// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
package com.cloud.template;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.inject.Inject;

import org.apache.cloudstack.api.command.user.template.GetUploadParamsForTemplateCmd;
import org.apache.log4j.Logger;

import org.apache.cloudstack.api.ApiConstants;
import org.apache.cloudstack.api.command.user.iso.DeleteIsoCmd;
import org.apache.cloudstack.api.command.user.iso.RegisterIsoCmd;
import org.apache.cloudstack.api.command.user.template.DeleteTemplateCmd;
import org.apache.cloudstack.api.command.user.template.ExtractTemplateCmd;
import org.apache.cloudstack.api.command.user.template.RegisterTemplateCmd;
import org.apache.cloudstack.context.CallContext;
import org.apache.cloudstack.framework.config.dao.ConfigurationDao;
import org.apache.cloudstack.storage.datastore.db.ImageStoreDao;
import org.apache.cloudstack.storage.datastore.db.ImageStoreVO;
import org.apache.cloudstack.storage.datastore.db.TemplateDataStoreDao;

import com.cloud.api.ApiDBUtils;
import com.cloud.configuration.Config;
import com.cloud.configuration.Resource.ResourceType;
import com.cloud.dc.DataCenterVO;
import com.cloud.dc.dao.DataCenterDao;
import com.cloud.domain.dao.DomainDao;
import com.cloud.event.dao.UsageEventDao;
import com.cloud.exception.InvalidParameterValueException;
import com.cloud.exception.PermissionDeniedException;
import com.cloud.exception.ResourceAllocationException;
import com.cloud.host.dao.HostDao;
import com.cloud.hypervisor.Hypervisor;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.org.Grouping;
import com.cloud.projects.ProjectManager;
import com.cloud.server.ConfigurationServer;
import com.cloud.storage.GuestOS;
import com.cloud.storage.Storage.ImageFormat;
import com.cloud.storage.Storage.TemplateType;
import com.cloud.storage.TemplateProfile;
import com.cloud.storage.VMTemplateVO;
import com.cloud.storage.dao.GuestOSHypervisorDao;
import com.cloud.storage.dao.VMTemplateDao;
import com.cloud.storage.dao.VMTemplateZoneDao;
import com.cloud.user.Account;
import com.cloud.user.AccountManager;
import com.cloud.user.ResourceLimitService;
import com.cloud.user.UserVO;
import com.cloud.user.dao.AccountDao;
import com.cloud.user.dao.UserDao;
import com.cloud.utils.EnumUtils;
import com.cloud.utils.component.AdapterBase;
import com.cloud.utils.exception.CloudRuntimeException;
import com.cloud.vm.UserVmVO;
import com.cloud.vm.dao.UserVmDao;

public abstract class TemplateAdapterBase extends AdapterBase implements TemplateAdapter {
    private final static Logger s_logger = Logger.getLogger(TemplateAdapterBase.class);
    protected @Inject
    DomainDao _domainDao;
    protected @Inject
    AccountDao _accountDao;
    protected @Inject
    ConfigurationDao _configDao;
    protected @Inject
    UserDao _userDao;
    protected @Inject
    AccountManager _accountMgr;
    protected @Inject
    DataCenterDao _dcDao;
    protected @Inject
    VMTemplateDao _tmpltDao;
    protected @Inject
    TemplateDataStoreDao _tmpltStoreDao;
    protected @Inject
    VMTemplateZoneDao _tmpltZoneDao;
    protected @Inject
    UsageEventDao _usageEventDao;
    protected @Inject
    HostDao _hostDao;
    protected @Inject
    UserVmDao _userVmDao;
    protected @Inject
    GuestOSHypervisorDao _osHyperDao;
    protected @Inject
    ResourceLimitService _resourceLimitMgr;
    protected @Inject
    ImageStoreDao _imgStoreDao;
    @Inject
    TemplateManager templateMgr;
    @Inject
    ConfigurationServer _configServer;
    @Inject
    ProjectManager _projectMgr;

