flexi 0.7.0

use assert_cmd::Command;
use std::fs;
use std::path::Path;
use tempfile::tempdir;

// Helpers for log filter tests
fn write_log(dir: &Path, content: &str) {
    fs::create_dir_all(dir.join("flexi")).unwrap();
    fs::write(dir.join("flexi").join("flexi.txt"), content).unwrap();
}

fn log_lines(dir: &Path, args: &[&str]) -> Vec<String> {
    let mut full_args = vec!["log"];
    full_args.extend_from_slice(args);
    let out = flexi(&full_args, dir).success().get_output().stdout.clone();
    String::from_utf8_lossy(&out)
        .lines()
        .map(|l| l.to_string())
        .collect()
}

fn flexi(args: &[&str], data_dir: &Path) -> assert_cmd::assert::Assert {
    Command::cargo_bin("flexi")
        .unwrap()
        .env("XDG_DATA_HOME", data_dir)
        .env("XDG_CONFIG_HOME", data_dir)
        .args(args)
        .assert()
}

#[test]
fn display_fresh() {
    let dir = tempdir().unwrap();
    flexi(&[], dir.path()).success().stdout("0 min\n");
}

#[test]
fn add_and_display() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr", "30", "min"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("1 hr 30 min\n");
}

#[test]
fn add_compact_format() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1h30m"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("1 hr 30 min\n");
}

#[test]
fn remove_subtracts() {
    let dir = tempdir().unwrap();
    flexi(&["add", "2", "hr"], dir.path()).success();
    flexi(&["remove", "30", "min"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("1 hr 30 min\n");
}

#[test]
fn rm_alias_subtracts() {
    let dir = tempdir().unwrap();
    flexi(&["add", "2", "hr"], dir.path()).success();
    flexi(&["rm", "30", "min"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("1 hr 30 min\n");
}

#[test]
fn negative_balance() {
    let dir = tempdir().unwrap();
    flexi(&["rm", "1", "hr"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("-1 hr\n");
}

#[test]
fn set_exact_value() {
    let dir = tempdir().unwrap();
    flexi(&["add", "3", "hr"], dir.path()).success();
    flexi(&["set", "2", "hr"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("2 hr\n");
}

#[test]
fn reset_to_zero() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr", "30", "min"], dir.path()).success();
    flexi(&["reset"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("0 min\n");
}

#[test]
fn copy_prints_balance() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    flexi(&["copy"], dir.path()).success().stdout("1 hr\n");
}

#[test]
fn cp_alias_prints_balance() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    flexi(&["cp"], dir.path()).success().stdout("1 hr\n");
}

#[test]
fn add_prints_delta() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr", "30", "min"], dir.path())
        .success()
        .stdout("+1 hr 30 min → 1 hr 30 min\n");
}

#[test]
fn remove_prints_delta() {
    let dir = tempdir().unwrap();
    flexi(&["add", "2", "hr"], dir.path()).success();
    flexi(&["remove", "30", "min"], dir.path())
        .success()
        .stdout("-30 min → 1 hr 30 min\n");
}

#[test]
fn log_records_mutations() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    flexi(&["remove", "30", "min"], dir.path()).success();
    let out = flexi(&["log"], dir.path()).success().get_output().stdout.clone();
    let text = String::from_utf8_lossy(&out);
    let lines: Vec<&str> = text.lines().collect();
    assert_eq!(lines.len(), 2);
    assert!(lines[0].contains("+1 hr → 1 hr"));
    assert!(lines[1].contains("-30 min → 30 min"));
}

#[test]
fn undo_reverses_last_change() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    flexi(&["add", "30", "min"], dir.path()).success();
    flexi(&["undo"], dir.path()).success().stdout("-30 min → 1 hr\n");
    flexi(&[], dir.path()).success().stdout("1 hr\n");
}

#[test]
fn undo_empty_prints_message() {
    let dir = tempdir().unwrap();
    flexi(&["undo"], dir.path()).success().stdout("nothing to undo\n");
}

#[test]
fn negative_roundtrip() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr", "30", "min"], dir.path()).success();
    flexi(&["rm", "3", "hr"], dir.path()).success();
    flexi(&["rm", "1", "hr"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("-2 hr 30 min\n");
}

