version: 1

ruleTemplates:
  ohrt-lastShutdown:
    label: Get Last Shutdown Timestamp
    description: Only works on a POSIX enviornment with bash. Pulls the last timestamp from the most recent events.log archive as the shutdown timestamp.
    tags:
      - OHRT
      - Version_1.0
    configDescriptions:
      path:
        label: Logs folder
        description: Path to the folder containing events.log and it's archives.
        type: TEXT
        required: true
      item:
        label: Shutdown Timestamp Item
        description: Item that holds the timetstamp of the last shutdown.
        type: TEXT
        context: item
        filterCriteria:
          - name: type
            value: DateTime
        required: true
    triggers:
      - id: startlevel_50_trigger
        label: Start level 50
        description: Start Level 50 is reached, the rule engine has started.
        type: core.SystemStartlevelTrigger
        config:
          startlevel: 50
    actions:
      - id: "pull_timestamp_action"
        label: Pull Timestamp
        description: Read the previous events.log and pull the timestamp of the last log statement.
        type: Script
        config:
          script: |
            'use wrapper=true'
            const loggerBase = 'org.openhab.automation.ohrt-lastShutdown.'+ruleUID;
            console.loggerName = loggerBase;
            //osgi.getService('org.apache.karaf.log.core.LogService').setLevel(console.loggerName, 'DEBUG');

            // Imports
            const File = Java.type('java.io.File');
            const FileInputStream = Java.type('java.io.FileInputStream')
            const GZipInputStream = Java.type('java.util.zip.GZIPInputStream');
            const InputStreamReader = Java.type('java.io.InputStreamReader');
            const BufferedReader = Java.type('java.io.BufferedReader');

            // Properties
            const srcDirectory = new File('{{path}}');
            const timestampItem = '{{item}}';

            // Get all the events.log.X.gz files
            const listFiles = srcDirectory.listFiles();
            const file = listFiles.filter(f =>
            f.getName().startsWith("events.log."))
                       .sort(( a,b) => b.lastModified() - a.lastModified())[0]
            console.debug(file);

            try {
              // Open the file for reading
              const fis = new FileInputStream(file);
              const gzis = new GZipInputStream(fis);
              const reader = new InputStreamReader(gzis);
              const breader = new BufferedReader(reader);

              // Get the last line
              let currLine = breader.readLine();
              let lastLine = null;
              while(currLine != null) {
                lastLine = currLine;
                currLine = breader.readLine();
              }

              // Extract the timestamp and convert it to an ISO8601
              let timestamp = time.toZDT(lastLine.substring(0, 22).replace(' ', 'T'));

              // Log a message and update the Item
              console.info('openHAB last shutdown at ' + timestamp);
              items[timestampItem].postUpdate(timestamp);
            } 
            catch(e) {
              console.error(e);
            }
          type: JavaScript