package adapter

// 本文件证明出站 id 出口（outbound.go）的三条硬性质：**向后兼容**（老适配器一行不改、
// 探测失败即如实报「不知道」）、**三态可分辨**、**取不到就是空 / 绝不编造**。

import (
	"context"
	"errors"
	"testing"
)

// receiptAdapter 是同时实现了 PlatformAdapter 与 OutboundReceiptAdapter 的桩：
// 它记录两条路径各被调用了几次，用来证明「实现了 seam 的适配器**只**走凭据路径」
// （绝不出现一条消息发两遍）。
type receiptAdapter struct {
	mockAdapter
	receiptCalls int
	receipts     []SendReceipt
}

func (m *receiptAdapter) SendMessageWithReceipt(_ context.Context, resp UnifiedResponse) (SendOutcome, error) {
	m.receiptCalls++
	m.sent = resp.Messages
	return SendOutcome{Receipts: m.receipts}, nil
}

var (
	_ PlatformAdapter        = (*receiptAdapter)(nil)
	_ OutboundReceiptAdapter = (*receiptAdapter)(nil)
)

// failAdapter 的投递恒失败，用来验证错误原样穿过 SendWithReceipt。
type failAdapter struct {
	mockAdapter
	err error
}

func (f *failAdapter) SendMessage(context.Context, UnifiedResponse) error { return f.err }

func TestNewSendReceiptNeverReportsEmptyID(t *testing.T) {
	t.Parallel()

	absent := NewSendReceipt("")
	if absent.MessageID != "" || absent.IDStatus != SendIDAbsent || absent.Reported() {
		t.Errorf("NewSendReceipt(\"\") = %+v, want absent with empty id", absent)
	}

	reported := NewSendReceipt("1700000012345")
	if reported.MessageID != "1700000012345" || !reported.Reported() {
		t.Errorf("NewSendReceipt(id) = %+v, want reported id", reported)
	}
}

// TestSendReceiptZeroValueIsUnknown 钉住 fail-closed 的零值口径：一个只写了
// `SendReceipt{}` 的实现表示「不知道」，绝不能被读成「平台给了 id」。
func TestSendReceiptZeroValueIsUnknown(t *testing.T) {
	t.Parallel()

	var zero SendReceipt
	if zero.IDStatus != SendIDUnreported {
		t.Errorf("zero IDStatus = %q, want %q", zero.IDStatus, SendIDUnreported)
	}
	if zero.MessageID != "" || zero.Reported() {
		t.Errorf("zero receipt = %+v, want empty and not reported", zero)
	}
}

// TestPlainAdapterIsNotAReceiptAdapter 是**向后兼容**的运行时证据：一个只实现
// PlatformAdapter 的适配器（等价于 kook / telegram / weixin-ilink / webhook）**不是**
// OutboundReceiptAdapter —— 契约没被破坏，它们一行都不用改。
func TestPlainAdapterIsNotAReceiptAdapter(t *testing.T) {
	t.Parallel()

	var a PlatformAdapter = &mockAdapter{name: "telegram"}
	if _, ok := a.(OutboundReceiptAdapter); ok {
		t.Fatal("plain adapter must not satisfy OutboundReceiptAdapter")
	}
}

// TestSendWithReceiptFallsBackToSendMessage 覆盖未接线渠道：投递照旧走 SendMessage，
// 凭据如实报「未取到」——**逐条**与 Messages 等长，且 id 全空（绝不编造）。
func TestSendWithReceiptFallsBackToSendMessage(t *testing.T) {
	t.Parallel()

	ad := &mockAdapter{name: "telegram"}
	resp := UnifiedResponse{Messages: []UnifiedMessage{
		{ChannelType: ChannelDirect, ContentType: ContentText, Content: "一"},
		{ChannelType: ChannelDirect, ContentType: ContentText, Content: "二"},
	}}

	out, err := SendWithReceipt(context.Background(), ad, resp)
	if err != nil {
		t.Fatalf("SendWithReceipt() error = %v", err)
	}
	if len(ad.sent) != 2 {
		t.Fatalf("fallback did not deliver through SendMessage: sent = %+v", ad.sent)
	}
	if len(out.Receipts) != 2 {
		t.Fatalf("Receipts len = %d, want 2 (one per message)", len(out.Receipts))
	}
	for i, r := range out.Receipts {
		if r.MessageID != "" || r.IDStatus != SendIDUnreported || r.Reported() {
			t.Errorf("receipt[%d] = %+v, want empty id with unreported status", i, r)
		}
	}
}

// TestSendWithReceiptUsesSeamWhenImplemented 证明实现了 seam 的适配器只走凭据路径
// （不会两条路径各发一遍）。
func TestSendWithReceiptUsesSeamWhenImplemented(t *testing.T) {
	t.Parallel()

	ad := &receiptAdapter{receipts: []SendReceipt{NewSendReceipt("9001")}}
	ad.name = "qq-obv11"

	out, err := SendWithReceipt(context.Background(), ad, UnifiedResponse{Messages: []UnifiedMessage{
		{ChannelType: ChannelGroup, GroupID: "123", ContentType: ContentText, Content: "pong"},
	}})
	if err != nil {
		t.Fatalf("SendWithReceipt() error = %v", err)
	}
	if ad.receiptCalls != 1 {
		t.Errorf("receipt path calls = %d, want 1", ad.receiptCalls)
	}
	if len(out.Receipts) != 1 || out.Receipts[0].MessageID != "9001" {
		t.Errorf("Receipts = %+v, want one reported 9001", out.Receipts)
	}
}

func TestSendWithReceiptPropagatesError(t *testing.T) {
	t.Parallel()

	want := errors.New("boom")
	ad := &failAdapter{err: want}

	_, err := SendWithReceipt(context.Background(), ad, UnifiedResponse{Messages: []UnifiedMessage{
		{ChannelType: ChannelDirect, ContentType: ContentText, Content: "x"},
	}})
	if !errors.Is(err, want) {
		t.Fatalf("SendWithReceipt() error = %v, want %v", err, want)
	}
}

func TestSendWithReceiptNilAdapter(t *testing.T) {
	t.Parallel()

	if _, err := SendWithReceipt(context.Background(), nil, UnifiedResponse{}); !errors.Is(err, ErrNotConnected) {
		t.Fatalf("SendWithReceipt(nil) error = %v, want ErrNotConnected", err)
	}
}