package web

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"

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

// seedReport writes a latest report carrying a controller version for customerID.
func seedReport(t *testing.T, st *store.Store, customerID, ctrlVer string) {
	t.Helper()
	if err := st.SaveReport(customerID, []byte(`{"controller_version":"`+ctrlVer+`"}`)); err != nil {
		t.Fatalf("SaveReport(%s): %v", customerID, err)
	}
}

// TestManifestSave_DoesNotTouchFloor is Part C's central guarantee: saving the Day-0 artifact
// manifest must NOT write hub_settings.min_controller_version (the publish-train footgun). Companion
// red-proof: add a SetGlobalMinControllerVersion call into handleSetArtifacts → the floor changes →
// this fails.
func TestManifestSave_DoesNotTouchFloor(t *testing.T) {
	s, st := newTestServer(t)
	st.SetDefaultMinControllerVersion("0.87.0")
	if err := st.SetGlobalMinControllerVersion("0.113.0"); err != nil {
		t.Fatal(err)
	}
	before := st.ResolveGlobalFloor()

	form := url.Values{"agent_version": {"0.82.0"}, "golden_version": {"0.115.0"}}
	// No Gitea client in the test → resolveArtifactSHA takes the manual path; provide valid shas.
	form.Set("agent_sha256", strings.Repeat("a", 64))
	form.Set("golden_sha256", strings.Repeat("b", 64))
	r := httptest.NewRequest(http.MethodPost, "/configuration/artifacts", strings.NewReader(form.Encode()))
	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()
	s.handleSetArtifacts(w, r)

	if m := st.GetArtifactManifest(); m.AgentVersion != "0.82.0" || m.GoldenVersion != "0.115.0" {
		t.Fatalf("manifest not saved: %+v", m)
	}
	after := st.ResolveGlobalFloor()
	if after.Effective != before.Effective || after.Source != before.Source || after.DBValue != before.DBValue {
		t.Errorf("manifest save MUST NOT change the floor: before=%+v after=%+v", before, after)
	}
}

// TestGlobalFloorImpact_Count: the confirm-dialog probe counts boxes below a proposed floor,
// honoring per-customer overrides (an overridden box is governed by its own floor, not the proposed
// global). Companion red-proof: drop the override exclusion → the overridden box is miscounted.
func TestGlobalFloorImpact_Count(t *testing.T) {
	s, st := newTestServer(t)
	// Three reporting boxes.
	seedReport(t, st, "below-a", "0.110.0")   // below a 0.113 proposal
	seedReport(t, st, "below-b", "0.112.0")   // below
	seedReport(t, st, "current", "0.113.0")   // at the proposal (not below)
	seedReport(t, st, "overridden", "0.90.0") // below the global BUT has its own override at 0.90.0
	if err := st.SaveCustomerConfig(&store.CustomerConfig{CustomerID: "overridden", RetrievalPassword: "x", APIKey: "y"}); err != nil {
		t.Fatal(err)
	}
	if err := st.SetMinControllerVersion("overridden", "0.90.0"); err != nil {
		t.Fatal(err)
	}

	req := httptest.NewRequest(http.MethodGet, "/configuration/global-floor/impact?v=0.113.0", nil)
	w := httptest.NewRecorder()
	s.handleGlobalFloorImpact(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("impact: %d", w.Code)
	}
	var resp struct {
		Version string `json:"version"`
		Valid   bool   `json:"valid"`
		Below   int    `json:"below"`
	}
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatal(err)
	}
	if !resp.Valid || resp.Version != "0.113.0" {
		t.Fatalf("resp = %+v", resp)
	}
	// below-a + below-b = 2; current is AT the floor; overridden is governed by its own 0.90.0.
	if resp.Below != 2 {
		t.Errorf("below-floor count = %d, want 2 (overridden box excluded, at-floor excluded)", resp.Below)
	}

