/*
    * main.cpp
    * libdialogs entry point for shared modal dialogs
    * Copyright (c) 2026 Daniel Hammer
*/

#include <montauk/syscall.h>
#include <montauk/string.h>
#include <montauk/heap.h>
#include <gui/gui.hpp>
#include <gui/standalone.hpp>
#include <gui/font.hpp>
#include <gui/dialogs.hpp>

#include "main.hpp"
#include "filedialog.hpp"
#include "printdialog.hpp"
#include "messagebox.hpp"

using namespace gui;
namespace dlg = gui::dialogs;

#define DIALOGS_EXPORT extern "C" __attribute__((visibility("default")))

AppState g_app = {};
static bool g_fonts_ready = false;

// WinEvent::type values (from Api/Syscall.hpp)
static constexpr uint8_t WIN_KEY    = 0;
static constexpr uint8_t WIN_MOUSE  = 1;
static constexpr uint8_t WIN_RESIZE = 2;
static constexpr uint8_t WIN_CLOSE  = 3;
static constexpr uint8_t WIN_SCALE  = 4;

struct DialogCallbacks {
    void (*draw)();
    void (*on_close)();
    void (*handle_mouse)(const montauk::abi::WinEvent& ev);
    void (*handle_key)(const montauk::abi::KeyEvent& key);
};

static void run_dialog_loop(const DialogCallbacks& cb) {
    while (g_app.running) {
        cb.draw();
        g_app.win.present();

        montauk::abi::WinEvent ev;
        int rc = g_app.win.poll(&ev);
        if (rc < 0) { cb.on_close(); break; }
        if (rc == 0) { montauk::sleep_ms(16); continue; }

        if (ev.type == WIN_CLOSE) { cb.on_close(); break; }
        if (ev.type == WIN_MOUSE) { cb.handle_mouse(ev); continue; }
        if (ev.type == WIN_KEY)   { cb.handle_key(ev.key); }
        // WIN_RESIZE and WIN_SCALE are handled inside WsWindow::poll
    }
}

static void cancel_and_stop() { dialog_cancel(""); }

void dialog_finish(const char* status, const char* path, const char* job_id, const char* message,
                   const char* printer_uri, const char* printer_name, uint32_t copies) {
    gui::dialogs::safe_copy(g_app.result.status, sizeof(g_app.result.status), status);
    gui::dialogs::safe_copy(g_app.result.path, sizeof(g_app.result.path), path);
    gui::dialogs::safe_copy(g_app.result.job_id, sizeof(g_app.result.job_id), job_id);
    gui::dialogs::safe_copy(g_app.result.printer_uri, sizeof(g_app.result.printer_uri), printer_uri);
    gui::dialogs::safe_copy(g_app.result.printer_name, sizeof(g_app.result.printer_name), printer_name);
    g_app.result.copies = copies;
    gui::dialogs::safe_copy(g_app.result.message, sizeof(g_app.result.message), message);
    g_app.running = false;
}

void dialog_cancel(const char* message) {
    dialog_finish("cancel", "", "", message, "", "", 0);
}

void cleanup() {
    if (g_app.is_print) {
        printdialog::cleanup();
    } else if (g_app.is_message) {
        messagebox::cleanup();
    } else {
        filedialog::cleanup();
    }
    g_app.win.destroy();
}

static void set_error_result(dlg::Result* result, const char* message) {
    if (!result) return;
    dlg::reset_result(result);
    dlg::safe_copy(result->status, sizeof(result->status), "error");
    dlg::safe_copy(result->message, sizeof(result->message), message);
}

static bool ensure_fonts(dlg::Result* result) {
    if (g_fonts_ready) return true;
    if (!fonts::init()) {
        if (result)
            set_error_result(result, "failed to initialize dialog fonts");
        return false;
    }
    g_fonts_ready = true;
    return true;
}

DIALOGS_EXPORT bool dialogs_run_request(const dlg::Request* request, dlg::Result* out_result) {
    if (!request || !out_result) return false;

    set_error_result(out_result, "dialog failed");

    if (!ensure_fonts(out_result)) return true;

    if (request->kind != dlg::REQUEST_KIND_FILE &&
        request->kind != dlg::REQUEST_KIND_PRINT) {
        set_error_result(out_result, "unsupported dialog request");
        return true;
    }

    g_app = AppState {};
    g_app.request = *request;
    g_app.running = true;
    dlg::reset_result(&g_app.result);

    g_app.is_print = g_app.request.kind == dlg::REQUEST_KIND_PRINT;

    int init_w = filedialog::FILE_INIT_W;
    int init_h = filedialog::FILE_INIT_H;
    if (g_app.is_print) {
        init_w = printdialog::PRINT_INIT_W;
        init_h = printdialog::PRINT_INIT_H;
    }

    const char* default_title = g_app.is_print ? "Print" : "Open";
    const char* title = g_app.request.title[0] ? g_app.request.title : default_title;

    if (g_app.is_print) printdialog::init(g_app.request);
    else filedialog::init(g_app.request);

    if (!g_app.win.create(title, init_w, init_h)) {
        cleanup();
        set_error_result(out_result, "failed to create dialog window");
        return true;
    }

    void (*draw_fn)()                          = g_app.is_print ? printdialog::draw         : filedialog::draw;
    void (*mouse_fn)(const montauk::abi::WinEvent&) = g_app.is_print ? printdialog::handle_mouse : filedialog::handle_mouse;
    void (*key_fn)(const montauk::abi::KeyEvent&)   = g_app.is_print ? printdialog::handle_key   : filedialog::handle_key;

    draw_fn();
    g_app.win.present();

    run_dialog_loop({ draw_fn, cancel_and_stop, mouse_fn, key_fn });

    cleanup();
    *out_result = g_app.result;
    return true;
}

DIALOGS_EXPORT uint8_t dialogs_message_box(const char* title,
                                       const char* message,
                                       uint8_t buttons) {
    if (!ensure_fonts(nullptr))
        return dlg::MESSAGE_BOX_RESULT_NONE;

    g_app = AppState {};
    g_app.running = true;
    g_app.is_message = true;

    const char* window_title = title && title[0] ? title : "Message";
    messagebox::init(message ? message : "", buttons);

    int init_w = 0;
    int init_h = 0;
    messagebox::preferred_size(window_title, &init_w, &init_h);

    if (!g_app.win.create(window_title, init_w, init_h)) {
        cleanup();
        return dlg::MESSAGE_BOX_RESULT_NONE;
    }

    messagebox::draw();
    g_app.win.present();

    run_dialog_loop({ messagebox::draw, messagebox::dismiss, messagebox::handle_mouse, messagebox::handle_key });

    uint8_t choice = messagebox::selected_choice();
    cleanup();
    return choice ? choice : (uint8_t)dlg::MESSAGE_BOX_RESULT_NONE;
}