use anyhow::{bail, Result};
use clap::Parser;
use io_imap::{
    coroutines::{select::*, store::*},
    types::{
        flag::{Flag, StoreType},
        IntoStatic,
    },
};
use io_stream::runtimes::std::handle;
use pimalaya_toolbox::terminal::printer::{Message, Printer};

use crate::{config::ImapConfig, imap::mailbox::arg::name::MailboxNameOptionalFlag, imap::stream};

/// Set flags on messages (replacing existing flags).
///
/// This command replaces all existing flags on messages identified by
/// the given sequence set with the specified flags.
#[derive(Debug, Parser)]
pub struct SetFlagsCommand {
    #[command(flatten)]
    pub mailbox: MailboxNameOptionalFlag,

    /// The sequence set of messages (e.g., "1", "1,2,3", "1:*").
    #[arg(name = "sequence_set", value_name = "SEQUENCE")]
    pub sequence_set: String,

    /// The flags to set (e.g., "\\Seen", "\\Flagged").
    #[arg(short, long, required = true, num_args = 1..)]
    pub flags: Vec<String>,

    /// Use sequence numbers instead of UIDs.
    #[arg(long)]
    pub seq: bool,
}

impl SetFlagsCommand {
    pub fn execute(self, printer: &mut impl Printer, config: ImapConfig) -> Result<()> {
        let (context, mut stream) = stream::connect(config)?;

        let mailbox = self.mailbox.name.try_into()?;

        // First, SELECT the mailbox
        let mut arg = None;
        let mut coroutine = ImapSelect::new(context, mailbox);

        let context = loop {
            match coroutine.resume(arg.take()) {
                ImapSelectResult::Io { io } => arg = Some(handle(&mut stream, io)?),
                ImapSelectResult::Ok { context, .. } => break context,
                ImapSelectResult::Err { err, .. } => bail!(err),
            }
        };

        // Parse flags
        let flags: Vec<Flag<'static>> = self
            .flags
            .iter()
            .map(|f| Flag::try_from(f.as_str()).map(|flag| flag.into_static()))
            .collect::<Result<_, _>>()?;

        // Parse sequence set
        let sequence_set = self.sequence_set.as_str().try_into()?;

        // Store flags
        let mut arg = None;
        let mut coroutine =
            ImapStoreSilent::new(context, sequence_set, StoreType::Replace, flags, !self.seq);

        loop {
            match coroutine.resume(arg.take()) {
                ImapStoreSilentResult::Io { io } => arg = Some(handle(&mut stream, io)?),
                ImapStoreSilentResult::Ok { .. } => break,
                ImapStoreSilentResult::Err { err, .. } => bail!(err),
            }
        }

        printer.out(Message::new("Flag(s) successfully set"))
    }
}