use crate::{Apply, CommandError, FileId, State, WaypointId, set_waypoint_fields, update_waypoint};

/// Changes a waypoint of a file, whatever is selected (what the form of the waypoint tool does):
/// its name, description, icon, link, position and elevation. The strings that are empty remove
/// the field.
#[derive(Debug)]
pub struct EditWaypoint<'a> {
    pub file_id: FileId,
    pub waypoint_id: WaypointId,
    pub lng: f64,
    pub lat: f64,
    pub ele: f64,
    pub name: &'a str,
    pub desc: &'a str,
    pub icon: &'a str,
    pub link: &'a str,
}

impl Apply for EditWaypoint<'_> {
    fn apply(self, state: &mut State) -> Result<(), CommandError> {
        update_waypoint(state, self.file_id, self.waypoint_id, |wpt| {
            set_waypoint_fields(
                wpt,
                (self.lng, self.lat, self.ele),
                self.name,
                self.desc,
                self.icon,
                self.link,
            )
        })
    }
}

#[cfg(test)]
mod tests {
    use std::rc::Rc;

    use crate::{
        File, Link, Waypoint, WaypointChunk, engine::command::fixture::Fixture, waypoint_ids,
    };

    use super::*;

    #[test]
    fn test_edit_the_given_waypoint() {
        let mut fx = Fixture::default();
        let mut file = File::default();
        file.wpt.push(WaypointChunk {
            wpt: vec![
                Waypoint {
                    name: Some("old".into()),
                    desc: Some("old description".into()),
                    cmt: Some("old comment".into()),
                    sym: Some("Flag".into()),
                    links: vec![
                        Link {
                            href: "https://old".into(),
                            text: None,
                        },
                        Link {
                            href: "https://second".into(),
                            text: Some("second".into()),
                        },
                    ],
                    ..Default::default()
                },
                Waypoint {
                    name: Some("other".into()),
                    ..Default::default()
                },
            ],
            ..Default::default()
        });
        let id = file.id;
        let ids: Vec<_> = waypoint_ids(&file).collect();
        fx.files.insert(id, Rc::new(file));

        EditWaypoint {
            file_id: id,
            waypoint_id: ids[0],
            lng: 4.5,
            lat: 50.5,
            ele: 12.0,
            name: "new",
            desc: "new description",
            icon: "Summit",
            link: "",
        }
        .apply(&mut fx.state())
        .unwrap();

        let wpts: Vec<_> = fx.files[&id].wpt.iter().collect();
        let edited = wpts[0];
        assert_eq!(edited.id, ids[0]);
        assert_eq!(edited.name.as_deref(), Some("new"));
        assert_eq!(edited.desc.as_deref(), Some("new description"));
        assert_eq!(edited.cmt.as_deref(), Some("new description"));
        assert_eq!(edited.sym.as_deref(), Some("Summit"));
        // an empty link removes the first one, the others are not the form's business
        assert_eq!(edited.links.len(), 1);
        assert_eq!(edited.links[0].href, "https://second");
        assert_eq!(
            (edited.coordinates.lng, edited.coordinates.lat, edited.ele),
            (4.5, 50.5, 12.0)
        );
        // the other waypoint is as it was
        assert_eq!(wpts[1].name.as_deref(), Some("other"));
    }

    #[test]
    fn test_the_link_of_the_form_is_the_first_one() {
        let mut fx = Fixture::default();
        let mut file = File::default();
        file.wpt.push(WaypointChunk {
            wpt: vec![Waypoint {
                links: vec![
                    Link {
                        href: "https://first".into(),
                        text: Some("first".into()),
                    },
                    Link {
                        href: "https://second".into(),
                        text: None,
                    },
                ],
                ..Default::default()
            }],
            ..Default::default()
        });
        let (id, wpt_id) = (file.id, waypoint_ids(&file).next().unwrap());
        fx.files.insert(id, Rc::new(file));
        let edit = |fx: &mut Fixture, link: &str| {
            EditWaypoint {
                file_id: id,
                waypoint_id: wpt_id,
                lng: 0.0,
                lat: 0.0,
                ele: 0.0,
                name: "",
                desc: "",
                icon: "",
                link,
            }
            .apply(&mut fx.state())
            .unwrap();
            fx.files[&id].wpt.iter().next().unwrap().links.clone()
        };

        // the same link keeps its text
        let links = edit(&mut fx, "https://first");
        assert_eq!(links.len(), 2);
        assert_eq!(links[0].text.as_deref(), Some("first"));
        // another one replaces the first, and the text that described the old one
        let links = edit(&mut fx, "https://other");
        assert_eq!(links.len(), 2);
        assert_eq!(
            (links[0].href.as_str(), links[0].text.clone()),
            ("https://other", None)
        );
        assert_eq!(links[1].href, "https://second");
    }
}