package db

import (
	"fmt"
	"time"

	"github.com/briandowns/spinner"
	"golang.org/x/text/language"
	"golang.org/x/text/message"

	"github.com/turbot/steampipe/cmdconfig"
	"github.com/turbot/steampipe/constants"
	"github.com/turbot/steampipe/definitions/results"
	"github.com/turbot/steampipe/utils"
)

// ExecuteSync :: execute a query against this client and wait for the result
func (c *Client) ExecuteSync(query string) (*results.SyncQueryResult, error) {
	// https://github.com/golang/go/wiki/CodeReviewComments#indent-error-flow
	result, err := c.executeQuery(query, false)
	if err != nil {
		return nil, err
	}
	syncResult := &results.SyncQueryResult{ColTypes: result.ColTypes}
	for row := range *result.RowChan {
		syncResult.Rows = append(syncResult.Rows, row)
	}
	syncResult.Duration = <-result.Duration
	return syncResult, nil
}

func (c *Client) executeQuery(query string, countStream bool) (*results.QueryResult, error) {
	if query == "" {
		return &results.QueryResult{}, nil
	}

	start := time.Now()

	// channel to flag to spinner that the query has run
	queryDone := make(chan bool, 1)

	// start spinner after a short delay
	var spinner *spinner.Spinner

	if cmdconfig.Viper().GetBool(constants.ShowInteractiveOutputConfigKey) {
		// if showspinner is false, the spinner gets created, but is never shown
		// so the s.Active() will always come back false . . .
		spinner = utils.StartSpinnerAfterDelay("Loading results...", constants.SpinnerShowTimeout, queryDone)
	} else {
		// no point in showing count if we don't have the spinner
		countStream = false
	}

	rows, err := c.dbClient.Query(query)
	queryDone <- true

	if err != nil {
		// in case the query takes a long time to fail
		utils.StopSpinner(spinner)
		return nil, err
	}

	colTypes, err := rows.ColumnTypes()
	if err != nil {
		return nil, fmt.Errorf("error reading columns from query: %v", err)
	}
	cols, err := rows.Columns()

	result := results.NewQueryResult(colTypes)

	rowCount := 0

	// read the rows in a go routine
	go func() {
		// defer this, so that these get cleaned up even if there is an unforeseen error
		defer func() {
			// close the channels in the result object
			result.Close()
			// close the sql rows object
			rows.Close()
		}()

		for rows.Next() {
			// slice of interfaces to receive the row data
			columnValues := make([]interface{}, len(cols))
			// make a slice of pointers to the result to pass to scan
			resultPtrs := make([]interface{}, len(cols)) // A temporary interface{} slice
			for i := range columnValues {
				resultPtrs[i] = &columnValues[i]
			}
			err = rows.Scan(resultPtrs...)
			if err != nil {
				utils.ShowErrorWithMessage(err, "Failed to scan row")
				return
			}
			// populate row data - handle special case types
			rowResult := populateRow(columnValues, colTypes)

			if !countStream {
				// stop the spinner if we don't want to show load count
				utils.StopSpinner(spinner)
			}

			// we have started populating results
			result.StreamRow(rowResult)

			// update the spinner message with the count of rows that have already been fetched
			utils.UpdateSpinnerMessage(spinner, fmt.Sprintf("Loading results: %3s", humanizeRowCount(rowCount)))
			rowCount++
		}

		// we are done fetching results. time for display. remove the spinner
		utils.StopSpinner(spinner)

		// set the time that it took for this one to execute
		result.Duration <- time.Since(start)

		// now check for errors
		rows.Close()
		if err = rows.Err(); err != nil {
			result.StreamError(err)
		}
	}()

	return result, nil
}

func humanizeRowCount(count int) string {
	p := message.NewPrinter(language.English)
	return p.Sprintf("%d", count)
}