	// Invalid version → valid:false, below:0.
	req2 := httptest.NewRequest(http.MethodGet, "/configuration/global-floor/impact?v=notaversion", nil)
	w2 := httptest.NewRecorder()
	s.handleGlobalFloorImpact(w2, req2)
	var resp2 struct {
		Valid bool `json:"valid"`
		Below int  `json:"below"`
	}
	_ = json.Unmarshal(w2.Body.Bytes(), &resp2)
	if resp2.Valid || resp2.Below != 0 {
		t.Errorf("invalid version → valid=false below=0, got %+v", resp2)
	}
}

// TestConfigurationPage_RendersFloorSource: the effective-floor source line renders both the
// DB-wins and env-fallback states through the production template.
func TestConfigurationPage_RendersFloorSource(t *testing.T) {
	render := func(setup func(st *store.Store)) string {
		t.Helper()
		s, st := newTestServer(t)
		setup(st)
		req := httptest.NewRequest(http.MethodGet, "/configuration", nil)
		w := httptest.NewRecorder()
		s.handleConfiguration(w, req)
		if w.Code != http.StatusOK {
			t.Fatalf("configuration page: %d", w.Code)
		}
		return w.Body.String()
	}

	dbWins := render(func(st *store.Store) {
		st.SetDefaultMinControllerVersion("0.87.0")
		_ = st.SetGlobalMinControllerVersion("0.113.0")
	})
	if !strings.Contains(dbWins, "DB (hub_settings)") || !strings.Contains(dbWins, "v0.113.0") {
		t.Errorf("db-wins source line missing:\n%s", excerpt(dbWins))
	}
	if !strings.Contains(dbWins, "env fallback would be") || !strings.Contains(dbWins, "v0.87.0") {
		t.Errorf("db-wins must also surface the env fallback value:\n%s", excerpt(dbWins))
	}

	envOnly := render(func(st *store.Store) { st.SetDefaultMinControllerVersion("0.87.0") })
	if !strings.Contains(envOnly, "env fallback (DEFAULT_MIN_CONTROLLER_VERSION)") {
		t.Errorf("env-fallback source line missing:\n%s", excerpt(envOnly))
	}
	// The type-to-confirm wiring must be present (no bare submit button).
	if !strings.Contains(envOnly, "confirmGlobalFloor()") || !strings.Contains(envOnly, "global-floor/impact") {
		t.Errorf("type-to-confirm dialog wiring missing")
	}
}

func excerpt(s string) string {
	if i := strings.Index(s, "Managed updates"); i >= 0 {
		end := i + 900
		if end > len(s) {
			end = len(s)
		}
		return s[i:end]
	}
	if len(s) > 600 {
		return s[:600]
	}
	return s
}

// ── R-120: the vouch path REFUSES a golden older than the controller the fleet already runs ──────
//
// These drive handleSetArtifacts — THE production vouch path, the only UI writer of
// SetArtifactManifest — over httptest. Deliberately NOT through an injected seam: the whole point of
// this gate is that it cannot be inert, and three shipped defects in this project were fully green
// with the seam disconnected. The assertions check BOTH the operator-visible outcome and that the
// manifest was not written, because a gate that redirects but still saves is worse than none.

// RED-PROOF: delete the `goldenVer != ""` gate block in handleSetArtifacts → this fails, because the
// stale golden is accepted and the manifest is overwritten.
func TestVouchRefusesGoldenBehindFleet(t *testing.T) {
	s, st := newTestServer(t)
	// The R-120 situation exactly: a box is running 0.186.0 while the operator vouches a 0.185.1 golden.
	seedReport(t, st, "demo", "0.186.0")
	if err := st.SetArtifactManifest(store.ArtifactManifest{
		AgentVersion: "0.116.0", GoldenVersion: "0.186.0",
		AgentSHA256: strings.Repeat("a", 64), GoldenSHA256: strings.Repeat("b", 64),
	}); err != nil {
		t.Fatal(err)
	}

	form := url.Values{"agent_version": {"0.116.0"}, "golden_version": {"0.185.1"}}
	form.Set("agent_sha256", strings.Repeat("c", 64))
	form.Set("golden_sha256", strings.Repeat("d", 64))
	r := httptest.NewRequest(http.MethodPost, "/configuration/artifacts", strings.NewReader(form.Encode()))
	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()
	s.handleSetArtifacts(w, r)

