// Copyright (c) 2024 Jason Witty <jasonpwitty+socktop@proton.me>.
// All rights reserved.
//
// Integration tests for configuration and constants

#![allow(clippy::assertions_on_constants)]

use std::time::Duration;

// Test that reasonable timeout values are used
#[test]
fn test_heartbeat_interval_reasonable() {
    // Heartbeat should be frequent enough to catch disconnects quickly
    // but not so frequent it creates unnecessary traffic
    const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(5);

    assert!(
        HEARTBEAT_INTERVAL.as_secs() >= 1,
        "Heartbeat interval too short"
    );
    assert!(
        HEARTBEAT_INTERVAL.as_secs() <= 30,
        "Heartbeat interval too long"
    );
}

#[test]
fn test_client_timeout_reasonable() {
    // Client timeout should be longer than heartbeat interval
    const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(5);
    const CLIENT_TIMEOUT: Duration = Duration::from_secs(10);

    assert!(
        CLIENT_TIMEOUT > HEARTBEAT_INTERVAL,
        "Client timeout must be longer than heartbeat interval"
    );
    assert!(CLIENT_TIMEOUT.as_secs() >= 5, "Client timeout too short");
    assert!(CLIENT_TIMEOUT.as_secs() <= 60, "Client timeout too long");
}

#[test]
fn test_idle_timeout_reasonable() {
    // Idle timeout should be long enough for legitimate use
    const IDLE_TIMEOUT: Duration = Duration::from_secs(300);

    assert!(IDLE_TIMEOUT.as_secs() >= 60, "Idle timeout too short");
    assert!(IDLE_TIMEOUT.as_secs() <= 3600, "Idle timeout too long");
}

#[test]
fn test_idle_check_interval_reasonable() {
    // Idle check should be frequent enough to be responsive
    // but not so frequent it wastes resources
    const IDLE_CHECK_INTERVAL: Duration = Duration::from_secs(30);
    const IDLE_TIMEOUT: Duration = Duration::from_secs(300);

    assert!(
        IDLE_CHECK_INTERVAL < IDLE_TIMEOUT,
        "Idle check interval must be less than idle timeout"
    );
    assert!(
        IDLE_CHECK_INTERVAL.as_secs() >= 10,
        "Idle check too frequent"
    );
    assert!(
        IDLE_CHECK_INTERVAL.as_secs() <= 120,
        "Idle check too infrequent"
    );
}

#[test]
fn test_timeout_relationships() {
    // Verify the logical relationship between different timeouts
    const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(5);
    const CLIENT_TIMEOUT: Duration = Duration::from_secs(10);
    const IDLE_CHECK_INTERVAL: Duration = Duration::from_secs(30);
    const IDLE_TIMEOUT: Duration = Duration::from_secs(300);

    // Client timeout should be at least 2x heartbeat interval
    assert!(
        CLIENT_TIMEOUT >= HEARTBEAT_INTERVAL * 2,
        "Client timeout should be at least 2x heartbeat interval"
    );

    // Idle timeout should be much longer than client timeout
    assert!(
        IDLE_TIMEOUT > CLIENT_TIMEOUT * 10,
        "Idle timeout should be significantly longer than client timeout"
    );

    // Idle check should be less than idle timeout
    assert!(
        IDLE_CHECK_INTERVAL < IDLE_TIMEOUT,
        "Idle check interval must be less than idle timeout"
    );
}

#[test]
fn test_pty_initial_size() {
    // Test that initial PTY size is reasonable
    const INITIAL_ROWS: u16 = 24;
    const INITIAL_COLS: u16 = 80;

    // Verify the constants are within reasonable ranges
    assert!(INITIAL_ROWS > 0, "Initial rows should be positive");
    assert!(INITIAL_COLS > 0, "Initial cols should be positive");
    assert!(INITIAL_ROWS <= 500, "Initial rows should not exceed 500");
    assert!(INITIAL_COLS <= 1000, "Initial cols should not exceed 1000");
}

#[test]
fn test_buffer_size() {
    // Test that buffer size for reading from PTY is reasonable
    const BUFFER_SIZE: usize = 8192;

    // Verify it's a power of 2 (which implies it's >= 1)
    assert!(
        BUFFER_SIZE.is_power_of_two(),
        "Buffer size should be power of 2"
    );
    // Verify it's in a reasonable range (power of 2 check above ensures >= 1)
    assert!(BUFFER_SIZE <= 65536, "Buffer too large for practical use");
}

