using Adaptation.FileHandlers.json.WorkItems;
using Adaptation.Shared;
using Adaptation.Shared.Duplicator;
using Adaptation.Shared.Methods;
using log4net;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Adaptation.FileHandlers.Markdown;

#nullable enable

public class ProcessData : IProcessData
{

    private readonly List<object> _Details;

    List<object> Shared.Properties.IProcessData.Details => _Details;

    private readonly ILog _Log;

    string IProcessData.GetCurrentReactor(IFileRead fileRead, Logistics logistics, Dictionary<string, string> reactors) =>
        throw new Exception(string.Concat("See ", nameof(WriteFiles)));

    Tuple<string, Test[], JsonElement[], List<FileInfo>> IProcessData.GetResults(IFileRead fileRead, Logistics logistics, List<FileInfo> fileInfoCollection) =>
        new(logistics.Logistics1[0], Array.Empty<Test>(), Array.Empty<JsonElement>(), fileInfoCollection);

    private static string GetClosed(WorkItem workItem) =>
        workItem.State != "Closed" ? "[ ]" : "[x]";

    public ProcessData(IFileRead fileRead, Logistics logistics, string targetFileLocation, string url, ReadOnlyCollection<string> workItemTypes, List<FileInfo> fileInfoCollection)
    {
        _Details = new List<object>();
        _Log = LogManager.GetLogger(typeof(ProcessData));
        if (fileRead.IsEAFHosted)
            WriteFiles(fileRead, logistics, url, workItemTypes, targetFileLocation, fileInfoCollection);
    }

    private static void WriteFiles(IFileRead fileRead, string destinationDirectory, List<FileInfo> fileInfoCollection, ReadOnlyCollection<string> lines, ReadOnlyCollection<Record> records, string fileName)
    {
        string markdown = string.Join(Environment.NewLine, lines);
        string markdownFile = Path.Combine(destinationDirectory, $"{fileName}.md");
        string markdownOld = !File.Exists(markdownFile) ? string.Empty : File.ReadAllText(markdownFile);
        if (markdown != markdownOld)
            File.WriteAllText(markdownFile, markdown);
        if (!fileRead.IsEAFHosted)
            fileInfoCollection.Add(new(markdownFile));
        string html = CommonMark.CommonMarkConverter.Convert(markdown).Replace("<a href", "<a target='_blank' href");
        string htmlFile = Path.Combine(destinationDirectory, $"{fileName}.html");
        string htmlOld = !File.Exists(htmlFile) ? string.Empty : File.ReadAllText(htmlFile);
        if (html != htmlOld)
            File.WriteAllText(htmlFile, html);
        if (!fileRead.IsEAFHosted)
            fileInfoCollection.Add(new(htmlFile));
        string json = JsonSerializer.Serialize(records, new JsonSerializerOptions() { WriteIndented = true });
        string jsonFile = Path.Combine(destinationDirectory, $"{fileName}.json");
        string jsonOld = !File.Exists(jsonFile) ? string.Empty : File.ReadAllText(jsonFile);
        if (json != jsonOld)
            File.WriteAllText(jsonFile, json);
        if (!fileRead.IsEAFHosted)
            fileInfoCollection.Add(new(jsonFile));
    }

