package main

import (
	"fmt"
	"io"
)

// printAppRegion is spec §11's one line after "created app …": nothing on
// a single-region deployment, C13a when an older console ignored --region,
// C13b when a console with the switch off did, else C9 to C12 by source.
//
// C13b is decided by the source, not by comparing codes: a console that
// applied --region answers source "chosen", so any other source after an
// explicit --region means it was ignored. Comparing codes misses --region
// <the home> against a switch-off console, which answers the home itself.
//
// An empty region_source with a region present means the console could not
// read the stored region back (it then answers the home with no source). That
// says nothing about whether --region was applied, so it prints nothing: not
// C13b, and not a C9 to C12 line that would name a source nobody knows.
//
// onFleet is true when the create named a fleet (--place fleet/<name>). The
// fleet governs where its instances run, so C13b ("--region was not applied",
// "this app's instances start in <home>") would be wrong: it prints nothing.
func printAppRegion(w io.Writer, res apiCreateAppResult, asked string, onFleet bool) {
	switch {
	case res.Region == "" && res.RegionSource == "":
		if asked != "" {
			fmt.Fprintln(w, regionNotRecordedOldConsole)
		}
	case res.RegionSource == "":
		// Region read-back failed on the console. Say nothing.
	case asked != "" && res.RegionSource != "chosen" && onFleet:
		// The fleet decides placement. Say nothing.
	case asked != "" && res.RegionSource != "chosen":
		fmt.Fprintln(w, regionNotAppliedSwitchOff(res.RegionName))
	case res.RegionsAvailable >= 2:
		fmt.Fprintln(w, regionCreatedLine(res.RegionName, res.RegionSource))
	}
}