use std::collections::BTreeMap;

use rand::seq::SliceRandom;
use rand::{Rng, SeedableRng};
use rand_xorshift::XorShiftRng;

use geom::{Angle, Duration, Time};
use map_model::Map;
use sim::{
    AgentID, CarID, ParkingSpot, PedestrianID, Person, PersonID, PersonState, TripEndpoint, TripID,
    TripMode, TripResult, VehicleType,
};
use widgetry::{
    Color, ControlState, CornerRounding, EdgeInsets, EventCtx, GeomBatch, Key, Line, RewriteColor,
    StyledButtons, Text, TextExt, TextSpan, Widget,
};

use crate::app::App;
use crate::info::{building, header_btns, make_table, make_tabs, trip, Details, OpenTrip, Tab};

pub fn trips(
    ctx: &mut EventCtx,
    app: &App,
    details: &mut Details,
    id: PersonID,
    open_trips: &mut BTreeMap<TripID, OpenTrip>,
    is_paused: bool,
) -> Vec<Widget> {
    let mut rows = header(
        ctx,
        app,
        details,
        id,
        Tab::PersonTrips(id, open_trips.clone()),
        is_paused,
    );

    let map = &app.primary.map;
    let sim = &app.primary.sim;
    let person = sim.get_person(id);

    // If there's at least one open trip, then we'll draw a route on the map. If so, add a dark
    // overlay for better contrast in the unzoomed view. Only add it once, even if multiple trips
    // are open.
    if !open_trips.is_empty() {
        details.unzoomed.push(
            app.cs.fade_map_dark,
            app.primary.map.get_boundary_polygon().clone(),
        );
    }

    // I'm sorry for bad variable names
    let mut wheres_waldo = true;
    for (idx, t) in person.trips.iter().enumerate() {
        let (trip_status, color, maybe_info) = match sim.trip_to_agent(*t) {
            TripResult::TripNotStarted => {
                if wheres_waldo {
                    wheres_waldo = false;
                    rows.push(current_status(ctx, person, map));
                }
                if sim.time() > sim.trip_info(*t).departure {
                    (
                        "delayed start",
                        Color::YELLOW,
                        open_trips
                            .get_mut(t)
                            .map(|open_trip| trip::future(ctx, app, *t, open_trip, details)),
                    )
                } else {
                    (
                        "future",
                        Color::hex("#4CA7E9"),
                        open_trips
                            .get_mut(t)
                            .map(|open_trip| trip::future(ctx, app, *t, open_trip, details)),
                    )
                }
            }
            TripResult::Ok(a) => {
                assert!(wheres_waldo);
                wheres_waldo = false;
                (
                    "ongoing",
                    Color::hex("#7FFA4D"),
                    open_trips
                        .get_mut(t)
                        .map(|open_trip| trip::ongoing(ctx, app, *t, a, open_trip, details)),
                )
            }
            TripResult::ModeChange => {
                // TODO No details. Weird case.
                assert!(wheres_waldo);
                wheres_waldo = false;
                (
                    "ongoing",
                    Color::hex("#7FFA4D"),
                    open_trips.get(t).map(|_| Widget::nothing()),
                )
            }
            TripResult::TripDone => {
                assert!(wheres_waldo);
                (
                    "finished",
                    Color::hex("#A3A3A3"),
                    if open_trips.contains_key(t) {
                        Some(trip::finished(ctx, app, id, open_trips, *t, details))
                    } else {
                        None
                    },
                )
            }
            TripResult::TripCancelled => {
                // Cancelled trips can happen anywhere in the schedule right now
                (
                    "cancelled",
                    Color::hex("#EB3223"),
                    open_trips
                        .get_mut(t)
                        .map(|open_trip| trip::cancelled(ctx, app, *t, open_trip, details)),
                )
            }
            TripResult::TripDoesntExist => unreachable!(),
        };
        let trip = sim.trip_info(*t);

