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use crate::changestore::ChangeStore;
use crate::path;
use crate::pristine::*;
use std::collections::HashMap;

mod output;
pub use output::*;
mod archive;
pub use archive::*;

#[derive(Debug)]
struct OutputItem {
    parent: Inode,
    path: String,
    meta: InodeMetadata,
    pos: Position<ChangeId>,
    inode: Option<(Inode, Position<ChangeId>)>,
    is_zombie: bool,
}

fn collect_children<T: TxnT, P: ChangeStore>(
    txn: &T,
    changes: &P,
    channel: &Channel<T>,
    inode_pos: Position<ChangeId>,
    inode: Inode,
    path: &str,
    prefix_basename: Option<&str>,
    files: &mut HashMap<String, Vec<(Vertex<ChangeId>, OutputItem)>>,
) -> Result<(), anyhow::Error> {
    debug!("path = {:?}", path);
    for e in iter_adjacent(
        txn,
        &channel,
        inode_pos.inode_vertex(),
        EdgeFlags::empty(),
        EdgeFlags::all(),
    ) {
        debug!("inode_pos, e = {:?}", e);
    }
    for e in iter_adjacent(
        txn,
        &channel,
        inode_pos.inode_vertex(),
        EdgeFlags::FOLDER,
        EdgeFlags::FOLDER | EdgeFlags::PSEUDO | EdgeFlags::BLOCK,
    ) {
        // org id Gb4FgVTFFkCPgh6xtUjeL/ntA6wAsIKhRiiX/8b4Jy8=
        // This unwrap is ok since e.dest is in the channel.
        let name_vertex = find_block(txn, &channel, e.dest).unwrap();
        let mut name_buf = Vec::new();
        changes.get_contents(|h| txn.get_external(h), name_vertex, &mut name_buf)?;
        let (perms, basename) = name_buf.as_slice().split_at(2);
        let (perms, basename) = (
            InodeMetadata::from_basename(perms),
            std::str::from_utf8(basename).unwrap(),
        );
        debug!("filename: {:?} {:?}", perms, basename);
        let mut name = path.to_string();
        if let Some(next) = prefix_basename {
            if next != basename {
                continue;
            }
        }
        path::push(&mut name, basename);
        // org id RFCdVpFfGZuILPerwkNtNS2jmRrxrMOGl0kh7aVMVmM=
        debug!("name_vertex: {:?} {:?}", e, name_vertex);
        for e in iter_adjacent(
            txn,
            &channel,
            name_vertex,
            EdgeFlags::empty(),
            EdgeFlags::all(),
        ) {
            debug!("e = {:?}", e);
        }
        let child = if let Some(child) = iter_adjacent(
            txn,
            &channel,
            name_vertex,
            EdgeFlags::FOLDER,
            EdgeFlags::FOLDER | EdgeFlags::BLOCK | EdgeFlags::PSEUDO,
        )
        .next()
        {
            child
        } else {
            let child = iter_adjacent(
                txn,
                &channel,
                name_vertex,
                EdgeFlags::FOLDER,
                EdgeFlags::all(),
            )
            .filter(|e| !e.flag.contains(EdgeFlags::PARENT))
            .next()
            .unwrap();

            let mut f = std::fs::File::create("debug_output").unwrap();
            debug_root(txn, channel, child.dest.inode_vertex(), &mut f).unwrap();
            panic!("no child");
        };

        debug!("child: {:?}", child);
        let child_inode = txn
            .get_revinodes(child.dest, None)
            .map(|inode| (inode, txn.get_inodes(inode, None).unwrap()));
        debug!("child_inode: {:?}", child_inode);
        let v = files.entry(name).or_insert(Vec::new());
        v.push((
            name_vertex,
            OutputItem {
                parent: inode,
                path: path.to_string(),
                meta: perms,
                pos: child.dest,
                inode: child_inode,
                is_zombie: is_zombie(txn, channel, child.dest),
            },
        ));
    }
    Ok(())
}

fn is_zombie<T: TxnT>(txn: &T, channel: &Channel<T>, pos: Position<ChangeId>) -> bool {
    let f = EdgeFlags::FOLDER | EdgeFlags::PARENT | EdgeFlags::DELETED;
    iter_adjacent(txn, &channel, pos.inode_vertex(), f, f | EdgeFlags::BLOCK)
        .next()
        .is_some()
}