package stacks

import (
	"io"
	"log"
	"strings"
	"testing"
)

// R-514 — a worker OOM-killed inside a RUNNING container must be seen. BIGNIGHT: paperless-webserver
// `oomkilled=true restarts=0`, app „Fut", no event.
//
// RED-PROOF (run 2026-09-15, recorded in REPORT.md): with the `f[1] != "true"` filter inverted to
// skip every "true" line, the scan returned nothing and this failed at "OOM-killed worker not seen".
func TestScanOOMKilled_SeesKilledWorkerInRunningContainer(t *testing.T) {
	var gotArgs []string
	m := &Manager{
		logger: log.New(io.Discard, "", 0),
		stacks: map[string]*Stack{
			"paperless-ngx": {Name: "paperless-ngx", Deployed: true, Containers: []ContainerInfo{
				{Name: "paperless-webserver", State: StateRunning},
				{Name: "paperless-redis", State: StateRunning},
			}},
			"bookstack":  {Name: "bookstack", Deployed: true, Containers: []ContainerInfo{{Name: "bookstack", State: StateRunning}}},
			"stopped":    {Name: "stopped", Deployed: true, Containers: []ContainerInfo{{Name: "stopped-c", State: StateExited}}},
			"undeployed": {Name: "undeployed", Deployed: false, Containers: []ContainerInfo{{Name: "u", State: StateRunning}}},
		},
	}
	m.execFn = func(name string, args ...string) (string, error) {
		gotArgs = args
		return "/bookstack|false|2026-09-14T18:00:00Z\n/paperless-redis|false|2026-09-14T18:00:00Z\n/paperless-webserver|true|2026-09-14T18:00:01Z\n", nil
	}
	ooms, err := m.ScanOOMKilled()
	if err != nil {
		t.Fatal(err)
	}
	if len(ooms) != 1 || ooms[0].Stack != "paperless-ngx" || ooms[0].Container != "paperless-webserver" || ooms[0].StartedAt == "" {
		t.Fatalf("OOM-killed worker not seen: %+v", ooms)
	}
	joined := strings.Join(gotArgs, " ")
	if strings.Contains(joined, "stopped-c") || strings.Contains(joined, " u") {
		t.Fatalf("inspected a stopped or undeployed container: %v", gotArgs)
	}
	if got := m.OOMKilledStacks(); len(got["paperless-ngx"]) != 1 || len(got) != 1 {
		t.Fatalf("dashboard cache wrong: %v", got)
	}
	// Next scan clean → cache cleared (a restarted container resets OOMKilled).
	m.execFn = func(string, ...string) (string, error) {
		return "/bookstack|false|x\n/paperless-redis|false|x\n/paperless-webserver|false|y\n", nil
	}
	_, _ = m.ScanOOMKilled()
	if got := m.OOMKilledStacks(); len(got) != 0 {
		t.Fatalf("cache not cleared after a clean scan: %v", got)
	}
}