<?php

namespace Modules\DocumentManagement\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Inertia\Inertia;
use Modules\DocumentManagement\Models\Document;
use Modules\DocumentManagement\Models\DocumentCategory;
use Modules\ProjectManagement\Models\Project;

class DocumentController extends Controller
{
    public function index(Request $request)
    {
        $query = Document::with(['uploader:id,name', 'category', 'project', 'approvals.approver']);

        if ($search = $request->search) {
            $query->where('title', 'like', "%{$search}%");
        }
        if ($categoryId = $request->category_id) {
            $query->where('category_id', $categoryId);
        }
        if ($projectId = $request->project_id) {
            $query->where('project_id', $projectId);
        }
        if ($status = $request->status) {
            $query->where('status', $status);
        }
        if ($type = $request->documentable_type) {
            $query->where('documentable_type', $type);
        }

        $documents = $query->latest()->paginate(20)->withQueryString();
        $categories = DocumentCategory::all();
        $projects = Project::select('id', 'name')->get();

        return Inertia::render('DocumentManagement::Documents/Index', [
            'documents' => $documents,
            'categories' => $categories,
            'projects' => $projects,
            'filters' => $request->only(['search', 'category_id', 'project_id', 'status', 'documentable_type']),
        ]);
    }

    public function upload(Request $request)
    {
        $validated = $request->validate([
            'title' => 'required|string|max:255',
            'category_id' => 'required|exists:document_categories,id',
            'project_id' => 'nullable|exists:projects,id',
            'description' => 'nullable|string',
            'documentable_type' => 'nullable|string',
            'documentable_id' => 'nullable|integer',
            'file' => 'required|file|max:51200|mimes:pdf,jpg,jpeg,png,doc,docx,xls,xlsx,dwg',
        ]);

        $file = $request->file('file');
        $category = DocumentCategory::find($validated['category_id']);
        $path = $file->store("documents/" . str()->slug($category->name), 'local');

        $document = Document::create([
            'title' => $validated['title'],
            'category_id' => $validated['category_id'],
            'project_id' => $validated['project_id'] ?? null,
            'description' => $validated['description'] ?? null,
            'documentable_type' => $validated['documentable_type'] ?? null,
            'documentable_id' => $validated['documentable_id'] ?? null,
            'status' => 'Pending',
            'uploaded_by' => $request->user()->id,
            'current_file_path' => $path,
            'current_file_name' => $file->getClientOriginalName(),
            'mime_type' => $file->getMimeType(),
            'file_size' => $file->getSize(),
            'version_count' => 1,
        ]);

        // Create initial version
        $document->versions()->create([
            'version_number' => 1,
            'file_path' => $path,
            'file_name' => $file->getClientOriginalName(),
            'mime_type' => $file->getMimeType(),
            'file_size' => $file->getSize(),
            'uploaded_by' => $request->user()->id,
            'change_notes' => 'Initial upload',
        ]);
        
        // Trigger Global Approval Workflow
        $approverIds = [];
        if (\Spatie\Permission\Models\Role::where('name', 'Main Contractor Admin')->exists()) {
            $approverIds = \App\Models\User::role('Main Contractor Admin')->pluck('id')->toArray();
        }
        if (empty($approverIds) && \Spatie\Permission\Models\Role::where('name', 'Super Admin')->exists()) {
            $approverIds = \App\Models\User::role('Super Admin')->pluck('id')->toArray();
        }
        if (!empty($approverIds)) {
            app(\Modules\ApprovalWorkflow\Services\ApprovalService::class)->createChain(
                $document,
                $approverIds,
                'document',
                $request->user()->id,
                "New document uploaded: {$document->title}"
            );
        }

        return back()->with('success', 'Document uploaded successfully and is pending approval.');
    }

    public function uploadVersion(Request $request, Document $document)
    {
        $validated = $request->validate([
            'file' => 'required|file|max:51200|mimes:pdf,jpg,jpeg,png,doc,docx,xls,xlsx,dwg',
            'change_notes' => 'nullable|string|max:500',
        ]);

        $file = $request->file('file');
        $category = $document->category;
        $path = $file->store("documents/" . str()->slug($category->name), 'local');

        $document->addVersion(
            $path,
            $file->getClientOriginalName(),
            $file->getMimeType(),
            $file->getSize(),
            $request->user()->id,
            $validated['change_notes'] ?? null,
        );

        // Reset status to Pending when a new version is uploaded
        $document->update(['status' => 'Pending']);

        // Trigger Global Approval Workflow for the new version
        $approverIds = [];
        if (\Spatie\Permission\Models\Role::where('name', 'Main Contractor Admin')->exists()) {
            $approverIds = \App\Models\User::role('Main Contractor Admin')->pluck('id')->toArray();
        }
        if (empty($approverIds) && \Spatie\Permission\Models\Role::where('name', 'Super Admin')->exists()) {
            $approverIds = \App\Models\User::role('Super Admin')->pluck('id')->toArray();
        }
        if (!empty($approverIds)) {
            app(\Modules\ApprovalWorkflow\Services\ApprovalService::class)->createChain(
                $document,
                $approverIds,
                'document',
                $request->user()->id,
                "New version uploaded for: {$document->title}"
            );
        }

        return back()->with('success', 'New version uploaded. Document status reset to Pending.');
    }

    public function download(Document $document)
    {
        if (!$document->current_file_path || !Storage::disk('local')->exists($document->current_file_path)) {
            return back()->with('error', 'File not found.');
        }

        return Storage::disk('local')->download($document->current_file_path, $document->current_file_name);
    }

    public function downloadVersion(Document $document, int $versionId)
    {
        $version = $document->versions()->findOrFail($versionId);

        if (!Storage::disk('local')->exists($version->file_path)) {
            return back()->with('error', 'Version file not found.');
        }

        return Storage::disk('local')->download($version->file_path, $version->file_name);
    }

    public function versions(Document $document)
    {
        $document->load(['versions.uploader:id,name', 'uploader:id,name', 'approvals.approver', 'category']);

        return Inertia::render('DocumentManagement::Documents/Versions', [
            'document' => $document,
        ]);
    }

    public function destroy(Document $document)
    {
        // Delete all version files
        foreach ($document->versions as $version) {
            Storage::disk('local')->delete($version->file_path);
        }
        if ($document->current_file_path) {
            Storage::disk('local')->delete($document->current_file_path);
        }

        $document->delete();

        return back()->with('success', 'Document deleted.');
    }
}