use clap::Parser;
use color_eyre::Result;
use email::{backend::feature::BackendFeatureSource, config::Config};
use pimalaya_tui::{
    himalaya::backend::BackendBuilder,
    terminal::{cli::printer::Printer, config::TomlConfig as _},
};
use std::{
    io::{self, BufRead, IsTerminal},
    sync::Arc,
};
use tracing::info;

use crate::{
    account::arg::name::AccountNameFlag, config::TomlConfig,
    folder::arg::name::FolderNameOptionalFlag, message::arg::MessageRawArg,
};

/// Save a message to a folder.
///
/// This command allows you to add a raw message to the given folder.
#[derive(Debug, Parser)]
pub struct MessageSaveCommand {
    #[command(flatten)]
    pub folder: FolderNameOptionalFlag,

    #[command(flatten)]
    pub message: MessageRawArg,

    #[command(flatten)]
    pub account: AccountNameFlag,
}

impl MessageSaveCommand {
    pub async fn execute(self, printer: &mut impl Printer, config: &TomlConfig) -> Result<()> {
        info!("executing save message command");

        let folder = &self.folder.name;

        let (toml_account_config, account_config) = config
            .clone()
            .into_account_configs(self.account.name.as_deref(), |c: &Config, name| {
                c.account(name).ok()
            })?;

        let backend = BackendBuilder::new(
            Arc::new(toml_account_config),
            Arc::new(account_config),
            |builder| {
                builder
                    .without_features()
                    .with_add_message(BackendFeatureSource::Context)
            },
        )
        .without_sending_backend()
        .build()
        .await?;

        let is_tty = io::stdin().is_terminal();
        let is_json = printer.is_json();
        let msg = if is_tty || is_json {
            self.message.raw()
        } else {
            io::stdin()
                .lock()
                .lines()
                .map_while(Result::ok)
                .collect::<Vec<String>>()
                .join("\r\n")
        };

        backend.add_message(folder, msg.as_bytes()).await?;

        printer.out(format!("Message successfully saved to {folder}!\n"))
    }
}