//! Integration tests for kei-ledger.
//!
//! Constructor Pattern: each test = one scenario, one assertion target.
//! Uses tempfile for per-test isolated sqlite file. Loads source modules
//! via `#[path]` so we don't need to expose a library crate surface.

#[path = "../src/schema.rs"]
mod schema;
#[path = "../src/ledger.rs"]
mod ledger;

use rusqlite::Connection;
use std::fs;
use std::path::{Path, PathBuf};
use tempfile::TempDir;

fn open_tmp() -> (TempDir, Connection) {
    let dir = tempfile::tempdir().unwrap();
    let db = dir.path().join("ledger.sqlite");
    let conn = ledger::open(&db).unwrap();
    (dir, conn)
}

fn write_artefacts(root: &Path, agent_id: &str, which: &[&str]) -> PathBuf {
    let base = root.join(".claude/agents").join(agent_id);
    fs::create_dir_all(&base).unwrap();
    for f in which {
        fs::write(base.join(f), b"x").unwrap();
    }
    base
}

#[test]
fn fork_then_done_marks_terminal() {
    let (_d, conn) = open_tmp();
    ledger::fork(&conn, "a1", "agent/a1", None, "deadbeef", None).unwrap();
    let running = ledger::list(&conn, Some("running")).unwrap();
    assert_eq!(running.len(), 1);
    assert_eq!(running[0].id, "a1");

    let updated = ledger::done(&conn, "a1", "shipped").unwrap();
    assert_eq!(updated, 1);
    let done = ledger::list(&conn, Some("done")).unwrap();
    assert_eq!(done.len(), 1);
    assert_eq!(done[0].summary.as_deref(), Some("shipped"));
}

#[test]
fn fail_flow_sets_reason_and_finished_ts() {
    let (_d, conn) = open_tmp();
    ledger::fork(&conn, "b1", "agent/b1", Some("main"), "cafebabe", None).unwrap();
    let updated = ledger::fail(&conn, "b1", "cargo build failed").unwrap();
    assert_eq!(updated, 1);
    let failed = ledger::list(&conn, Some("failed")).unwrap();
    assert_eq!(failed.len(), 1);
    assert!(failed[0].finished_ts.is_some());
    assert_eq!(failed[0].summary.as_deref(), Some("cargo build failed"));
}

#[test]
fn tree_walks_parent_child_chain() {
    let (_d, conn) = open_tmp();
    ledger::fork(&conn, "root", "agent/root", Some("main"), "aa", None).unwrap();
    ledger::fork(&conn, "c1", "agent/c1", Some("agent/root"), "bb", None).unwrap();
    ledger::fork(&conn, "c2", "agent/c2", Some("agent/root"), "cc", None).unwrap();
    ledger::fork(&conn, "g1", "agent/g1", Some("agent/c1"), "dd", None).unwrap();

    let t = ledger::tree(&conn, "root").unwrap();
    let ids: Vec<_> = t.iter().map(|a| a.id.as_str()).collect();
    assert!(ids.contains(&"root"));
    assert!(ids.contains(&"c1"));
    assert!(ids.contains(&"c2"));
    assert!(ids.contains(&"g1"));
    assert_eq!(ids[0], "root");
    assert_eq!(ids.len(), 4);
}

#[test]
fn list_filter_status_excludes_others() {
    let (_d, conn) = open_tmp();
    ledger::fork(&conn, "r1", "br-r1", None, "s1", None).unwrap();
    ledger::fork(&conn, "r2", "br-r2", None, "s2", None).unwrap();
    ledger::done(&conn, "r1", "ok").unwrap();
    let running = ledger::list(&conn, Some("running")).unwrap();
    assert_eq!(running.len(), 1);
    assert_eq!(running[0].id, "r2");
    let all = ledger::list(&conn, None).unwrap();
    assert_eq!(all.len(), 2);
}

#[test]
fn validate_detects_missing_artefacts() {
    let (d, _conn) = open_tmp();
    write_artefacts(d.path(), "v1", &["spec.md", "plan.md"]);
    let missing = ledger::validate(d.path(), "v1");
    assert_eq!(missing.len(), 4);
    assert!(missing.contains(&"progress.json".to_string()));
    assert!(missing.contains(&"review.md".to_string()));
}

#[test]
fn validate_ok_when_all_six_present() {
    let (d, _conn) = open_tmp();
    write_artefacts(
        d.path(),
        "v2",
        &[
            "spec.md",
            "plan.md",
            "progress.json",
            "chatlog.md",
            "handoffs.md",
            "review.md",
        ],
    );
    let missing = ledger::validate(d.path(), "v2");
    assert!(missing.is_empty(), "got missing {missing:?}");
}

#[test]
fn duplicate_fork_id_rejected() {
    let (_d, conn) = open_tmp();
    ledger::fork(&conn, "dup", "br1", None, "x", None).unwrap();
    let err = ledger::fork(&conn, "dup", "br2", None, "y", None);
    assert!(err.is_err(), "duplicate id must fail");
}

#[test]
fn done_on_already_done_agent_is_noop() {
    let (_d, conn) = open_tmp();
    ledger::fork(&conn, "n1", "br-n1", None, "h", None).unwrap();
    assert_eq!(ledger::done(&conn, "n1", "first").unwrap(), 1);
    assert_eq!(ledger::done(&conn, "n1", "second").unwrap(), 0);
    let row = &ledger::list(&conn, None).unwrap()[0];
    assert_eq!(row.summary.as_deref(), Some("first"));
}

#[test]
fn merged_after_done_transitions_status() {
    let (_d, conn) = open_tmp();
    ledger::fork(&conn, "m1", "br-m1", None, "h", None).unwrap();
    ledger::done(&conn, "m1", "ready").unwrap();
    assert_eq!(ledger::merged(&conn, "m1").unwrap(), 1);
    let merged = ledger::list(&conn, Some("merged")).unwrap();
    assert_eq!(merged.len(), 1);
    assert_eq!(merged[0].summary.as_deref(), Some("ready"));
}