/**
 * V3 Hooks System - Hook Registry
 *
 * Central registry for managing hook definitions and lifecycle.
 * Provides registration, unregistration, and discovery of hooks.
 *
 * @module v3/shared/hooks/registry
 */
import { HookPriority, } from './types.js';
/**
 * Hook registry implementation
 */
export class HookRegistry {
    hooks = new Map();
    hooksById = new Map();
    hookIdCounter = 0;
    // Statistics tracking
    stats = {
        executions: 0,
        failures: 0,
        totalExecutionTime: 0,
    };
    /**
     * Register a new hook
     *
     * @param event - Hook event type
     * @param handler - Hook handler function
     * @param priority - Hook priority (default: Normal)
     * @param options - Additional hook options
     * @returns Hook ID for later unregistration
     */
    register(event, handler, priority = HookPriority.Normal, options = {}) {
        // Generate unique hook ID
        const id = `hook_${++this.hookIdCounter}_${Date.now()}`;
        // Create hook definition
        const definition = {
            id,
            event,
            handler,
            priority,
            name: options.name,
            enabled: options.enabled ?? true,
            timeout: options.timeout,
            metadata: options.metadata,
        };
        // Add to event-specific list
        let eventHooks = this.hooks.get(event);
        if (!eventHooks) {
            eventHooks = [];
            this.hooks.set(event, eventHooks);
        }
        eventHooks.push(definition);
        // Sort by priority (highest first)
        eventHooks.sort((a, b) => b.priority - a.priority);
        // Add to ID map
        this.hooksById.set(id, definition);
        return id;
    }
    /**
     * Unregister a hook by ID
     *
     * @param hookId - Hook ID to unregister
     * @returns Whether hook was found and removed
     */
    unregister(hookId) {
        const definition = this.hooksById.get(hookId);
        if (!definition) {
            return false;
        }
        // Remove from event-specific list
        const eventHooks = this.hooks.get(definition.event);
        if (eventHooks) {
            const index = eventHooks.findIndex(h => h.id === hookId);
            if (index !== -1) {
                eventHooks.splice(index, 1);
            }
            // Clean up empty arrays
            if (eventHooks.length === 0) {
                this.hooks.delete(definition.event);
            }
        }
        // Remove from ID map
        this.hooksById.delete(hookId);
        return true;
    }
    /**
     * Unregister all hooks for an event
     *
     * @param event - Event type to clear hooks for
     * @returns Number of hooks removed
     */
    unregisterAll(event) {
        if (event) {
            const eventHooks = this.hooks.get(event) || [];
            const count = eventHooks.length;
            // Remove from ID map
            for (const hook of eventHooks) {
                this.hooksById.delete(hook.id);
            }
            // Clear event hooks
            this.hooks.delete(event);
            return count;
        }
        else {
            // Clear all hooks
            const count = this.hooksById.size;
            this.hooks.clear();
            this.hooksById.clear();
            this.hookIdCounter = 0;
            return count;
        }
    }
    /**
     * Get all hooks for a specific event (sorted by priority)
     *
     * @param event - Event type
     * @param includeDisabled - Whether to include disabled hooks
     * @returns Array of hook definitions
     */
    getHandlers(event, includeDisabled = false) {
        const eventHooks = this.hooks.get(event) || [];
        if (includeDisabled) {
            return [...eventHooks];
        }
        return eventHooks.filter(h => h.enabled);
    }
    /**
     * Get a hook by ID
     *
     * @param hookId - Hook ID
     * @returns Hook definition or undefined
     */
    getHook(hookId) {
        return this.hooksById.get(hookId);
    }
    /**
     * Enable a hook
     *
     * @param hookId - Hook ID
     * @returns Whether hook was found and enabled
     */
    enable(hookId) {
        const hook = this.hooksById.get(hookId);
        if (hook) {
            hook.enabled = true;
            return true;
        }
        return false;
    }
    /**
     * Disable a hook
     *
     * @param hookId - Hook ID
     * @returns Whether hook was found and disabled
     */
    disable(hookId) {
        const hook = this.hooksById.get(hookId);
        if (hook) {
            hook.enabled = false;
            return true;
        }
        return false;
    }
    /**
     * List all registered hooks
     *
     * @param filter - Optional filter options
     * @returns Array of hook definitions
     */
    listHooks(filter) {
        let hooks;
        if (filter?.event) {
            hooks = this.hooks.get(filter.event) || [];
        }
        else {
            hooks = Array.from(this.hooksById.values());
        }
        // Apply filters
        if (filter?.enabled !== undefined) {
            hooks = hooks.filter(h => h.enabled === filter.enabled);
        }
        if (filter?.minPriority !== undefined) {
            const minPriority = filter.minPriority;
            hooks = hooks.filter(h => h.priority >= minPriority);
        }
        return hooks;
    }
    /**
     * Get all event types with registered hooks
     *
     * @returns Array of event types
     */
    getEventTypes() {
        return Array.from(this.hooks.keys());
    }
    /**
     * Get count of hooks for an event
     *
     * @param event - Event type (optional)
     * @returns Hook count
     */
    count(event) {
        if (event) {
            return this.hooks.get(event)?.length || 0;
        }
        return this.hooksById.size;
    }
    /**
     * Record hook execution statistics
     *
     * @param success - Whether execution succeeded
     * @param executionTime - Execution time in ms
     */
    recordExecution(success, executionTime) {
        this.stats.executions++;
        this.stats.totalExecutionTime += executionTime;
        if (!success) {
            this.stats.failures++;
        }
    }
    /**
     * Get hook statistics
     *
     * @returns Hook statistics
     */
    getStats() {
        const byEvent = {};
        for (const [event, hooks] of this.hooks) {
            byEvent[event] = hooks.filter(h => h.enabled).length;
        }
        return {
            totalHooks: this.hooksById.size,
            byEvent,
            totalExecutions: this.stats.executions,
            totalFailures: this.stats.failures,
            avgExecutionTime: this.stats.executions > 0
                ? this.stats.totalExecutionTime / this.stats.executions
                : 0,
            totalExecutionTime: this.stats.totalExecutionTime,
        };
    }
    /**
     * Reset statistics
     */
    resetStats() {
        this.stats = {
            executions: 0,
            failures: 0,
            totalExecutionTime: 0,
        };
    }
    /**
     * Check if a hook exists
     *
     * @param hookId - Hook ID
     * @returns Whether hook exists
     */
    has(hookId) {
        return this.hooksById.has(hookId);
    }
    /**
     * Clear all hooks and reset state
     */
    clear() {
        this.hooks.clear();
        this.hooksById.clear();
        this.hookIdCounter = 0;
        this.resetStats();
    }
}
/**
 * Create a new hook registry
 */
export function createHookRegistry() {
    return new HookRegistry();
}
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