/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "ConfigDescription.h"
#include "Locale.h"
#include "SdkConstants.h"
#include "StringPiece.h"
#include "Util.h"

#include <androidfw/ResourceTypes.h>
#include <string>
#include <vector>

namespace aapt {

using android::ResTable_config;

static const char* kWildcardName = "any";

static bool parseMcc(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->mcc = 0;
        return true;
    }
    const char* c = name;
    if (tolower(*c) != 'm') return false;
    c++;
    if (tolower(*c) != 'c') return false;
    c++;
    if (tolower(*c) != 'c') return false;
    c++;

    const char* val = c;

    while (*c >= '0' && *c <= '9') {
        c++;
    }
    if (*c != 0) return false;
    if (c-val != 3) return false;

    int d = atoi(val);
    if (d != 0) {
        if (out) out->mcc = d;
        return true;
    }

    return false;
}

static bool parseMnc(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->mcc = 0;
        return true;
    }
    const char* c = name;
    if (tolower(*c) != 'm') return false;
    c++;
    if (tolower(*c) != 'n') return false;
    c++;
    if (tolower(*c) != 'c') return false;
    c++;

    const char* val = c;

    while (*c >= '0' && *c <= '9') {
        c++;
    }
    if (*c != 0) return false;
    if (c-val == 0 || c-val > 3) return false;

    if (out) {
        out->mnc = atoi(val);
        if (out->mnc == 0) {
            out->mnc = ACONFIGURATION_MNC_ZERO;
        }
    }

    return true;
}

static bool parseLayoutDirection(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_LAYOUTDIR)
                | ResTable_config::LAYOUTDIR_ANY;
        return true;
    } else if (strcmp(name, "ldltr") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_LAYOUTDIR)
                | ResTable_config::LAYOUTDIR_LTR;
        return true;
    } else if (strcmp(name, "ldrtl") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_LAYOUTDIR)
                | ResTable_config::LAYOUTDIR_RTL;
        return true;
    }

    return false;
}

static bool parseScreenLayoutSize(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENSIZE)
                | ResTable_config::SCREENSIZE_ANY;
        return true;
    } else if (strcmp(name, "small") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENSIZE)
                | ResTable_config::SCREENSIZE_SMALL;
        return true;
    } else if (strcmp(name, "normal") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENSIZE)
                | ResTable_config::SCREENSIZE_NORMAL;
        return true;
    } else if (strcmp(name, "large") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENSIZE)
                | ResTable_config::SCREENSIZE_LARGE;
        return true;
    } else if (strcmp(name, "xlarge") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENSIZE)
                | ResTable_config::SCREENSIZE_XLARGE;
        return true;
    }

    return false;
}

static bool parseScreenLayoutLong(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENLONG)
                | ResTable_config::SCREENLONG_ANY;
        return true;
    } else if (strcmp(name, "long") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENLONG)
                | ResTable_config::SCREENLONG_YES;
        return true;
    } else if (strcmp(name, "notlong") == 0) {
        if (out) out->screenLayout =
                (out->screenLayout&~ResTable_config::MASK_SCREENLONG)
                | ResTable_config::SCREENLONG_NO;
        return true;
    }

    return false;
}

static bool parseOrientation(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->orientation = out->ORIENTATION_ANY;
        return true;
    } else if (strcmp(name, "port") == 0) {
        if (out) out->orientation = out->ORIENTATION_PORT;
        return true;
    } else if (strcmp(name, "land") == 0) {
        if (out) out->orientation = out->ORIENTATION_LAND;
        return true;
    } else if (strcmp(name, "square") == 0) {
        if (out) out->orientation = out->ORIENTATION_SQUARE;
        return true;
    }

