{{-- filepath: resources/views/project_list/gantt.blade.php --}}
@extends('layouts.app')

@section('page-pretitle', __('Management'))
@section('page-title', __('Project Gantt Chart'))

@section('content')
    {{-- Flash Messages --}}
    @if ($errors->any())
        <div id="validation-alert" class="alert alert-danger alert-dismissible fade show position-fixed top-0 end-0 m-4 bg-red text-white d-flex align-items-center shadow" role="alert" style="z-index: 950; width: 450px;">
            <div class="flex-grow-1">
                <ul class="mb-0">
                    @foreach ($errors->all() as $error)
                        <li>{{ $error }}</li>
                    @endforeach
                </ul>
            </div>
            <button type="button" class="btn-close btn-close-white ms-2" data-bs-dismiss="alert" aria-label="Close"></button>
        </div>
    @endif

    @if (session('success'))
        <div id="success-alert" class="alert alert-success alert-dismissible fade show position-fixed top-0 end-0 m-4 bg-green text-white d-flex align-items-center shadow" role="alert" style="z-index: 950; width: 450px;">
            <div class="flex-grow-1">
                {{ session('success') }}
            </div>
            <button type="button" class="btn-close btn-close-white ms-2" data-bs-dismiss="alert" aria-label="Close"></button>
        </div>
    @endif

    <style>
        @media (max-width: 768px) {
            #validation-alert, #success-alert {
                width: 90% !important;
                left: 5% !important;
            }
        }
        @media (max-width: 576px) {
            #validation-alert, #success-alert {
                width: 95% !important;
                left: 2.5% !important;
            }
        }
    </style>

    <div class="d-flex justify-content-between align-items-center mb-4" style="margin-top: -60px;">
        <h2 class="mb-0"></h2>
        <a href="{{ route('project.tasks', $project->id) }}" class="btn btn-secondary">
            Back
        </a>
    </div>

    <div class="row g-4">
        <div class="col-12 col-lg-8">
            <div class="card shadow-sm rounded-3 border-0 mb-4">
                <div class="card-header d-flex flex-column flex-md-row justify-content-between align-items-start align-items-md-center bg-white border-bottom py-3 px-4">
                    <div>
                        <h4 class="mb-1 text-primary">
                            <i class="ti ti-info-circle"></i> {{ strtoupper($project->ref_no ?? '-')}}
                        </h4>
                        <div class="text-muted small">{{ $project->description }}</div>
                    </div>

                </div>

                <div class="d-flex justify-content-end mb-3 p-2">
                    <button id="toggleFullscreenBtn" class="btn btn-outline-primary btn-sm">
                        <i class="ti ti-maximize"></i> View Full Screen
                    </button>
                </div>


                <div class="card-body p-0">
                    <div id="gantt_here" style="width:100%; min-height:540px; height:60vh;"></div>
                </div>
            </div>
        </div>
        <div class="col-12 col-lg-4">
            {{-- Milestone List --}}
            <div class="card shadow-sm mb-4">
                <div class="card-header bg-light d-flex align-items-center justify-content-between">
                    <h3 class="card-title mb-0"><i class="ti ti-flag"></i> Milestones</h3>
                    @if (auth()->user()->role == 'admin')
                        <button class="btn btn-success" data-bs-toggle="modal" data-bs-target="#milestoneModal">
                            <i class="ti ti-flag"></i> Add Milestone
                        </button>
                    @endif
                </div>
                <div class="card-body">
                    @php
                        $milestones = \App\Models\Milestone::where('project_id', $project->id)->orderBy('milestone_date')->get();
                    @endphp
                    @if($milestones->isEmpty())
                        <div class="text-center text-muted py-4">No milestones yet.</div>
                    @else

