<?php

    namespace Modules\Webstatement\Http\Controllers;

    use App\Http\Controllers\Controller;
    use Carbon\Carbon;
    use Exception;
    use Illuminate\Http\Request;
    use Illuminate\Support\Facades\Auth;
    use Illuminate\Support\Facades\Mail;
    use Illuminate\Support\Facades\Storage;
    use Log;
    use Modules\Basicdata\Models\Branch;
    use Modules\Webstatement\Http\Requests\PrintStatementRequest;
    use Modules\Webstatement\Mail\StatementEmail;
    use Modules\Webstatement\Models\PrintStatementLog;
    use ZipArchive;

    class PrintStatementController extends Controller
    {
        /**
         * Display a listing of the statements.
         */
        public function index(Request $request)
        {
            $branches = Branch::orderBy('name')->get();

            return view('webstatement::statements.index', compact('branches'));
        }

        /**
         * Store a newly created statement request.
         */
        public function store(PrintStatementRequest $request)
        {
            $validated = $request->validated();

            // Add user tracking data
            $validated['user_id']    = Auth::id();
            $validated['created_by'] = Auth::id();
            $validated['ip_address'] = $request->ip();
            $validated['user_agent'] = $request->userAgent();

            // Create the statement log
            $statement = PrintStatementLog::create($validated);

            // Process statement availability check (this would be implemented based on your system)
            $this->checkStatementAvailability($statement);

            return redirect()->route('statements.index')
                             ->with('success', 'Statement request has been created successfully.');
        }

        /**
         * Show the form for creating a new statement request.
         */
        public function create()
        {
            $branches = Branch::orderBy('name')->get();
            return view('webstatement::statements.create', compact('branches'));
        }

        /**
         * Check if the statement is available in the system.
         * This is a placeholder method - implement according to your system.
         */
        protected function checkStatementAvailability(PrintStatementLog $statement)
        {
            // This would be implemented based on your system's logic
            // For example, checking an API or database for statement availability
            $disk = Storage::disk('sftpStatement');

            //format folder /periode/Print/branch_code/account_number.pdf
            $filePath = "{$statement->period_from}/Print/{$statement->branch_code}/{$statement->account_number}.pdf";

            // Check if the statement exists in the storage
            if ($statement->is_period_range && $statement->period_to) {
                $periodFrom = Carbon::createFromFormat('Ym', $statement->period_from);
                $periodTo   = Carbon::createFromFormat('Ym', $statement->period_to);

                // Loop through each month in the range
                $missingPeriods   = [];
                $availablePeriods = [];

                for ($period = clone $periodFrom; $period->lte($periodTo); $period->addMonth()) {
                    $periodFormatted = $period->format('Ym');
                    $periodPath      = $periodFormatted . "/Print/{$statement->branch_code}/{$statement->account_number}.pdf";

                    if ($disk->exists($periodPath)) {
                        $availablePeriods[] = $periodFormatted;
                    } else {
                        $missingPeriods[] = $periodFormatted;
                    }
                }


                // If any period is missing, the statement is not available
                if (count($missingPeriods) > 0) {
                    $notes = "Missing periods: " . implode(', ', $missingPeriods);
                    $statement->update([
                        'is_available' => false,
                        'remarks'      => $notes,
                        'updated_by'   => Auth::id()
                    ]);
                    return;
                } else {
                    // All periods are available
                    $statement->update([
                        'is_available' => true,
                        'updated_by'   => Auth::id()
                    ]);
                    return;
                }
            } else if ($disk->exists($filePath)) {
                $statement->update([
                    'is_available' => true,
                    'updated_by'   => Auth::id()
                ]);
                return;
            }

            $statement->update([
                'is_available' => false,
                'updated_by'   => Auth::id()
            ]);
            return;
        }

        /**
         * Display the specified statement.
         */
        public function show(PrintStatementLog $statement)
        {
            $statement->load(['user', 'branch', 'creator', 'authorizer']);
            return view('webstatement::statements.show', compact('statement'));
        }

        /**
         * Download the statement if available and authorized.
         */
        public function download(PrintStatementLog $statement)
        {
            // Check if statement is available and authorized
            if (!$statement->is_available) {
                return back()->with('error', 'Statement is not available for download.');
            }

            /* if ($statement->authorization_status !== 'approved') {
                 return back()->with('error', 'Statement download requires authorization.');
             }*/

            // Update download status
            $statement->update([
                'is_downloaded' => true,
                'downloaded_at' => now(),
                'updated_by'    => Auth::id()
            ]);