        let (row_btn, _hitbox) = Widget::custom_row(vec![
            format!("Trip {} ", idx + 1)
                .batch_text(ctx)
                .centered_vert()
                .margin_right(21),
            Widget::row(vec![
                GeomBatch::load_svg(
                    ctx.prerender,
                    match trip.mode {
                        TripMode::Walk => "system/assets/meters/pedestrian.svg",
                        TripMode::Bike => "system/assets/meters/bike.svg",
                        TripMode::Drive => "system/assets/meters/car.svg",
                        TripMode::Transit => "system/assets/meters/bus.svg",
                    },
                )
                // we want the icon to be about the same height as the text
                .scale(0.75)
                // discard any padding built into the svg
                .autocrop()
                .color(RewriteColor::ChangeAll(color))
                .batch(),
                // Without this bottom padding, text is much closer to bottom of pill than top -
                // seemingly moreso than just text ascender/descender descrepancies - why?
                Line(trip_status)
                    .small()
                    .fg(color)
                    .batch(ctx)
                    .container()
                    .padding_bottom(2),
            ])
            .centered()
            .corner_rounding(CornerRounding::FullyRounded)
            .outline(1.0, color)
            .bg(color.alpha(0.2))
            .padding(EdgeInsets {
                top: 5.0,
                bottom: 5.0,
                left: 10.0,
                right: 10.0,
            })
            .margin_right(21),
            if trip.modified {
                Line("modified").batch(ctx).centered_vert().margin_right(15)
            } else {
                Widget::nothing()
            },
            if trip.capped {
                Line("capped").batch(ctx).centered_vert().margin_right(15)
            } else {
                Widget::nothing()
            },
            if trip_status == "finished" {
                if let Some(before) = app
                    .has_prebaked()
                    .and_then(|_| app.prebaked().finished_trip_time(*t))
                {
                    let (after, _, _) = app.primary.sim.finished_trip_details(*t).unwrap();
                    Text::from(cmp_duration_shorter(after, before))
                        .batch(ctx)
                        .centered_vert()
                } else {
                    Widget::nothing()
                }
            } else {
                Widget::nothing()
            },
            {
                let mut icon =
                    GeomBatch::load_svg(ctx.prerender, "../widgetry/icons/arrow_drop_down.svg")
                        .autocrop()
                        .color(RewriteColor::ChangeAll(Color::WHITE))
                        .scale(1.5);

                if !open_trips.contains_key(t) {
                    icon = icon.rotate(Angle::degrees(180.0));
                }

                icon.batch().container().align_right().margin_right(10)
            },
        ])
        .centered()
        .outline(2.0, Color::WHITE)
        .padding(16)
        .bg(app.cs.inner_panel)
        .to_geom(ctx, Some(0.3));
        rows.push(
            ctx.style()
                .btn_solid_light()
                .custom_batch(row_btn.clone(), ControlState::Default)
                .custom_batch(
                    row_btn.color(RewriteColor::Change(
                        app.cs.inner_panel,
                        ctx.style().btn_outline_light.bg_hover,
                    )),
                    ControlState::Hovered,
                )
                .build_widget(
                    ctx,
                    &format!(
                        "{} {}",
                        if open_trips.contains_key(t) {
                            "hide"
                        } else {
                            "show"
                        },
                        t
                    ),
                )
                .margin_above(if idx == 0 { 0 } else { 16 }),
        );

        if let Some(info) = maybe_info {
            rows.push(
                info.outline(2.0, Color::WHITE)
                    .bg(app.cs.inner_panel)
                    .padding(16),
            );

            let mut new_trips = open_trips.clone();
            new_trips.remove(t);
            details
                .hyperlinks
                .insert(format!("hide {}", t), Tab::PersonTrips(id, new_trips));
        } else {
            let mut new_trips = open_trips.clone();
            new_trips.insert(*t, OpenTrip::new());
            details
                .hyperlinks
                .insert(format!("show {}", t), Tab::PersonTrips(id, new_trips));
        }
    }
    if wheres_waldo {
        rows.push(current_status(ctx, person, map));
    }

    rows
}

pub fn bio(
    ctx: &mut EventCtx,
    app: &App,
    details: &mut Details,
    id: PersonID,
    is_paused: bool,
) -> Vec<Widget> {
    let mut rows = header(ctx, app, details, id, Tab::PersonBio(id), is_paused);
    let person = app.primary.sim.get_person(id);
    let mut rng = XorShiftRng::seed_from_u64(id.0 as u64);

    let mut svg_data = Vec::new();
    svg_face::generate_face(&mut svg_data, &mut rng).unwrap();
    let batch = GeomBatch::from_uncached_svg_contents(&svg_data).autocrop();
    let dims = batch.get_dims();
    let batch = batch.scale((200.0 / dims.width).min(200.0 / dims.height));
    rows.push(Widget::draw_batch(ctx, batch).centered_horiz());

