eidetica 0.2.0

Decentralized DB. Remember Everything. Everywhere. All At Once.
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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280

//! Settings merge logic for combining user preferences.
//!
//! This module implements the "most aggressive" merge strategy for combining
//! sync settings from multiple users who are tracking the same database.

use crate::user::types::SyncSettings;

/// Merge multiple user sync settings into a single combined setting.
///
/// Uses the "most aggressive" strategy:
/// - `sync_enabled`: OR (true if any user wants sync)
/// - `sync_on_commit`: OR (true if any user wants it)
/// - `interval_seconds`: MIN (most frequent sync wins)
/// - `properties`: UNION (combine all properties, later values override)
///
/// # Arguments
/// * `settings` - Vector of sync settings from different users
///
/// # Returns
/// Combined sync settings, or a default if the input is empty
///
/// # Examples
/// ```
/// use eidetica::instance::settings_merge::merge_sync_settings;
/// use eidetica::user::types::SyncSettings;
///
/// let settings1 = SyncSettings {
///     sync_enabled: true,
///     sync_on_commit: false,
///     interval_seconds: Some(300),
///     properties: Default::default(),
/// };
///
/// let settings2 = SyncSettings {
///     sync_enabled: false,
///     sync_on_commit: true,
///     interval_seconds: Some(60),
///     properties: Default::default(),
/// };
///
/// let combined = merge_sync_settings(vec![settings1, settings2]);
///
/// // Most aggressive wins
/// assert_eq!(combined.sync_enabled, true);  // OR
/// assert_eq!(combined.sync_on_commit, true);  // OR
/// assert_eq!(combined.interval_seconds, Some(60));  // MIN
/// ```
pub fn merge_sync_settings(settings: Vec<SyncSettings>) -> SyncSettings {
    if settings.is_empty() {
        return SyncSettings::default();
    }

    // Start with the first setting as base
    let mut combined = settings[0].clone();

    // Merge with remaining settings
    for setting in settings.iter().skip(1) {
        // OR for boolean flags
        combined.sync_enabled = combined.sync_enabled || setting.sync_enabled;
        combined.sync_on_commit = combined.sync_on_commit || setting.sync_on_commit;

        // MIN for interval (most frequent sync)
        combined.interval_seconds = match (combined.interval_seconds, setting.interval_seconds) {
            (Some(a), Some(b)) => Some(a.min(b)),
            (Some(a), None) => Some(a),
            (None, Some(b)) => Some(b),
            (None, None) => None,
        };

        // UNION properties (later values override)
        for (key, value) in &setting.properties {
            combined.properties.insert(key.clone(), value.clone());
        }
    }

    combined
}

#[cfg(test)]
mod tests {
    use std::collections::HashMap;

    use super::*;

    #[test]
    fn test_merge_empty_settings() {
        let result = merge_sync_settings(vec![]);
        assert!(!result.sync_enabled);
        assert!(!result.sync_on_commit);
        assert_eq!(result.interval_seconds, None);
        assert!(result.properties.is_empty());
    }

    #[test]
    fn test_merge_single_setting() {
        let settings = SyncSettings {
            sync_enabled: true,
            sync_on_commit: true,
            interval_seconds: Some(60),
            properties: {
                let mut map = HashMap::new();
                map.insert("key1".to_string(), "value1".to_string());
                map
            },
        };

        let result = merge_sync_settings(vec![settings.clone()]);
        assert_eq!(result.sync_enabled, settings.sync_enabled);
        assert_eq!(result.sync_on_commit, settings.sync_on_commit);
        assert_eq!(result.interval_seconds, settings.interval_seconds);
        assert_eq!(result.properties.len(), 1);
    }

    #[test]
    fn test_merge_sync_enabled_or() {
        let settings1 = SyncSettings {
            sync_enabled: true,
            ..Default::default()
        };

        let settings2 = SyncSettings {
            sync_enabled: false,
            ..Default::default()
        };

        let result = merge_sync_settings(vec![settings1, settings2.clone()]);
        assert!(result.sync_enabled); // true OR false = true

        let result2 = merge_sync_settings(vec![settings2.clone(), settings2]);
        assert!(!result2.sync_enabled); // false OR false = false
    }

