#!/usr/bin/env zsh
autoload -U colors
colors

set -eu -o pipefail

function define() {
  IFS='\n' read -r -d '' ${1} || true;
}

local commit_template_fn="$(mktemp)"
TRAPEXIT() {
  rm "$commit_template_fn"
}

function git-issue-start() {
  >"$commit_template_fn" <<"EOF"
issue: 

# issue body
EOF

  git stash
  TRAPEXIT() {
    git stash pop
  }
  git commit --allow-empty -t "$commit_template_fn"
}

git-issue-sum() {
  git log --format=format:"%h: %s" --grep issue:
}
alias git-issue-list=git-issue-sum
alias git-issue-summary=git-issue-sum


function git-issue-summarize() {
  git show -s --format=format:"%h: %s" "${1?need a ref}" --
  echo
}

git-issue-normalize-ref () {
  git show -s --format=format:"%h" ${1?need a ref} --
}

git-issue-closed-commits() {
  git log --format=format:"%h:%s" --grep close | sed -E 's/^.*:close\(([^)]+)\):.*$/\1/' | sort
}
git-issue-aborted-commits() {
  git log --format=format:"%h:%s" --grep abort | sed -E 's/^.*:abort\(([^)]+)\):.*$/\1/' | sort
}
git-issue-issue-commits() {
  git log --format=format:"%h" --grep issue: | sort
}

git-issue-open() {
  comm -23 <( ( git-issue-issue-commits ) ) <( ( git-issue-closed-commits ) ) | {
    while read -r; do
      git-issue-summarize "$REPLY"
    done
  }
}

git-issue-closed() {
  git-issue-closed-commits | {
    while read -r; do
      git-issue-summarize "$REPLY"
    done
  }
}

git-issue-aborted() {
  git-issue-aborted-commits | {
    while read -r; do
      git-issue-summarize "$REPLY"
    done
  }
}

git-issue-progress() {
  : ${1?need a ref}
  issue="$(git-issue-normalize-ref "$1")"

  git-issue-show "$issue"
  echo

  git log \
    --format=format:$'%h: %s\n' \
    --grep "$(git-issue-normalize-ref "${issue}")" |
    gtac
}

in-progress() {
  : ${1?need a ref}
  issue="$(git-issue-normalize-ref "$1")"

  git log \
    --format=format:$'%h: %s\n' \
    --grep "$(git-issue-normalize-ref "${issue}")" |
    grep -v "close($issue)"
}

git-issue-ip() {
  in-progress "$@"
}

function git-issue-all() {
  {
    git-issue-open | {
      while read -r; do 
        if in-progress "${REPLY%%:*}" >/dev/null; then
          printf "${fg[yellow]}PROGRESS${reset_color}\t$REPLY\n";
        else
          printf "${fg[green]}OPEN${reset_color}\t$REPLY\n";
        fi
      done 
    } | sort -r
    git-issue-closed | {
      while read -r; do
        printf "${fg[red]}CLOSED${reset_color}\t$REPLY\n";
      done 
    }
    git-issue-aborted | {
      while read -r; do
        printf "${fg[red]}ABORTED${reset_color}\t$REPLY\n";
      done 
    }
  } | column -t -s $'\t'
}

git-issue-show() {
  git show --format=full "$1" --
}

git-issue-show-brief() {
  git show --format=format:"%h: %s" "$1" --
}

git-issue-close() {
  issue="$(git-issue-normalize-ref "${1?must provide an issue hash to close}")"

  if ! git-issue-show "$issue" &>/dev/null; then
    echo "invalid issue '$issue' provided" >&2
    return
  fi

  >"$commit_template_fn" <<EOF
abort($issue): 
EOF

  git commit --allow-empty -t "$commit_template_fn"
}

git-issue-abort() {
  issue="$(git-issue-normalize-ref "${1?must provide an issue hash to close}")"

  if ! git-issue-show "$issue" &>/dev/null; then
    echo "invalid issue '$issue' provided" >&2
    return
  fi

  >"$commit_template_fn" <<EOF
abort($issue): 
EOF

  git commit --allow-empty -t "$commit_template_fn"
}

local subcmd=$1
shift

"git-issue-$subcmd" "$@"