// tests/integration_tests.rs
// ============================================================================
// Integration tests for MangoFetch CLI UI redesign
// Location: mangofetch-cli/tests/integration_tests.rs
// ============================================================================

#[cfg(test)]
mod tests {
    // Mock implementation for testing
    mod mocks {
        pub struct MockTheme;

        impl MockTheme {
            pub fn color_success() -> String {
                "\x1b[1;32m".to_string()
            }

            pub fn _color_error() -> String {
                "\x1b[1;31m".to_string()
            }

            pub fn color_reset() -> String {
                "\x1b[0m".to_string()
            }
        }
    }

    // ========================================================================
    // REPORTER TESTS
    // ========================================================================

    #[test]
    fn test_brutalist_theme_colors() {
        // Verify ANSI codes are valid
        let success = mocks::MockTheme::color_success();
        assert!(success.contains("\x1b"));
        assert!(success.len() > 2);
    }

    #[test]
    fn test_format_bytes() {
        fn format_bytes(bytes: u64) -> String {
            const UNITS: &[&str] = &["B", "KB", "MB", "GB"];
            let mut size = bytes as f64;
            let mut unit_idx = 0;

            while size >= 1024.0 && unit_idx < UNITS.len() - 1 {
                size /= 1024.0;
                unit_idx += 1;
            }

            if unit_idx == 0 {
                format!("{} {}", size as u64, UNITS[unit_idx])
            } else {
                format!("{:.1} {}", size, UNITS[unit_idx])
            }
        }

        assert_eq!(format_bytes(512), "512 B");
        assert_eq!(format_bytes(1024), "1.0 KB");
        assert_eq!(format_bytes(1_048_576), "1.0 MB");
        assert_eq!(format_bytes(1_073_741_824), "1.0 GB");
    }

    #[test]
    fn test_format_duration() {
        fn format_duration(seconds: u64) -> String {
            if seconds < 60 {
                format!("{}s", seconds)
            } else if seconds < 3600 {
                format!("{}m {}s", seconds / 60, seconds % 60)
            } else {
                let hours = seconds / 3600;
                let minutes = (seconds % 3600) / 60;
                format!("{}h {}m", hours, minutes)
            }
        }

        assert_eq!(format_duration(30), "30s");
        assert_eq!(format_duration(90), "1m 30s");
        assert_eq!(format_duration(3661), "1h 1m");
        assert_eq!(format_duration(7322), "2h 2m");
    }

    #[test]
    fn test_extract_platform() {
        fn extract_platform(url: &str) -> String {
            if url.contains("youtube.com") || url.contains("youtu.be") {
                "YouTube".to_string()
            } else if url.contains("instagram.com") {
                "Instagram".to_string()
            } else if url.contains("tiktok.com") {
                "TikTok".to_string()
            } else if url.contains("twitter.com") || url.contains("x.com") {
                "Twitter/X".to_string()
            } else {
                "Generic".to_string()
            }
        }

        assert_eq!(extract_platform("https://youtube.com/watch?v=123"), "YouTube");
        assert_eq!(extract_platform("https://youtu.be/123"), "YouTube");
        assert_eq!(extract_platform("https://www.instagram.com/reel/123/"), "Instagram");
        assert_eq!(extract_platform("https://www.tiktok.com/@user/video/123"), "TikTok");
        assert_eq!(extract_platform("https://twitter.com/user/status/123"), "Twitter/X");
        assert_eq!(extract_platform("https://x.com/user/status/123"), "Twitter/X");
        assert_eq!(extract_platform("https://example.com/file"), "Generic");
    }

    // ========================================================================
    // OUTPUT FORMATTER TESTS
    // ========================================================================

    #[test]
    fn test_format_info_card_structure() {
        let expected_parts = vec![
            "INFO",
            "MEDIA DETAIL",
            "TITLE:",
            "AUTHOR:",
            "PLATFORM:",
            "TYPE:",
            "DURATION:",
        ];

        for part in expected_parts {
            assert!(
                !part.is_empty(),
                "Card should contain {} section",
                part
            );
        }
    }

    #[test]
    fn test_json_parsing_simple() {
        let json_str = r#"{"key": "value", "number": 42}"#;
        let parsed: serde_json::Value = serde_json::from_str(json_str).unwrap();

        assert_eq!(parsed["key"], "value");
        assert_eq!(parsed["number"], 42);
    }

    #[test]
    fn test_json_parsing_nested() {
        let json_str = r#"{
            "download": {
                "output_dir": "/home/user/Downloads",
                "max_concurrent": 3
            }
        }"#;

        let parsed: serde_json::Value = serde_json::from_str(json_str).unwrap();

        assert_eq!(parsed["download"]["output_dir"], "/home/user/Downloads");
        assert_eq!(parsed["download"]["max_concurrent"], 3);
    }

    // ========================================================================
    // UI RENDERING TESTS
    // ========================================================================

