/*
    Hurry Curry! - a game about cooking
    Copyright 2024 metamuffin

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, version 3 of the License only.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

*/
use crate::{
    helper::InterpolateExt,
    network::Network,
    render::{
        misc::MiscTextures,
        sprite::{Sprite, SpriteDraw},
        AtlasLayout, SpriteRenderer,
    },
    tilemap::Tilemap,
};
use hurrycurry_protocol::{
    glam::{IVec2, Vec2},
    movement::MovementBase,
    ClientGamedata, ItemIndex, ItemLocation, PacketC, PacketS, PlayerID, TileIndex,
};
use log::{info, warn};
use sdl2::{
    keyboard::{KeyboardState, Scancode},
    rect::Rect,
};
use std::collections::{HashMap, HashSet};

pub struct Game {
    network: Network,

    data: ClientGamedata,
    tiles: HashMap<IVec2, Tile>,
    tilemap: Tilemap,
    collision_map: HashSet<IVec2>,
    players: HashMap<PlayerID, Player>,
    player_ids: HashSet<PlayerID>,
    items_removed: Vec<Item>,
    my_id: PlayerID,

    camera_center: Vec2,
    misc_textures: MiscTextures,
    item_sprites: Vec<Sprite>,
    movement_send_cooldown: f32,
    interacting: bool,
    score: Score,
}

#[derive(Debug, Default)]
pub struct Score {
    points: i64,
    demands_failed: usize,
    demands_completed: usize,
    time_remaining: f32,
}

pub struct Tile {
    _kind: TileIndex,
    item: Option<Item>,
}

pub struct Player {
    movement: MovementBase,
    item: Option<Item>,
    _name: String,
    _character: i32,
}

pub struct Item {
    position: Vec2,
    parent_position: Vec2,
    kind: ItemIndex,
    alive: f32,
    progress: Option<(f32, bool)>,
}

impl Game {
    pub fn new(mut network: Network, layout: &AtlasLayout) -> Self {
        network
            .queue_out
            .push_back(hurrycurry_protocol::PacketS::Join {
                name: "light".to_string(),
                character: 0,
            });

        Self {
            network,
            tiles: HashMap::new(),
            players: HashMap::new(),
            tilemap: Tilemap::default(),
            my_id: PlayerID(0),
            data: ClientGamedata::default(),
            collision_map: HashSet::new(),
            movement_send_cooldown: 0.,
            misc_textures: MiscTextures::init(layout),
            item_sprites: Vec::new(),
            items_removed: Vec::new(),
            interacting: false,
            score: Score::default(),
            player_ids: HashSet::new(),
            camera_center: Vec2::ZERO,
        }
    }

    pub fn tick(&mut self, dt: f32, keyboard: &KeyboardState, layout: &AtlasLayout) {
        self.network.poll();

        // TODO perf
        for packet in self.network.queue_in.drain(..).collect::<Vec<_>>() {
            self.packet_in(packet, layout);
        }

        let mut direction = IVec2::new(
            keyboard.is_scancode_pressed(Scancode::D) as i32
                - keyboard.is_scancode_pressed(Scancode::A) as i32,
            keyboard.is_scancode_pressed(Scancode::S) as i32
                - keyboard.is_scancode_pressed(Scancode::W) as i32,
        )
        .as_vec2();
        let boost = keyboard.is_scancode_pressed(Scancode::K);
        let interact = keyboard.is_scancode_pressed(Scancode::Space)
            | keyboard.is_scancode_pressed(Scancode::J);

        if interact {
            direction *= 0.;
        }

        self.movement_send_cooldown -= dt;
        let send_movement = self.movement_send_cooldown < 0.;
        if send_movement {
            self.movement_send_cooldown += 0.04
        }

        self.score.time_remaining -= dt;
        self.score.time_remaining -= self.score.time_remaining.max(0.);