    return false;
}

static bool parseUiModeType(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->uiMode =
                (out->uiMode&~ResTable_config::MASK_UI_MODE_TYPE)
                | ResTable_config::UI_MODE_TYPE_ANY;
        return true;
    } else if (strcmp(name, "desk") == 0) {
      if (out) out->uiMode =
              (out->uiMode&~ResTable_config::MASK_UI_MODE_TYPE)
              | ResTable_config::UI_MODE_TYPE_DESK;
        return true;
    } else if (strcmp(name, "car") == 0) {
      if (out) out->uiMode =
              (out->uiMode&~ResTable_config::MASK_UI_MODE_TYPE)
              | ResTable_config::UI_MODE_TYPE_CAR;
        return true;
    } else if (strcmp(name, "television") == 0) {
      if (out) out->uiMode =
              (out->uiMode&~ResTable_config::MASK_UI_MODE_TYPE)
              | ResTable_config::UI_MODE_TYPE_TELEVISION;
        return true;
    } else if (strcmp(name, "appliance") == 0) {
      if (out) out->uiMode =
              (out->uiMode&~ResTable_config::MASK_UI_MODE_TYPE)
              | ResTable_config::UI_MODE_TYPE_APPLIANCE;
        return true;
    } else if (strcmp(name, "watch") == 0) {
      if (out) out->uiMode =
              (out->uiMode&~ResTable_config::MASK_UI_MODE_TYPE)
              | ResTable_config::UI_MODE_TYPE_WATCH;
        return true;
    }

    return false;
}

static bool parseUiModeNight(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->uiMode =
                (out->uiMode&~ResTable_config::MASK_UI_MODE_NIGHT)
                | ResTable_config::UI_MODE_NIGHT_ANY;
        return true;
    } else if (strcmp(name, "night") == 0) {
        if (out) out->uiMode =
                (out->uiMode&~ResTable_config::MASK_UI_MODE_NIGHT)
                | ResTable_config::UI_MODE_NIGHT_YES;
        return true;
    } else if (strcmp(name, "notnight") == 0) {
      if (out) out->uiMode =
              (out->uiMode&~ResTable_config::MASK_UI_MODE_NIGHT)
              | ResTable_config::UI_MODE_NIGHT_NO;
        return true;
    }

    return false;
}

static bool parseDensity(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->density = ResTable_config::DENSITY_DEFAULT;
        return true;
    }

    if (strcmp(name, "anydpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_ANY;
        return true;
    }

    if (strcmp(name, "nodpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_NONE;
        return true;
    }

    if (strcmp(name, "ldpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_LOW;
        return true;
    }

    if (strcmp(name, "mdpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_MEDIUM;
        return true;
    }

    if (strcmp(name, "tvdpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_TV;
        return true;
    }

    if (strcmp(name, "hdpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_HIGH;
        return true;
    }

    if (strcmp(name, "xhdpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_XHIGH;
        return true;
    }

    if (strcmp(name, "xxhdpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_XXHIGH;
        return true;
    }

    if (strcmp(name, "xxxhdpi") == 0) {
        if (out) out->density = ResTable_config::DENSITY_XXXHIGH;
        return true;
    }

    char* c = (char*)name;
    while (*c >= '0' && *c <= '9') {
        c++;
    }

    // check that we have 'dpi' after the last digit.
    if (toupper(c[0]) != 'D' ||
            toupper(c[1]) != 'P' ||
            toupper(c[2]) != 'I' ||
            c[3] != 0) {
        return false;
    }

    // temporarily replace the first letter with \0 to
    // use atoi.
    char tmp = c[0];
    c[0] = '\0';

    int d = atoi(name);
    c[0] = tmp;

    if (d != 0) {
        if (out) out->density = d;
        return true;
    }

    return false;
}

static bool parseTouchscreen(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->touchscreen = out->TOUCHSCREEN_ANY;
        return true;
    } else if (strcmp(name, "notouch") == 0) {
        if (out) out->touchscreen = out->TOUCHSCREEN_NOTOUCH;
        return true;
    } else if (strcmp(name, "stylus") == 0) {
        if (out) out->touchscreen = out->TOUCHSCREEN_STYLUS;
        return true;
    } else if (strcmp(name, "finger") == 0) {
        if (out) out->touchscreen = out->TOUCHSCREEN_FINGER;
        return true;
    }

    return false;
}

static bool parseKeysHidden(const char* name, ResTable_config* out) {
    uint8_t mask = 0;
    uint8_t value = 0;
    if (strcmp(name, kWildcardName) == 0) {
        mask = ResTable_config::MASK_KEYSHIDDEN;
        value = ResTable_config::KEYSHIDDEN_ANY;
    } else if (strcmp(name, "keysexposed") == 0) {
        mask = ResTable_config::MASK_KEYSHIDDEN;
        value = ResTable_config::KEYSHIDDEN_NO;
    } else if (strcmp(name, "keyshidden") == 0) {
        mask = ResTable_config::MASK_KEYSHIDDEN;
        value = ResTable_config::KEYSHIDDEN_YES;
    } else if (strcmp(name, "keyssoft") == 0) {
        mask = ResTable_config::MASK_KEYSHIDDEN;
        value = ResTable_config::KEYSHIDDEN_SOFT;
    }

