using System.Text.Json;
using Jiaowu.Api.Domain.Academic;
using Jiaowu.Api.Infrastructure.Caching;
using Jiaowu.Api.Infrastructure.Persistence;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;

namespace Jiaowu.Api.Controllers;

[ApiController]
[Authorize]
[Route("api/dashboard")]
public sealed class DashboardController(
    AppDbContext db,
    IAppCache appCache,
    IOptions<JsonOptions> jsonOptions) : ControllerBase
{
    [HttpGet]
    public async Task<ActionResult<object>> Get(CancellationToken cancellationToken)
    {
        var response = await appCache.GetOrCreateAsync(
            AppCacheKeys.Dashboard,
            LoadAsync,
            AppCacheProfile.Analytics,
            [AppCacheTags.Analytics],
            cancellationToken);
        return response;
    }

    private async Task<JsonElement> LoadAsync(CancellationToken cancellationToken)
    {
        var currentTerm = await db.AcademicTerms
            .AsNoTracking()
            .Where(x => x.IsCurrent)
            .Select(x => new { x.Id, x.Name, x.StartDate, x.EndDate })
            .FirstOrDefaultAsync(cancellationToken);

        return JsonSerializer.SerializeToElement(
            new
            {
                CurrentTerm = currentTerm,
                Counts = new
                {
                    Campuses = await db.Campuses.CountAsync(cancellationToken),
                    Colleges = await db.Colleges.CountAsync(cancellationToken),
                    Majors = await db.Majors.CountAsync(cancellationToken),
                    Classes = await db.AdministrativeClasses.CountAsync(cancellationToken),
                    Classrooms = await db.Classrooms.CountAsync(cancellationToken),
                    Teachers = await db.Teachers.CountAsync(cancellationToken),
                    Students = await db.Students.CountAsync(cancellationToken),
                    Courses = await db.Courses.CountAsync(cancellationToken),
                    CurriculumPlans = await db.CurriculumPlans.CountAsync(cancellationToken),
                    TeachingTasks = await db.TeachingTasks.CountAsync(cancellationToken),
                    SchedulePlans = await db.SchedulePlans.CountAsync(cancellationToken),
                    CourseSelectionRounds = await db.CourseSelectionRounds
                        .CountAsync(cancellationToken),
                    CourseSelectionOfferings = await db.CourseSelectionOfferings
                        .CountAsync(cancellationToken),
                    CourseEnrollments = await db.CourseEnrollments
                        .CountAsync(
                            x => x.Status == CourseEnrollmentStatus.Enrolled,
                            cancellationToken),
                    GradeSheets = await db.GradeSheets.CountAsync(cancellationToken),
                    PublishedGradeSheets = await db.GradeSheets.CountAsync(
                        x => x.Status == GradeSheetStatus.Published,
                        cancellationToken),
                    GradeRecords = await db.GradeRecords.CountAsync(cancellationToken),
                    ExamPlans = await db.ExamPlans.CountAsync(cancellationToken),
                    ExamSessions = await db.ExamSessions.CountAsync(cancellationToken),
                    StudentStatusChanges = await db.StudentStatusChanges
                        .CountAsync(cancellationToken),
                    PendingStudentStatusChanges = await db.StudentStatusChanges.CountAsync(
                        x => x.State == StudentStatusChangeState.Submitted ||
                             x.State == StudentStatusChangeState.CounselorApproved ||
                             x.State == StudentStatusChangeState.CollegeApproved,
                        cancellationToken),
                    GraduationAuditBatches = await db.GraduationAuditBatches
                        .CountAsync(cancellationToken),
                    PublishedGraduationAuditBatches = await db.GraduationAuditBatches
                        .CountAsync(
                            x => x.Status == GraduationAuditBatchStatus.Published,
                            cancellationToken),
                    DegreeAwardBatches = await db.DegreeAwardBatches
                        .CountAsync(cancellationToken),
                    PublishedDegreeAwardBatches = await db.DegreeAwardBatches
                        .CountAsync(
                            x => x.Status == DegreeAwardBatchStatus.Published,
                            cancellationToken),
                    GraduationClearanceBatches = await db.GraduationClearanceBatches
                        .CountAsync(cancellationToken),
                    OpenGraduationClearanceBatches = await db.GraduationClearanceBatches
                        .CountAsync(
                            x => x.Status == GraduationClearanceBatchStatus.Open,
                            cancellationToken),
                    Users = await db.Users.CountAsync(cancellationToken)
                }
            },
            jsonOptions.Value.JsonSerializerOptions);
    }
}