/*
    * dialogs.hpp
    * Shared dialog request/result structures and client helpers
    * Copyright (c) 2026 Daniel Hammer
*/

#pragma once

#include <cstdint>
#include <montauk/string.h>

#ifndef GUI_DIALOGS_LIBRARY_BUILD
#include <libloader/libloader.h>
#endif

namespace gui::dialogs {

inline constexpr const char* LIBRARY_PATH = "0:/os/dialogs.lib";
inline constexpr const char* RUN_REQUEST_SYMBOL = "dialogs_run_request";
inline constexpr const char* MESSAGE_BOX_SYMBOL = "dialogs_message_box";

enum RequestKind : uint8_t {
    REQUEST_KIND_FILE = 1,
    REQUEST_KIND_PRINT = 2,
};

enum FileDialogMode : uint8_t {
    FILE_DIALOG_OPEN = 1,
    FILE_DIALOG_SAVE = 2,
};

enum PrintDialogMode : uint8_t {
    PRINT_DIALOG_SETUP = 1,
    PRINT_DIALOG_SUBMIT = 2,
};

enum MessageBoxButtons : uint8_t {
    MESSAGE_BOX_OK = 1,
    MESSAGE_BOX_OK_CANCEL = 2,
    MESSAGE_BOX_YES_NO = 3,
    MESSAGE_BOX_YES_NO_CANCEL = 4,
};

enum MessageBoxResult : uint8_t {
    MESSAGE_BOX_RESULT_NONE = 0,
    MESSAGE_BOX_RESULT_OK = 1,
    MESSAGE_BOX_RESULT_CANCEL = 2,
    MESSAGE_BOX_RESULT_YES = 3,
    MESSAGE_BOX_RESULT_NO = 4,
};

struct Request {
    uint8_t kind;
    uint8_t mode;
    char title[96];
    char initial_path[256];
    char suggested_name[128];
    char source_path[256];
    char job_name[128];
    char printer_uri[256];
    uint32_t copies;
};

struct Result {
    char status[16];
    char path[256];
    char job_id[64];
    char printer_uri[256];
    char printer_name[128];
    uint32_t copies;
    char message[160];
};

inline void safe_copy(char* dst, int dst_len, const char* src) {
    if (!dst || dst_len <= 0) return;
    if (!src) src = "";
    montauk::strncpy(dst, src, dst_len - 1);
    dst[dst_len - 1] = '\0';
}

inline void reset_request(Request* req) {
    if (!req) return;
    montauk::memset(req, 0, sizeof(Request));
}

inline void reset_result(Result* res) {
    if (!res) return;
    montauk::memset(res, 0, sizeof(Result));
}

#ifndef GUI_DIALOGS_LIBRARY_BUILD

using RunRequestFn = bool (*)(const Request*, Result*);
using MessageBoxFn = uint8_t (*)(const char*, const char*, uint8_t);

struct Runtime {
    LibHandle* handle;
    RunRequestFn run_request;
    MessageBoxFn message_box;
};

inline Runtime g_runtime = {};

inline bool ensure_handle(char* out_message, int out_message_len) {
    if (g_runtime.handle) return true;
    g_runtime.handle = libloader::dlopen(LIBRARY_PATH);
    if (!g_runtime.handle) {
        if (out_message && out_message_len > 0)
            safe_copy(out_message, out_message_len, "failed to load dialog library");
        return false;
    }
    return true;
}

inline RunRequestFn resolve_run_request(char* out_message, int out_message_len) {
    if (g_runtime.run_request) return g_runtime.run_request;
    if (!ensure_handle(out_message, out_message_len)) return nullptr;
    g_runtime.run_request = (RunRequestFn)libloader::dlsym(g_runtime.handle, RUN_REQUEST_SYMBOL);
    if (!g_runtime.run_request && out_message && out_message_len > 0)
        safe_copy(out_message, out_message_len, "failed to resolve dialog entry point");
    return g_runtime.run_request;
}

inline MessageBoxFn resolve_message_box(char* out_message, int out_message_len) {
    if (g_runtime.message_box) return g_runtime.message_box;
    if (!ensure_handle(out_message, out_message_len)) return nullptr;
    g_runtime.message_box = (MessageBoxFn)libloader::dlsym(g_runtime.handle, MESSAGE_BOX_SYMBOL);
    if (!g_runtime.message_box && out_message && out_message_len > 0)
        safe_copy(out_message, out_message_len, "failed to resolve message box entry point");
    return g_runtime.message_box;
}

inline bool run_request(const Request* req, Result& res, char* out_message, int out_message_len) {
    if (out_message && out_message_len > 0) out_message[0] = '\0';
    if (!req) {
        if (out_message && out_message_len > 0)
            safe_copy(out_message, out_message_len, "invalid dialog request");
        return false;
    }