    if (mask != 0) {
        if (out) out->inputFlags = (out->inputFlags&~mask) | value;
        return true;
    }

    return false;
}

static bool parseKeyboard(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->keyboard = out->KEYBOARD_ANY;
        return true;
    } else if (strcmp(name, "nokeys") == 0) {
        if (out) out->keyboard = out->KEYBOARD_NOKEYS;
        return true;
    } else if (strcmp(name, "qwerty") == 0) {
        if (out) out->keyboard = out->KEYBOARD_QWERTY;
        return true;
    } else if (strcmp(name, "12key") == 0) {
        if (out) out->keyboard = out->KEYBOARD_12KEY;
        return true;
    }

    return false;
}

static bool parseNavHidden(const char* name, ResTable_config* out) {
    uint8_t mask = 0;
    uint8_t value = 0;
    if (strcmp(name, kWildcardName) == 0) {
        mask = ResTable_config::MASK_NAVHIDDEN;
        value = ResTable_config::NAVHIDDEN_ANY;
    } else if (strcmp(name, "navexposed") == 0) {
        mask = ResTable_config::MASK_NAVHIDDEN;
        value = ResTable_config::NAVHIDDEN_NO;
    } else if (strcmp(name, "navhidden") == 0) {
        mask = ResTable_config::MASK_NAVHIDDEN;
        value = ResTable_config::NAVHIDDEN_YES;
    }

    if (mask != 0) {
        if (out) out->inputFlags = (out->inputFlags&~mask) | value;
        return true;
    }

    return false;
}

static bool parseNavigation(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) out->navigation = out->NAVIGATION_ANY;
        return true;
    } else if (strcmp(name, "nonav") == 0) {
        if (out) out->navigation = out->NAVIGATION_NONAV;
        return true;
    } else if (strcmp(name, "dpad") == 0) {
        if (out) out->navigation = out->NAVIGATION_DPAD;
        return true;
    } else if (strcmp(name, "trackball") == 0) {
        if (out) out->navigation = out->NAVIGATION_TRACKBALL;
        return true;
    } else if (strcmp(name, "wheel") == 0) {
        if (out) out->navigation = out->NAVIGATION_WHEEL;
        return true;
    }

    return false;
}

static bool parseScreenSize(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) {
            out->screenWidth = out->SCREENWIDTH_ANY;
            out->screenHeight = out->SCREENHEIGHT_ANY;
        }
        return true;
    }

    const char* x = name;
    while (*x >= '0' && *x <= '9') x++;
    if (x == name || *x != 'x') return false;
    std::string xName(name, x-name);
    x++;

    const char* y = x;
    while (*y >= '0' && *y <= '9') y++;
    if (y == name || *y != 0) return false;
    std::string yName(x, y-x);

    uint16_t w = (uint16_t)atoi(xName.c_str());
    uint16_t h = (uint16_t)atoi(yName.c_str());
    if (w < h) {
        return false;
    }

    if (out) {
        out->screenWidth = w;
        out->screenHeight = h;
    }

    return true;
}

static bool parseSmallestScreenWidthDp(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) {
            out->smallestScreenWidthDp = out->SCREENWIDTH_ANY;
        }
        return true;
    }

    if (*name != 's') return false;
    name++;
    if (*name != 'w') return false;
    name++;
    const char* x = name;
    while (*x >= '0' && *x <= '9') x++;
    if (x == name || x[0] != 'd' || x[1] != 'p' || x[2] != 0) return false;
    std::string xName(name, x-name);

    if (out) {
        out->smallestScreenWidthDp = (uint16_t)atoi(xName.c_str());
    }

    return true;
}

static bool parseScreenWidthDp(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) {
            out->screenWidthDp = out->SCREENWIDTH_ANY;
        }
        return true;
    }

