/*
 * Wordpad implementation - Registry functions
 *
 * Copyright 2007 by Alexander N. Sørnes <alex@thehandofagony.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <windows.h>
#include <shlobj.h>
#include <richedit.h>

#include "wordpad.h"

static const WCHAR key_recentfiles[] = {'R','e','c','e','n','t',' ','f','i','l','e',
                                        ' ','l','i','s','t',0};
static const WCHAR key_options[] = {'O','p','t','i','o','n','s',0};
static const WCHAR key_rtf[] = {'R','T','F',0};
static const WCHAR key_text[] = {'T','e','x','t',0};

static const WCHAR var_file[] = {'F','i','l','e','%','d',0};
static const WCHAR var_framerect[] = {'F','r','a','m','e','R','e','c','t',0};
static const WCHAR var_barstate0[] = {'B','a','r','S','t','a','t','e','0',0};

static LRESULT registry_get_handle(HKEY *hKey, LPDWORD action, LPCWSTR subKey)
{
    LONG ret;
    static const WCHAR wszProgramKey[] = {'S','o','f','t','w','a','r','e','\\',
        'M','i','c','r','o','s','o','f','t','\\',
        'W','i','n','d','o','w','s','\\',
        'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
        'A','p','p','l','e','t','s','\\',
        'W','o','r','d','p','a','d',0};
        LPWSTR key = (LPWSTR)wszProgramKey;

        if(subKey)
        {
            WCHAR backslash[] = {'\\',0};
            key = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
                            (lstrlenW(wszProgramKey)+lstrlenW(subKey)+lstrlenW(backslash)+1)
                                    *sizeof(WCHAR));

            if(!key)
                return 1;

            lstrcpyW(key, wszProgramKey);
            lstrcatW(key, backslash);
            lstrcatW(key, subKey);
        }

        if(action)
        {
            ret = RegCreateKeyExW(HKEY_CURRENT_USER, key, 0, NULL, REG_OPTION_NON_VOLATILE,
                                  KEY_READ | KEY_WRITE, NULL, hKey, action);
        } else
        {
            ret = RegOpenKeyExW(HKEY_CURRENT_USER, key, 0, KEY_READ | KEY_WRITE, hKey);
        }

        if(subKey)
            HeapFree(GetProcessHeap(), 0, key);

        return ret;
}

void registry_set_options(HWND hMainWnd)
{
    HKEY hKey;
    DWORD action;

    if(registry_get_handle(&hKey, &action, (LPWSTR)key_options) == ERROR_SUCCESS)
    {
        RECT rc;

        GetWindowRect(hMainWnd, &rc);

        RegSetValueExW(hKey, var_framerect, 0, REG_BINARY, (LPBYTE)&rc, sizeof(RECT));

        registry_set_pagemargins(hKey);
    }

    RegCloseKey(hKey);
}

void registry_read_winrect(RECT* rc)
{
    HKEY hKey;
    DWORD size = sizeof(RECT);

    if(registry_get_handle(&hKey, 0, (LPWSTR)key_options) != ERROR_SUCCESS ||
       RegQueryValueExW(hKey, var_framerect, 0, NULL, (LPBYTE)rc, &size) !=
       ERROR_SUCCESS || size != sizeof(RECT))
    {
        rc->top = 0;
        rc->left = 0;
        rc->bottom = 300;
        rc->right = 600;
    }

    RegCloseKey(hKey);
}

static void truncate_path(LPWSTR file, LPWSTR out, LPWSTR pos1, LPWSTR pos2)
{
    static const WCHAR dots[] = {'.','.','.',0};

    *++pos1 = 0;

    lstrcatW(out, file);
    lstrcatW(out, dots);
    lstrcatW(out, pos2);
}

static void format_filelist_filename(LPWSTR file, LPWSTR out)
{
    LPWSTR pos_basename;
    LPWSTR truncpos1, truncpos2;
    WCHAR myDocs[MAX_STRING_LEN];

    SHGetFolderPathW(NULL, CSIDL_PERSONAL, NULL, SHGFP_TYPE_CURRENT, (LPWSTR)&myDocs);
    pos_basename = file_basename(file);
    truncpos1 = NULL;
    truncpos2 = NULL;

