package cdr

import (
	"encoding/csv"
)

// Some assumptions on our input, since encoding/csv reads everything as string. We expect 17 entries per line:
// cid,time,type,cli,from,to,account,usage,costs,source,destination,leg,reason,package,package_costs,network_costs,service_costs
//
//   - cid is free text, could be argued to be unique, but there are no guarantees.
//   - time is a timestamp formatted YYYY-MM-DD hh:mm:sd
//   - type is in {Voice,Data,SMS}, of course the header line is "type"
//   - cli,from should be \d+ (eg 31676012321)
//   - to is either [0-9*]+ for a (partially shielded/) phonenumber, or .+ for APN or Voicemail, or the likes
//   - account is free text (non-empty)
//   - usage is an integer >= 0
//   - costs is a float with four decimal digits. We strip the dot and interpret it as an integer, to avoid weird rounding errors during processing
//   - source,destination are free text, but typically either empty or take the form "word(s) - word(s) - word(s)"
//   - leg is an integer >= 1
//   - reason is in {ORIG,CFIM,CFOR,CFNA,CFBS,ROAM,PBXOR}, but there might be other ones
//   - package is free text (or empty)
//   - {package,network,service}_costs are either empty or conform to the "costs" column

// FieldsPerLine are the expected number of fields in each CSV line.
const FieldsPerLine = 17

// ImportIndex keeps track of what column corresponds to what data.
type ImportIndex int

// These are our numbered input fields
const (
	ImportUnknown ImportIndex = iota
	ImportCid
	ImportTime
	ImportType
	ImportCLI
	ImportFrom
	ImportTo
	ImportAccount
	ImportUsage
	ImportCosts
	ImportSource
	ImportDestination
	ImportLeg
	ImportReason
	ImportPackage
	ImportPackageCosts
	ImportNetworkCosts
	ImportServiceCosts
)