/*
 * Copyright 2010 Louis Lenders
 * Copyright 2010 Detlef Riekenberg
 *
 * 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 "config.h"

#include <stdarg.h>

#include "windef.h"
#include "winbase.h"
#include "winreg.h"
#include "werapi.h"
#include "wine/list.h"
#include "wine/unicode.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(wer);

typedef struct {
    struct list entry;
    WER_REPORT_INFORMATION info;
    WER_REPORT_TYPE reporttype;
    WCHAR eventtype[1];
} report_t;


static CRITICAL_SECTION report_table_cs;
static CRITICAL_SECTION_DEBUG report_table_cs_debug =
{
    0, 0, &report_table_cs,
    { &report_table_cs_debug.ProcessLocksList, &report_table_cs_debug.ProcessLocksList },
      0, 0, { (DWORD_PTR)(__FILE__ ": report_table_cs") }
};
static CRITICAL_SECTION report_table_cs = { &report_table_cs_debug, -1, 0, 0, 0, 0 };

static struct list report_table = LIST_INIT(report_table);

static WCHAR regpath_exclude[] = {'S','o','f','t','w','a','r','e','\\',
                                  'M','i','c','r','o','s','o','f','t','\\',
                                  'W','i','n','d','o','w','s',' ','E','r','r','o','r',' ','R','e','p','o','r','t','i','n','g','\\',
                                  'E','x','c','l','u','d','e','d','A','p','p','l','i','c','a','t','i','o','n','s',0};

/***********************************************************************
 * Memory alloccation helper
 */

static inline void * __WINE_ALLOC_SIZE(1) heap_alloc_zero(size_t len)
{
    return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, len);
}

static inline BOOL heap_free(void *mem)
{
    return HeapFree(GetProcessHeap(), 0, mem);
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
    TRACE("(0x%p, %d, %p)\n", hinstDLL, fdwReason, lpvReserved);

    switch (fdwReason)
    {
        case DLL_WINE_PREATTACH:
            return FALSE;    /* prefer native version */
        case DLL_PROCESS_ATTACH:
            DisableThreadLibraryCalls(hinstDLL);
            break;
        case DLL_PROCESS_DETACH:
            break;
    }

    return TRUE;
}

/***********************************************************************
 * WerAddExcludedApplication (wer.@)
 *
 * Add an application to the user specific or the system wide exclusion list
 *
 * PARAMS
 *  exeName  [i] The application name
 *  allUsers [i] for all users (TRUE) or for the current user (FALSE)
 *
 * RETURNS
 *  Success: S_OK
 *  Faulure: A HRESULT error code
 *
 */
HRESULT WINAPI WerAddExcludedApplication(PCWSTR exeName, BOOL allUsers)
{
    HKEY hkey;
    DWORD value = 1;
    LPWSTR bs;

    TRACE("(%s, %d)\n",debugstr_w(exeName), allUsers);
    if (!exeName || !exeName[0])
        return E_INVALIDARG;

    bs = strrchrW(exeName, '\\');
    if (bs) {
        bs++;   /* skip the backslash */
        if (!bs[0]) {
            return E_INVALIDARG;
        }
    } else
        bs = (LPWSTR) exeName;

    if (!RegCreateKeyW(allUsers ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER, regpath_exclude, &hkey)) {
        RegSetValueExW(hkey, bs, 0, REG_DWORD, (LPBYTE)&value, sizeof(DWORD));
        RegCloseKey(hkey);
        return S_OK;
    }
    return E_ACCESSDENIED;
}

/***********************************************************************
 * WerRemoveExcludedApplication (wer.@)
 *
 * remove an application from the exclusion list
 *
 * PARAMS
 *  exeName  [i] The application name
 *  allUsers [i] for all users (TRUE) or for the current user (FALSE)
 *
 * RETURNS
 *  Success: S_OK
 *  Faulure: A HRESULT error code
 *
 */
HRESULT WINAPI WerRemoveExcludedApplication(PCWSTR exeName, BOOL allUsers)
{
    HKEY hkey;
    LPWSTR bs;
    LONG lres;

    TRACE("(%s, %d)\n",debugstr_w(exeName), allUsers);
    if (!exeName || !exeName[0])
        return E_INVALIDARG;

    bs = strrchrW(exeName, '\\');
    if (bs) {
        bs++;   /* skip the backslash */
        if (!bs[0]) {
            return E_INVALIDARG;
        }
    } else
        bs = (LPWSTR) exeName;

    if (!RegCreateKeyW(allUsers ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER, regpath_exclude, &hkey)) {
        lres = RegDeleteValueW(hkey, bs);
        RegCloseKey(hkey);
        return lres ? __HRESULT_FROM_WIN32(ERROR_ENVVAR_NOT_FOUND) : S_OK;
    }
    return E_ACCESSDENIED;
}

