package cdr

import (
	"fmt"
	"time"
)

type (
	// LineKind defines several types of records
	LineKind int
	// ReasonKind is metadata about a certain Line
	ReasonKind int
	// CallKind defines if the call came through a user's PBX
	CallKind int
)

const (
	// UnknownLine aka "never seen this LineKind before"
	UnknownLine LineKind = iota
	// VoiceLine aka "this line belongs to (a part of) a voice call"
	VoiceLine
	// TextLine aka "this line belongs to a text message"
	TextLine
	// DataLine aka "this line belongs to a data session"
	DataLine
)

// LineKindMap translates string from CSV to our typed LineKind
var LineKindMap = map[string]LineKind{
	"Voice": VoiceLine,
	"Data":  DataLine,
	"SMS":   TextLine,
}

const (
	// UnknownReason aka "never seen this reason before"
	UnknownReason ReasonKind = iota
	// ORIG aka "originated"
	ORIG
	// CFIM aka "call forward immediately"
	CFIM
	// CFNA aka "call forward not available"
	CFNA
	// CFBS aka "call forward busy"
	CFBS
	// CFOR aka "call forward out of reach"
	CFOR
	// ROAM aka "roaming"
	ROAM
	// PBXOR aka "PBX out of reach"
	PBXOR
)

func (r ReasonKind) String() string {
	switch r {
	case ORIG:
		return "ORIG"
	case CFIM:
		return "CFIM"
	case CFNA:
		return "CFNA"
	case CFBS:
		return "CFBS"
	case CFOR:
		return "CFOR"
	case ROAM:
		return "ROAM"
	case PBXOR:
		return "PBXOR"
	default:
		return "UNKN"
	}
}

// ReasonKindMap translates string from CSV to our typed ReasonKind
var ReasonKindMap = map[string]ReasonKind{
	"ORIG":  ORIG,
	"CFIM":  CFIM,
	"CFNA":  CFNA,
	"CFBS":  CFBS,
	"CFOR":  CFOR,
	"ROAM":  ROAM,
	"PBXOR": PBXOR,
}

const (
	UnknownCall CallKind = iota
	Regular
	PBX
)

var CallKindMap = map[string]CallKind{
	"Regular": Regular,
	"PBX":     PBX,
}

// Line contains the original metadata of a (call) detail record
type Line struct {
	Id          string
	Time        time.Time
	CLI         string
	From        string
	To          string
	Account     string
	Source      string
	Destination string
	RawCount    int
	RawCosts    int
	Leg         int
	Reason      ReasonKind
	Kind        LineKind

	// non-public properties
	pkg          string
	package_cost int
	network_cost int
	service_cost int
}

// PricedLine connects a cost (buy) and price (sell) to a particular Line
type PricedLine struct {
	Line

	Cost   int
	Price  int
	OurRef string
}

// Call is a record of one or more PricedLines that ultimately form "a call".
type Call struct {
	From        string
	To          string
	Time        time.Time
	Duration    time.Duration
	RawCost     int
	Cost        int
	Price       int
	Kind        CallKind
	Account     string
	Description string
	Legs        []PricedLine
}

func (c *Call) String() string {
	diff := float64(c.RawCost-c.Cost) / 10000.0
	return fmt.Sprintf("%s (%d) (%12s->%12s) cost: %.4f (%.4f=>%+.4f), price: %.4f (dur: %v): %v",
		c.Time.Format(DateTimeFormat), len(c.Legs), c.From, c.To,
		float64(c.Cost)/10000.0, float64(c.RawCost)/10000.0, diff, float64(c.Price)/10000.0, c.Duration, c.Description)
}

// Text is a specific PricedLine for a text message.
type Text struct {
	PricedLine

	Account string
}

func (t *Text) String() string {
	return fmt.Sprintf("%s (%12s->%12s) textCost: %.4f, textPrice: %.4f", t.PricedLine.Line.Time.Format(DateTimeFormat), t.PricedLine.Line.From, t.PricedLine.Line.To, float64(t.PricedLine.Cost)/10000.0, float64(t.PricedLine.Price)/10000.0)
}

// Data is a specific PricedLine that annotates the number of bytes consumed in that session.
type Data struct {
	PricedLine

	Account   string
	Kilobytes int
}

func (d *Data) String() string {
	return fmt.Sprintf("%s (%s) %v kilobytes, cost: %.4f, price: %.4f", d.PricedLine.Line.Time.Format(DateTimeFormat), d.Account, d.Kilobytes, float64(d.PricedLine.Cost)/10000.0, float64(d.PricedLine.Price)/10000.0)
}