package news

import (
	"os"
	"testing"
	"time"

	"dk/internal/database"
)

func setupTestDB(t *testing.T) *database.DB {
	testDB := "test_news.db"
	t.Cleanup(func() {
		os.Remove(testDB)
	})

	db, err := database.Open(testDB)
	if err != nil {
		t.Fatalf("Failed to open test database: %v", err)
	}

	// Create news table
	createTable := `CREATE TABLE news (
		id      INTEGER PRIMARY KEY AUTOINCREMENT,
		author  INTEGER NOT NULL,
		posted  INTEGER NOT NULL DEFAULT (unixepoch()),
		content TEXT NOT NULL
	)`

	if err := db.Exec(createTable); err != nil {
		t.Fatalf("Failed to create news table: %v", err)
	}

	// Insert test data with specific timestamps for predictable testing
	now := time.Now().Unix()
	testNews := `INSERT INTO news (author, posted, content) VALUES
		(1, ?, 'First news post about game updates'),
		(2, ?, 'Second post from different author'),
		(1, ?, 'Third post - recent update'),
		(3, ?, 'Fourth post from admin'),
		(2, ?, 'Fifth post - maintenance notice')`

	timestamps := []any{
		now - 86400*7, // 1 week ago
		now - 86400*5, // 5 days ago
		now - 86400*2, // 2 days ago
		now - 86400*1, // 1 day ago
		now - 3600,    // 1 hour ago
	}

	if err := db.Exec(testNews, timestamps...); err != nil {
		t.Fatalf("Failed to insert test news: %v", err)
	}

	return db
}

func TestFind(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	// Test finding existing news
	news, err := Find(db, 1)
	if err != nil {
		t.Fatalf("Failed to find news: %v", err)
	}

	if news.ID != 1 {
		t.Errorf("Expected ID 1, got %d", news.ID)
	}
	if news.Author != 1 {
		t.Errorf("Expected author 1, got %d", news.Author)
	}
	if news.Content != "First news post about game updates" {
		t.Errorf("Expected specific content, got '%s'", news.Content)
	}
	if news.Posted == 0 {
		t.Error("Expected non-zero posted timestamp")
	}

	// Test finding non-existent news
	_, err = Find(db, 999)
	if err == nil {
		t.Error("Expected error when finding non-existent news")
	}
}

func TestAll(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	newsPosts, err := All(db)
	if err != nil {
		t.Fatalf("Failed to get all news: %v", err)
	}

	if len(newsPosts) != 5 {
		t.Errorf("Expected 5 news posts, got %d", len(newsPosts))
	}

	// Check ordering (newest first)
	if len(newsPosts) >= 2 {
		if newsPosts[0].Posted < newsPosts[1].Posted {
			t.Error("Expected news to be ordered by posted time (newest first)")
		}
	}

	// First post should be the most recent (1 hour ago)
	if newsPosts[0].Content != "Fifth post - maintenance notice" {
		t.Errorf("Expected newest post first, got '%s'", newsPosts[0].Content)
	}
}

func TestByAuthor(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	// Test posts by author 1
	author1Posts, err := ByAuthor(db, 1)
	if err != nil {
		t.Fatalf("Failed to get news by author: %v", err)
	}

	if len(author1Posts) != 2 {
		t.Errorf("Expected 2 posts by author 1, got %d", len(author1Posts))
	}

	// Verify all posts are by author 1
	for _, post := range author1Posts {
		if post.Author != 1 {
			t.Errorf("Expected author 1, got %d", post.Author)
		}
	}

	// Check ordering (newest first)
	if len(author1Posts) == 2 {
		if author1Posts[0].Content != "Third post - recent update" {
			t.Errorf("Expected newest post by author 1 first")
		}
	}

	// Test author with no posts
	noPosts, err := ByAuthor(db, 999)
	if err != nil {
		t.Fatalf("Failed to query non-existent author: %v", err)
	}

	if len(noPosts) != 0 {
		t.Errorf("Expected 0 posts by non-existent author, got %d", len(noPosts))
	}
}

func TestRecent(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	// Test getting 3 most recent posts
	recentPosts, err := Recent(db, 3)
	if err != nil {
		t.Fatalf("Failed to get recent news: %v", err)
	}

	if len(recentPosts) != 3 {
		t.Errorf("Expected 3 recent posts, got %d", len(recentPosts))
	}