    #[test]
    fn test_merge_sync_on_commit_or() {
        let settings1 = SyncSettings {
            sync_on_commit: true,
            ..Default::default()
        };

        let settings2 = SyncSettings {
            sync_on_commit: false,
            ..Default::default()
        };

        let result = merge_sync_settings(vec![settings1, settings2]);
        assert!(result.sync_on_commit); // true OR false = true
    }

    #[test]
    fn test_merge_interval_min() {
        let settings1 = SyncSettings {
            interval_seconds: Some(300),
            ..Default::default()
        };

        let settings2 = SyncSettings {
            interval_seconds: Some(60),
            ..Default::default()
        };

        let settings3 = SyncSettings {
            interval_seconds: Some(120),
            ..Default::default()
        };

        let result = merge_sync_settings(vec![settings1, settings2, settings3]);
        assert_eq!(result.interval_seconds, Some(60)); // MIN(300, 60, 120) = 60
    }

    #[test]
    fn test_merge_interval_with_none() {
        let settings1 = SyncSettings {
            interval_seconds: Some(300),
            ..Default::default()
        };

        let settings2 = SyncSettings {
            interval_seconds: None,
            ..Default::default()
        };

        let result = merge_sync_settings(vec![settings1.clone(), settings2.clone()]);
        assert_eq!(result.interval_seconds, Some(300)); // Some takes precedence

        let result2 = merge_sync_settings(vec![settings2.clone(), settings1]);
        assert_eq!(result2.interval_seconds, Some(300));

        let result3 = merge_sync_settings(vec![settings2.clone(), settings2]);
        assert_eq!(result3.interval_seconds, None); // None + None = None
    }

    #[test]
    fn test_merge_properties_union() {
        let settings1 = SyncSettings {
            properties: {
                let mut map = HashMap::new();
                map.insert("key1".to_string(), "value1".to_string());
                map.insert("key2".to_string(), "value2".to_string());
                map
            },
            ..Default::default()
        };

        let settings2 = SyncSettings {
            properties: {
                let mut map = HashMap::new();
                map.insert("key2".to_string(), "value2_override".to_string());
                map.insert("key3".to_string(), "value3".to_string());
                map
            },
            ..Default::default()
        };

        let result = merge_sync_settings(vec![settings1, settings2]);

        assert_eq!(result.properties.len(), 3);
        assert_eq!(result.properties.get("key1"), Some(&"value1".to_string()));
        assert_eq!(
            result.properties.get("key2"),
            Some(&"value2_override".to_string())
        ); // Override
        assert_eq!(result.properties.get("key3"), Some(&"value3".to_string()));
    }

    #[test]
    fn test_merge_all_features() {
        let settings1 = SyncSettings {
            sync_enabled: true,
            sync_on_commit: false,
            interval_seconds: Some(300),
            properties: {
                let mut map = HashMap::new();
                map.insert("priority".to_string(), "low".to_string());
                map
            },
        };

        let settings2 = SyncSettings {
            sync_enabled: false,
            sync_on_commit: true,
            interval_seconds: Some(60),
            properties: {
                let mut map = HashMap::new();
                map.insert("priority".to_string(), "high".to_string());
                map.insert("transport".to_string(), "http".to_string());
                map
            },
        };

        let settings3 = SyncSettings {
            sync_enabled: false,
            sync_on_commit: false,
            interval_seconds: Some(120),
            properties: {
                let mut map = HashMap::new();
                map.insert("region".to_string(), "us-west".to_string());
                map
            },
        };

        let result = merge_sync_settings(vec![settings1, settings2, settings3]);

        // Most aggressive settings win
        assert!(result.sync_enabled); // true OR false OR false = true
        assert!(result.sync_on_commit); // false OR true OR false = true
        assert_eq!(result.interval_seconds, Some(60)); // MIN(300, 60, 120) = 60

        // Properties are unioned
        assert_eq!(result.properties.len(), 3);
        assert_eq!(result.properties.get("priority"), Some(&"high".to_string())); // Last override
        assert_eq!(
            result.properties.get("transport"),
            Some(&"http".to_string())
        );
        assert_eq!(
            result.properties.get("region"),
            Some(&"us-west".to_string())
        );
    }
}