package database

import (
	"context"
	"fmt"
	"github.com/influxdata/influxdb-client-go/v2/api"
)

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Tasks
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
func (sr *scrutinyRepository) EnsureTasks(ctx context.Context, orgID string) error {
	weeklyTaskName := "tsk-weekly-aggr"
	if found, findErr := sr.influxTaskApi.FindTasks(ctx, &api.TaskFilter{Name: weeklyTaskName}); findErr == nil && len(found) == 0 {
		//weekly on Sunday at 1:00am
		_, err := sr.influxTaskApi.CreateTaskWithCron(ctx, weeklyTaskName, sr.DownsampleScript("weekly"), "0 1 * * 0", orgID)
		if err != nil {
			return err
		}
	}

	monthlyTaskName := "tsk-monthly-aggr"
	if found, findErr := sr.influxTaskApi.FindTasks(ctx, &api.TaskFilter{Name: monthlyTaskName}); findErr == nil && len(found) == 0 {
		//monthly on first day of the month at 1:30am
		_, err := sr.influxTaskApi.CreateTaskWithCron(ctx, monthlyTaskName, sr.DownsampleScript("monthly"), "30 1 1 * *", orgID)
		if err != nil {
			return err
		}
	}

	yearlyTaskName := "tsk-yearly-aggr"
	if found, findErr := sr.influxTaskApi.FindTasks(ctx, &api.TaskFilter{Name: yearlyTaskName}); findErr == nil && len(found) == 0 {
		//yearly on the first day of the year at 2:00am
		_, err := sr.influxTaskApi.CreateTaskWithCron(ctx, yearlyTaskName, sr.DownsampleScript("yearly"), "0 2 1 1 *", orgID)
		if err != nil {
			return err
		}
	}
	return nil
}

func (sr *scrutinyRepository) DownsampleScript(aggregationType string) string {
	var sourceBucket string // the source of the data
	var destBucket string   // the destination for the aggregated data
	var rangeStart string
	var rangeEnd string
	var aggWindow string
	switch aggregationType {
	case "weekly":
		sourceBucket = sr.appConfig.GetString("web.influxdb.bucket")
		destBucket = fmt.Sprintf("%s_weekly", sr.appConfig.GetString("web.influxdb.bucket"))
		rangeStart = "-2w"
		rangeEnd = "-1w"
		aggWindow = "1w"
	case "monthly":
		sourceBucket = fmt.Sprintf("%s_weekly", sr.appConfig.GetString("web.influxdb.bucket"))
		destBucket = fmt.Sprintf("%s_monthly", sr.appConfig.GetString("web.influxdb.bucket"))
		rangeStart = "-2mo"
		rangeEnd = "-1mo"
		aggWindow = "1mo"
	case "yearly":
		sourceBucket = fmt.Sprintf("%s_monthly", sr.appConfig.GetString("web.influxdb.bucket"))
		destBucket = fmt.Sprintf("%s_yearly", sr.appConfig.GetString("web.influxdb.bucket"))
		rangeStart = "-2y"
		rangeEnd = "-1y"
		aggWindow = "1y"
	}

	// TODO: using "last" function for aggregation. This should eventually be replaced with a more accurate represenation
	/*
	  import "types"
	  smart_data = from(bucket: sourceBucket)
	  |> range(start: rangeStart, stop: rangeEnd)
	  |> filter(fn: (r) => r["_measurement"] == "smart" )
	  |> group(columns: ["device_wwn", "_field"])

	  non_numeric_smart_data = smart_data
	    |> filter(fn: (r) => types.isType(v: r._value, type: "string") or types.isType(v: r._value, type: "bool"))
	    |> aggregateWindow(every: aggWindow, fn: last, createEmpty: false)

	  numeric_smart_data = smart_data
	    |> filter(fn: (r) => types.isType(v: r._value, type: "int") or types.isType(v: r._value, type: "float"))
	    |> aggregateWindow(every: aggWindow, fn: mean, createEmpty: false)

	  union(tables: [non_numeric_smart_data, numeric_smart_data])
	  |> to(bucket: destBucket, org: destOrg)

	*/

	return fmt.Sprintf(`
  sourceBucket = "%s"
  rangeStart = %s
  rangeEnd = %s
  aggWindow = %s
  destBucket = "%s"
  destOrg = "%s"

  from(bucket: sourceBucket)
  |> range(start: rangeStart, stop: rangeEnd)
  |> filter(fn: (r) => r["_measurement"] == "smart" )
  |> group(columns: ["device_wwn", "_field"])
  |> aggregateWindow(every: aggWindow, fn: last, createEmpty: false)
  |> to(bucket: destBucket, org: destOrg)

  temp_data = from(bucket: sourceBucket)
  |> range(start: rangeStart, stop: rangeEnd)
  |> filter(fn: (r) => r["_measurement"] == "temp")
  |> group(columns: ["device_wwn"])
  |> toInt()

  temp_data
  |> aggregateWindow(fn: mean, every: aggWindow)
  |> to(bucket: destBucket, org: destOrg)
		`,
		sourceBucket,
		rangeStart,
		rangeEnd,
		aggWindow,
		destBucket,
		sr.appConfig.GetString("web.influxdb.org"),
	)
}