	// Check ordering (newest first)
	if len(recentPosts) >= 2 {
		if recentPosts[0].Posted < recentPosts[1].Posted {
			t.Error("Expected recent posts to be ordered newest first")
		}
	}

	// Test getting more posts than exist
	allRecentPosts, err := Recent(db, 10)
	if err != nil {
		t.Fatalf("Failed to get recent news with high limit: %v", err)
	}

	if len(allRecentPosts) != 5 {
		t.Errorf("Expected 5 posts (all available), got %d", len(allRecentPosts))
	}
}

func TestSince(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	// Test posts since 3 days ago
	threeDaysAgo := time.Now().AddDate(0, 0, -3).Unix()
	recentPosts, err := Since(db, threeDaysAgo)
	if err != nil {
		t.Fatalf("Failed to get news since timestamp: %v", err)
	}

	// Should get posts from 2 days ago, 1 day ago, and 1 hour ago
	expectedCount := 3
	if len(recentPosts) != expectedCount {
		t.Errorf("Expected %d posts since 3 days ago, got %d", expectedCount, len(recentPosts))
	}

	// Verify all posts are since the timestamp
	for _, post := range recentPosts {
		if post.Posted < threeDaysAgo {
			t.Errorf("Post with timestamp %d is before the 'since' timestamp %d", post.Posted, threeDaysAgo)
		}
	}

	// Test with future timestamp (should return no posts)
	futurePosts, err := Since(db, time.Now().AddDate(0, 0, 1).Unix())
	if err != nil {
		t.Fatalf("Failed to query future timestamp: %v", err)
	}

	if len(futurePosts) != 0 {
		t.Errorf("Expected 0 posts since future timestamp, got %d", len(futurePosts))
	}
}

func TestBetween(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	// Test posts between 6 days ago and 1 day ago
	start := time.Now().AddDate(0, 0, -6).Unix()
	end := time.Now().AddDate(0, 0, -1).Unix()

	betweenPosts, err := Between(db, start, end)
	if err != nil {
		t.Fatalf("Failed to get news between timestamps: %v", err)
	}

	// Should get posts from 5 days ago, 2 days ago, and 1 day ago
	expectedCount := 3
	if len(betweenPosts) != expectedCount {
		t.Errorf("Expected %d posts between timestamps, got %d", expectedCount, len(betweenPosts))
	}

	// Verify all posts are within the range
	for _, post := range betweenPosts {
		if post.Posted < start || post.Posted > end {
			t.Errorf("Post with timestamp %d is outside range [%d, %d]", post.Posted, start, end)
		}
	}

	// Test with narrow range (should return fewer posts)
	narrowStart := time.Now().AddDate(0, 0, -2).Unix()
	narrowEnd := time.Now().AddDate(0, 0, -1).Unix()

	narrowPosts, err := Between(db, narrowStart, narrowEnd)
	if err != nil {
		t.Fatalf("Failed to get news in narrow range: %v", err)
	}

	if len(narrowPosts) != 2 { // 2 days ago and 1 day ago
		t.Errorf("Expected 2 posts in narrow range, got %d", len(narrowPosts))
	}
}

func TestBuilder(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	// Create new news using builder
	testTime := time.Now()
	news, err := NewBuilder(db).
		WithAuthor(5).
		WithContent("Test news content from builder").
		WithPostedTime(testTime).
		Create()

	if err != nil {
		t.Fatalf("Failed to create news with builder: %v", err)
	}

	if news.ID == 0 {
		t.Error("Expected non-zero ID after creation")
	}
	if news.Author != 5 {
		t.Errorf("Expected author 5, got %d", news.Author)
	}
	if news.Content != "Test news content from builder" {
		t.Errorf("Expected specific content, got '%s'", news.Content)
	}
	if news.Posted != testTime.Unix() {
		t.Errorf("Expected posted time %d, got %d", testTime.Unix(), news.Posted)
	}

	// Verify it was saved to database
	foundNews, err := Find(db, news.ID)
	if err != nil {
		t.Fatalf("Failed to find created news: %v", err)
	}

	if foundNews.Content != "Test news content from builder" {
		t.Errorf("Created news not found in database")
	}

