//! Tests for the admin messages of `admin.sock` and the two new error codes, against byte-exact
//! fixtures. Do not edit these or the fixtures.

use proto::{
    ApprovalList, Approve, ApproveResult, CallId, DataClass, DecisionRecord, DenyReason, Empty,
    Envelope, ErrorCode, GrantProblem, GrantsReport, Message, PendingApproval, Refuse, SessionId,
    Timestamp, WireError,
};

fn fixture(name: &str) -> String {
    let path = format!("{}/tests/fixtures/wire/{name}", env!("CARGO_MANIFEST_DIR"));
    let text = std::fs::read_to_string(&path).unwrap_or_else(|e| panic!("{path}: {e}"));
    text.trim_end_matches('\n').to_string()
}

/// The fixture must decode to `want`, and `want` must encode to exactly the fixture's bytes.
fn check(name: &str, id: u64, msg: Message) {
    let want = Envelope {
        v: 1,
        id,
        r#final: true,
        msg,
    };
    let text = fixture(name);
    let got: Envelope = serde_json::from_str(&text).unwrap_or_else(|e| panic!("{name}: {e}"));
    assert_eq!(got, want, "{name}: decoded value");
    assert_eq!(
        serde_json::to_string(&want).unwrap(),
        text,
        "{name}: encoded bytes"
    );
}

fn pending() -> PendingApproval {
    PendingApproval {
        approval: 41,
        session: SessionId::new("chat-1789700000-42").unwrap(),
        call: CallId(3),
        tool: "shell".to_string(),
        arguments: r#"{"command":"rm -rf /home/kyle/scratch/build","cwd":"/home/kyle/scratch"}"#
            .to_string(),
        grant: "shell-scratch".to_string(),
        taint: DataClass::Private,
        created: Timestamp::parse("2026-09-18T08:05:00.000Z").unwrap(),
        expires: Timestamp::parse("2026-09-18T08:20:00.000Z").unwrap(),
    }
}

#[test]
fn the_three_requests_with_an_empty_body() {
    check("approvals.json", 5, Message::Approvals(Empty {}));
    check("check_grants.json", 8, Message::CheckGrants(Empty {}));
    check("ok.json", 7, Message::Ok(Empty {}));
}

#[test]
fn approval_list() {
    let list = ApprovalList {
        items: vec![pending()],
    };
    check("approval_list.json", 5, Message::ApprovalList(list));
    let empty = ApprovalList { items: Vec::new() };
    check("approval_list_empty.json", 5, Message::ApprovalList(empty));
}

#[test]
fn approve_and_its_result() {
    check(
        "approve.json",
        6,
        Message::Approve(Approve { approval: 41 }),
    );
    check(
        "approve_result_allowed.json",
        6,
        Message::ApproveResult(ApproveResult {
            outcome: DecisionRecord::Allowed {},
        }),
    );
    check(
        "approve_result_denied.json",
        6,
        Message::ApproveResult(ApproveResult {
            outcome: DecisionRecord::Denied {
                reason: DenyReason::NoGrant,
            },
        }),
    );
}

#[test]
fn refuse_with_and_without_a_reason() {
    check(
        "refuse.json",
        7,
        Message::Refuse(Refuse {
            approval: 41,
            reason: Some("not while I am away".to_string()),
        }),
    );
    check(
        "refuse_no_reason.json",
        7,
        Message::Refuse(Refuse {
            approval: 41,
            reason: None,
        }),
    );
}

#[test]
fn grants_report() {
    let report = GrantsReport {
        problems: vec![
            GrantProblem {
                file: "notes-read.toml".to_string(),
                line: Some(3),
                problem: "unknown field `mdoe`".to_string(),
            },
            GrantProblem {
                file: "Bad_Name.toml".to_string(),
                line: None,
                problem: "the file name is not a valid grant id".to_string(),
            },
        ],
    };
    check("grants_report.json", 8, Message::GrantsReport(report));
    let ok = GrantsReport {
        problems: Vec::new(),
    };
    check("grants_report_ok.json", 8, Message::GrantsReport(ok));
}

