package web

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

	"golang.org/x/crypto/bcrypt"
)

// take-two F-15 (v0.123.0) — the reset-request response path. The hub returns the freshly rotated
// code state in the reset-request response; the controller applies it through the SAME
// generation-guarded consumer as the report ACK (report.ClaimSync), so the emailed code is
// accepted IMMEDIATELY — no ~15-minute wait for the next ACK.

// fixtureHub serves a canned reset-request response and records that it was hit.
func fixtureHub(t *testing.T, respBody string) (*httptest.Server, *int) {
	t.Helper()
	hits := 0
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/v1/claim/reset-request" {
			t.Errorf("unexpected hub path %s", r.URL.Path)
		}
		if r.Header.Get("Authorization") != "Bearer test-key" {
			t.Errorf("reset-request missing the box's own report key")
		}
		hits++
		w.Header().Set("Content-Type", "application/json")
		fmt.Fprint(w, respBody)
	}))
	t.Cleanup(srv.Close)
	return srv, &hits
}

func (s *Server) postClaim(code, pw string) *httptest.ResponseRecorder {
	form := url.Values{"_csrf": {s.claimCSRFToken()}, "code": {code}, "new_password": {pw}, "confirm_password": {pw}}
	req := httptest.NewRequest(http.MethodPost, "/claim", strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.AddCookie(&http.Cookie{Name: claimCSRFCookie, Value: s.claimCSRFToken()})
	rr := httptest.NewRecorder()
	s.handleClaimSubmit(rr, req)
	return rr
}

// The response's rotated hash is applied in the same request cycle: the NEW code claims the box
// immediately, and the OLD (pre-rotation) code is dead. Red-proof: drop the response handling in
// requestHubResetCode → the immediate acceptance fails ("Hibás vagy lejárt kód").
func TestResetRequest_ResponseHashAppliedImmediately(t *testing.T) {
	s, oldCode, sett := claimTestServer(t)

	newCode := "friss-teszt-kod"
	newHash, _ := bcrypt.GenerateFromPassword([]byte(newCode), 10)
	resp, _ := json.Marshal(map[string]interface{}{
		"status": "ok",
		"claim": map[string]interface{}{
			"code_hash":  string(newHash),
			"generation": 2,
			"issued_at":  time.Now().UTC().Format(time.RFC3339),
		},
	})
	hub, hits := fixtureHub(t, string(resp))
	s.cfg.Hub.URL = hub.URL
	s.cfg.Hub.APIKey = "test-key"

	s.requestHubResetCode() // synchronous here; the handler fires it in a goroutine
	if *hits != 1 {
		t.Fatalf("hub reset-request hits = %d, want 1", *hits)
	}

	// The effect: settings now hold the rotated state (the ACK consumer's exact write).
	gotHash, gotGen, _ := sett.GetClaimCode()
	if gotGen != 2 || gotHash != string(newHash) {
		t.Fatalf("settings after reset-request: gen=%d hash-is-new=%v, want gen 2 with the response hash", gotGen, gotHash == string(newHash))
	}

	// End-to-end: the emailed code works NOW — and the pre-rotation code is dead.
	if rr := s.postClaim(oldCode, "hosszu-jelszo-123"); rr.Code == http.StatusFound {
		t.Fatal("the OLD code still claims the box after rotation")
	}
	if rr := s.postClaim(newCode, "hosszu-jelszo-123"); rr.Code != http.StatusFound {
		t.Fatalf("the NEW code must be accepted immediately, got %d (body: %.200s)", rr.Code, rr.Body.String())
	}
	if !sett.GetClaimed() {
		t.Fatal("box not marked claimed after the immediate-code claim")
	}
}

// Generation guard (reuse, not reimplementation): a replayed/older-generation response must NOT
// downgrade the active hash — the exact non-effect is asserted.
func TestResetRequest_OlderGenerationResponseIsNoOp(t *testing.T) {
	s, _, sett := claimTestServer(t)
	origHash, origGen, origIssued := sett.GetClaimCode() // gen 1 from the harness

	staleHash, _ := bcrypt.GenerateFromPassword([]byte("regi-lejart-kod"), 10)
	resp, _ := json.Marshal(map[string]interface{}{
		"status": "ok",
		"claim": map[string]interface{}{
			"code_hash":  string(staleHash),
			"generation": origGen, // same generation = replay; <= is refused by ClaimSync
			"issued_at":  time.Now().UTC().Format(time.RFC3339),
		},
	})
	hub, _ := fixtureHub(t, string(resp))
	s.cfg.Hub.URL = hub.URL
	s.cfg.Hub.APIKey = "test-key"

	s.requestHubResetCode()

	gotHash, gotGen, gotIssued := sett.GetClaimCode()
	if gotHash != origHash || gotGen != origGen || gotIssued != origIssued {
		t.Fatalf("stale response mutated the active code state: gen %d→%d hash-changed=%v", origGen, gotGen, gotHash != origHash)
	}
}

// An old hub's bare {"status":"ok"} (no claim object) is a clean no-op — mixed-fleet safety.
func TestResetRequest_LegacyHubResponseIsNoOp(t *testing.T) {
	s, _, sett := claimTestServer(t)
	origHash, origGen, _ := sett.GetClaimCode()

	hub, hits := fixtureHub(t, `{"status":"ok"}`)
	s.cfg.Hub.URL = hub.URL
	s.cfg.Hub.APIKey = "test-key"

	s.requestHubResetCode()
	if *hits != 1 {
		t.Fatalf("hub hits = %d, want 1", *hits)
	}
	gotHash, gotGen, _ := sett.GetClaimCode()
	if gotHash != origHash || gotGen != origGen {
		t.Fatal("legacy hub response mutated the code state")
	}
}