@model EventRegistrationCreateDto
@{
    ViewData["Title"] = "Register Student";
    var students = ViewBag.Students as IEnumerable<StudentDto>;
    var telId = ViewBag.TournamentEventLevelId as int?;
    var eventName = ViewBag.EventName as string;
    var levelName = ViewBag.LevelName as string;
    var isEligible = ViewBag.IsEligible as bool?;
    var eligibilityReason = ViewBag.EligibilityReason as string;
    var selectedStudentId = Model?.StudentId;
}

<h2>Register Student</h2>
@if (!string.IsNullOrEmpty(eventName))
{
    <p class="text-muted">@eventName - @levelName</p>
}
<hr />

<div class="row">
    <div class="col-md-6">
        <form asp-action="Register" method="post">
            <div asp-validation-summary="All" class="text-danger"></div>
            <input type="hidden" name="TournamentEventLevelId" value="@telId" />
            <div class="mb-3">
                <label class="form-label">Student</label>
                @* Re-request the page with the chosen student so eligibility is checked before submitting. *@
                <select name="StudentId" class="form-select"
                        onchange="window.location = '@Url.Action("Register", new { tournamentEventLevelId = telId })&studentId=' + this.value">
                    <option value="">Select Student</option>
                    @if (students != null)
                    {
                        @foreach (var s in students)
                        {
                            <option value="@s.StudentId" selected="@(selectedStudentId == s.StudentId)">@s.FullName (@s.SchoolName) - @s.Sex</option>
                        }
                    }
                </select>
            </div>
            @if (isEligible == true)
            {
                <div class="alert alert-success py-2">
                    <i class="bi bi-check-circle"></i> This student is eligible for this event level.
                </div>
            }
            else if (isEligible == false)
            {
                <div class="alert alert-danger py-2">
                    <i class="bi bi-x-circle"></i> Not eligible: @eligibilityReason
                </div>
            }
            <button type="submit" class="btn btn-primary" disabled="@(isEligible == false)">Register</button>
            <a asp-action="Index" asp-route-tournamentEventLevelId="@telId" class="btn btn-secondary">Cancel</a>
        </form>
    </div>
</div>