#include "common/library.h"
#include "common/io.h"
#include "common/path.h"
#include "common/processing.h"
#include "common/properties.h"
#include "common/windows/unicode.h"
#include "common/windows/registry.h"
#include "common/strutil.h"
#include "detection/terminalshell/terminalshell.h"
#include "terminalfont.h"

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

static const char* detectWTProfile(yyjson_val* profile, FFstrbuf* name, double* size) {
    yyjson_val* font = yyjson_obj_get(profile, "font");
    if (!font) {
        return "yyjson_obj_get(profile, \"font\"); failed";
    }

    if (!yyjson_is_obj(font)) {
        return "yyjson_is_obj(font) returns false";
    }

    if (name->length == 0) {
        ffStrbufAppendJsonVal(name, yyjson_obj_get(font, "face"));
    }

    if (*size < 0) {
        yyjson_val* psize = yyjson_obj_get(font, "size");
        if (yyjson_is_num(psize)) {
            *size = unsafe_yyjson_get_num(psize);
        }
    }
    return NULL;
}

static inline void wrapYyjsonFree(yyjson_doc** doc) {
    assert(doc);
    if (*doc) {
        yyjson_doc_free(*doc);
    }
}

static const char* detectFromWTImpl(FFstrbuf* content, FFstrbuf* name, double* size) {
    yyjson_doc* FF_A_CLEANUP(wrapYyjsonFree) doc = yyjson_read_opts(content->chars, content->length, YYJSON_READ_ALLOW_COMMENTS | YYJSON_READ_ALLOW_TRAILING_COMMAS, NULL, NULL);
    if (!doc) {
        return "Failed to parse WT JSON config file";
    }

    yyjson_val* const root = yyjson_doc_get_root(doc);
    assert(root);

    yyjson_val* profiles = yyjson_obj_get(root, "profiles");
    if (!profiles) {
        return "yyjson_obj_get(root, \"profiles\") failed";
    }

    FF_STRBUF_AUTO_DESTROY wtProfileId = ffStrbufCreateS(getenv("WT_PROFILE_ID"));
    ffStrbufTrim(&wtProfileId, '\'');
    if (wtProfileId.length > 0) {
        yyjson_val* list = yyjson_obj_get(profiles, "list");
        if (yyjson_is_arr(list)) {
            yyjson_val* profile;
            size_t idx, max;
            yyjson_arr_foreach (list, idx, max, profile) {
                yyjson_val* guid = yyjson_obj_get(profile, "guid");

                if (ffStrbufEqualS(&wtProfileId, yyjson_get_str(guid))) {
                    detectWTProfile(profile, name, size);
                    break;
                }
            }
        }
    }

    yyjson_val* defaults = yyjson_obj_get(profiles, "defaults");
    if (defaults) {
        detectWTProfile(defaults, name, size);
    }

    if (name->length == 0) {
        ffStrbufSetS(name, "Cascadia Mono");
    }
    if (*size < 0) {
        *size = 12;
    }
    return NULL;
}

static void detectFromWindowsTerminal(const FFstrbuf* terminalExe, FFTerminalFontResult* terminalFont) {
    // https://learn.microsoft.com/en-us/windows/terminal/install#settings-json-file
    FF_STRBUF_AUTO_DESTROY json = ffStrbufCreate();
    const char* error = NULL;

    if (terminalExe && ffIsAbsolutePath(terminalExe->chars)) {
        FF_STRBUF_AUTO_DESTROY jsonPath = ffStrbufCreateA(MAX_PATH);
        ffStrbufAppendNS(&jsonPath, ffStrbufLastIndexC(terminalExe, '\\') + 1, terminalExe->chars);
        ffStrbufAppendS(&jsonPath, ".portable");

        if (ffPathExists(jsonPath.chars, FF_PATHTYPE_ANY)) {
            ffStrbufSubstrBefore(&jsonPath, jsonPath.length - strlen(".portable"));
            ffStrbufAppendS(&jsonPath, "settings\\settings.json");
            if (!ffAppendFileBuffer(jsonPath.chars, &json)) {
                error = "Error reading Windows Terminal portable settings JSON file";
            }
        } else {
            PWSTR localAppDataW = NULL;
            if (SUCCEEDED(SHGetKnownFolderPath(&FOLDERID_LocalAppData, KF_FLAG_DEFAULT, NULL, &localAppDataW))) {
                ffStrbufSetWS(&jsonPath, localAppDataW);
                CoTaskMemFree(localAppDataW);

