package osupdates

import (
	"log"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"gitea.dooplex.hu/admin/felhom-hub/internal/store"
)

type fix struct {
	s      *Service
	now    time.Time
	events []string
	bumps  []string
}

func newFix(t *testing.T) *fix {
	t.Helper()
	st, err := store.New(filepath.Join(t.TempDir(), "hub.db"), log.New(os.Stderr, "", 0))
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { st.Close() })
	for _, h := range []struct{ host, cust string }{{"hp", "c-hp"}, {"n100", "c-n100"}, {"cust1", "c-1"}} {
		if err := st.UpsertHost(&store.Host{HostID: h.host, CustomerID: h.cust, APIKey: "k-" + h.host}); err != nil {
			t.Fatal(err)
		}
	}
	f := &fix{now: time.Date(2026, 10, 4, 12, 0, 0, 0, time.UTC)}
	f.s = &Service{Store: st, ApproveAfter: 24 * time.Hour, NightsRequired: 1, Now: func() time.Time { return f.now },
		Emit: func(_, typ, _, _, _, _ string) { f.events = append(f.events, typ) },
		Bump: func(h string) { f.bumps = append(f.bumps, h) }}
	_ = st.SetOSRing("hp", 0)
	_ = st.SetOSRing("n100", 0)
	return f
}

func pk(name, ver string) Package { return Package{Name: name, Version: ver, Origin: "Debian"} }

func (f *fix) report(t *testing.T, host, trigger string, healthy bool, pkgs ...Package) {
	t.Helper()
	outcome := "applied"
	if !healthy {
		outcome = "health_failed"
	}
	if err := f.s.Ingest(host, Report{RunID: host + trigger + f.now.String(), Trigger: trigger, Mode: "apply", Outcome: outcome,
		Healthy: healthy, Installed: pkgs, Upgraded: pkgs[:1]}); err != nil {
		t.Fatal(err)
	}
}

// The ruled wait: approved only after every ring-0 box ran the set healthy for ApproveAfter AND through a night run.
// Red-proof: drop the age check, the healthy check or the nights check in Evaluate and a sub-step fails.
func TestApproval_WaitHealthyAndOneNight(t *testing.T) {
	f := newFix(t)
	set := []Package{pk("libc6", "2.41-12+deb13u4"), pk("openssl", "3.5.7-1~deb13u3")}
	f.report(t, "hp", "debug", true, set...)
	f.report(t, "n100", "debug", true, set...)
	st, _ := f.s.Evaluate()
	if !strings.HasPrefix(st.Waiting, "healthy for") {
		t.Fatalf("fresh set approved or wrong reason: %+v", st)
	}
	f.now = f.now.Add(25 * time.Hour)
	st, _ = f.s.Evaluate()
	if !strings.Contains(st.Waiting, "night run") {
		t.Fatalf("approved without a night run: %+v", st)
	}
	f.report(t, "hp", "night", true, set...)
	f.report(t, "n100", "night", true, set...)
	if _, err := f.s.Evaluate(); err != nil {
		t.Fatal(err)
	}
	rel, _ := f.s.Store.LatestOSRelease()
	if rel == nil || rel.ApprovedBy != "auto" {
		t.Fatalf("not approved: %+v", rel)
	}
	if len(f.bumps) != 1 || f.bumps[0] != "cust1" {
		t.Fatalf("only the ring-1 box must be nudged, got %v", f.bumps)
	}
	b := f.s.DesiredBlock("cust1")
	if b.Ring != 1 || !b.Enabled || b.Release == nil || len(b.Release.Packages) != 2 || b.Release.Snapshot != rel.ApprovedAt.UTC().Format("20060102T150405Z") {
		t.Fatalf("ring-1 block = %+v", b)
	}
	if hb := f.s.DesiredBlock("hp"); hb.Ring != 0 || hb.Release != nil {
		t.Fatalf("a ring-0 box must not get a release (it installs everything pending): %+v", hb)
	}
}