        if interact != self.interacting {
            if interact {
                self.network.queue_out.push_back(PacketS::Interact {
                    pos: Some(self.players[&self.my_id].movement.get_interact_target()),
                });
            } else {
                self.network
                    .queue_out
                    .push_back(PacketS::Interact { pos: None });
            }
            self.interacting = interact;
        }

        if let Some(player) = self.players.get_mut(&self.my_id) {
            let movement_packet = player
                .movement
                .update(&self.collision_map, direction, boost, dt);
            if send_movement {
                self.network.queue_out.push_back(movement_packet);
            }

            self.camera_center.exp_to(player.movement.position, dt * 5.);
        }

        for player in self.players.values_mut() {
            if let Some(item) = &mut player.item {
                item.parent_position = player.movement.position;
                item.tick(1., dt);
            }
        }
        for tile in self.tiles.values_mut() {
            if let Some(item) = &mut tile.item {
                item.tick(1., dt)
            }
        }
        self.items_removed.retain_mut(|i| {
            i.tick(0., dt);
            i.alive > 0.01
        })
    }

    pub fn packet_in(&mut self, packet: PacketC, layout: &AtlasLayout) {
        match packet {
            PacketC::Init { id } => self.my_id = id,
            PacketC::Data { data } => {
                self.tilemap.init(&data.tile_names, layout);
                self.item_sprites = data
                    .item_names
                    .iter()
                    .map(|name| {
                        Sprite::new(
                            layout
                                .get(&format!("{name}+a"))
                                .copied()
                                .unwrap_or_else(|| {
                                    warn!("no sprite for item {name:?}");
                                    Rect::new(0, 0, 32, 24)
                                }),
                            Vec2::new(0., 0.0),
                            0.1,
                        )
                    })
                    .collect();
                self.data = data;
            }
            PacketC::UpdateMap {
                tile,
                kind,
                neighbors,
            } => {
                if let Some(kind) = kind {
                    self.tiles.insert(
                        tile,
                        Tile {
                            _kind: kind,
                            item: None,
                        },
                    );
                    if self.data.tile_collide[kind.0] {
                        self.collision_map.remove(&tile);
                    } else {
                        self.collision_map.insert(tile);
                    }
                } else {
                    self.tiles.remove(&tile);
                    self.collision_map.remove(&tile);
                }
                self.tilemap.set(tile, kind, neighbors);
            }
            PacketC::AddPlayer {
                id,
                position,
                character,
                name,
            } => {
                info!("add player {} {name:?}", id.0);
                self.players.insert(
                    id,
                    Player {
                        _character: character,
                        _name: name,
                        item: None,
                        movement: MovementBase {
                            position,
                            facing: Vec2::X,
                            rotation: 0.,
                            velocity: Vec2::ZERO,
                            boosting: false,
                            stamina: 0.,
                        },
                    },
                );
                self.player_ids.insert(id);
            }
            PacketC::RemovePlayer { id } => {
                info!("remove player {}", id.0);
                self.player_ids.remove(&id);
                self.players.remove(&id);
            }
            PacketC::Position {
                player,
                pos,
                rot,
                boosting,
            } => {
                if player != self.my_id {
                    if let Some(p) = self.players.get_mut(&player) {
                        p.movement.position = pos;
                        p.movement.rotation = rot;
                        p.movement.boosting = boosting;
                    }
                }
            }
            PacketC::MoveItem { from, to } => {
                let mut item = self.get_item(from).take();
                if let Some(item) = &mut item {
                    item.parent_position = self.get_location_position(to);
                }
                *self.get_item(to) = item;
            }
            PacketC::SetItem { location, item } => {
                let position = self.get_location_position(location);
                let slot = match location {
                    ItemLocation::Tile(pos) => &mut self.tiles.get_mut(&pos).unwrap().item,
                    ItemLocation::Player(pid) => &mut self.players.get_mut(&pid).unwrap().item,
                };
                self.items_removed.extend(slot.take());
                *slot = item.map(|kind| Item {
                    kind,
                    parent_position: position,
                    alive: 0.,
                    position,
                    progress: None,
                })
            }
            PacketC::SetProgress {
                item,
                progress,
                warn,
            } => {
                self.get_item(item).as_mut().unwrap().progress = progress.map(|s| (s, warn));
            }
            PacketC::Collide {
                player: _,
                force: _,
            } => (),
            PacketC::Communicate { .. } => {
                // TODO
            }
            PacketC::ServerMessage { text: _ } => {
                // TODO
            }
            PacketC::Score {
                points,
                demands_failed,
                demands_completed,
                time_remaining,
            } => {
                self.score.points = points;
                self.score.demands_completed = demands_completed;
                self.score.demands_failed = demands_failed;
                self.score.time_remaining = time_remaining.unwrap_or(-1.);
            }
            PacketC::SetIngame { state: _, lobby: _ } => {
                // TODO
            }
            PacketC::Error { message } => {
                warn!("server error: {message:?}")
            }
            _ => (),
        }
    }