    private void WriteFiles(IFileRead fileRead, Logistics logistics, string url, ReadOnlyCollection<string> workItemTypes, string destinationDirectory, List<FileInfo> fileInfoCollection)
    {
        if (!Directory.Exists(destinationDirectory))
            _ = Directory.CreateDirectory(destinationDirectory);
        string json = File.ReadAllText(logistics.ReportFullPath);
        // WorkItem[]? workItems = JsonSerializer.Deserialize<WorkItem[]>(json);
        // if (workItems is null)
        //     throw new Exception(nameof(workItems));
        JsonElement[]? jsonElements = JsonSerializer.Deserialize<JsonElement[]>(json);
        if (jsonElements is null)
            throw new Exception(nameof(jsonElements));
        WorkItem? workItem;
        List<WorkItem> workItems = new();
        foreach (JsonElement jsonElement in jsonElements)
        {
            workItem = JsonSerializer.Deserialize<WorkItem>(jsonElement.ToString());
            if (workItem is null)
                continue;
            workItems.Add(workItem);
        }
        List<char> spaces = new();
        bool keepRelations = false;
        List<string> lines = new();
        List<string> messages = new();
        ReadOnlyCollection<Record> results;
        ReadOnlyDictionary<int, Record> keyValuePairs = GetWorkItems(workItems, keepRelations);
        ReadOnlyCollection<Record> records = new(keyValuePairs.Values.ToArray());
        ReadOnlyCollection<string> userStoryWorkItemTypes = new(new string[] { "User Story" });
        ReadOnlyCollection<string> bugFeatureWorkItemTypes = new(new string[] { "Bug", "Feature" });
        ReadOnlyCollection<string> bugUserStoryWorkItemTypes = new(new string[] { "Bug", "User Story" });
        messages.AddRange(WriteFile(fileRead, destinationDirectory, fileInfoCollection, records, "records"));
        messages.AddRange(WriteWithParentsFile(fileRead, destinationDirectory, fileInfoCollection, records, bugFeatureWorkItemTypes, "bugs-features-with-parents"));
        messages.AddRange(WriteWithParentsFile(fileRead, destinationDirectory, fileInfoCollection, records, bugUserStoryWorkItemTypes, "bugs-user-stories-with-parents"));
        foreach (string workItemType in workItemTypes)
        {
            lines.Clear();
            lines.Add($"# {workItemType}");
            lines.Add(string.Empty);
            AppendLines(url, spaces, lines, records, workItemType);
            results = new(Array.Empty<Record>());
            WriteFiles(fileRead, destinationDirectory, fileInfoCollection, new(lines), results, workItemType);
            _Details.Add(results);
        }
        {
            lines.Clear();
            string workItemType = "User Story";
            lines.Add($"# Total User Story Points by Site - Iteration - Assigned To (Initials)");
            lines.Add(string.Empty);
            results = UserStoryCheckIterationPath228385(url, lines, userStoryWorkItemTypes, keyValuePairs, workItemType);
            WriteFiles(fileRead, destinationDirectory, fileInfoCollection, new(lines), results, $"{workItemType} check 228385");
            _Details.Add(results);
        }
        if (messages.Count > 0)
            throw new Exception($"{messages.Count}{Environment.NewLine}{string.Join(Environment.NewLine, messages)}");
    }

    private static ReadOnlyDictionary<int, Record> GetWorkItems(IEnumerable<WorkItem> workItems, bool keepRelations)
    {
        ReadOnlyDictionary<int, Record> results;
        Dictionary<int, WorkItem> keyValuePairs = new();
        foreach (WorkItem workItem in workItems)
            keyValuePairs.Add(workItem.Id, workItem);
        results = GetKeyValuePairs(new(keyValuePairs), keepRelations);
        return results;
    }

    private static ReadOnlyDictionary<int, Record> GetKeyValuePairs(ReadOnlyDictionary<int, WorkItem> keyValuePairs, bool keepRelations)
    {
        Dictionary<int, Record> results = new();
        Record record;
        List<bool> nests = new();
        WorkItem? parentWorkItem;
        ReadOnlyCollection<Record> childRecords;
        ReadOnlyCollection<Record> relatedRecords;
        ReadOnlyCollection<Record> successorRecords;
        foreach (KeyValuePair<int, WorkItem> keyValuePair in keyValuePairs)
        {
            nests.Clear();
            if (keyValuePair.Value.Parent is null)
                parentWorkItem = null;
            else
                _ = keyValuePairs.TryGetValue(keyValuePair.Value.Parent.Value, out parentWorkItem);
            try
            {
                childRecords = Record.GetKeyValuePairs(keyValuePairs, keyValuePair.Value, "Child", nests, keepRelations); // Forward
                relatedRecords = Record.GetKeyValuePairs(keyValuePairs, keyValuePair.Value, "Related", nests, keepRelations); // Related
                successorRecords = Record.GetKeyValuePairs(keyValuePairs, keyValuePair.Value, "Successor", nests, keepRelations); // Forward
                // predecessorRecords = Record.GetKeyValuePairs(keyValuePairs, keyValuePair.Value, "Predecessor", nests, keepRelations); // Reverse
                record = Record.Get(keyValuePair.Value, parentWorkItem, childRecords, relatedRecords, successorRecords, keepRelations);
            }
            catch (Exception)
            {
                Dictionary<string, string>? tag = null;
                record = new(keyValuePair.Value, parentWorkItem, Array.Empty<Record>(), Array.Empty<Record>(), Array.Empty<Record>(), tag);
            }
            results.Add(keyValuePair.Key, record);
        }
        return new(results);
    }

