/*
    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::{
    pathfinding::{find_path, Path},
    BotAlgo, BotInput,
};
use hurrycurry_client_lib::Game;
use hurrycurry_protocol::{glam::IVec2, DemandIndex, Message, PacketS, PlayerID, Score};
use log::info;
use rand::{random, seq::IndexedRandom, thread_rng};

#[derive(Debug, Clone, Default)]
pub enum Customer {
    #[default]
    New,
    Entering {
        path: Path,
        chair: IVec2,
        origin: IVec2,
        ticks: usize,
    },
    Waiting {
        demand: DemandIndex,
        chair: IVec2,
        timeout: f32,
        origin: IVec2,
    },
    Eating {
        demand: DemandIndex,
        target: IVec2,
        progress: f32,
        chair: IVec2,
        origin: IVec2,
    },
    Finishing {
        target: IVec2,
        origin: IVec2,
        cooldown: f32,
    },
    Exiting {
        path: Path,
    },
}

impl BotAlgo for Customer {
    fn tick(&mut self, me: PlayerID, game: &Game, dt: f32) -> BotInput {
        let Some(playerdata) = game.players.get(&me) else {
            return BotInput::default();
        };
        let pos = playerdata.movement.position;
        match self {
            Customer::New => {
                if let Some(&chair) = game
                    .tiles
                    .iter()
                    .filter(|(_, t)| game.data.tile_name(t.kind) == "chair")
                    .map(|(p, _)| *p)
                    .collect::<Vec<_>>()
                    .choose(&mut thread_rng())
                {
                    if let Some(path) = find_path(&game.walkable, pos.as_ivec2(), chair) {
                        info!("{me:?} -> entering");
                        *self = Customer::Entering {
                            path,
                            chair,
                            origin: pos.as_ivec2(),
                            ticks: 0,
                        };
                    }
                }
                BotInput::default()
            }
            Customer::Entering {
                path,
                chair,
                origin,
                ticks,
            } => {
                *ticks += 1;
                let check = *ticks % 10 == 0;
                if path.is_done() {
                    let demand = DemandIndex(random::<u32>() as usize % game.data.demands.len());
                    info!("{me:?} -> waiting");
                    let timeout = 90. + random::<f32>() * 60.;
                    *self = Customer::Waiting {
                        chair: *chair,
                        timeout,
                        demand,
                        origin: *origin,
                    };
                    BotInput {
                        extra: vec![PacketS::Communicate {
                            message: Some(Message::Item(game.data.demands[demand.0].input)),
                            timeout: Some(timeout),
                            player: me,
                        }],
                        ..Default::default()
                    }
                } else if check
                    && path.remaining_segments() < 5
                    && game
                        .players
                        .iter()
                        .find(|(id, p)| {
                            p.character < 0
                                && **id != me
                                && p.movement.position.distance(chair.as_vec2() + 0.5) < 1.