            // Generate or fetch the statement file (implementation depends on your system)
            $disk     = Storage::disk('sftpStatement');
            $filePath = "{$statement->period_from}/Print/{$statement->branch_code}/{$statement->account_number}.pdf";

            if ($statement->is_period_range && $statement->period_to) {
                $periodFrom = Carbon::createFromFormat('Ym', $statement->period_from);
                $periodTo   = Carbon::createFromFormat('Ym', $statement->period_to);

                // Loop through each month in the range
                $missingPeriods   = [];
                $availablePeriods = [];

                for ($period = clone $periodFrom; $period->lte($periodTo); $period->addMonth()) {
                    $periodFormatted = $period->format('Ym');
                    $periodPath      = $periodFormatted . "/Print/{$statement->branch_code}/{$statement->account_number}.pdf";

                    if ($disk->exists($periodPath)) {
                        $availablePeriods[] = $periodFormatted;
                    } else {
                        $missingPeriods[] = $periodFormatted;
                    }
                }

                // If any period is missing, the statement is not available
                if (count($availablePeriods) > 0) {
                    // Create a temporary zip file
                    $zipFileName = "{$statement->account_number}_{$statement->period_from}_to_{$statement->period_to}.zip";
                    $zipFilePath = storage_path("app/temp/{$zipFileName}");

                    // Ensure the temp directory exists
                    if (!file_exists(storage_path('app/temp'))) {
                        mkdir(storage_path('app/temp'), 0755, true);
                    }

                    // Create a new zip archive
                    $zip = new ZipArchive();
                    if ($zip->open($zipFilePath, ZipArchive::CREATE | ZipArchive::OVERWRITE) === true) {
                        // Add each available statement to the zip
                        foreach ($availablePeriods as $period) {
                            $filePath      = "{$period}/Print/{$statement->branch_code}/{$statement->account_number}.pdf";
                            $localFilePath = storage_path("app/temp/{$statement->account_number}_{$period}.pdf");

                            // Download the file from SFTP to local storage temporarily
                            file_put_contents($localFilePath, $disk->get($filePath));

                            // Add the file to the zip
                            $zip->addFile($localFilePath, "{$statement->account_number}_{$period}.pdf");
                        }

                        $zip->close();

                        // Clean up temporary files
                        foreach ($availablePeriods as $period) {
                            $localFilePath = storage_path("app/temp/{$statement->account_number}_{$period}.pdf");
                            if (file_exists($localFilePath)) {
                                unlink($localFilePath);
                            }
                        }

                        // Return the zip file for download
                        return response()->download($zipFilePath, $zipFileName)->deleteFileAfterSend(true);
                    } else {
                        return back()->with('error', 'Failed to create zip archive.');
                    }
                } else {
                    return back()->with('error', 'No statements available for download.');
                }
            } else if ($disk->exists($filePath)) {
                return $disk->download($filePath, "{$statement->account_number}_{$statement->period_from}.pdf");
            }
        }

        /**
         * Authorize a statement request.
         */
        public function authorize(Request $request, PrintStatementLog $statement)
        {
            $request->validate([
                'authorization_status' => ['required', Rule::in(['approved', 'rejected'])],
                'remarks'              => ['nullable', 'string', 'max:255'],
            ]);

            // Update authorization status
            $statement->update([
                'authorization_status' => $request->authorization_status,
                'authorized_by'        => Auth::id(),
                'authorized_at'        => now(),
                'remarks'              => $request->remarks,
                'updated_by'           => Auth::id()
            ]);

            $statusText = $request->authorization_status === 'approved' ? 'approved' : 'rejected';

            return redirect()->route('statements.show', $statement->id)
                             ->with('success', "Statement request has been {$statusText} successfully.");

        }

        /**
         * Provide data for datatables.
         */
        public function dataForDatatables(Request $request)
        {
            // Check permissions if needed
            // if (!auth()->user()->can('view_statements')) {
            //     abort(403, 'Sorry! You are not allowed to view statements.');
            // }

            // Retrieve data from the database
            $query = PrintStatementLog::query();

            // Apply search filter if provided
            if ($request->has('search') && !empty($request->get('search'))) {
                $search = $request->get('search');
                $query->where(function ($q) use ($search) {
                    $q->where('account_number', 'LIKE', "%$search%")
                      ->orWhere('branch_code', 'LIKE', "%$search%")
                      ->orWhere('period_from', 'LIKE', "%$search%")
                      ->orWhere('period_to', 'LIKE', "%$search%")
                      ->orWhere('authorization_status', 'LIKE', "%$search%");
                });
            }

