<?php

namespace App\Http\Controllers;

use App\Models\Project;
use App\Models\ProjectModule;
use App\Models\ProjectTask;
use App\Models\ProjectUpdate;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class ProjectController extends Controller
{
    /**
     * Display the public/client project tracking portal & manager view.
     */
    public function show(Request $request, string $slug)
    {
        $project = Project::where('slug', $slug)
            ->with(['modules', 'tasks', 'updates' => function($q) {
                $q->latest();
            }, 'proposal'])
            ->firstOrFail();

        // Recalculate progress dynamically
        $project->recalculateProgress();

        // Strict Admin Check: ONLY logged-in admin users can edit/manage
        $isAdminMode = Auth::check();

        // Client PIN Verification Check: Admins are auto-verified, clients need PIN verification in session
        $isVerified = $isAdminMode || session()->get('project_access_' . $project->id, false);

        return view('projects.show', compact('project', 'isAdminMode', 'isVerified'));
    }

    /**
     * Verify client access code (PIN).
     */
    public function verify(Request $request, string $slug)
    {
        $project = Project::where('slug', $slug)->firstOrFail();

        $request->validate([
            'access_code' => 'required|string',
        ]);

        if (strtoupper(trim($request->input('access_code'))) === strtoupper($project->client_access_code)) {
            session()->put('project_access_' . $project->id, true);
            return back()->with('success', 'Erişim doğrulandı.');
        }

        return back()->withErrors(['access_code' => 'Geçersiz müşteri takip şifresi.']);
    }

    /**
     * Web Manager Action: Update Module Status (Bekliyor / Devam Ediyor / Tamamlandı)
     */
    public function updateModuleStatus(Request $request, string $slug)
    {
        if (!Auth::check()) {
            if ($request->wantsJson() || $request->ajax()) {
                return response()->json(['success' => false, 'message' => 'Bu işlem için yönetici girişi yapmanız gerekmektedir.'], 403);
            }
            return back()->withErrors(['error' => 'Yetkisiz erişim.']);
        }

        $project = Project::where('slug', $slug)->firstOrFail();

        $request->validate([
            'module_id' => 'required|exists:project_modules,id',
            'status' => 'required|in:pending,in_progress,completed',
        ]);

        $module = ProjectModule::where('id', $request->input('module_id'))
            ->where('project_id', $project->id)
            ->firstOrFail();

        $module->update(['status' => $request->input('status')]);
        $newProgress = $project->recalculateProgress();

        if ($request->wantsJson() || $request->ajax()) {
            return response()->json([
                'success' => true,
                'message' => "'{$module->title}' modül durumu güncellendi.",
                'progress_percent' => $newProgress,
            ]);
        }

        return back()->with('success', "'{$module->title}' modül durumu güncellendi.");
    }

    /**
     * Web Manager Action: Update Task Status (Kanban Move)
     */
    public function updateTaskStatus(Request $request, string $slug)
    {
        if (!Auth::check()) {
            if ($request->wantsJson() || $request->ajax()) {
                return response()->json(['success' => false, 'message' => 'Bu işlem için yönetici girişi yapmanız gerekmektedir.'], 403);
            }
            return back()->withErrors(['error' => 'Yetkisiz erişim.']);
        }

        $project = Project::where('slug', $slug)->firstOrFail();

        $request->validate([
            'task_id' => 'required|exists:project_tasks,id',
            'status' => 'required|in:todo,in_progress,review,done',
        ]);

        $task = ProjectTask::where('id', $request->input('task_id'))
            ->where('project_id', $project->id)
            ->firstOrFail();

        $task->update(['status' => $request->input('status')]);
        $newProgress = $project->recalculateProgress();

        if ($request->wantsJson() || $request->ajax()) {
            return response()->json([
                'success' => true,
                'message' => "'{$task->title}' görev durumu güncellendi.",
                'progress_percent' => $newProgress,
                'counts' => [
                    'todo' => $project->tasks()->where('status', 'todo')->count(),
                    'in_progress' => $project->tasks()->where('status', 'in_progress')->count(),
                    'review' => $project->tasks()->where('status', 'review')->count(),
                    'done' => $project->tasks()->where('status', 'done')->count(),
                ]
            ]);
        }

        return back()->with('success', "'{$task->title}' görev durumu güncellendi.");
    }