    private static ReadOnlyCollection<string> WriteFile(IFileRead fileRead, string destinationDirectory, List<FileInfo> fileInfoCollection, ReadOnlyCollection<Record> records, string fileName)
    {
        List<string> results = new();
        string? json = GetJson(records, results);
        string jsonFile = Path.Combine(destinationDirectory, $"{fileName}.json");
        string jsonOld = !File.Exists(jsonFile) ? string.Empty : File.ReadAllText(jsonFile);
        if (!string.IsNullOrEmpty(json) && json != jsonOld)
            File.WriteAllText(jsonFile, json);
        if (!fileRead.IsEAFHosted)
            fileInfoCollection.Add(new(jsonFile));
        return new(results);
    }

    private static ReadOnlyCollection<string> WriteWithParentsFile(IFileRead fileRead, string destinationDirectory, List<FileInfo> fileInfoCollection, ReadOnlyCollection<Record> records, ReadOnlyCollection<string> workItemTypes, string fileName)
    {
        List<string> results = new();
        Record record;
        List<Record> filtered = new();
        foreach (Record r in records)
        {
            if (r.WorkItem.State == "Removed" || !workItemTypes.Contains(r.WorkItem.WorkItemType))
                continue;
            record = new(r.WorkItem, r.Parent, Array.Empty<Record>(), Array.Empty<Record>(), Array.Empty<Record>(), r.Tag);
            filtered.Add(record);
        }
        string? json = GetJson(filtered, results);
        string jsonFile = Path.Combine(destinationDirectory, $"{fileName}.json");
        string jsonOld = !File.Exists(jsonFile) ? string.Empty : File.ReadAllText(jsonFile);
        if (!string.IsNullOrEmpty(json) && json != jsonOld)
            File.WriteAllText(jsonFile, json);
        if (!fileRead.IsEAFHosted)
            fileInfoCollection.Add(new(jsonFile));
        return new(results);
    }

    private static string? GetJson(IEnumerable<Record> records, List<string> results)
    {
        string? result;
        try
        { result = JsonSerializer.Serialize(records.ToArray(), RecordCollectionSourceGenerationContext.Default.RecordArray); }
        catch (Exception)
        {
            result = null;
            foreach (Record record in records)
            {
                try
                { _ = JsonSerializer.Serialize(record, RecordSourceGenerationContext.Default.Record); }
                catch (Exception ex)
                { results.Add($"Record {record.WorkItem.Id} is not serializable!{Environment.NewLine}{ex.Message}"); }
            }
        }
        return result;
    }

    private static void AppendLines(List<char> spaces, List<string> lines, Record record, bool condensed, bool sprintOnly)
    {
        string line;
        spaces.Add('\t');
        WorkItem workItem;
        if (record.Children is not null)
        {
            foreach (Record child in record.Children)
            {
                workItem = child.WorkItem;
                line = GetLine(spaces, workItem, child, condensed, sprintOnly).TrimEnd();
                lines.Add(line);
                AppendLines(spaces, lines, child, condensed, sprintOnly);
            }
        }
        spaces.RemoveAt(0);
    }