    @Override
    public boolean stop() {
        return true;
    }

    @Override
    public TemplateProfile prepare(boolean isIso, Long userId, String name, String displayText, Integer bits, Boolean passwordEnabled, Boolean requiresHVM, String url,
        Boolean isPublic, Boolean featured, Boolean isExtractable, String format, Long guestOSId, List<Long> zoneId, HypervisorType hypervisorType, String accountName,
        Long domainId, String chksum, Boolean bootable, Map details) throws ResourceAllocationException {
        return prepare(isIso, userId, name, displayText, bits, passwordEnabled, requiresHVM, url, isPublic, featured, isExtractable, format, guestOSId, zoneId,
            hypervisorType, chksum, bootable, null, null, details, false, null, false, TemplateType.USER);
    }

    @Override
    public TemplateProfile prepare(boolean isIso, long userId, String name, String displayText, Integer bits, Boolean passwordEnabled, Boolean requiresHVM, String url,
        Boolean isPublic, Boolean featured, Boolean isExtractable, String format, Long guestOSId, List<Long> zoneIdList, HypervisorType hypervisorType, String chksum,
        Boolean bootable, String templateTag, Account templateOwner, Map details, Boolean sshkeyEnabled, String imageStoreUuid, Boolean isDynamicallyScalable,
        TemplateType templateType) throws ResourceAllocationException {
        //Long accountId = null;
        // parameters verification

        if (isPublic == null) {
            isPublic = Boolean.FALSE;
        }

        if (isIso) {
            if (bootable == null) {
                bootable = Boolean.TRUE;
            }
            GuestOS noneGuestOs = ApiDBUtils.findGuestOSByDisplayName(ApiConstants.ISO_GUEST_OS_NONE);
            if ((guestOSId == null || guestOSId == noneGuestOs.getId()) && bootable == true) {
                throw new InvalidParameterValueException("Please pass a valid GuestOS Id");
            }
            if (bootable == false) {
                guestOSId = noneGuestOs.getId(); //Guest os id of None.
            }
        } else {
            if (bits == null) {
                bits = Integer.valueOf(64);
            }
            if (passwordEnabled == null) {
                passwordEnabled = false;
            }
            if (requiresHVM == null) {
                requiresHVM = true;
            }
        }

        if (isExtractable == null) {
            isExtractable = Boolean.FALSE;
        }
        if (sshkeyEnabled == null) {
            sshkeyEnabled = Boolean.FALSE;
        }

        boolean isAdmin = _accountMgr.isRootAdmin(templateOwner.getId());
        boolean isRegionStore = false;
        List<ImageStoreVO> stores = _imgStoreDao.findRegionImageStores();
        if (stores != null && stores.size() > 0) {
            isRegionStore = true;
        }

        if (!isAdmin && zoneIdList == null && !isRegionStore ) {
            // domain admin and user should also be able to register template on a region store
            throw new InvalidParameterValueException("Please specify a valid zone Id. Only admins can create templates in all zones.");
        }

        // check for the url format only when url is not null. url can be null incase of form based upload
        if (url != null && url.toLowerCase().contains("file://")) {
            throw new InvalidParameterValueException("File:// type urls are currently unsupported");
        }

        // check whether owner can create public templates
        boolean allowPublicUserTemplates = TemplateManager.AllowPublicUserTemplates.valueIn(templateOwner.getId());
        if (!isAdmin && !allowPublicUserTemplates && isPublic) {
            throw new InvalidParameterValueException("Only private templates/ISO can be created.");
        }

        if (!isAdmin || featured == null) {
            featured = Boolean.FALSE;
        }

        ImageFormat imgfmt;
        try {
            imgfmt = ImageFormat.valueOf(format.toUpperCase());
        } catch (IllegalArgumentException e) {
            s_logger.debug("ImageFormat IllegalArgumentException: " + e.getMessage());
            throw new IllegalArgumentException("Image format: " + format + " is incorrect. Supported formats are " + EnumUtils.listValues(ImageFormat.values()));
        }

        // Check that the resource limit for templates/ISOs won't be exceeded
        UserVO user = _userDao.findById(userId);
        if (user == null) {
            throw new IllegalArgumentException("Unable to find user with id " + userId);
        }

        _resourceLimitMgr.checkResourceLimit(templateOwner, ResourceType.template);