                if (ffStrbufContainIgnCaseS(terminalExe, "_8wekyb3d8bbwe\\")) {
                    // Microsoft Store version
                    if (ffStrbufContainIgnCaseS(terminalExe, ".WindowsTerminalPreview_")) {
                        // Preview version
                        ffStrbufAppendS(&jsonPath, "\\Packages\\Microsoft.WindowsTerminalPreview_8wekyb3d8bbwe\\LocalState\\settings.json");
                        if (!ffAppendFileBuffer(jsonPath.chars, &json)) {
                            error = "Error reading Windows Terminal Preview settings JSON file";
                        }
                    } else {
                        // Stable version
                        ffStrbufAppendS(&jsonPath, "\\Packages\\Microsoft.WindowsTerminal_8wekyb3d8bbwe\\LocalState\\settings.json");
                        if (!ffAppendFileBuffer(jsonPath.chars, &json)) {
                            error = "Error reading Windows Terminal settings JSON file";
                        }
                    }
                } else {
                    ffStrbufAppendS(&jsonPath, "\\Microsoft\\Windows Terminal\\settings.json");
                    if (!ffAppendFileBuffer(jsonPath.chars, &json)) {
                        error = "Error reading Windows Terminal settings JSON file";
                    }
                }
            }
        }
    }

    if (!error && json.length == 0) {
        error = ffProcessAppendStdOut(&json, (char* const[]) { "cmd.exe", "/c",
                                                 // print the file content directly, so we don't need to handle the difference of Windows and POSIX path
                                                 "if exist %LOCALAPPDATA%\\Packages\\Microsoft.WindowsTerminal_8wekyb3d8bbwe\\LocalState\\settings.json "
                                                 "( type %LOCALAPPDATA%\\Packages\\Microsoft.WindowsTerminal_8wekyb3d8bbwe\\LocalState\\settings.json ) "
                                                 "else if exist %LOCALAPPDATA%\\Packages\\Microsoft.WindowsTerminalPreview_8wekyb3d8bbwe\\LocalState\\settings.json "
                                                 "( type %LOCALAPPDATA%\\Packages\\Microsoft.WindowsTerminalPreview_8wekyb3d8bbwe\\LocalState\\settings.json ) "
                                                 "else if exist \"%LOCALAPPDATA%\\Microsoft\\Windows Terminal\\settings.json\" "
                                                 "( type %LOCALAPPDATA%\\Microsoft\\Windows Terminal\\settings.json ) "
                                                 "else ( call )",
                                                 NULL });
    }

    if (error) {
        ffStrbufAppendS(&terminalFont->error, error);
        return;
    }
    ffStrbufTrimRight(&json, '\n');
    if (json.length == 0) {
        ffStrbufAppendS(&terminalFont->error, "Cannot find file \"settings.json\"");
        return;
    }

    FF_STRBUF_AUTO_DESTROY name = ffStrbufCreate();
    double size = -1;
    error = detectFromWTImpl(&json, &name, &size);

    if (error) {
        ffStrbufAppendS(&terminalFont->error, error);
    } else {
        char sizeStr[16];
        snprintf(sizeStr, ARRAY_SIZE(sizeStr), "%g", size);
        ffFontInitValues(&terminalFont->font, name.chars, sizeStr);
    }
}

static void detectMintty(FFTerminalFontResult* terminalFont) {
    FF_STRBUF_AUTO_DESTROY fontName = ffStrbufCreate();
    FF_STRBUF_AUTO_DESTROY fontSize = ffStrbufCreate();

    if (!ffParsePropFileConfigValues("mintty/config", 2, (FFpropquery[]) { { "Font=", &fontName }, { "FontHeight=", &fontSize } })) {
        ffParsePropFileConfigValues(".minttyrc", 2, (FFpropquery[]) { { "Font=", &fontName }, { "FontHeight=", &fontSize } });
    }
    if (fontName.length == 0) {
        ffStrbufAppendS(&fontName, "Lucida Console");
    }
    if (fontSize.length == 0) {
        ffStrbufAppendC(&fontSize, '9');
    }

    ffFontInitValues(&terminalFont->font, fontName.chars, fontSize.chars);
}

static void detectConhost(FFTerminalFontResult* terminalFont) {
    CONSOLE_FONT_INFOEX cfi = { .cbSize = sizeof(cfi) };
    if (!GetCurrentConsoleFontEx(GetStdHandle(STD_OUTPUT_HANDLE), FALSE, &cfi)) {
        ffStrbufAppendS(&terminalFont->error, "GetCurrentConsoleFontEx() failed");
        return;
    }

