/**
 * Copyright © 2016-2018 The Thingsboard Authors
 *
 * 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.
 */
package org.thingsboard.server.controller;

import com.datastax.driver.core.utils.UUIDs;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;
import org.thingsboard.rule.engine.api.ScriptEngine;
import org.thingsboard.server.common.data.EntityType;
import org.thingsboard.server.common.data.audit.ActionType;
import org.thingsboard.server.common.data.id.PluginId;
import org.thingsboard.server.common.data.id.RuleChainId;
import org.thingsboard.server.common.data.id.TenantId;
import org.thingsboard.server.common.data.page.TextPageData;
import org.thingsboard.server.common.data.page.TextPageLink;
import org.thingsboard.server.common.data.plugin.ComponentLifecycleEvent;
import org.thingsboard.server.common.data.plugin.PluginMetaData;
import org.thingsboard.server.common.data.rule.RuleChain;
import org.thingsboard.server.common.data.rule.RuleChainMetaData;
import org.thingsboard.server.common.data.security.Authority;
import org.thingsboard.server.common.msg.TbMsg;
import org.thingsboard.server.common.msg.TbMsgMetaData;
import org.thingsboard.server.dao.model.ModelConstants;
import org.thingsboard.server.exception.ThingsboardException;
import org.thingsboard.server.service.script.NashornJsEngine;

import java.util.List;
import java.util.Map;
import java.util.Set;

@Slf4j
@RestController
@RequestMapping("/api")
public class RuleChainController extends BaseController {

    public static final String RULE_CHAIN_ID = "ruleChainId";

    private static final ObjectMapper objectMapper = new ObjectMapper();

    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
    @RequestMapping(value = "/ruleChain/{ruleChainId}", method = RequestMethod.GET)
    @ResponseBody
    public RuleChain getRuleChainById(@PathVariable(RULE_CHAIN_ID) String strRuleChainId) throws ThingsboardException {
        checkParameter(RULE_CHAIN_ID, strRuleChainId);
        try {
            RuleChainId ruleChainId = new RuleChainId(toUUID(strRuleChainId));
            return checkRuleChain(ruleChainId);
        } catch (Exception e) {
            throw handleException(e);
        }
    }

    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
    @RequestMapping(value = "/ruleChain/{ruleChainId}/metadata", method = RequestMethod.GET)
    @ResponseBody
    public RuleChainMetaData getRuleChainMetaData(@PathVariable(RULE_CHAIN_ID) String strRuleChainId) throws ThingsboardException {
        checkParameter(RULE_CHAIN_ID, strRuleChainId);
        try {
            RuleChainId ruleChainId = new RuleChainId(toUUID(strRuleChainId));
            checkRuleChain(ruleChainId);
            return ruleChainService.loadRuleChainMetaData(ruleChainId);
        } catch (Exception e) {
            throw handleException(e);
        }
    }


    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
    @RequestMapping(value = "/ruleChain", method = RequestMethod.POST)
    @ResponseBody
    public RuleChain saveRuleChain(@RequestBody RuleChain ruleChain) throws ThingsboardException {
        try {
            boolean created = ruleChain.getId() == null;
            ruleChain.setTenantId(getCurrentUser().getTenantId());
            RuleChain savedRuleChain = checkNotNull(ruleChainService.saveRuleChain(ruleChain));

            actorService.onEntityStateChange(ruleChain.getTenantId(), savedRuleChain.getId(),
                    created ? ComponentLifecycleEvent.CREATED : ComponentLifecycleEvent.UPDATED);

            logEntityAction(savedRuleChain.getId(), savedRuleChain,
                    null,
                    created ? ActionType.ADDED : ActionType.UPDATED, null);

            return savedRuleChain;
        } catch (Exception e) {

            logEntityAction(emptyId(EntityType.RULE_CHAIN), ruleChain,
                    null, ruleChain.getId() == null ? ActionType.ADDED : ActionType.UPDATED, e);

