package offsite

import (
	"context"
	"database/sql"
	"encoding/json"
	"errors"
	"io"
	"log"
	"path/filepath"
	"strings"
	"testing"

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

func newTestProvisioner(t *testing.T) (*Provisioner, *hetznerapi.Fake, *store.Store) {
	t.Helper()
	st, err := store.New(filepath.Join(t.TempDir(), "off.db"), log.New(io.Discard, "", 0))
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { st.Close() })
	fake := hetznerapi.NewFake()
	return &Provisioner{API: fake, Store: st, PoolBoxID: 611421, Location: "fsn1", Logger: log.New(io.Discard, "", 0)}, fake, st
}

// Scenario A — enable shared → sub-account provisioned, descriptor built, one-time password stored (NOT in
// ConfigJSON), password absent from the merged config.
func TestProvision_Shared(t *testing.T) {
	p, fake, st := newTestProvisioner(t)
	d, err := p.ProvisionOffsite(context.Background(), "cust-a", Input{Enabled: true, Type: "shared", QuotaGB: 50})
	if err != nil {
		t.Fatalf("provision: %v", err)
	}
	if fake.CreatedSubaccounts != 1 {
		t.Fatalf("want 1 subaccount created, got %d", fake.CreatedSubaccounts)
	}
	if d.Type != "shared" || d.Port != 23 || d.RepoPath != "/home/felhom-repo" || d.QuotaGB != 50 || d.User == "" || d.Host == "" {
		t.Fatalf("descriptor wrong: %+v", d)
	}
	// one-time password stored + is NOT the descriptor / config
	pw, err := st.ConsumeOneTimeSecret("cust-a")
	if err != nil || pw == "" {
		t.Fatalf("one-time password not stored: %v", err)
	}
	merged, err := MergeDescriptor(`{"git":{"token":"x"}}`, d)
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(merged, pw) {
		t.Fatal("the transient password LEAKED into ConfigJSON")
	}
	if !strings.Contains(merged, `"offsite"`) || !strings.Contains(merged, `"git"`) {
		t.Fatalf("merge lost keys: %s", merged)
	}
	// descriptor struct has no password field at all
	db, _ := json.Marshal(d)
	if strings.Contains(strings.ToLower(string(db)), "password") {
		t.Fatalf("descriptor carries a password field: %s", db)
	}
}

// Scenario B — enable dedicated → box provisioned.
func TestProvision_Dedicated(t *testing.T) {
	p, fake, st := newTestProvisioner(t)
	d, err := p.ProvisionOffsite(context.Background(), "cust-b", Input{Enabled: true, Type: "dedicated", BoxType: "bx11"})
	if err != nil {
		t.Fatalf("provision: %v", err)
	}
	if fake.CreatedBoxes != 1 {
		t.Fatalf("want 1 box created, got %d", fake.CreatedBoxes)
	}
	if d.Type != "dedicated" || d.BoxType != "bx11" || d.User == "" || d.Host == "" || d.RepoPath != "/home/felhom-repo" {
		t.Fatalf("descriptor wrong: %+v", d)
	}
	if pw, err := st.ConsumeOneTimeSecret("cust-b"); err != nil || pw == "" {
		t.Fatalf("one-time password not stored: %v", err)
	}
}

// Scenario C — idempotent re-save does NOT create a second resource.
func TestProvision_Idempotent(t *testing.T) {
	p, fake, _ := newTestProvisioner(t)
	if _, err := p.ProvisionOffsite(context.Background(), "cust-c", Input{Enabled: true, Type: "shared", QuotaGB: 20}); err != nil {
		t.Fatal(err)
	}
	d2, err := p.ProvisionOffsite(context.Background(), "cust-c", Input{Enabled: true, Type: "shared", QuotaGB: 20})
	if err != nil {
		t.Fatal(err)
	}
	if fake.CreatedSubaccounts != 1 {
		t.Fatalf("re-provision created a SECOND resource (%d) — not idempotent", fake.CreatedSubaccounts)
	}
	if d2.User == "" || d2.Type != "shared" {
		t.Fatalf("idempotent descriptor wrong: %+v", d2)
	}
}

// Scenario D — a provisioning error surfaces; nothing is recorded (fail-closed). Companion: the caller must
// not mark offsite provisioned — modelled here by asserting no descriptor + no stored password on error.
func TestProvision_FailClosed(t *testing.T) {
	p, fake, st := newTestProvisioner(t)
	fake.FailCreate = errors.New("hetzner 500")
	d, err := p.ProvisionOffsite(context.Background(), "cust-d", Input{Enabled: true, Type: "shared", QuotaGB: 10})
	if err == nil {
		t.Fatal("a create failure must return an error (fail-closed)")
	}
	if d != nil {
		t.Fatalf("no descriptor may be returned on error, got %+v", d)
	}
	if _, cerr := st.ConsumeOneTimeSecret("cust-d"); cerr != sql.ErrNoRows {
		t.Fatal("no one-time password may be stored on a failed provision")
	}
	// action-failure path (create ok, action errors) is also fail-closed
	fake.FailCreate = nil
	fake.FailAction = true
	if _, err := p.ProvisionOffsite(context.Background(), "cust-d2", Input{Enabled: true, Type: "dedicated", BoxType: "bx11"}); err == nil {
		t.Fatal("a failed create-action must return an error")
	}
}

// Scenario E — the one-time password is consumable exactly once.
func TestOneTimeSecret_ConsumedOnce(t *testing.T) {
	_, _, st := newTestProvisioner(t)
	if err := st.SaveOneTimeSecret("cust-e", "secretpw"); err != nil {
		t.Fatal(err)
	}
	got, err := st.ConsumeOneTimeSecret("cust-e")
	if err != nil || got != "secretpw" {
		t.Fatalf("first consume: got %q err %v", got, err)
	}
	if _, err := st.ConsumeOneTimeSecret("cust-e"); err != sql.ErrNoRows {
		t.Fatalf("second consume must be ErrNoRows, got %v", err)
	}
	if _, err := st.ConsumeOneTimeSecret("never-provisioned"); err != sql.ErrNoRows {
		t.Fatalf("absent consume must be ErrNoRows, got %v", err)
	}
}

// Disable → {Enabled:false}, no deprovision (no API delete).
func TestProvision_DisableNoDeprovision(t *testing.T) {
	p, fake, _ := newTestProvisioner(t)
	d, err := p.ProvisionOffsite(context.Background(), "cust-f", Input{Enabled: false})
	if err != nil || d == nil || d.Enabled {
		t.Fatalf("disable must return {enabled:false}, got %+v err %v", d, err)
	}
	if fake.DeletedSubaccounts != 0 || fake.DeletedBoxes != 0 {
		t.Fatal("disable must NOT deprovision (data-loss guard)")
	}
}