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'
import uniqid from 'uniqid'

// TODO add custom levels
// is pro log to file working???

function child (bindings = {}, options = {}) {
  const pinoOpts = Object.assign({}, options.pino)
  const opts = Object.assign({}, options)
  delete opts.pino

  const enabled = !!process.env.UCI_ENV

  let pretty; let filter; let LOG_PATH; let DATE_TIME; let destination; let file

  let hidden = Array.isArray(opts.hide) ? opts.hide : [opts.hide]

  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']

  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(opts).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) {
      mkdir(dirname(LOG_PATH)) // makes recursively for any missing parent directories
      destination = LOG_PATH
    }
  } // end enabled

  // default bindings
  bindings.appName = process.env.UCI_LOG_APP || bindings.appName || bindings.name
  bindings.library = bindings.library || typeof bindings.package === 'string' ? (bindings.package.includes('@') ? (bindings.package.replace(/[@]+/g, '')).split('/')[0] : undefined) : undefined
  bindings.repo = bindings.repo || ((typeof bindings.package === 'string') ? bindings.package.replace(/[@]+/g, '').replace(/[/]+/g, '-') : undefined)
  bindings.file = bindings.file || ((typeof bindings.package === 'string') ? `src/${basename(bindings.package)}.js` : undefined)
  bindings.class = bindings.class || (bindings.class !== false && typeof bindings.package === 'string') ? capitalize(basename(bindings.package)) : undefined
  bindings.instanceCreatedHR = DATE_TIME
  bindings.instanceCreated = Date.now()

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

  if (pinoOpts.destination) {
    destination = pinoOpts.destination
    delete pinoOpts.destination
  }

  const defaultLevel = pinoOpts.level || opts.level || process.env.UCI_LOG_LEVEL || 'info'

  const defaultOpts = {
    enabled: enabled,
    safe: true,
    level: defaultLevel,
    formatters: {
      bindings (obj) {
        return { machine: obj }
      }
    },
    timestamp: pino.stdTimeFunctions.epochTime,
    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
  }

  const logger = pino(
    Object.assign({}, defaultOpts, pinoOpts),
    // if production not enabled then LOG_PATH is empty and logs go to stdout/stderr and can be piped from there
    destination
  )

  const child = logger.child({ meta: bindings }, {
    formatters: {
      log (obj) {
        // console.log('formatter', obj.level, child.level)
        obj.dateTime = new Date().toString()
        if (!pretty) {
          obj.label = child.level
          if (!opts.noID) obj[opts.keyID || '_id'] = uniqid()
        } else {
          obj.file = obj.file || file
          hidden.forEach(prop => {
            // console.log('hiding', prop, obj[prop])
            obj[prop] = undefined
          })
        }
        return obj
      }
    }
  })

  child.default = defaultLevel
  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 }

  child.hide = (props) => {
    hidden = arraysMerge(props, hidden)
  }

  child.unhide = (props) => {
    hidden = arraysFilter(props, hidden)
  }

  child.locate = locate

  return child
}

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

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
    const filteredLog = {}
    options.filter.forEach(prop => { filteredLog[prop] = log[prop] })
    // console.log('filtered',options.filter, filteredLog)
    return pinoPretty(options)(filteredLog)
  }
}

// TODO move these to @uci-utils/helpers

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

function locate (frame = 2, ret) {
  if (typeof frame === 'string') { ret = frame; frame = 2 }
  const e = new Error()
  const stack = e.stack.toString().split(/\r\n|\n/)
  const RE = /file:\/\/(.*):(\d+):(?:\d+)[^\d]*$/
  const reg = RE.exec(stack[frame])
  const str = ret ? (ret === 'n' ? reg[2] : reg[1]) : `${reg[2]}:${reg[1]}`
  return str // return line#:path
}

function arraysMerge (els, arr) {
  els = Array.isArray(els) ? els : [els]
  return [...new Set([...arr, ...els])].filter(el => el != null)
}

function arraysFilter (els, arr) {
  els = Array.isArray(els) ? els : [els]
  return arr.filter(function (item) {
    return !els.includes(item)
  })
}