package ofxgo

import (
	"errors"
	"github.com/aclindsa/xml"
)

// StatementRequest represents a request for a bank statement. It is used to
// request balances and/or transactions for checking, savings, money market,
// and line of credit accounts. See CCStatementRequest for the analog for
// credit card accounts.
type StatementRequest struct {
	XMLName   xml.Name `xml:"STMTTRNRQ"`
	TrnUID    UID      `xml:"TRNUID"`
	CltCookie String   `xml:"CLTCOOKIE,omitempty"`
	TAN       String   `xml:"TAN,omitempty"` // Transaction authorization number
	// TODO `xml:"OFXEXTENSION,omitempty"`
	BankAcctFrom   BankAcct `xml:"STMTRQ>BANKACCTFROM"`
	DtStart        *Date    `xml:"STMTRQ>INCTRAN>DTSTART,omitempty"`
	DtEnd          *Date    `xml:"STMTRQ>INCTRAN>DTEND,omitempty"`
	Include        Boolean  `xml:"STMTRQ>INCTRAN>INCLUDE"`          // Include transactions (instead of just balance)
	IncludePending Boolean  `xml:"STMTRQ>INCLUDEPENDING,omitempty"` // Include pending transactions
	IncTranImg     Boolean  `xml:"STMTRQ>INCTRANIMG,omitempty"`     // Include transaction images
}

// Name returns the name of the top-level transaction XML/SGML element
func (r *StatementRequest) Name() string {
	return "STMTTRNRQ"
}

// Valid returns (true, nil) if this struct would be valid OFX if marshalled
// into XML/SGML
func (r *StatementRequest) Valid(version ofxVersion) (bool, error) {
	if ok, err := r.TrnUID.Valid(); !ok {
		return false, err
	}
	if r.IncludePending && version < OfxVersion220 {
		return false, errors.New("StatementRequest.IncludePending invalid for OFX < 2.2")
	}
	if r.IncTranImg && version < OfxVersion210 {
		return false, errors.New("StatementRequest.IncTranImg invalid for OFX < 2.1")
	}
	return r.BankAcctFrom.Valid()
}

// Type returns which message set this message belongs to (which Request
// element of type []Message it should appended to)
func (r *StatementRequest) Type() messageType {
	return BankRq
}

// Payee specifies a complete billing address for a payee
type Payee struct {
	XMLName    xml.Name `xml:"PAYEE"`
	Name       String   `xml:"NAME"`
	Addr1      String   `xml:"ADDR1"`
	Addr2      String   `xml:"ADDR2,omitempty"`
	Addr3      String   `xml:"ADDR3,omitempty"`
	City       String   `xml:"CITY"`
	State      String   `xml:"STATE"`
	PostalCode String   `xml:"POSTALCODE"`
	Country    String   `xml:"COUNTRY,omitempty"`
	Phone      String   `xml:"PHONE"`
}

// Valid returns (true, nil) if this struct is valid OFX
func (p Payee) Valid() (bool, error) {
	if len(p.Name) == 0 {
		return false, errors.New("Payee.Name empty")
	} else if len(p.Addr1) == 0 {
		return false, errors.New("Payee.Addr1 empty")
	} else if len(p.City) == 0 {
		return false, errors.New("Payee.City empty")
	} else if len(p.State) == 0 {
		return false, errors.New("Payee.State empty")
	} else if len(p.PostalCode) == 0 {
		return false, errors.New("Payee.PostalCode empty")
	} else if len(p.Country) != 0 && len(p.Country) != 3 {
		return false, errors.New("Payee.Country invalid length")
	} else if len(p.Phone) == 0 {
		return false, errors.New("Payee.Phone empty")
	}
	return true, nil
}

// ImageData represents the metadata surrounding a check or other image file,
// including how to retrieve the image
type ImageData struct {
	XMLName      xml.Name     `xml:"IMAGEDATA"`
	ImageType    imageType    `xml:"IMAGETYPE"`    // One of STATEMENT, TRANSACTION, TAX
	ImageRef     String       `xml:"IMAGEREF"`     // URL or identifier, depending on IMAGEREFTYPE
	ImageRefType imageRefType `xml:"IMAGEREFTYPE"` // One of OPAQUE, URL, FORMURL (see spec for more details on how to access images of each of these types)
	// Only one of the next two should be valid at any given time
	ImageDelay   Int      `xml:"IMAGEDELAY,omitempty"`   // Number of calendar days from DTSERVER (for statement images) or DTPOSTED (for transaction image) the image will become available
	DtImageAvail *Date    `xml:"DTIMAGEAVAIL,omitempty"` // Date image will become available
	ImageTTL     Int      `xml:"IMAGETTL,omitempty"`     // Number of days after image becomes available that it will remain available
	CheckSup     checkSup `xml:"CHECKSUP,omitempty"`     // What is contained in check images. One of FRONTONLY, BACKONLY, FRONTANDBACK
}

