//! View → Show Transparency Grid is engine view state of each open document (M3.88).

use serde_json::json;

use crate::*;

#[test]
fn transparency_grid_is_per_document_view_state() {
    let mut s = Session::new();
    s.execute("file.new", &json!({})).unwrap();
    let grid = |s: &Session| s.doc().unwrap().transparency_grid;
    assert!(!grid(&s));
    assert_eq!(s.execute("view.transparencyGrid", &json!({})).unwrap(), json!({"on": true}));
    assert!(grid(&s));
    // Not an edit: nothing to undo, the document stays clean, the journal skips it.
    let st = s.doc().unwrap();
    assert!(st.history.undo.is_empty() && !st.is_dirty());
    // Another document has its own setting.
    s.execute("file.new", &json!({})).unwrap();
    assert!(!grid(&s));
    assert_eq!(s.execute("view.transparencyGrid", &json!({"on": false})).unwrap(), json!({"on": false}));
    s.execute("document.activate", &json!({"index": 0})).unwrap();
    assert!(grid(&s));
    assert_eq!(s.execute("view.transparencyGrid", &json!({})).unwrap(), json!({"on": false}));
    assert_eq!(s.execute("view.transparencyGrid", &json!({"on": true})).unwrap(), json!({"on": true}));
    s.execute("document.activate", &json!({"index": 1})).unwrap();
    assert!(!grid(&s));
}

#[test]
fn invalid_transparency_grid_parameters_leave_the_view_unchanged() {
    let mut s = Session::new();
    s.execute("file.new", &json!({})).unwrap();
    for params in [json!({"on": "false"}), json!({"on": 1})] {
        assert!(s.execute("view.transparencyGrid", &params).is_err(), "accepted {params}");
        let st = s.doc().unwrap();
        assert!(!st.transparency_grid, "changed the grid for {params}");
        assert!(st.history.undo.is_empty() && !st.is_dirty(), "recorded an edit for {params}");
    }
    // Left out, or null as for every command, it toggles.
    assert_eq!(s.execute("view.transparencyGrid", &json!(null)).unwrap(), json!({"on": true}));
    assert_eq!(s.execute("view.transparencyGrid", &json!({"on": null})).unwrap(), json!({"on": false}));
}