using System.Security.AccessControl;
using GozareshgirProgramManager.Application._Common.Interfaces;
using GozareshgirProgramManager.Application._Common.Models;
using Microsoft.EntityFrameworkCore;

namespace GozareshgirProgramManager.Application.Modules.Projects.Queries.ProjectDeployBoardDetail;

public record ProjectDeployBoardDetailsResponse(
    ProjectDeployBoardDetailPhaseItem Phase,
    List<ProjectDeployBoardDetailTaskItem> Tasks);

public record ProjectDeployBoardDetailPhaseItem(
    string Name,
    TimeSpan TotalTimeSpan,
    TimeSpan DoneTimeSpan,
    int Percentage);

public record ProjectDeployBoardDetailTaskItem(
    string Name,
    TimeSpan TotalTimeSpan,
    TimeSpan DoneTimeSpan,
    int Percentage,
    List<ProjectDeployBoardDetailItemSkill> Skills)
    : ProjectDeployBoardDetailPhaseItem(Name, TotalTimeSpan, DoneTimeSpan,Percentage);

public record ProjectDeployBoardDetailItemSkill(string OriginalUserFullName, string SkillName, int TimePercentage);

public record ProjectDeployBoardDetailsQuery(Guid PhaseId) : IBaseQuery<ProjectDeployBoardDetailsResponse>;

public class
    ProjectDeployBoardDetailsQueryHandler : IBaseQueryHandler<ProjectDeployBoardDetailsQuery,
    ProjectDeployBoardDetailsResponse>
{
    private readonly IProgramManagerDbContext _dbContext;

    public ProjectDeployBoardDetailsQueryHandler(IProgramManagerDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public async Task<OperationResult<ProjectDeployBoardDetailsResponse>> Handle(ProjectDeployBoardDetailsQuery request,
        CancellationToken cancellationToken)
    {
        var phase = await _dbContext.ProjectPhases
            .Include(x => x.Tasks)
            .ThenInclude(x => x.Sections)
            .ThenInclude(x => x.Activities)
            .Include(x => x.Tasks)
            .ThenInclude(x => x.Sections)
            .ThenInclude(x => x.AdditionalTimes)
            .Include(x => x.Tasks)
            .ThenInclude(x => x.Sections)
            .ThenInclude(x => x.Skill)
            .FirstOrDefaultAsync(x => x.Id == request.PhaseId, cancellationToken);

        if (phase == null)
            return OperationResult<ProjectDeployBoardDetailsResponse>.NotFound("بخش اصلی مورد نظر یافت نشد");

        var userIds = phase.Tasks
            .SelectMany(t => t.Sections)
            .Select(s => s.OriginalAssignedUserId)
            .Distinct()
            .ToList();

        var usersDict = await _dbContext.Users
            .Where(x => userIds.Contains(x.Id))
            .ToDictionaryAsync(x => x.Id, x => x.FullName, cancellationToken);

        var tasksRes = phase.Tasks.Select(t =>
        {
            var totalTime = t.Sections.Select(s => s.FinalEstimatedHours)
                .Aggregate(TimeSpan.Zero, (sum, next) => sum.Add(next));

            var doneTime = t.Sections.Aggregate(TimeSpan.Zero,
                (sum, next) => sum.Add(next.GetTotalTimeSpent()));
            var skills = t.Sections
                .Select(s =>
                {
                    var originalUserFullName = usersDict.GetValueOrDefault(s.OriginalAssignedUserId,
                        "کاربر ناشناس");

                    var skillName = s.Skill?.Name ?? "بدون مهارت";

                    var timePercentage = (int)s.GetProgressPercentage();
                    
                    return new ProjectDeployBoardDetailItemSkill(
                        originalUserFullName,
                        skillName,
                        timePercentage);
                }).ToList();
            var taskPercentage = (int)Math.Round(skills.Average(x => x.TimePercentage));

            return new ProjectDeployBoardDetailTaskItem(
                t.Name,
                totalTime,
                doneTime,
                taskPercentage,
                skills);
        }).ToList();

        var totalTimeSpan = tasksRes.Aggregate(TimeSpan.Zero,
            (sum, next) => sum.Add(next.TotalTimeSpan));

        var doneTimeSpan = tasksRes.Aggregate(TimeSpan.Zero,
            (sum, next) => sum.Add(next.DoneTimeSpan));

        var phasePercentage = tasksRes.Average(x => x.Percentage);
            
        var phaseRes = new ProjectDeployBoardDetailPhaseItem(phase.Name, totalTimeSpan, doneTimeSpan,
            (int)phasePercentage);

        var res = new ProjectDeployBoardDetailsResponse(phaseRes, tasksRes);

        return OperationResult<ProjectDeployBoardDetailsResponse>.Success(res);
    }
}