// Transaction represents a single banking transaction. At a minimum, it
// identifies the type of transaction (TrnType) and the date it was posted
// (DtPosted). Ideally it also provides metadata to help the user recognize
// this transaction (i.e. CheckNum, Name or Payee, Memo, etc.)
type Transaction struct {
	XMLName       xml.Name      `xml:"STMTTRN"`
	TrnType       trnType       `xml:"TRNTYPE"` // One of CREDIT, DEBIT, INT (interest earned or paid. Note: Depends on signage of amount), DIV, FEE, SRVCHG (service charge), DEP (deposit), ATM (Note: Depends on signage of amount), POS (Note: Depends on signage of amount), XFER, CHECK, PAYMENT, CASH, DIRECTDEP, DIRECTDEBIT, REPEATPMT, OTHER
	DtPosted      Date          `xml:"DTPOSTED"`
	DtUser        *Date         `xml:"DTUSER,omitempty"`
	DtAvail       *Date         `xml:"DTAVAIL,omitempty"`
	TrnAmt        Amount        `xml:"TRNAMT"`
	FiTID         String        `xml:"FITID"`                   // Client uses FITID to detect whether it has previously downloaded the transaction
	CorrectFiTID  String        `xml:"CORRECTFITID,omitempty"`  // Transaction ID that this transaction corrects, if present
	CorrectAction correctAction `xml:"CORRECTACTION,omitempty"` // One of DELETE, REPLACE
	SrvrTID       String        `xml:"SRVRTID,omitempty"`
	CheckNum      String        `xml:"CHECKNUM,omitempty"`
	RefNum        String        `xml:"REFNUM,omitempty"`
	SIC           Int           `xml:"SIC,omitempty"` // Standard Industrial Code
	PayeeID       String        `xml:"PAYEEID,omitempty"`
	// Note: Servers should provide NAME or PAYEE, but not both
	Name       String      `xml:"NAME,omitempty"`
	Payee      *Payee      `xml:"PAYEE,omitempty"`
	ExtdName   String      `xml:"EXTDNAME,omitempty"`   // Extended name of payee or transaction description
	BankAcctTo *BankAcct   `xml:"BANKACCTTO,omitempty"` // If the transfer was to a bank account we have the account information for
	CCAcctTo   *CCAcct     `xml:"CCACCTTO,omitempty"`   // If the transfer was to a credit card account we have the account information for
	Memo       String      `xml:"MEMO,omitempty"`       // Extra information (not in NAME)
	ImageData  []ImageData `xml:"IMAGEDATA,omitempty"`

	// Only one of Currency and OrigCurrency can ever be Valid() for the same transaction
	Currency      Currency      `xml:"CURRENCY,omitempty"`      // Represents the currency of TrnAmt (instead of CURDEF in STMTRS) if Valid
	OrigCurrency  Currency      `xml:"ORIGCURRENCY,omitempty"`  // Represents the currency TrnAmt was converted to STMTRS' CURDEF from if Valid
	Inv401kSource inv401kSource `xml:"INV401KSOURCE,omitempty"` // One of PRETAX, AFTERTAX, MATCH, PROFITSHARING, ROLLOVER, OTHERVEST, OTHERNONVEST (Default if not present is OTHERNONVEST. The following cash source types are subject to vesting: MATCH, PROFITSHARING, and OTHERVEST.)
}

// Valid returns (true, nil) if this struct is valid OFX
func (t Transaction) Valid(version ofxVersion) (bool, error) {
	var emptyDate Date
	if !t.TrnType.Valid() || t.TrnType == TrnTypeHold {
		return false, errors.New("Transaction.TrnType invalid")
	} else if t.DtPosted.Equal(emptyDate) {
		return false, errors.New("Transaction.DtPosted not filled")
	} else if len(t.FiTID) == 0 {
		return false, errors.New("Transaction.FiTID empty")
	} else if len(t.CorrectFiTID) > 0 && t.CorrectAction.Valid() {
		return false, errors.New("Transaction.CorrectFiTID nonempty but CorrectAction invalid")
	} else if len(t.Name) > 0 && t.Payee != nil {
		return false, errors.New("Only one of Transaction.Name and Payee may be specified")
	}
	if t.Payee != nil {
		if ok, err := t.Payee.Valid(); !ok {
			return false, err
		}
	}
	if t.BankAcctTo != nil && t.CCAcctTo != nil {
		return false, errors.New("Only one of Transaction.BankAcctTo and CCAcctTo may be specified")
	} else if t.BankAcctTo != nil {
		if ok, err := t.BankAcctTo.Valid(); !ok {
			return false, err
		}
	} else if t.CCAcctTo != nil {
		if ok, err := t.CCAcctTo.Valid(); !ok {
			return false, err
		}
	}
	if version < OfxVersion220 && len(t.ImageData) > 0 {
		return false, errors.New("Transaction.ImageData only supportd for OFX > 220")
	} else if len(t.ImageData) > 2 {
		return false, errors.New("Only 2 of ImageData allowed in Transaction")
	}
	ok1, _ := t.Currency.Valid()
	ok2, _ := t.OrigCurrency.Valid()
	if ok1 && ok2 {
		return false, errors.New("Currency and OrigCurrency both supplied for Pending Transaction, only one allowed")
	}
	return true, nil
}