func TestApproval_UnhealthyRunBlocks(t *testing.T) {
	f := newFix(t)
	set := []Package{pk("libc6", "2.41-12+deb13u4")}
	f.report(t, "hp", "debug", true, set...)
	f.report(t, "n100", "debug", true, set...)
	f.s.Evaluate()
	f.now = f.now.Add(25 * time.Hour)
	f.report(t, "hp", "night", false, set...)
	f.report(t, "n100", "night", true, set...)
	st, _ := f.s.Evaluate()
	if rel, _ := f.s.Store.LatestOSRelease(); rel != nil {
		t.Fatalf("approved although a ring-0 run was not healthy: %+v", st)
	}
	if !strings.Contains(st.Waiting, "healthy=false") {
		t.Fatalf("reason = %q", st.Waiting)
	}
	found := false
	for _, e := range f.events {
		found = found || e == EventHealthFailed
	}
	if !found {
		t.Fatalf("no %s event: %v", EventHealthFailed, f.events)
	}
}

// Ring 0 disagreeing on a package: that package is left out of the candidate (C9 — approve what ALL ring 0 runs).
func TestCandidate_DisagreementLeftOut(t *testing.T) {
	f := newFix(t)
	f.report(t, "hp", "night", true, pk("libc6", "2.41-12+deb13u4"), pk("curl", "8.14.1-2+deb13u5"))
	f.report(t, "n100", "night", true, pk("libc6", "2.41-12+deb13u4"), pk("curl", "8.14.1-2+deb13u4"))
	cand, _, err := f.s.candidate([]string{"hp", "n100"})
	if err != nil {
		t.Fatal(err)
	}
	if _, ok := cand["curl"]; ok || cand["libc6"].Version != "2.41-12+deb13u4" {
		t.Fatalf("candidate = %+v", cand)
	}
}

// Non-Debian origins never enter a release (the fast lane is Debian / Debian-Security only, C3).
func TestCandidate_OnlyDebianOrigins(t *testing.T) {
	f := newFix(t)
	d := Package{Name: "docker-ce", Version: "5:29.8.2", Origin: "Docker"}
	f.report(t, "hp", "night", true, pk("libc6", "x1"), d)
	f.report(t, "n100", "night", true, pk("libc6", "x1"), d)
	cand, _, _ := f.s.candidate([]string{"hp", "n100"})
	if _, ok := cand["docker-ce"]; ok {
		t.Fatal("a Docker package entered the candidate")
	}
}

func TestApproveNow_IsAnOperatorEvent(t *testing.T) {
	f := newFix(t)
	f.report(t, "hp", "debug", true, pk("libc6", "x1"))
	f.report(t, "n100", "debug", true, pk("libc6", "x1"))
	id, err := f.s.ApproveNow()
	if err != nil || id == "" {
		t.Fatalf("%q %v", id, err)
	}
	rel, _ := f.s.Store.LatestOSRelease()
	if rel.ApprovedBy != "operator" {
		t.Fatalf("approved_by = %q", rel.ApprovedBy)
	}
	n := 0
	for _, e := range f.events {
		if e == EventApprovedNow {
			n++
		}
	}
	if n != 1 {
		t.Fatalf("want one %s, got %v", EventApprovedNow, f.events)
	}
}

func TestSwitchAndRing(t *testing.T) {
	f := newFix(t)
	if err := f.s.SetEnabled("cust1", false); err != nil {
		t.Fatal(err)
	}
	if b := f.s.DesiredBlock("cust1"); b.Enabled {
		t.Fatal("switch OFF not delivered")
	}
	if err := f.s.SetRing("cust1", 2); err == nil {
		t.Fatal("ring 2 accepted")
	}
	if b := f.s.DesiredBlock("nobody-row"); b.Ring != 1 || !b.Enabled {
		t.Fatalf("default must be ring 1, ON: %+v", b)
	}
}

func TestIngest_AppliedIsTheHouseholdsLine(t *testing.T) {
	f := newFix(t)
	f.report(t, "cust1", "night", true, pk("libc6", "x1"))
	if len(f.events) != 1 || f.events[0] != EventApplied {
		t.Fatalf("events = %v", f.events)
	}
}