/**
 * Augmentation Metadata Contract System
 *
 * Prevents accidental metadata corruption while allowing intentional enrichment
 * Each augmentation declares its metadata intentions upfront
 */
/**
 * Runtime metadata safety enforcer
 */
export class MetadataSafetyEnforcer {
    constructor() {
        this.contracts = new Map();
        this.modifications = new Map(); // field -> augmentations that modify it
    }
    /**
     * Register an augmentation's contract
     */
    registerContract(contract) {
        this.contracts.set(contract.name, contract);
        // Track which augmentations modify which fields
        if (contract.writes?.userFields) {
            for (const fieldDef of contract.writes.userFields) {
                if (!this.modifications.has(fieldDef.field)) {
                    this.modifications.set(fieldDef.field, new Set());
                }
                this.modifications.get(fieldDef.field).add(contract.name);
            }
        }
    }
    /**
     * Check if an augmentation can modify a field
     */
    canModifyField(augName, field, value) {
        const contract = this.contracts.get(augName);
        if (!contract) {
            return {
                allowed: false,
                reason: `Augmentation '${augName}' has no registered contract`
            };
        }
        // Check if field is in user namespace
        if (!field.startsWith('_brainy.') && !field.startsWith('_augmentations.')) {
            // It's a user field
            const declaredField = contract.writes?.userFields?.find(f => f.field === field);
            if (!declaredField) {
                return {
                    allowed: false,
                    reason: `Augmentation '${augName}' did not declare intent to modify '${field}'`
                };
            }
            // Check for conflicts
            const modifiers = this.modifications.get(field);
            if (modifiers && modifiers.size > 1) {
                const others = Array.from(modifiers).filter(a => a !== augName);
                return {
                    allowed: true, // Still allowed but with warning
                    warnings: [`Field '${field}' is also modified by: ${others.join(', ')}`]
                };
            }
            return { allowed: true };
        }
        // Check internal fields
        if (field.startsWith('_brainy.')) {
            const internalField = contract.writes?.internalFields?.find(f => field === `_brainy.${f.field}`);
            if (!internalField) {
                return {
                    allowed: false,
                    reason: `Augmentation '${augName}' cannot modify internal field '${field}'`
                };
            }
            if (internalField.permission !== 'granted') {
                return {
                    allowed: false,
                    reason: `Permission not granted for internal field '${field}'`
                };
            }
            return { allowed: true };
        }
        // Check augmentation namespace
        if (field.startsWith('_augmentations.')) {
            const parts = field.split('.');
            const targetAug = parts[1];
            // Can only modify own namespace
            if (targetAug !== augName) {
                return {
                    allowed: false,
                    reason: `Cannot modify another augmentation's namespace: ${targetAug}`
                };
            }
            return { allowed: true };
        }
        return { allowed: true };
    }
    /**
     * Create safe metadata proxy for an augmentation
     */
    createSafeProxy(metadata, augName) {
        const self = this;
        return new Proxy(metadata, {
            set(target, prop, value) {
                const field = String(prop);
                // Check permission
                const permission = self.canModifyField(augName, field, value);
                if (!permission.allowed) {
                    throw new Error(`[${augName}] ${permission.reason}`);
                }
                if (permission.warnings) {
                    console.warn(`[${augName}] Warning:`, ...permission.warnings);
                }
                // Track modification for audit
                if (!target._audit) {
                    target._audit = [];
                }
                target._audit.push({
                    augmentation: augName,
                    field,
                    oldValue: target[prop],
                    newValue: value,
                    timestamp: Date.now()
                });
                target[prop] = value;
                return true;
            },
            deleteProperty(target, prop) {
                const field = String(prop);
                const permission = self.canModifyField(augName, field, undefined);
                if (!permission.allowed) {
                    throw new Error(`[${augName}] Cannot delete field: ${permission.reason}`);
                }
                delete target[prop];
                return true;
            }
        });
    }
}
/**
 * Example augmentation contracts
 */
export const EXAMPLE_CONTRACTS = {
