use rustbot::bot::module::{Action, Chat, Command, Module};
use rustbot::bot::modules::karma::{extract_reason, format_event, parse_changes, Karma};

fn chat<'a>(sender: &'a str, text: &'a str) -> Chat<'a> {
    Chat {
        sender,
        reply_to: "#c",
        text,
        prefix: ">",
        network: "t",
    }
}

fn visible(s: &str) -> String {
    s.replace('\u{200B}', "")
}

fn reply_of(k: &mut Karma, name: &str, args: &[&str]) -> String {
    let cmd = Command {
        sender: "z",
        reply_to: "#c",
        name,
        args,
        prefix: ">",
        network: "t",
    };
    match k.on_command(&cmd).as_slice() {
        [Action::Reply(s)] => visible(s),
        _ => panic!("expected one reply"),
    }
}

#[test]
fn parses_increments_and_decrements() {
    assert_eq!(
        parse_changes("foo++ bar-- baz", "someone"),
        vec![("foo".to_string(), 1), ("bar".to_string(), -1)]
    );
}

#[test]
fn strips_trailing_punctuation_and_parens() {
    let c = parse_changes("nice work rust++, and (team)++!", "someone");
    assert!(c.contains(&("rust".to_string(), 1)), "{c:?}");
    assert!(c.contains(&("team".to_string(), 1)), "{c:?}");
}

#[test]
fn no_self_karma_case_insensitive() {
    assert!(parse_changes("me++", "me").is_empty());
    assert!(parse_changes("Me++", "me").is_empty());
}

#[test]
fn dedupes_within_a_message() {
    assert_eq!(
        parse_changes("foo++ foo++ foo++", "x"),
        vec![("foo".to_string(), 1)]
    );
}

#[test]
fn ignores_single_char_and_numeric_targets() {
    assert_eq!(
        parse_changes("i++ 5++ x-- ok++", "s"),
        vec![("ok".to_string(), 1)]
    );
}

#[test]
fn extract_reason_after_single_bump() {
    assert_eq!(
        extract_reason("rust++ for the clean PR").as_deref(),
        Some("the clean PR")
    );
    assert_eq!(
        extract_reason("rust++ because it's fast").as_deref(),
        Some("it's fast")
    );
    assert_eq!(
        extract_reason("rust++: solid docs").as_deref(),
        Some("solid docs")
    );
}

#[test]
fn extract_reason_none_when_ambiguous_or_absent() {
    assert_eq!(extract_reason("great work rust++"), None);
    assert_eq!(extract_reason("foo++ bar++ nice"), None);
    assert_eq!(extract_reason("just chatting"), None);
}

#[test]
fn bumps_persist_case_insensitively() {
    let path = std::env::temp_dir().join("rubot-test-karma-a.json");
    let _ = std::fs::remove_file(&path);
    let mut k = Karma::with_path(path.clone());
    k.on_message(&chat("alice", "Rust++ rust++ python--"));
    let reloaded = Karma::with_path(path.clone());
    assert_eq!(reloaded.get("rust"), 1);
    assert_eq!(reloaded.get("RUST"), 1);
    assert_eq!(reloaded.get("python"), -1);
    let _ = std::fs::remove_file(&path);
}

#[test]
fn report_shows_rank_and_reason() {
    let path = std::env::temp_dir().join("rubot-test-karma-rank.json");
    let _ = std::fs::remove_file(&path);
    let mut k = Karma::with_path(path.clone());
    k.on_message(&chat("alice", "rust++ for the clean PR"));
    k.on_message(&chat("carol", "rust++")); // no reason -> keeps alice's
    k.on_message(&chat("bob", "beta++"));
    let r = reply_of(&mut k, "karma", &["rust"]);
    assert!(r.contains("rust has 2 karma (#1 of 2)"), "{r}");
    assert!(r.contains("last: \"the clean PR\" (alice)"), "{r}");
    let _ = std::fs::remove_file(&path);
}

