package parser

import (
	"caatsm/internal/domain"
	"errors"
	"strings"

	"go.uber.org/zap"
)

func ExtractWaypoint(message string) *domain.WayPoint {
	matches := WaypointExpression.FindStringSubmatch(message)
	if matches == nil {
		return nil
	}

	data := make(map[string]string)
	for i, name := range WaypointExpression.SubexpNames() {
		if i != 0 && name != "" {
			data[name] = matches[i]
		}
	}
	result := &domain.WayPoint{
		ArrivalTime:   data[ArrivalTime],
		Airport:       data[AirportCode],
		DepartureTime: data[DepartureTime],
	}

	return result
}

func FindDef(code string) *LineParser {
	// fmt.Printf("Finding definition for %s\n", code)
	// fmt.Println("ParserDef: ", parserDef)
	for _, def := range *parserDef {
		for _, airline := range def.Airlines {
			if airline == code {
				return &def
			}
		}
	}
	return nil
}

func standardizeSpaces(s string) string {
	return strings.Join(strings.Fields(s), " ")
}

func ParseWithDef(line string, parserDef *LineParser) *domain.ScheduleLine {
	log := zap.S()
	cleanLine := standardizeSpaces(strings.TrimSpace(line))
	words := strings.Split(cleanLine, " ")
	var flightSchedule = &domain.ScheduleLine{
		Reference: line,
	}
	if strings.Contains(line, CANCELLED) {
		flightSchedule.Comments = "Cancelled"
		return flightSchedule
	}
	// var result map[string]string
	if parserDef == nil {
		log.Warnf("No definition found: %s", line)
		flightSchedule.Comments = "No definition found [" + line + "] "
		return flightSchedule
	}
	if len(words) < parserDef.MinLen {
		log.Warnf("Line too short: %s", line)
		flightSchedule.Comments = "Line too short [" + line + "] "
		return flightSchedule
	}

	for i, field := range parserDef.Fields {
		// log.Debugf("Parsing field %v -> %s", i, field)
		data := extract(words[i], parserMap[field])
		if data != nil {
			switch field {
			case Index:
				flightSchedule.Index = data[Index]
			case Date:
				flightSchedule.Date = data[Date]
			case Task:
				flightSchedule.Task = data[Task]
			case FlightNumber:
				flightSchedule.FlightNumber = getFlightNumbers(data[FlightNumber])
			case Register:
				flightSchedule.AircraftReg = data[Register]
			}
		}
	}
	if len(words) > parserDef.WaypointStart {
		flightSchedule.Waypoints, _ = parseWaypoints(words[parserDef.WaypointStart:])
	} else {
		log.Warn("No waypoints found")
		flightSchedule.Comments = "No waypoints found"
	}

	return flightSchedule
}

// ParseLine processes a single line of schedule data and returns a ScheduleLine object.
func ParseLine(line string) (*domain.ScheduleLine, error) {
	log := zap.S()
	cleanLine := strings.TrimSpace(line)
	words := strings.Split(cleanLine, " ")
	flightSchedule := &domain.ScheduleLine{Reference: line}

	if indexData := extract(words[0], IndexExpression); indexData != nil {
		flightSchedule.Index = indexData[Index]
		words = words[1:]
	}

	parseStrategy := []string{Task, Date, FlightNumber, Register}
	_, maxParsed, err := parseFields(words, parseStrategy, flightSchedule)
	if err != nil {
		return nil, err
	}

	// Check if there are any waypoints after the parsed fields
	if maxParsed+1 < len(words) {
		waypoints, err := parseWaypoints(words[maxParsed+1:])
		if err != nil {
			return nil, err
		}
		flightSchedule.Waypoints = waypoints
	} else {
		log.Warn("No waypoints found")
		flightSchedule.Comments = "No waypoints found"
	}

	return flightSchedule, nil
}

// parseFields processes the fields based on the given strategy and updates the flight schedule.
func parseFields(words []string, parseStrategy []string, flightSchedule *domain.ScheduleLine) (map[string]bool, int, error) {
	parsed := make(map[string]bool)
	var maxParsed int

	for i, word := range words {
		for _, name := range parseStrategy {
			if parsed[name] {
				continue
			}
			if data := extract(word, parserMap[name]); data != nil {
				updateFlightSchedule(flightSchedule, name, data)
				parsed[name] = true
				maxParsed = i
				break
			}
		}
	}
	return parsed, maxParsed, nil
}

// updateFlightSchedule updates the flight schedule based on the parsed data.
func updateFlightSchedule(flightSchedule *domain.ScheduleLine, name string, data map[string]string) {
	switch name {
	case Task:
		flightSchedule.Task = data[Task]
	case Date:
		flightSchedule.Date = data[Date]
	case FlightNumber:
		flightSchedule.FlightNumber = getFlightNumbers(data[FlightNumber])
	case Register:
		flightSchedule.AircraftReg = data[Register]
	}
}

// parseWaypoints processes a slice of waypoint strings and returns a slice of WayPoint objects.
func parseWaypoints(target []string) ([]domain.WayPoint, error) {
	log := zap.S()
	points := getValidPoints(target)
	if len(points) == 0 {
		log.Warn("No waypoints found")
		return nil, errors.New("no waypoints")
	}
	var waypoints []domain.WayPoint
	for i, point := range points {
		if digits := extract(point, AllDigitsExpression); i > 0 && digits != nil && len(waypoints) > 0 {
			waypoints[len(waypoints)-1].DepartureTime = digits[DepartureTime]
		} else if waypoint := ExtractWaypoint(point); waypoint != nil {
			waypoints = append(waypoints, *waypoint)
		}
	}
	if len(waypoints) == 0 {
		log.Warn("No waypoints found")
		return nil, errors.New("no waypoints")
	}
	return waypoints, nil
}

func getValidPoints(data []string) []string {
	var points []string
	for i, point := range data {
		if extract(point, WaypointExpression) != nil {
			return data[i:]
		}
	}
	return points
}

/**
* 	CZ6794/79
*	CZ3301/2
*  	CA1371/1372/1527
 */
func getFlightNumbers(data string) []string {
	if strings.Contains(data, "/") {
		data := strings.Split(data, "/")
		baseNumber := data[0]
		baseLength := len(baseNumber)
		flightNumbers := append([]string{}, baseNumber)
		for _, number := range data[1:] {
			length := len(number)
			flightNumber := baseNumber[:baseLength-length] + number
			flightNumbers = append(flightNumbers, flightNumber)
		}
		return flightNumbers
	} else {
		return []string{data}
	}
}