            // Apply column filters if provided
            if ($request->has('filters') && !empty($request->get('filters'))) {
                $filters = json_decode($request->get('filters'), true);

                foreach ($filters as $filter) {
                    if (!empty($filter['value'])) {
                        if ($filter['column'] === 'branch_code') {
                            $query->where('branch_code', $filter['value']);
                        } else if ($filter['column'] === 'authorization_status') {
                            $query->where('authorization_status', $filter['value']);
                        } else if ($filter['column'] === 'is_downloaded') {
                            $query->where('is_downloaded', filter_var($filter['value'], FILTER_VALIDATE_BOOLEAN));
                        }
                    }
                }
            }

            // Apply sorting if provided
            if ($request->has('sortOrder') && !empty($request->get('sortOrder'))) {
                $order  = $request->get('sortOrder');
                $column = $request->get('sortField');

                // Map frontend column names to database column names if needed
                $columnMap = [
                    'branch'  => 'branch_code',
                    'account' => 'account_number',
                    'period'  => 'period_from',
                    'status'  => 'authorization_status',
                    'remarks' => 'remarks',
                    // Add more mappings as needed
                ];

                $dbColumn = $columnMap[$column] ?? $column;
                $query->orderBy($dbColumn, $order);
            } else {
                // Default sorting
                $query->latest('created_at');
            }

            // Get the total count of records
            $totalRecords = $query->count();

            // Apply pagination if provided
            if ($request->has('page') && $request->has('size')) {
                $page   = $request->get('page');
                $size   = $request->get('size');
                $offset = ($page - 1) * $size; // Calculate the offset

                $query->skip($offset)->take($size);
            }

            // Get the filtered count of records
            $filteredRecords = $query->count();

            // Eager load relationships to avoid N+1 query problems
            $query->with(['user', 'branch', 'authorizer']);

            // Get the data for the current page
            $data = $query->get()->map(function ($item) {
                // Transform data for frontend if needed
                return [
                    'id'                   => $item->id,
                    'branch_code'          => $item->branch_code,
                    'branch_name'          => $item->branch->name ?? 'N/A',
                    'account_number'       => $item->account_number,
                    'period_from'          => $item->period_from,
                    'period_to'            => $item->is_period_range ? $item->period_to : null,
                    'authorization_status' => $item->authorization_status,
                    'is_available'         => $item->is_available,
                    'is_downloaded'        => $item->is_downloaded,
                    'created_at'           => dateFormat($item->created_at, 1, 1),
                    'created_by'           => $item->user->name ?? 'N/A',
                    'authorized_by'        => $item->authorizer ? $item->authorizer->name : null,
                    'authorized_at'        => $item->authorized_at ? $item->authorized_at->format('Y-m-d H:i:s') : null,
                    'remarks'              => $item->remarks,
                ];
            });

            // Calculate the page count
            $pageCount = ceil($filteredRecords / ($request->get('size') ?: 1));

            // Calculate the current page number
            $currentPage = $request->get('page') ?: 1;

            // Return the response data as a JSON object
            return response()->json([
                'draw'            => $request->get('draw'),
                'recordsTotal'    => $totalRecords,
                'recordsFiltered' => $filteredRecords,
                'pageCount'       => $pageCount,
                'page'            => $currentPage,
                'totalCount'      => $totalRecords,
                'data'            => $data,
            ]);
        }

        public function destroy(PrintStatementLog $statement)
        {
            // Delete the statement
            $statement->delete();

            return response()->json([
                'message' => 'Statement deleted successfully.',
            ]);
        }

        /**
         * Send statement to email
         */
        public function sendEmail($id)
        {
            $statement = PrintStatementLog::findOrFail($id);
            // Check if statement has email
            if (empty($statement->email)) {
                return redirect()->back()->with('error', 'No email address provided for this statement.');
            }

            // Check if statement is available
            if (!$statement->is_available) {
                return redirect()->back()->with('error', 'Statement is not available for sending.');
            }

            try {
                $disk     = Storage::disk('sftpStatement');
                $filePath = "{$statement->period_from}/Print/{$statement->branch_code}/{$statement->account_number}.pdf";

                if ($statement->is_period_range && $statement->period_to) {
                    $periodFrom = Carbon::createFromFormat('Ym', $statement->period_from);
                    $periodTo   = Carbon::createFromFormat('Ym', $statement->period_to);

                    // Loop through each month in the range
                    $missingPeriods   = [];
                    $availablePeriods = [];

                    for ($period = clone $periodFrom; $period->lte($periodTo); $period->addMonth()) {
                        $periodFormatted = $period->format('Ym');
                        $periodPath      = $periodFormatted . "/Print/{$statement->branch_code}/{$statement->account_number}.pdf";