// TransactionList represents a list of bank transactions, and also includes
// the date range its transactions cover.
type TransactionList struct {
	XMLName      xml.Name      `xml:"BANKTRANLIST"`
	DtStart      Date          `xml:"DTSTART"` // Start date for transaction data
	DtEnd        Date          `xml:"DTEND"`   // Value that client should send in next <DTSTART> request to ensure that it does not miss any transactions
	Transactions []Transaction `xml:"STMTTRN,omitempty"`
}

// Valid returns (true, nil) if this struct is valid OFX
func (l TransactionList) Valid(version ofxVersion) (bool, error) {
	var emptyDate Date
	if l.DtStart.Equal(emptyDate) {
		return false, errors.New("TransactionList.DtStart not filled")
	} else if l.DtEnd.Equal(emptyDate) {
		return false, errors.New("TransactionList.DtEnd not filled")
	}
	for _, t := range l.Transactions {
		if ok, err := t.Valid(version); !ok {
			return false, err
		}
	}

	return true, nil
}

// PendingTransaction represents a single pending transaction. It is similar to
// Transaction, but is not finalized (and may never be). For instance, it lacks
// FiTID and DtPosted fields.
type PendingTransaction struct {
	XMLName   xml.Name    `xml:"STMTTRNP"`
	TrnType   trnType     `xml:"TRNTYPE"` // One of CREDIT, DEBIT, INT (interest earned or paid. Note: Depends on signage of amount), DIV, FEE, SRVCHG (service charge), DEP (deposit), ATM (Note: Depends on signage of amount), POS (Note: Depends on signage of amount), XFER, CHECK, PAYMENT, CASH, DIRECTDEP, DIRECTDEBIT, REPEATPMT, HOLD, OTHER
	DtTran    Date        `xml:"DTTRAN"`
	DtExpire  *Date       `xml:"DTEXPIRE,omitempty"` // only valid for TrnType==HOLD, the date the hold will expire
	TrnAmt    Amount      `xml:"TRNAMT"`
	RefNum    String      `xml:"REFNUM,omitempty"`
	Name      String      `xml:"NAME,omitempty"`
	ExtdName  String      `xml:"EXTDNAME,omitempty"` // Extended name of payee or transaction description
	Memo      String      `xml:"MEMO,omitempty"`     // Extra information (not in NAME)
	ImageData []ImageData `xml:"IMAGEDATA,omitempty"`

	// Only one of Currency and OrigCurrency can ever be Valid() for the same transaction
	Currency     Currency `xml:"CURRENCY,omitempty"`     // Represents the currency of TrnAmt (instead of CURDEF in STMTRS) if Valid
	OrigCurrency Currency `xml:"ORIGCURRENCY,omitempty"` // Represents the currency TrnAmt was converted to STMTRS' CURDEF from if Valid
}

// Valid returns (true, nil) if this struct is valid OFX
func (t PendingTransaction) Valid() (bool, error) {
	var emptyDate Date
	if !t.TrnType.Valid() {
		return false, errors.New("PendingTransaction.TrnType invalid")
	} else if t.DtTran.Equal(emptyDate) {
		return false, errors.New("PendingTransaction.DtTran not filled")
	} else if len(t.Name) == 0 {
		return false, errors.New("PendingTransaction.Name empty")
	}
	ok1, _ := t.Currency.Valid()
	ok2, _ := t.OrigCurrency.Valid()
	if ok1 && ok2 {
		return false, errors.New("Currency and OrigCurrency both supplied for Pending Transaction, only one allowed")
	}
	return true, nil
}

// PendingTransactionList represents a list of pending transactions, along with
// the date they were generated
type PendingTransactionList struct {
	XMLName      xml.Name             `xml:"BANKTRANLISTP"`
	DtAsOf       Date                 `xml:"DTASOF"` // Date and time this set of pending transactions was generated
	Transactions []PendingTransaction `xml:"STMTTRNP,omitempty"`
}