/***********************************************************************
 * WerReportCloseHandle (wer.@)
 *
 * Close an error reporting handle and free associated resources
 *
 * PARAMS
 *  hreport [i] error reporting handle to close
 *
 * RETURNS
 *  Success: S_OK
 *  Failure: A HRESULT error code
 *
 */
HRESULT WINAPI WerReportCloseHandle(HREPORT hreport)
{
    report_t * report = (report_t *) hreport;
    report_t * cursor;
    BOOL found = FALSE;

    TRACE("(%p)\n", hreport);
    EnterCriticalSection(&report_table_cs);
    if (report) {
        LIST_FOR_EACH_ENTRY(cursor, &report_table, report_t, entry)
        {
            if (cursor == report) {
                found = TRUE;
                list_remove(&report->entry);
                break;
            }
        }
    }
    LeaveCriticalSection(&report_table_cs);
    if (!found)
        return E_INVALIDARG;

    heap_free(report);

    return S_OK;
}

/***********************************************************************
 * WerReportCreate (wer.@)
 *
 * Create an error report in memory and return a related HANDLE
 *
 * PARAMS
 *  eventtype  [i] a name for the event type
 *  reporttype [i] what type of report should be created
 *  reportinfo [i] NULL or a ptr to a struct with some detailed information
 *  phandle    [o] ptr, where the resulting handle should be saved
 *
 * RETURNS
 *  Success: S_OK
 *  Failure: A HRESULT error code
 *
 * NOTES
 *  The event type must be registered at microsoft. Predefined types are
 *  "APPCRASH" as the default on Windows, "Crash32" and "Crash64"
 *
 */
HRESULT WINAPI WerReportCreate(PCWSTR eventtype, WER_REPORT_TYPE reporttype, PWER_REPORT_INFORMATION reportinfo, HREPORT *phandle)
{
    report_t *report;
    DWORD len;

    TRACE("(%s, %d, %p, %p)\n", debugstr_w(eventtype), reporttype, reportinfo, phandle);
    if (reportinfo) {
        TRACE(".wzFriendlyEventName: %s\n", debugstr_w(reportinfo->wzFriendlyEventName));
        TRACE(".wzApplicationName: %s\n", debugstr_w(reportinfo->wzApplicationName));
    }

    if (phandle)  *phandle = NULL;
    if (!eventtype || !eventtype[0] || !phandle) {
        return E_INVALIDARG;
    }

    len = lstrlenW(eventtype) + 1;

    report = heap_alloc_zero(len * sizeof(WCHAR) + sizeof(report_t));
    if (!report)
        return __HRESULT_FROM_WIN32(ERROR_OUTOFMEMORY);

    lstrcpyW(report->eventtype, eventtype);
    report->reporttype = reporttype;

    if (reportinfo) {
        report->info = *reportinfo;
    } else {
        FIXME("build report information from scratch for %p\n", report);
    }

    EnterCriticalSection(&report_table_cs);
    list_add_head(&report_table, &report->entry);
    LeaveCriticalSection(&report_table_cs);

    *phandle = report;
    TRACE("=> %p\n", report);
    return S_OK;
}

/***********************************************************************
 * WerReportSetParameter (wer.@)
 *
 * Set one of 10 parameter / value pairs for a report handle
 *
 * PARAMS
 *  hreport [i] error reporting handle to add the parameter
 *  id      [i] parameter to set (WER_P0 up to WER_P9)
 *  name    [i] optional name of the parameter
 *  value   [i] value of the parameter
 *
 * RETURNS
 *  Success: S_OK
 *  Failure: A HRESULT error code
 *
 */
HRESULT WINAPI WerReportSetParameter(HREPORT hreport, DWORD id, PCWSTR name, PCWSTR value)
{
    FIXME("(%p, %d, %s, %s) :stub\n", hreport, id, debugstr_w(name), debugstr_w(value));

    return E_NOTIMPL;
}

/***********************************************************************
 * WerReportSubmit (wer.@)
 *
 * Ask the user for permission and send the error report
 * then kill or restart the application, when requested
 *
 * PARAMS
 *  hreport [i] error reporting handle to send
 *  consent [i] current transmit permission
 *  flags   [i] flag to select dialog, transmission snd restart options
 *  presult [o] ptr, where the transmission result should be saved
 *
 * RETURNS
 *  Success: S_OK
 *  Failure: A HRESULT error code
 *
 */
HRESULT WINAPI WerReportSubmit(HREPORT hreport, WER_CONSENT consent, DWORD flags, PWER_SUBMIT_RESULT presult)
{
    FIXME("(%p, %d, 0x%x, %p) :stub\n", hreport, consent, flags, presult);

    if(!presult)
        return E_INVALIDARG;

    *presult = WerDisabled;
    return E_NOTIMPL;
}