                <div class="list-group">
                    @foreach($milestones as $milestone)
                        <div class="list-group-item d-flex justify-content-between align-items-center flex-wrap">
                            <div class="d-flex align-items-center w-100">
                                <span class="text-dark me-2"><i class="ti ti-flag"></i></span>
                                <strong class="me-2">{{ $milestone->title }}</strong>
                                <span class="ms-auto text-muted small">{{ $milestone->milestone_date->format('d M Y') }}</span>
                                @if (auth()->user()->role == 'admin')
                                    <div class="dropdown">
                                    <button class="btn btn-icon btn-light" type="button"
                                        id="dropdownMilestoneButton{{ $milestone->id }}"
                                        data-bs-toggle="dropdown"
                                        aria-expanded="false"
                                        onclick="event.stopPropagation();">
                                        <i class="ti ti-dots-vertical"></i>
                                    </button>
                                        <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="dropdownMilestoneButton{{ $milestone->id }}">
                                            <li>
                                                <button type="button" class="dropdown-item text-warning"
                                                    data-bs-toggle="modal"
                                                    data-bs-target="#editMilestoneModal"
                                                    data-id="{{ $milestone->id }}"
                                                    data-title="{{ $milestone->title }}"
                                                    data-date="{{ $milestone->milestone_date->format('Y-m-d') }}">
                                                    <i class="ti ti-edit me-2"></i> Edit
                                                </button>
                                            </li>
                                            <li>
                                                <form action="{{ route('milestones.destroy', $milestone->id) }}" method="POST" onsubmit="event.stopPropagation();" class="d-inline">
                                                    @csrf
                                                    @method('DELETE')
                                                    <button type="submit" class=" btn-delete-project dropdown-item text-danger">
                                                        <i class="ti ti-trash me-2"></i> Delete
                                                    </button>
                                                </form>
                                            </li>
                                        </ul>
                                    </div>
                                @endif
                            </div>
                        </div>
                    @endforeach
                </div>
               @endif
                </div>
            </div>
        </div>
    </div>

    <!-- Edit Milestone Modal -->
    <div class="modal fade" id="editMilestoneModal" tabindex="-1" aria-labelledby="editMilestoneModalLabel" aria-hidden="true">
      <div class="modal-dialog">
        <form method="POST" id="editMilestoneForm" class="modal-content rounded-3 shadow-sm">
          @csrf
          @method('PUT')
          <div class="modal-header bg-dark text-white">
            <h5 class="modal-title">Edit Milestone</h5>
            <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
          </div>
          <div class="modal-body">
            <div class="mb-3">
              <label for="edit_title" class="form-label">Milestone Title</label>
              <input type="text" name="title" id="edit_title" class="form-control" required>
            </div>
            <div class="mb-3">
              <label for="edit_milestone_date" class="form-label">Date</label>
              <input type="date" name="milestone_date" id="edit_milestone_date" class="form-control" required>
            </div>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
            <button type="submit" class="btn btn-primary">Update</button>
          </div>
        </form>
      </div>
    </div>

    <!-- Add Milestone Modal -->
    <div class="modal fade" id="milestoneModal" tabindex="-1" aria-labelledby="milestoneModalLabel" aria-hidden="true">
      <div class="modal-dialog">
        <form method="POST" action="{{ route('milestones.store') }}" class="modal-content rounded-3 shadow-sm">
          @csrf
          <input type="hidden" name="project_id" value="{{ $project->id }}">
          <div class="modal-header bg-dark text-white">
            <h5 class="modal-title">Add Milestone</h5>
            <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
          </div>
          <div class="modal-body">
            <div class="mb-3">
              <label for="title" class="form-label">Milestone Title</label>
              <input type="text" name="title" class="form-control" required>
            </div>
            <div class="mb-3">
              <label for="milestone_date" class="form-label">Date</label>
              <input type="date" name="milestone_date" class="form-control" required>
            </div>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Cancel</button>
            <button type="submit" class="btn btn-primary">Save</button>
          </div>
        </form>
      </div>
    </div>
@endsection

@section('script')
<script src="https://cdn.dhtmlx.com/gantt/edge/dhtmlxgantt.js"></script>
<link href="https://cdn.dhtmlx.com/gantt/edge/dhtmlxgantt.css" rel="stylesheet">

