issun 0.10.0

A mini game engine for logic-focused games - Build games in ISSUN (一寸) of time
Documentation 
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163

//! Pure logic service for logistics calculations

use super::types::*;
use crate::plugin::inventory::InventoryState;
use crate::service::Service;
use async_trait::async_trait;
use std::any::Any;

/// Pure logistics calculation service
#[derive(Clone, Default)]
pub struct LogisticsService;

#[async_trait]
impl Service for LogisticsService {
    fn name(&self) -> &'static str {
        "issun:logistics_service"
    }

    fn clone_box(&self) -> Box<dyn Service> {
        Box::new(self.clone())
    }

    fn as_any(&self) -> &dyn Any {
        self
    }

    fn as_any_mut(&mut self) -> &mut dyn Any {
        self
    }
}

impl LogisticsService {
    /// Calculate transfer amount based on availability and capacity
    pub fn calculate_transfer_amount(
        throughput: u32,
        available: u32,
        capacity: u32,
        global_multiplier: f32,
    ) -> u32 {
        let effective_throughput = (throughput as f32 * global_multiplier) as u32;
        effective_throughput.min(available).min(capacity)
    }

    /// Check if item passes filter
    pub fn passes_filter(item_id: &ItemId, filter: &Option<Vec<ItemId>>) -> bool {
        match filter {
            None => true, // No filter = accept all
            Some(allowed) => allowed.contains(item_id),
        }
    }

    /// Determine next status based on transfer result
    pub fn determine_status(transferred: u32, available: u32, capacity: u32) -> TransporterStatus {
        if transferred > 0 {
            TransporterStatus::Active
        } else if available == 0 {
            TransporterStatus::SourceEmpty
        } else if capacity == 0 {
            TransporterStatus::DestinationFull
        } else {
            TransporterStatus::Blocked
        }
    }

    /// Find transferable items from source inventory
    pub fn find_transferable_items(
        inventory_state: &InventoryState,
        source_id: &InventoryEntityId,
        filter: &Option<Vec<ItemId>>,
    ) -> Vec<(ItemId, u32)> {
        if let Some(inv) = inventory_state.get_inventory(source_id) {
            inv.iter()
                .filter(|(item_id, _)| Self::passes_filter(item_id, filter))
                .map(|(item_id, &amount)| (item_id.clone(), amount))
                .collect()
        } else {
            Vec::new()
        }
    }

    /// Calculate base transport cost (simple formula)
    pub fn calculate_base_cost(amount: u32, distance: f32) -> f32 {
        amount as f32 * distance * 0.1
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_calculate_transfer_amount() {
        // Normal case
        assert_eq!(
            LogisticsService::calculate_transfer_amount(10, 100, 100, 1.0),
            10
        );

        // Limited by available
        assert_eq!(
            LogisticsService::calculate_transfer_amount(10, 5, 100, 1.0),
            5
        );

        // Limited by capacity
        assert_eq!(
            LogisticsService::calculate_transfer_amount(10, 100, 3, 1.0),
            3
        );

        // With multiplier
        assert_eq!(
            LogisticsService::calculate_transfer_amount(10, 100, 100, 2.0),
            20
        );
    }

    #[test]
    fn test_passes_filter() {
        // No filter
        assert!(LogisticsService::passes_filter(&"iron".into(), &None));

        // With filter - passes
        let filter = Some(vec!["iron".into(), "gold".into()]);
        assert!(LogisticsService::passes_filter(&"iron".into(), &filter));

        // With filter - fails
        assert!(!LogisticsService::passes_filter(&"copper".into(), &filter));
    }

    #[test]
    fn test_determine_status() {
        // Active
        assert_eq!(
            LogisticsService::determine_status(10, 100, 100),
            TransporterStatus::Active
        );

        // Source empty
        assert_eq!(
            LogisticsService::determine_status(0, 0, 100),
            TransporterStatus::SourceEmpty
        );

        // Destination full
        assert_eq!(
            LogisticsService::determine_status(0, 100, 0),
            TransporterStatus::DestinationFull
        );

        // Blocked
        assert_eq!(
            LogisticsService::determine_status(0, 100, 100),
            TransporterStatus::Blocked
        );
    }

    #[test]
    fn test_calculate_base_cost() {
        assert_eq!(LogisticsService::calculate_base_cost(10, 5.0), 5.0);
        assert_eq!(LogisticsService::calculate_base_cost(100, 1.0), 10.0);
    }
}