package api

import (
	"testing"
	"time"
)

// The two rules in the integrations area that are pure, and therefore the two that can be
// pinned without a database, a Sonarr or a clock. Both are the kind of judgement whose
// failures are invisible from outside: a status word that is merely wrong still renders,
// and a rebuild that never becomes due looks exactly like a working scheduler.

func TestIntegrationStatusResolvesInPriorityOrder(t *testing.T) {
	past := time.Now().Add(-time.Hour)
	recent := time.Now().Add(-time.Minute)

	cases := []struct {
		name string
		view integrationView
		want string
	}{
		{
			// Not configured outranks everything, including a switch left on from a
			// deployment that used to have an address for it.
			name: "unconfigured outranks enabled",
			view: integrationView{Configured: false, Enabled: true},
			want: integrationStatusUnconfigured,
		},
		{
			// Switched off outranks its own history: yesterday's success beside a service
			// nobody is running reads as one that is still working.
			name: "disabled outranks a past failure",
			view: integrationView{
				Configured: true, Enabled: false, LastFailureAt: &past, LastError: "boom",
			},
			want: integrationStatusDisabled,
		},
		{
			name: "running outranks a past failure",
			view: integrationView{
				Configured: true, Enabled: true, Running: true, LastFailureAt: &past,
			},
			want: integrationStatusRunning,
		},
		{
			// A probe that could not reach the service is the most current evidence there
			// is, and outranks a run that happened to succeed before it went away.
			name: "an unreachable probe beats an older success",
			view: integrationView{
				Configured: true, Enabled: true, LastSuccessAt: &past,
				Health: &integrationHealth{CheckedAt: recent, Error: "connection refused"},
			},
			want: integrationStatusError,
		},
		{
			// The comparison that stops one bad night leaving a service red for a month.
			name: "a failure followed by a success is history",
			view: integrationView{
				Configured: true, Enabled: true,
				LastFailureAt: &past, LastSuccessAt: &recent,
			},
			want: integrationStatusHealthy,
		},
		{
			name: "a failure with no success since is the verdict",
			view: integrationView{
				Configured: true, Enabled: true,
				LastSuccessAt: &past, LastFailureAt: &recent, LastError: "401",
			},
			want: integrationStatusError,
		},
		{
			// Neither working nor broken. Claiming either would be a guess, and "healthy"
			// on a service that has never done anything is the more damaging guess.
			name: "nothing has run yet",
			view: integrationView{Configured: true, Enabled: true},
			want: integrationStatusIdle,
		},
	}

	for _, testCase := range cases {
		t.Run(testCase.name, func(t *testing.T) {
			status, label, _ := integrationStatus(testCase.view)
			if status != testCase.want {
				t.Fatalf("status = %q, want %q", status, testCase.want)
			}
			if label == "" {
				t.Fatal("every status must carry something to print")
			}
		})
	}
}

func TestIntegrationStatusExplainsEveryUnhappyAnswer(t *testing.T) {
	// The console prints this sentence and nothing else says why. An unconfigured or
	// disabled row with no explanation is one an operator has to guess at.
	for _, view := range []integrationView{
		{Configured: false},
		{Configured: true, Enabled: false},
		{Configured: true, Enabled: true},
	} {
		if _, _, detail := integrationStatus(view); detail == "" {
			t.Fatalf("no detail for %+v", view)
		}
	}
}

func TestForYouRebuildDue(t *testing.T) {
	location := time.UTC
	at := func(day, hour int) time.Time {
		return time.Date(2026, time.August, day, hour, 30, 0, 0, location)
	}

	// A household that has never rebuilt does not wait until tomorrow evening for its
	// first rows — but it does wait for the hour it was told to use.
	if forYouRebuildDue(nil, at(19, 2), 4) {
		t.Fatal("rebuilt before the household's hour")
	}
	if !forYouRebuildDue(nil, at(19, 4), 4) {
		t.Fatal("a household that has never rebuilt is due at its hour")
	}

	// Once today's rebuild has happened it is not due again today, however many times the
	// hourly task asks. This is the whole of what stops the heaviest job in the gateway
	// running twenty times an evening.
	today := at(19, 4)
	if forYouRebuildDue(&today, at(19, 23), 4) {
		t.Fatal("rebuilt twice in one day")
	}
	tomorrow := at(20, 4)
	if !forYouRebuildDue(&today, tomorrow, 4) {
		t.Fatal("not due on the next day")
	}

	// The boundary is the local calendar day, not "24 hours ago". A rebuild at 04:30 and
	// a tick at 04:00 the next morning are 23.5 hours apart and are still two days.
	if !forYouRebuildDue(&today, at(20, 4), 4) {
		t.Fatal("an interval shorter than 24 hours must still be a new day")
	}

	// An hour outside the clock is read as midnight rather than as a reason never to run.
	if !forYouRebuildDue(nil, at(19, 0), 99) {
		t.Fatal("an out-of-range hour must not strand the rebuild")
	}
}