    let nickname = petname::Petnames::default().generate(&mut rng, 2, " ");
    let age = rng.gen_range(5..100);

    let mut table = vec![("Nickname", nickname), ("Age", age.to_string())];
    if app.opts.dev {
        table.push(("Debug ID", format!("{:?}", person.orig_id)));
    }
    rows.extend(make_table(ctx, table));
    // TODO Mad libs!
    // - Keeps a collection of ___ at all times
    // - Origin story: accidentally fell into a vat of cheese curds
    // - Superpower: Makes unnervingly realistic squirrel noises
    // - Rides a fixie
    // - Has 17 pinky toe piercings (surprising, considering they're the state champ at
    // barefoot marathons)
    // TODO Favorite color: colors.lol

    if let Some(p) = app.primary.sim.get_pandemic_model() {
        // TODO add hospitalization/quarantine probably
        let status = if p.is_sane(id) {
            "Susceptible".to_string()
        } else if p.is_exposed(id) {
            format!("Exposed at {}", p.get_time(id).unwrap().ampm_tostring())
        } else if p.is_infectious(id) {
            format!("Infected at {}", p.get_time(id).unwrap().ampm_tostring())
        } else if p.is_recovered(id) {
            format!("Recovered at {}", p.get_time(id).unwrap().ampm_tostring())
        } else if p.is_dead(id) {
            format!("Dead at {}", p.get_time(id).unwrap().ampm_tostring())
        } else {
            // TODO More info here? Make these public too?
            "Other (hospitalized or quarantined)".to_string()
        };
        rows.push(
            Text::from_all(vec![
                Line("Pandemic model state: ").secondary(),
                Line(status),
            ])
            .draw(ctx),
        );
    }

    let mut has_bike = false;
    for v in &person.vehicles {
        if v.vehicle_type == VehicleType::Bike {
            has_bike = true;
        } else {
            if app.primary.sim.lookup_parked_car(v.id).is_some() {
                rows.push(
                    ctx.style()
                        .btn_solid_dark_text(&format!("Owner of {} (parked)", v.id))
                        .build_def(ctx),
                );
                details
                    .hyperlinks
                    .insert(format!("Owner of {} (parked)", v.id), Tab::ParkedCar(v.id));
            } else if let PersonState::Trip(t) = person.state {
                match app.primary.sim.trip_to_agent(t) {
                    TripResult::Ok(AgentID::Car(x)) if x == v.id => {
                        rows.push(format!("Owner of {} (currently driving)", v.id).draw_text(ctx));
                    }
                    _ => {
                        rows.push(format!("Owner of {} (off-map)", v.id).draw_text(ctx));
                    }
                }
            } else {
                rows.push(format!("Owner of {} (off-map)", v.id).draw_text(ctx));
            }
        }
    }
    if has_bike {
        rows.push("Owns a bike".draw_text(ctx));
    }

    rows
}

pub fn schedule(
    ctx: &mut EventCtx,
    app: &App,
    details: &mut Details,
    id: PersonID,
    is_paused: bool,
) -> Vec<Widget> {
    let mut rows = header(ctx, app, details, id, Tab::PersonSchedule(id), is_paused);
    let person = app.primary.sim.get_person(id);
    let mut rng = XorShiftRng::seed_from_u64(id.0 as u64);

    // TODO Proportional 24-hour timeline would be easier to understand
    let mut last_t = Time::START_OF_DAY;
    for t in &person.trips {
        let trip = app.primary.sim.trip_info(*t);
        let at = match trip.start {
            TripEndpoint::Bldg(b) => {
                let b = app.primary.map.get_b(b);
                if b.amenities.is_empty() {
                    b.address.clone()
                } else {
                    let list = b
                        .amenities
                        .iter()
                        .map(|a| a.names.get(app.opts.language.as_ref()))
                        .collect::<Vec<_>>();
                    format!("{} (at {})", list.choose(&mut rng).unwrap(), b.address)
                }
            }
            TripEndpoint::Border(_) => "off-map".to_string(),
            TripEndpoint::SuddenlyAppear(_) => "suddenly appear".to_string(),
        };
        rows.push(
            Text::from(Line(format!(
                "  Spends {} at {}",
                trip.departure - last_t,
                at
            )))
            .draw(ctx),
        );
        // TODO Ideally end time if we know
        last_t = trip.departure;
    }
    // Where do they spend the night?
    let last_trip = app.primary.sim.trip_info(*person.trips.last().unwrap());
    let at = match last_trip.end {
        TripEndpoint::Bldg(b) => {
            let b = app.primary.map.get_b(b);
            if b.amenities.is_empty() {
                b.address.clone()
            } else {
                let list = b
                    .amenities
                    .iter()
                    .map(|a| a.names.get(app.opts.language.as_ref()))
                    .collect::<Vec<_>>();
                format!("{} (at {})", list.choose(&mut rng).unwrap(), b.address)
            }
        }
        TripEndpoint::Border(_) => "off-map".to_string(),
        TripEndpoint::SuddenlyAppear(_) => "suddenly disappear".to_string(),
    };
    rows.push(
        Text::from(Line(format!(
            "  Spends {} at {}",
            app.primary.sim.get_end_of_day() - last_trip.departure,
            at
        )))
        .draw(ctx),
    );