                        if ($disk->exists($periodPath)) {
                            $availablePeriods[] = $periodFormatted;
                        } else {
                            $missingPeriods[] = $periodFormatted;
                        }
                    }

                    // If any period is available, create a zip and send it
                    if (count($availablePeriods) > 0) {
                        // Create a temporary zip file
                        $zipFileName = "{$statement->account_number}_{$statement->period_from}_to_{$statement->period_to}.zip";
                        $zipFilePath = storage_path("app/temp/{$zipFileName}");

                        // Ensure the temp directory exists
                        if (!file_exists(storage_path('app/temp'))) {
                            mkdir(storage_path('app/temp'), 0755, true);
                        }

                        // Create a new zip archive
                        $zip = new ZipArchive();
                        if ($zip->open($zipFilePath, ZipArchive::CREATE | ZipArchive::OVERWRITE) === true) {
                            // Add each available statement to the zip
                            foreach ($availablePeriods as $period) {
                                $filePath      = "{$period}/Print/{$statement->branch_code}/{$statement->account_number}.pdf";
                                $localFilePath = storage_path("app/temp/{$statement->account_number}_{$period}.pdf");

                                // Download the file from SFTP to local storage temporarily
                                file_put_contents($localFilePath, $disk->get($filePath));

                                // Add the file to the zip
                                $zip->addFile($localFilePath, "{$statement->account_number}_{$period}.pdf");
                            }

                            $zip->close();

                            // Send email with zip attachment
                            Mail::to($statement->email)
                                ->send(new StatementEmail($statement, $zipFilePath, true));

                            // Clean up temporary files
                            foreach ($availablePeriods as $period) {
                                $localFilePath = storage_path("app/temp/{$statement->account_number}_{$period}.pdf");
                                if (file_exists($localFilePath)) {
                                    unlink($localFilePath);
                                }
                            }

                            // Delete the zip file after sending
                            if (file_exists($zipFilePath)) {
                                unlink($zipFilePath);
                            }
                        } else {
                            return redirect()->back()->with('error', 'Failed to create zip archive for email.');
                        }
                    } else {
                        return redirect()->back()->with('error', 'No statements available for sending.');
                    }
                } else if ($disk->exists($filePath)) {
                    // For single period statements
                    $localFilePath = storage_path("app/temp/{$statement->account_number}_{$statement->period_from}.pdf");

                    // Ensure the temp directory exists
                    if (!file_exists(storage_path('app/temp'))) {
                        mkdir(storage_path('app/temp'), 0755, true);
                    }

                    // Download the file from SFTP to local storage temporarily
                    file_put_contents($localFilePath, $disk->get($filePath));

                    // Send email with PDF attachment
                    Mail::to($statement->email)
                        ->send(new StatementEmail($statement, $localFilePath, false));

                    // Delete the temporary file
                    if (file_exists($localFilePath)) {
                        unlink($localFilePath);
                    }
                } else {
                    return redirect()->back()->with('error', 'Statement file not found.');
                }

                // Update statement record to mark as emailed
                $statement->update([
                    'email_sent_at' => now(),
                    'updated_by'    => Auth::id()
                ]);

                return redirect()->back()->with('success', 'Statement has been sent to ' . $statement->email);
            } catch (Exception $e) {
                // Log the error
                Log::error('Failed to send statement email: ' . $e->getMessage());

                return redirect()->back()->with('error', 'Failed to send email: ' . $e->getMessage());
            }
        }

        /**
         * Generate or fetch the statement file.
         * This is a placeholder method - implement according to your system.
         */
        protected function generateStatementFile(PrintStatementLog $statement)
        {
            // This would be implemented based on your system's logic
            // For example, calling an API to generate a PDF or fetching from storage

            // Placeholder implementation - return a dummy path
            $tempFile = tempnam(sys_get_temp_dir(), 'statement_');
            file_put_contents($tempFile, 'Statement content would go here');
            return $tempFile;
        }

        /**
         * Send statement to email
         */

        /**
         * Generate a filename for the statement download.
         */
        protected function generateFileName(PrintStatementLog $statement)
        {
            $accountNumber = $statement->account_number;

            if ($statement->is_period_range) {
                return "statement_{$accountNumber}_{$statement->period_from}_to_{$statement->period_to}.pdf";
            }

            return "statement_{$accountNumber}_{$statement->period_from}.pdf";
        }
    }