package gitea

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

func TestNewClient(t *testing.T) {
	c := NewClient("https://gitea.example.com")
	if c.baseURL != "https://gitea.example.com" {
		t.Errorf("baseURL = %q, want %q", c.baseURL, "https://gitea.example.com")
	}
	if c.maxConcurrent != 5 {
		t.Errorf("maxConcurrent = %d, want 5", c.maxConcurrent)
	}
	if c.cacheTTL != 30*time.Second {
		t.Errorf("cacheTTL = %v, want 30s", c.cacheTTL)
	}
}

func TestNewClient_TrailingSlash(t *testing.T) {
	c := NewClient("https://gitea.example.com/")
	if c.baseURL != "https://gitea.example.com" {
		t.Errorf("baseURL = %q, want trailing slash removed", c.baseURL)
	}
}

func TestCache(t *testing.T) {
	c := NewClient("https://gitea.example.com")

	// Cache miss.
	_, ok := c.getFromCache("key1")
	if ok {
		t.Error("expected cache miss")
	}

	// Cache set and hit.
	c.setCache("key1", "value1")
	val, ok := c.getFromCache("key1")
	if !ok {
		t.Fatal("expected cache hit")
	}
	if val.(string) != "value1" {
		t.Errorf("got %q, want %q", val, "value1")
	}

	// Invalidate.
	c.invalidateCache("key")
	_, ok = c.getFromCache("key1")
	if ok {
		t.Error("expected cache miss after invalidation")
	}
}

func TestCacheExpiry(t *testing.T) {
	c := NewClient("https://gitea.example.com")
	c.cacheTTL = 1 * time.Millisecond

	c.setCache("key1", "value1")
	time.Sleep(5 * time.Millisecond)

	_, ok := c.getFromCache("key1")
	if ok {
		t.Error("expected cache miss after TTL expiry")
	}
}

func TestInvalidateAll(t *testing.T) {
	c := NewClient("https://gitea.example.com")
	c.setCache("key1", "value1")
	c.setCache("key2", "value2")

	c.InvalidateAll()

	_, ok1 := c.getFromCache("key1")
	_, ok2 := c.getFromCache("key2")
	if ok1 || ok2 {
		t.Error("expected all cache entries to be invalidated")
	}
}

func TestPriorityScore(t *testing.T) {
	tests := []struct {
		labels []string
		want   int
	}{
		{[]string{"P1", "bug"}, 1},
		{[]string{"P2"}, 2},
		{[]string{"P3", "enhancement"}, 3},
		{[]string{"bug", "enhancement"}, 4},
		{nil, 4},
	}

	for _, tt := range tests {
		got := priorityScore(tt.labels)
		if got != tt.want {
			t.Errorf("priorityScore(%v) = %d, want %d", tt.labels, got, tt.want)
		}
	}
}

func TestListOrgs(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/v1/user/orgs" {
			t.Errorf("unexpected path: %s", r.URL.Path)
			http.NotFound(w, r)
			return
		}
		if r.Header.Get("Authorization") != "token test-token" {
			t.Error("missing or wrong Authorization header")
		}

		orgs := []Org{
			{Name: "org1", FullName: "Organization 1"},
			{Name: "org2", FullName: "Organization 2"},
		}
		json.NewEncoder(w).Encode(orgs)
	}))
	defer server.Close()

	c := NewClient(server.URL)
	orgs, err := c.ListOrgs(context.Background(), "test-token")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if len(orgs) != 2 {
		t.Fatalf("got %d orgs, want 2", len(orgs))
	}
	if orgs[0].Name != "org1" {
		t.Errorf("orgs[0].Name = %q, want %q", orgs[0].Name, "org1")
	}
}

func TestListOrgs_Cached(t *testing.T) {
	callCount := 0
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		callCount++
		json.NewEncoder(w).Encode([]Org{{Name: "org1"}})
	}))
	defer server.Close()

	c := NewClient(server.URL)

