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"
)

// 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.Info("Too early to update CIF data, not published until 0600")
		return
	}

	log.Debug("Checking age of CIF Data")

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

	// If no metadata is found in DB, presume no CIF data exists
	if metadata == nil {
		log.Info("Full CIF download required")
		err := runCifFullDownload(cfg)
		if err != nil {
			log.Error("Unable to run full CIF Update", zap.Error(err))
		}
		return
	}

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

	// Check how many days since last update, if more than 5, run full update, else run update
	daysSinceLastUpdate := howManyDaysAgo(metadata.LastUpdate)
	if daysSinceLastUpdate > 5 {
		log.Debug("Full Update Requested due to time since last update", zap.Int("daysSinceLastUpdate", daysSinceLastUpdate))
		log.Info("Full CIF download required")
		err := runCifFullDownload(cfg)
		if err != nil {
			log.Error("Full CIF update failed", zap.Error(err))
		}
		return
	}

	daysToUpdate := generateUpdateDays(daysSinceLastUpdate)

	// Run the update
	log.Info("CIF Update required", zap.Any("days to update", daysToUpdate))
	err = runCifUpdateDownload(cfg, metadata, daysToUpdate)
	if err != nil {
		log.Error("Daily CIF update failed", zap.Error(err))
	}
}