<?php

namespace App\Http\Controllers\Admin;

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 Barryvdh\DomPDF\Facade\Pdf;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Illuminate\View\View;

class ListGeneratorController extends Controller
{
    public function create(): View
    {
        $teams = Team::where('is_active', true)->orderBy('name')->get();

        return view('admin.list-generator.create', compact('teams'));
    }

    public function store(Request $request): View
    {
        $validated = $request->validate([
            'title' => 'required|string|max:255',
            'subtitle' => 'nullable|string|max:255',
            'notes' => 'nullable|string|max:2000',
            'team_id' => 'nullable|exists:teams,id',
            'source' => 'required|in:players,parents,freetext',
            'freetext_rows' => 'nullable|required_if:source,freetext|string|max:50000',
            'columns' => 'nullable|array',
            'custom_columns' => 'nullable|array',
            'custom_columns.*' => 'string|max:100',
        ]);

        $columns = $this->buildColumns($validated);
        $rows = $this->buildRows($validated, $columns);

        // Auto-detect orientation and font size for single-page PDF
        $colCount = count($columns);
        $rowCount = count($rows);
        $orientation = $colCount > 4 ? 'landscape' : 'portrait';

        // Font size calculation for single-page fit
        $fontSize = 10;
        if ($rowCount > 35) {
            $fontSize = 7;
        } elseif ($rowCount > 25) {
            $fontSize = 8;
        } elseif ($rowCount > 15) {
            $fontSize = 9;
        }

        $viewData = [
            'title' => $validated['title'],
            'subtitle' => $validated['subtitle'] ?? null,
            'notes' => $validated['notes'] ?? null,
            'columns' => $columns,
            'rows' => $rows,
            'generatedAt' => now(),
            'orientation' => $orientation,
            'fontSize' => $fontSize,
        ];

        // Generate PDF
        $pdf = Pdf::loadView('admin.list-generator.document', $viewData)
            ->setPaper('a4', $orientation);

        $pdfContent = $pdf->output();

        // Save to file library
        $category = FileCategory::where('slug', 'allgemein')->firstOrFail();
        $storedName = Str::uuid() . '.pdf';
        Storage::disk('local')->put('files/' . $storedName, $pdfContent);

        $file = new File([
            'file_category_id' => $category->id,
            'original_name' => Str::slug($validated['title']) . '.pdf',
            'mime_type' => 'application/pdf',
            'size' => strlen($pdfContent),
        ]);
        $file->stored_name = $storedName;
        $file->disk = 'private';
        $file->uploaded_by = auth()->id();
        $file->save();

        ActivityLog::log('created', __('admin.log_list_generated', ['title' => $validated['title']]), 'File', $file->id);

        return view('admin.list-generator.result', [
            'title' => $validated['title'],
            'subtitle' => $validated['subtitle'] ?? null,
            'notes' => $validated['notes'] ?? null,
            'columns' => $columns,
            'rows' => $rows,
            'file' => $file,
        ]);
    }

    private function buildColumns(array $data): array
    {
        $columns = ['name' => __('ui.name')];
        $selected = $data['columns'] ?? [];

        $playerColumns = [
            'team' => __('admin.nav_teams'),
            'jersey_number' => __('admin.jersey_number'),
            'birth_year' => __('admin.birth_year'),
            'parents' => __('admin.parents'),
            'photo_permission' => __('admin.photo_permission'),
        ];

        $parentColumns = [
            'team' => __('admin.nav_teams'),
            'email' => __('ui.email'),
            'phone' => __('admin.phone'),
            'children' => __('admin.children'),
        ];

        $available = match ($data['source']) {
            'players' => $playerColumns,
            'parents' => $parentColumns,
            default => [],
        };

        foreach ($selected as $col) {
            if (isset($available[$col])) {
                $columns[$col] = $available[$col];
            }
        }

        foreach (($data['custom_columns'] ?? []) as $i => $header) {
            $header = trim($header);
            if ($header !== '') {
                $columns['custom_' . $i] = $header;
            }
        }

        return $columns;
    }

    private function buildRows(array $data, array $columns): array
    {
        if ($data['source'] === 'freetext') {
            return $this->buildFreetextRows($data);
        }

        if ($data['source'] === 'players') {
            return $this->buildPlayerRows($data, $columns);
        }

        return $this->buildParentRows($data, $columns);
    }

    private function buildPlayerRows(array $data, array $columns): array
    {
        $query = Player::with(['team', 'parents'])->where('is_active', true);

        if (!empty($data['team_id'])) {
            $query->where('team_id', $data['team_id']);
        }

        $query->orderBy('last_name')->orderBy('first_name');
        $players = $query->get();

        $rows = [];
        foreach ($players as $player) {
            $row = ['name' => $player->full_name];

            if (isset($columns['team'])) {
                $row['team'] = $player->team->name ?? '–';
            }
            if (isset($columns['jersey_number'])) {
                $row['jersey_number'] = $player->jersey_number ?? '–';
            }
            if (isset($columns['birth_year'])) {
                $row['birth_year'] = $player->birth_year ?? '–';
            }
            if (isset($columns['parents'])) {
                $row['parents'] = $player->parents->map(fn ($p) => $p->name)->implode(', ') ?: '–';
            }
            if (isset($columns['photo_permission'])) {
                $row['photo_permission'] = $player->photo_permission ? __('ui.yes') : __('ui.no');
            }

            foreach ($columns as $key => $header) {
                if (str_starts_with($key, 'custom_')) {
                    $row[$key] = '';
                }
            }

            $rows[] = $row;
        }

        return $rows;
    }

    private function buildParentRows(array $data, array $columns): array
    {
        $query = User::with('children.team')->where('is_active', true);

        if (!empty($data['team_id'])) {
            $query->whereHas('children', fn ($q) => $q->where('team_id', $data['team_id']));
        }

        $query->orderBy('name');
        $users = $query->get();

        $rows = [];
        foreach ($users as $user) {
            $row = ['name' => $user->name];

            if (isset($columns['team'])) {
                $teamNames = $user->children->pluck('team.name')->filter()->unique()->implode(', ');
                $row['team'] = $teamNames ?: '–';
            }
            if (isset($columns['email'])) {
                $row['email'] = $user->email;
            }
            if (isset($columns['phone'])) {
                $row['phone'] = $user->phone ?? '–';
            }
            if (isset($columns['children'])) {
                $row['children'] = $user->children->map(fn ($c) => $c->first_name)->implode(', ') ?: '–';
            }

            foreach ($columns as $key => $header) {
                if (str_starts_with($key, 'custom_')) {
                    $row[$key] = '';
                }
            }

            $rows[] = $row;
        }

        return $rows;
    }

    private function buildFreetextRows(array $data): array
    {
        $lines = array_filter(
            array_map('trim', explode("\n", $data['freetext_rows'] ?? '')),
            fn ($line) => $line !== ''
        );

        // Maximum 200 Zeilen — DoS-Schutz (V10)
        $lines = array_slice($lines, 0, 200);

        return array_map(fn ($line) => ['name' => $line], array_values($lines));
    }
}