package declaration

import (
	"strings"
	"testing"
)

// A resource's health is held to its kind and bounds on arrival, as the controller holds it near the
// author (novox/hq ADR 0240 rule 2): an engine that took a check it could not judge would say a module ready
// that nothing looked at.
func TestAHealthIsHeldToItsKindAndBounds(t *testing.T) {
	pinned := "postgres@sha256:" + strings.Repeat("a", 64)
	parse := func(resource string) error {
		_, err := Parse([]byte(`{"declaration":1,"resources":[` + resource + `]}`))
		return err
	}
	container := func(health string, more string) string {
		return `{"id":"m.db","type":"container","name":"db","image":"` + pinned + `"` + more + `,"health":` + health + `}`
	}
	timing := `"interval":"30s","timeout":"5s","looks":3,"grace":"1m0s"`
	for _, ok := range []string{
		container(`{"kind":"http","endpoint":"web","port":31001,"path":"/",`+timing+`}`, ""),
		container(`{"kind":"exec","command":"pg_isready",`+timing+`}`, ""),
		container(`{"kind":"runtime",`+timing+`}`, ""),
		`{"id":"m.d","type":"service","unit":"d.service","state":"running","health":{"kind":"unit",` + timing + `}}`,
	} {
		if err := parse(ok); err != nil {
			t.Errorf("refused %s: %v", ok, err)
		}
	}
	for _, c := range []struct{ resource, says string }{
		{container(`{"kind":"http","path":"/",`+timing+`}`, ""), "needs the port"},
		{container(`{"kind":"exec",`+timing+`}`, ""), "needs a command"},
		{container(`{"kind":"unit",`+timing+`}`, ""), "a service's or a process's own"},
		{container(`{"kind":"ping",`+timing+`}`, ""), `of kind "ping"`},
		{container(`{"kind":"tcp","port":1,"interval":"5s","timeout":"1s","looks":3,"grace":"0s"}`, ""), "no more often than every 10s"},
		{container(`{"kind":"tcp","port":1,"interval":"30s","timeout":"30s","looks":3,"grace":"0s"}`, ""), "less than its interval"},
		{container(`{"kind":"tcp","port":1,"interval":"30s","timeout":"5s","looks":1,"grace":"0s"}`, ""), "at least 2 failing looks"},
		{container(`{"kind":"tcp","port":1,"interval":"60s","timeout":"5s","looks":3,"grace":"3m"}`, ""), "at most 5m0s"},
		{container(`{"kind":"runtime",`+timing+`}`, `,"run-once":true`), "judged on what stays up"},
		{`{"id":"m.d","type":"service","unit":"d.service","state":"running","health":{"kind":"runtime",` + timing + `}}`, "a container image's own"},
		{container(`{"kind":"tcp","port":1,`+timing+`,"retries":2}`, ""), "retries"},
	} {
		err := parse(c.resource)
		if err == nil || !strings.Contains(err.Error(), c.says) {
			t.Errorf("%s: want a refusal saying %q, got %v", c.resource, c.says, err)
		}
	}
}