<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Models\Candidate;
use App\Models\Document;
use App\Models\User;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class CandidateController extends Controller
{
    public function index()
    {
        $candidates = Candidate::with(['user', 'documents', 'attempts', 'tenant', 'jobPosition'])->latest()->get();
        $jobPositions = \App\Models\JobPosition::orderBy('title')->get();
        $tenants = \App\Models\Tenant::orderBy('name')->get();

        return \Inertia\Inertia::render('Admin/Candidates/Index', [
            'candidates' => $candidates,
            'jobPositions' => $jobPositions,
            'tenants' => $tenants
        ]);
    }

    public function comparative()
    {
        $candidates = Candidate::with(['user', 'attempts.quiz'])
            ->whereHas('attempts', function($query) {
                $query->whereNotNull('finished_at');
            })
            ->get();

        return \Inertia\Inertia::render('Admin/Comparative', [
            'candidates' => $candidates
        ]);
    }

    public function store(Request $request)
    {
        $request->validate([
            'name' => 'required|string|max:255',
            'email' => 'required|string|email|max:255|unique:users',
            'phone' => 'nullable|string|max:20',
            'linkedin_url' => 'nullable|url|max:255',
            'cv' => 'nullable|mimes:pdf|max:5120',
            'cover_letter' => 'nullable|mimes:pdf|max:5120',
            'tenant_id' => 'nullable|exists:tenants,id',
            'job_position_id' => 'nullable|exists:job_positions,id',
        ]);

        $password = Str::random(10);

        $user = User::create([
            'name' => $request->name,
            'email' => $request->email,
            'password' => Hash::make(Str::random(12)),
            'role' => 'candidate',
            'tenant_id' => auth()->user()->isSuperAdmin() ? $request->tenant_id : auth()->user()->tenant_id,
        ]);

        $candidate = $user->candidate()->create([
            'phone' => $request->phone,
            'linkedin_url' => $request->linkedin_url,
            'status' => 'en_attente',
            'tenant_id' => auth()->user()->isSuperAdmin() ? $request->tenant_id : auth()->user()->tenant_id,
            'job_position_id' => $request->job_position_id,
        ]);

        $this->storeDocument($candidate, $request->file('cv'), 'cv');
        $this->storeDocument($candidate, $request->file('cover_letter'), 'cover_letter');

        return back()->with('success', 'Candidat créé avec succès. Mot de passe généré: ' . $password);
    }

    public function show(Candidate $candidate)
    {
        $candidate->load([
            'user', 
            'documents', 
            'attempts.quiz', 
            'attempts.answers.question',
            'attempts.answers.option',
            'jobPosition'
        ]);

        return \Inertia\Inertia::render('Admin/Candidates/Show', [
            'candidate' => $candidate,
            'jobPositions' => \App\Models\JobPosition::all(),
            'ai_config' => [
                'default' => env('AI_DEFAULT_PROVIDER', 'ollama'),
                'enabled_providers' => array_filter([
                    'ollama' => true, // Toujours dispo car local ou simulé
                    'openai' => !empty(env('OPENAI_API_KEY')),
                    'anthropic' => !empty(env('ANTHROPIC_API_KEY')),
                    'gemini' => !empty(env('GEMINI_API_KEY')),
                ], function($v) { return $v; })
            ]
        ]);
    }

    public function destroy(Candidate $candidate)
    {
        $user = $candidate->user;

        // Delete files
        foreach ($candidate->documents as $doc) {
            Storage::disk('local')->delete($doc->file_path);
        }

        // Delete user (cascades to candidate, documents, attempts via DB constraints usually)
        $user->delete();

        return redirect()->route('admin.candidates.index')->with('success', 'Candidat supprimé avec succès.');
    }

    public function update(Request $request, Candidate $candidate)
    {
        $request->validate([
            'cv' => 'nullable|file|mimes:pdf|max:5120',
            'cover_letter' => 'nullable|file|mimes:pdf|max:5120',
        ]);

        if ($request->hasFile('cv')) {
            $this->replaceDocument($candidate, $request->file('cv'), 'cv');
        }

        if ($request->hasFile('cover_letter')) {
            $this->replaceDocument($candidate, $request->file('cover_letter'), 'cover_letter');
        }

        return back()->with('success', 'Documents mis à jour avec succès.');
    }

    public function updateNotes(Request $request, Candidate $candidate)
    {
        $request->validate([
            'notes' => 'nullable|string',
        ]);

        $candidate->update([
            'notes' => $request->notes,
        ]);

        return back()->with('success', 'Notes mises à jour avec succès.');
    }

    public function updateScores(Request $request, Candidate $candidate)
    {
        $request->validate([
            'cv_score' => 'nullable|numeric|min:0|max:20',
            'motivation_score' => 'nullable|numeric|min:0|max:10',
            'interview_score' => 'nullable|numeric|min:0|max:30',
        ]);

        $candidate->update($request->only(['cv_score', 'motivation_score', 'interview_score']));

        return back()->with('success', 'Notes mises à jour avec succès.');
    }

    public function updatePosition(Request $request, Candidate $candidate)
    {
        $request->validate([
            'job_position_id' => 'nullable|exists:job_positions,id',
        ]);

        $candidate->update([
            'job_position_id' => $request->job_position_id,
        ]);

        return back()->with('success', 'Fiche de poste associée au candidat.');
    }

    public function resetPassword(Candidate $candidate)
    {
        $password = Str::random(10);
        $candidate->user->update([
            'password' => Hash::make($password)
        ]);

        return back()->with('success', 'Nouveau mot de passe généré: ' . $password);
    }

    private function replaceDocument(Candidate $candidate, $file, string $type)
    {
        // Delete old one if exists
        $oldDoc = $candidate->documents()->where('type', $type)->first();
        if ($oldDoc) {
            Storage::disk('local')->delete($oldDoc->file_path);
            $oldDoc->delete();
        }

        $this->storeDocument($candidate, $file, $type);
    }

    private function storeDocument(Candidate $candidate, $file, string $type)
    {
        if (!$file) {
            return;
        }

        $path = $file->store('private/documents/' . $candidate->id, 'local');

        Document::create([
            'candidate_id' => $candidate->id,
            'type' => $type,
            'file_path' => $path,
            'original_name' => $file->getClientOriginalName(),
        ]);
    }
}