//! CLI tests (tech-spec §9): run the real `heph` binary against a real `hephd`
//! over a unix socket, and assert output + side effects (export files).

use std::path::PathBuf;
use std::process::Command;
use std::thread;
use std::time::Duration;

use tokio::net::UnixListener;

use heph_core::{FixedClock, LocalStore};
use hephd::Daemon;

const NOW: i64 = 1_704_067_200_000;

/// Spawn a daemon on its own thread+runtime; return (socket, tempdir).
fn spawn_daemon() -> (PathBuf, tempfile::TempDir) {
    let dir = tempfile::tempdir().unwrap();
    let db = dir.path().join("heph.db");
    let socket = dir.path().join("d.sock");

    let store = LocalStore::open(&db, Box::new(FixedClock(NOW))).unwrap();
    let socket_for_thread = socket.clone();
    thread::spawn(move || {
        let rt = tokio::runtime::Builder::new_current_thread()
            .enable_all()
            .build()
            .unwrap();
        rt.block_on(async move {
            let listener = UnixListener::bind(&socket_for_thread).unwrap();
            let _ = Daemon::new(store).serve(listener).await;
        });
    });
    for _ in 0..200 {
        if socket.exists() {
            break;
        }
        thread::sleep(Duration::from_millis(5));
    }
    (socket, dir)
}

/// Run the `heph` binary against `socket`; return (stdout, success).
fn heph(socket: &std::path::Path, args: &[&str]) -> (String, bool) {
    let out = Command::new(env!("CARGO_BIN_EXE_heph"))
        .arg("--socket")
        .arg(socket)
        .args(args)
        .output()
        .expect("run heph");
    (
        String::from_utf8_lossy(&out.stdout).into_owned(),
        out.status.success(),
    )
}

#[test]
fn task_then_next_shows_the_task() {
    let (socket, _dir) = spawn_daemon();

    let (out, ok) = heph(&socket, &["task", "Buy milk", "--attention", "red"]);
    assert!(ok, "task create failed: {out}");
    assert!(out.contains("Created task"), "{out}");

    let (out, ok) = heph(&socket, &["next"]);
    assert!(ok);
    assert!(out.contains("[red]"), "{out}");
    assert!(out.contains("Buy milk"), "{out}");
}

#[test]
fn next_on_empty_store_is_friendly() {
    let (socket, _dir) = spawn_daemon();
    let (out, ok) = heph(&socket, &["next"]);
    assert!(ok);
    assert!(out.contains("Nothing actionable"), "{out}");
}

/// The first whitespace token of a "Created task <id> …" line.
fn created_id(out: &str) -> String {
    out.split_whitespace()
        .nth(2)
        .expect("id in output")
        .to_string()
}

#[test]
fn task_with_iso_do_date_shows_formatted_date_in_next() {
    let (socket, _dir) = spawn_daemon();
    // A do-date in the past (relative to the daemon's fixed 2024-01-01 clock)
    // so it is actionable and appears in `next`.
    let (out, ok) = heph(
        &socket,
        &[
            "task",
            "Renew passport",
            "-a",
            "orange",
            "--do-date",
            "2023-12-25",
        ],
    );
    assert!(ok, "{out}");

    let (out, ok) = heph(&socket, &["next"]);
    assert!(ok);
    assert!(out.contains("Renew passport"), "{out}");
    // Within 2023 vs the 2024 clock → full YYYY-MM-DD form.
    assert!(
        out.contains("do:2023-12-25"),
        "expected formatted do-date: {out}"
    );
}

#[test]
fn edit_reschedules_and_clears_fields() {
    let (socket, _dir) = spawn_daemon();
    let (out, _) = heph(
        &socket,
        &[
            "task",
            "Taxes",
            "--do-date",
            "2023-01-01",
            "--recur",
            "yearly",
        ],
    );
    let id = created_id(&out);

    // Reschedule do-date and clear recurrence.
    let (out, ok) = heph(
        &socket,
        &["edit", &id, "--do-date", "2023-06-01", "--recur", "none"],
    );
    assert!(ok, "{out}");

    let (out, ok) = heph(&socket, &["show", &id]);
    assert!(ok, "{out}");
    assert!(
        out.contains("\"recurrence\": null"),
        "recurrence cleared: {out}"
    );
    assert!(out.contains("\"do_date\""), "{out}");
}

