package agent

import (
	"context"
	"errors"
	"net/http"
	"os"
	"path/filepath"
	"testing"
	"time"

	agentpb "git.ipao.vip/rogee/go-sip/gen/agent"
	"github.com/google/uuid"
	"google.golang.org/protobuf/proto"
)

type mockFailureRPC struct {
	requests     []*agentpb.ReportExecutionEventRequest
	unavailable  bool
	wrongReceipt bool
}

func (m *mockFailureRPC) ReportExecutionEvent(_ context.Context, request *agentpb.ReportExecutionEventRequest) (*agentpb.ReportExecutionEventResponse, error) {
	m.requests = append(m.requests, proto.Clone(request).(*agentpb.ReportExecutionEventRequest))
	if m.unavailable {
		return nil, errors.New("Dispatcher unavailable before receipt")
	}
	factID := request.Fact.FactId
	if m.wrongReceipt {
		factID = uuid.NewString()
	}
	return &agentpb.ReportExecutionEventResponse{Receipt: &agentpb.OperationReceipt{
		Result: agentpb.ResultCode_RESULT_CODE_ACCEPTED, FactId: factID, ContentSha256: request.Fact.ContentSha256,
	}}, nil
}

func TestMockUploadFailureReportReusesDurableFactAcrossActiveBoots(t *testing.T) {
	root := t.TempDir()
	observed := time.Date(2026, 9, 21, 2, 0, 0, 0, time.UTC)
	spool, err := NewSpool(root, func() time.Time { return observed })
	if err != nil {
		t.Fatal(err)
	}
	binding := &agentpb.ExecutionBinding{TenantId: "tenant-a", TenantKey: "tenant-a", ExecutionId: "execution-a"}
	if err := spool.ClaimUpload(UploadAttempt{
		UploadID: "upload-a", Identity: "identity-a", State: "attempted", RequestID: uuid.NewString(),
		Binding: binding, Asset: &agentpb.AssetDescriptor{AssetId: "recording-a"},
	}); err != nil {
		t.Fatal(err)
	}
	active := &agentpb.RequestMeta{
		ProtocolVersion: "agent.v1", AgentId: "agent-a", CellId: "cell-a", BootId: "boot-old",
		DispatcherEpoch: "epoch-a", SessionGeneration: 1,
	}
	remote := &mockFailureRPC{unavailable: true}
	known, err := spool.ReportMockUploadFailure(context.Background(), remote, active, "upload-a", &UploadHTTPError{StatusCode: http.StatusForbidden})
	if !known || err == nil || len(remote.requests) != 1 {
		t.Fatalf("explicit 403 failure was not durably sent: known=%t requests=%d err=%v", known, len(remote.requests), err)
	}
	record, err := spool.LoadUploadAttempt("upload-a")
	if err != nil || record.FailureFact == nil || record.FailureDelivered {
		t.Fatalf("fact lost before receipt: record=%+v err=%v", record, err)
	}
	factID, digest, sourceBoot := record.FailureFact.FactId, record.FailureFact.ContentSha256, record.FailureFact.SourceBootId
	if sourceBoot != active.BootId || record.FailureFact.ObservedAtUnixMs != observed.UnixMilli() {
		t.Fatalf("fact lost source boot or observation clock: boot=%q observed=%d", sourceBoot, record.FailureFact.ObservedAtUnixMs)
	}
	restarted, err := NewSpool(root, nil)
	if err != nil {
		t.Fatal(err)
	}
	activeNew := proto.Clone(active).(*agentpb.RequestMeta)
	activeNew.BootId = "boot-new"
	activeNew.SessionGeneration = 2
	remote.unavailable, remote.wrongReceipt = false, true
	if err := restarted.RecoverMockUploadFailures(context.Background(), remote, activeNew); err == nil {
		t.Fatal("unrelated accepted receipt closed a durable failure fact")
	}
	record, err = restarted.LoadUploadAttempt("upload-a")
	if err != nil || record.FailureDelivered {
		t.Fatalf("false receipt advanced failure state: record=%+v err=%v", record, err)
	}
	remote.wrongReceipt = false
	if err := restarted.RecoverMockUploadFailures(context.Background(), remote, activeNew); err != nil {
		t.Fatalf("failure fact not recovered after boot change: %v", err)
	}
	record, err = restarted.LoadUploadAttempt("upload-a")
	if err != nil || !record.FailureDelivered || record.State != "attempted" {
		t.Fatalf("accepted receipt did not close only the fact: record=%+v err=%v", record, err)
	}
	if len(remote.requests) != 3 {
		t.Fatalf("expected original, false receipt and recovery; got %d reports", len(remote.requests))
	}
	for _, request := range remote.requests {
		if request.Fact.FactId != factID || request.Fact.ContentSha256 != digest || request.Fact.SourceBootId != sourceBoot {
			t.Fatalf("recovery generated a new failure identity: %+v", request.Fact)
		}
	}
	if remote.requests[2].Meta.BootId != activeNew.BootId || remote.requests[2].Meta.SessionGeneration != activeNew.SessionGeneration {
		t.Fatalf("recovery did not use the current active session: %+v", remote.requests[2].Meta)
	}
	if err := restarted.RecoverMockUploadFailures(context.Background(), remote, activeNew); err != nil || len(remote.requests) != 3 {
		t.Fatalf("acknowledged failure re-reported: requests=%d err=%v", len(remote.requests), err)
	}
}

