package notice

import (
	"context"
	"encoding/json"
	"errors"
	"reflect"
	"strings"
	"sync"
	"testing"
	"time"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

type stubNetworkClient struct {
	mu       sync.Mutex       `json:"-" dc:"测试请求记录锁"`
	requests []networkRequest `json:"-" dc:"测试请求记录"`
	response networkResponse  `json:"-" dc:"测试响应"`
	err      error            `json:"-" dc:"测试错误"`
}

func (c *stubNetworkClient) Post(request networkRequest) (networkResponse, error) {
	c.mu.Lock()
	defer c.mu.Unlock()
	c.requests = append(c.requests, request)
	return c.response, c.err
}

type stubSender struct {
	mu       sync.Mutex `json:"-" dc:"测试消息记录锁"`
	messages []Message  `json:"-" dc:"测试消息记录"`
	err      error      `json:"-" dc:"测试发送错误"`
}

func (s *stubSender) Send(_ context.Context, message Message) error {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.messages = append(s.messages, message)
	return s.err
}

func (s *stubSender) SendAsync(ctx context.Context, message Message) <-chan error {
	result := make(chan error, 1)
	result <- s.Send(ctx, message)
	close(result)
	return result
}

func TestRenderersRenderSupportedMessages(t *testing.T) {
	messages := []Message{
		Text("hello"),
		ColorText(TextSegment{Text: "failed", Color: ColorDanger, Bold: true}),
		Markdown("alert", "**failed**"),
		Card(CardContent{
			Title: "release", Theme: CardThemeGreen, Markdown: "done",
			Fields:  []CardField{{Name: "service", Value: "order"}},
			Actions: []CardAction{{Text: "details", URL: "https://example.com/releases/1"}},
		}),
	}
	tests := []struct {
		Name     string   `json:"name" dc:"测试名称"`
		Channel  Channel  `json:"channel" dc:"测试渠道"`
		Renderer renderer `json:"-" dc:"待测试 Renderer"`
	}{
		{Name: "feishu", Channel: ChannelFeishu, Renderer: feishuRenderer{}},
		{Name: "dingtalk", Channel: ChannelDingTalk, Renderer: dingTalkRenderer{}},
		{Name: "wecom", Channel: ChannelWeCom, Renderer: weComRenderer{}},
		{Name: "webhook", Channel: ChannelWebhook, Renderer: webhookRenderer{}},
	}
	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			for _, message := range messages {
				if err := validateMessage(message); err != nil {
					t.Fatalf("valid message rejected: %v", err)
				}
				request, err := test.Renderer.Render(Config{Webhook: "https://example.com/hook"}, message)
				if err != nil {
					t.Fatalf("render %s: %v", message.Type, err)
				}
				if !json.Valid(request.Body) {
					t.Fatalf("rendered body is not JSON: %s", request.Body)
				}
			}
		})
	}
}

func TestFeishuCardThemeAndDingTalkSignature(t *testing.T) {
	request, err := (feishuRenderer{}).Render(Config{Webhook: "https://example.com/hook"}, Card(CardContent{
		Title: "release", Theme: CardThemeViolet, Markdown: "done",
		Actions: []CardAction{{Text: "details", URL: "https://example.com/releases/1"}},
	}))
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(request.Body), `"template":"violet"`) {
		t.Fatalf("feishu theme missing: %s", request.Body)
	}
	if strings.Contains(string(request.Body), `"tag":"action"`) || !strings.Contains(string(request.Body), `"tag":"button"`) {
		t.Fatalf("feishu Card JSON 2.0 button structure is invalid: %s", request.Body)
	}

	dingRequest, err := (dingTalkRenderer{}).Render(Config{
		Webhook:  "https://example.com/hook?access_token=x",
		Security: &SecurityConfig{SignEnabled: true, SignSecret: "test-secret"},
	}, Text("hello"))
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(dingRequest.URL, "timestamp=") || !strings.Contains(dingRequest.URL, "sign=") {
		t.Fatalf("dingtalk signature query missing: %s", dingRequest.URL)
	}
}

func TestIndependentSignatureSecurity(t *testing.T) {
	feishuConfig := Config{
		Webhook:  "https://example.com/feishu",
		Security: &SecurityConfig{SignEnabled: true, SignSecret: "feishu-test-secret"},
	}
	request, err := (feishuRenderer{}).Render(feishuConfig, Text("hello"))
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(request.Body), `"timestamp"`) || !strings.Contains(string(request.Body), `"sign"`) {
		t.Fatalf("feishu signature fields missing: %s", request.Body)
	}

	unsigned, err := (feishuRenderer{}).Render(Config{
		Webhook:  "https://example.com/feishu",
		Security: &SecurityConfig{SignEnabled: false, SignSecret: "ignored-secret"},
	}, Text("hello"))
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(string(unsigned.Body), `"sign"`) || strings.Contains(string(unsigned.Body), `"timestamp"`) {
		t.Fatalf("disabled security unexpectedly signed request: %s", unsigned.Body)
	}

	if _, err = New(ChannelFeishu, Config{
		Webhook:  "https://example.com/feishu",
		Security: &SecurityConfig{SignEnabled: true},
	}); !errors.Is(err, ErrInvalidConfig) {
		t.Fatalf("expected empty signature secret validation error, got %v", err)
	}
	if _, err = New(ChannelWeCom, Config{
		Webhook:  "https://example.com/wecom",
		Security: &SecurityConfig{SignEnabled: true, SignSecret: "unsupported"},
	}); !errors.Is(err, ErrInvalidConfig) {
		t.Fatalf("expected unsupported signature validation error, got %v", err)
	}
}