            throw handleException(e);
        }
    }

    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
    @RequestMapping(value = "/ruleChain/metadata", method = RequestMethod.POST)
    @ResponseBody
    public RuleChainMetaData saveRuleChainMetaData(@RequestBody RuleChainMetaData ruleChainMetaData) throws ThingsboardException {
        try {
            RuleChain ruleChain = checkRuleChain(ruleChainMetaData.getRuleChainId());
            RuleChainMetaData savedRuleChainMetaData = checkNotNull(ruleChainService.saveRuleChainMetaData(ruleChainMetaData));

            actorService.onEntityStateChange(ruleChain.getTenantId(), ruleChain.getId(), ComponentLifecycleEvent.UPDATED);

            logEntityAction(ruleChain.getId(), ruleChain,
                    null,
                    ActionType.UPDATED, null, ruleChainMetaData);

            return savedRuleChainMetaData;
        } catch (Exception e) {

            logEntityAction(emptyId(EntityType.RULE_CHAIN), null,
                    null, ActionType.UPDATED, e, ruleChainMetaData);

            throw handleException(e);
        }
    }

    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
    @RequestMapping(value = "/ruleChains", params = {"limit"}, method = RequestMethod.GET)
    @ResponseBody
    public TextPageData<RuleChain> getRuleChains(
            @RequestParam int limit,
            @RequestParam(required = false) String textSearch,
            @RequestParam(required = false) String idOffset,
            @RequestParam(required = false) String textOffset) throws ThingsboardException {
        try {
            TextPageLink pageLink = createPageLink(limit, textSearch, idOffset, textOffset);
            if (getCurrentUser().getAuthority() == Authority.SYS_ADMIN) {
                return checkNotNull(ruleChainService.findSystemRuleChains(pageLink));
            } else {
                TenantId tenantId = getCurrentUser().getTenantId();
                TextPageData<RuleChain> ruleChainsData = checkNotNull(ruleChainService.findAllTenantRuleChainsByTenantIdAndPageLink(tenantId, pageLink));
                List<RuleChain> ruleChains = ruleChainsData.getData();
                ruleChains.stream()
                        .filter(ruleChain -> ruleChain.getTenantId().getId().equals(ModelConstants.NULL_UUID))
                        .forEach(ruleChain -> ruleChain.setConfiguration(null));
                return ruleChainsData;
            }
        } catch (Exception e) {
            throw handleException(e);
        }
    }

    @PreAuthorize("hasAuthority('SYS_ADMIN')")
    @RequestMapping(value = "/system/ruleChains", params = {"limit"}, method = RequestMethod.GET)
    @ResponseBody
    public TextPageData<RuleChain> getSystemRuleChains(
            @RequestParam int limit,
            @RequestParam(required = false) String textSearch,
            @RequestParam(required = false) String idOffset,
            @RequestParam(required = false) String textOffset) throws ThingsboardException {
        try {
            TextPageLink pageLink = createPageLink(limit, textSearch, idOffset, textOffset);
            return checkNotNull(ruleChainService.findSystemRuleChains(pageLink));
        } catch (Exception e) {
            throw handleException(e);
        }
    }

    @PreAuthorize("hasAuthority('TENANT_ADMIN')")
    @RequestMapping(value = "/tenant/ruleChains", params = {"limit"}, method = RequestMethod.GET)
    @ResponseBody
    public TextPageData<RuleChain> getTenantRuleChains(
            @RequestParam int limit,
            @RequestParam(required = false) String textSearch,
            @RequestParam(required = false) String idOffset,
            @RequestParam(required = false) String textOffset) throws ThingsboardException {
        try {
            TenantId tenantId = getCurrentUser().getTenantId();
            TextPageLink pageLink = createPageLink(limit, textSearch, idOffset, textOffset);
            return checkNotNull(ruleChainService.findTenantRuleChains(tenantId, pageLink));
        } catch (Exception e) {
            throw handleException(e);
        }
    }

