<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Department;
use App\Models\TranscriptionProject;
use App\Models\User;
use Illuminate\Support\Facades\DB;
use Illuminate\View\View;

class DashboardController extends Controller
{
    public function index(): View
    {
        $stats = [
            'users_active'            => User::where('is_active', true)->where('role', 'user')->count(),
            'users_inactive'          => User::where('is_active', false)->where('role', 'user')->count(),
            'users_total'             => User::where('role', 'user')->count(),
            'projects_total'          => TranscriptionProject::count(),
            'projects_pending'        => TranscriptionProject::where('transcription_status', 'pending')->count(),
            'projects_processing'     => TranscriptionProject::where('transcription_status', 'processing')->count(),
            'projects_completed'      => TranscriptionProject::where('transcription_status', 'completed')->count(),
            'projects_failed'         => TranscriptionProject::where('transcription_status', 'failed')->count(),
            'projects_deleted'        => TranscriptionProject::onlyTrashed()->count(),
            'projects_last_7'         => TranscriptionProject::where('created_at', '>=', now()->subDays(7))->count(),
            'projects_last_30'        => TranscriptionProject::where('created_at', '>=', now()->subDays(30))->count(),
            'storage_bytes'           => (int) TranscriptionProject::sum('file_size'),
            'storage_completed_bytes' => (int) TranscriptionProject::where('transcription_status', 'completed')->sum('file_size'),
            'duration_total_seconds'  => (int) TranscriptionProject::whereNotNull('duration_seconds')->sum('duration_seconds'),
        ];

        // Top 5 pengguna paling aktif (by project count)
        $topUsers = User::where('role', 'user')
            ->withCount('ownedProjects')
            ->orderByDesc('owned_projects_count')
            ->limit(5)
            ->get(['id', 'name', 'email']);

        // Trend projek 30 hari lepas (group by date)
        $trendRaw = TranscriptionProject::select(
                DB::raw('DATE(created_at) as date'),
                DB::raw('COUNT(*) as total'),
                DB::raw('SUM(CASE WHEN transcription_status = "completed" THEN 1 ELSE 0 END) as completed'),
                DB::raw('SUM(CASE WHEN transcription_status = "failed" THEN 1 ELSE 0 END) as failed')
            )
            ->where('created_at', '>=', now()->subDays(29)->startOfDay())
            ->groupBy(DB::raw('DATE(created_at)'))
            ->orderBy('date')
            ->get();

        // Projek mengikut jabatan (metadata sahaja)
        $deptStats = Department::select('departments.name')
            ->selectRaw('COUNT(tp.id) as project_count')
            ->leftJoin('users', 'users.department_id', '=', 'departments.id')
            ->leftJoin('transcription_projects as tp', 'tp.owner_user_id', '=', 'users.id')
            ->where('departments.is_active', true)
            ->groupBy('departments.id', 'departments.name')
            ->orderByDesc('project_count')
            ->limit(8)
            ->get();

        return view('admin.dashboard', compact('stats', 'topUsers', 'trendRaw', 'deptStats'));
    }
}