    *(pos_basename-1) = 0;
    if(!lstrcmpiW(file, myDocs) || (lstrlenW(pos_basename) > FILELIST_ENTRY_LENGTH))
    {
        truncpos1 = pos_basename;
        *(pos_basename-1) = '\\';
    } else
    {
        LPWSTR pos;
        BOOL morespace = FALSE;

        *(pos_basename-1) = '\\';

        for(pos = file; pos < pos_basename; pos++)
        {
            if(*pos == '\\' || *pos == '/')
            {
                if(truncpos1)
                {
                    if((pos - file + lstrlenW(pos_basename)) > FILELIST_ENTRY_LENGTH)
                        break;

                    truncpos1 = pos;
                    morespace = TRUE;
                    break;
                }

                if((pos - file + lstrlenW(pos_basename)) > FILELIST_ENTRY_LENGTH)
                    break;

                truncpos1 = pos;
            }
        }

        if(morespace)
        {
            for(pos = pos_basename; pos >= truncpos1; pos--)
            {
                if(*pos == '\\' || *pos == '/')
                {
                    if((truncpos1 - file + lstrlenW(pos_basename) + pos_basename - pos) > FILELIST_ENTRY_LENGTH)
                        break;

                    truncpos2 = pos;
                }
            }
        }
    }

    if(truncpos1 == pos_basename)
        lstrcatW(out, pos_basename);
    else if(truncpos1 == truncpos2 || !truncpos2)
        lstrcatW(out, file);
    else
        truncate_path(file, out, truncpos1, truncpos2 ? truncpos2 : (pos_basename-1));
}

void registry_read_filelist(HWND hMainWnd)
{
    HKEY hFileKey;

    if(registry_get_handle(&hFileKey, 0, key_recentfiles) == ERROR_SUCCESS)
    {
        WCHAR itemText[MAX_PATH+3], buffer[MAX_PATH];
        /* The menu item name is not the same as the file name, so we need to store
        the file name here */
        static WCHAR file1[MAX_PATH], file2[MAX_PATH], file3[MAX_PATH], file4[MAX_PATH];
        WCHAR numFormat[] = {'&','%','d',' ',0};
        LPWSTR pFile[] = {file1, file2, file3, file4};
        DWORD pathSize = MAX_PATH*sizeof(WCHAR);
        int i;
        WCHAR key[6];
        MENUITEMINFOW mi;
        HMENU hMenu = GetMenu(hMainWnd);

        mi.cbSize = sizeof(MENUITEMINFOW);
        mi.fMask = MIIM_ID | MIIM_DATA | MIIM_STRING | MIIM_FTYPE;
        mi.fType = MFT_STRING;
        mi.dwTypeData = itemText;
        mi.wID = ID_FILE_RECENT1;

        RemoveMenu(hMenu, ID_FILE_RECENT_SEPARATOR, MF_BYCOMMAND);
        for(i = 0; i < FILELIST_ENTRIES; i++)
        {
            wsprintfW(key, var_file, i+1);
            RemoveMenu(hMenu, ID_FILE_RECENT1+i, MF_BYCOMMAND);
            if(RegQueryValueExW(hFileKey, (LPWSTR)key, 0, NULL, (LPBYTE)pFile[i], &pathSize)
               != ERROR_SUCCESS)
                break;

            mi.dwItemData = (DWORD)pFile[i];
            wsprintfW(itemText, numFormat, i+1);

            lstrcpyW(buffer, pFile[i]);

            format_filelist_filename(buffer, itemText);

            InsertMenuItemW(hMenu, ID_FILE_EXIT, FALSE, &mi);
            mi.wID++;
            pathSize = MAX_PATH*sizeof(WCHAR);
        }
        mi.fType = MFT_SEPARATOR;
        mi.fMask = MIIM_FTYPE | MIIM_ID;
        InsertMenuItemW(hMenu, ID_FILE_EXIT, FALSE, &mi);