    /**
     * Web Manager Action: Add New Task
     */
    public function addTask(Request $request, string $slug)
    {
        if (!Auth::check()) {
            return back()->withErrors(['error' => 'Yetkisiz erişim.']);
        }

        $project = Project::where('slug', $slug)->firstOrFail();

        $request->validate([
            'title' => 'required|string|max:255',
            'description' => 'nullable|string|max:2000',
            'status' => 'required|in:todo,in_progress,review,done',
            'priority' => 'required|in:low,medium,high,urgent',
            'assigned_person' => 'nullable|string|max:255',
            'project_module_id' => 'nullable|exists:project_modules,id',
        ]);

        $task = ProjectTask::create([
            'project_id' => $project->id,
            'project_module_id' => $request->input('project_module_id'),
            'title' => $request->input('title'),
            'description' => $request->input('description'),
            'status' => $request->input('status'),
            'priority' => $request->input('priority'),
            'assigned_person' => $request->input('assigned_person'),
        ]);

        $project->recalculateProgress();

        return back()->with('success', "'{$task->title}' görevi panoya eklendi.");
    }

    /**
     * Web Manager Action: Delete Task
     */
    public function deleteTask(Request $request, string $slug)
    {
        if (!Auth::check()) {
            if ($request->wantsJson() || $request->ajax()) {
                return response()->json(['success' => false, 'message' => 'Yetkisiz erişim.'], 403);
            }
            return back()->withErrors(['error' => 'Yetkisiz erişim.']);
        }

        $project = Project::where('slug', $slug)->firstOrFail();

        $request->validate([
            'task_id' => 'required|exists:project_tasks,id',
        ]);

        $task = ProjectTask::where('id', $request->input('task_id'))
            ->where('project_id', $project->id)
            ->firstOrFail();

        $taskName = $task->title;
        $task->delete();
        $project->recalculateProgress();

        return back()->with('success', "'{$taskName}' görevi silindi.");
    }

    /**
     * Web Manager Action: Add Live Progress Update / Announcement
     */
    public function addUpdate(Request $request, string $slug)
    {
        if (!Auth::check()) {
            return back()->withErrors(['error' => 'Yetkisiz erişim.']);
        }

        $project = Project::where('slug', $slug)->firstOrFail();

        $request->validate([
            'title' => 'required|string|max:255',
            'content' => 'required|string|max:5000',
        ]);

        ProjectUpdate::create([
            'project_id' => $project->id,
            'user_id' => Auth::id(),
            'title' => $request->input('title'),
            'content' => $request->input('content'),
            'progress_percent_at_update' => $project->progress_percent,
            'is_public' => true,
        ]);

        return back()->with('success', 'Yeni ilerleme duyurusu yayınlandı.');
    }

    /**
     * Web Manager Action: Delete Live Progress Update / Announcement
     */
    public function deleteUpdate(Request $request, string $slug)
    {
        if (!Auth::check()) {
            if ($request->wantsJson() || $request->ajax()) {
                return response()->json(['success' => false, 'message' => 'Yetkisiz erişim.'], 403);
            }
            return back()->withErrors(['error' => 'Yetkisiz erişim.']);
        }

        $project = Project::where('slug', $slug)->firstOrFail();

        $request->validate([
            'update_id' => 'required|exists:project_updates,id',
        ]);

        $update = ProjectUpdate::where('id', $request->input('update_id'))
            ->where('project_id', $project->id)
            ->firstOrFail();

        $update->delete();

        if ($request->wantsJson() || $request->ajax()) {
            return response()->json([
                'success' => true,
                'message' => 'Duyuru başarıyla silindi.',
            ]);
        }

        return back()->with('success', 'Duyuru başarıyla silindi.');
    }

    /**
     * Web Manager Action: Recalculate Progress %
     */
    public function recalculate(Request $request, string $slug)
    {
        if (!Auth::check()) {
            return back()->withErrors(['error' => 'Yetkisiz erişim.']);
        }

        $project = Project::where('slug', $slug)->firstOrFail();
        $pct = $project->recalculateProgress();

        return back()->with('success', "Proje ilerleme yüzdesi yeniden hesaplandı: %{$pct}");
    }
}