        // If a zoneId is specified, make sure it is valid
        if (zoneIdList != null) {
            for (Long zoneId :zoneIdList) {
                DataCenterVO zone = _dcDao.findById(zoneId);
                if (zone == null) {
                    throw new IllegalArgumentException("Please specify a valid zone.");
                }
                Account caller = CallContext.current().getCallingAccount();
                if (Grouping.AllocationState.Disabled == zone.getAllocationState() && !_accountMgr.isRootAdmin(caller.getId())) {
                    throw new PermissionDeniedException("Cannot perform this operation, Zone is currently disabled: " + zoneId);
                }
            }
        }

        List<VMTemplateVO> systemvmTmplts = _tmpltDao.listAllSystemVMTemplates();
        for (VMTemplateVO template : systemvmTmplts) {
            if (template.getName().equalsIgnoreCase(name) || template.getDisplayText().equalsIgnoreCase(displayText)) {
                throw new IllegalArgumentException("Cannot use reserved names for templates");
            }
        }

        if (hypervisorType.equals(Hypervisor.HypervisorType.XenServer)) {
            if (details == null || !details.containsKey("hypervisortoolsversion") || details.get("hypervisortoolsversion") == null ||
                ((String)details.get("hypervisortoolsversion")).equalsIgnoreCase("none")) {
                String hpvs = _configDao.getValue(Config.XenServerPVdriverVersion.key());
                if (hpvs != null) {
                    if (details == null) {
                        details = new HashMap<String, String>();
                    }
                    details.put("hypervisortoolsversion", hpvs);
                }
            }
        }

        Long id = _tmpltDao.getNextInSequence(Long.class, "id");
        CallContext.current().setEventDetails("Id: " + id + " name: " + name);
        return new TemplateProfile(id, userId, name, displayText, bits, passwordEnabled, requiresHVM, url, isPublic, featured, isExtractable, imgfmt, guestOSId, zoneIdList,
            hypervisorType, templateOwner.getAccountName(), templateOwner.getDomainId(), templateOwner.getAccountId(), chksum, bootable, templateTag, details,
            sshkeyEnabled, null, isDynamicallyScalable, templateType);

    }

    @Override
    public TemplateProfile prepare(RegisterTemplateCmd cmd) throws ResourceAllocationException {
        //check if the caller can operate with the template owner
        Account caller = CallContext.current().getCallingAccount();
        Account owner = _accountMgr.getAccount(cmd.getEntityOwnerId());
        _accountMgr.checkAccess(caller, null, true, owner);

        boolean isRouting = (cmd.isRoutingType() == null) ? false : cmd.isRoutingType();

        List<Long> zoneId = cmd.getZoneIds();
        // ignore passed zoneId if we are using region wide image store
        List<ImageStoreVO> stores = _imgStoreDao.findRegionImageStores();
        if (stores != null && stores.size() > 0) {
            zoneId = null;
        }

        HypervisorType hypervisorType = HypervisorType.getType(cmd.getHypervisor());
        if(hypervisorType == HypervisorType.None) {
            throw new InvalidParameterValueException("Hypervisor Type: " + cmd.getHypervisor() + " is invalid. Supported Hypervisor types are "
                    + EnumUtils.listValues(HypervisorType.values()).replace("None, ", ""));
        }

        return prepare(false, CallContext.current().getCallingUserId(), cmd.getTemplateName(), cmd.getDisplayText(), cmd.getBits(), cmd.isPasswordEnabled(), cmd.getRequiresHvm(),
                cmd.getUrl(), cmd.isPublic(), cmd.isFeatured(), cmd.isExtractable(), cmd.getFormat(), cmd.getOsTypeId(), zoneId, hypervisorType, cmd.getChecksum(), true,
                cmd.getTemplateTag(), owner, cmd.getDetails(), cmd.isSshKeyEnabled(), null, cmd.isDynamicallyScalable(), isRouting ? TemplateType.ROUTING : TemplateType.USER);

    }

    @Override
    public TemplateProfile prepare(GetUploadParamsForTemplateCmd cmd) throws ResourceAllocationException {
        //check if the caller can operate with the template owner
        Account caller = CallContext.current().getCallingAccount();
        Account owner = _accountMgr.getAccount(cmd.getEntityOwnerId());
        _accountMgr.checkAccess(caller, null, true, owner);

        boolean isRouting = (cmd.isRoutingType() == null) ? false : cmd.isRoutingType();

