/*
 * w3m Event System Header
 * 
 * This file defines the event handling system for JavaScript integration
 * in w3m. It provides event listener registration, event dispatching,
 * and integration with w3m's existing input handling system.
 */

#ifndef W3M_EVENTS_H
#define W3M_EVENTS_H

#ifdef USE_JAVASCRIPT

#include "quickjs/quickjs.h"
#include "w3m_javascript.h"
#include "w3m_dom.h"

/* Forward declarations */
struct _Buffer;
struct _anchor;
struct form_list;

/* Event Types */
typedef enum {
    W3M_EVENT_CLICK,
    W3M_EVENT_SUBMIT,
    W3M_EVENT_LOAD,
    W3M_EVENT_UNLOAD,
    W3M_EVENT_FOCUS,
    W3M_EVENT_BLUR,
    W3M_EVENT_CHANGE,
    W3M_EVENT_KEYPRESS,
    W3M_EVENT_KEYDOWN,
    W3M_EVENT_KEYUP,
    W3M_EVENT_MOUSEOVER,
    W3M_EVENT_MOUSEOUT,
    W3M_EVENT_TYPE_COUNT
} W3MEventType;

/* Event Listener Structure */
typedef struct W3MEventListener {
    W3MEventType type;
    JSValue callback;              /* JavaScript callback function */
    W3MElement *target;           /* Target element */
    int use_capture;              /* Capture phase flag */
    struct W3MEventListener *next; /* Linked list */
} W3MEventListener;

/* Event Object Structure */
typedef struct W3MEvent {
    W3MEventType type;
    const char *type_string;      /* "click", "submit", etc. */
    W3MElement *target;           /* Event target */
    W3MElement *currentTarget;    /* Current target during propagation */
    
    /* Event state */
    int bubbles;
    int cancelable;
    int defaultPrevented;
    int propagationStopped;
    
    /* Event data */
    union {
        struct {
            int button;           /* Mouse button */
            int clientX, clientY; /* Mouse coordinates */
        } mouse;
        
        struct {
            int keyCode;          /* Key code */
            int charCode;         /* Character code */
            int ctrlKey, altKey, shiftKey;
        } keyboard;
        
        struct {
            char *data;           /* Generic data */
        } generic;
    } data;
    
    /* JavaScript object reference */
    JSValue js_event;
} W3MEvent;

/* Event System State */
typedef struct {
    W3MEventListener *listeners[W3M_EVENT_TYPE_COUNT];
    W3MEvent **event_queue;
    int queue_size;
    int queue_capacity;
    int processing_events;
} W3MEventSystem;

/* Event System Management */
W3MEventSystem *w3m_events_create_system(void);
void w3m_events_destroy_system(W3MEventSystem *system);
void w3m_events_process_queue(W3MEventSystem *system, W3MJSContext *ctx);

/* Event Listener Management */
void w3m_events_add_listener(W3MEventSystem *system, W3MElement *target, 
                            const char *type, JSValue callback, int use_capture);
void w3m_events_remove_listener(W3MEventSystem *system, W3MElement *target,
                               const char *type, JSValue callback, int use_capture);
int w3m_events_has_listener(W3MEventSystem *system, W3MElement *target, const char *type);

/* Event Creation and Dispatch */
W3MEvent *w3m_events_create_event(W3MEventType type, W3MElement *target);
void w3m_events_destroy_event(W3MEvent *event);
int w3m_events_dispatch_event(W3MEventSystem *system, W3MJSContext *ctx, W3MEvent *event);

/* Event Type Utilities */
W3MEventType w3m_events_string_to_type(const char *type_string);
const char *w3m_events_type_to_string(W3MEventType type);

/* Integration with w3m Input System */
int w3m_events_handle_click(Buffer *buf, Anchor *anchor);
int w3m_events_handle_form_submit(Buffer *buf, FormList *form);
int w3m_events_handle_key_press(Buffer *buf, int key);
void w3m_events_handle_page_load(Buffer *buf);
void w3m_events_handle_page_unload(Buffer *buf);

/* JavaScript Event API Functions */
JSValue js_addEventListener(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);
JSValue js_removeEventListener(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);
JSValue js_dispatchEvent(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);

/* Event Object JavaScript API */
JSValue js_event_preventDefault(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);
JSValue js_event_stopPropagation(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);
JSValue js_event_get_target(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);
JSValue js_event_get_type(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);

/* Event Creation from JavaScript */
JSValue js_createEvent(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);
JSValue js_Event_constructor(JSContext *ctx, JSValueConst this_val, int argc, JSValueConst *argv);

/* Helper Functions */
void w3m_events_bind_to_js(W3MJSContext *ctx, W3MEventSystem *system);
JSValue w3m_events_event_to_js(W3MJSContext *ctx, W3MEvent *event);
W3MEvent *w3m_events_js_to_event(W3MJSContext *ctx, JSValue val);

#endif /* USE_JAVASCRIPT */

#endif /* W3M_EVENTS_H */