opencode-provider-manager 0.1.7-beta.4

//! Configuration file management for oh-my-openagent.
//!
//! Handles reading, writing, and path resolution for agent config files.
//!
//! Config file locations (matching oh-my-openagent conventions):
//! - Project: `.opencode/oh-my-opencode.json[c]` or `.opencode/oh-my-openagent.json[c]`
//! - Global:  `~/.config/opencode/oh-my-opencode.json[c]` (XDG) or `%APPDATA%\opencode\oh-my-opencode.json[c]` (Windows)

use crate::omo_config::error::{AgentConfigError, Result};
use crate::omo_config::types::OhMyOpencodeConfig;
use std::path::{Path, PathBuf};

/// Which configuration layer to operate on.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum ConfigLayer {
    /// Global config: `~/.config/opencode/oh-my-opencode.json`
    Global,
    /// Project config: `.opencode/oh-my-opencode.json`
    Project,
}

/// Manages agent configuration files.
#[derive(Debug, Clone, PartialEq)]
pub struct AgentConfigManager {
    /// Global config file path.
    pub global_path: PathBuf,
    /// Project config file path.
    pub project_path: Option<PathBuf>,
    /// Cached global config.
    pub global_config: Option<OhMyOpencodeConfig>,
    /// Cached project config.
    pub project_config: Option<OhMyOpencodeConfig>,
}

impl AgentConfigManager {
    /// Create a new manager with default paths.
    pub fn new() -> Result<Self> {
        let global_path = default_global_path()?;
        let project_path = find_project_path();

        Ok(Self {
            global_path,
            project_path,
            global_config: None,
            project_config: None,
        })
    }

    /// Load all configs (global + project).
    pub fn load_all(
        &mut self,
    ) -> Result<(&Option<OhMyOpencodeConfig>, &Option<OhMyOpencodeConfig>)> {
        self.global_config = self.load_layer(ConfigLayer::Global)?;
        self.project_config = self.load_layer(ConfigLayer::Project)?;
        Ok((&self.global_config, &self.project_config))
    }

    /// Load a single config layer.
    pub fn load_layer(&self, layer: ConfigLayer) -> Result<Option<OhMyOpencodeConfig>> {
        let path = match layer {
            ConfigLayer::Global => &self.global_path,
            ConfigLayer::Project => {
                let Some(ref path) = self.project_path else {
                    return Ok(None);
                };
                path
            }
        };

        if !path.exists() {
            return Ok(None);
        }

        let content = std::fs::read_to_string(path).map_err(|e| AgentConfigError::ReadError {
            path: path.clone(),
            source: e,
        })?;

        let config = parse_config_content(&content, path)?;
        Ok(Some(config))
    }

    /// Save a config layer to disk.
    pub fn save(&self, layer: ConfigLayer, config: &OhMyOpencodeConfig) -> Result<()> {
        let path = match layer {
            ConfigLayer::Global => &self.global_path,
            ConfigLayer::Project => {
                let Some(ref path) = self.project_path else {
                    return Err(AgentConfigError::InvalidLayer("project".to_string()));
                };
                path
            }
        };

        // Ensure parent directory exists
        if let Some(parent) = path.parent() {
            std::fs::create_dir_all(parent)?;
        }

        let json =
            serde_json::to_string_pretty(config).map_err(AgentConfigError::SerializeError)?;

        std::fs::write(path, json).map_err(|e| AgentConfigError::WriteError {
            path: path.clone(),
            source: e,
        })?;

        Ok(())
    }

    /// Get the path for a specific layer.
    pub fn path_for(&self, layer: ConfigLayer) -> &Path {
        match layer {
            ConfigLayer::Global => &self.global_path,
            ConfigLayer::Project => self
                .project_path
                .as_deref()
                .unwrap_or_else(|| Path::new(".opencode/oh-my-opencode.json")),
        }
    }
}

impl Default for AgentConfigManager {
    fn default() -> Self {
        Self::new().unwrap_or_else(|_| Self {
            global_path: default_global_path_fallback(),
            project_path: None,
            global_config: None,
            project_config: None,
        })
    }
}