func TestMockUploadFailureClassificationKeepsUncertainOutcomesUnknown(t *testing.T) {
	for _, tc := range []struct {
		name string
		err  error
		code string
	}{
		{"expired grant", ErrUploadGrantExpired, "upload_authorization_expired"},
		{"invalid grant", ErrUploadGrantInvalid, "upload_authorization_failed"},
		{"checksum mismatch", ErrUploadChecksumMismatch, "checksum_mismatch"},
		{"explicit 400", &UploadHTTPError{StatusCode: http.StatusBadRequest}, "upload_failed"},
		{"explicit 403", &UploadHTTPError{StatusCode: http.StatusForbidden}, "upload_authorization_failed"},
		{"missing recording", os.ErrNotExist, "upload_failed"},
		{"request timeout", &UploadHTTPError{StatusCode: http.StatusRequestTimeout}, ""},
		{"throttled", &UploadHTTPError{StatusCode: http.StatusTooManyRequests}, ""},
		{"server uncertain", &UploadHTTPError{StatusCode: http.StatusInternalServerError}, ""},
		{"transport uncertain", errors.New("connection reset"), ""},
	} {
		t.Run(tc.name, func(t *testing.T) {
			if got := MockUploadFailureCode(tc.err); got != tc.code {
				t.Fatalf("classification %q, want %q", got, tc.code)
			}
		})
	}
	spool, err := NewSpool(t.TempDir(), nil)
	if err != nil {
		t.Fatal(err)
	}
	if err := spool.ClaimUpload(UploadAttempt{
		UploadID: "unknown-a", Identity: "identity-a", State: "attempted", RequestID: uuid.NewString(),
		Binding: &agentpb.ExecutionBinding{TenantId: "tenant-a", TenantKey: "tenant-a", ExecutionId: "execution-a"},
		Asset:   &agentpb.AssetDescriptor{AssetId: "recording-a"},
	}); err != nil {
		t.Fatal(err)
	}
	active := &agentpb.RequestMeta{ProtocolVersion: "agent.v1", AgentId: "agent-a", CellId: "cell-a", BootId: "boot-a", DispatcherEpoch: "epoch-a", SessionGeneration: 1}
	remote := &mockFailureRPC{}
	known, err := spool.ReportMockUploadFailure(context.Background(), remote, active, "unknown-a", &UploadHTTPError{StatusCode: 500})
	if err != nil || known || len(remote.requests) != 0 {
		t.Fatalf("unknown PUT was reported as failed: known=%t reports=%d err=%v", known, len(remote.requests), err)
	}
	pending, err := spool.PendingUploadFailures()
	if err != nil || len(pending) != 0 {
		t.Fatalf("unknown PUT produced a terminal fact: pending=%d err=%v", len(pending), err)
	}
	if _, err := os.Stat(filepath.Join(spool.root, ".uploads", "unknown-a", "state.json")); err != nil {
		t.Fatal(err)
	}
}