use anyhow::Result;
use clap::Command;
use serde::{Deserialize, Serialize};
use serde_yaml;
use crate::meta_plugin::MetaPlugin;

#[derive(Debug, Serialize, Deserialize)]
struct DefaultConfig {
    dir: Option<String>,
    list_format: Vec<ColumnConfig>,
    human_readable: bool,
    output_format: Option<String>,
    quiet: bool,
    force: bool,
    server: Option<ServerConfig>,
    compression_plugin: Option<CompressionPluginConfig>,
    meta_plugins: Option<Vec<MetaPluginConfig>>,
}

#[derive(Debug, Serialize, Deserialize)]
struct ColumnConfig {
    name: String,
    label: Option<String>,
    #[serde(default)]
    align: ColumnAlignment,
    #[serde(default)]
    max_len: Option<String>,
}

#[derive(Debug, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
enum ColumnAlignment {
    #[default]
    Left,
    Right,
}

#[derive(Debug, Serialize, Deserialize)]
struct ServerConfig {
    address: Option<String>,
    port: Option<u16>,
    password_file: Option<String>,
    password: Option<String>,
    password_hash: Option<String>,
}

#[derive(Debug, Serialize, Deserialize)]
struct CompressionPluginConfig {
    name: String,
}

#[derive(Debug, Serialize, Deserialize)]
struct MetaPluginConfig {
    name: String,
    #[serde(default)]
    options: std::collections::HashMap<String, serde_yaml::Value>,
    #[serde(default)]
    outputs: std::collections::HashMap<String, String>,
}

pub fn mode_generate_config(_cmd: &mut Command, _settings: &crate::config::Settings) -> Result<()> {
    // Create instances of each meta plugin to get their default options and outputs
    let text_plugin = crate::meta_plugin::text::TextMetaPlugin::new(None, None);
    let cwd_plugin = crate::meta_plugin::cwd::CwdMetaPlugin::new(None, None);
    let digest_plugin = crate::meta_plugin::digest::DigestMetaPlugin::new(None, None);
    let hostname_plugin = crate::meta_plugin::hostname::HostnameMetaPlugin::new(None, None);
    let magic_file_plugin = crate::meta_plugin::magic::MagicFileMetaPlugin::new(None, None);
    
    // Create a default configuration
    let default_config = DefaultConfig {
        dir: Some("~/.local/share/keep".to_string()),
        list_format: vec![
            ColumnConfig {
                name: "id".to_string(),
                label: Some("Item".to_string()),
                align: ColumnAlignment::Right,
                max_len: None,
            },
            ColumnConfig {
                name: "time".to_string(),
                label: Some("Time".to_string()),
                align: ColumnAlignment::Right,
                max_len: None,
            },
            ColumnConfig {
                name: "size".to_string(),
                label: Some("Size".to_string()),
                align: ColumnAlignment::Right,
                max_len: None,
            },
            ColumnConfig {
                name: "meta:text_line_count".to_string(),
                label: Some("Lines".to_string()),
                align: ColumnAlignment::Right,
                max_len: None,
            },
            ColumnConfig {
                name: "tags".to_string(),
                label: Some("Tags".to_string()),
                align: ColumnAlignment::Left,
                max_len: Some("40".to_string()),
            },
            ColumnConfig {
                name: "meta:hostname_full".to_string(),
                label: Some("Hostname".to_string()),
                align: ColumnAlignment::Left,
                max_len: Some("28".to_string()),
            },
        ],
        human_readable: false,
        output_format: Some("table".to_string()),
        quiet: false,
        force: false,
        server: Some(ServerConfig {
            address: Some("127.0.0.1".to_string()),
            port: Some(8080),
            password_file: None,
            password: None,
            password_hash: None,
        }),
        compression_plugin: None,
        meta_plugins: Some(vec![
            MetaPluginConfig {
                name: "text".to_string(),
                options: text_plugin.options().clone(),
                outputs: convert_outputs_to_string_map(text_plugin.outputs()),
            },
            MetaPluginConfig {
                name: "cwd".to_string(),
                options: cwd_plugin.options().clone(),
                outputs: convert_outputs_to_string_map(cwd_plugin.outputs()),
            },
            MetaPluginConfig {
                name: "digest".to_string(),
                options: digest_plugin.options().clone(),
                outputs: convert_outputs_to_string_map(digest_plugin.outputs()),
            },
            MetaPluginConfig {
                name: "hostname".to_string(),
                options: hostname_plugin.options().clone(),
                outputs: convert_outputs_to_string_map(hostname_plugin.outputs()),
            },
            MetaPluginConfig {
                name: "magic_file".to_string(),
                options: magic_file_plugin.options().clone(),
                outputs: convert_outputs_to_string_map(magic_file_plugin.outputs()),
            },
        ]),
    };
    
    // Serialize to YAML and print to stdout
    let yaml = serde_yaml::to_string(&default_config)?;
    println!("{}", yaml);
    
    Ok(())
}

// Helper function to convert outputs from serde_yaml::Value to String
fn convert_outputs_to_string_map(
    outputs: &std::collections::HashMap<String, serde_yaml::Value>,
) -> std::collections::HashMap<String, String> {
    let mut result = std::collections::HashMap::new();
    for (key, value) in outputs {
        if let Some(str_value) = value.as_str() {
            result.insert(key.clone(), str_value.to_string());
        } else {
            // Convert non-string values to their YAML string representation
            result.insert(key.clone(), serde_yaml::to_string(value).unwrap_or_default());
        }
    }
    result
}