	// Test builder with default timestamp
	defaultNews, err := NewBuilder(db).
		WithAuthor(1).
		WithContent("News with default timestamp").
		Create()

	if err != nil {
		t.Fatalf("Failed to create news with default timestamp: %v", err)
	}

	// Should have recent timestamp (within last minute)
	if time.Since(defaultNews.PostedTime()) > time.Minute {
		t.Error("Expected default timestamp to be recent")
	}
}

func TestSave(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	news, err := Find(db, 1)
	if err != nil {
		t.Fatalf("Failed to find news: %v", err)
	}

	// Modify news
	news.Author = 999
	news.Content = "Updated content"
	news.Posted = time.Now().Unix()

	// Save changes
	err = news.Save()
	if err != nil {
		t.Fatalf("Failed to save news: %v", err)
	}

	// Verify changes were saved
	updatedNews, err := Find(db, 1)
	if err != nil {
		t.Fatalf("Failed to find updated news: %v", err)
	}

	if updatedNews.Author != 999 {
		t.Errorf("Expected updated author 999, got %d", updatedNews.Author)
	}
	if updatedNews.Content != "Updated content" {
		t.Errorf("Expected updated content, got '%s'", updatedNews.Content)
	}
}

func TestDelete(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	news, err := Find(db, 1)
	if err != nil {
		t.Fatalf("Failed to find news: %v", err)
	}

	// Delete news
	err = news.Delete()
	if err != nil {
		t.Fatalf("Failed to delete news: %v", err)
	}

	// Verify news was deleted
	_, err = Find(db, 1)
	if err == nil {
		t.Error("Expected error when finding deleted news")
	}
}

func TestUtilityMethods(t *testing.T) {
	db := setupTestDB(t)
	defer db.Close()

	news, _ := Find(db, 1)

	// Test PostedTime
	postedTime := news.PostedTime()
	if postedTime.IsZero() {
		t.Error("Expected non-zero posted time")
	}

	// Test IsRecent (should be false for old posts initially)
	if news.IsRecent() {
		t.Error("Expected old news post not to be recent")
	}

	// Test SetPostedTime
	newTime := time.Now().Add(-2 * time.Hour)
	news.SetPostedTime(newTime)
	if news.Posted != newTime.Unix() {
		t.Errorf("Expected posted timestamp %d, got %d", newTime.Unix(), news.Posted)
	}

	// Test IsRecent (should be true after setting to 2 hours ago)
	if !news.IsRecent() {
		t.Error("Expected news post from 2 hours ago to be recent")
	}

	// Create recent post
	recentNews, _ := NewBuilder(db).
		WithAuthor(1).
		WithContent("Recent post").
		Create()

	if !recentNews.IsRecent() {
		t.Error("Expected newly created post to be recent")
	}

	// Test Age
	age := news.Age()
	if age < 0 {
		t.Error("Expected positive age")
	}

	// Test IsAuthor
	if !news.IsAuthor(news.Author) {
		t.Error("Expected IsAuthor to return true for correct author")
	}
	if news.IsAuthor(999) {
		t.Error("Expected IsAuthor to return false for incorrect author")
	}

	// Test Preview
	longContent := "This is a very long content that should be truncated when preview is called"
	news.Content = longContent

	preview := news.Preview(20)
	if len(preview) > 20 {
		t.Errorf("Expected preview length <= 20, got %d", len(preview))
	}
	if preview[len(preview)-3:] != "..." {
		t.Error("Expected preview to end with ellipsis")
	}

	shortPreview := news.Preview(100) // Longer than content
	if shortPreview != longContent {
		t.Error("Expected short content to not be truncated")
	}

	// Test WordCount
	news.Content = "This is a test with five words"
	wordCount := news.WordCount()
	if wordCount != 7 {
		t.Errorf("Expected 7 words, got %d", wordCount)
	}

	news.Content = ""
	emptyWordCount := news.WordCount()
	if emptyWordCount != 0 {
		t.Errorf("Expected 0 words for empty content, got %d", emptyWordCount)
	}

	news.Content = "OneWord"
	oneWordCount := news.WordCount()
	if oneWordCount != 1 {
		t.Errorf("Expected 1 word, got %d", oneWordCount)
	}
}