    rows
}

pub fn crowd(
    ctx: &EventCtx,
    app: &App,
    details: &mut Details,
    members: &Vec<PedestrianID>,
) -> Vec<Widget> {
    let mut rows = vec![];

    rows.push(Widget::row(vec![
        Line("Pedestrian crowd").small_heading().draw(ctx),
        header_btns(ctx),
    ]));

    for (idx, id) in members.into_iter().enumerate() {
        let person = app
            .primary
            .sim
            .agent_to_person(AgentID::Pedestrian(*id))
            .unwrap();
        // TODO What other info is useful to summarize?
        rows.push(Widget::row(vec![
            format!("{})", idx + 1).draw_text(ctx).centered_vert(),
            ctx.style()
                .btn_outline_light_text(&person.to_string())
                .build_def(ctx),
        ]));
        details.hyperlinks.insert(
            person.to_string(),
            Tab::PersonTrips(
                person,
                OpenTrip::single(
                    app.primary
                        .sim
                        .agent_to_trip(AgentID::Pedestrian(*id))
                        .unwrap(),
                ),
            ),
        );
    }

    rows
}

pub fn parked_car(
    ctx: &mut EventCtx,
    app: &App,
    details: &mut Details,
    id: CarID,
    is_paused: bool,
) -> Vec<Widget> {
    let mut rows = vec![];

    rows.push(Widget::row(vec![
        Line(format!("Parked car #{}", id.0))
            .small_heading()
            .draw(ctx),
        Widget::row(vec![
            // Little indirect, but the handler of this action is actually the ContextualActions
            // for SandboxMode.
            if is_paused {
                ctx.style()
                    .btn_plain_light_icon("system/assets/tools/location.svg")
                    .hotkey(Key::F)
                    .build_widget(ctx, "follow (run the simulation)")
            } else {
                // TODO Blink
                ctx.style()
                    .btn_plain_light_icon("system/assets/tools/location.svg")
                    .image_color(Color::hex("#7FFA4D"), ControlState::Default)
                    .hotkey(Key::F)
                    .build_widget(ctx, "unfollow (pause the simulation)")
            },
            ctx.style().btn_close_widget(ctx),
        ])
        .align_right(),
    ]));

    // TODO prev trips, next trips, etc

    let p = app.primary.sim.get_owner_of_car(id).unwrap();
    rows.push(
        ctx.style()
            .btn_solid_dark_text(&format!("Owned by {}", p))
            .build_def(ctx),
    );
    details.hyperlinks.insert(
        format!("Owned by {}", p),
        Tab::PersonTrips(p, BTreeMap::new()),
    );

    if let Some(p) = app.primary.sim.lookup_parked_car(id) {
        match p.spot {
            ParkingSpot::Onstreet(_, _) | ParkingSpot::Lot(_, _) => {
                ctx.canvas.center_on_map_pt(
                    app.primary
                        .sim
                        .canonical_pt_for_agent(AgentID::Car(id), &app.primary.map)
                        .unwrap(),
                );
            }
            ParkingSpot::Offstreet(b, _) => {
                ctx.canvas
                    .center_on_map_pt(app.primary.map.get_b(b).polygon.center());
                rows.push(
                    format!("Parked inside {}", app.primary.map.get_b(b).address).draw_text(ctx),
                );
            }
        }

        rows.push(
            format!(
                "Parked here for {}",
                app.primary.sim.time() - p.parked_since
            )
            .draw_text(ctx),
        );
    } else {
        rows.push("No longer parked".draw_text(ctx));
    }

