package main

import (
	"encoding/xml"
	"fmt"
	"io/ioutil"
	"os"
)

type Account struct {
	XMLName xml.Name `xml:"account"`
	Name string `xml:"name"`
	AccountId string `xml:"id"`
	ParentId string `xml:"parent"`
}

type Split struct {
	XMLName xml.Name `xml:"split"`
	Id string `xml:"id"`
	Value string `xml:"value"`
	Quantity string `xml:"quantity"`
	AccountId string `xml:"account"`
}

type Transaction struct {
	XMLName xml.Name `xml:"transaction"`
	Id string `xml:"id"`
	Date string `xml:"date-posted>date"`
	Description string `xml:"description"`
	Spl []Split `xml:"splits>split"`
}

type ParsedData struct {
	XMLName xml.Name `xml:"gnc-v2"`
	DataCnt []string `xml:"count-data"`
	Accnt []Account `xml:"book>account"`
	Trn []Transaction `xml:"book>transaction"`
}

// 'global' data
var data ParsedData

func main() {

	// open xml file
	file, err := os.Open("c13_skr03.gnucash")
	if err != nil {
		fmt.Println("Error opening file:", err)
		return
	}
	defer file.Close()

	// read xml file
	xmldata, err := ioutil.ReadAll(file)
	if err != nil {
		fmt.Println("Error reading file:", err)
		return
	}

	// unmarshal xml data
	err = xml.Unmarshal(xmldata,&data)
	if err != nil {
		fmt.Println("Error unmarshaling xml data:", err)
		return
	}

	// whooha, this is our data!
	fmt.Println("Parsed accounts:",len(data.Accnt))
	fmt.Println("Parsed transactions:",len(data.Trn))

	//
	// hardcoded account ids we have to look at
	//
	// --- buy
	// wareneingang 19% and 7%
	pid_buy_n := string("8e3b7c42e3173ed85f3d4736e82afb4d")
	pid_buy_s := string("0cfd2ceb45fff89b9d1b7ce3af66cdf3")
	pid_misc  := string("e3acc2865dbf931e41cf2b90240de5c2")
	pid_rep   := string("b1d04ad157cac569f4299d4ddf94ed6f")
	pid_room  := string("4394ed4ffa7266f8f8731080926a7a61")
	pid_cap   := string("4196ee026d1bdb785df2c975fca91ae0")
	// abziehbare vst 19% and 7%
	aid_vst_n := string("7c449e13125d6b93043f963628106db2")
	aid_vst_s := string("006643c1c0a91f2b40614c75a49c6295")
	// --- sales
	// receipts
/*
	aid_rec_n := string("f3e905732b729ba096a50dab60559ce7")
	aid_rec_s := string("66c1b04bd897766cb2be538094e1db6a")
	aid_tip   := string("1d20024badc11a99a8e1cf3a9a64a501")
	aid_dep   := string("9772f4e231f6f5e3100132cc53eb3447")
*/
	// ust
	aid_ust_n := string("e4bd6ff52408be8076f24aeb105893d9")
	aid_ust_s := string("38bf40d16529f2a1e611c073c6c1dc9c")

	// account maps
	type amap struct {
		pid string
		num int
		taxval int
		buy bool
		tax bool
	}
	accnt := make(map[string]amap)

	for ac := range data.Accnt {
		aid := data.Accnt[ac].AccountId
		pid := data.Accnt[ac].ParentId
		// general map
		accnt[aid]=amap{
			pid,ac,0,false,false,
		}
		tmp := accnt[aid]
		switch {
		// ---- buy
		//   -- goods
		case pid == pid_buy_n || pid == pid_misc || pid == pid_rep || pid == pid_room || pid == pid_cap:
			tmp.taxval=19
			tmp.buy=true
			accnt[aid]=tmp
		case pid == pid_buy_s:
			tmp.taxval=7
			tmp.buy=true
			accnt[aid]=tmp
		// mathc pid: verschiedene kosten, reparatur/instandhaltung
		//            raumkosten + anlage/kapitalkonten
		//         -> buy, 19, notax
		//
		//   -- tax
		case aid == aid_vst_n:
			tmp.taxval=19
			tmp.buy=true
			tmp.tax=true
			accnt[aid]=tmp
		case aid == aid_vst_s:
			tmp.taxval=7
			tmp.buy=true
			tmp.tax=true
			accnt[aid]=tmp
		// ---- sales ----
		//   -- receipts
		//      match pid: erloeskonten
		//   -- tax
		case aid == aid_ust_n:
			tmp.taxval=19
			tmp.tax=true
			accnt[aid]=tmp
		case aid == aid_ust_s:
			tmp.taxval=7
			tmp.tax=true
			accnt[aid]=tmp
		}
	}

	// check transactions
	for tc := range data.Trn {
		for tsc := range data.Trn[tc].Spl {
			aid := data.Trn[tc].Spl[tsc].AccountId
			switch {
			case accnt[aid].buy:
				var ret bool
				switch accnt[aid].taxval {
				case 19:
					ret=check_buy(&data.Trn[tc],aid_vst_n)
				case 7:
					ret=check_buy(&data.Trn[tc],aid_vst_s)
				}
				anum := accnt[aid].num
				if ret == false {
					fmt.Println("Problem:", data.Accnt[anum].Name,data.Trn[tc].Date)
				}
			}
		}
	}

}

func check_buy(ta *Transaction,id string) bool {
	for  sc := range ta.Spl {
		if ta.Spl[sc].AccountId == id {
			return true
		}
	}
	return false
}