use crate::config;
use crate::services::item_service::ItemService;
use crate::services::types::ItemWithMeta;
use crate::modes::common::ColumnType;
use crate::modes::common::{size_column, string_column, OutputFormat};
use anyhow::{Result};
use log::debug;
use comfy_table::{Table, ContentArrangement, Cell, Row, Color, Attribute};
use comfy_table::presets::NOTHING;
use comfy_table::CellAlignment;
use serde::{Deserialize, Serialize};
use serde_json;
use serde_yaml;
use std::io::{stdout, IsTerminal};

#[derive(Serialize, Deserialize)]
struct ListItem {
    id: Option<i64>,
    time: String,
    size: Option<u64>,
    size_formatted: String,
    compression: String,
    file_size: Option<u64>,
    file_size_formatted: String,
    file_path: String,
    tags: Vec<String>,
    meta: std::collections::HashMap<String, String>,
}

pub fn mode_list(
    cmd: &mut clap::Command,
    settings: &config::Settings,
    ids: &mut Vec<i64>,
    tags: &Vec<String>,
    conn: &mut rusqlite::Connection,
    data_path: std::path::PathBuf,
) -> Result<()> {
    if !ids.is_empty() {
        cmd.error(
            clap::error::ErrorKind::InvalidValue,
            "ID given, you can only supply tags when using --list",
        )
        .exit();
    }

    let item_service = ItemService::new(data_path.clone());
    let items_with_meta = item_service.list_items(conn, tags, &std::collections::HashMap::new())?;

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

    if output_format != OutputFormat::Table {
        return show_list_structured(items_with_meta, data_path, settings, output_format);
    }

    let mut table = Table::new();
    table
        .load_preset(NOTHING)
        .set_content_arrangement(ContentArrangement::Dynamic);
    
    if !stdout().is_terminal() {
        table.force_no_tty();
    }

    // Create header row
    let mut header_cells = Vec::new();
    for column in &settings.list_format {
        header_cells.push(Cell::new(&column.label).add_attribute(Attribute::Bold));
    }
    table.set_header(header_cells);

    for item_with_meta in items_with_meta {
        let tags: Vec<String> = item_with_meta.tags.iter().map(|t| t.name.clone()).collect();
        let meta = item_with_meta.meta_as_map();
        let item = item_with_meta.item;

        let mut item_path = data_path.clone();
        item_path.push(item.id.unwrap().to_string());

        let mut table_row = Row::new();

        for column in &settings.list_format {
            let column_type = ColumnType::from_str(&column.name)
                .unwrap_or_else(|_| panic!("Unknown column {:?}", column.name));

            let mut meta_name: Option<&str> = None;

            if let ColumnType::Meta = column_type {
                let parts: Vec<&str> = column.name.split(':').collect();
                if parts.len() > 1 {
                    meta_name = Some(parts[1]);
                }
            }

            let mut cell = match column_type {
                ColumnType::Id => Cell::new(item.id.unwrap_or(0).to_string()),
                ColumnType::Time => Cell::new(
                    item.ts
                        .with_timezone(&chrono::Local)
                        .format("%F %T")
                        .to_string(),
                ),
                ColumnType::Size => match item.size {
                    Some(size) => Cell::new(format_size(
                        size as u64,
                        settings.human_readable,
                    )),
                    None => match item_path.metadata() {
                        Ok(_) => Cell::new("Unknown")
                            .fg(Color::Yellow)
                            .add_attribute(Attribute::Bold),
                        Err(_) => Cell::new("Missing")
                            .fg(Color::Red)
                            .add_attribute(Attribute::Bold),
                    },
                },
                ColumnType::Compression => Cell::new(item.compression.to_string()),
                ColumnType::FileSize => match item_path.metadata() {
                    Ok(metadata) => Cell::new(format_size(
                        metadata.len(),
                        settings.human_readable,
                    )),
                    Err(_) => Cell::new("Missing")
                        .fg(Color::Red)
                        .add_attribute(Attribute::Bold),
                },
                ColumnType::FilePath => Cell::new(
                    item_path.clone().into_os_string().into_string().unwrap(),
                ),
                ColumnType::Tags => Cell::new(tags.join(" ")),
                ColumnType::Meta => match meta_name {
                    Some(meta_name) => match meta.get(meta_name) {
                        Some(meta_value) => Cell::new(meta_value.to_string()),
                        None => Cell::new(""),
                    },
                    None => Cell::new(""),
                },
            };
            
            // Apply alignment in one place
            cell = match column.align {
                crate::config::ColumnAlignment::Right => cell.set_alignment(CellAlignment::Right),
                crate::config::ColumnAlignment::Left => cell.set_alignment(CellAlignment::Left),
            };
            table_row.add_cell(cell);
        }
        table.add_row(table_row);
    }

    println!("{}", table);

    Ok(())
}

fn show_list_structured(
    items_with_meta: Vec<ItemWithMeta>,
    data_path: std::path::PathBuf,
    settings: &config::Settings,
    output_format: OutputFormat,
) -> Result<()> {
    let mut list_items = Vec::new();

    for item_with_meta in items_with_meta {
        let tags: Vec<String> = item_with_meta.tags.iter().map(|t| t.name.clone()).collect();
        let meta = item_with_meta.meta_as_map();
        let item = item_with_meta.item;
        let item_id = item.id.unwrap();

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

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

        let size_formatted = match item.size {
            Some(size) => crate::modes::common::format_size(size as u64, settings.human_readable),
            None => "Unknown".to_string(),
        };

        let list_item = ListItem {
            id: item.id,
            time: item
                .ts
                .with_timezone(&chrono::Local)
                .format("%F %T")
                .to_string(),
            size: item.size.map(|s| s as u64),
            size_formatted,
            compression: item.compression,
            file_size,
            file_size_formatted,
            file_path: item_path.into_os_string().into_string().unwrap_or_default(),
            tags,
            meta,
        };

        list_items.push(list_item);
    }

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

    Ok(())
}