    pub fn get_item(&mut self, location: ItemLocation) -> &mut Option<Item> {
        match location {
            ItemLocation::Tile(pos) => &mut self.tiles.get_mut(&pos).unwrap().item,
            ItemLocation::Player(pid) => &mut self.players.get_mut(&pid).unwrap().item,
        }
    }
    pub fn get_location_position(&self, location: ItemLocation) -> Vec2 {
        match location {
            ItemLocation::Tile(pos) => pos.as_vec2() + 0.5,
            ItemLocation::Player(p) => self.players[&p].movement.position,
        }
    }

    pub fn draw(&self, ctx: &mut SpriteRenderer) {
        ctx.set_view(
            -self.camera_center + (ctx.size / ctx.get_scale() / 2.),
            ctx.size.min_element() / 32. / 10.,
        );

        self.tilemap.draw(ctx);

        if let Some(me) = self.players.get(&self.my_id) {
            let t = me.movement.get_interact_target();
            ctx.draw_world(
                self.misc_textures
                    .interact_target
                    .at(t.as_vec2())
                    .tint(100, 100, 255),
            )
        }

        for p in self.players.values() {
            ctx.draw_world(self.misc_textures.player.at(p.movement.position));
            if let Some(item) = &p.item {
                item.draw(ctx, &self.item_sprites, &self.misc_textures)
            }
        }
        for tile in self.tiles.values() {
            if let Some(item) = &tile.item {
                item.draw(ctx, &self.item_sprites, &self.misc_textures)
            }
        }
        for item in &self.items_removed {
            item.draw(ctx, &self.item_sprites, &self.misc_textures)
        }
    }
}

impl Item {
    pub fn tick(&mut self, alive: f32, dt: f32) {
        self.position.exp_to(self.parent_position, dt * 20.);
        self.alive.exp_to(alive, dt * 20.)
    }
    pub fn draw(&self, ctx: &mut SpriteRenderer, item_sprites: &[Sprite], misc: &MiscTextures) {
        ctx.draw_world(
            item_sprites[self.kind.0]
                .at(self.position)
                .alpha(self.alive),
        );
        if let Some((progress, warn)) = self.progress {
            let (bg, fg) = if warn {
                ([100, 0, 0, 200], [255, 0, 0, 200])
            } else {
                ([0, 100, 0, 200], [0, 255, 0, 200])
            };
            ctx.draw_world(SpriteDraw::overlay(
                misc.solid,
                self.position + Vec2::new(-0.5, -1.3),
                Vec2::new(1., 0.2),
                Some(bg),
            ));
            ctx.draw_world(SpriteDraw::overlay(
                misc.solid,
                self.position + Vec2::new(-0.5, -1.3),
                Vec2::new(progress, 0.2),
                Some(fg),
            ))
        }
    }
}