        List<Long> zoneList = null;
        Long zoneId = cmd.getZoneId();
        // ignore passed zoneId if we are using region wide image store
        List<ImageStoreVO> stores = _imgStoreDao.findRegionImageStores();
        if (!(stores != null && stores.size() > 0)) {
            zoneList = new ArrayList<>();
            zoneList.add(zoneId);
        }

        HypervisorType hypervisorType = HypervisorType.getType(cmd.getHypervisor());
        if(hypervisorType == HypervisorType.None) {
            throw new InvalidParameterValueException("Hypervisor Type: " + cmd.getHypervisor() + " is invalid. Supported Hypervisor types are "
                                                         + EnumUtils.listValues(HypervisorType.values()).replace("None, ", ""));
        }

        return prepare(false, CallContext.current().getCallingUserId(), cmd.getName(), cmd.getDisplayText(), cmd.getBits(), cmd.isPasswordEnabled(),
                       cmd.getRequiresHvm(), null, cmd.isPublic(), cmd.isFeatured(), cmd.isExtractable(), cmd.getFormat(), cmd.getOsTypeId(), zoneList,
                       hypervisorType, cmd.getChecksum(), true, cmd.getTemplateTag(), owner, cmd.getDetails(), cmd.isSshKeyEnabled(), null,
                       cmd.isDynamicallyScalable(), isRouting ? TemplateType.ROUTING : TemplateType.USER);

    }

    @Override
    public TemplateProfile prepare(RegisterIsoCmd cmd) throws ResourceAllocationException {
        //check if the caller can operate with the template owner
        Account caller = CallContext.current().getCallingAccount();
        Account owner = _accountMgr.getAccount(cmd.getEntityOwnerId());
        _accountMgr.checkAccess(caller, null, true, owner);

        List<Long> zoneList = null;
        Long zoneId = cmd.getZoneId();
        // ignore passed zoneId if we are using region wide image store
        List<ImageStoreVO> stores = _imgStoreDao.findRegionImageStores();
        if (!(stores != null && stores.size() > 0)) {
            zoneList = new ArrayList<>();
            zoneList.add(zoneId);
        }

        return prepare(true, CallContext.current().getCallingUserId(), cmd.getIsoName(), cmd.getDisplayText(), 64, false, true, cmd.getUrl(), cmd.isPublic(),
            cmd.isFeatured(), cmd.isExtractable(), ImageFormat.ISO.toString(), cmd.getOsTypeId(), zoneList, HypervisorType.None, cmd.getChecksum(), cmd.isBootable(), null,
            owner, null, false, cmd.getImageStoreUuid(), cmd.isDynamicallyScalable(), TemplateType.USER);
    }

    protected VMTemplateVO persistTemplate(TemplateProfile profile, VirtualMachineTemplate.State initialState) {
        List<Long> zoneIdList = profile.getZoneIdList();
        VMTemplateVO template =
            new VMTemplateVO(profile.getTemplateId(), profile.getName(), profile.getFormat(), profile.getIsPublic(), profile.getFeatured(), profile.getIsExtractable(),
                profile.getTemplateType(), profile.getUrl(), profile.getRequiresHVM(), profile.getBits(), profile.getAccountId(), profile.getCheckSum(),
                profile.getDisplayText(), profile.getPasswordEnabled(), profile.getGuestOsId(), profile.getBootable(), profile.getHypervisorType(),
                profile.getTemplateTag(), profile.getDetails(), profile.getSshKeyEnabled(), profile.IsDynamicallyScalable());
        template.setState(initialState);

        if (zoneIdList == null) {
            List<DataCenterVO> dcs = _dcDao.listAll();

            if (dcs.isEmpty()) {
                throw new CloudRuntimeException("No zones are present in the system, can't add template");
            }

            template.setCrossZones(true);
            for (DataCenterVO dc : dcs) {
                _tmpltDao.addTemplateToZone(template, dc.getId());
            }