    // Enrichment augmentation that adds categories
    categoryEnricher: {
        name: 'categoryEnricher',
        version: '1.0.0',
        reads: {
            userFields: ['title', 'description', 'content']
        },
        writes: {
            userFields: [
                {
                    field: 'category',
                    type: 'create',
                    description: 'Auto-detected category',
                    example: 'technology'
                },
                {
                    field: 'subcategories',
                    type: 'create',
                    description: 'List of relevant subcategories',
                    example: ['web', 'framework']
                }
            ],
            augmentationFields: [
                {
                    field: 'confidence',
                    description: 'Confidence score of categorization'
                }
            ]
        },
        guarantees: {
            preservesExisting: true,
            idempotent: true
        }
    },
    // Translation augmentation
    translator: {
        name: 'translator',
        version: '1.0.0',
        reads: {
            userFields: ['title', 'description']
        },
        writes: {
            userFields: [
                {
                    field: 'translations',
                    type: 'merge',
                    description: 'Translations in multiple languages',
                    example: { es: 'Título', fr: 'Titre' }
                },
                {
                    field: 'detectedLanguage',
                    type: 'create',
                    description: 'Detected source language',
                    example: 'en'
                }
            ]
        },
        conflictResolution: {
            strategy: 'merge',
            priority: 10
        }
    },
    // Sentiment analyzer
    sentimentAnalyzer: {
        name: 'sentimentAnalyzer',
        version: '1.0.0',
        reads: {
            userFields: ['content', 'description', 'reviews']
        },
        writes: {
            userFields: [
                {
                    field: 'sentiment',
                    type: 'update',
                    description: 'Overall sentiment score',
                    example: { score: 0.8, label: 'positive' }
                }
            ],
            augmentationFields: [
                {
                    field: 'analysis',
                    description: 'Detailed sentiment breakdown'
                }
            ]
        },
        guarantees: {
            reversible: true,
            validatesTypes: true
        }
    },
    // System augmentation with internal access
    garbageCollector: {
        name: 'garbageCollector',
        version: '1.0.0',
        reads: {
            internalFields: ['_brainy.createdAt', '_brainy.lastAccessed']
        },
        writes: {
            internalFields: [
                {
                    field: 'deleted',
                    permission: 'granted',
                    reason: 'Soft delete expired items'
                },
                {
                    field: 'archived',
                    permission: 'granted',
                    reason: 'Archive old items'
                }
            ]
        }
    }
};
/**
 * Augmentation base class with safety
 */
export class SafeAugmentation {
    constructor(contract) {
        this.contract = contract;
        this.enforcer = new MetadataSafetyEnforcer();
        this.enforcer.registerContract(contract);
    }
    /**
     * Get safe metadata proxy
     */
    getSafeMetadata(metadata) {
        return this.enforcer.createSafeProxy(metadata, this.contract.name);
    }
}
/**
 * Example: Category enricher implementation
 */
export class CategoryEnricherAugmentation extends SafeAugmentation {
    constructor() {
        super(EXAMPLE_CONTRACTS.categoryEnricher);
    }
    async execute(metadata) {
        const safe = this.getSafeMetadata(metadata);
        // Read declared fields
        const title = safe.title;
        const description = safe.description;
        // Analyze and categorize
        const category = this.detectCategory(title, description);
        const subcategories = this.detectSubcategories(title, description);
        // Write to declared fields (will be checked by proxy)
        safe.category = category; // ✅ Allowed - declared in contract
        safe.subcategories = subcategories; // ✅ Allowed
        // Try to write undeclared field
        // safe.randomField = 'test' // ❌ Would throw error!
        // Write to our augmentation namespace
        if (!safe._augmentations)
            safe._augmentations = {};
        if (!safe._augmentations.categoryEnricher) {
            safe._augmentations.categoryEnricher = {};
        }
        safe._augmentations.categoryEnricher.confidence = 0.95; // ✅ Allowed
        return safe;
    }
    detectCategory(title, description) {
        // Simplified logic
        return 'technology';
    }
    detectSubcategories(title, description) {
        return ['web', 'framework'];
    }
}
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