    @PreAuthorize("hasAnyAuthority('SYS_ADMIN', 'TENANT_ADMIN')")
    @RequestMapping(value = "/ruleChain/{ruleChainId}", method = RequestMethod.DELETE)
    @ResponseStatus(value = HttpStatus.OK)
    public void deleteRuleChain(@PathVariable(RULE_CHAIN_ID) String strRuleChainId) throws ThingsboardException {
        checkParameter(RULE_CHAIN_ID, strRuleChainId);
        try {
            RuleChainId ruleChainId = new RuleChainId(toUUID(strRuleChainId));
            RuleChain ruleChain = checkRuleChain(ruleChainId);
            ruleChainService.deleteRuleChainById(ruleChainId);

            actorService.onEntityStateChange(ruleChain.getTenantId(), ruleChain.getId(), ComponentLifecycleEvent.DELETED);

            logEntityAction(ruleChainId, ruleChain,
                    null,
                    ActionType.DELETED, null, strRuleChainId);

        } catch (Exception e) {
            logEntityAction(emptyId(EntityType.RULE_CHAIN),
                    null,
                    null,
                    ActionType.DELETED, e, strRuleChainId);
            throw handleException(e);
        }
    }

    @PreAuthorize("hasAuthority('TENANT_ADMIN')")
    @RequestMapping(value = "/ruleChain/testScript", method = RequestMethod.POST)
    @ResponseBody
    public JsonNode testScript(@RequestBody JsonNode inputParams) throws ThingsboardException {
        try {
            String script = inputParams.get("script").asText();
            String scriptType = inputParams.get("scriptType").asText();
            String functionName = inputParams.get("functionName").asText();
            JsonNode argNamesJson = inputParams.get("argNames");
            String[] argNames = objectMapper.treeToValue(argNamesJson, String[].class);

            String data = inputParams.get("msg").asText();
            JsonNode metadataJson = inputParams.get("metadata");
            Map<String, String> metadata = objectMapper.convertValue(metadataJson, new TypeReference<Map<String, String>>() {});
            String msgType = inputParams.get("msgType").asText();
            String output = "";
            String errorText = "";
            ScriptEngine engine = null;
            try {
                engine = new NashornJsEngine(script, functionName, argNames);
                TbMsg inMsg = new TbMsg(UUIDs.timeBased(), msgType, null, new TbMsgMetaData(metadata), data);
                switch (scriptType) {
                    case "update":
                        output = msgToOutput(engine.executeUpdate(inMsg));
                        break;
                    case "generate":
                        output = msgToOutput(engine.executeGenerate(inMsg));
                        break;
                    case "filter":
                        boolean result = engine.executeFilter(inMsg);
                        output = Boolean.toString(result);
                        break;
                    case "switch":
                        Set<String> states = engine.executeSwitch(inMsg);
                        output = objectMapper.writeValueAsString(states);
                        break;
                    default:
                        throw new IllegalArgumentException("Unsupported script type: " + scriptType);
                }
            } catch (Exception e) {
                log.error("Error evaluating JS function", e);
                errorText = e.getMessage();
            } finally {
                if (engine != null) {
                    engine.destroy();
                }
            }
            ObjectNode result = objectMapper.createObjectNode();
            result.put("output", output);
            result.put("error", errorText);
            return result;
        } catch (Exception e) {
            throw handleException(e);
        }
    }

    private String msgToOutput(TbMsg msg) throws Exception {
        ObjectNode msgData = objectMapper.createObjectNode();
        if (!StringUtils.isEmpty(msg.getData())) {
            msgData.set("msg", objectMapper.readTree(msg.getData()));
        }
        Map<String, String> metadata = msg.getMetaData().getData();
        msgData.set("metadata", objectMapper.valueToTree(metadata));
        msgData.put("msgType", msg.getType());
        return objectMapper.writeValueAsString(msgData);
    }

}