    #[test]
    fn test_brutalist_separators() {
        let sep = "—".repeat(10);
        assert!(sep.contains("—"));
        assert_eq!(sep.chars().count(), 10);
    }

    #[test]
    fn test_emoji_availability() {
        let emojis = vec![
            "✓", 
            "✗", 
            "▶", 
            "○", 
            "🔍", 
            "⬇️", 
            "🔧", 
            "📋", 
            "📊", 
        ];

        for emoji in emojis {
            assert!(!emoji.is_empty());
        }
    }

    #[test]
    fn test_ansi_color_codes() {
        let codes = vec![
            ("\x1b[1;32m", "Bright Green"),
            ("\x1b[1;31m", "Bright Red"),
            ("\x1b[1;33m", "Bright Yellow"),
            ("\x1b[1;36m", "Bright Cyan"),
            ("\x1b[0m", "Reset"),
        ];

        for (code, _name) in codes {
            assert!(code.starts_with("\x1b"));
            assert!(code.contains("["));
        }
    }

    // ========================================================================
    // UTILITY FUNCTION TESTS
    // ========================================================================

    #[test]
    fn test_percentage_formatting() {
        fn format_percent(percent: f32) -> String {
            format!("{:>3}%", (percent * 100.0) as u32)
        }

        assert_eq!(format_percent(0.0), "  0%");
        assert_eq!(format_percent(0.5), " 50%");
        assert_eq!(format_percent(1.0), "100%");
    }

    #[test]
    fn test_table_alignment() {
        fn pad_right(s: &str, width: usize) -> String {
            format!("{:<width$}", s, width = width)
        }

        assert_eq!(pad_right("test", 10), "test      ");
        assert_eq!(pad_right("hello", 10), "hello     ");
        assert_eq!(pad_right("a", 5), "a    ");
    }

    #[test]
    fn test_truncate_string() {
        fn truncate(s: &str, max_len: usize) -> String {
            if s.len() > max_len {
                format!("{}...", &s[..max_len.saturating_sub(3)])
            } else {
                s.to_string()
            }
        }

        assert_eq!(
            truncate("This is a very long string", 10),
            "This is..."
        );
        assert_eq!(truncate("Short", 10), "Short");
        assert_eq!(truncate("Exact", 5), "Exact");
    }

    // ========================================================================
    // ERROR HANDLING TESTS
    // ========================================================================

    #[test]
    fn test_color_reset_always_present() {
        let colored_string = format!(
            "{}Success{}",
            mocks::MockTheme::color_success(),
            mocks::MockTheme::color_reset()
        );

        assert!(colored_string.ends_with("\x1b[0m"));
    }

    // ========================================================================
    // PERFORMANCE TESTS
    // ========================================================================

    #[test]
    fn test_color_code_generation_speed() {
        let start = std::time::Instant::now();

        for _ in 0..1000 {
            let _code = mocks::MockTheme::color_success();
        }

        let elapsed = start.elapsed();
        assert!(
            elapsed.as_micros() < 5000,
            "Color generation took too long: {:?}",
            elapsed
        );
    }

    #[test]
    fn test_string_formatting_performance() {
        let start = std::time::Instant::now();

        for i in 0..100 {
            let _s = format!("Download #{}: Speed: {:.1} MB/s", i, 1.5);
        }

        let elapsed = start.elapsed();
        assert!(
            elapsed.as_micros() < 10000,
            "Formatting took too long: {:?}",
            elapsed
        );
    }

    // ========================================================================
    // COMPATIBILITY TESTS
    // ========================================================================

    #[test]
    fn test_utf8_handling() {
        let test_strings = vec![
            "ASCII only",
            "Café with accents",
            "日本語 Japanese",
            "Émoji 🚀 support",
        ];

        for s in test_strings {
            assert_eq!(s, s); 
        }
    }

    #[test]
    fn test_platform_name_normalization() {
        fn normalize_platform(name: &str) -> String {
            name.to_lowercase()
        }

        assert_eq!(normalize_platform("YOUTUBE"), "youtube");
        assert_eq!(normalize_platform("TikTok"), "tiktok");
        assert_eq!(normalize_platform("instagram"), "instagram");
    }

    // ========================================================================
    // REGRESSION TESTS
    // ========================================================================

    #[test]
    fn test_no_color_output_when_disabled() {
        let should_not_contain_codes = vec![
            "Simple text",
            "No ANSI here",
        ];

        for text in should_not_contain_codes {
            assert!(!text.contains("\x1b"));
        }
    }

    #[test]
    fn test_consistent_spacing() {
        let line1 = format!("{:<5} {:<30} {:<15}", "ID", "Title", "Platform");
        let line2 = format!("{:<5} {:<30} {:<15}", "1", "Test Video", "YouTube");

        assert_eq!(line1.len(), line2.len());
    }
}
