1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use crate::resources::{market::Currency, quests::*};
use oxygengine_core::{
    prefab::{Prefab, PrefabComponent},
    Scalar,
};
use serde::{Deserialize, Serialize};
use std::collections::{HashMap, HashSet};

#[derive(Debug, Clone)]
pub enum PersonalQuestsError {
    QuestAlreadyTaken(QuestId),
    QuestAlreadyCompleted(QuestId),
    QuestDoesNotExists(QuestId),
    QuestHasNoObjectives(QuestId),
    ObjectiveDoesNotExists(ObjectiveId),
}

#[derive(Debug, Default, Clone, Serialize, Deserialize)]
pub struct PersonalQuests {
    /// {quest id: {objective id: progress score}}
    active_quests: HashMap<QuestId, HashMap<ObjectiveId, Scalar>>,
    completed_quests: HashSet<QuestId>,
}

impl PersonalQuests {
    pub fn take<Q, B, V>(
        &mut self,
        id: QuestId,
        database: &QuestsDatabase<Q, B, V>,
    ) -> Result<(), PersonalQuestsError>
    where
        Q: std::fmt::Debug + Clone + Send + Sync,
        B: std::fmt::Debug + Clone + Send + Sync,
        V: Currency + std::fmt::Debug + Clone + Send + Sync,
    {
        if self.active_quests.contains_key(&id) {
            return Err(PersonalQuestsError::QuestAlreadyTaken(id));
        }
        if self.completed_quests.contains(&id) {
            return Err(PersonalQuestsError::QuestAlreadyCompleted(id));
        }
        let quest = match database.quest(id) {
            Some(quest) => quest,
            None => return Err(PersonalQuestsError::QuestDoesNotExists(id)),
        };
        if quest.objectives.is_empty() {
            return Err(PersonalQuestsError::QuestHasNoObjectives(id));
        }
        let objectives = quest.objectives.iter().map(|id| (*id, 0.0)).collect();
        self.active_quests.insert(id, objectives);
        Ok(())
    }

    pub fn leave(&mut self, id: QuestId) -> Result<(), PersonalQuestsError> {
        if self.active_quests.remove(&id).is_some() {
            Ok(())
        } else {
            Err(PersonalQuestsError::QuestDoesNotExists(id))
        }
    }

    pub fn active_quests(&self) -> impl Iterator<Item = QuestId> + '_ {
        self.active_quests.keys().copied()
    }

    pub fn completed_quests(&self) -> impl Iterator<Item = QuestId> + '_ {
        self.completed_quests.iter().copied()
    }

    pub fn progress(&self, id: QuestId) -> Result<Scalar, PersonalQuestsError> {
        match self.active_quests.get(&id) {
            Some(objectives) => {
                Ok(objectives.values().fold(0.0, |a, v| a + *v) / objectives.len() as Scalar)
            }
            None => Err(PersonalQuestsError::QuestDoesNotExists(id)),
        }
    }

    pub fn progress_objectives(
        &self,
        id: QuestId,
    ) -> Result<impl Iterator<Item = (ObjectiveId, Scalar)> + '_, PersonalQuestsError> {
        match self.active_quests.get(&id) {
            Some(objectives) => Ok(objectives.iter().map(|(id, score)| (*id, *score))),
            None => Err(PersonalQuestsError::QuestDoesNotExists(id)),
        }
    }

    pub fn complete(
        &mut self,
        id: ObjectiveId,
        score: Option<Scalar>,
    ) -> Result<(), PersonalQuestsError> {
        for objectives in self.active_quests.values_mut() {
            if let Some(s) = objectives.get_mut(&id) {
                *s = (*s + score.unwrap_or(1.0)).max(0.0).min(1.0);
            }
        }
        let to_remove = self
            .active_quests
            .iter()
            .filter(|(_, objectives)| objectives.values().all(|score| *score >= 1.0))
            .map(|(id, _)| *id)
            .collect::<Vec<_>>();
        for id in to_remove {
            self.active_quests.remove(&id);
            self.completed_quests.insert(id);
        }
        Ok(())
    }

    pub fn reset(&mut self, id: QuestId) -> Result<(), PersonalQuestsError> {
        match self.active_quests.get_mut(&id) {
            Some(objectives) => {
                for score in objectives.values_mut() {
                    *score = 0.0;
                }
                Ok(())
            }
            None => Err(PersonalQuestsError::QuestDoesNotExists(id)),
        }
    }

    pub fn transfer(
        &mut self,
        receiver: &mut Self,
        id: QuestId,
    ) -> Result<(), PersonalQuestsError> {
        if receiver.active_quests.contains_key(&id) {
            return Err(PersonalQuestsError::QuestAlreadyTaken(id));
        }
        if receiver.completed_quests.contains(&id) {
            return Err(PersonalQuestsError::QuestAlreadyCompleted(id));
        }
        if !self.active_quests.contains_key(&id) {
            return Err(PersonalQuestsError::QuestDoesNotExists(id));
        }
        let objectives = self.active_quests.remove(&id).unwrap();
        receiver.active_quests.insert(id, objectives);
        Ok(())
    }
}

impl Prefab for PersonalQuests {}
impl PrefabComponent for PersonalQuests {}