#!/usr/bin/env nu
# Build independent commands and a committed source snapshot of their repository.
def main [destination?: path] {
    let here = $env.FILE_PWD
    let destination = ($destination | default ($here | path join .. target userland bundle) | path expand)
    let bin = ($destination | path join bin)
    let object = ($here | path join cwd-init init.o)
    let sources = [($here | path join cwd-init init.rs) ($here | path join cwd-init exit.wit) ($here | path join cwd-init build.nu)]
    if not ($object | path exists) or ($sources | any {|source| (ls $source | get modified.0) > (ls $object | get modified.0) }) {
        ^nu ($here | path join cwd-init build.nu)
        if $env.LAST_EXIT_CODE != 0 { error make {msg: 'cwd-init build failed'} }
    }
    let metadata = (do { cd $here; ^cargo metadata --no-deps --format-version 1 } | from json)
    do { cd $here; ^cargo build --workspace --release --locked }
    if $env.LAST_EXIT_CODE != 0 { error make {msg: 'userland build failed'} }
    ^nu ($here | path join brush build.nu)
    if $env.LAST_EXIT_CODE != 0 { error make {msg: 'brush build failed'} }
    mkdir $bin
    for package in ($metadata.packages | where {|p| $p.id in $metadata.workspace_members }) {
        let tools = ($package.manifest_path | path dirname | path join tools.txt)
        for binary in ($package.targets | where {|t| 'bin' in $t.kind }) {
            let source = ($metadata.target_directory | path join wasm32-wasip2 release $'($binary.name).wasm')
            let names = if ($tools | path exists) { open --raw $tools | lines | where {|s| ($s | str trim) != '' } } else { [$binary.name] }
            for name in $names {
                ^cp --remove-destination $source ($bin | path join $'($name).wasm')
                if $env.LAST_EXIT_CODE != 0 { error make {msg: $'bundle copy failed: ($name)'} }
            }
        }
    }
    let brush_metadata = (^cargo metadata --manifest-path ($here | path join brush source Cargo.toml) --no-deps --format-version 1 | from json)
    let brush = ($brush_metadata.target_directory | path join wasm32-wasip2 release brush.wasm)
    for name in [sh bash] {
        ^cp --remove-destination $brush ($bin | path join $'($name).wasm')
        if $env.LAST_EXIT_CODE != 0 { error make {msg: 'brush copy failed'} }
    }
    let repo = ($here | path join .. | path expand)
    let revision = (^git -C $repo rev-parse HEAD | str trim)
    let snapshot = ($destination | path join src sausage)
    if ($snapshot | path exists) { rm --recursive --force $snapshot }
    mkdir $snapshot
    let archive = ($destination | path join source.tar)
    ^git -C $repo archive --output $archive HEAD host vfs userland Cargo.toml Cargo.lock flake.nix flake.lock README.md AGENTS.md .gitignore
    if $env.LAST_EXIT_CODE != 0 { error make {msg: 'source archive failed'} }
    ^tar -xf $archive -C $snapshot
    if $env.LAST_EXIT_CODE != 0 { error make {msg: 'source extraction failed'} }
    rm $archive
    ^git -C $snapshot init --quiet --initial-branch=main
    if $env.LAST_EXIT_CODE != 0 { error make {msg: 'source git init failed'} }
    ^git -C $snapshot add host vfs userland Cargo.toml Cargo.lock flake.nix flake.lock README.md AGENTS.md .gitignore
    if $env.LAST_EXIT_CODE != 0 { error make {msg: 'source git add failed'} }
    with-env {
        GIT_AUTHOR_NAME: 'Sausage', GIT_AUTHOR_EMAIL: 'sausage@localhost',
        GIT_COMMITTER_NAME: 'Sausage', GIT_COMMITTER_EMAIL: 'sausage@localhost',
        GIT_AUTHOR_DATE: '2000-01-01T00:00:00+0000', GIT_COMMITTER_DATE: '2000-01-01T00:00:00+0000'
    } {
        ^git -C $snapshot commit --no-gpg-sign --quiet -m $'Bundle source ($revision)'
        if $env.LAST_EXIT_CODE != 0 { error make {msg: 'source git commit failed'} }
    }
    print $destination
}