    if (*name != 'w') return false;
    name++;
    const char* x = name;
    while (*x >= '0' && *x <= '9') x++;
    if (x == name || x[0] != 'd' || x[1] != 'p' || x[2] != 0) return false;
    std::string xName(name, x-name);

    if (out) {
        out->screenWidthDp = (uint16_t)atoi(xName.c_str());
    }

    return true;
}

static bool parseScreenHeightDp(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) {
            out->screenHeightDp = out->SCREENWIDTH_ANY;
        }
        return true;
    }

    if (*name != 'h') return false;
    name++;
    const char* x = name;
    while (*x >= '0' && *x <= '9') x++;
    if (x == name || x[0] != 'd' || x[1] != 'p' || x[2] != 0) return false;
    std::string xName(name, x-name);

    if (out) {
        out->screenHeightDp = (uint16_t)atoi(xName.c_str());
    }

    return true;
}

static bool parseVersion(const char* name, ResTable_config* out) {
    if (strcmp(name, kWildcardName) == 0) {
        if (out) {
            out->sdkVersion = out->SDKVERSION_ANY;
            out->minorVersion = out->MINORVERSION_ANY;
        }
        return true;
    }

    if (*name != 'v') {
        return false;
    }

    name++;
    const char* s = name;
    while (*s >= '0' && *s <= '9') s++;
    if (s == name || *s != 0) return false;
    std::string sdkName(name, s-name);

    if (out) {
        out->sdkVersion = (uint16_t)atoi(sdkName.c_str());
        out->minorVersion = 0;
    }

    return true;
}

bool ConfigDescription::parse(const StringPiece& str, ConfigDescription* out) {
    std::vector<std::string> parts = util::splitAndLowercase(str, '-');

    ConfigDescription config;
    ssize_t partsConsumed = 0;
    LocaleValue locale;

    const auto partsEnd = parts.end();
    auto partIter = parts.begin();

    if (str.size() == 0) {
        goto success;
    }

    if (parseMcc(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseMnc(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    // Locale spans a few '-' separators, so we let it
    // control the index.
    partsConsumed = locale.initFromParts(partIter, partsEnd);
    if (partsConsumed < 0) {
        return false;
    } else {
        locale.writeTo(&config);
        partIter += partsConsumed;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseLayoutDirection(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseSmallestScreenWidthDp(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseScreenWidthDp(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseScreenHeightDp(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseScreenLayoutSize(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseScreenLayoutLong(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseOrientation(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseUiModeType(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseUiModeNight(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseDensity(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseTouchscreen(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseKeysHidden(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseKeyboard(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseNavHidden(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseNavigation(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseScreenSize(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    if (parseVersion(partIter->c_str(), &config)) {
        ++partIter;
        if (partIter == partsEnd) {
            goto success;
        }
    }

    // Unrecognized.
    return false;

success:
    if (out != NULL) {
        applyVersionForCompatibility(&config);
        *out = config;
    }
    return true;
}

void ConfigDescription::applyVersionForCompatibility(ConfigDescription* config) {
    uint16_t minSdk = 0;
    if (config->density == ResTable_config::DENSITY_ANY) {
        minSdk = SDK_LOLLIPOP;
    } else if (config->smallestScreenWidthDp != ResTable_config::SCREENWIDTH_ANY
            || config->screenWidthDp != ResTable_config::SCREENWIDTH_ANY
            || config->screenHeightDp != ResTable_config::SCREENHEIGHT_ANY) {
        minSdk = SDK_HONEYCOMB_MR2;
    } else if ((config->uiMode & ResTable_config::MASK_UI_MODE_TYPE)
                != ResTable_config::UI_MODE_TYPE_ANY
            ||  (config->uiMode & ResTable_config::MASK_UI_MODE_NIGHT)
                != ResTable_config::UI_MODE_NIGHT_ANY) {
        minSdk = SDK_FROYO;
    } else if ((config->screenLayout & ResTable_config::MASK_SCREENSIZE)
                != ResTable_config::SCREENSIZE_ANY
            ||  (config->screenLayout & ResTable_config::MASK_SCREENLONG)
                != ResTable_config::SCREENLONG_ANY
            || config->density != ResTable_config::DENSITY_DEFAULT) {
        minSdk = SDK_DONUT;
    }

    if (minSdk > config->sdkVersion) {
        config->sdkVersion = minSdk;
    }
}

} // namespace aapt