greentic-flow-builder 0.1.0

//! Build the render context by merging data with theme tokens.

use crate::template::Theme;
use serde_json::{Map, Value};

pub fn build_context(data: &Value, theme: &Theme) -> Value {
    let mut ctx = match data {
        Value::Object(map) => map.clone(),
        _ => Map::new(),
    };

    let mut theme_obj = Map::new();
    let mut tokens = Map::new();
    for (key, value) in &theme.tokens {
        tokens.insert(key.clone(), value.clone());
    }
    theme_obj.insert("tokens".to_string(), Value::Object(tokens));
    theme_obj.insert("name".to_string(), Value::String(theme.name.clone()));
    ctx.insert("theme".to_string(), Value::Object(theme_obj));

    Value::Object(ctx)
}

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

    fn theme(tokens: &[(&str, Value)]) -> Theme {
        let mut map = BTreeMap::new();
        for (k, v) in tokens {
            map.insert(k.to_string(), v.clone());
        }
        Theme {
            name: "test".to_string(),
            display_name: "Test".to_string(),
            description: String::new(),
            tokens: map,
            host_config: Value::Null,
        }
    }

    #[test]
    fn test_context_has_data_fields() {
        let data = serde_json::json!({"title": "Hello"});
        let ctx = build_context(&data, &theme(&[]));
        assert_eq!(ctx["title"], "Hello");
    }

    #[test]
    fn test_context_has_theme_tokens() {
        let theme = theme(&[("color_primary", Value::from("#0d9488"))]);
        let ctx = build_context(&Value::Null, &theme);
        assert_eq!(ctx["theme"]["tokens"]["color_primary"], "#0d9488");
    }

    #[test]
    fn test_context_data_doesnt_clobber_theme() {
        let data = serde_json::json!({"theme": "SHOULD_BE_OVERWRITTEN"});
        let ctx = build_context(&data, &theme(&[]));
        assert!(ctx["theme"].is_object());
    }
}