    RunRequestFn run_fn = resolve_run_request(out_message, out_message_len);
    if (!run_fn) return false;
    if (!run_fn(req, &res)) {
        if (out_message && out_message_len > 0 && !out_message[0])
            safe_copy(out_message, out_message_len, "dialog library invocation failed");
        return false;
    }

    if (out_message && out_message_len > 0)
        safe_copy(out_message, out_message_len, res.message);
    return montauk::streq(res.status, "ok");
}

inline bool open_file(const char* title,
                      const char* initial_path,
                      char* out_path, int out_path_len,
                      char* out_message = nullptr, int out_message_len = 0) {
    Request req = {};
    req.kind = REQUEST_KIND_FILE;
    req.mode = FILE_DIALOG_OPEN;
    safe_copy(req.title, sizeof(req.title), title ? title : "Open");
    safe_copy(req.initial_path, sizeof(req.initial_path), initial_path);

    Result res = {};
    bool ok = run_request(&req, res, out_message, out_message_len);
    if (ok && out_path && out_path_len > 0) safe_copy(out_path, out_path_len, res.path);
    return ok;
}

inline bool save_file(const char* title,
                      const char* initial_path,
                      const char* suggested_name,
                      char* out_path, int out_path_len,
                      char* out_message = nullptr, int out_message_len = 0) {
    Request req = {};
    req.kind = REQUEST_KIND_FILE;
    req.mode = FILE_DIALOG_SAVE;
    safe_copy(req.title, sizeof(req.title), title ? title : "Save");
    safe_copy(req.initial_path, sizeof(req.initial_path), initial_path);
    safe_copy(req.suggested_name, sizeof(req.suggested_name), suggested_name);

    Result res = {};
    bool ok = run_request(&req, res, out_message, out_message_len);
    if (ok && out_path && out_path_len > 0) safe_copy(out_path, out_path_len, res.path);
    return ok;
}

inline bool print_file(const char* title,
                       const char* source_path,
                       const char* job_name,
                       char* out_job_id, int out_job_id_len,
                       char* out_message = nullptr, int out_message_len = 0) {
    Request req = {};
    req.kind = REQUEST_KIND_PRINT;
    req.mode = PRINT_DIALOG_SUBMIT;
    req.copies = 1;
    safe_copy(req.title, sizeof(req.title), title ? title : "Print");
    safe_copy(req.source_path, sizeof(req.source_path), source_path);
    safe_copy(req.job_name, sizeof(req.job_name), job_name);

    Result res = {};
    bool ok = run_request(&req, res, out_message, out_message_len);
    if (ok && out_job_id && out_job_id_len > 0) safe_copy(out_job_id, out_job_id_len, res.job_id);
    return ok;
}

inline bool configure_print(const char* title,
                            const char* initial_printer_uri,
                            const char* job_name,
                            char* out_printer_uri, int out_printer_uri_len,
                            char* out_printer_name, int out_printer_name_len,
                            uint32_t* out_copies = nullptr,
                            char* out_message = nullptr, int out_message_len = 0) {
    Request req = {};
    req.kind = REQUEST_KIND_PRINT;
    req.mode = PRINT_DIALOG_SETUP;
    req.copies = out_copies && *out_copies > 0 ? *out_copies : 1;
    safe_copy(req.title, sizeof(req.title), title ? title : "Print");
    safe_copy(req.job_name, sizeof(req.job_name), job_name ? job_name : "");
    safe_copy(req.printer_uri, sizeof(req.printer_uri), initial_printer_uri);

    Result res = {};
    bool ok = run_request(&req, res, out_message, out_message_len);
    if (ok && out_printer_uri && out_printer_uri_len > 0) safe_copy(out_printer_uri, out_printer_uri_len, res.printer_uri);
    if (ok && out_printer_name && out_printer_name_len > 0) safe_copy(out_printer_name, out_printer_name_len, res.printer_name);
    if (ok && out_copies) *out_copies = res.copies > 0 ? res.copies : 1;
    return ok;
}

inline MessageBoxResult message_box(const char* title,
                                    const char* message,
                                    MessageBoxButtons buttons = MESSAGE_BOX_OK,
                                    char* out_message = nullptr, int out_message_len = 0) {
    if (out_message && out_message_len > 0) out_message[0] = '\0';
    MessageBoxFn fn = resolve_message_box(out_message, out_message_len);
    if (!fn) return MESSAGE_BOX_RESULT_NONE;

    uint8_t result = fn(title ? title : "Message",
                        message ? message : "",
                        (uint8_t)buttons);
    if (result == MESSAGE_BOX_RESULT_NONE && out_message && out_message_len > 0 && !out_message[0])
        safe_copy(out_message, out_message_len, "message box invocation failed");
    return (MessageBoxResult)result;
}

#endif

} // namespace gui::dialogs