func TestSenderSyncAsyncAndPlatformError(t *testing.T) {
	client := &stubNetworkClient{response: networkResponse{StatusCode: 200, Body: []byte(`{"errcode":0,"errmsg":"ok"}`)}}
	sender, err := newSender(ChannelWeCom, Config{Webhook: "https://example.com/hook"}, client)
	if err != nil {
		t.Fatal(err)
	}
	if err = sender.Send(context.Background(), Text("hello")); err != nil {
		t.Fatalf("sync send: %v", err)
	}
	if err = <-sender.SendAsync(context.Background(), Markdown("title", "body")); err != nil {
		t.Fatalf("async send: %v", err)
	}
	if len(client.requests) != 2 {
		t.Fatalf("got %d requests, want 2", len(client.requests))
	}

	client.response.Body = []byte(`{"errcode":93000,"errmsg":"invalid webhook"}`)
	err = sender.Send(context.Background(), Text("hello"))
	var platformErr *PlatformError
	if !errors.As(err, &platformErr) || platformErr.Code != "93000" {
		t.Fatalf("expected PlatformError, got %v", err)
	}
}

func TestFactoryCachesInstanceConcurrently(t *testing.T) {
	factory := NewFactory(map[Channel]Config{ChannelWebhook: {Webhook: "https://example.com/hook"}})
	const workers = 32
	instances := make(chan Sender, workers)
	var group sync.WaitGroup
	for range workers {
		group.Add(1)
		go func() {
			defer group.Done()
			instance, err := factory.Get(ChannelWebhook)
			if err != nil {
				t.Errorf("factory get: %v", err)
				return
			}
			instances <- instance
		}()
	}
	group.Wait()
	close(instances)
	var first Sender
	for instance := range instances {
		if first == nil {
			first = instance
			continue
		}
		if first != instance {
			t.Fatal("factory returned different instances for one channel")
		}
	}
}

func TestZapCoreDefaultExactLevelsAndSync(t *testing.T) {
	sender := &stubSender{}
	_, levels, err := normalizeZapConfig(ZapConfig{Channels: []Channel{ChannelWebhook}})
	if err != nil {
		t.Fatal(err)
	}
	noticeCore := &zapNoticeCore{
		senders: []Sender{sender}, levels: levels, pending: &sync.WaitGroup{},
	}
	base := zap.NewNop()
	logger := base.WithOptions(zap.WrapCore(func(original zapcore.Core) zapcore.Core {
		return zapcore.NewTee(original, noticeCore)
	})).With(zap.String("service", "order"))
	logger.Info("started")
	logger.Warn("slow", zap.Int("delay_ms", 2500))
	logger.Error("failed")
	if err := logger.Sync(); err != nil {
		t.Fatal(err)
	}
	if len(sender.messages) != 2 {
		t.Fatalf("got %d messages, want warn and error only", len(sender.messages))
	}
	themes := map[CardTheme]int{}
	for _, message := range sender.messages {
		if message.Card == nil {
			t.Fatalf("unexpected non-card Zap message: %#v", message)
		}
		themes[message.Card.Theme]++
	}
	if themes[CardThemeOrange] != 1 || themes[CardThemeRed] != 1 {
		t.Fatalf("unexpected Zap card themes: %#v", themes)
	}
}

func TestAllStructFieldsHaveJSONAndDCTags(t *testing.T) {
	types := []reflect.Type{
		reflect.TypeOf(Message{}), reflect.TypeOf(TextSegment{}), reflect.TypeOf(CardContent{}),
		reflect.TypeOf(CardField{}), reflect.TypeOf(CardAction{}), reflect.TypeOf(Config{}),
		reflect.TypeOf(SecurityConfig{}),
		reflect.TypeOf(ZapConfig{}), reflect.TypeOf(Capabilities{}), reflect.TypeOf(HTTPError{}),
		reflect.TypeOf(PlatformError{}), reflect.TypeOf(Factory{}), reflect.TypeOf(channelSender{}),
		reflect.TypeOf(networkRequest{}), reflect.TypeOf(networkResponse{}), reflect.TypeOf(renderedRequest{}),
		reflect.TypeOf(zapNoticeCore{}),
	}
	for _, typ := range types {
		for index := 0; index < typ.NumField(); index++ {
			field := typ.Field(index)
			if _, exists := field.Tag.Lookup("json"); !exists {
				t.Errorf("%s.%s has no json tag", typ.Name(), field.Name)
			}
			if value, exists := field.Tag.Lookup("dc"); !exists || strings.TrimSpace(value) == "" {
				t.Errorf("%s.%s has no dc tag", typ.Name(), field.Name)
			}
		}
	}
}

func TestContextAlreadyCancelled(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	client := &stubNetworkClient{err: context.Canceled}
	sender, err := newSender(ChannelWebhook, Config{Webhook: "https://example.com/hook", Timeout: time.Second}, client)
	if err != nil {
		t.Fatal(err)
	}
	if err = sender.Send(ctx, Text("hello")); !errors.Is(err, context.Canceled) {
		t.Fatalf("expected context cancellation, got %v", err)
	}
}