#ifndef ECEX_APP_H
#define ECEX_APP_H

#include "ecex.h"
#include "font.h"

#include <GLFW/glfw3.h>
#include <stddef.h>

#define ECEX_MINIBUFFER_SIZE 256
#define ECEX_PREFIX_SIZE 128

typedef enum app_mode {
    APP_MODE_EDIT = 0,
    APP_MODE_MX = 1,
    APP_MODE_PREFIX = 2,
    APP_MODE_PROMPT = 3,
    APP_MODE_ISEARCH = 4,
} app_mode_t;

typedef struct app {
    ecex_t *ed;
    GLFWwindow *window;

    int width;
    int height;
    int dirty;

    app_mode_t mode;

    char minibuffer[ECEX_MINIBUFFER_SIZE];
    size_t minibuffer_len;

    char message[ECEX_MINIBUFFER_SIZE];

    ecex_prompt_request_t prompt_kind;
    int isearch_backward;
    char isearch_query[ECEX_MINIBUFFER_SIZE];
    size_t isearch_len;
    size_t isearch_origin;
    size_t isearch_match;
    int isearch_has_match;
    char last_search_query[ECEX_MINIBUFFER_SIZE];
    char prompt_label[128];
    char prompt_input[1024];
    size_t prompt_input_len;

    /*
     * File/path prompt completion state for find-file and write-file.
     * prompt_completion_query stores the original typed path/query while
     * prompt_input is temporarily replaced with the selected candidate.
     */
    int prompt_completion_active;
    char prompt_completion_query[1024];
    size_t prompt_completion_index;
    size_t prompt_completion_count;
    char prompt_completion_preview[8][1024];
    size_t prompt_completion_preview_start;
    size_t prompt_completion_preview_count;

    /*
     * M-x completion state.
     * completion_query is the original user query used to build the candidate
     * list. This lets the UI replace the minibuffer with a candidate while
     * Up/Down still cycle through matches for the original query, e.g.
     * "-buffer" -> next-buffer / previous-buffer / end-of-buffer / ...
     */
    int completion_active;
    char completion_query[ECEX_MINIBUFFER_SIZE];
    size_t completion_index;
    size_t completion_count;

    char prefix[ECEX_PREFIX_SIZE];
    size_t prefix_len;

    int current_mods;

    /*
     * GLFW sends key events and text events separately. When a printable
     * key is consumed as part of a command sequence, suppress the matching
     * char_callback so it does not insert into the buffer after the command
     * returns to edit mode.
     */
    int suppress_next_char;

    font_t font;
    char font_path[4096];
} app_t;

void app_init(app_t *app, ecex_t *ed);
void app_set_window(app_t *app, GLFWwindow *window);
void app_install_callbacks(app_t *app);
void app_message(app_t *app, const char *msg);

#endif