use crate::db::Item;
use crate::modes::common::{format_size, OutputFormat};
use crate::config;
use anyhow::anyhow;
use serde_json;
use serde_yaml;
use serde::{Deserialize, Serialize};
use clap::Command;
use clap::error::ErrorKind;
use std::path::PathBuf;
use std::str::FromStr;

use crate::compression_engine::CompressionType;
use crate::db::{get_item, get_item_last, get_item_matching};
use crate::modes::common::get_format_box_chars_no_border_line_separator;
use chrono::prelude::*;
use is_terminal::IsTerminal;
use prettytable::format;
use prettytable::{Attr, Cell, Row, Table};

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

    let mut meta: std::collections::HashMap<String, String> = std::collections::HashMap::new();
    // Collect metadata from environment variables
    for (key, value) in std::env::vars() {
        if key.starts_with("KEEP_META_") && key != "KEEP_META_PLUGINS" {
            let meta_name = key.strip_prefix("KEEP_META_").unwrap();
            meta.insert(meta_name.to_string(), value);
        }
    }

    let item_maybe = match tags.is_empty() && meta.is_empty() {
        true => match ids.iter().next() {
            Some(item_id) => get_item(conn, *item_id)?,
            None => get_item_last(conn)?,
        },
        false => get_item_matching(conn, tags, &meta)?,
    };

    match item_maybe {
        Some(item) => show_item(item, settings, conn, data_path),
        None => Err(anyhow!("Unable to find matching item in database")),
    }
}

#[derive(Serialize, Deserialize)]
struct ItemInfo {
    id: i64,
    timestamp: String,
    path: String,
    stream_size: Option<u64>,
    stream_size_formatted: String,
    compression: String,
    file_size: Option<u64>,
    file_size_formatted: String,
    tags: Vec<String>,
    meta: std::collections::HashMap<String, String>,
}

fn show_item(
    item: Item, // Using the provided struct definition
    settings: &config::Settings,
    conn: &mut rusqlite::Connection,
    data_path: PathBuf,
) -> anyhow::Result<()> {
    let item_id = item.id.unwrap(); // Consider using if let or expect for Option

    let item_tags: Vec<String> = crate::db::get_item_tags(conn, &item)?
        .into_iter()
        .map(|x| x.name)
        .collect();

    let output_format = crate::modes::common::settings_output_format(settings);

    if output_format != OutputFormat::Table {
        return show_item_structured(item, settings, conn, data_path, output_format);
    }

    let mut table = Table::new();
    if std::io::stdout().is_terminal() {
        table.set_format(get_format_box_chars_no_border_line_separator());
    } else {
        table.set_format(*format::consts::FORMAT_NO_BORDER_LINE_SEPARATOR);
    }

    table.add_row(Row::new(vec![
        Cell::new("ID").with_style(Attr::Bold),
        Cell::new(&item_id.to_string()),
    ]));

    let ts_cell = Cell::new(&item.ts.with_timezone(&Local).format("%F %T %Z").to_string());
    table.add_row(Row::new(vec![
        Cell::new("Timestamp").with_style(Attr::Bold),
        ts_cell,
    ]));

    let mut item_path_buf = data_path.clone(); // Renamed to avoid conflict if item_path is used later
    item_path_buf.push(item.id.unwrap().to_string()); // Again, consider safer unwrap

    table.add_row(Row::new(vec![
        Cell::new("Path").with_style(Attr::Bold),
        Cell::new(item_path_buf.to_str().expect("Unable to get item path")),
    ]));

    let size_cell = match item.size {
        Some(size) => Cell::new(format_size(size as u64, settings.human_readable).as_str()),
        None => Cell::new("Missing")
            .with_style(Attr::ForegroundColor(prettytable::color::RED))
            .with_style(Attr::Bold),
    };
    table.add_row(Row::new(vec![
        Cell::new("Stream Size").with_style(Attr::Bold),
        size_cell,
    ]));

    // compression_type is CompressionType due to '?'
    let compression_type_val = CompressionType::from_str(&item.compression)
        .map_err(|e| anyhow!("Failed to parse compression type: {}", e))?;

    table.add_row(Row::new(vec![
        Cell::new("Compression").with_style(Attr::Bold),
        Cell::new(&compression_type_val.to_string()),
    ]));

    let file_size_cell = match item_path_buf.metadata() {
        Ok(metadata) => {
            Cell::new(format_size(metadata.len(), settings.human_readable).as_str())
        }
        Err(_) => Cell::new("Missing")
            .with_style(Attr::ForegroundColor(prettytable::color::RED))
            .with_style(Attr::Bold),
    };
    table.add_row(Row::new(vec![
        Cell::new("File Size").with_style(Attr::Bold),
        file_size_cell,
    ]));

    table.add_row(Row::new(vec![
        Cell::new("Tags").with_style(Attr::Bold),
        Cell::new(&item_tags.join(" ")),
    ]));

    for meta in crate::db::get_item_meta(conn, &item)? {
        let meta_name = format!("Meta: {}", &meta.name);
        table.add_row(Row::new(vec![
            Cell::new(meta_name.as_str()).with_style(Attr::Bold),
            Cell::new(&meta.value),
        ]));
    }

    table.printstd();
    Ok(())
}

fn show_item_structured(
    item: Item,
    settings: &config::Settings,
    conn: &mut rusqlite::Connection,
    data_path: PathBuf,
    output_format: OutputFormat,
) -> anyhow::Result<()> {
    let item_id = item.id.unwrap();
    let item_tags: Vec<String> = crate::db::get_item_tags(conn, &item)?
        .into_iter()
        .map(|x| x.name)
        .collect();

    let mut item_path_buf = data_path.clone();
    item_path_buf.push(item_id.to_string());

    let file_size = item_path_buf.metadata().map(|m| m.len()).ok();
    let file_size_formatted = match file_size {
        Some(size) => format_size(size, settings.human_readable),
        None => "Missing".to_string(),
    };

    let stream_size_formatted = match item.size {
        Some(size) => format_size(size as u64, settings.human_readable),
        None => "Missing".to_string(),
    };

    let mut meta_map = std::collections::HashMap::new();
    for meta in crate::db::get_item_meta(conn, &item)? {
        meta_map.insert(meta.name, meta.value);
    }

    let item_info = ItemInfo {
        id: item_id,
        timestamp: item.ts.with_timezone(&chrono::Local).format("%F %T %Z").to_string(),
        path: item_path_buf.to_str().unwrap_or("").to_string(),
        stream_size: item.size.map(|s| s as u64),
        stream_size_formatted,
        compression: item.compression,
        file_size,
        file_size_formatted,
        tags: item_tags,
        meta: meta_map,
    };

    match output_format {
        OutputFormat::Json => {
            println!("{}", serde_json::to_string_pretty(&item_info)?);
        }
        OutputFormat::Yaml => {
            println!("{}", serde_yaml::to_string(&item_info)?);
        }
        OutputFormat::Table => unreachable!(),
    }

    Ok(())
}