent1.PracticalPaintName, item1);
            }

            item1[reagent2.PracticalPaintName] = clip;
            Save();
        }

        private void LoadRecipes(Dictionary<string, PaintRecipe> recipeDict, string filename, uint concentration)
        {
            foreach (PaintRecipe recipe in recipeDict.Values)
            {
                recipe.Clear();
            }
            string      recipeFile         = Path.Combine(Directory, filename);
            bool        inRecipe           = false;
            PaintRecipe testRecipe         = new();
            string?     currentRecipeColor = null;
            
            if (!File.Exists(recipeFile)) return;
            
            using StreamReader reader = new(recipeFile);
            
            string? line;
            while ((line = reader.ReadLine()) != null)
            {
                Match match = _recipeHeaderRegex.Match(line);
                if (match.Success)
                {
                    // Store previous recipe.
                    if ((currentRecipeColor != null) && testRecipe.IsValidForConcentration(concentration))
                    {
                        SetRecipe(currentRecipeColor, testRecipe);
                    }
                    testRecipe.Clear();
                    currentRecipeColor = match.Groups["colorname"].Value;
                    inRecipe  = true;
                }
                else if (inRecipe)
                {
                    match = _recipeIngredientRegex.Match(line);
                    
                    if (!match.Success) continue;
                    
                    string ingredient = match.Groups["ingredient"].Value;
                    uint   quantity   = uint.Parse(match.Groups["quantity"].Value);
                    
                    testRecipe.AddReagent(ingredient, quantity);
                }
            }

            if (!inRecipe || (currentRecipeColor == null)) return;
            
            // Store final recipe.
            if (testRecipe.IsValidForConcentration(concentration))
            {
                SetRecipe(currentRecipeColor, testRecipe);
            }
        }

        private void SaveRecipes(Dictionary<string, PaintRecipe> recipeDict, string filename)
        {
            string recipeFile = Path.Combine(Directory, filename);
            
            using StreamWriter writer = new(recipeFile, false);
            
            foreach (KeyValuePair<string, PaintRecipe> pair in recipeDict)
            {
                writer.WriteLine("--- Recipe: {0}", pair.Key);
                foreach (PaintRecipe.ReagentQuantity ingredient in pair.Value.Reagents)
                {
                    writer.WriteLine("{0,-14} | {1}", ingredient.Name, ingredient.Quantity);
                }
            }
        }

        private void DeleteRecipes(Dictionary<string, PaintRecipe> recipeDict, string filename)
        {
            string recipeFile = Path.Combine(Directory, filename);
            
            File.Delete(recipeFile);
            recipeDict.Clear();
        }

        public void LoadRecipes()
        {
            LoadRecipes(Recipes, PaintRecipeFile, PaintRecipe.PaintRecipeMinConcentration);
            LoadRecipes(RibbonRecipes, RibbonRecipeFile, PaintRecipe.RibbonRecipeMinConcentration);
        }

        public void SaveRecipes()
        {
            SaveRecipes(Recipes, PaintRecipeFile);
            SaveRecipes(RibbonRecipes, RibbonRecipeFile);
        }

        public void ClearRecipes()
        {
            DeleteRecipes(Recipes, PaintRecipeFile);
            DeleteRecipes(RibbonRecipes, RibbonRecipeFile);
        }

        public void ClearPaintRecipes()
        {
            DeleteRecipes(Recipes, PaintRecipeFile);
        }

        public void ClearRibbonRecipes()
        {
            DeleteRecipes(RibbonRecipes, RibbonRecipeFile);
        }

        public void ExportWikiRecipes(string file)
        {
            StreamWriter writer = new(file);
            ExportWikiFormat(writer, Recipes);
        }

        public void ExportWikiRibbons(string file)
        {
            StreamWriter writer = new StreamWriter(file);
            ExportWikiFormat(writer, this.RibbonRecipes);
        }

        public void ExportWikiRecipes(TextWriter writer)
        {
            ExportWikiFormat(writer, this.Recipes);
        }

        public void ExportWikiRibbons(TextWriter writer)
        {
            ExportWikiFormat(writer, this.RibbonRecipes);
        }
        
        public static void ExportWikiFormat(TextWriter writer, Dictionary<string, PaintRecipe> recipeDict)
        {
            using (writer)
            {
                writer.WriteLine("{| class='wikitable sortable' border=\"1\" style=\"background-color:#DEB887;\"");
                writer.WriteLine("! Color !! Recipe !! Missing Reactions? || Verified");
                foreach (PaintColor color in PaletteService.Colors)
                {
                    writer.WriteLine("|-");
                    string colorLine = "| ";
                    colorLine += "style=\"font-weight: bold; background-color: #" + color.Red.ToString("X2") + color.Green.ToString("X2") + color.Blue.ToString("X2") + ";";
                    
                    if (color.UseWhiteText)
                    {
                        // dark color gets light text
                        colorLine += " color: #FFFFFF;";
                    }
                    else
                    {
                        colorLine += "color: #000000;";
                    }
                    colorLine += "\" | " + color.Name + " || ";
                    if (recipeDict.TryGetValue(color.Name, out PaintRecipe? recipe))
                    {
                        foreach (PaintRecipe.ReagentQuantity ingredient in recipe.Reagents)
                        {
                            colorLine += " " + ingredient;
                        }
                    }
                    else
                    {
                        // no recipe
                    }
                    colorLine += " || ";

                    if (recipe == null)
                    {
                        colorLine += "?";
                    }
                    else if (recipe.HasMissingReactions())
                    {
                        colorLine += "Y";
                    }
                    else
                    {
                        colorLine += "N";
                    }

                    colorLine += " || N";
                    writer.WriteLine(colorLine);
                }
                writer.WriteLine("|}");
            }
        }

        public Reaction? FindReaction(Reagent? reagent1, Reagent? reagent2)
        {
            if ((reagent1 == null) || (reagent2 == null)) return null;
            return Reactions.Find(reagent1, reagent2);
        }

        public void SetReaction(Reagent reagent1, Reagent reagent2, Reaction reaction)
        {
            Reactions.Set(reagent1, reagent2, reaction);
        }

        public void ClearReaction(Reagent reagent1, Reagent reagent2)
        {
            Reactions.Remove(reagent1, reagent2);
        }

        public void SetRecipe(PaintRecipe recipe)
        {
            SetRecipe(PaletteService.FindNearest(recipe.ReactedColor), recipe);
        }

        public void SetRecipe(string colorName, PaintRecipe recipe)
        {
            if (Recipes.TryGetValue(colorName, out PaintRecipe? profileRecipe))
            {
                profileRecipe.CopyFrom(recipe);
            }
            else
            {
                Recipes.Add(colorName, new PaintRecipe(recipe));
            }
        }

        public void SetRibbonRecipe(PaintRecipe recipe)
        {
            SetRibbonRecipe(PaletteService.FindNearest(recipe.ReactedColor), recipe);
        }

        public void SetRibbonRecipe(string colorName, PaintRecipe recipe)
        {
            if (RibbonRecipes.TryGetValue(colorName, out PaintRecipe? profileRecipe))
            {
                profileRecipe.CopyFrom(recipe);
            }
            else
            {
                RibbonRecipes.Add(colorName, new PaintRecipe(recipe));
            }
        }
    }
}