//! Plugin system for extending CLI functionality
//!
//! Allows users to create and register custom plugins for custom commands and behaviors.

#![allow(dead_code)]

use anyhow::{anyhow, Result};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::process::Command;

/// Plugin manifest
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PluginManifest {
    /// Plugin name
    pub name: String,
    /// Plugin version
    pub version: String,
    /// Plugin description
    pub description: String,
    /// Author name
    pub author: String,
    /// Plugin entry point (binary or script)
    pub entry_point: String,
    /// Supported commands
    pub commands: Vec<PluginCommand>,
    /// Plugin dependencies
    #[serde(default)]
    pub dependencies: Vec<String>,
    /// Whether plugin requires elevated privileges
    #[serde(default)]
    pub requires_admin: bool,
    /// Minimum CLI version required
    #[serde(default)]
    pub min_cli_version: String,
}

/// Plugin command definition
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PluginCommand {
    /// Command name
    pub name: String,
    /// Command description
    pub description: String,
    /// Command arguments
    #[serde(default)]
    pub args: Vec<CommandArg>,
    /// Command options/flags
    #[serde(default)]
    pub options: Vec<CommandOption>,
}

/// Command argument
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CommandArg {
    /// Argument name
    pub name: String,
    /// Argument description
    pub description: String,
    /// Whether argument is optional
    #[serde(default)]
    pub optional: bool,
}

/// Command option/flag
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CommandOption {
    /// Option long name
    pub long: String,
    /// Option short name
    #[serde(default)]
    pub short: Option<String>,
    /// Option description
    pub description: String,
    /// Whether option takes a value
    #[serde(default)]
    pub takes_value: bool,
}

/// Plugin metadata
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PluginInfo {
    /// Plugin name
    pub name: String,
    /// Plugin version
    pub version: String,
    /// Installation path
    pub path: PathBuf,
    /// Whether plugin is enabled
    pub enabled: bool,
    /// Installation date
    pub installed_at: String,
    /// Last updated date
    pub updated_at: String,
}

/// Plugin registry
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct PluginRegistry {
    /// Installed plugins
    plugins: HashMap<String, PluginInfo>,
}

impl PluginRegistry {
    /// Create new plugin registry
    pub fn new() -> Self {
        Self::default()
    }

    /// Load registry from file
    pub fn from_file(path: impl AsRef<Path>) -> Result<Self> {
        let content = std::fs::read_to_string(path)?;
        let registry = serde_json::from_str(&content)?;
        Ok(registry)
    }

    /// Save registry to file
    pub fn save(&self, path: impl AsRef<Path>) -> Result<()> {
        let content = serde_json::to_string_pretty(self)?;
        std::fs::write(path, content)?;
        Ok(())
    }

    /// Register a plugin
    pub fn register(&mut self, plugin: PluginInfo) {
        self.plugins.insert(plugin.name.clone(), plugin);
    }

    /// Unregister a plugin
    pub fn unregister(&mut self, name: &str) -> Result<()> {
        self.plugins
            .remove(name)
            .ok_or_else(|| anyhow!("Plugin not found: {}", name))?;
        Ok(())
    }

    /// Get plugin info
    pub fn get(&self, name: &str) -> Option<&PluginInfo> {
        self.plugins.get(name)
    }

    /// List all plugins
    pub fn list(&self) -> Vec<&PluginInfo> {
        self.plugins.values().collect()
    }

    /// List enabled plugins
    pub fn list_enabled(&self) -> Vec<&PluginInfo> {
        self.plugins.values().filter(|p| p.enabled).collect()
    }

    /// Enable plugin
    pub fn enable(&mut self, name: &str) -> Result<()> {
        if let Some(plugin) = self.plugins.get_mut(name) {
            plugin.enabled = true;
            Ok(())
        } else {
            Err(anyhow!("Plugin not found: {}", name))
        }
    }

    /// Disable plugin
    pub fn disable(&mut self, name: &str) -> Result<()> {
        if let Some(plugin) = self.plugins.get_mut(name) {
            plugin.enabled = false;
            Ok(())
        } else {
            Err(anyhow!("Plugin not found: {}", name))
        }
    }

    /// Count plugins
    pub fn count(&self) -> usize {
        self.plugins.len()
    }

    /// Count enabled plugins
    pub fn count_enabled(&self) -> usize {
        self.plugins.values().filter(|p| p.enabled).count()
    }
}

/// Plugin manager
pub struct PluginManager;

impl PluginManager {
    /// Install plugin from file
    pub fn install(
        manifest_path: impl AsRef<Path>,
        install_dir: impl AsRef<Path>,
    ) -> Result<PluginInfo> {
        let content = std::fs::read_to_string(&manifest_path)?;
        let manifest: PluginManifest = toml::from_str(&content)?;

        let install_path = install_dir.as_ref().join(&manifest.name);
        std::fs::create_dir_all(&install_path)?;

        let info = PluginInfo {
            name: manifest.name,
            version: manifest.version,
            path: install_path,
            enabled: true,
            installed_at: chrono::Local::now().to_rfc3339(),
            updated_at: chrono::Local::now().to_rfc3339(),
        };

        Ok(info)
    }

    /// Uninstall plugin
    pub fn uninstall(plugin_path: impl AsRef<Path>) -> Result<()> {
        std::fs::remove_dir_all(plugin_path)?;
        Ok(())
    }

