using DNTPersianUtils.Core;
using GozareshgirProgramManager.Application._Common.Interfaces;
using GozareshgirProgramManager.Application._Common.Models;
using GozareshgirProgramManager.Application.Modules.Projects.Commands.SetTimeProject;
using GozareshgirProgramManager.Application.Modules.Projects.DTOs;
using GozareshgirProgramManager.Domain._Common;
using GozareshgirProgramManager.Domain.ProjectAgg.Enums;
using Microsoft.EntityFrameworkCore;

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


public class ProjectSetTimeDetailsQueryHandler
    : IBaseQueryHandler<ProjectSetTimeDetailsQuery, ProjectSetTimeResponse>
{
    private readonly IProgramManagerDbContext _context;

    public ProjectSetTimeDetailsQueryHandler(IProgramManagerDbContext context)
    {
        _context = context;
    }

    public async Task<OperationResult<ProjectSetTimeResponse>> Handle(ProjectSetTimeDetailsQuery request,
        CancellationToken cancellationToken)
    {
        return request.Level switch
        {
            ProjectHierarchyLevel.Task => await GetTaskSetTimeDetails(request.Id, request.Level, cancellationToken),
            ProjectHierarchyLevel.Phase => await GetPhaseSetTimeDetails(request.Id, request.Level, cancellationToken),
            ProjectHierarchyLevel.Project => await GetProjectSetTimeDetails(request.Id, request.Level, cancellationToken),
            _ => OperationResult<ProjectSetTimeResponse>.Failure("سطح معادل نامعتبر است")
        };
    }

    private async Task<OperationResult<ProjectSetTimeResponse>> GetTaskSetTimeDetails(Guid id, ProjectHierarchyLevel level,
        CancellationToken cancellationToken)
    {
        var task = await _context.ProjectTasks
            .Where(p => p.Id == id)
            .Include(x => x.Sections)
            .ThenInclude(x => x.AdditionalTimes).AsNoTracking()
            .FirstOrDefaultAsync(cancellationToken);
        
        if (task == null)
        {
            return OperationResult<ProjectSetTimeResponse>.NotFound("تسک یافت نشد");
        }
        
        var userIds = task.Sections.Select(x => x.OriginalAssignedUserId)
            .Distinct().ToList();
        
        var users = await _context.Users
            .Where(x => userIds.Contains(x.Id))
            .AsNoTracking()
            .ToListAsync(cancellationToken);
        
        var skills = await _context.Skills
            .AsNoTracking()
            .ToListAsync(cancellationToken);

        var res = new ProjectSetTimeResponse(
            skills.Select(skill =>
            {
                var section = task.Sections
                    .FirstOrDefault(x => x.SkillId == skill.Id);
                var user = users.FirstOrDefault(x => x.Id == section?.OriginalAssignedUserId);
                return new ProjectSetTimeResponseSkill
                {
                    AdditionalTimes = section?.AdditionalTimes
                        .Select(x => new ProjectSetTimeResponseSectionAdditionalTime
                        {
                            Description = x.Reason ?? "",
                            Hours = (int)x.Hours.TotalHours,
                            Minutes = x.Hours.Minutes,
                            CreationDate = x.CreationDate.ToFarsi()
                        }).OrderBy(x => x.CreationDate).ToList() ?? [],
                    InitCreationTime = section?.CreationDate.ToFarsi() ?? "",
                    SkillName = skill.Name ?? "",
                    UserFullName = user?.FullName ?? "",
                    SectionId = section?.Id ?? Guid.Empty,
                    InitialDescription = section?.InitialDescription ?? "",
                    InitialHours = (int)(section?.InitialEstimatedHours.TotalHours ?? 0),
                    InitialMinutes = section?.InitialEstimatedHours.Minutes ?? 0,
                    UserId = section?.OriginalAssignedUserId ?? 0,
                    SkillId = skill.Id,
                };
            }).OrderBy(x => x.SkillId).ToList(),
            task.Id,
            level);

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

    private async Task<OperationResult<ProjectSetTimeResponse>> GetPhaseSetTimeDetails(Guid id, ProjectHierarchyLevel level,
        CancellationToken cancellationToken)
    {
        var phase = await _context.ProjectPhases
            .Where(p => p.Id == id)
            .Include(x => x.PhaseSections).AsNoTracking()
            .FirstOrDefaultAsync(cancellationToken);

        if (phase == null)
        {
            return OperationResult<ProjectSetTimeResponse>.NotFound("فاز یافت نشد");
        }

        var userIds = phase.PhaseSections.Select(x => x.UserId)
            .Distinct().ToList();

        var users = await _context.Users
            .Where(x => userIds.Contains(x.Id))
            .AsNoTracking()
            .ToListAsync(cancellationToken);

        var skills = await _context.Skills
            .AsNoTracking()
            .ToListAsync(cancellationToken);

        var res = new ProjectSetTimeResponse(
            skills.Select(skill =>
            {
                var section = phase.PhaseSections
                    .FirstOrDefault(x => x.SkillId == skill.Id);
                var user = users.FirstOrDefault(x => x.Id == section?.UserId);
                return new ProjectSetTimeResponseSkill
                {
                    AdditionalTimes = [],
                    InitCreationTime = "",
                    SkillName = skill.Name ?? "",
                    UserFullName = user?.FullName ?? "",
                    SectionId = section?.Id ?? Guid.Empty,
                    InitialDescription = "",
                    InitialHours = 0,
                    InitialMinutes = 0,
                    UserId = section?.UserId ?? 0,
                    SkillId = skill.Id,
                };
            }).OrderBy(x => x.SkillId).ToList(),
            phase.Id,
            level);

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

    private async Task<OperationResult<ProjectSetTimeResponse>> GetProjectSetTimeDetails(Guid id, ProjectHierarchyLevel level,
        CancellationToken cancellationToken)
    {
        var project = await _context.Projects
            .Where(p => p.Id == id)
            .Include(x => x.ProjectSections).AsNoTracking()
            .FirstOrDefaultAsync(cancellationToken);

        if (project == null)
        {
            return OperationResult<ProjectSetTimeResponse>.NotFound("پروژه یافت نشد");
        }

        var userIds = project.ProjectSections.Select(x => x.UserId)
            .Distinct().ToList();

        var users = await _context.Users
            .Where(x => userIds.Contains(x.Id))
            .AsNoTracking()
            .ToListAsync(cancellationToken);

        var skills = await _context.Skills
            .AsNoTracking()
            .ToListAsync(cancellationToken);

        var res = new ProjectSetTimeResponse(
            skills.Select(skill =>
            {
                var section = project.ProjectSections
                    .FirstOrDefault(x => x.SkillId == skill.Id);
                var user = users.FirstOrDefault(x => x.Id == section?.UserId);
                return new ProjectSetTimeResponseSkill
                {
                    AdditionalTimes = [],
                    InitCreationTime = "",
                    SkillName = skill.Name ?? "",
                    UserFullName = user?.FullName ?? "",
                    SectionId = section?.Id ?? Guid.Empty,
                    InitialDescription = "",
                    InitialHours = 0,
                    InitialMinutes = 0,
                    UserId = section?.UserId ?? 0,
                    SkillId = skill.Id,
                };
            }).OrderBy(x => x.SkillId).ToList(),
            project.Id,
            level);

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