import pino from 'pino'
import envPaths from 'env-paths'
import { sync as mkdir } from 'make-dir'
import { dirname, basename } from 'path'
import pinoPretty from 'pino-pretty'

function child  (opts) {

  const enabled = !!process.env.UCI_ENV

  let pretty; let filter; let LOG_PATH; let DATE_TIME

  const PRETTY_DEFAULTS = {translateTime:true, colorize:true, levelFirst:true}
  const DEFAULT_FILTER_PROPS = ['level','time','pid','msg']
  const WHERE_FILTER_PROPS = ['package','file','class','method','function','line']

  let logOpts = {
    level:opts.level || process.env.UCI_LOG_LEVEL,
    logPath: LOG_PATH, // if logging to file
    appName: process.env.UCI_LOG_APP || opts.appName || opts.name,
    package: opts.package,
    repo: opts.repo || ((typeof opts.package==='string') ? opts.package.replace( /[@]+/g, '' ).replace( /[/]+/g, '-' ) : undefined),
    file: opts.file || ((typeof opts.package==='string') ? `src/${basename(opts.package)}.js` : undefined),
    class: opts.class || ( (typeof opts.package==='string') ? capitalize(basename(opts.package)) : undefined),
    id: opts.id || opts.name || 'none',
    instanceCreatedHR:DATE_TIME,
    instanceCreated:Date.now()
  }

  if (enabled) {
    if (opts.env) (opts.envForce) ? (process.env.UCI_ENV = opts.env) : (process.env.UCI_ENV = process.env.UCI_ENV || opts.env)
    if (process.env.UCI_ENV === 'node') process.env.UCI_ENV = process.env.NODE_ENV
    if((process.env.UCI_ENV.indexOf('dev')>-1 || process.env.UCI_LOG_PRETTY) && process.env.UCI_LOG_JSON !=='true' ) { // pretty is on
      // process UCI_LOG_PRETTY
      try {
        pretty = JSON.parse(process.env.UCI_LOG_PRETTY)
      }
      catch (error) {
        // console.log('LOGGER: could not JSON parse',process.env.UCI_LOG_PRETTY )
      }
      if (process.env.UCI_LOG_PRETTY==='verbose') pretty ={include:'all'}
      pretty = pretty || opts.pretty || {}
      pretty = Object.assign({},PRETTY_DEFAULTS,pretty)
      pretty.search = process.env.UCI_LOG_SEARCH
      pretty.include = pretty.include === 'all' ? 'all' : `level${pretty.include ? ','+ pretty.include : ''}`
      pretty.ignore = pretty.include === 'all' ? null : Object.keys(logOpts).filter(key => pretty.include.indexOf(key) === -1 ).join()


      if (process.env.UCI_LOG_PRETTY === 'terse' || process.env.UCI_LOG_PRETTY === 'where' || pretty.filter ) {
        filter = filterPretty  // only call prefilter if some filter is supplied, otherwise
        pretty.filter = [...DEFAULT_FILTER_PROPS,...(process.env.UCI_LOG_PRETTY === 'where' ? WHERE_FILTER_PROPS : []),...(pretty.filter||[])]
        pretty.ignore = null
      }
    }
  

    DATE_TIME = new Date().toString()
    LOG_PATH = ( process.env.UCI_ENV.indexOf('pro') > -1 || process.env.UCI_ENV === 'logfile' )
      ? ( process.env.UCI_LOG_PATH || `${envPaths(opts.appName || opts.name || 'default').log}/${opts.logFileName || DATE_TIME}.log`) : undefined
    if (LOG_PATH) {
      try { mkdir(dirname(LOG_PATH)) }  // makes recursively for any missing parent directories
      catch(err) { throw err }
    }
  } // end enabled

  // console.dir(pretty)
  // console.dir(logOpts)

  const logger = pino({
    name: opts.libraryName || process.env.UCI_LOG_NAME || 'UCI',
    enabled: enabled,
    safe: true,
    serializers: {
      req: pino.stdSerializers.req,
      res: pino.stdSerializers.res
    },
    prettyPrint: pretty,
    prettifier: filter // only call prefilter if some filter is supplied, otherwise see line 53
  },
  // if production not enabled then LOG_PATH is empty and logs go to stdout/stderr and can be piped from there
  LOG_PATH
  )

  let child = logger.child(logOpts)

  child.default = process.env.UCI_LOG_LEVEL || opts.level || 'info'
  child.clear = () => {
    if (enabled) {
      if (process.env.UCI_ENV.indexOf('pro') > -1) return null } // enable feature here
  }
  child.div = value => {
    if (enabled) {
      if (process.env.UCI_ENV.indexOf('dev') > -1) console.log(`===== ${value} ========`)}
  }
  child.lvlset = (level) => { if (enabled) child.level = level || child.default }

  return child
}

export default child
const levels = pino.levels
export {child as logger, levels}

function capitalize (s) { return s.charAt(0).toUpperCase() + s.slice(1)}

function filterPretty (options) {
  // console.log('filter options',options)
  return function prettifier (inputData) {
    // console.log('calling filter',inputData)
    let log
    let parsedData
    if (typeof inputData === 'string') {
      try { log = JSON.Parse(inputData)}
      catch(err){ return inputData }
    }
    else log = inputData
    let filteredLog = {}
    options.filter.forEach(prop => filteredLog[prop]= log[prop])
    // console.log('filtered',options.filter, filteredLog)
    return pinoPretty(options)(filteredLog)
  }
}