use anyhow::{anyhow, Result};
use std::io::{Write};

use crate::common::is_binary::is_binary;
use crate::common::PIPESIZE;
use crate::config;
use crate::services::item_service::ItemService;
use clap::Command;
use is_terminal::IsTerminal;
use std::path::PathBuf;

pub fn mode_get(
    cmd: &mut Command,
    settings: &config::Settings,
    ids: &mut Vec<i64>,
    tags: &mut Vec<String>,
    conn: &mut rusqlite::Connection,
    data_path: PathBuf,
) -> Result<()> {
    if !ids.is_empty() && !tags.is_empty() {
        cmd.error(clap::error::ErrorKind::InvalidValue, "Both ID and tags given, you must supply exactly one ID or at least one tag when using --get").exit();
    } else if ids.len() > 1 {
        cmd.error(clap::error::ErrorKind::InvalidValue, "More than one ID given, you must supply exactly one ID or at least one tag when using --get").exit();
    }

    let item_service = ItemService::new(data_path.clone());
    let item_with_meta = item_service.find_item(conn, ids, tags, &std::collections::HashMap::new())
        .map_err(|e| anyhow!("Unable to find matching item in database: {}", e))?;
    
    let item_id = item_with_meta.item.id.unwrap();
    
    // Determine if we should detect binary data
    let mut detect_binary = !settings.force && std::io::stdout().is_terminal();

    if detect_binary {
        let meta_map = item_with_meta.meta_as_map();
        if let Some(text_val) = meta_map.get("text") {
            if text_val == "true" {
                detect_binary = false;
            } else if text_val == "false" {
                return Err(anyhow!(
                    "Refusing to output binary data to TTY, use --force to override"
                ));
            }
        }
    }

    // Use streaming approach to handle large files
    let mut reader = item_service.get_compression_service().stream_item_content(
        data_path.join(item_id.to_string()),
        &item_with_meta.item.compression
    )?;

    if detect_binary {
        // Read only the first 8192 bytes for binary detection
        let mut sample_buffer = vec![0; PIPESIZE];
        let bytes_read = reader.read(&mut sample_buffer)?;
        if is_binary(&sample_buffer[..bytes_read]) {
            return Err(anyhow!(
                "Refusing to output binary data to TTY, use --force to override"
            ));
        }
        // We need to create a new reader since we consumed some bytes
        reader = item_service.get_compression_service().stream_item_content(
            data_path.join(item_id.to_string()),
            &item_with_meta.item.compression
        )?;
    }

    // Stream the content to stdout
    let mut stdout = std::io::stdout();
    let mut buffer = [0; PIPESIZE];
    loop {
        let bytes_read = reader.read(&mut buffer)?;
        if bytes_read == 0 {
            break;
        }
        stdout.write_all(&buffer[..bytes_read])?;
    }
    Ok(())
}