// Test path validation
#[test]
fn test_template_path_format() {
    let template_path = "./templates/term.html";

    assert!(
        template_path.starts_with("./"),
        "Template path should be relative"
    );
    assert!(
        template_path.ends_with(".html"),
        "Template should be HTML file"
    );
}

#[test]
fn test_static_paths_format() {
    let static_paths = vec![
        "./static/terminal.js",
        "./static/terminado-addon.js",
        "./static/styles.css",
        "./static/bg.png",
        "./static/favicon.png",
    ];

    for path in static_paths {
        assert!(
            path.starts_with("./static/"),
            "Static file {} should be in ./static/ directory",
            path
        );
    }
}

// Test endpoint format
#[test]
fn test_endpoint_format() {
    let websocket_endpoint = "/websocket";
    let static_endpoint = "/static";
    let assets_endpoint = "/assets";

    assert!(
        websocket_endpoint.starts_with('/'),
        "Endpoint should start with /"
    );
    assert!(
        !websocket_endpoint.ends_with('/'),
        "Endpoint should not end with /"
    );

    assert!(
        static_endpoint.starts_with('/'),
        "Static endpoint should start with /"
    );
    assert!(
        assets_endpoint.starts_with('/'),
        "Assets endpoint should start with /"
    );
}

#[test]
fn test_default_shell() {
    let default_shell = "/bin/sh";

    assert!(
        default_shell.starts_with('/'),
        "Shell path should be absolute"
    );
    assert!(
        !default_shell.contains(' '),
        "Shell path should not contain spaces"
    );
}

#[test]
fn test_default_port() {
    let default_port: u16 = 8082;

    assert!(
        default_port >= 1024,
        "Port should not be in privileged range"
    );
    // Note: u16 max is 65535, so this is always true for u16
    // but we keep it for documentation purposes
}

#[test]
fn test_default_host() {
    let localhost = "127.0.0.1";
    let all_interfaces = "0.0.0.0";

    // Verify valid IP addresses
    assert_eq!(
        localhost.split('.').count(),
        4,
        "Localhost should have 4 octets"
    );
    assert_eq!(
        all_interfaces.split('.').count(),
        4,
        "0.0.0.0 should have 4 octets"
    );
}

// Test environment variables
#[test]
fn test_term_env_var() {
    let term_var = "xterm";

    // String literals are never empty, but we verify the expected value
    assert_eq!(term_var, "xterm", "TERM variable should be xterm");
    assert!(
        !term_var.contains(' '),
        "TERM variable should not contain spaces"
    );
}

// Test size boundaries
#[test]
fn test_terminal_size_boundaries() {
    // Minimum valid size
    let min_rows: u16 = 1;
    let min_cols: u16 = 1;

    assert!(min_rows > 0, "Minimum rows must be positive");
    assert!(min_cols > 0, "Minimum cols must be positive");

    // Maximum reasonable size
    let max_rows: u16 = 1000;
    let max_cols: u16 = 1000;

    assert!(max_rows < u16::MAX / 2, "Max rows should be reasonable");
    assert!(max_cols < u16::MAX / 2, "Max cols should be reasonable");
}

#[test]
fn test_zero_size_handling() {
    // Zero-sized terminals should be rejected
    let zero_rows: u16 = 0;
    let zero_cols: u16 = 0;

    // These would be rejected by the resize handler
    assert_eq!(zero_rows, 0);
    assert_eq!(zero_cols, 0);
    // In actual code, these should trigger an early return
}

// Test WebSocket message size limits
#[test]
fn test_message_size_reasonable() {
    // Messages should have reasonable size limits
    const MAX_MESSAGE_SIZE: usize = 1024 * 1024; // 1MB
    const MIN_MESSAGE_SIZE: usize = 8192; // 8KB
    const MAX_ALLOWED_SIZE: usize = 10 * 1024 * 1024; // 10MB

    // Verify the relationship between constants
    assert!(
        MAX_MESSAGE_SIZE >= MIN_MESSAGE_SIZE,
        "Max message size should be at least {} bytes",
        MIN_MESSAGE_SIZE
    );
    assert!(
        MAX_MESSAGE_SIZE <= MAX_ALLOWED_SIZE,
        "Max message size should not exceed {} bytes",
        MAX_ALLOWED_SIZE
    );
}
