#!/bin/bash

# Error message for BRANCH POLICY
error_msg_branch=$(cat <<-END

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@                                                                               @
@   !!! Push not allowed by BRANCH NAME policy !!!                              @
@                                                                               @
@   You branch should be named with these templates:                            @
@     - master                                                                  @
@     - main                                                                    @
@     - feature/EVA_ID-000--*                                                   @
@     - bugfix/*                                                                @
@     - hotfix/*                                                                @
@                                                                               @
@   Example: feature/DO-167--add_new_functionality                             @
@                                                                               @
@   Wiki: https://eva.avroid.tech/project/Document/DOC-000518                   @
@                                                                               @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

END
)

error_msg_commit=$(cat <<-END

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@                                                                                 @
@   !!! Your Commit does not have a referance to Eva ticket !!!                   @
@                                                                                 @
@   Please correct your Git messages, and push again.                             @
@   Example: "[DO-1234] This is a correct Eva reference"                          @
@                                                                                 @
@   Wiki: https://eva.avroid.tech/project/Document/DOC-000518                     @
@                                                                                 @
@   To FORCE push, use "bugfix" or "hotfix" in your commit message                @
@                                                                                 @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

END
)

while read oldrev newrev refname
do
  #
  # Step 1:
  # Get Git commit information
  #
  BRANCH_NAME_FULL=$refname
  BRANCH_NAME="$(echo $BRANCH_NAME_FULL | sed 's/refs\/heads\///g')"
  COMMIT_MESSAGE=$(git log --format=%B -n 1)
  echo "[INFO] BRANCH NAME: $BRANCH_NAME"


  #
  # Step 2:
  # Policy - Check that brunch name is enforced by branch name
  #
  echo "[INFO] Policy - Check that brunch name is enforced by branch name"
  # Regexp for allowed names of branches
  branch_name_format='^master|^main|^feature\/[a-zA-Z0-9,\.\_\-]+-[0-9]+.*|^hotfix\/.*|^bugfix\/.*'

  if [[ ! $BRANCH_NAME =~ $branch_name_format ]]; then
      echo "$error_msg_branch" >&2
      exit 1
  else
      echo "Push is successful"
  fi


  #
  # Step 3:
  # Policy - Check commit message for Eva issue number
  #

  # Configuration
  echo "[INFO] Policy - Check commit message for Eva issue number"
  issueIdRegex="[a-zA-Z0-9,\.\_\-]+-[0-9]+"
  fixMsgRegex="bugfix|hotfix"
  info_msg="[INFO] The commit message looks good"
  error_msg="[POLICY] The commit doesn't reference a Eva issue"

  # Get all commits from this push
  for sha1Commit in $(git rev-list $oldrev..$newrev);
  do
    # Receive git commits sha from git history in chronologic order
    echo "[INFO] Processing commit with sha: $sha1Commit";
    # Get commit message from commit
    commitMessage=$(git log --format=%B -n 1 $sha1Commit)
    # Check with RegEX if commit has Eva reference
    issueIds=$(echo $commitMessage | grep -Eo $issueIdRegex)
    fixMsg=$(echo $commitMessage | grep -Eo $fixMsgRegex)
    # Check if this commit urgent e.g. hotfox or bugfix
    if [[ -n "${fixMsg}" ]]; then
      echo "[WARNING] Found "bugfix|hotfix" in msg. Force skipping check for EvaID"
      exit 0
    fi
    # Check for issueIDs in commit message
    echo "[INFO] Found Eva IDs in commit: $issueIds"
    if [[ -z "${issueIds}" ]]; then
      echo "$error_msg: $commitMessage" >&2
      echo "$error_msg_commit" >&2
      exit 1
    fi
  done
done

#
# Exit
#
exit 0