package cif

import (
	"time"

	"git.fjla.uk/owlboard/timetable-mgr/dbAccess"
	"git.fjla.uk/owlboard/timetable-mgr/helpers"
	"git.fjla.uk/owlboard/timetable-mgr/log"
	"go.uber.org/zap"
)

// REWRITING CifCheck into CheckCif (at bottom of file), CifCheck and parseMetadata become redundant

// Loads CifMetadata and passes it to parseMetadata, this function is what you should call to initiate the CifUpdate process.
func CifCheck(cfg *helpers.Configuration) error {
	log.Msg.Debug("Checking age of CIF Data")
	metadata, err := dbAccess.GetCifMetadata()
	if err != nil {
		return err
	}

	err = parseMetadata(metadata, cfg)
	if err != nil {
		log.Msg.Error("Error updating CIF Data", zap.Error(err))
		return err
	}

	return nil
}

// Requests a full update if no metadata exists, or a daily update if metadata does exist.
// The daily update function does further metadata parsing to determine what exactly needs downloading.
func parseMetadata(metadata *dbAccess.CifMetadata, cfg *helpers.Configuration) error {
	if metadata == nil {
		log.Msg.Info("No metadata, creating Timetable data")
		newMeta, err := runFullUpdate(cfg)
		if err != nil {
			return err
		}
		ok := dbAccess.PutCifMetadata(*newMeta)
		if !ok {
			log.Msg.Error("CIF Data updated but Metadata Update failed")
		}
		return nil
	}

	log.Msg.Debug("Requesting CIF Data Update")
	// When testing done, this function returns newMetadata which needs putting into DB
	_, err := runUpdate(metadata, cfg)
	if err != nil {
		return err
	}
	//ok := dbAccess.PutCifMetadata(*newMeta)
	//if !ok {
	//	log.Msg.Error("CIF Data updated but Metadata Update failed")
	//}
	return nil
}

// Checks if the CIF Data needs updating, and what type of update is needed (Full/Partial) and if partial
// what days data needs updating, then calls an update function to handle the update.
func CheckCif(cfg *helpers.Configuration) {
	// Check that it is after 0600, if not then skip update
	if time.Now().In(londonTimezone).Hour() <= dataAvailable {
		log.Msg.Info("Too early to update CIF data, not published until 0600")
		return
	}

	log.Msg.Info("Checking age of CIF Data")

	// Load and read metadata from database
	metadata, err := dbAccess.GetCifMetadata()
	if err != nil {
		log.Msg.Error("Unable to read last update time")
		return
	}

	if metadata == nil {
		log.Msg.Info("Full CIF download required")
		err := runCifFullDownload(cfg)
		if err != nil {
			log.Msg.Error("Unable to run full CIF Update")
			return
		}
		return
	}

	// Check if last update was today
	if isSameToday(metadata.LastUpdate) {
		log.Msg.Info("CIF Data has already been updated today, skipping")
		return
	}

	//

	// Here I need to determine which days I need to update CIF data for, then pass to an appropriate function:
	// newMetadata, err := runCifUpdate(days []time.Time, cfg)
}