/// Parse config content from various formats (JSON / JSONC / TOML / YAML).
fn parse_config_content(content: &str, path: &Path) -> Result<OhMyOpencodeConfig> {
    let ext = path
        .extension()
        .and_then(|e| e.to_str())
        .unwrap_or("")
        .to_lowercase();

    match ext.as_str() {
        "jsonc" => parse_jsonc(content, path),
        "json" | "" => {
            // Try JSONC first (handles comments if present), fall back to plain JSON
            if content.contains("//") || content.contains("/*") {
                parse_jsonc(content, path)
            } else {
                serde_json::from_str(content).map_err(|e| AgentConfigError::JsonParseError {
                    path: path.to_path_buf(),
                    source: e,
                })
            }
        }
        "toml" => toml::from_str(content).map_err(|e| AgentConfigError::TomlParseError {
            path: path.to_path_buf(),
            source: Box::new(e),
        }),
        "yaml" | "yml" => {
            serde_yaml::from_str(content).map_err(|e| AgentConfigError::YamlParseError {
                path: path.to_path_buf(),
                source: Box::new(e),
            })
        }
        other => Err(AgentConfigError::UnsupportedFormat {
            format: other.to_string(),
            path: path.to_path_buf(),
        }),
    }
}

/// Parse JSONC content using jsonc-parser crate.
fn parse_jsonc(content: &str, path: &Path) -> Result<OhMyOpencodeConfig> {
    let parsed = jsonc_parser::parse_to_value(content, &Default::default())
        .map_err(|e| AgentConfigError::Other(format!("JSONC parse error: {}", e)))?;

    let Some(value) = parsed else {
        return Err(AgentConfigError::Other(
            "JSONC parse returned None".to_string(),
        ));
    };

    let serde_value = jsonc_to_serde(value);
    serde_json::from_value(serde_value).map_err(|e| AgentConfigError::JsonParseError {
        path: path.to_path_buf(),
        source: e,
    })
}

/// Convert jsonc_parser::JsonValue to serde_json::Value.
fn jsonc_to_serde(value: jsonc_parser::JsonValue) -> serde_json::Value {
    match value {
        jsonc_parser::JsonValue::String(s) => serde_json::Value::String(s.into_owned()),
        jsonc_parser::JsonValue::Number(n) => {
            serde_json::Value::Number(n.parse().unwrap_or_else(|_| serde_json::Number::from(0)))
        }
        jsonc_parser::JsonValue::Boolean(b) => serde_json::Value::Bool(b),
        jsonc_parser::JsonValue::Object(obj) => {
            let map = obj
                .take_inner()
                .into_iter()
                .map(|(k, v)| (k, jsonc_to_serde(v)))
                .collect();
            serde_json::Value::Object(map)
        }
        jsonc_parser::JsonValue::Array(arr) => {
            serde_json::Value::Array(arr.take_inner().into_iter().map(jsonc_to_serde).collect())
        }
        jsonc_parser::JsonValue::Null => serde_json::Value::Null,
    }
}

/// Default global config path: `~/.config/opencode/oh-my-opencode.json`.
/// Prefers `.jsonc` if it exists.
///
/// Checks both platform config dir (e.g., `%APPDATA%\opencode` on Windows)
/// and `~/.config/opencode` (Unix-style, also used by oh-my-opencode on Windows).
fn default_global_path() -> Result<PathBuf> {
    let mut bases = Vec::new();

    // Platform config dir (e.g., %APPDATA%/opencode on Windows, ~/.config on Linux)
    if let Some(config_dir) = dirs::config_dir() {
        bases.push(config_dir.join("opencode"));
    }

    // Unix-style ~/.config/opencode (also used by oh-my-opencode on Windows)
    if let Some(home_dir) = dirs::home_dir() {
        let unix_style = home_dir.join(".config").join("opencode");
        if !bases.contains(&unix_style) {
            bases.push(unix_style);
        }
    }

    if bases.is_empty() {
        return Err(AgentConfigError::Other(
            "Could not determine config directory".to_string(),
        ));
    }

    // Prefer .jsonc, then .json; prefer oh-my-opencode, then oh-my-openagent
    for base in &bases {
        for filename in [
            "oh-my-opencode.jsonc",
            "oh-my-opencode.json",
            "oh-my-openagent.jsonc",
            "oh-my-openagent.json",
        ] {
            let path = base.join(filename);
            if path.exists() {
                return Ok(path);
            }
        }
    }

    // Default to oh-my-opencode.jsonc in the first available directory
    Ok(bases[0].join("oh-my-opencode.jsonc"))
}