#[test]
fn reset_logs_set_zero() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    flexi(&["reset"], dir.path()).success();
    let out = flexi(&["log"], dir.path()).success().get_output().stdout.clone();
    let text = String::from_utf8_lossy(&out);
    let lines: Vec<&str> = text.lines().collect();
    assert_eq!(lines.len(), 2);
    assert!(lines[1].contains("= 0 min"));
}

#[test]
fn full_timestamp_format_round_trips() {
    let dir = tempdir().unwrap();
    fs::create_dir_all(dir.path().join("flexi")).unwrap();
    fs::write(
        dir.path().join("flexi").join("flexi.toml"),
        "timestamp_format = \"full\"\n",
    ).unwrap();
    flexi(&["add", "2", "hr"], dir.path()).success();
    flexi(&["add", "30", "min"], dir.path()).success();
    flexi(&[], dir.path()).success().stdout("2 hr 30 min\n");
    flexi(&["undo"], dir.path()).success().stdout("-30 min → 2 hr\n");
    flexi(&[], dir.path()).success().stdout("2 hr\n");
}

#[test]
fn hand_edited_log_with_spaces_is_readable() {
    let dir = tempdir().unwrap();
    fs::create_dir_all(dir.path().join("flexi")).unwrap();
    fs::write(
        dir.path().join("flexi").join("flexi.txt"),
        "2026-05-24 10:20 = 3 hr\n",
    ).unwrap();
    flexi(&[], dir.path()).success().stdout("3 hr\n");
}

#[test]
fn hand_edited_log_with_multiple_spaces_is_readable() {
    let dir = tempdir().unwrap();
    fs::create_dir_all(dir.path().join("flexi")).unwrap();
    fs::write(
        dir.path().join("flexi").join("flexi.txt"),
        "2026-05-24 10:20   = 3 hr\n",
    ).unwrap();
    flexi(&[], dir.path()).success().stdout("3 hr\n");
}

#[test]
fn hand_edited_log_with_tab_is_readable() {
    let dir = tempdir().unwrap();
    fs::create_dir_all(dir.path().join("flexi")).unwrap();
    fs::write(
        dir.path().join("flexi").join("flexi.txt"),
        "2026-05-24 10:20\t= 3 hr\n",
    ).unwrap();
    flexi(&[], dir.path()).success().stdout("3 hr\n");
}

#[test]
fn undo_after_set() {
    let dir = tempdir().unwrap();
    flexi(&["add", "2", "hr"], dir.path()).success();
    flexi(&["set", "30", "min"], dir.path()).success();
    flexi(&["undo"], dir.path()).success().stdout("+1 hr 30 min → 2 hr\n");
    flexi(&[], dir.path()).success().stdout("2 hr\n");
}

#[test]
fn undo_after_reset() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    flexi(&["reset"], dir.path()).success();
    flexi(&["undo"], dir.path()).success().stdout("+1 hr → 1 hr\n");
    flexi(&[], dir.path()).success().stdout("1 hr\n");
}

#[test]
fn full_timestamp_log_display_format() {
    let dir = tempdir().unwrap();
    fs::create_dir_all(dir.path().join("flexi")).unwrap();
    fs::write(
        dir.path().join("flexi").join("flexi.toml"),
        "timestamp_format = \"full\"\n",
    ).unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    let out = flexi(&["log"], dir.path()).success().get_output().stdout.clone();
    let text = String::from_utf8_lossy(&out);
    let line = text.lines().next().unwrap();
    // timestamp rendered as "YYYY-MM-DD HH:MM" regardless of stored format
    assert!(line.starts_with(&chrono::Local::now().format("%Y-%m-%d").to_string()));
    assert!(!line.contains('T'));
    assert!(line.contains("+1 hr → 1 hr"));
}

// --- log filter tests ---

#[test]
fn log_filter_today() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "2020-01-01 09:00 = 1 hr\n");
    flexi(&["add", "30", "min"], dir.path()).success();
    let lines = log_lines(dir.path(), &["--today"]);
    assert_eq!(lines.len(), 1);
    assert!(lines[0].contains("+30 min"));
}

