#!/bin/bash

# developed on macOS and probably doesn't work on Linux yet due to minor
# differences in flags on sed

# requires github cli tool for automatic release draft creation

set -eEuo pipefail

DIR=$1

LINUX=""
MACOS=""

if [ "$(uname)" = "Darwin" ]; then
    MACOS="1"
fi

CARGO_MANIFEST=$DIR/Cargo.toml
README_FILE=$DIR/README.md

# determine changelog file name
if [ -f "$DIR/CHANGES.md" ]; then
    CHANGELOG_FILE="$DIR/CHANGES.md"
elif [ -f "$DIR/CHANGELOG.md" ]; then
    CHANGELOG_FILE="$DIR/CHANGELOG.md"
fi

# get current version
PACKAGE_NAME="$(sed -nE 's/^name ?= ?"([^"]+)"$/\1/ p' "$CARGO_MANIFEST" | head -n 1)"
CURRENT_VERSION="$(sed -nE 's/^version ?= ?"([^"]+)"$/\1/ p' "$CARGO_MANIFEST" | head -n 1)"

CHANGE_CHUNK_FILE="$(mktemp)"
echo saving changelog to $CHANGE_CHUNK_FILE
echo

if [ -n "${CHANGELOG_FILE-}" ]; then
    # get changelog chunk and save to temp file
    cat "$CHANGELOG_FILE" |
        # skip up to unreleased heading
        sed '1,/Unreleased/ d' |
        # take up to previous version heading
        sed "/$CURRENT_VERSION/ q" |
        # drop last line
        sed '$d' \
            >"$CHANGE_CHUNK_FILE"
fi

# if word count of changelog chunk is 0 then insert filler changelog chunk
if [ "$(wc -w "$CHANGE_CHUNK_FILE" | awk '{ print $1 }')" = "0" ]; then
    echo "- No significant changes since \`$CURRENT_VERSION\`." >"$CHANGE_CHUNK_FILE"
    echo >>"$CHANGE_CHUNK_FILE"
fi

if [ -n "${2-}" ]; then
    NEW_VERSION="$2"
else
    echo
    echo "--- Changes since $CURRENT_VERSION ----"
    cat "$CHANGE_CHUNK_FILE"
    echo
    read -p "Update version to: " NEW_VERSION
fi

# strip leading v from input
if [ "${NEW_VERSION:0:1}" = "v" ]; then
    NEW_VERSION="${NEW_VERSION:1}"
fi

echo "updating from $CURRENT_VERSION => $NEW_VERSION"

# update package.version field
sed -i.bak -E "s/^version ?= ?\"[^\"]+\"$/version = \"$NEW_VERSION\"/" "$CARGO_MANIFEST"

# update readme
[ -f "$README_FILE" ] && sed -i.bak -E "s#$CURRENT_VERSION([/)])#$NEW_VERSION\1#g" "$README_FILE"

if [ -n "${CHANGELOG_FILE-}" ]; then
    # update changelog file
    (
        sed '/Unreleased/ q' "$CHANGELOG_FILE"                   # up to unreleased heading
        echo                                                     # blank line
        echo "## $NEW_VERSION"                                   # new version heading
        cat "$CHANGE_CHUNK_FILE"                                 # previously unreleased changes
        sed "/$CURRENT_VERSION/ q" "$CHANGELOG_FILE" | tail -n 1 # the previous version heading
        sed "1,/$CURRENT_VERSION/ d" "$CHANGELOG_FILE"           # everything after previous version heading
    ) >"$CHANGELOG_FILE.bak"
    mv "$CHANGELOG_FILE.bak" "$CHANGELOG_FILE"

    # format CHANGELOG file according to prettier
    npx -y prettier --write "$CHANGELOG_FILE" || true
fi

# done; remove backup files
rm -f $CARGO_MANIFEST.bak
rm -f $README_FILE.bak

if [ -n "${CHANGELOG_FILE-}" ]; then
    rm -f $CHANGELOG_FILE.bak
fi

echo "manifest, changelog, and readme updated"
echo
echo "check other references:"
rg --glob='**/{Cargo.toml,README.md}' "\
${PACKAGE_NAME} ?= ?\"[^\"]+\"\
|${PACKAGE_NAME} ?=.*version ?= ?\"([^\"]+)\"\
|package ?= ?\"${PACKAGE_NAME}\".*version ?= ?\"([^\"]+)\"\
|version ?= ?\"([^\"]+)\".*package ?= ?\"${PACKAGE_NAME}\"" || true

echo
read -p "Update all references: (y/N) " UPDATE_REFERENCES
UPDATE_REFERENCES="${UPDATE_REFERENCES:-n}"

if [ "$UPDATE_REFERENCES" = 'y' ] || [ "$UPDATE_REFERENCES" = 'Y' ]; then

    for f in $(fd Cargo.toml); do
        sed -i.bak -E \
            "s/^(${PACKAGE_NAME} ?= ?\")[^\"]+(\")$/\1${NEW_VERSION}\2/g" $f
        sed -i.bak -E \
            "s/^(${PACKAGE_NAME} ?=.*version ?= ?\")[^\"]+(\".*)$/\1${NEW_VERSION}\2/g" $f
        sed -i.bak -E \
            "s/^(.*package ?= ?\"${PACKAGE_NAME}\".*version ?= ?\")[^\"]+(\".*)$/\1${NEW_VERSION}\2/g" $f
        sed -i.bak -E \
            "s/^(.*version ?= ?\")[^\"]+(\".*package ?= ?\"${PACKAGE_NAME}\".*)$/\1${NEW_VERSION}\2/g" $f

        # remove backup file
        rm -f $f.bak
    done

fi

if [ $MACOS ]; then
    printf "chore($PACKAGE_NAME): prepare release $NEW_VERSION" | pbcopy
    echo "placed the recommended commit message on the clipboard"
else
    echo
    echo "commit message:"
    echo "chore($PACKAGE_NAME): prepare release $NEW_VERSION"
fi

SHORT_PACKAGE_NAME="$(echo $PACKAGE_NAME | sed 's/^actix-web-//' | sed 's/^actix-//')"
GIT_TAG="$(echo $SHORT_PACKAGE_NAME-v$NEW_VERSION)"
RELEASE_TITLE="$(echo $PACKAGE_NAME: v$NEW_VERSION)"

if [ "$(echo $NEW_VERSION | grep beta)" ] || [ "$(echo $NEW_VERSION | grep rc)" ] || [ "$(echo $NEW_VERSION | grep alpha)" ]; then
    FLAGS="--prerelease"
else
    FLAGS="--latest"
fi

echo
echo "GitHub release command:"
GH_CMD="gh release create \"$GIT_TAG\" --draft --title \"$RELEASE_TITLE\" --notes-file \"$CHANGE_CHUNK_FILE\" ${FLAGS:-}"
echo "$GH_CMD"

read -p "Submit draft GH release: (y/N) " GH_RELEASE
GH_RELEASE="${GH_RELEASE:-n}"

if [ "$GH_RELEASE" = 'y' ] || [ "$GH_RELEASE" = 'Y' ]; then
    eval "$GH_CMD"
fi

echo