package http

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

	"gitea.dcglab.co.uk/steve/restic-manager/internal/store"
)

func TestAPIUsersList(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	makeUser(t, srv, "op1", store.RoleOperator)
	cookie := loginAs(t, srv, adminID)

	req, _ := stdhttp.NewRequest("GET", ts.URL+"/api/users", nil)
	req.AddCookie(cookie)
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("GET: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		body, _ := io.ReadAll(res.Body)
		t.Fatalf("status: got %d body=%s", res.StatusCode, body)
	}
	var got listUsersResponse
	_ = json.NewDecoder(res.Body).Decode(&got)
	if len(got.Users) != 2 {
		t.Errorf("count: got %d want 2", len(got.Users))
	}
}

func TestAPIUserCreate(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	cookie := loginAs(t, srv, adminID)

	body, _ := json.Marshal(map[string]any{
		"username": "Bob", "email": "bob@example.com", "role": "operator",
	})
	req, _ := stdhttp.NewRequest("POST", ts.URL+"/api/users", bytes.NewReader(body))
	req.AddCookie(cookie)
	req.Header.Set("Content-Type", "application/json")
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("POST: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusCreated {
		body, _ := io.ReadAll(res.Body)
		t.Fatalf("status: got %d body=%s", res.StatusCode, body)
	}
	var got struct {
		ID       string `json:"id"`
		SetupURL string `json:"setup_url"`
	}
	_ = json.NewDecoder(res.Body).Decode(&got)
	if got.ID == "" || got.SetupURL == "" {
		t.Errorf("missing fields: %+v", got)
	}
	if !strings.Contains(got.SetupURL, "/setup?token=") {
		t.Errorf("setup_url shape: %q", got.SetupURL)
	}

	// Verify lowercase-normalised.
	u, err := srv.deps.Store.GetUserByUsername(t.Context(), "bob")
	if err != nil {
		t.Fatalf("get: %v", err)
	}
	if u.Username != "bob" {
		t.Errorf("username: got %q want bob", u.Username)
	}
	if !u.MustChangePassword {
		t.Error("must_change_password not set")
	}
}

func TestAPIUserCreateRejectsDuplicateEnabled(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	makeUser(t, srv, "alice", store.RoleOperator)
	cookie := loginAs(t, srv, adminID)

	body, _ := json.Marshal(map[string]any{
		"username": "ALICE", "role": "operator",
	})
	req, _ := stdhttp.NewRequest("POST", ts.URL+"/api/users", bytes.NewReader(body))
	req.AddCookie(cookie)
	req.Header.Set("Content-Type", "application/json")
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("POST: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusConflict {
		t.Errorf("status: got %d want 409", res.StatusCode)
	}
}

func TestAPIUserGet(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	target := makeUser(t, srv, "carol", store.RoleViewer)
	cookie := loginAs(t, srv, adminID)

	req, _ := stdhttp.NewRequest("GET", ts.URL+"/api/users/"+target, nil)
	req.AddCookie(cookie)
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("GET: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		t.Errorf("status: got %d", res.StatusCode)
	}
}

func TestAPIUserPatchRoleAndEmail(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	target := makeUser(t, srv, "carol", store.RoleViewer)
	cookie := loginAs(t, srv, adminID)

	body, _ := json.Marshal(map[string]any{
		"role": "operator", "email": "carol@example.com",
	})
	req, _ := stdhttp.NewRequest("PATCH", ts.URL+"/api/users/"+target, bytes.NewReader(body))
	req.AddCookie(cookie)
	req.Header.Set("Content-Type", "application/json")
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("PATCH: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		body, _ := io.ReadAll(res.Body)
		t.Errorf("status: got %d body=%s", res.StatusCode, body)
	}
	got, _ := srv.deps.Store.GetUserByID(t.Context(), target)
	if got.Role != store.RoleOperator {
		t.Errorf("role: got %q", got.Role)
	}
	if got.Email == nil || *got.Email != "carol@example.com" {
		t.Errorf("email: got %v", got.Email)
	}
}

func TestAPIUserPatchRejectsLastAdminDemote(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	cookie := loginAs(t, srv, adminID)