    private static void AppendLines(string url, List<char> spaces, List<string> lines, ReadOnlyCollection<Record> records, string workItemType)
    {
        List<string> results = new();
        string? maxIterationPath;
        List<string> distinct = new();
        foreach (Record record in records)
        {
            // if (record.WorkItem.Id != 109724)
            //     continue;
            if (record.WorkItem.WorkItemType != workItemType)
                continue;
            results.Add($"## {record.WorkItem.AssignedTo} - {record.WorkItem.Id} - {record.WorkItem.Title}");
            results.Add(string.Empty);
            results.Add($"- [{record.WorkItem.Id}]({url}{record.WorkItem.Id})");
            if (record.Children is null || record.Children.Length == 0)
                results.Add(string.Empty);
            else
            {
                AppendLines(spaces, results, record, condensed: true, sprintOnly: false);
                results.Add(string.Empty);
                distinct.Clear();
                AppendLines(spaces, distinct, record, condensed: false, sprintOnly: true);
                if (distinct.Count > 1)
                {
                    results.Add($"## Distinct Iteration Path(s) - {record.WorkItem.WorkItemType} - {record.WorkItem.AssignedTo} - {record.WorkItem.Id} - {record.WorkItem.Title} - {record.WorkItem.IterationPath}");
                    results.Add(string.Empty);
                    results.Add($"- [{record.WorkItem.Id}]({url}{record.WorkItem.Id})");
                    distinct.Sort();
                    distinct = (from l in distinct select l.Trim()).Distinct().ToList();
                    results.AddRange(distinct);
                    results.Add(string.Empty);
                    maxIterationPath = distinct.Max();
                    if (!string.IsNullOrEmpty(maxIterationPath) && maxIterationPath.Contains("] ") && maxIterationPath.Split(']')[1].Trim() != record.WorkItem.IterationPath)
                    {
                        results.Add($"### Sync to Distinct Max Iteration Path => {maxIterationPath} - {record.WorkItem.Id} - {record.WorkItem.Title}");
                        results.Add(string.Empty);
                    }
                }
                results.Add($"## Extended - {record.WorkItem.Id} - {record.WorkItem.Title}");
                results.Add(string.Empty);
                AppendLines(spaces, results, record, condensed: false, sprintOnly: false);
                results.Add(string.Empty);
            }
            lines.AddRange(results);
            results.Clear();
        }
    }

    private static string GetLine(List<char> spaces, WorkItem workItem, Record record, bool condensed, bool sprintOnly)
    {
        string result;
        string closed = GetClosed(workItem);
        result = sprintOnly ? $"\t- [ ] {workItem.IterationPath}" :
            condensed ? $"{new string(spaces.Skip(1).ToArray())}- {closed} {record.WorkItem.Id} - {workItem.Title}" :
            $"{new string(spaces.Skip(1).ToArray())}- {closed} {record.WorkItem.Id} - {workItem.Title} ~~~ {workItem.AssignedTo} - {workItem.IterationPath.Replace('\\', '-')} - {workItem.CreatedDate} --- {workItem.ClosedDate}";
        return result;
    }

