aves-corv 0.5.0

Specialized discussion domain for the Aves async application runtime
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use super::plugins::ConfigSettings;
use super::types::{DiscussConfigOption, DiscussError};

/// Serialize provider-refreshed config options into the persisted JSON blob for
/// a load refresh (R3), returning `None` when the provider response carried no
/// options so the merge-safe refresh preserves cached options instead of
/// clearing them.
pub(super) fn provider_config_options_json(
    config_options: &Option<Vec<DiscussConfigOption>>,
) -> Result<Option<String>, DiscussError> {
    match config_options {
        Some(options) => Ok(Some(serde_json::to_string(options)?)),
        None => Ok(None),
    }
}

pub(super) fn config_options_from_json(json: &str) -> Result<Vec<DiscussConfigOption>, DiscussError> {
    serde_json::from_str(json).map_err(DiscussError::from)
}

pub(super) fn config_settings_from_json(json: &str) -> Result<ConfigSettings, DiscussError> {
    serde_json::from_str(json).map_err(DiscussError::from)
}

pub(super) fn config_settings_from_value(value: &serde_json::Value) -> ConfigSettings {
    value
        .as_object()
        .into_iter()
        .flatten()
        .filter_map(|(id, value)| value.as_str().map(|value| (id.clone(), value.to_string())))
        .collect()
}

pub(super) fn merged_config_preferences(
    agent_defaults: &ConfigSettings,
    session_settings: &ConfigSettings,
) -> ConfigSettings {
    let mut preferences = agent_defaults.clone();
    preferences.extend(
        session_settings
            .iter()
            .map(|(config_id, value)| (config_id.clone(), value.clone())),
    );
    preferences
}

pub(super) fn assigned_agent_mode_selection(
    provider_options: &[DiscussConfigOption],
    assigned_agent_id: &str,
) -> Option<ConfigPreferenceSelection> {
    provider_options
        .iter()
        .filter(|option| option.category == "mode")
        .find_map(|option| {
            option
                .options
                .iter()
                .find(|candidate| candidate.value == assigned_agent_id)
                .map(|candidate| ConfigPreferenceSelection {
                    config_id: option.id.clone(),
                    value: candidate.value.clone(),
                })
        })
}

pub(super) fn without_mode_preferences(
    preferences: &ConfigSettings,
    provider_options: &[DiscussConfigOption],
    selected_mode_config_id: &str,
) -> ConfigSettings {
    let mut non_mode = preferences.clone();
    non_mode.remove(selected_mode_config_id);
    for option in provider_options
        .iter()
        .filter(|option| option.category == "mode")
    {
        non_mode.remove(&option.id);
    }
    non_mode
}

#[derive(Debug, PartialEq, Eq)]
pub(super) struct ConfigPreferenceSelection {
    pub(super) config_id: String,
    pub(super) value: String,
}

pub(super) struct ConfigPreferenceReconciler<'a> {
    preferences: &'a ConfigSettings,
    provider_options: Vec<DiscussConfigOption>,
    attempted: std::collections::HashSet<String>,
}

impl<'a> ConfigPreferenceReconciler<'a> {
    pub(super) fn new(preferences: &'a ConfigSettings, provider_options: Vec<DiscussConfigOption>) -> Self {
        Self {
            preferences,
            provider_options,
            attempted: std::collections::HashSet::new(),
        }
    }

    pub(super) fn next(&mut self) -> Option<ConfigPreferenceSelection> {
        let selection = next_config_preference(self.preferences, &self.provider_options, &self.attempted)?;
        self.attempted.insert(selection.config_id.clone());
        Some(selection)
    }

    pub(super) fn adopt_provider_options(&mut self, provider_options: Vec<DiscussConfigOption>) {
        self.provider_options = provider_options;
    }

    pub(super) fn finish(self) -> Vec<DiscussConfigOption> {
        self.provider_options
    }
}

pub(super) fn next_config_preference(
    preferences: &ConfigSettings,
    provider_options: &[DiscussConfigOption],
    attempted: &std::collections::HashSet<String>,
) -> Option<ConfigPreferenceSelection> {
    provider_options.iter().find_map(|option| {
        if attempted.contains(&option.id) {
            return None;
        }
        let value = preferences.get(&option.id)?;
        if option.value == *value {
            return None;
        }
        config_option_supports_value(option, value).then(|| ConfigPreferenceSelection {
            config_id: option.id.clone(),
            value: value.clone(),
        })
    })
}

fn config_option_supports_value(option: &DiscussConfigOption, requested: &str) -> bool {
    option.options.iter().any(|entry| entry.value == requested)
}