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#!/bin/bash

echo

show_usage() {
    cat << EOF
Rename a set of branches, effectively DELETING old
branches and creating new ones based on the old ones.

USAGE
    $(basename "$0") <remote> <query>
    
    remote          A GIT remote (usually origin)
    find            A search query to grep for a set of branches
    replace         Text to replace the find query with

EXAMPLE
    $(basename "$0") origin "1.2.2" "1.2.4"

EOF
}

if [[ -z "$1" ]] || [[ -z "$2" ]] || [[ -z "$3" ]]; then
    show_usage
    exit 1
fi

# Get a list of branches - local only, for now
oldbranches=$(git branch -l | grep "$2")
newbranches=()

echo "Here are the branches and what they will be renamed to."
echo

for branch in $oldbranches; do
    echo "$branch"
    newbranches+=(${branch/"$2"/"$3"})
    echo ${newbranches[${#newbranches[@]} - 1]}
    echo
done

# Confirm rename
read -r -p "Are you sure you want to rename these local branches? [y/N] " response
if [[ $response =~ ^([yY][eE][sS]|[yY])$ ]]; then
    echo "OK"
    echo ""
else
    echo "Cancelled"
    exit 2
fi

# Move (rename) branches
i=0
for oldbranch in $oldbranches; do
    git branch -m $oldbranch ${newbranches[$i]}
    i=$[i + 1]
done

# Confirm remote delete
read -r -p "Would you like to delete old branches from all remotes? [y/N] " response
if [[ $response =~ ^([yY][eE][sS]|[yY])$ ]]; then
    echo "OK"
    echo ""
else
    echo "Cancelled"
    exit 2
fi

remotes=$(git remote | cut -f1)

for branch in $oldbranches; do
    for remote in $remotes; do
        git push $remote :$branch
    done
done

echo

# Confirm new push
read -r -p "Would you like to push renamed branches to all remotes? [y/N] " response
if [[ $response =~ ^([yY][eE][sS]|[yY])$ ]]; then
    echo "OK"
    echo ""
else
    echo "Cancelled"
    exit 2
fi

# Push all new branches
newbranches_len=${#newbranches[@]}
for (( i=0; i < ${newbranches_len}; i++ )); do
    for remote in $remotes; do
        git push $remote ${newbranches[$i]}
    done
done

echo
echo
echo "Finished renaming $newbranches_len branches."