    /// Execute plugin command
    pub fn execute(plugin: &PluginInfo, command: &str, args: &[&str]) -> Result<String> {
        let output = Command::new("sh")
            .arg("-c")
            .arg(format!(
                "{} {} {}",
                plugin.path.display(),
                command,
                args.join(" ")
            ))
            .output()?;

        if !output.status.success() {
            let stderr = String::from_utf8_lossy(&output.stderr);
            return Err(anyhow!("Plugin command failed: {}", stderr));
        }

        Ok(String::from_utf8(output.stdout)?)
    }

    /// Load plugin manifest
    pub fn load_manifest(path: impl AsRef<Path>) -> Result<PluginManifest> {
        let content = std::fs::read_to_string(path)?;
        let manifest = toml::from_str(&content)?;
        Ok(manifest)
    }

    /// Validate plugin manifest
    pub fn validate_manifest(manifest: &PluginManifest) -> Result<()> {
        if manifest.name.is_empty() {
            return Err(anyhow!("Plugin name is required"));
        }

        if manifest.version.is_empty() {
            return Err(anyhow!("Plugin version is required"));
        }

        if manifest.entry_point.is_empty() {
            return Err(anyhow!("Plugin entry point is required"));
        }

        if manifest.commands.is_empty() {
            return Err(anyhow!("Plugin must define at least one command"));
        }

        Ok(())
    }
}

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

    #[test]
    fn test_plugin_manifest() {
        let manifest = PluginManifest {
            name: "test-plugin".to_string(),
            version: "1.0.0".to_string(),
            description: "A test plugin".to_string(),
            author: "Test Author".to_string(),
            entry_point: "/path/to/plugin".to_string(),
            commands: vec![],
            dependencies: Vec::new(),
            requires_admin: false,
            min_cli_version: "1.0.0".to_string(),
        };

        assert_eq!(manifest.name, "test-plugin");
        assert_eq!(manifest.version, "1.0.0");
    }

    #[test]
    fn test_plugin_registry_register() {
        let mut registry = PluginRegistry::new();
        let plugin = PluginInfo {
            name: "test".to_string(),
            version: "1.0.0".to_string(),
            path: PathBuf::from("/test"),
            enabled: true,
            installed_at: "2024-01-01T00:00:00Z".to_string(),
            updated_at: "2024-01-01T00:00:00Z".to_string(),
        };

        registry.register(plugin);
        assert_eq!(registry.count(), 1);
        assert!(registry.get("test").is_some());
    }

    #[test]
    fn test_plugin_registry_enable_disable() {
        let mut registry = PluginRegistry::new();
        let plugin = PluginInfo {
            name: "test".to_string(),
            version: "1.0.0".to_string(),
            path: PathBuf::from("/test"),
            enabled: true,
            installed_at: "2024-01-01T00:00:00Z".to_string(),
            updated_at: "2024-01-01T00:00:00Z".to_string(),
        };

        registry.register(plugin);
        registry.disable("test").unwrap();
        assert!(!registry.get("test").unwrap().enabled);

        registry.enable("test").unwrap();
        assert!(registry.get("test").unwrap().enabled);
    }

    #[test]
    fn test_plugin_registry_list_enabled() {
        let mut registry = PluginRegistry::new();
        let plugin1 = PluginInfo {
            name: "test1".to_string(),
            version: "1.0.0".to_string(),
            path: PathBuf::from("/test1"),
            enabled: true,
            installed_at: "2024-01-01T00:00:00Z".to_string(),
            updated_at: "2024-01-01T00:00:00Z".to_string(),
        };

        let plugin2 = PluginInfo {
            name: "test2".to_string(),
            version: "1.0.0".to_string(),
            path: PathBuf::from("/test2"),
            enabled: false,
            installed_at: "2024-01-01T00:00:00Z".to_string(),
            updated_at: "2024-01-01T00:00:00Z".to_string(),
        };

        registry.register(plugin1);
        registry.register(plugin2);
        assert_eq!(registry.count_enabled(), 1);
    }

    #[test]
    fn test_validate_manifest_success() {
        let manifest = PluginManifest {
            name: "test".to_string(),
            version: "1.0.0".to_string(),
            description: "Test".to_string(),
            author: "Test".to_string(),
            entry_point: "/test".to_string(),
            commands: vec![PluginCommand {
                name: "test".to_string(),
                description: "Test command".to_string(),
                args: Vec::new(),
                options: Vec::new(),
            }],
            dependencies: Vec::new(),
            requires_admin: false,
            min_cli_version: "1.0.0".to_string(),
        };

        assert!(PluginManager::validate_manifest(&manifest).is_ok());
    }

    #[test]
    fn test_validate_manifest_missing_name() {
        let manifest = PluginManifest {
            name: String::new(),
            version: "1.0.0".to_string(),
            description: "Test".to_string(),
            author: "Test".to_string(),
            entry_point: "/test".to_string(),
            commands: vec![],
            dependencies: Vec::new(),
            requires_admin: false,
            min_cli_version: "1.0.0".to_string(),
        };

        assert!(PluginManager::validate_manifest(&manifest).is_err());
    }

    #[test]
    fn test_command_definition() {
        let cmd = PluginCommand {
            name: "test".to_string(),
            description: "Test command".to_string(),
            args: vec![CommandArg {
                name: "arg1".to_string(),
                description: "First argument".to_string(),
                optional: false,
            }],
            options: vec![CommandOption {
                long: "option".to_string(),
                short: Some("o".to_string()),
                description: "Test option".to_string(),
                takes_value: true,
            }],
        };

        assert_eq!(cmd.name, "test");
        assert_eq!(cmd.args.len(), 1);
        assert_eq!(cmd.options.len(), 1);
    }
}
