package webhook

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync"
	"testing"
	"time"

	"gitea.oblak.solutions/dimitar/gitFlow/pkg/status"
)

func samplePayload() Payload {
	return Payload{
		Timestamp: time.Date(2026, 1, 2, 3, 4, 5, 0, time.UTC),
		ParentDir: "/home/user/projects",
		Summary:   status.Summary{Total: 3, Clean: 1, Attention: 2, Errored: 0},
		Changed: []status.RepoInfo{
			{Name: "api", Branch: "main", Status: status.StatusBehind, BehindBy: 5},
			{Name: "web", Branch: "feat/login", Status: status.StatusModified, ModifiedFiles: []string{"a.go"}, AheadBy: 3},
		},
	}
}

func TestStatusSymbol(t *testing.T) {
	cases := []struct {
		s    status.RepoStatus
		want string
	}{
		{status.StatusClean, "✅"},
		{status.StatusModified, "✏️"},
		{status.StatusAhead, "⬆️"},
		{status.StatusBehind, "⬇️"},
		{status.StatusDiverged, "🔀"},
		{status.StatusDetached, "📌"},
		{status.StatusBare, "📦"},
		{status.StatusError, "❌"},
	}
	for _, tc := range cases {
		if got := statusSymbol(tc.s); got != tc.want {
			t.Errorf("statusSymbol(%v) = %q, want %q", tc.s, got, tc.want)
		}
	}
}

func TestNewSender(t *testing.T) {
	for _, typ := range []string{"slack", "discord", "generic"} {
		s, err := NewSender(Config{Name: "test", Type: typ, URL: "http://localhost"})
		if err != nil {
			t.Errorf("NewSender(%q): %v", typ, err)
		}
		if s.Name() != "test" {
			t.Errorf("NewSender(%q).Name() = %q, want test", typ, s.Name())
		}
	}
	if _, err := NewSender(Config{Name: "bad", Type: "nope"}); err == nil {
		t.Error("NewSender(nope) succeeded, want error")
	}
}

func TestSlackSender(t *testing.T) {
	var got slackMessage
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&got); err != nil {
			t.Fatal(err)
		}
		_, _ = w.Write([]byte("{}"))
	}))
	defer srv.Close()

	s := newSlack(Config{Name: "test", URL: srv.URL})
	if err := s.Send(t.Context(), samplePayload()); err != nil {
		t.Fatalf("Send: %v", err)
	}
	if len(got.Blocks) < 3 {
		t.Fatalf("got %d blocks, want >= 3", len(got.Blocks))
	}
	body := got.Blocks[1].Text.Text
	if !strings.Contains(body, "3 repos") || !strings.Contains(body, "1 clean") {
		t.Errorf("summary = %q", body)
	}
}

func TestDiscordSender(t *testing.T) {
	var got discordMessage
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&got); err != nil {
			t.Fatal(err)
		}
		_, _ = w.Write([]byte("{}"))
	}))
	defer srv.Close()

	s := newDiscord(Config{Name: "test", URL: srv.URL})
	if err := s.Send(t.Context(), samplePayload()); err != nil {
		t.Fatalf("Send: %v", err)
	}
	if len(got.Embeds) != 1 {
		t.Fatalf("got %d embeds, want 1", len(got.Embeds))
	}
	emb := got.Embeds[0]
	if emb.Title != "gitflow scan" {
		t.Errorf("title = %q", emb.Title)
	}
	if !strings.Contains(emb.Description, "3 repos") {
		t.Errorf("description = %q", emb.Description)
	}
	if emb.Color != 16776960 {
		t.Errorf("color = %d, want 16776960 (yellow/attention)", emb.Color)
	}
}

func TestDiscordErrorColor(t *testing.T) {
	p := samplePayload()
	p.Summary.Errored = 1
	var got discordMessage
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		json.NewDecoder(r.Body).Decode(&got)
		_, _ = w.Write([]byte("{}"))
	}))
	defer srv.Close()