// Valid returns (true, nil) if this struct is valid OFX
func (l PendingTransactionList) Valid() (bool, error) {
	var emptyDate Date
	if l.DtAsOf.Equal(emptyDate) {
		return false, errors.New("PendingTransactionList.DtAsOf not filled")
	}
	for _, t := range l.Transactions {
		if ok, err := t.Valid(); !ok {
			return false, err
		}
	}

	return true, nil
}

// Balance represents a generic (free-form) balance defined by an FI.
type Balance struct {
	XMLName xml.Name `xml:"BAL"`
	Name    String   `xml:"NAME"`
	Desc    String   `xml:"DESC"`

	// Balance type:
	// DOLLAR = dollar (value formatted DDDD.cc)
	// PERCENT = percentage (value formatted XXXX.YYYY)
	// NUMBER = number (value formatted as is)
	BalType balType `xml:"BALTYPE"`

	Value    Amount    `xml:"VALUE"`
	DtAsOf   *Date     `xml:"DTASOF,omitempty"`
	Currency *Currency `xml:"CURRENCY,omitempty"` // if BALTYPE is DOLLAR
}

// Valid returns (true, nil) if this struct is valid OFX
func (b Balance) Valid() (bool, error) {
	if len(b.Name) == 0 || len(b.Desc) == 0 {
		return false, errors.New("Balance Name and Desc not supplied")
	}
	if !b.BalType.Valid() {
		return false, errors.New("Balance BALTYPE not specified")
	}
	return true, nil
}

// StatementResponse represents a bank account statement, including its
// balances and possibly transactions. It is a response to StatementRequest, or
// sometimes provided as part of an OFX file downloaded manually from an FI.
type StatementResponse struct {
	XMLName   xml.Name `xml:"STMTTRNRS"`
	TrnUID    UID      `xml:"TRNUID"`
	Status    Status   `xml:"STATUS"`
	CltCookie String   `xml:"CLTCOOKIE,omitempty"`
	// TODO `xml:"OFXEXTENSION,omitempty"`
	CurDef        CurrSymbol              `xml:"STMTRS>CURDEF"`
	BankAcctFrom  BankAcct                `xml:"STMTRS>BANKACCTFROM"`
	BankTranList  *TransactionList        `xml:"STMTRS>BANKTRANLIST,omitempty"`
	BankTranListP *PendingTransactionList `xml:"STMTRS>BANKTRANLISTP,omitempty"`
	BalAmt        Amount                  `xml:"STMTRS>LEDGERBAL>BALAMT"`
	DtAsOf        Date                    `xml:"STMTRS>LEDGERBAL>DTASOF"`
	AvailBalAmt   *Amount                 `xml:"STMTRS>AVAILBAL>BALAMT,omitempty"`
	AvailDtAsOf   *Date                   `xml:"STMTRS>AVAILBAL>DTASOF,omitempty"`
	CashAdvBalAmt *Amount                 `xml:"STMTRS>CASHADVBALAMT,omitempty"` // Only for CREDITLINE accounts, available balance for cash advances
	IntRate       *Amount                 `xml:"STMTRS>INTRATE,omitempty"`       // Current interest rate
	BalList       []Balance               `xml:"STMTRS>BALLIST>BAL,omitempty"`
	MktgInfo      String                  `xml:"STMTRS>MKTGINFO,omitempty"` // Marketing information
}

// Name returns the name of the top-level transaction XML/SGML element
func (sr *StatementResponse) Name() string {
	return "STMTTRNRS"
}

// Valid returns (true, nil) if this struct was valid OFX when unmarshalled
func (sr *StatementResponse) Valid(version ofxVersion) (bool, error) {
	var emptyDate Date
	if ok, err := sr.TrnUID.Valid(); !ok {
		return false, err
	} else if ok, err := sr.Status.Valid(); !ok {
		return false, err
	} else if ok, err := sr.CurDef.Valid(); !ok {
		return false, err
	} else if ok, err := sr.BankAcctFrom.Valid(); !ok {
		return false, err
	} else if sr.DtAsOf.Equal(emptyDate) {
		return false, errors.New("StatementResponse.DtAsOf not filled")
	} else if (sr.AvailBalAmt == nil) != (sr.AvailDtAsOf == nil) {
		return false, errors.New("StatementResponse.Avail* must both either be present or absent")
	}
	if sr.BankTranList != nil {
		if ok, err := sr.BankTranList.Valid(version); !ok {
			return false, err
		}
	}
	if sr.BankTranListP != nil {
		if version < OfxVersion220 {
			return false, errors.New("StatementResponse.BankTranListP invalid for OFX < 2.2")
		}
		if ok, err := sr.BankTranListP.Valid(); !ok {
			return false, err
		}
	}
	for _, bal := range sr.BalList {
		if ok, err := bal.Valid(); !ok {
			return false, err
		}
	}
	return true, nil
}

// Type returns which message set this message belongs to (which Response
// element of type []Message it belongs to)
func (sr *StatementResponse) Type() messageType {
	return BankRs
}