/// Fallback global path for Default impl when dirs::config_dir() fails.
fn default_global_path_fallback() -> PathBuf {
    PathBuf::from("~/.config/opencode/oh-my-opencode.jsonc")
}

/// Find the project config by walking up from the current directory.
/// Looks in `.opencode/` for `oh-my-opencode.json[c]` or `oh-my-openagent.json[c]`.
fn find_project_path() -> Option<PathBuf> {
    let mut current = std::env::current_dir().ok()?;

    loop {
        let opencode_dir = current.join(".opencode");

        // Check .opencode/ directory first
        if opencode_dir.is_dir() {
            for filename in [
                "oh-my-opencode.jsonc",
                "oh-my-opencode.json",
                "oh-my-openagent.jsonc",
                "oh-my-openagent.json",
            ] {
                let path = opencode_dir.join(filename);
                if path.exists() {
                    return Some(path);
                }
            }
        }

        // Also check root-level fallback (legacy location)
        for filename in [
            "oh-my-opencode.jsonc",
            "oh-my-opencode.json",
            "oh-my-openagent.jsonc",
            "oh-my-openagent.json",
        ] {
            let path = current.join(filename);
            if path.exists() {
                return Some(path);
            }
        }

        // Stop at git root
        if current.join(".git").exists() {
            return None;
        }

        match current.parent() {
            Some(parent) => current = parent.to_path_buf(),
            None => return None,
        }
    }
}

/// Parse a config file directly from a path.
pub fn parse_config_file(path: &Path) -> Result<OhMyOpencodeConfig> {
    if !path.exists() {
        return Err(AgentConfigError::NotFound(path.to_path_buf()));
    }

    let content = std::fs::read_to_string(path).map_err(|e| AgentConfigError::ReadError {
        path: path.to_path_buf(),
        source: e,
    })?;

    parse_config_content(&content, path)
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::io::Write;
    use tempfile::NamedTempFile;

    #[test]
    fn test_parse_json_config() {
        let json = r#"{
            "$schema": "https://example.com/schema.json",
            "newTaskSystemEnabled": true,
            "defaultRunAgent": "build",
            "agents": {
                "build": {
                    "model": "anthropic/claude-sonnet-4-5",
                    "temperature": 0.7
                }
            }
        }"#;

        let mut file = NamedTempFile::with_suffix(".json").unwrap();
        file.write_all(json.as_bytes()).unwrap();

        let config = parse_config_file(file.path()).unwrap();
        assert_eq!(config.new_task_system_enabled, Some(true));
        assert_eq!(config.default_run_agent.as_deref(), Some("build"));
        assert!(config.agents.is_some());
    }

    #[test]
    fn test_parse_jsonc_with_comments() {
        let jsonc = r#"{
            // This is a comment
            "$schema": "https://example.com/schema.json",
            /* multi-line
               comment */
            "newTaskSystemEnabled": true
        }"#;

        let mut file = NamedTempFile::with_suffix(".jsonc").unwrap();
        file.write_all(jsonc.as_bytes()).unwrap();

        let config = parse_config_file(file.path()).unwrap();
        assert_eq!(config.new_task_system_enabled, Some(true));
    }

    #[test]
    fn test_parse_jsonc_with_trailing_commas() {
        let jsonc = r#"{
            "newTaskSystemEnabled": true,
            "defaultRunAgent": "build",
        }"#;

        let mut file = NamedTempFile::with_suffix(".jsonc").unwrap();
        file.write_all(jsonc.as_bytes()).unwrap();

        let config = parse_config_file(file.path()).unwrap();
        assert_eq!(config.new_task_system_enabled, Some(true));
    }

    #[test]
    fn test_parse_toml_config() {
        let toml = r#"
newTaskSystemEnabled = true
defaultRunAgent = "plan"

[agents.build]
model = "openai/gpt-4o"
temperature = 0.5
"#;

        let mut file = NamedTempFile::with_suffix(".toml").unwrap();
        file.write_all(toml.as_bytes()).unwrap();

        let config = parse_config_file(file.path()).unwrap();
        assert_eq!(config.default_run_agent.as_deref(), Some("plan"));
        let agents = config.agents.unwrap();
        assert!(agents.build.is_some());
    }

    #[test]
    fn test_agent_config_manager_new() {
        let manager = AgentConfigManager::new();
        assert!(manager.is_ok());
    }
}