use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StateDiff {
    changes: Vec<Change>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Change {
    pub path: String,
    pub kind: String,
}

impl StateDiff {
    pub fn new() -> Self {
        StateDiff { changes: Vec::new() }
    }

    pub fn add_change(&mut self, path: String, kind: String) {
        self.changes.push(Change { path, kind });
    }

    pub fn is_empty(&self) -> bool {
        self.changes.is_empty()
    }

    pub fn clear(&mut self) {
        self.changes.clear();
    }
}

pub fn compute_diff(before: &serde_json::Value, after: &serde_json::Value) -> Vec<Change> {
    if before == after {
        return Vec::new();
    }
    vec![Change {
        path: ".".to_string(),
        kind: "modified".to_string(),
    }]
}