package httpapi

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

	"github.com/descrybe/descrybe-v2/apps/api/internal/auth"
	"github.com/descrybe/descrybe-v2/apps/api/internal/mail"
)

func TestHandleForgotPasswordMailerRequired(t *testing.T) {
	t.Parallel()
	s := &Server{Auth: &auth.Service{}}
	req := httptest.NewRequest(http.MethodPost, "/api/auth/forgot-password", bytes.NewBufferString(`{"email":"a@example.com"}`))
	rec := httptest.NewRecorder()
	s.handleForgotPassword(rec, req)
	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("status=%d want 503", rec.Code)
	}
}

func TestHandleForgotPasswordRequiresEmail(t *testing.T) {
	t.Parallel()
	s := &Server{
		Mail: &recordingMailer{enabled: true},
		Auth: &auth.Service{},
	}
	req := httptest.NewRequest(http.MethodPost, "/api/auth/forgot-password", bytes.NewBufferString(`{"email":"  "}`))
	rec := httptest.NewRecorder()
	s.handleForgotPassword(rec, req)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status=%d want 400 body=%s", rec.Code, rec.Body.String())
	}
}

func TestHandleForgotPasswordIPRateLimited(t *testing.T) {
	t.Parallel()
	s := &Server{
		Mail: &recordingMailer{enabled: true},
		Auth: &auth.Service{},
	}
	s.ensureForgotPasswordLimiters()
	s.forgotPasswordIPRL = newSlidingWindowLimiter(1, time.Minute)
	s.forgotPasswordEmailRL = newSlidingWindowLimiter(10, time.Hour)
	key := "forgot-password-ip:203.0.113.50:1"
	if !s.forgotPasswordIPRL.allow(key) {
		t.Fatal("setup: expected first allow")
	}

	req := httptest.NewRequest(http.MethodPost, "/api/auth/forgot-password", bytes.NewBufferString(`{"email":"user@example.com"}`))
	req.RemoteAddr = "203.0.113.50:1"
	rec := httptest.NewRecorder()
	s.handleForgotPassword(rec, req)
	if rec.Code != http.StatusTooManyRequests {
		t.Fatalf("status=%d want 429 body=%s", rec.Code, rec.Body.String())
	}
	if rec.Header().Get("Retry-After") == "" {
		t.Fatal("expected Retry-After")
	}
	if strings.Contains(rec.Body.String(), "@") {
		t.Fatalf("rate-limit body must not include email: %s", rec.Body.String())
	}
}

func TestHandleForgotPasswordEmailRateLimited(t *testing.T) {
	t.Parallel()
	s := &Server{
		Mail: &recordingMailer{enabled: true},
		Auth: &auth.Service{},
	}
	s.ensureForgotPasswordLimiters()
	s.forgotPasswordIPRL = newSlidingWindowLimiter(10, time.Minute)
	s.forgotPasswordEmailRL = newSlidingWindowLimiter(1, time.Hour)
	emailKey := "forgot-password-email:user@example.com"
	if !s.forgotPasswordEmailRL.allow(emailKey) {
		t.Fatal("setup: expected first allow")
	}

	req := httptest.NewRequest(http.MethodPost, "/api/auth/forgot-password", bytes.NewBufferString(`{"email":"User@Example.com"}`))
	req.RemoteAddr = "198.51.100.10:9"
	rec := httptest.NewRecorder()
	s.handleForgotPassword(rec, req)
	if rec.Code != http.StatusTooManyRequests {
		t.Fatalf("status=%d want 429 body=%s", rec.Code, rec.Body.String())
	}
	if rec.Header().Get("Retry-After") == "" {
		t.Fatal("expected Retry-After")
	}
	if strings.Contains(rec.Body.String(), "@") {
		t.Fatalf("rate-limit body must not include email: %s", rec.Body.String())
	}
}

func TestHandleResetPasswordAuthRequired(t *testing.T) {
	t.Parallel()
	s := &Server{}
	req := httptest.NewRequest(http.MethodPost, "/api/auth/reset-password", bytes.NewBufferString(`{"token":"x","password":"password12"}`))
	rec := httptest.NewRecorder()
	s.handleResetPassword(rec, req)
	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("status=%d want 503", rec.Code)
	}
}

func TestHandleForgotPasswordSkipsSyntheticEmail(t *testing.T) {
	t.Parallel()
	mailer := &recordingMailer{enabled: true}
	// No Pool: IssuePasswordReset must refuse @legacy.local before any DB access.
	s := &Server{
		Mail: mailer,
		Auth: &auth.Service{},
	}
	req := httptest.NewRequest(http.MethodPost, "/api/auth/forgot-password",
		bytes.NewBufferString(`{"email":"  Synth_User@Legacy.Local "}`))
	req.RemoteAddr = "203.0.113.83:1"
	rec := httptest.NewRecorder()
	s.handleForgotPassword(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("status=%d want 200 body=%s", rec.Code, rec.Body.String())
	}
	var opaque map[string]string
	if err := json.Unmarshal(rec.Body.Bytes(), &opaque); err != nil {
		t.Fatalf("json: %v", err)
	}
	if opaque["status"] != "ok" {
		t.Fatalf("opaque=%v", opaque)
	}
	if strings.Contains(rec.Body.String(), "legacy.local") || strings.Contains(rec.Body.String(), "synth") {
		t.Fatalf("response must not leak synthetic email: %s", rec.Body.String())
	}
	if len(mailer.sent) != 0 {
		t.Fatalf("synthetic emails must not receive mail, got %d", len(mailer.sent))
	}
}

func TestForgotPasswordMessageLink(t *testing.T) {
	t.Parallel()
	msg := mail.ForgotPasswordMessage("http://localhost:5174/", "a@example.com", "tok123")
	if msg.To != "a@example.com" {
		t.Fatalf("to=%q", msg.To)
	}
	if !strings.Contains(msg.Text, "/reset-password#token=tok123") {
		t.Fatalf("text missing reset link: %s", msg.Text)
	}
	if strings.Contains(msg.Text, "/accept-invite") {
		t.Fatal("forgot-password mail must not use accept-invite")
	}
	if msg.Subject != "Reset your Descrybe password" {
		t.Fatalf("subject=%q", msg.Subject)
	}
}