#!/bin/sh
# Automatically git commits, pushes and pulls if doable in the taskwarrior data directory
#
# Much of this taken from: https://github.com/mrschyte/taskwarrior-hooks/
# with much gratitude
#
# The minimum amount of time required between 2 commits in seconds.
# So only if the last commit is at least x seconds old will a new one
# be created. Set to 0 to sync each taskwarrior change.
MINIMUM_WAIT_TIME=60

# Do not display status information.
QUIET=true

# Removes the tasks.json file after each run, keeping the
# task directory clean.
REMOVE_JSON=false

# Sort with `jq` commandline program if it is found.
# Also drops extra values 'urgency' and 'id' which are not
# necessary for backups and automatically calculated by tw.
STABLE_JSON=true

if [ "${DISABLE_HOOKS}" = "true" ] || ! command -v git >/dev/null 2>&1; then
    exit 0
fi

if [ "$1" != "api:2" ]; then
    printf "Taskwarrior uses different data API version than git plugin. Aborting!" 1>&2
    exit 1
fi

data_dir="$(echo "$5" | cut -f2 -d:)"
command_run="$(echo "$3" | cut -f2 -d:)"

if [ "$command_run" = "synchronize" ]; then
    DISABLE_HOOKS=true env task sync

    git -C "$data_dir" pull >/dev/null 2>&1
    pull_ret="$?"
    git -C "$data_dir" push >/dev/null 2>&1
    push_ret="$?"
    if [ "$pull_ret" -eq 0 ] && [ "$push_ret" -eq 0 ]; then
        [ $QUIET = "true" ] || echo "Git upstream synchronized."
    fi
fi

last_commit=$(git -C "$data_dir" log -1 --format="%at")
# if now is not yet greater than last commit + wait time do nothing
if [ "$(date "+%s")" -lt $((last_commit + MINIMUM_WAIT_TIME)) ]; then
    # TODO: Implement DEBUG msg level (info/debug) system
    # echo "Too early to check for changes, exiting."
    exit 0
fi

# echo "EXPORTING TASKS"
if [ "$STABLE_JSON" = true ] && command -v jq >/dev/null 2>&1; then
    DISABLE_HOOKS=true env task export | jq -S 'map(del(.id, .urgency)) | sort_by(.entry, .modified) | reverse' >"$data_dir/tasks.json"
else
    DISABLE_HOOKS=true env task export >"$data_dir/tasks.json"
fi

# after any command, if there's changes add and commit
if ! git -C "$data_dir" diff --exit-code >/dev/null 2>&1; then
    # echo "found changes"
    # need to run to fully update tasks that just got done
    DISABLE_HOOKS=true env task next >/dev/null 2>&1

    header="auto: ${2##* }"
    msg="full command: $2"
    git -C "$data_dir" commit "$data_dir/tasks.json" -m "$header" -m "$msg" --no-gpg-sign >/dev/null 2>&1
    [ $QUIET = "true" ] || echo "Backup up to git."
fi

if [ "$REMOVE_JSON" = true ] && [ -f "$data_dir/tasks.json" ]; then
    rm "$data_dir/tasks.json" >/dev/null 2>&1
fi