        RegCloseKey(hFileKey);
    }
}

void registry_set_filelist(LPCWSTR newFile, HWND hMainWnd)
{
    HKEY hKey;
    DWORD action;

    if(registry_get_handle(&hKey, &action, key_recentfiles) == ERROR_SUCCESS)
    {
        LPCWSTR pFiles[FILELIST_ENTRIES];
        int i;
        HMENU hMenu = GetMenu(hMainWnd);
        MENUITEMINFOW mi;
        WCHAR buffer[6];

        mi.cbSize = sizeof(MENUITEMINFOW);
        mi.fMask = MIIM_DATA;

        for(i = 0; i < FILELIST_ENTRIES; i++)
            pFiles[i] = NULL;

        for(i = 0; GetMenuItemInfoW(hMenu, ID_FILE_RECENT1+i, FALSE, &mi); i++)
            pFiles[i] = (LPWSTR)mi.dwItemData;

        if(lstrcmpiW(newFile, pFiles[0]))
        {
            for(i = 0; pFiles[i] && i < FILELIST_ENTRIES; i++)
            {
                if(!lstrcmpiW(pFiles[i], newFile))
                {
                    int j;
                    for(j = 0; pFiles[j] && j < i; j++)
                    {
                        pFiles[i-j] = pFiles[i-j-1];
                    }
                    pFiles[0] = NULL;
                    break;
                }
            }

            if(!pFiles[0])
            {
                pFiles[0] = newFile;
            } else
            {
                for(i = 0; pFiles[i] && i < FILELIST_ENTRIES-1; i++)
                    pFiles[FILELIST_ENTRIES-1-i] = pFiles[FILELIST_ENTRIES-2-i];

                pFiles[0] = newFile;
            }

            for(i = 0; pFiles[i] && i < FILELIST_ENTRIES; i++)
            {
                wsprintfW(buffer, var_file, i+1);
                RegSetValueExW(hKey, (LPWSTR)&buffer, 0, REG_SZ, (LPBYTE)pFiles[i],
                               (lstrlenW(pFiles[i])+1)*sizeof(WCHAR));
            }
        }
    }
    RegCloseKey(hKey);
    registry_read_filelist(hMainWnd);
}

int reg_formatindex(WPARAM format)
{
    return (format & SF_TEXT) ? 1 : 0;
}

void registry_read_options(void)
{
    HKEY hKey;

    if(registry_get_handle(&hKey, 0, key_options) != ERROR_SUCCESS)
        registry_read_pagemargins(NULL);
    else
        registry_read_pagemargins(hKey);

    RegCloseKey(hKey);
}

static void registry_read_formatopts(int index, LPCWSTR key, DWORD barState[], DWORD wordWrap[])
{
    HKEY hKey;
    DWORD action = 0;
    BOOL fetched = FALSE;
    barState[index] = 0;
    wordWrap[index] = 0;

    if(registry_get_handle(&hKey, &action, key) != ERROR_SUCCESS)
        return;

    if(action == REG_OPENED_EXISTING_KEY)
    {
        DWORD size = sizeof(DWORD);

        if(RegQueryValueExW(hKey, var_barstate0, 0, NULL, (LPBYTE)&barState[index],
           &size) == ERROR_SUCCESS)
            fetched = TRUE;
    }

    if(!fetched)
        barState[index] = (1 << BANDID_TOOLBAR) | (1 << BANDID_FORMATBAR) | (1 << BANDID_RULER) | (1 << BANDID_STATUSBAR);

    if(index == reg_formatindex(SF_RTF))
        wordWrap[index] = ID_WORDWRAP_WINDOW;
    else if(index == reg_formatindex(SF_TEXT))
        wordWrap[index] = ID_WORDWRAP_WINDOW; /* FIXME: should be ID_WORDWRAP_NONE once we support it */

    RegCloseKey(hKey);
}

void registry_read_formatopts_all(DWORD barState[], DWORD wordWrap[])
{
    registry_read_formatopts(reg_formatindex(SF_RTF), key_rtf, barState, wordWrap);
    registry_read_formatopts(reg_formatindex(SF_TEXT), key_text, barState, wordWrap);
}

static void registry_set_formatopts(int index, LPCWSTR key, DWORD barState[])
{
    HKEY hKey;
    DWORD action = 0;

    if(registry_get_handle(&hKey, &action, key) == ERROR_SUCCESS)
    {
        RegSetValueExW(hKey, var_barstate0, 0, REG_DWORD, (LPBYTE)&barState[index],
                       sizeof(DWORD));

        RegCloseKey(hKey);
    }
}

void registry_set_formatopts_all(DWORD barState[])
{
    registry_set_formatopts(reg_formatindex(SF_RTF), key_rtf, barState);
    registry_set_formatopts(reg_formatindex(SF_TEXT), key_text, barState);
}