	if got := w.Header().Get("Location"); !strings.Contains(got, "golden_behind_fleet") {
		t.Errorf("expected the refusal flash, got Location=%q — the operator would not know it was refused", got)
	}
	// The load-bearing half: the manifest must be UNCHANGED.
	if m := st.GetArtifactManifest(); m.GoldenVersion != "0.186.0" {
		t.Fatalf("REFUSED but still wrote the manifest: golden=%q, want 0.186.0 untouched. A gate that "+
			"redirects and saves anyway is worse than no gate — it reads as enforcement.", m.GoldenVersion)
	}
}

// The gate must not block legitimate vouches, or it gets disabled and becomes another R-29 orphan.
func TestVouchAllowsGoldenAtOrAheadOfFleet(t *testing.T) {
	s, st := newTestServer(t)
	seedReport(t, st, "demo", "0.186.0")
	for _, golden := range []string{"0.186.0", "0.187.0"} {
		form := url.Values{"agent_version": {"0.116.0"}, "golden_version": {golden}}
		form.Set("agent_sha256", strings.Repeat("a", 64))
		form.Set("golden_sha256", strings.Repeat("b", 64))
		r := httptest.NewRequest(http.MethodPost, "/configuration/artifacts", strings.NewReader(form.Encode()))
		r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
		w := httptest.NewRecorder()
		s.handleSetArtifacts(w, r)
		if m := st.GetArtifactManifest(); m.GoldenVersion != golden {
			t.Errorf("golden %s (>= fleet 0.186.0) should be vouchable, manifest holds %q", golden, m.GoldenVersion)
		}
	}
}

// Fail-open case 1: a hub whose fleet has reported nothing must be able to vouch its first golden.
func TestVouchAllowedWhenFleetVersionUnknown(t *testing.T) {
	s, st := newTestServer(t)
	form := url.Values{"agent_version": {"0.116.0"}, "golden_version": {"0.185.1"}}
	form.Set("agent_sha256", strings.Repeat("a", 64))
	form.Set("golden_sha256", strings.Repeat("b", 64))
	r := httptest.NewRequest(http.MethodPost, "/configuration/artifacts", strings.NewReader(form.Encode()))
	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()
	s.handleSetArtifacts(w, r)
	if m := st.GetArtifactManifest(); m.GoldenVersion != "0.185.1" {
		t.Errorf("with no reported fleet version the gate must fail OPEN; manifest holds %q", m.GoldenVersion)
	}
}

// Fail-open case 2: clearing the golden field is a legitimate operator act, not drift.
func TestVouchAllowsClearingGolden(t *testing.T) {
	s, st := newTestServer(t)
	seedReport(t, st, "demo", "0.186.0")
	form := url.Values{"agent_version": {"0.116.0"}, "golden_version": {""}}
	form.Set("agent_sha256", strings.Repeat("a", 64))
	r := httptest.NewRequest(http.MethodPost, "/configuration/artifacts", strings.NewReader(form.Encode()))
	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()
	s.handleSetArtifacts(w, r)
	if got := w.Header().Get("Location"); strings.Contains(got, "golden_behind_fleet") {
		t.Error("clearing the golden must not trip the gate")
	}
}

// The comparison must be SEMVER, not lexical — 0.99.0 vs 0.186.0 is the pair that breaks string order,
// and it is not hypothetical: the fleet has shipped both 0.9x and 0.18x controllers.
func TestNewestReportedControllerIsSemverOrdered(t *testing.T) {
	_, st := newTestServer(t)
	seedReport(t, st, "a", "0.99.0")
	seedReport(t, st, "b", "0.186.0")
	if got := st.NewestReportedControllerVersion(); got != "0.186.0" {
		t.Errorf("NewestReportedControllerVersion() = %q, want 0.186.0 — a lexical MAX() would return 0.99.0", got)
	}
}