use zagan_bet::client::ui::{
    command_names, completion_lines, display_width, first_contact_lines, format_pong,
    help_lines, host_lines, input_cursor_column, lines_to_move_up, parse_bet_arg, record_history,
};
use std::time::Duration;

#[test]
fn help_has_no_source_indentation() {
    for line in help_lines() {
        assert!(
            !line.starts_with("        "),
            "help line kept its source indentation: {line:?}"
        );
    }
}

#[test]
fn help_documents_every_command() {
    let help = help_lines().join("\n");
    for command in command_names() {
        assert!(help.contains(command), "help text is missing '{command}'");
    }
}

#[test]
fn completion_knows_every_command() {
    let commands = command_names();
    for expected in [
        "connect",
        "games",
        "play",
        "hosts",
        "send",
        "logout",
        "quit",
    ] {
        assert!(
            commands.contains(&expected),
            "tab completion is missing '{expected}'"
        );
    }
}

#[test]
fn history_records_a_command_once() {
    let mut history = Vec::new();
    record_history(&mut history, "info");
    record_history(&mut history, "info");

    assert_eq!(history, vec!["info"]);
}

#[test]
fn history_keeps_distinct_commands_in_order() {
    let mut history = Vec::new();
    record_history(&mut history, "info");
    record_history(&mut history, "ping");
    record_history(&mut history, "info");

    assert_eq!(history, vec!["info", "ping", "info"]);
}

#[test]
fn blank_commands_are_not_recorded() {
    let mut history = Vec::new();
    record_history(&mut history, "");
    record_history(&mut history, "   ");

    assert!(history.is_empty());
}

#[test]
fn bet_accepts_ten_or_more() {
    assert_eq!(parse_bet_arg("10"), Ok(10));
    assert_eq!(parse_bet_arg("50"), Ok(50));
    assert_eq!(parse_bet_arg(" 250 "), Ok(250));
}

#[test]
fn bet_rejects_less_than_ten() {
    assert!(parse_bet_arg("9").is_err());
    assert!(parse_bet_arg("0").is_err());
}

#[test]
fn bet_rejects_non_numbers() {
    assert!(parse_bet_arg("abc").is_err());
    assert!(parse_bet_arg("-50").is_err());
    assert!(parse_bet_arg("").is_err());
}

#[test]
fn redraw_moves_up_by_line_count_minus_one() {
    assert_eq!(lines_to_move_up(0), 0);
    assert_eq!(lines_to_move_up(1), 0);
    assert_eq!(lines_to_move_up(7), 6);
    assert_eq!(lines_to_move_up(70_000), u16::MAX);
}

#[test]
fn input_cursor_is_after_the_removed_character() {
    assert_eq!(input_cursor_column(10, 8), 18);
    assert_eq!(input_cursor_column(10, 0), 10);
    assert_eq!(input_cursor_column(2, 5), 7);
    assert_eq!(input_cursor_column(70_000, 70_000), u16::MAX);
}

#[test]
fn completions_wrap_within_the_requested_width() {
    let commands = command_names();
    let lines = completion_lines(&commands, 40);

    assert_eq!(lines.first().map(String::as_str), Some("Possible completions:"));
    for line in &lines[1..] {
        assert!(
            line.len() <= 40,
            "completion line is too wide ({} > 40): {line:?}",
            line.len()
        );
    }

    let listed: Vec<&str> = lines[1..]
        .iter()
        .flat_map(|line| line.split_whitespace())
        .collect();
    for command in commands {
        assert!(
            listed.contains(&command),
            "completion list is missing '{command}'"
        );
    }
}

#[test]
fn display_width_counts_terminal_columns_not_bytes() {
    assert_eq!(display_width("abc"), 3);
    assert_eq!(display_width("ąćęłńóśźż"), 9);
    assert_eq!(display_width("中"), 2);
    assert_eq!(display_width("🎉"), 2);
    assert_eq!(display_width("e\u{0301}"), 1);
}

#[test]
fn cursor_column_uses_display_width() {
    assert_eq!(input_cursor_column(2, display_width("ąć")), 4);
    assert_eq!(input_cursor_column(2, display_width("中")), 4);
}

#[test]
fn first_contact_message_stays_within_80_columns() {
    let fingerprint = "a4d6f80784154c2cb739a1df61ab3e9038ed731ee2e05c7611457ac741b3834c";
    let lines = first_contact_lines("127.0.0.1:11525", fingerprint);

    assert!(lines.iter().any(|line| line.contains("127.0.0.1:11525")));
    assert!(lines.iter().any(|line| line.contains(fingerprint)));
    for line in lines {
        assert!(
            line.len() <= 80,
            "first-contact line is too wide ({}): {line:?}",
            line.len()
        );
    }
}

#[test]
fn pong_is_formatted_to_one_decimal() {
    assert_eq!(format_pong(Duration::from_micros(144)), "Pong (0.1ms)");
    assert_eq!(format_pong(Duration::from_millis(41)), "Pong (41.0ms)");
}

#[test]
fn host_lines_fit_an_80_column_terminal() {
    let fingerprint = "a4d6f80784154c2cb739a1df61ab3e9038ed731ee2e05c7611457ac741b3834c";
    let lines = host_lines(&[
        (
            "127.0.0.1:11525".to_string(),
            Some(fingerprint.to_string()),
        ),
        ("unknown.example:443".to_string(), None),
    ]);

    assert!(lines.iter().any(|line| line.contains("127.0.0.1:11525")));
    assert!(lines.iter().any(|line| line.contains(fingerprint)));
    assert!(lines.iter().any(|line| line.contains("no fingerprint")));
    for line in lines {
        assert!(
            line.len() <= 80,
            "host line is too wide ({}): {line:?}",
            line.len()
        );
    }
}