	body, _ := json.Marshal(map[string]any{"role": "viewer"})
	req, _ := stdhttp.NewRequest("PATCH", ts.URL+"/api/users/"+adminID, bytes.NewReader(body))
	req.AddCookie(cookie)
	req.Header.Set("Content-Type", "application/json")
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("PATCH: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusConflict {
		t.Errorf("status: got %d want 409", res.StatusCode)
	}
}

func TestAPIUserDisable(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	makeUser(t, srv, "admin2", store.RoleAdmin) // satisfy last-admin guard
	target := makeUser(t, srv, "victim", store.RoleOperator)
	cookie := loginAs(t, srv, adminID)

	req, _ := stdhttp.NewRequest("POST", ts.URL+"/api/users/"+target+"/disable", nil)
	req.AddCookie(cookie)
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("POST: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		t.Errorf("status: got %d", res.StatusCode)
	}
	u, _ := srv.deps.Store.GetUserByID(t.Context(), target)
	if u.DisabledAt == nil {
		t.Error("disabled_at not set")
	}
}

func TestAPIUserDisableRejectsLastAdmin(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	cookie := loginAs(t, srv, adminID)

	req, _ := stdhttp.NewRequest("POST", ts.URL+"/api/users/"+adminID+"/disable", nil)
	req.AddCookie(cookie)
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("POST: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusConflict {
		t.Errorf("status: got %d want 409", res.StatusCode)
	}
}

func TestAPIUserRegenerateSetup(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	target := makeUser(t, srv, "newbie", store.RoleViewer)
	_ = srv.deps.Store.SetMustChangePassword(t.Context(), target, true)
	_ = srv.deps.Store.SetSetupToken(t.Context(), store.SetupToken{
		UserID: target, TokenHash: "old", ExpiresAt: time.Now().UTC().Add(time.Hour),
		CreatedAt: time.Now().UTC(),
	})
	cookie := loginAs(t, srv, adminID)

	req, _ := stdhttp.NewRequest("POST", ts.URL+"/api/users/"+target+"/regenerate-setup", nil)
	req.AddCookie(cookie)
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("POST: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		t.Errorf("status: got %d", res.StatusCode)
	}
	var got struct {
		SetupURL string `json:"setup_url"`
	}
	_ = json.NewDecoder(res.Body).Decode(&got)
	if !strings.Contains(got.SetupURL, "/setup?token=") {
		t.Errorf("setup_url: %q", got.SetupURL)
	}
	if _, err := srv.deps.Store.LookupSetupToken(t.Context(), "old"); err == nil {
		t.Error("old token should be replaced")
	}
}

func TestAPIUserForceLogout(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	adminID := makeUser(t, srv, "admin1", store.RoleAdmin)
	target := makeUser(t, srv, "victim", store.RoleOperator)
	loginAs(t, srv, target) // create a session for the victim
	cookie := loginAs(t, srv, adminID)

	req, _ := stdhttp.NewRequest("POST", ts.URL+"/api/users/"+target+"/force-logout", nil)
	req.AddCookie(cookie)
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("POST: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		t.Errorf("status: got %d", res.StatusCode)
	}
	rr, _ := srv.deps.Store.DeleteSessionsByUserID(t.Context(), target)
	if rr != 0 {
		t.Errorf("expected 0 remaining sessions, got %d", rr)
	}
}

func TestAPIAccountPasswordChange(t *testing.T) {
	t.Parallel()
	srv, ts, _ := rawTestServerWithUI(t)
	uid := makeUser(t, srv, "alice", store.RoleViewer)
	cookie := loginAs(t, srv, uid)

	body, _ := json.Marshal(map[string]string{
		"current_password": "test-password",
		"new_password":     "averylongpassword",
	})
	req, _ := stdhttp.NewRequest("POST", ts.URL+"/api/account/password", bytes.NewReader(body))
	req.AddCookie(cookie)
	req.Header.Set("Content-Type", "application/json")
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("POST: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		body, _ := io.ReadAll(res.Body)
		t.Errorf("status: got %d body=%s", res.StatusCode, body)
	}
}