	s := newDiscord(Config{Name: "test", URL: srv.URL})
	_ = s.Send(t.Context(), p)
	if got.Embeds[0].Color != 15158332 {
		t.Errorf("color = %d, want 15158332 (red/errors)", got.Embeds[0].Color)
	}
}

func TestGenericSender(t *testing.T) {
	var got Payload
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if err := json.NewDecoder(r.Body).Decode(&got); err != nil {
			t.Fatal(err)
		}
		_, _ = w.Write([]byte(`{}`))
	}))
	defer srv.Close()

	s := newGeneric(Config{Name: "test", URL: srv.URL})
	if err := s.Send(t.Context(), samplePayload()); err != nil {
		t.Fatalf("Send: %v", err)
	}
	if got.Summary.Total != 3 {
		t.Errorf("payload.Summary.Total = %d, want 3", got.Summary.Total)
	}
}

func TestDispatcherOnChangeOnly(t *testing.T) {
	var mu sync.Mutex
	var paths []string
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var p Payload
		json.NewDecoder(r.Body).Decode(&p)
		mu.Lock()
		for _, r := range p.Changed {
			paths = append(paths, r.Name)
		}
		mu.Unlock()
		_, _ = w.Write([]byte("{}"))
	}))
	defer srv.Close()

	d := NewDispatcher([]Config{{
		Name: "test", Type: "generic", URL: srv.URL, OnChangeOnly: true,
	}})
	payload := samplePayload()
	// No changes → skipped.
	errs := d.Dispatch(context.Background(), payload, 0)
	if len(errs) > 0 {
		t.Fatalf("Dispatch: %v", errs)
	}
	mu.Lock()
	noChangeCalls := len(paths)
	mu.Unlock()
	if noChangeCalls != 0 {
		t.Errorf("dispatch with changedCount=0 sent %d requests, want 0", noChangeCalls)
	}
}

func TestHTTPErrorSurfaced(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Error(w, "boom", http.StatusInternalServerError)
	}))
	defer srv.Close()

	s := newGeneric(Config{Name: "test", URL: srv.URL, Retry: RetryConfig{MaxAttempts: 1}})
	if err := s.Send(t.Context(), samplePayload()); err == nil {
		t.Error("Send(500) succeeded, want error")
	}
}

func TestRetryOnTransientErrors(t *testing.T) {
	var mu sync.Mutex
	var attempts int
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		mu.Lock()
		attempts++
		n := attempts
		mu.Unlock()
		if n < 3 {
			http.Error(w, "gateway timeout", http.StatusGatewayTimeout)
			return
		}
		_, _ = w.Write([]byte("{}"))
	}))
	defer srv.Close()

	d := NewDispatcher([]Config{{
		Name:  "test",
		Type:  "generic",
		URL:   srv.URL,
		Retry: RetryConfig{MaxAttempts: 3, Backoff: 1 * time.Millisecond},
	}})
	errs := d.Dispatch(context.Background(), samplePayload(), 1)
	if len(errs) > 0 {
		t.Fatalf("Dispatch: %v", errs)
	}
	mu.Lock()
	if attempts != 3 {
		t.Errorf("attempts = %d, want 3", attempts)
	}
	mu.Unlock()
}

func TestDispatcherMultipleSenders(t *testing.T) {
	var mu sync.Mutex
	var s1, s2 bool
	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		mu.Lock()
		s1 = true
		mu.Unlock()
		_, _ = w.Write([]byte("{}"))
	}))
	defer srv1.Close()
	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		mu.Lock()
		s2 = true
		mu.Unlock()
		_, _ = w.Write([]byte("{}"))
	}))
	defer srv2.Close()

	d := NewDispatcher([]Config{
		{Name: "w1", Type: "generic", URL: srv1.URL},
		{Name: "w2", Type: "generic", URL: srv2.URL},
	})
	errs := d.Dispatch(context.Background(), samplePayload(), 1)
	if len(errs) > 0 {
		t.Fatalf("Dispatch: %v", errs)
	}
	mu.Lock()
	if !s1 || !s2 {
		t.Errorf("s1=%v s2=%v, want both true", s1, s2)
	}
	mu.Unlock()
}