use crate::config;
use crate::compression_engine::CompressionType;
use crate::meta_plugin::MetaPluginType;
use clap::Command;
use clap::error::ErrorKind;
use comfy_table::{Table, ContentArrangement};
use log::debug;
use regex::Regex;
use std::collections::HashMap;
use std::env;
use std::str::FromStr;
use strum::IntoEnumIterator;
#[derive(Debug, Clone, strum::EnumString, strum::Display, PartialEq)]
#[strum(ascii_case_insensitive)]
pub enum OutputFormat {
    Table,
    Json,
    Yaml,
}

pub fn get_meta_from_env() -> HashMap<String, String> {
    debug!("COMMON: Getting meta from KEEP_META_*");
    let re = Regex::new(r"^KEEP_META_(.+)$").unwrap();
    let mut meta_env: HashMap<String, String> = HashMap::new();
    for (key, value) in env::vars() {
        if let Some(meta_name_caps) = re.captures(key.as_str()) {
            let name = String::from(meta_name_caps.get(1).unwrap().as_str());
            // Ignore KEEP_META_PLUGINS
            if name != "PLUGINS" {
                debug!("COMMON: Found meta: {}={}", name.clone(), value.clone());
                meta_env.insert(name, value.clone());
            }
        }
    }
    meta_env
}

pub fn format_size(size: u64, human_readable: bool) -> String {
    match human_readable {
        true => humansize::format_size(size, humansize::DECIMAL),
        false => size.to_string(),
    }
}



#[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString)]
#[strum(ascii_case_insensitive)]
pub enum ColumnType {
    Id,
    Time,
    Size,
    Compression,
    FileSize,
    FilePath,
    Tags,
    Meta,
}

impl ColumnType {
    /// Returns a Result with error message if the string is not a valid ColumnType
    pub fn from_str(s: &str) -> anyhow::Result<Self> {
        if s.starts_with("meta:") {
            // Handle meta:<name> pattern - this is still a Meta column type
            Ok(ColumnType::Meta)
        } else {
            // Handle regular column types
            Ok(Self::try_from(s)?)
        }
    }
}

// impl TryFrom<&str> for ColumnType is already implemented by strum_macros
// so we remove this conflicting implementation





pub fn settings_meta_plugin_types(cmd: &mut Command, settings: &config::Settings) -> Vec<MetaPluginType> {
    let mut meta_plugin_types = Vec::new();
    
    // Handle comma-separated values in each meta_plugins argument
    for meta_plugin_names_str in &settings.meta_plugins_names() {
        let meta_plugin_names: Vec<&str> = meta_plugin_names_str.split(',').collect();
        
        for name in meta_plugin_names {
            let trimmed_name = name.trim();
            if trimmed_name.is_empty() {
                continue;
            }
            
            // Try to find the MetaPluginType by meta name
            let mut found = false;
            for meta_plugin_type in MetaPluginType::iter() {
                let meta_plugin = crate::meta_plugin::get_meta_plugin(meta_plugin_type.clone(), None, None);
                if meta_plugin.meta_type().to_string() == trimmed_name {
                    meta_plugin_types.push(meta_plugin_type);
                    found = true;
                    break;
                }
            }
            
            if !found {
                cmd.error(
                    ErrorKind::InvalidValue,
                    format!("Unknown meta plugin type: {}", trimmed_name),
                )
                .exit();
            }
        }
    }

    meta_plugin_types
}


pub fn settings_compression_type(cmd: &mut Command, settings: &config::Settings) -> CompressionType {
    let compression_name = settings
        .compression()
        .unwrap_or(CompressionType::LZ4.to_string());

    let compression_type_opt = CompressionType::from_str(&compression_name);
    if compression_type_opt.is_err() {
        cmd.error(
            ErrorKind::InvalidValue,
            format!("Invalid compression algorithm '{}'. Supported algorithms: lz4, gzip, xz, zstd", compression_name),
        )
        .exit();
    }

    compression_type_opt.unwrap()
}

pub fn settings_output_format(settings: &config::Settings) -> OutputFormat {
    settings.output_format
        .as_ref()
        .and_then(|s| OutputFormat::from_str(s).ok())
        .unwrap_or(OutputFormat::Table)
}

/// Create a table with consistent styling and terminal detection
pub fn create_table(use_styling: bool) -> Table {
    let mut table = Table::new();
    table.set_content_arrangement(ContentArrangement::Dynamic);
    
    if use_styling {
        table
            .load_preset(comfy_table::presets::UTF8_FULL)
            .apply_modifier(comfy_table::modifiers::UTF8_ROUND_CORNERS);
    } else {
        table.load_preset(comfy_table::presets::NOTHING);
    }
    
    table.force_no_tty_if(!std::io::stdout().is_terminal());
    table
}