package ted

import (
	"encoding/xml"
	"fmt"
	"strings"
	"tm/pkg/notification"
	"tm/pkg/xmlparser"
)

type ParserType string

const (
	ParserTypeContractNotice                        ParserType = "ContractNotice"
	ParserTypeContractAwardNotice                   ParserType = "ContractAwardNotice"
	ParserTypePriorInformationNotice                ParserType = "PriorInformationNotice"
	ParserTypeBusinessRegistrationInformationNotice ParserType = "BusinessRegistrationInformationNotice"
)

type TEDParser struct {
	Notification notification.SDK
	NoticeParser xmlparser.Parser[ContractNotice]
}

// NewTEDParser creates a new TED parser
func NewTEDParser() *TEDParser {
	options := xmlparser.DefaultParserOptions()
	options.MaxSize = 50 * 1024 * 1024   // 50MB limit for TED XML files
	options.IgnoreUnknownElements = true // TED XML has many optional fields

	parser := xmlparser.NewParser[ContractNotice](options)
	return &TEDParser{
		NoticeParser: parser,
	}
}

// ParseAnyNotice parses XML content and detects the notice type automatically
func (tp *TEDParser) Parse(content []byte) (interface{}, string, ParserType, error) {
	// First, detect the root element type
	rootElement, err := detectRootElement(content)
	if err != nil {
		return nil, "", ParserType(""), fmt.Errorf("failed to detect root element: %w", err)
	}

	// Parse based on the detected type
	switch ParserType(rootElement) {
	case ParserTypeContractNotice:
		notice, err := tp.parseContractNotice(content)
		return notice, notice.GetID(), ParserTypeContractNotice, err
	case ParserTypeContractAwardNotice:
		notice, err := tp.parseContractAwardNotice(content)
		return notice, notice.GetID(), ParserTypeContractAwardNotice, err
	case ParserTypePriorInformationNotice:
		notice, err := tp.parsePriorInformationNotice(content)
		return notice, notice.GetID(), ParserTypePriorInformationNotice, err
	case ParserTypeBusinessRegistrationInformationNotice:
		notice, err := tp.parseBusinessRegistrationInformationNotice(content)
		return notice, notice.GetID(), ParserTypeBusinessRegistrationInformationNotice, err
	default:
		return nil, "", ParserType(""), fmt.Errorf("unsupported notice type: %s", rootElement)
	}
}

// detectRootElement detects the root XML element name
func detectRootElement(content []byte) (string, error) {
	decoder := xml.NewDecoder(strings.NewReader(string(content)))
	for {
		token, err := decoder.Token()
		if err != nil {
			return "", err
		}
		if startElement, ok := token.(xml.StartElement); ok {
			return startElement.Name.Local, nil
		}
	}
}

// parseContractNotice parses a ContractNotice
func (tp *TEDParser) parseContractNotice(content []byte) (*ContractNotice, error) {
	options := xmlparser.DefaultParserOptions()
	options.MaxSize = 50 * 1024 * 1024
	options.IgnoreUnknownElements = true

	parser := xmlparser.NewParser[ContractNotice](options)
	notice, err := parser.ParseBytes(content)
	if err != nil {
		return nil, err
	}
	return notice, nil
}

// parseContractAwardNotice parses a ContractAwardNotice
func (tp *TEDParser) parseContractAwardNotice(content []byte) (*ContractAwardNotice, error) {
	options := xmlparser.DefaultParserOptions()
	options.MaxSize = 50 * 1024 * 1024
	options.IgnoreUnknownElements = true

	parser := xmlparser.NewParser[ContractAwardNotice](options)
	notice, err := parser.ParseBytes(content)
	if err != nil {
		return nil, err
	}
	return notice, nil
}

// parsePriorInformationNotice parses a PriorInformationNotice
func (tp *TEDParser) parsePriorInformationNotice(content []byte) (*PriorInformationNotice, error) {
	options := xmlparser.DefaultParserOptions()
	options.MaxSize = 50 * 1024 * 1024
	options.IgnoreUnknownElements = true

	parser := xmlparser.NewParser[PriorInformationNotice](options)
	notice, err := parser.ParseBytes(content)
	if err != nil {
		return nil, err
	}
	return notice, nil
}

// parseBusinessRegistrationInformationNotice parses a BusinessRegistrationInformationNotice
func (tp *TEDParser) parseBusinessRegistrationInformationNotice(content []byte) (*BusinessRegistrationInformationNotice, error) {
	options := xmlparser.DefaultParserOptions()
	options.MaxSize = 50 * 1024 * 1024
	options.IgnoreUnknownElements = true

	parser := xmlparser.NewParser[BusinessRegistrationInformationNotice](options)
	notice, err := parser.ParseBytes(content)
	if err != nil {
		return nil, err
	}
	return notice, nil
}

// GetID returns the contract notice ID
func (cn ContractNotice) GetID() string {
	return cn.ID
}

// GetID returns the contract award notice ID
func (can ContractAwardNotice) GetID() string {
	return can.ID
}

// GetID returns the prior information notice ID
func (pin PriorInformationNotice) GetID() string {
	return pin.ID
}

// GetID returns the business registration information notice ID
func (brin BusinessRegistrationInformationNotice) GetID() string {
	return brin.ID
}

// Validate validates the parsed model
func (cn ContractNotice) Validate() error {
	return nil
}

// Validate validates the parsed model
func (can ContractAwardNotice) Validate() error {
	return nil
}

// Validate validates the parsed model
func (pin PriorInformationNotice) Validate() error {
	return nil
}

// Validate validates the parsed model
func (brin BusinessRegistrationInformationNotice) Validate() error {
	return nil
}