        } else {
            for (Long zoneId: zoneIdList) {
                _tmpltDao.addTemplateToZone(template, zoneId);
            }
        }
        return _tmpltDao.findById(template.getId());
    }

    private Long accountAndUserValidation(Account account, long userId, UserVmVO vmInstanceCheck, VMTemplateVO template, String msg) throws PermissionDeniedException {

        if (account != null) {
            if (!_accountMgr.isAdmin(account.getId())) {
                if ((vmInstanceCheck != null) && (account.getId() != vmInstanceCheck.getAccountId())) {
                    throw new PermissionDeniedException(msg + ". Permission denied.");
                }

                if ((template != null) &&
                    (!template.isPublicTemplate() && (account.getId() != template.getAccountId()) && (template.getTemplateType() != TemplateType.PERHOST))) {
                    //special handling for the project case
                    Account owner = _accountMgr.getAccount(template.getAccountId());
                    if (owner.getType() == Account.ACCOUNT_TYPE_PROJECT) {
                        if (!_projectMgr.canAccessProjectAccount(account, owner.getId())) {
                            throw new PermissionDeniedException(msg + ". Permission denied. The caller can't access project's template");
                        }
                    } else {
                        throw new PermissionDeniedException(msg + ". Permission denied.");
                    }
                }
            } else {
                if ((vmInstanceCheck != null) && !_domainDao.isChildDomain(account.getDomainId(), vmInstanceCheck.getDomainId())) {
                    throw new PermissionDeniedException(msg + ". Permission denied.");
                }
                // FIXME: if template/ISO owner is null we probably need to
                // throw some kind of exception

                if (template != null) {
                    Account templateOwner = _accountDao.findById(template.getAccountId());
                    if ((templateOwner != null) && !_domainDao.isChildDomain(account.getDomainId(), templateOwner.getDomainId())) {
                        throw new PermissionDeniedException(msg + ". Permission denied.");
                    }
                }
            }
        }

        return userId;
    }

    @Override
    public TemplateProfile prepareDelete(DeleteTemplateCmd cmd) {
        Long templateId = cmd.getId();
        Long userId = CallContext.current().getCallingUserId();
        Account account = CallContext.current().getCallingAccount();
        Long zoneId = cmd.getZoneId();

        VMTemplateVO template = _tmpltDao.findById(templateId);
        if (template == null) {
            throw new InvalidParameterValueException("unable to find template with id " + templateId);
        }

        userId = accountAndUserValidation(account, userId, null, template, "Unable to delete template ");

        UserVO user = _userDao.findById(userId);
        if (user == null) {
            throw new InvalidParameterValueException("Please specify a valid user.");
        }

        if (template.getFormat() == ImageFormat.ISO) {
            throw new InvalidParameterValueException("Please specify a valid template.");
        }

        return new TemplateProfile(userId, template, zoneId);
    }

    @Override
    public TemplateProfile prepareExtractTemplate(ExtractTemplateCmd cmd) {
        Long templateId = cmd.getId();
        Long userId = CallContext.current().getCallingUserId();
        Long zoneId = cmd.getZoneId();

        VMTemplateVO template = _tmpltDao.findById(templateId);
        if (template == null) {
            throw new InvalidParameterValueException("unable to find template with id " + templateId);
        }
        return new TemplateProfile(userId, template, zoneId);
    }

    @Override
    public TemplateProfile prepareDelete(DeleteIsoCmd cmd) {
        Long templateId = cmd.getId();
        Long userId = CallContext.current().getCallingUserId();
        Account account = CallContext.current().getCallingAccount();
        Long zoneId = cmd.getZoneId();

        VMTemplateVO template = _tmpltDao.findById(templateId);
        if (template == null) {
            throw new InvalidParameterValueException("unable to find iso with id " + templateId);
        }

        userId = accountAndUserValidation(account, userId, null, template, "Unable to delete iso ");

        UserVO user = _userDao.findById(userId);
        if (user == null) {
            throw new InvalidParameterValueException("Please specify a valid user.");
        }

        if (template.getFormat() != ImageFormat.ISO) {
            throw new InvalidParameterValueException("Please specify a valid iso.");
        }

        return new TemplateProfile(userId, template, zoneId);
    }

    @Override
    abstract public VMTemplateVO create(TemplateProfile profile);

    @Override
    abstract public boolean delete(TemplateProfile profile);
}