#!/usr/bin/bash
set -ex

SURL="https://cs10-koji-04.mx-os/sources"
PKGNAME=$(basename "$PWD")

if [ ! -f "sources" ]; then
    echo "No sources file found."
    exit 0
fi

while read -r alg filename_part eq hash; do
    # Format: SHA512 (filename) = hash
    # filename_part is "(filename)"
    filename="${filename_part:1:-1}" 
    
    if [ -f "$filename" ]; then
        echo "File $filename already exists, skipping."
        continue
    fi

    # Construct URL based on MxOS layout: SURL/PKGNAME/FILENAME/HASH/FILENAME
    # Note: PKGNAME might need to be passed or detected. 
    # Usually in Koji execution, PWD is the SCM root, so basename PWD should work if directory matches package name.
    # However, Koji often clones into 'ed' or similar.
    
    # Using the layout found: sources/ed/ed-1.20.tar.lz/HASH/
    # Assuming the file is INSIDE that hash directory.
    
    # Check if there's a trailing slash in SURL, remove it if so.
    SURL=${SURL%/}
    
    # Algo to lowercase
    alg_lower=$(echo "$alg" | tr '[:upper:]' '[:lower:]')
    
    # URL: SURL/rpms/PKGNAME/FILENAME/ALGO/HASH/FILENAME
    url="$SURL/rpms/$PKGNAME/$filename/$alg_lower/$hash/$filename"
    
    echo "Downloading $filename from local lookaside: $url"
    if curl -L --fail --retry 3 -o "$filename" "$url"; then
        echo "Successfully downloaded $filename from local lookaside."
    else
        upstream_url="https://sources.stream.centos.org/sources/rpms/$PKGNAME/$filename/$alg_lower/$hash/$filename"
        echo "Local download failed. Trying upstream CentOS Stream lookaside: $upstream_url"
        curl -L --fail --retry 5 -o "$filename" "$upstream_url"
    fi
    
    # Verify hash (optional but good)
    echo "$hash  $filename" | sha512sum -c -

done < sources