import Joi from 'joi';

// Consent validation schemas
export const consentSchema = Joi.object({
    type: Joi.string()
        .valid('marketing', 'analytics', 'data_processing', 'third_party_sharing', 'cookies')
        .required(),
    purposes: Joi.array()
        .items(Joi.string())
        .min(1)
        .required(),
    duration: Joi.number()
        .integer()
        .min(1)
        .max(730) // Max 2 years
        .default(365),
    renewable: Joi.boolean()
        .default(true),
    location: Joi.object({
        country: Joi.string().length(2),
        region: Joi.string(),
        city: Joi.string()
    }),
    preferences: Joi.object({
        channels: Joi.array().items(
            Joi.string().valid('email', 'sms', 'push', 'in_app')
        ),
        frequency: Joi.string().valid('always', 'daily', 'weekly', 'monthly'),
        topics: Joi.array().items(Joi.string())
    })
});

// Data request validation schemas
export const dataRequestSchema = Joi.object({
    userId: Joi.string()
        .required(),
    type: Joi.string()
        .valid('access', 'portability', 'deletion', 'rectification', 'restriction', 'objection')
        .required(),
    requestDetails: Joi.object({
        scope: Joi.string()
            .valid('all', 'specific')
            .default('all'),
        dataCategories: Joi.when('scope', {
            is: 'specific',
            then: Joi.array().items(Joi.string()).min(1).required(),
            otherwise: Joi.array().items(Joi.string())
        }),
        format: Joi.string()
            .valid('json', 'csv', 'xml')
            .default('json'),
        delivery: Joi.string()
            .valid('download', 'email')
            .default('download'),
        corrections: Joi.when('type', {
            is: 'rectification',
            then: Joi.object().required(),
            otherwise: Joi.object()
        }),
        restrictions: Joi.when('type', {
            is: 'restriction',
            then: Joi.array().items(Joi.object({
                purpose: Joi.string().required(),
                restriction: Joi.string().required()
            })).required(),
            otherwise: Joi.array()
        }),
        objections: Joi.when('type', {
            is: 'objection',
            then: Joi.array().items(Joi.object({
                purpose: Joi.string().required(),
                reason: Joi.string().required()
            })).required(),
            otherwise: Joi.array()
        })
    }).required(),
    reason: Joi.string()
        .max(500),
    regulation: Joi.string()
        .valid('gdpr', 'ccpa', 'lgpd', 'other')
        .default('gdpr')
});

// Violation validation schemas
export const violationSchema = Joi.object({
    type: Joi.string()
        .valid(
            'unauthorized_access',
            'data_leak',
            'consent_expired',
            'retention_exceeded',
            'unauthorized_sharing',
            'security_breach',
            'non_compliance',
            'data_access_denied',
            'notification_failure'
        )
        .required(),
    severity: Joi.string()
        .valid('low', 'medium', 'high', 'critical')
        .required(),
    details: Joi.object({
        description: Joi.string()
            .required(),
        affectedUsers: Joi.number()
            .integer()
            .min(0)
            .required(),
        affectedData: Joi.array()
            .items(Joi.string())
            .required(),
        regulation: Joi.string()
            .valid('gdpr', 'ccpa', 'lgpd', 'other')
            .required(),
        articles: Joi.array()
            .items(Joi.string()),
        detectionMethod: Joi.string()
            .valid('automated', 'manual', 'user_report', 'audit')
            .required()
    }).required(),
    remediation: Joi.object({
        status: Joi.string()
            .valid('pending', 'in_progress', 'completed')
            .default('pending'),
        actions: Joi.array().items(Joi.object({
            action: Joi.string().required(),
            description: Joi.string(),
            targetDate: Joi.date(),
            status: Joi.string().valid('pending', 'completed').default('pending')
        }))
    })
});

// Validation middleware
export const validateConsent = (req, res, next) => {
    const { error } = consentSchema.validate(req.body);
    if (error) {
        return res.status(400).json({
            success: false,
            error: 'Validation error',
            details: error.details.map(d => d.message)
        });
    }
    next();
};

export const validateDataRequest = (req, res, next) => {
    const { error } = dataRequestSchema.validate(req.body);
    if (error) {
        return res.status(400).json({
            success: false,
            error: 'Validation error',
            details: error.details.map(d => d.message)
        });
    }
    next();
};

export const validateViolation = (req, res, next) => {
    const { error } = violationSchema.validate(req.body);
    if (error) {
        return res.status(400).json({
            success: false,
            error: 'Validation error',
            details: error.details.map(d => d.message)
        });
    }
    next();
};

// Additional validation helpers
export const validateEmail = (email) => {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
};

export const validatePhoneNumber = (phone) => {
    const phoneRegex = /^\+?[1-9]\d{1,14}$/;
    return phoneRegex.test(phone);
};

export const validateIPAddress = (ip) => {
    const ipv4Regex = /^(\d{1,3}\.){3}\d{1,3}$/;
    const ipv6Regex = /^([\da-f]{1,4}:){7}[\da-f]{1,4}$/i;
    return ipv4Regex.test(ip) || ipv6Regex.test(ip);
};

export const validateDateRange = (startDate, endDate) => {
    const start = new Date(startDate);
    const end = new Date(endDate);
    return start <= end && start <= new Date();
};

export const validateRegulation = (regulation, country) => {
    const regulationMap = {
        gdpr: ['AT', 'BE', 'BG', 'HR', 'CY', 'CZ', 'DK', 'EE', 'FI', 'FR', 'DE', 'GR', 
               'HU', 'IE', 'IT', 'LV', 'LT', 'LU', 'MT', 'NL', 'PL', 'PT', 'RO', 'SK', 
               'SI', 'ES', 'SE', 'GB', 'IS', 'LI', 'NO'],
        ccpa: ['US-CA'],
        lgpd: ['BR']
    };

    if (!regulationMap[regulation]) return false;
    
    if (regulation === 'ccpa' && country === 'US') {
        // CCPA only applies to California
        return true;
    }
    
    return regulationMap[regulation].includes(country);
};

// Sanitization helpers
export const sanitizeInput = (input) => {
    if (typeof input !== 'string') return input;
    
    // Remove potential XSS vectors
    return input
        .replace(/[<>]/g, '')
        .replace(/javascript:/gi, '')
        .replace(/on\w+=/gi, '')
        .trim();
};

export const sanitizeObject = (obj) => {
    const sanitized = {};
    
    for (const [key, value] of Object.entries(obj)) {
        if (typeof value === 'string') {
            sanitized[key] = sanitizeInput(value);
        } else if (typeof value === 'object' && value !== null) {
            sanitized[key] = Array.isArray(value) 
                ? value.map(item => typeof item === 'string' ? sanitizeInput(item) : item)
                : sanitizeObject(value);
        } else {
            sanitized[key] = value;
        }
    }
    
    return sanitized;
};