                        })
                        .is_some()
                {
                    *self = Customer::New;
                    BotInput::default()
                } else if path.is_stuck() {
                    if let Some(path) = find_path(&game.walkable, pos.as_ivec2(), *origin) {
                        *self = Customer::Exiting { path };
                    }
                    BotInput::default()
                } else {
                    BotInput {
                        direction: path.next_direction(pos, dt) * 0.6,
                        ..Default::default()
                    }
                }
            }
            Customer::Waiting {
                chair,
                demand,
                timeout,
                origin,
            } => {
                *timeout -= dt;
                if *timeout <= 0. {
                    let path = find_path(&game.walkable, pos.as_ivec2(), *origin)
                        .expect("no path to exit");
                    info!("{me:?} -> exiting");
                    *self = Customer::Exiting { path };
                    BotInput {
                        extra: vec![
                            PacketS::Communicate {
                                message: None,
                                timeout: Some(0.),
                                player: me,
                            },
                            PacketS::ApplyScore(Score {
                                points: -1,
                                demands_failed: 1,
                                ..Default::default()
                            }),
                            PacketS::Effect {
                                name: "angry".to_string(),
                                player: me,
                            },
                        ],
                        ..Default::default()
                    }
                } else {
                    let demand_data = &game.data.demands[demand.0];
                    let demand_pos = [IVec2::NEG_X, IVec2::NEG_Y, IVec2::X, IVec2::Y]
                        .into_iter()
                        .find_map(|off| {
                            let pos = *chair + off;
                            if game
                                .tiles
                                .get(&pos)
                                .map(|t| {
                                    t.item
                                        .as_ref()
                                        .map(|i| i.kind == demand_data.input)
                                        .unwrap_or_default()
                                })
                                .unwrap_or_default()
                            {
                                Some(pos)
                            } else {
                                None
                            }
                        });
                    if let Some(pos) = demand_pos {
                        info!("{me:?} -> eating");
                        *self = Customer::Eating {
                            demand: *demand,
                            target: pos,
                            progress: 0.,
                            chair: *chair,
                            origin: *origin,
                        };
                        BotInput {
                            extra: vec![
                                PacketS::Communicate {
                                    message: None,
                                    timeout: Some(0.),
                                    player: me,
                                },
                                PacketS::Effect {
                                    name: "satisfied".to_string(),
                                    player: me,
                                },
                                PacketS::Interact {
                                    pos: Some(pos),
                                    player: me,
                                },
                                PacketS::Interact {
                                    pos: None,
                                    player: me,
                                },
                            ],
                            ..Default::default()
                        }
                    } else {
                        BotInput {
                            direction: (chair.as_vec2() + 0.5) - pos,
                            ..Default::default()
                        }
                    }
                }
            }
            Customer::Eating {
                demand,
                target,
                progress,
                chair,
                origin,
            } => {
                let demand = &game.data.demands[demand.0];
                *progress += dt / demand.duration;
                if *progress >= 1. {
                    let mut packets = Vec::new();
                    packets.push(PacketS::ReplaceHand {
                        player: me,
                        item: demand.output,
                    });
                    packets.push(PacketS::ApplyScore(Score {
                        demands_completed: 1,
                        points: demand.points,
                        ..Default::default()
                    }));
                    info!("{me:?} -> finishing");
                    *self = Customer::Finishing {
                        target: *target,
                        origin: *origin,
                        cooldown: 0.5,
                    };
                    return BotInput {
                        extra: packets,
                        ..Default::default()
                    };
                }
                BotInput {
                    direction: (chair.as_vec2() + 0.5) - pos,
                    ..Default::default()
                }
            }
            Customer::Finishing {
                target,
                origin,
                cooldown,
            } => {
                *cooldown -= dt;
                if game.players.get(&me).map_or(false, |pl| pl.item.is_none()) {
                    if let Some(path) = find_path(&game.walkable, pos.as_ivec2(), *origin) {
                        *self = Customer::Exiting { path };
                    }
                    BotInput::default()
                } else {
                    let direction = (target.as_vec2() + 0.5) - pos;
                    if *cooldown < 0. {
                        *cooldown += 1.;
                        BotInput {
                            extra: vec![
                                PacketS::Interact {
                                    player: me,
                                    pos: Some(*target),
                                },
                                PacketS::Interact {
                                    player: me,
                                    pos: None,
                                },
                            ],
                            direction,
                            ..Default::default()
                        }
                    } else {
                        BotInput {
                            direction,
                            ..Default::default()
                        }
                    }
                }
            }
            Customer::Exiting { path } => {
                if path.is_done() || path.is_stuck() {
                    info!("{me:?} -> leave");
                    BotInput {
                        leave: true,
                        ..Default::default()
                    }
                } else {
                    BotInput {
                        direction: path.next_direction(pos, dt) * 0.6,
                        ..Default::default()
                    }
                }
            }
        }
    }
}