    private static ReadOnlyCollection<Record> UserStoryCheckIterationPath228385(string url, List<string> lines, ReadOnlyCollection<string> _, ReadOnlyDictionary<int, Record> keyValuePairs, string workItemType)
    {
        List<Record> results = new();
        long totalStoryPoints;
        List<long> collection = new();
        ReadOnlyDictionary<string, List<Record>> records = GetWorkItemsMatching228385(keyValuePairs, workItemType);
        lines.Add("<table border='1'>");
        lines.Add($"<tr><td>{string.Join("</td><td>", records.Select(l => l.Key))}</td></tr>");
        foreach (KeyValuePair<string, List<Record>> keyValuePair in records)
        {
            totalStoryPoints = 0;
            foreach (Record record in keyValuePair.Value)
            {
                if (record.WorkItem.StoryPoints is null)
                    continue;
                totalStoryPoints += record.WorkItem.StoryPoints.Value;
            }
            collection.Add(totalStoryPoints);
        }
        lines.Add($"<tr><td>{string.Join("</td><td>", collection)}</td></tr>");
        lines.Add("</table>");
        lines.Add(string.Empty);
        foreach (KeyValuePair<string, List<Record>> keyValuePair in records)
        {
            totalStoryPoints = 0;
            foreach (Record record in keyValuePair.Value)
            {
                if (record.WorkItem.StoryPoints is null)
                    continue;
                totalStoryPoints += record.WorkItem.StoryPoints.Value;
            }
            lines.Add(string.Empty);
            lines.Add($"## {keyValuePair.Key} => {totalStoryPoints}");
            lines.Add(string.Empty);
            foreach (Record record in keyValuePair.Value)
                lines.Add($"- [ ] [{record.WorkItem.Id}]({url}{record.WorkItem.Id}) - {record.WorkItem.Title}");
        }
        return new(results);
    }

    private static ReadOnlyDictionary<string, List<Record>> GetWorkItemsMatching228385(ReadOnlyDictionary<int, Record> keyValuePairs, string workItemType)
    {
        ReadOnlyDictionary<string, List<Record>> results;
        Record record;
        List<Record> records = new();
        foreach (KeyValuePair<int, Record> keyValuePair in keyValuePairs)
        {
            record = keyValuePair.Value;
            if (record.WorkItem.State is "Removed" or "Closed")
                continue;
            if (!record.WorkItem.IterationPath.Contains('\\'))
                continue;
            if (record.WorkItem.StoryPoints is null)
                continue;
            if (record.WorkItem.WorkItemType != workItemType)
                continue;
            records.Add(record);
        }
        Record[] sorted = (from l in records orderby l.WorkItem.AreaPath, l.WorkItem.IterationPath, l.WorkItem.AssignedTo select l).ToArray();
        results = GetWorkItemsMatching228385(new(sorted));
        return results;
    }

    private static ReadOnlyDictionary<string, List<Record>> GetWorkItemsMatching228385(ReadOnlyCollection<Record> records)
    {
        Dictionary<string, List<Record>> results = new();
        string key;
        string[] segments;
        List<Record>? collection;
        foreach (Record record in records)
        {
            key = $"{record.WorkItem.AreaPath.Split('\\').Last()}-{record.WorkItem.IterationPath.Split('\\').Last().Split(' ').Last()}";
            if (!results.TryGetValue(key, out collection))
            {
                results.Add(key, new());
                if (!results.TryGetValue(key, out collection))
                    throw new Exception();
            }
            collection.Add(record);
        }
        foreach (Record record in records)
        {
            if (string.IsNullOrEmpty(record.WorkItem.AssignedTo))
                continue;
            segments = record.WorkItem.AssignedTo.Split(' ');
            if (segments.Length < 3)
                continue;
            key = $"{record.WorkItem.IterationPath.Split('\\').Last().Split(' ').Last()}-{segments[0][0]}{segments[1][0]}";
            if (!results.TryGetValue(key, out collection))
            {
                results.Add(key, new());
                if (!results.TryGetValue(key, out collection))
                    throw new Exception();
            }
            collection.Add(record);
        }
        return new(results);
    }

    internal static List<Description> GetDescriptions(JsonElement[] jsonElements)
    {
        List<Description> results = new();
        Description? description;
        JsonSerializerOptions jsonSerializerOptions = new() { NumberHandling = JsonNumberHandling.AllowReadingFromString | JsonNumberHandling.WriteAsString };
        foreach (JsonElement jsonElement in jsonElements)
        {
            if (jsonElement.ValueKind != JsonValueKind.Object)
                throw new Exception();
            description = JsonSerializer.Deserialize<Description>(jsonElement.ToString(), jsonSerializerOptions);
            if (description is null)
                continue;
            results.Add(description);
        }
        return results;
    }

}