@extends('admin.layout.app')

@section('body')
<div class="card card-page p-3 shadow-sm">

    {{-- Header --}}
    <div class="d-flex justify-content-between align-items-start flex-wrap gap-2 mb-3">
        <div>
            <h4 class="mb-1">{{ __('admin.semesters') }}</h4>
            <small class="text-muted">{{ __('admin.manage_semesters_under_programs_number_date_range') }}</small>

            @if($program_id)
                @php
                    $p = $programs->firstWhere('id', (int)$program_id);
                    $d = $p?->department;
                    $f = $d?->faculty;
                    $u = $f?->university;
                @endphp
                <div class="mt-2 d-flex flex-wrap gap-2">
                    <span class="badge bg-info">
                        <i class="fas fa-graduation-cap me-1"></i> {{ __('admin.program') }}: {{ $p->name ?? 'Selected' }}
                    </span>
                    @if($d) <span class="badge bg-light text-dark border"><i class="fas fa-sitemap me-1"></i> {{ $d->name }}</span> @endif
                    @if($f) <span class="badge bg-light text-dark border"><i class="fas fa-layer-group me-1"></i> {{ $f->name }}</span> @endif
                    @if($u) <span class="badge bg-light text-dark border"><i class="fas fa-university me-1"></i> {{ $u->name }}</span> @endif
                </div>
            @endif
        </div>

        <div class="d-flex gap-2">
            <a href="{{ route('semesters.create', ['program_id'=>$program_id]) }}" class="btn btn-primary">
                <i class="fas fa-plus me-2"></i> {{ __('admin.new_semester') }}
            </a>
        </div>
    </div>

    @if(session('msg'))
        <div class="alert alert-info">{{ session('msg') }}</div>
    @endif

    {{-- Filter Bar --}}
    <form method="GET" class="row g-2 align-items-end mb-3">
        <div class="col-md-4">
            <label class="form-label mb-0 small">{{ __('admin.search') }}</label>
            <input name="q" value="{{ $q }}" class="form-control" placeholder="{{ __('admin.search_semester_name') }}">
        </div>

        <div class="col-md-6">
            <label class="form-label mb-0 small">{{ __('admin.program') }}</label>
            <select name="program_id" class="form-select">
                <option value="">{{ __('admin.all_programs') }}</option>
                @foreach($programs as $p)
                    <option value="{{ $p->id }}" @selected((string)$program_id === (string)$p->id)>
                        {{ $p->name }}
                        @if($p->department) — {{ $p->department->name }} @endif
                        @if(optional($p->department)->faculty) — {{ $p->department->faculty->name }} @endif
                        @if(optional(optional($p->department)->faculty)->university) — {{ $p->department->faculty->university->name }} @endif
                    </option>
                @endforeach
            </select>
        </div>

        <div class="col-md-2 d-flex gap-2">
            <button class="btn btn-outline-primary w-100">
                <i class="fas fa-filter me-1"></i> {{ __('admin.filter') }}
            </button>
            <a href="{{ route('semesters.index') }}" class="btn btn-outline-secondary w-100">{{ __('admin.reset') }}</a>
        </div>
    </form>

    {{-- Table --}}
    <div class="table-responsive">
        <table class="table table-hover align-middle">
            <thead class="table-light">
                <tr>
                    <th style="width:80px;">#</th>
                    <th>{{ __('admin.semester') }}</th>
                    <th style="width:120px;">{{ __('admin.number') }}</th>
                    <th style="width:320px;">{{ __('admin.program') }}</th>
                    <th style="width:220px;">{{ __('admin.date_range') }}</th>
                    <th style="width:200px;">{{ __('admin.next_semester') }}</th>  {{-- NEW COLUMN --}}
                    <th style="width:170px;">{{ __('admin.actions') }}</th>
                </tr>
            </thead>
            <tbody>
                @forelse($semesters as $s)
                    <tr>
                        <td>{{ $s->id }}</td>
                        <td class="fw-semibold">
                            {{ $s->name }}
                            <div class="small text-muted">{{ __('admin.semester_id') }}: {{ $s->id }}</div>
                        </td>
                        <td>
                            <span class="badge bg-light text-dark border">
                                {{ $s->number ?? '—' }}
                            </span>
                        </td>
                        <td>
                            <span class="badge bg-info">
                                <i class="fas fa-graduation-cap me-1"></i> {{ $s->program->name ?? '—' }}
                            </span>
                        </td>
                        <td>
                            @php
                                $sd = $s->start_date ? $s->start_date->format('Y-m-d') : null;
                                $ed = $s->end_date ? $s->end_date->format('Y-m-d') : null;
                            @endphp
                            <span class="badge bg-light text-dark border">
                                <i class="far fa-calendar-alt me-1"></i>
                                {{ $sd ?? '—' }} → {{ $ed ?? '—' }}
                            </span>
                        </td>
                         {{-- Next Semester Column --}}
                        <td>
                            @if($s->nextSemester)
                                <a href="{{ route('semesters.edit', $s->nextSemester->id) }}" class="badge bg-primary text-decoration-none">
                                    <i class="fas fa-arrow-right me-1"></i> {{ $s->nextSemester->name }}
                                </a>
                                <div class="small text-muted mt-1">{{ __('admin.id') }}: {{ $s->nextSemester->id }}</div>
                            @else
                                <span class="badge bg-secondary">{{ __('admin.end_of_program') }}</span>
                            @endif
                        </td>
                        <td class="d-flex gap-1">
                            <a class="btn btn-sm btn-outline-info" href="{{ route('semesters.show',$s->id) }}">
                                <i class="far fa-eye"></i>
                            </a>
                            <a class="btn btn-sm btn-outline-primary" href="{{ route('semesters.edit',$s->id) }}">
                                <i class="far fa-edit"></i>
                            </a>
                            <form action="{{ route('semesters.destroy',$s->id) }}" method="POST"
                                  onsubmit="return confirm('{{ __('admin.delete_this_semester') }}');">
                                @csrf
                                @method('DELETE')
                                <button class="btn btn-sm btn-outline-danger">
                                    <i class="far fa-trash-alt"></i>
                                </button>
                            </form>
                        </td>
                    </tr>
                @empty
                    <tr>
                        <td colspan="7" class="text-center p-4">
                            <div class="text-muted">
                                <i class="fas fa-info-circle me-1"></i> {{ __('admin.no_semesters_found') }}
                            </div>
                            <div class="mt-2">
                                <a href="{{ route('semesters.create') }}" class="btn btn-sm btn-primary">
                                    <i class="fas fa-plus me-1"></i> {{ __('admin.add_first_semester') }}
                                </a>
                            </div>
                        </td>
                    </tr>
                @endforelse
            </tbody>
        </table>
    </div>

    <div class="mt-3">{{ $semesters->withQueryString()->links('pagination::bootstrap-4') }}</div>
</div>
@endsection