#[test]
fn unseen_thing_reports_no_karma() {
    let path = std::env::temp_dir().join("rubot-test-karma-unseen.json");
    let _ = std::fs::remove_file(&path);
    let mut k = Karma::with_path(path.clone());
    assert!(reply_of(&mut k, "karma", &["ghost"]).contains("no karma for 'ghost' yet"));
    let _ = std::fs::remove_file(&path);
}

#[test]
fn leaderboard_top_and_bottom() {
    let path = std::env::temp_dir().join("rubot-test-karma-top.json");
    let _ = std::fs::remove_file(&path);
    let mut k = Karma::with_path(path.clone());
    k.on_message(&chat("a", "high++ mid++ low--"));
    k.on_message(&chat("b", "high++"));
    let top = reply_of(&mut k, "karma", &[]);
    assert!(
        top.starts_with("karma top:") && top.contains("high (2)"),
        "{top}"
    );
    let bottom = reply_of(&mut k, "karmabottom", &[]);
    assert!(
        bottom.starts_with("karma bottom:") && bottom.contains("low (-1)"),
        "{bottom}"
    );
    let _ = std::fs::remove_file(&path);
}

#[test]
fn milestone_announced_at_ten() {
    let path = std::env::temp_dir().join("rubot-test-karma-ms.json");
    let _ = std::fs::remove_file(&path);
    let mut k = Karma::with_path(path.clone());
    for i in 0..9 {
        let s = format!("u{i}");
        assert!(
            k.on_message(&chat(&s, "rust++")).is_empty(),
            "announce at {i}"
        );
    }
    let a = k.on_message(&chat("u9", "rust++"));
    let msg = match a.as_slice() {
        [Action::Reply(s)] => visible(s),
        _ => panic!("expected a milestone announce"),
    };
    assert!(msg.contains("rust reached 10 karma"), "{msg}");
    let _ = std::fs::remove_file(&path);
}

#[test]
fn format_event_is_one_json_line() {
    let line = format_event(1700000000, "rust", 1, "alice", Some("clean PR"));
    assert!(line.ends_with('\n'));
    assert_eq!(line.matches('\n').count(), 1);
    assert!(line.contains("\"t\":1700000000"), "{line}");
    assert!(line.contains("\"o\":\"rust\""), "{line}");
    assert!(line.contains("\"d\":1"), "{line}");
    assert!(line.contains("\"by\":\"alice\""), "{line}");
    assert!(line.contains("\"why\":\"clean PR\""), "{line}");
    // no reason -> no why field
    let bare = format_event(1, "docs", -1, "bob", None);
    assert!(!bare.contains("why"), "{bare}");
    // quotes in a reason are escaped
    let q = format_event(1, "x", 1, "y", Some("he said \"hi\""));
    assert!(q.contains("\\\"hi\\\""), "{q}");
}

#[test]
fn on_message_appends_to_the_event_log() {
    let path = std::env::temp_dir().join("rubot-test-karma-ev.json");
    let log = std::env::temp_dir().join("rubot-test-karma-ev.events.jsonl");
    let _ = std::fs::remove_file(&path);
    let _ = std::fs::remove_file(&log);
    let mut k = Karma::with_path(path.clone());
    k.on_message(&chat("alice", "rust++ for the clean PR"));
    k.on_message(&chat("bob", "rust-- python++"));
    let body = std::fs::read_to_string(&log).expect("event log written");
    let lines: Vec<&str> = body.lines().collect();
    assert_eq!(lines.len(), 3, "one line per bump: {body}");
    assert!(lines[0].contains("\"o\":\"rust\"") && lines[0].contains("\"by\":\"alice\""));
    assert!(
        lines[0].contains("\"why\":\"the clean PR\""),
        "{}",
        lines[0]
    );
    // the two-bump message attributes no reason
    assert!(!lines[1].contains("why") && !lines[2].contains("why"));
    let _ = std::fs::remove_file(&path);
    let _ = std::fs::remove_file(&log);
}