@php
    $usersArr = $users ?? \App\Models\User::all();
    $usersMap = $usersArr->pluck('name', 'id');
    $tasksMap = $tasks->pluck('name', 'id');
    $ganttTasks = $tasks->map(function($task) use ($usersMap, $tasksMap) {
        return [
            'id' => $task->id,
            'text' => $task->name,
            'start_date' => optional($task->start_date)->format('Y-m-d') ?? now()->format('Y-m-d'),
            'end_date' => optional($task->due_date)->format('Y-m-d') ?? now()->format('Y-m-d'),
            'status' => $task->status->name ?? '-',
            'overdue' => ($task->due_date && $task->due_date < now()),
            'assigned_to' => $usersMap[$task->user_id] ?? '-',
            'priority' => $task->priority ? 'Priority' : 'Not Priority',
            'created_at' => optional($task->created_at)->format('Y-m-d H:i'),
            'parent_task_id' => $task->parent_task_id,
            'remarks' => $task->remarks ?? '-',
        ];
    })->values();

    $ganttLinks = $tasks->filter(fn($task) => $task->parent_task_id)->map(function($task) {
        return [
            'id' => 'link-' . $task->id,
            'source' => $task->parent_task_id,
            'target' => $task->id,
            'type' => 0
        ];
    })->values();

    $milestoneDates = \App\Models\Milestone::where('project_id', $project->id)
        ->pluck('milestone_date')
        ->map(fn($d) => \Carbon\Carbon::parse($d)->format('Y-m-d'))
        ->toArray();

    $milestoneTasks = \App\Models\Milestone::where('project_id', $project->id)
        ->orderBy('milestone_date')
        ->get()
        ->map(function($milestone) {
            return [
                'id' => 'milestone-' . $milestone->id,
                'text' => $milestone->title, // Show milestone title
                'start_date' => optional($milestone->milestone_date)->format('Y-m-d'),
                'end_date' => optional($milestone->milestone_date)->format('Y-m-d'),
                'type' => 'milestone',
                'status' => 'Milestone',
                'color' => '#0dcaf0',
                'readonly' => true,
            ];
        });
@endphp

<script>
document.addEventListener("DOMContentLoaded", () => {
    gantt.config.show_chart = true;
    gantt.config.readonly = true;
    gantt.config.grid_width = 600;
    gantt.config.date_format = "%Y-%m-%d";
    const milestoneDates = @json($milestoneDates);

    var editModal = document.getElementById('editMilestoneModal');
    editModal.addEventListener('show.bs.modal', function (event) {
        var button = event.relatedTarget;
        var id = button.getAttribute('data-id');
        var title = button.getAttribute('data-title');
        var date = button.getAttribute('data-date');
        var form = document.getElementById('editMilestoneForm');
        form.action = '/milestones/' + id;
        document.getElementById('edit_title').value = title;
        document.getElementById('edit_milestone_date').value = date;
    });

    gantt.config.columns = [
        // { name: "text", label: "Task / Milestone", tree: true, width: 250 },
        // { name: "start_date", label: "Start", align: "center", width: 90 },
        // { name: "end_date", label: "End", align: "center", width: 90 },
        // {
        //     name: "status",
        //     label: "Status",
        //     align: "center",
        //     width: 110,
        //     template: obj => {
        //         if(obj.type === 'milestone') {
        //             return `<span class="badge bg-info-lt text-info">Milestone</span>`;
        //         }
        //         const status = (obj.status || '').toLowerCase();
        //         const badge = {
        //             'completed': 'success',
        //             'pending': 'danger',
        //             'in progress': 'info'
        //         }[status] || 'secondary';
        //         return `<span class="badge bg-${badge}-lt text-${badge} text-capitalize">${obj.status ?? '-'}</span>`;
        //     }
        // },
        // {
        //     name: "overdue",
        //     label: "Overdue",
        //     align: "center",
        //     width: 100,
        //     template: obj => obj.overdue
        //         ? '<span class="badge bg-danger-lt text-danger">Overdue</span>'
        //         : '<span class="badge bg-success-lt text-success">On Time</span>'
        // }
    ];

    gantt.templates.task_text = function(start, end, task){
        if (task.type === 'milestone') {
            return `<span style="font-weight:bold;color:#0dcaf0;"><i class="ti ti-flag"></i> ${task.text}</span>`;
        }
        return task.text;
    };

    gantt.templates.task_class = (start, end, task) => {
        let className = '';
        if (task.type === 'milestone') {
            className = 'gantt-task-milestone';
        } else {
            switch ((task.status || '').toLowerCase()) {
                case 'completed': className = 'gantt-task-completed'; break;
                case 'in progress': className = 'gantt-task-inprogress'; break;
                case 'pending': className = 'gantt-task-pending'; break;
            }
            const due = new Date(task.end_date + "T23:59:59");
            const now = new Date();
            if (due < now && task.status !== 'completed') {
                className += ' gantt-task-overdue';
            }
        }
        return className.trim();
    };

