<?php

namespace App\Http\Controllers\Admin;

use App\Enums\UserRole;
use App\Http\Controllers\Controller;
use App\Models\ActivityLog;
use App\Models\File;
use App\Models\FileCategory;
use App\Models\Player;
use App\Models\Team;
use App\Models\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Illuminate\View\View;

class TeamController extends Controller
{
    public function index(): View
    {
        $teams = Team::withCount(['players', 'events'])->latest()->paginate(20);

        return view('admin.teams.index', compact('teams'));
    }

    public function create(): View
    {
        return view('admin.teams.create');
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'year_group' => ['nullable', 'string', 'max:20'],
            'is_active' => ['boolean'],
        ]);

        $validated['is_active'] = $request->boolean('is_active', true);

        Team::create($validated);

        return redirect()->route('admin.teams.index')
            ->with('success', __('admin.team_created'));
    }

    public function edit(Team $team): View
    {
        $team->load([
            'coaches',
            'players' => fn ($q) => $q->orderBy('last_name'),
            'files.category',
        ]);

        $allCoaches = User::where('role', UserRole::Coach)
            ->where('is_active', true)
            ->orderBy('name')
            ->get();

        $parentReps = $team->parentReps();

        $allTeams = Team::active()->orderBy('name')->get();

        $fileCategories = FileCategory::active()->ordered()
            ->with(['files' => fn ($q) => $q->latest()])
            ->get();

        return view('admin.teams.edit', compact(
            'team', 'allCoaches', 'parentReps', 'allTeams', 'fileCategories'
        ));
    }

    public function update(Request $request, Team $team): RedirectResponse
    {
        $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'year_group' => ['nullable', 'string', 'max:20'],
            'is_active' => ['boolean'],
            'notes' => ['nullable', 'string', 'max:5000'],
            'coach_ids' => ['nullable', 'array'],
            'coach_ids.*' => ['integer', 'exists:users,id', function ($attr, $value, $fail) {
                $user = User::find($value);
                if (!$user || $user->role !== \App\Enums\UserRole::Coach) {
                    $fail(__('validation.exists', ['attribute' => $attr]));
                }
            }],
            'existing_files' => ['nullable', 'array'],
            'existing_files.*' => ['integer', 'exists:files,id'],
            'new_files' => ['nullable', 'array'],
            'new_files.*' => ['file', 'max:10240', 'mimes:pdf,docx,xlsx,jpg,jpeg,png,gif,webp'],
            'new_file_categories' => ['nullable', 'array'],
            'new_file_categories.*' => ['integer', 'exists:file_categories,id'],
        ]);

        $oldData = [
            'name' => $team->name,
            'year_group' => $team->year_group,
            'is_active' => $team->is_active,
            'notes' => $team->notes,
        ];

        $team->update([
            'name' => $request->input('name'),
            'year_group' => $request->input('year_group'),
            'is_active' => $request->boolean('is_active', true),
            'notes' => $request->input('notes'),
        ]);

        // Trainer-Zuordnung sync
        $coachIds = $request->input('coach_ids', []);
        $team->coaches()->sync(array_map('intval', $coachIds));

        // Dateien sync
        $this->syncTeamFiles($team, $request);

        $newData = [
            'name' => $team->name,
            'year_group' => $team->year_group,
            'is_active' => $team->is_active,
            'notes' => $team->notes,
        ];
        ActivityLog::logWithChanges('updated', __('admin.log_team_updated', ['name' => $team->name]), 'Team', $team->id, $oldData, $newData);

        return redirect()->route('admin.teams.edit', $team)
            ->with('success', __('admin.team_updated'));
    }

    public function updatePlayerTeam(Request $request, Team $team): JsonResponse
    {
        $validated = $request->validate([
            'player_id' => ['required', 'integer', 'exists:players,id'],
            'new_team_id' => ['required', 'integer', 'exists:teams,id'],
        ]);

        $player = Player::findOrFail($validated['player_id']);

        // Spieler muss aktuell im Route-Team sein
        if ($player->team_id !== $team->id) {
            return response()->json(['error' => 'Forbidden'], 403);
        }

        // Ziel-Team muss existieren und aktiv sein
        $newTeam = Team::where('id', $validated['new_team_id'])->where('is_active', true)->first();
        if (!$newTeam) {
            return response()->json(['error' => 'Ziel-Team nicht gefunden oder inaktiv'], 422);
        }

        $oldTeamId = $player->team_id;
        $player->update(['team_id' => $newTeam->id]);

        ActivityLog::logWithChanges(
            'updated',
            __('admin.log_player_team_changed', ['name' => $player->full_name]),
            'Player',
            $player->id,
            ['team_id' => $oldTeamId],
            ['team_id' => (int) $validated['new_team_id']]
        );

        return response()->json(['success' => true]);
    }

    private function syncTeamFiles(Team $team, Request $request): void
    {
        $existingFileIds = $request->input('existing_files', []);

        $newFileIds = [];
        $newFiles = $request->file('new_files', []);
        $newCategories = $request->input('new_file_categories', []);

        foreach ($newFiles as $index => $uploadedFile) {
            if (!$uploadedFile || !$uploadedFile->isValid()) {
                continue;
            }

            $categoryId = $newCategories[$index] ?? null;
            if (!$categoryId) {
                continue;
            }

            $extension = $uploadedFile->guessExtension();
            $storedName = Str::uuid() . '.' . $extension;

            Storage::disk('local')->putFileAs('files', $uploadedFile, $storedName);

            $file = new File([
                'file_category_id' => $categoryId,
                'original_name' => $uploadedFile->getClientOriginalName(),
                'mime_type' => $uploadedFile->getClientMimeType(),
                'size' => $uploadedFile->getSize(),
            ]);
            $file->stored_name = $storedName;
            $file->disk = 'private';
            $file->uploaded_by = auth()->id();
            $file->save();

            $newFileIds[] = $file->id;
        }

        $allFileIds = array_merge(
            array_map('intval', $existingFileIds),
            $newFileIds
        );
        $team->files()->sync($allFileIds);
    }
}