<?php

namespace App\Http\Requests\Resume;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Support\Facades\Auth;

/**
 * Update Resume Form Request
 * 
 * Validates data for updating an existing resume with comprehensive validation rules.
 * Implements business logic validations and data sanitization for resume updates.
 * 
 * @author David Valera Melendez <david@valera-melendez.de>
 * @since February  2025
 */
class UpdateResumeRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        $resume = $this->route('resume');
        return Auth::check() && $resume && $resume->user_id === Auth::id();
    }

    /**
     * Get the validation rules that apply to the request.
     */
    public function rules(): array
    {
        $resumeId = $this->route('resume')->id ?? null;
        
        return [
            'title' => [
                'sometimes',
                'required',
                'string',
                'min:3',
                'max:255',
                'regex:/^[a-zA-Z0-9\s\-\_\.\,\!\?]+$/',
            ],
            'description' => [
                'nullable',
                'string',
                'max:1000',
            ],
            'template' => [
                'sometimes',
                'required',
                'string',
                'in:professional,modern,executive,minimal,technical',
            ],
            'status' => [
                'sometimes',
                'string',
                'in:draft,published,archived',
            ],
            'content' => [
                'nullable',
                'array',
            ],
            'content.personal_info' => [
                'nullable',
                'array',
            ],
            'content.personal_info.full_name' => [
                'nullable',
                'string',
                'max:255',
            ],
            'content.personal_info.title' => [
                'nullable',
                'string',
                'max:255',
            ],
            'content.personal_info.email' => [
                'nullable',
                'email',
                'max:255',
            ],
            'content.personal_info.phone' => [
                'nullable',
                'string',
                'max:20',
                'regex:/^[\+]?[0-9\s\-\(\)]+$/',
            ],
            'content.personal_info.location' => [
                'nullable',
                'string',
                'max:255',
            ],
            'content.personal_info.website' => [
                'nullable',
                'url',
                'max:255',
            ],
            'content.personal_info.linkedin' => [
                'nullable',
                'url',
                'max:255',
                'regex:/^https:\/\/(www\.)?linkedin\.com\/in\/[a-zA-Z0-9\-]+\/?$/',
            ],
            'content.personal_info.github' => [
                'nullable',
                'url',
                'max:255',
                'regex:/^https:\/\/(www\.)?github\.com\/[a-zA-Z0-9\-]+\/?$/',
            ],
            'content.summary' => [
                'nullable',
                'string',
                'max:2000',
            ],
            'content.experience' => [
                'nullable',
                'array',
                'max:20',
            ],
            'content.experience.*.company' => [
                'required_with:content.experience',
                'string',
                'max:255',
            ],
            'content.experience.*.position' => [
                'required_with:content.experience',
                'string',
                'max:255',
            ],
            'content.experience.*.location' => [
                'nullable',
                'string',
                'max:255',
            ],
            'content.experience.*.start_date' => [
                'required_with:content.experience',
                'date',
                'before_or_equal:today',
            ],
            'content.experience.*.end_date' => [
                'nullable',
                'date',
                'after:content.experience.*.start_date',
                'before_or_equal:today',
            ],
            'content.experience.*.current' => [
                'boolean',
            ],
            'content.experience.*.description' => [
                'nullable',
                'string',
                'max:2000',
            ],
            'content.experience.*.achievements' => [
                'nullable',
                'array',
                'max:10',
            ],
            'content.experience.*.achievements.*' => [
                'string',
                'max:500',
            ],
            'content.education' => [
                'nullable',
                'array',
                'max:10',
            ],
            'content.education.*.institution' => [
                'required_with:content.education',
                'string',
                'max:255',
            ],
            'content.education.*.degree' => [
                'required_with:content.education',
                'string',
                'max:255',
            ],
            'content.education.*.field' => [
                'nullable',
                'string',
                'max:255',
            ],
            'content.education.*.start_date' => [
                'required_with:content.education',
                'date',
                'before_or_equal:today',
            ],
            'content.education.*.end_date' => [
                'nullable',
                'date',
                'after:content.education.*.start_date',
                'before_or_equal:today',
            ],
            'content.education.*.gpa' => [
                'nullable',
                'numeric',
                'min:0',
                'max:4',
            ],
            'content.education.*.description' => [
                'nullable',
                'string',
                'max:1000',
            ],
            'content.skills' => [
                'nullable',
                'array',
            ],
            'content.projects' => [
                'nullable',
                'array',
                'max:15',
            ],
            'content.projects.*.name' => [
                'required_with:content.projects',
                'string',
                'max:255',
            ],
            'content.projects.*.description' => [
                'nullable',
                'string',
                'max:1000',
            ],
            'content.projects.*.url' => [
                'nullable',
                'url',
                'max:255',
            ],
            'content.projects.*.technologies' => [
                'nullable',
                'array',
                'max:20',
            ],
            'content.certifications' => [
                'nullable',
                'array',
                'max:20',
            ],
            'content.certifications.*.name' => [
                'required_with:content.certifications',
                'string',
                'max:255',
            ],
            'content.certifications.*.issuer' => [
                'required_with:content.certifications',
                'string',
                'max:255',
            ],
            'content.certifications.*.date' => [
                'required_with:content.certifications',
                'date',
                'before_or_equal:today',
            ],
            'content.certifications.*.url' => [
                'nullable',
                'url',
                'max:255',
            ],
            'content.languages' => [
                'nullable',
                'array',
                'max:10',
            ],
            'content.languages.*.language' => [
                'required_with:content.languages',
                'string',
                'max:100',
            ],
            'content.languages.*.level' => [
                'required_with:content.languages',
                'string',
                'in:Native,Fluent,Advanced,Intermediate,Basic',
            ],
            'settings' => [
                'nullable',
                'array',
            ],
            'settings.color_scheme' => [
                'nullable',
                'string',
                'in:blue,green,red,purple,orange,gray,black',
            ],
            'settings.font_family' => [
                'nullable',
                'string',
                'in:Arial,Times New Roman,Calibri,Helvetica,Georgia',
            ],
            'settings.font_size' => [
                'nullable',
                'integer',
                'min:8',
                'max:16',
            ],
            'settings.line_spacing' => [
                'nullable',
                'numeric',
                'min:1.0',
                'max:2.0',
            ],
            'settings.margin' => [
                'nullable',
                'integer',
                'min:10',
                'max:30',
            ],
            'settings.show_photo' => [
                'boolean',
            ],
            'is_public' => [
                'boolean',
            ],
            'allow_comments' => [
                'boolean',
            ],
            'password' => [
                'nullable',
                'string',
                'min:6',
                'max:50',
            ],
            'expires_at' => [
                'nullable',
                'date',
                'after:today',
            ],
        ];
    }

