package httpapi

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"knowledge-governance/internal/governance"
)

// F01：同一个目标快照的**新意图**必须真的执行，不能被"这个快照曾经成功过"吞掉。
//
// 现场形状：同步 B 成功 → 恢复 A → 再次同步 B。第三次请求是一次合法意图，
// 旧实现返回第一次的成功作业（202, 不再并入队），用户要的状态没实现。
//
// 判据：换 operation_key ⇒ 新 operation（ID 不同、作业幂等键不同）；
// 同一个 operation_key ⇒ 同一 operation（重放）。
func TestLibrarySyncNewIntentReExecutesInsteadOfReusingHistory(t *testing.T) {
	target := "snap-1"
	digest, err := librarySyncParamsDigest("internal", target)
	if err != nil {
		t.Fatal(err)
	}
	now := time.Now().UTC()
	newStore := func() *fakeLibraryStore {
		store := &fakeLibraryStore{
			current: &governance.LibraryVersion{ID: "ver-prod", Scope: "internal",
				Kind: governance.LibraryVersionProductionEffective, SnapshotID: "prod-snap",
				VersionLabel: "prod-2026.10", CreatedAt: now.Add(-72 * time.Hour)},
		}
		store.enqueueEchoRequestedID = true
		store.grant = &governance.LibraryReleaseAuthorization{ID: "auth-1", Scope: "internal", SnapshotID: target,
			ParamsDigest: digest, AuthorizedBy: "admin", ExpiresAt: now.Add(30 * time.Minute), CreatedAt: now}
		return store
	}
	config := func(store *fakeLibraryStore) Config {
		return Config{Store: store, ProductionReleaseRequestsEnabled: true, ProductionBackupRestoreVerified: true,
			LibraryProductionDatabaseURL: "postgres://prod.invalid/db", LibraryProductionInternalKB: "kb-int",
			LibraryCapacityBudgetBytes: 1 << 40}
	}
	post := func(store *fakeLibraryStore, body string) *httptest.ResponseRecorder {
		recorder := httptest.NewRecorder()
		librarySyncEnqueue(recorder, httptest.NewRequest(http.MethodPost, "/api/v1/library/syncs",
			strings.NewReader(body)), config(store))
		return recorder
	}
	withKey := `{"scope":"internal","target_snapshot_id":"` + target + `","operation_key":"%s"}`

	// 第一次意图：建作业。
	first := newStore()
	if recorder := post(first, strings.Replace(withKey, "%s", "intent-1", 1)); recorder.Code != http.StatusAccepted {
		t.Fatalf("首次发布会话 status=%d body=%s", recorder.Code, recorder.Body.String())
	}
	firstOperation := first.lastOperation.ID
	if firstOperation == "" || first.lastJob.OperationID != firstOperation {
		t.Fatalf("作业必须挂在意图上：job.operation=%q intent=%q", first.lastJob.OperationID, firstOperation)
	}

	// 同一次意图重放（双击/超时重发）：同一个 operation，不产生第二条意图。
	replay := newStore()
	if recorder := post(replay, strings.Replace(withKey, "%s", "intent-1", 1)); recorder.Code != http.StatusAccepted {
		t.Fatalf("重放 status=%d body=%s", recorder.Code, recorder.Body.String())
	}
	if replay.lastOperation.ID != firstOperation {
		t.Fatalf("同一意图键得到了不同 operation：%q vs %q", replay.lastOperation.ID, firstOperation)
	}

	// 新意图（同一快照、不同键）：必须是新 operation ⇒ 新作业幂等键 ⇒ 真的执行。
	second := newStore()
	if recorder := post(second, strings.Replace(withKey, "%s", "intent-2", 1)); recorder.Code != http.StatusAccepted {
		t.Fatalf("新意图 status=%d body=%s", recorder.Code, recorder.Body.String())
	}
	if second.lastOperation.ID == firstOperation {
		t.Fatal("同一快照的新意图必须得到新 operation：否则历史成功会吞掉本次请求（F01）")
	}
	if second.lastJob.IdempotencyKey == first.lastJob.IdempotencyKey {
		t.Fatal("新意图的作业幂等键与历史作业相同：CreateLibraryJob 会返回旧作业，什么也不执行")
	}
	if second.createN != 1 {
		t.Fatalf("新意图必须建作业并执行，created=%d", second.createN)
	}
}

// 同一个意图键配上不同快照 = 冲突，不能悄悄共享谱系。
func TestLibrarySyncIntentKeyReusedWithAnotherSnapshotConflicts(t *testing.T) {
	target := "snap-1"
	digest, _ := librarySyncParamsDigest("internal", target)
	now := time.Now().UTC()
	store := &fakeLibraryStore{current: &governance.LibraryVersion{ID: "ver-prod", Scope: "internal",
		Kind: governance.LibraryVersionProductionEffective, SnapshotID: "prod-snap", CreatedAt: now.Add(-time.Hour)}}
	store.grant = &governance.LibraryReleaseAuthorization{ID: "auth-1", Scope: "internal", SnapshotID: target,
		ParamsDigest: digest, AuthorizedBy: "admin", ExpiresAt: now.Add(time.Hour), CreatedAt: now}
	// 预先登记一条"同键但不同快照"的意图。
	if _, _, err := store.EnsureLibraryOperation(nil, governance.LibraryOperation{
		ID: "libop-x", Scope: "internal", Kind: governance.LibraryJobSync, TargetSnapshotID: "other-snap",
		RequestDigest: "different", OperationKey: target + "#intent-1", CreatedAt: now}); err != nil {
		t.Fatal(err)
	}
	config := Config{Store: store, ProductionReleaseRequestsEnabled: true, ProductionBackupRestoreVerified: true,
		LibraryProductionDatabaseURL: "postgres://prod.invalid/db", LibraryProductionInternalKB: "kb-int",
		LibraryCapacityBudgetBytes: 1 << 40}
	body := `{"scope":"internal","target_snapshot_id":"` + target + `","operation_key":"intent-1"}`
	recorder := httptest.NewRecorder()
	librarySyncEnqueue(recorder, httptest.NewRequest(http.MethodPost, "/api/v1/library/syncs", strings.NewReader(body)), config)
	if recorder.Code != http.StatusConflict {
		t.Fatalf("同键不同内容必须 409，status=%d body=%s", recorder.Code, recorder.Body.String())
	}
}

// F14：通用 queue 入口不许创建整库保留类型——那里的角色检查替代不了发布准入。
func TestCreateJobRejectsReservedLibraryTypes(t *testing.T) {
	store := &fakeJobStore{}
	config := Config{Store: store}
	body := `{"type":"library.baseline","payload":{"scope":"internal"},"idempotency_key":"k-1"}`
	recorder := httptest.NewRecorder()
	createJob(recorder, httptest.NewRequest(http.MethodPost, "/api/v1/jobs", strings.NewReader(body)), config)
	if recorder.Code != http.StatusBadRequest {
		t.Fatalf("保留类型必须被通用入口拒绝：status=%d body=%s", recorder.Code, recorder.Body.String())
	}
	if !strings.Contains(recorder.Body.String(), "发布管理专用入口") {
		t.Fatalf("拒绝原因必须指向专用入口：%s", recorder.Body.String())
	}
}