#[test]
fn list_and_done_and_health() {
    let (socket, _dir) = spawn_daemon();
    let (out, _) = heph(&socket, &["task", "Mow lawn", "-a", "red"]);
    let id = created_id(&out);

    let (out, ok) = heph(&socket, &["list"]);
    assert!(ok, "{out}");
    assert!(out.contains("Mow lawn"), "{out}");

    let (out, ok) = heph(&socket, &["health"]);
    assert!(ok, "{out}");
    assert!(out.contains("active"), "{out}");

    let (out, ok) = heph(&socket, &["done", &id]);
    assert!(ok, "{out}");
    assert!(out.contains("done"), "{out}");

    // Done tasks drop out of `next`.
    let (out, ok) = heph(&socket, &["next"]);
    assert!(ok);
    assert!(
        !out.contains("Mow lawn"),
        "completed task should be gone: {out}"
    );
}

#[test]
fn recur_preset_makes_a_recurring_task() {
    let (socket, _dir) = spawn_daemon();
    let (out, _) = heph(&socket, &["task", "Standup", "--recur", "weekdays"]);
    let id = created_id(&out);
    let (out, ok) = heph(&socket, &["show", &id]);
    assert!(ok, "{out}");
    assert!(out.contains("FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR"), "{out}");
}

#[test]
fn project_add_then_file_a_task_under_it() {
    let (socket, _dir) = spawn_daemon();
    let (out, ok) = heph(&socket, &["project", "add", "Maintenance"]);
    assert!(ok, "{out}");

    // A task can be filed under the project by name.
    let (out, ok) = heph(
        &socket,
        &["task", "Replace filter", "--project", "Maintenance"],
    );
    assert!(ok, "{out}");

    // An unknown project name is a clear error, not a silent miss.
    let (out, ok) = heph(&socket, &["task", "Whatever", "--project", "Nonexistent"]);
    assert!(!ok, "expected failure for unknown project: {out}");
}

#[test]
fn project_list_shows_projects_only() {
    let (socket, _dir) = spawn_daemon();
    heph(&socket, &["project", "add", "Maintenance"]);
    heph(&socket, &["project", "add", "Coding"]);
    // A task (and its context doc) must not show up in the project list.
    heph(&socket, &["task", "Some task"]);

    let (out, ok) = heph(&socket, &["project", "list"]);
    assert!(ok, "{out}");
    assert!(out.contains("Maintenance"), "{out}");
    assert!(out.contains("Coding"), "{out}");
    assert!(!out.contains("Some task"), "tasks are not projects: {out}");
}

#[test]
fn log_append_then_tail() {
    let (socket, _dir) = spawn_daemon();
    let (out, _) = heph(&socket, &["task", "Investigate bug"]);
    let id = created_id(&out);

    let (_, ok) = heph(
        &socket,
        &["log", &id, "looked", "at", "the", "stack", "trace"],
    );
    assert!(ok);
    let (out, ok) = heph(&socket, &["log", &id]);
    assert!(ok, "{out}");
    assert!(out.contains("looked at the stack trace"), "{out}");
}

#[test]
fn export_writes_markdown_files() {
    let (socket, dir) = spawn_daemon();
    heph(&socket, &["doc", "Roof log", "--body", "# Roof"]);

    let export_dir = dir.path().join("export");
    let (out, ok) = heph(&socket, &["export", export_dir.to_str().unwrap()]);
    assert!(ok, "export failed: {out}");
    assert!(out.contains("Exported 1 nodes"), "{out}");

    // The doc landed as a .md file under doc/.
    let docs: Vec<_> = std::fs::read_dir(export_dir.join("doc"))
        .unwrap()
        .filter_map(|e| e.ok())
        .collect();
    assert_eq!(docs.len(), 1);
    let text = std::fs::read_to_string(docs[0].path()).unwrap();
    assert!(text.contains("title: \"Roof log\""), "{text}");
}