    // Combine tasks and milestones
    const ganttData = {
        data: [...@json($ganttTasks), ...@json($milestoneTasks)],
        links: @json($ganttLinks)
    };

    gantt.templates.timeline_cell_class = function(task, date) {
        const formatted = gantt.date.date_to_str("%Y-%m-%d")(date);
        return milestoneDates.includes(formatted) ? "milestone-column" : "";
    };

    gantt.templates.scale_cell_class = function(date) {
        const formatted = gantt.date.date_to_str("%Y-%m-%d")(date);
        return milestoneDates.includes(formatted) ? "milestone-column" : "";
    };

    gantt.templates.task_cell_class = function(item, date) {
        const formatted = gantt.date.date_to_str("%Y-%m-%d")(date);
        return milestoneDates.includes(formatted) ? "milestone-column" : "";
    };

    gantt.init("gantt_here");
    gantt.parse(ganttData);

    ['validation-alert', 'success-alert'].forEach(id => {
        const alert = document.getElementById(id);
        if (alert) {
            setTimeout(() => {
                alert.classList.remove('show');
                alert.classList.add('hide');
                setTimeout(() => alert.remove(), 500);
            }, 3000);
        }
    });

    // Enable Bootstrap popovers
    document.querySelectorAll('[data-bs-toggle="popover"]').forEach(function (el) {
        new bootstrap.Popover(el);
    });


});

document.getElementById('toggleFullscreenBtn').addEventListener('click', function () {
    const ganttContainer = document.getElementById('gantt_here');

    if (!document.fullscreenElement) {
        if (ganttContainer.requestFullscreen) {
            ganttContainer.requestFullscreen();
        } else if (ganttContainer.webkitRequestFullscreen) { // Safari
            ganttContainer.webkitRequestFullscreen();
        } else if (ganttContainer.msRequestFullscreen) { // IE11
            ganttContainer.msRequestFullscreen();
        }
    } else {
        if (document.exitFullscreen) {
            document.exitFullscreen();
        } else if (document.webkitExitFullscreen) { // Safari
            document.webkitExitFullscreen();
        } else if (document.msExitFullscreen) { // IE11
            document.msExitFullscreen();
        }
    }
});
</script>

<style>
#gantt_here:fullscreen {
    width: 100vw;
    height: 100vh;
    background-color: white;
    z-index: 9999;
    /* margin: 30px; */
    padding: 30px;
    padding-left: 15px;
}
.gantt-task-completed .gantt_task_content {
    background-color: #2fb344 !important;
    color: #fff !important;
    font-weight: 500;
    border-radius: 5px;
}
.gantt-task-inprogress .gantt_task_content {
    background-color: #0d6efd !important;
    color: #fff !important;
    font-weight: 500;
    border-radius: 5px;
}
.gantt-task-pending .gantt_task_content {
    background-color: #d63939 !important;
    color: #fff !important;
    font-weight: 500;
    border-radius: 5px;
}
.gantt-task-overdue .gantt_task_content {
    border: 2px dashed #d63939 !important;
}
.gantt_grid .gantt_row:hover {
    background-color: #f0f8ff !important;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}
.gantt_task .gantt_task_row:hover {
    background-color: rgba(13, 110, 253, 0.1) !important;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}
.gantt-task-milestone .gantt_task_content {
    background-color: #0dcaf0 !important;
    border-radius: 50px !important;
    font-weight: bold;
    color: #fff;
}
.milestone-column {
    background-color: #063751 !important;
    color: #fff !important;
}
.gantt_task_bg.milestone-column,
.gantt_row.milestone-column {
    background-color: #063751 !important;
    border-right: 2px solid #063751 !important;
    border-left: 2px solid #063751 !important;
}
@keyframes pulseMilestone {
    0%, 100% { background-color: #063751; }
    50% { background-color: #08506f; }
}
.gantt_task_bg.milestone-column,
.gantt_row.milestone-column {
    animation: pulseMilestone 2s infinite;
}
</style>
@endsection