	// First call should hit the server.
	_, err := c.ListOrgs(context.Background(), "test-token")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	// Second call should use cache.
	_, err = c.ListOrgs(context.Background(), "test-token")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if callCount != 1 {
		t.Errorf("server called %d times, want 1 (cached)", callCount)
	}
}

func TestListOrgRepos(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		repos := []Repo{
			{ID: 1, Name: "repo1", FullName: "org1/repo1"},
			{ID: 2, Name: "repo2", FullName: "org1/repo2"},
		}
		json.NewEncoder(w).Encode(repos)
	}))
	defer server.Close()

	c := NewClient(server.URL)
	repos, err := c.ListOrgRepos(context.Background(), "test-token", "org1")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if len(repos) != 2 {
		t.Fatalf("got %d repos, want 2", len(repos))
	}
}

func TestGetTriageQueue_Sorting(t *testing.T) {
	queue := []TriageItem{
		{Title: "low", Labels: []string{"P3"}, UpdatedAt: time.Now()},
		{Title: "high", Labels: []string{"P1"}, UpdatedAt: time.Now()},
		{Title: "medium", Labels: []string{"P2"}, UpdatedAt: time.Now()},
		{Title: "none", Labels: nil, UpdatedAt: time.Now()},
	}

	// Apply the same sort as GetTriageQueue.
	sortTriageQueue(queue)

	expected := []string{"high", "medium", "low", "none"}
	for i, item := range queue {
		if item.Title != expected[i] {
			t.Errorf("queue[%d].Title = %q, want %q", i, item.Title, expected[i])
		}
	}
}

func TestCloseIssue(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPatch {
			t.Errorf("expected PATCH, got %s", r.Method)
		}
		if r.URL.Path != "/api/v1/repos/owner1/repo1/issues/42" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}
		if r.Header.Get("Authorization") != "token test-token" {
			t.Error("missing or wrong Authorization header")
		}

		var body map[string]string
		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
			t.Fatalf("failed to decode body: %v", err)
		}
		if body["state"] != "closed" {
			t.Errorf("expected state=closed, got %q", body["state"])
		}

		w.WriteHeader(http.StatusOK)
		json.NewEncoder(w).Encode(map[string]string{"state": "closed"})
	}))
	defer server.Close()

	c := NewClient(server.URL)
	c.setCache("issues-org1", "should-be-invalidated")

	err := c.CloseIssue(context.Background(), "test-token", "owner1", "repo1", 42)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	// Verify cache was invalidated.
	_, ok := c.getFromCache("issues-org1")
	if ok {
		t.Error("expected cache to be invalidated after CloseIssue")
	}
}

func TestPostComment(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Errorf("expected POST, got %s", r.Method)
		}
		if r.URL.Path != "/api/v1/repos/owner1/repo1/issues/42/comments" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}

		var body map[string]string
		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
			t.Fatalf("failed to decode body: %v", err)
		}
		if body["body"] != "test comment" {
			t.Errorf("expected body='test comment', got %q", body["body"])
		}

		comment := map[string]interface{}{
			"id":   1,
			"body": body["body"],
			"user": map[string]string{"login": "testuser"},
			"created_at": "2026-03-26T12:00:00Z",
		}
		json.NewEncoder(w).Encode(comment)
	}))
	defer server.Close()

	c := NewClient(server.URL)
	c.setCache("issues-org1", "should-be-invalidated")

	comment, err := c.PostComment(context.Background(), "test-token", "owner1", "repo1", 42, "test comment")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if comment.Body != "test comment" {
		t.Errorf("comment.Body = %q, want %q", comment.Body, "test comment")
	}
	if comment.User != "testuser" {
		t.Errorf("comment.User = %q, want %q", comment.User, "testuser")
	}
	if comment.ID != 1 {
		t.Errorf("comment.ID = %d, want 1", comment.ID)
	}

	// Verify cache was invalidated.
	_, ok := c.getFromCache("issues-org1")
	if ok {
		t.Error("expected cache to be invalidated after PostComment")
	}
}

// sortTriageQueue is a test helper applying the same sort as GetTriageQueue.
func sortTriageQueue(queue []TriageItem) {
	for i := 0; i < len(queue); i++ {
		for j := i + 1; j < len(queue); j++ {
			pi := priorityScore(queue[i].Labels)
			pj := priorityScore(queue[j].Labels)
			if pj < pi || (pj == pi && queue[j].UpdatedAt.After(queue[i].UpdatedAt)) {
				queue[i], queue[j] = queue[j], queue[i]
			}
		}
	}
}