// ui_host_delete_test.go — covers the admin-band danger-zone host
// delete handler: hostname-confirm gate, RBAC, FK cascade, redirect,
// audit.
package http

import (
	"context"
	"errors"
	stdhttp "net/http"
	"net/url"
	"strings"
	"testing"
	"time"

	"github.com/oklog/ulid/v2"

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

// loginAsRole mints a fresh user of the given role and returns a
// session cookie. Local twin to keep the RBAC test self-contained
// without leaking yet another helper into the shared test package.
func loginAsRole(t *testing.T, st *store.Store, role store.Role) *stdhttp.Cookie {
	t.Helper()
	ctx := context.Background()
	uid := ulid.Make().String()
	hash, _ := auth.HashPassword("very-long-test-password")
	if err := st.CreateUser(ctx, store.User{
		ID: uid, Username: string(role) + "-" + uid[:6],
		PasswordHash: hash, Role: role,
		CreatedAt: time.Now().UTC(),
	}); err != nil {
		t.Fatalf("create user: %v", err)
	}
	tok, _ := auth.NewToken()
	if err := st.CreateSession(ctx, store.Session{
		UserID:    uid,
		CreatedAt: time.Now().UTC(),
		ExpiresAt: time.Now().Add(time.Hour).UTC(),
	}, auth.HashToken(tok)); err != nil {
		t.Fatalf("create session: %v", err)
	}
	return &stdhttp.Cookie{Name: sessionCookieName, Value: tok}
}

// TestHostDeleteWrongHostnameRejected: typing a different name must
// not delete the host. Handler returns 400 and the row is intact.
func TestHostDeleteWrongHostnameRejected(t *testing.T) {
	t.Parallel()
	_, ts, st := rawTestServerWithUI(t)
	hostID, _ := enrolHostForUI(t, nil, st, "del-wrong-host")

	cookie := loginAsAdmin(t, st)

	form := url.Values{"confirm_hostname": {"NOT-THE-NAME"}}
	req, _ := stdhttp.NewRequest("POST", ts.URL+"/hosts/"+hostID+"/delete",
		strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.AddCookie(cookie)
	res, err := stdhttp.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("do: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusBadRequest {
		t.Fatalf("status: got %d, want 400", res.StatusCode)
	}
	if _, err := st.GetHost(context.Background(), hostID); err != nil {
		t.Fatalf("host should still exist; got %v", err)
	}
}

// TestHostDeleteRequiresAdmin: a viewer or operator gets 403 — host
// stays intact.
func TestHostDeleteRequiresAdmin(t *testing.T) {
	t.Parallel()
	_, ts, st := rawTestServerWithUI(t)
	hostID, _ := enrolHostForUI(t, nil, st, "del-rbac-host")

	for _, role := range []store.Role{store.RoleViewer, store.RoleOperator} {
		role := role
		t.Run(string(role), func(t *testing.T) {
			cookie := loginAsRole(t, st, role)
			form := url.Values{"confirm_hostname": {"del-rbac-host"}}
			req, _ := stdhttp.NewRequest("POST", ts.URL+"/hosts/"+hostID+"/delete",
				strings.NewReader(form.Encode()))
			req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
			req.AddCookie(cookie)
			res, err := stdhttp.DefaultClient.Do(req)
			if err != nil {
				t.Fatalf("do: %v", err)
			}
			defer res.Body.Close()
			if res.StatusCode != stdhttp.StatusForbidden {
				t.Fatalf("status: got %d, want 403", res.StatusCode)
			}
			if _, err := st.GetHost(context.Background(), hostID); err != nil {
				t.Fatalf("host should still exist; got %v", err)
			}
		})
	}
}

// TestHostDeleteHappyPathCascadesAndAudits: matching hostname removes
// the row, FK cascade wipes the seeded job, and an audit row lands.
func TestHostDeleteHappyPathCascadesAndAudits(t *testing.T) {
	t.Parallel()
	_, ts, st := rawTestServerWithUI(t)
	hostID, _ := enrolHostForUI(t, nil, st, "del-ok-host")

	// Seed one dependent row to prove the cascade fires through HTTP.
	if err := st.CreateJob(context.Background(), store.Job{
		ID: ulid.Make().String(), HostID: hostID, Kind: "backup",
		ActorKind: "system", CreatedAt: time.Now().UTC(),
	}); err != nil {
		t.Fatalf("seed job: %v", err)
	}

	cookie := loginAsAdmin(t, st)

	form := url.Values{"confirm_hostname": {"del-ok-host"}}
	req, _ := stdhttp.NewRequest("POST", ts.URL+"/hosts/"+hostID+"/delete",
		strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.AddCookie(cookie)
	// Don't follow the redirect so we can assert it.
	cli := &stdhttp.Client{
		CheckRedirect: func(*stdhttp.Request, []*stdhttp.Request) error {
			return stdhttp.ErrUseLastResponse
		},
	}
	res, err := cli.Do(req)
	if err != nil {
		t.Fatalf("do: %v", err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusSeeOther {
		t.Fatalf("status: got %d, want 303", res.StatusCode)
	}
	if loc := res.Header.Get("Location"); loc != "/" {
		t.Errorf("Location: got %q, want /", loc)
	}

	// Host gone.
	if _, err := st.GetHost(context.Background(), hostID); !errors.Is(err, store.ErrNotFound) {
		t.Errorf("GetHost after delete: want ErrNotFound, got %v", err)
	}
	// Cascade fired (job row gone).
	var n int
	if err := st.DB().QueryRow(`SELECT COUNT(*) FROM jobs WHERE host_id = ?`, hostID).Scan(&n); err != nil {
		t.Fatalf("count jobs: %v", err)
	}
	if n != 0 {
		t.Errorf("cascade left %d job rows", n)
	}
	// Audit row landed.
	var audN int
	if err := st.DB().QueryRow(
		`SELECT COUNT(*) FROM audit_log WHERE action = 'host.deleted' AND target_id = ?`,
		hostID).Scan(&audN); err != nil {
		t.Fatalf("count audit: %v", err)
	}
	if audN != 1 {
		t.Errorf("audit rows: got %d, want 1", audN)
	}
}