    FF_STRBUF_AUTO_DESTROY fontName = ffStrbufCreateWS(cfi.FaceName);

    char fontSize[16];
    _ultoa((unsigned long) (cfi.dwFontSize.Y), fontSize, 10);

    ffFontInitValues(&terminalFont->font, fontName.chars, fontSize);
}

static void detectConEmu(FFTerminalFontResult* terminalFont) {
    // https://conemu.github.io/en/ConEmuXml.html#search-sequence
    FF_STRBUF_AUTO_DESTROY path = ffStrbufCreate();
    FF_STRBUF_AUTO_DESTROY fontName = ffStrbufCreate();
    FF_STRBUF_AUTO_DESTROY fontSize = ffStrbufCreate();

    const char* paths[] = { "ConEmuDir", "ConEmuBaseDir", "APPDATA" };
    for (uint32_t i = 0; i < ARRAY_SIZE(paths); ++i) {
        ffStrbufSetS(&path, getenv(paths[i]));
        if (path.length > 0) {
            ffStrbufAppendS(&path, "/ConEmu.xml");
            if (ffParsePropFileValues(path.chars, 2, (FFpropquery[]) { { "<value name=\"FontName\" type=\"string\" data=\"", &fontName }, { "<value name=\"FontSize\" type=\"ulong\" data=\"", &fontSize } })) {
                break;
            }
        }
    }

    if (fontName.length == 0 && fontSize.length == 0) {
        ffStrbufAppendS(&terminalFont->error, "Failed to parse ConEmu.xml");
        return;
    }

    if (fontName.length > 0) {
        ffStrbufSubstrBeforeLastC(&fontName, '"');
    } else {
        ffStrbufAppendS(&fontName, "Consola");
    }

    if (fontSize.length > 0) {
        ffStrbufSubstrBeforeLastC(&fontSize, '"');
    } else {
        ffStrbufAppendS(&fontSize, "14");
    }

    ffFontInitValues(&terminalFont->font, fontName.chars, fontSize.chars);
}

static void detectWarp(FFTerminalFontResult* terminalFont) {
    FF_AUTO_CLOSE_FD HANDLE key = NULL;
    if (!ffRegOpenKeyForRead(HKEY_CURRENT_USER, L"Software\\Warp.dev\\Warp", &key, &terminalFont->error)) {
        return;
    }

    FF_STRBUF_AUTO_DESTROY fontName = ffStrbufCreate();
    FF_STRBUF_AUTO_DESTROY fontSize = ffStrbufCreate();
    if (ffRegReadValues(key, 2, (FFRegValueArg[]) { FF_ARG(fontName, L"FontName"), FF_ARG(fontSize, L"FontSize") }, &terminalFont->error)) {
        ffStrbufTrim(&fontName, '"');
        ffStrbufAppendS(&fontSize, "px");
    } else {
        ffStrbufSetS(&fontName, "Hack");
        ffStrbufSetS(&fontSize, "13.0px");
    }

    ffFontInitValues(&terminalFont->font, fontName.chars, fontSize.chars);

    FFstrbuf* fontWeight = FF_LIST_ADD(FFstrbuf, terminalFont->font.styles);
    ffStrbufInit(fontWeight);
    if (ffRegReadStrbuf(key, L"FontWeight", fontWeight, NULL)) {
        ffStrbufTrim(fontWeight, '"');
    } else {
        ffStrbufSetStatic(fontWeight, "Normal");
    }
}

bool ffDetectTerminalFontPlatform(const FFTerminalResult* terminal, FFTerminalFontResult* terminalFont) {
    if (ffStrbufIgnCaseEqualS(&terminal->processName, "Windows Terminal") ||
        ffStrbufIgnCaseEqualS(&terminal->processName, "WindowsTerminal.exe")) {
        detectFromWindowsTerminal(&terminal->exe, terminalFont);
    } else if (ffStrbufIgnCaseEqualS(&terminal->processName, "mintty")) {
        detectMintty(terminalFont);
    } else if (ffStrbufIgnCaseEqualS(&terminal->processName, "conhost.exe")) {
        detectConhost(terminalFont);
    } else if (ffStrbufStartsWithIgnCaseS(&terminal->processName, "ConEmu")) {
        detectConEmu(terminalFont);
    } else if (ffStrbufStartsWithIgnCaseS(&terminal->processName, "warp")) {
        detectWarp(terminalFont);
    } else {
        return false;
    }
    return true;
}