    /**
     * Get custom error messages for validation rules.
     */
    public function messages(): array
    {
        return [
            'title.required' => 'Resume title is required.',
            'title.min' => 'Resume title must be at least 3 characters.',
            'title.regex' => 'Resume title contains invalid characters.',
            'template.in' => 'Selected template is not available.',
            'status.in' => 'Invalid resume status.',
            'content.personal_info.email.email' => 'Please enter a valid email address.',
            'content.personal_info.phone.regex' => 'Please enter a valid phone number.',
            'content.personal_info.linkedin.regex' => 'Please enter a valid LinkedIn profile URL.',
            'content.personal_info.github.regex' => 'Please enter a valid GitHub profile URL.',
            'content.experience.max' => 'You cannot have more than 20 work experiences.',
            'content.education.max' => 'You cannot have more than 10 education entries.',
            'content.projects.max' => 'You cannot have more than 15 projects.',
            'content.certifications.max' => 'You cannot have more than 20 certifications.',
            'content.languages.max' => 'You cannot have more than 10 languages.',
            'content.experience.*.end_date.after' => 'End date must be after start date.',
            'content.education.*.gpa.max' => 'GPA cannot exceed 4.0.',
            'content.languages.*.level.in' => 'Invalid language proficiency level.',
            'settings.font_size.min' => 'Font size must be at least 8.',
            'settings.font_size.max' => 'Font size cannot exceed 16.',
            'settings.line_spacing.min' => 'Line spacing must be at least 1.0.',
            'settings.line_spacing.max' => 'Line spacing cannot exceed 2.0.',
            'expires_at.after' => 'Expiration date must be in the future.',
            'password.min' => 'Password must be at least 6 characters.',
        ];
    }

    /**
     * Prepare the data for validation.
     */
    protected function prepareForValidation(): void
    {
        if ($this->has('title')) {
            $this->merge(['title' => trim($this->title)]);
        }
        
        if ($this->has('description')) {
            $this->merge(['description' => $this->description ? trim($this->description) : null]);
        }

        $this->merge([
            'is_public' => $this->boolean('is_public'),
            'allow_comments' => $this->boolean('allow_comments'),
        ]);

                
        if ($this->has('content.personal_info')) {
            $personalInfo = $this->input('content.personal_info', []);
            
            if (isset($personalInfo['email'])) {
                $personalInfo['email'] = strtolower(trim($personalInfo['email']));
            }
            
            $this->merge(['content' => array_merge($this->input('content', []), [
                'personal_info' => $personalInfo
            ])]);
        }
    }

    /**
     * Configure the validator instance.
     */
    public function withValidator($validator): void
    {
        $validator->after(function ($validator) {
            $resume = $this->route('resume');
            
            if ($this->has('title')) {
                $userId = Auth::id();
                $existingResume = \App\Models\Resume::where('user_id', $userId)
                    ->where('title', $this->title)
                    ->where('id', '!=', $resume->id)
                    ->first();
                    
                if ($existingResume) {
                    $validator->errors()->add(
                        'title',
                        'You already have a resume with this title. Please choose a different title.'
                    );
                }
            }

            if ($this->has('content.experience') && is_array($this->content['experience'])) {
                foreach ($this->content['experience'] as $index => $experience) {
                    if (!empty($experience['start_date']) && !empty($experience['end_date'])) {
                        $startDate = Carbon::parse($experience['start_date']);
                        $endDate = Carbon::parse($experience['end_date']);
                        
                        if ($startDate->greaterThan($endDate)) {
                            $validator->errors()->add(
                                "content.experience.{$index}.end_date",
                                'End date must be after start date.'
                            );
                        }
                    }
                }
            }

            if ($this->has('status') && $this->status === 'published') {
                $content = $this->input('content', []);
                $requiredSections = ['personal_info', 'summary'];
                
                foreach ($requiredSections as $section) {
                    if (empty($content[$section])) {
                        $validator->errors()->add(
                            'status',
                            "Cannot publish resume: {$section} section is required."
                        );
                    }
                }
            }
        });
    }

    /**
     * Handle a failed validation attempt.
     */
    protected function failedValidation($validator): void
    {
        $resume = $this->route('resume');
        
        logger()->warning('Resume update validation failed', [
            'user_id' => Auth::id(),
            'resume_id' => $resume->id ?? null,
            'title' => $this->input('title'),
            'errors' => $validator->errors()->toArray(),
        ]);

        parent::failedValidation($validator);
    }
}