#[test]
fn the_two_new_error_codes() {
    check(
        "error_forbidden.json",
        9,
        Message::Error(WireError {
            code: ErrorCode::Forbidden,
            detail: "approve is not accepted on broker.sock".to_string(),
        }),
    );
    check(
        "error_no_such_approval.json",
        6,
        Message::Error(WireError {
            code: ErrorCode::NoSuchApproval,
            detail: "41".to_string(),
        }),
    );
}

/// An empty body is an object with no keys: not `null`, not a missing body, not an object with a
/// key in it.
#[test]
fn an_empty_body_must_be_an_empty_object() {
    let good = fixture("approvals.json");
    assert!(serde_json::from_str::<Envelope>(&good).is_ok());
    let bad = [
        good.replacen("\"body\":{}", "\"body\":null", 1),
        good.replacen(",\"body\":{}", "", 1),
        good.replacen("\"body\":{}", "\"body\":{\"all\":true}", 1),
    ];
    for text in bad {
        assert_ne!(text, good);
        assert!(
            serde_json::from_str::<Envelope>(&text).is_err(),
            "accepted {text}"
        );
    }
}

/// `reason` and `line` may be null but may not be left out: every field is always written, so a
/// reader never has to guess what a missing one means.
#[test]
fn optional_fields_are_null_not_absent() {
    let refuse = fixture("refuse_no_reason.json");
    let cut = refuse.replacen(",\"reason\":null", "", 1);
    assert_ne!(cut, refuse);
    assert!(
        serde_json::from_str::<Envelope>(&cut).is_ok(),
        "serde reads a missing Option as None; this documents it"
    );
    assert!(
        serde_json::to_string(&Refuse {
            approval: 1,
            reason: None
        })
        .unwrap()
        .contains("\"reason\":null")
    );
    assert!(
        serde_json::to_string(&GrantProblem {
            file: "a.toml".to_string(),
            line: None,
            problem: "x".to_string()
        })
        .unwrap()
        .contains("\"line\":null")
    );
}

/// An outcome is strict too. serde does not apply `deny_unknown_fields` to unit variants such as
/// `allowed`, so `DecisionRecord` must not rely on the derive for it.
#[test]
fn an_outcome_rejects_unknown_and_misplaced_fields() {
    for good in [
        r#"{"outcome":"allowed"}"#,
        r#"{"outcome":"ask"}"#,
        r#"{"outcome":"denied","reason":"no_grant"}"#,
    ] {
        let value: DecisionRecord = serde_json::from_str(good).unwrap();
        assert_eq!(serde_json::to_string(&value).unwrap(), good);
    }
    for bad in [
        r#"{"outcome":"allowed","zz":1}"#,
        r#"{"outcome":"ask","zz":1}"#,
        r#"{"outcome":"denied","reason":"no_grant","zz":1}"#,
        r#"{"outcome":"allowed","reason":"no_grant"}"#,
        r#"{"outcome":"ask","reason":null,"zz":1}"#,
        r#"{"outcome":"allowed","reason":null}"#,
        r#"{"outcome":"denied"}"#,
        r#"{"outcome":"approved"}"#,
        r#"{"reason":"no_grant"}"#,
    ] {
        assert!(
            serde_json::from_str::<DecisionRecord>(bad).is_err(),
            "accepted {bad}"
        );
    }
}

#[test]
fn pending_approvals_reject_bad_values() {
    let good = fixture("approval_list.json");
    assert!(serde_json::from_str::<Envelope>(&good).is_ok());
    let bad = [
        // an approval id is a number
        good.replacen("\"approval\":41", "\"approval\":\"41\"", 1),
        // the session id is validated
        good.replacen("chat-1789700000-42", "../etc", 1),
        // the taint is one of the three classes
        good.replacen("\"taint\":\"private\"", "\"taint\":\"internal\"", 1),
        // a field is missing
        good.replacen("\"grant\":\"shell-scratch\",", "", 1),
        // a field nobody defined
        good.replacen("\"grant\":", "\"note\":1,\"grant\":", 1),
    ];
    for text in bad {
        assert_ne!(text, good);
        assert!(
            serde_json::from_str::<Envelope>(&text).is_err(),
            "accepted {text}"
        );
    }
}