package statusupdate

import (
	"encoding/csv"
	"strconv"
	"strings"
	"sync"

	"src.dualinventive.com/go/lib/dilog"
)

// UpdateDecoder decodes cp3000 update messages
type UpdateDecoder struct {
	mu              sync.RWMutex
	prevUpdateState *StatusUpdate
	logger          dilog.Logger
}

// NewUpdateDecoder creates a new update decoder. The logger is already attatched
func NewUpdateDecoder(logger dilog.Logger) *UpdateDecoder {
	return &UpdateDecoder{
		prevUpdateState: &StatusUpdate{},
		logger:          logger,
	}
}

// Decode decodes the cp3000 update message
func (d *UpdateDecoder) Decode(args []string) error {
	r := csv.NewReader(strings.NewReader(args[1]))
	r.Comma = ','
	r.LazyQuotes = true
	records, err := r.Read()
	if err != nil {
		return err
	}

	f, err := strconv.ParseUint(strings.Trim(args[0], "\""), 10, 32)
	if err != nil {
		return err
	}
	fields := StatUpdateField(f)

	newStat := *d.prevUpdateState
	newStat.Fields = fields
	// IMPORTANT the order here is important
	records = decodeState(d.logger, &newStat, fields, records)
	records = decodePMGT(d.logger, &newStat, fields, records)
	records = decodeSwitch(d.logger, &newStat, fields, records)
	records = decodeWCPUState(d.logger, &newStat, fields, records)
	records = decodeRMS(d.logger, &newStat, fields, records)
	records = decodeBA(d.logger, &newStat, fields, records)
	records = decodeNATWS(d.logger, &newStat, fields, records)
	records = decodeAutocal(d.logger, &newStat, fields, records)
	records = decodeBatSelected(d.logger, &newStat, fields, records)
	records = decodeBatt1Level(d.logger, &newStat, fields, records)
	records = decodeBatt2Level(d.logger, &newStat, fields, records)
	records = decodeTempOnBoard(d.logger, &newStat, fields, records)
	records = decodeTempNTC(d.logger, &newStat, fields, records)
	records = decodeGSM(d.logger, &newStat, fields, records)
	records = decodeGPS(d.logger, &newStat, fields, records)
	records = decodeTilt(d.logger, &newStat, fields, records)

	if len(records) > 0 {
		d.logger.WithField("recs", records).WithField("fields", fields).Info("more data left")
	}

	d.mu.Lock()
	d.prevUpdateState = &newStat
	d.mu.Unlock()
	return nil
}

// StatusUpdate returns the last known status update
func (d *UpdateDecoder) StatusUpdate() *StatusUpdate {
	d.mu.RLock()
	defer d.mu.RUnlock()
	return d.prevUpdateState
}