#[test]
fn log_filter_day_alias() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "2020-01-01 09:00 = 1 hr\n");
    flexi(&["add", "30", "min"], dir.path()).success();
    let lines = log_lines(dir.path(), &["--day"]);
    assert_eq!(lines.len(), 1);
    assert!(lines[0].contains("+30 min"));
}

#[test]
fn log_filter_week() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "2020-01-01 09:00 = 1 hr\n");
    flexi(&["add", "30", "min"], dir.path()).success();
    let lines = log_lines(dir.path(), &["--week"]);
    assert_eq!(lines.len(), 1);
    assert!(lines[0].contains("+30 min"));
}

#[test]
fn log_filter_month() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "2020-01-01 09:00 = 1 hr\n");
    flexi(&["add", "30", "min"], dir.path()).success();
    let lines = log_lines(dir.path(), &["--month"]);
    assert_eq!(lines.len(), 1);
    assert!(lines[0].contains("+30 min"));
}

#[test]
fn log_filter_since() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "\
2026-05-01 09:00 = 1 hr\n\
2026-05-15 10:00 +30 min → 1 hr 30 min\n\
2026-06-01 09:00 +1 hr → 2 hr 30 min\n");
    let lines = log_lines(dir.path(), &["--since", "2026-05-10"]);
    assert_eq!(lines.len(), 2);
    assert!(lines[0].contains("2026-05-15"));
    assert!(lines[1].contains("2026-06-01"));
}

#[test]
fn log_filter_until() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "\
2026-05-01 09:00 = 1 hr\n\
2026-05-15 10:00 +30 min → 1 hr 30 min\n\
2026-06-01 09:00 +1 hr → 2 hr 30 min\n");
    let lines = log_lines(dir.path(), &["--until", "2026-05-20"]);
    assert_eq!(lines.len(), 2);
    assert!(lines[0].contains("2026-05-01"));
    assert!(lines[1].contains("2026-05-15"));
}

#[test]
fn log_filter_since_until_range() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "\
2026-05-01 09:00 = 1 hr\n\
2026-05-15 10:00 +30 min → 1 hr 30 min\n\
2026-06-01 09:00 +1 hr → 2 hr 30 min\n");
    let lines = log_lines(dir.path(), &["--since", "2026-05-10", "--until", "2026-05-20"]);
    assert_eq!(lines.len(), 1);
    assert!(lines[0].contains("2026-05-15"));
}

#[test]
fn log_filter_last() {
    let dir = tempdir().unwrap();
    flexi(&["add", "1", "hr"], dir.path()).success();
    flexi(&["add", "30", "min"], dir.path()).success();
    flexi(&["add", "15", "min"], dir.path()).success();
    let lines = log_lines(dir.path(), &["--last", "2"]);
    assert_eq!(lines.len(), 2);
    assert!(lines[0].contains("+30 min"));
    assert!(lines[1].contains("+15 min"));
}

#[test]
fn log_filter_last_with_since() {
    let dir = tempdir().unwrap();
    write_log(dir.path(), "\
2026-05-01 09:00 = 1 hr\n\
2026-05-10 10:00 +30 min → 1 hr 30 min\n\
2026-05-20 11:00 +15 min → 1 hr 45 min\n\
2026-05-25 12:00 +1 hr → 2 hr 45 min\n");
    let lines = log_lines(dir.path(), &["--since", "2026-05-05", "--last", "2"]);
    assert_eq!(lines.len(), 2);
    assert!(lines[0].contains("2026-05-20"));
    assert!(lines[1].contains("2026-05-25"));
}

#[test]
fn log_filter_week_start_sunday() {
    let dir = tempdir().unwrap();
    fs::create_dir_all(dir.path().join("flexi")).unwrap();
    fs::write(dir.path().join("flexi").join("flexi.toml"), "week_start = \"sunday\"\n").unwrap();
    write_log(dir.path(), "2020-01-01 09:00 = 1 hr\n");
    flexi(&["add", "30", "min"], dir.path()).success();
    let lines = log_lines(dir.path(), &["--week"]);
    assert_eq!(lines.len(), 1);
    assert!(lines[0].contains("+30 min"));
}