    rows
}

fn header(
    ctx: &mut EventCtx,
    app: &App,
    details: &mut Details,
    id: PersonID,
    tab: Tab,
    is_paused: bool,
) -> Vec<Widget> {
    let mut rows = vec![];

    let (current_trip, (descr, maybe_icon)) = match app.primary.sim.get_person(id).state {
        PersonState::Inside(b) => {
            ctx.canvas
                .center_on_map_pt(app.primary.map.get_b(b).label_center);
            building::draw_occupants(details, app, b, Some(id));
            (None, ("indoors", Some("system/assets/tools/home.svg")))
        }
        PersonState::Trip(t) => (
            Some(t),
            if let Some(a) = app.primary.sim.trip_to_agent(t).ok() {
                if let Some(pt) = app.primary.sim.canonical_pt_for_agent(a, &app.primary.map) {
                    ctx.canvas.center_on_map_pt(pt);
                }
                match a {
                    AgentID::Pedestrian(_) => {
                        ("walking", Some("system/assets/meters/pedestrian.svg"))
                    }
                    AgentID::Car(c) => match c.1 {
                        VehicleType::Car => ("driving", Some("system/assets/meters/car.svg")),
                        VehicleType::Bike => ("biking", Some("system/assets/meters/bike.svg")),
                        VehicleType::Bus | VehicleType::Train => unreachable!(),
                    },
                    AgentID::BusPassenger(_, _) => {
                        ("riding a bus", Some("system/assets/meters/bus.svg"))
                    }
                }
            } else {
                // TODO Really should clean up the TripModeChange issue
                ("...", None)
            },
        ),
        PersonState::OffMap => (None, ("off map", None)),
    };

    rows.push(Widget::custom_row(vec![
        Line(format!("{}", id)).small_heading().draw(ctx),
        if let Some(icon) = maybe_icon {
            let batch = GeomBatch::load_svg(ctx, icon)
                .color(RewriteColor::ChangeAll(Color::hex("#A3A3A3")))
                .autocrop();
            let y_factor = 20.0 / batch.get_dims().height;
            Widget::draw_batch(ctx, batch.scale(y_factor)).margin_left(28)
        } else {
            Widget::nothing()
        }
        .centered_vert(),
        Line(format!("{}", descr))
            .small_heading()
            .fg(Color::hex("#A3A3A3"))
            .draw(ctx)
            .margin_horiz(10),
        Widget::row(vec![
            // Little indirect, but the handler of this action is actually the ContextualActions
            // for SandboxMode.
            if is_paused {
                ctx.style()
                    .btn_plain_light_icon("system/assets/tools/location.svg")
                    .hotkey(Key::F)
                    .build_widget(ctx, "follow (run the simulation)")
            } else {
                // TODO Blink
                ctx.style()
                    .btn_plain_light_icon("system/assets/tools/location.svg")
                    .image_color(Color::hex("#7FFA4D"), ControlState::Default)
                    .hotkey(Key::F)
                    .build_widget(ctx, "unfollow (pause the simulation)")
            },
            ctx.style().btn_close_widget(ctx),
        ])
        .align_right(),
    ]));

    let open_trips = if let Some(t) = current_trip {
        OpenTrip::single(t)
    } else {
        BTreeMap::new()
    };
    let mut tabs = vec![
        ("Trips", Tab::PersonTrips(id, open_trips)),
        ("Bio", Tab::PersonBio(id)),
    ];
    if app.opts.dev {
        tabs.push(("Schedule", Tab::PersonSchedule(id)));
    }
    rows.push(make_tabs(ctx, &mut details.hyperlinks, tab, tabs));

    rows
}

fn current_status(ctx: &EventCtx, person: &Person, map: &Map) -> Widget {
    (match person.state {
        PersonState::Inside(b) => {
            // TODO hyperlink
            format!("Currently inside {}", map.get_b(b).address).draw_text(ctx)
        }
        PersonState::Trip(_) => unreachable!(),
        PersonState::OffMap => "Currently outside the map boundaries".draw_text(ctx),
    })
    .margin_vert(16)
}

// TODO Dedupe with the version in helpers
fn cmp_duration_shorter(after: Duration, before: Duration) -> TextSpan {
    if after.epsilon_eq(before) {
        Line("no change").small()
    } else if after < before {
        Line(format!("{} faster", before - after))
            .small()
            .fg(Color::GREEN)
    } else if after > before {
        Line(format!("{} slower", after - before))
            .small()
            .fg(Color::RED)
    } else {
        unreachable!()
    }
}