#!/usr/bin/env bash

function show_usage {
  echo
  echo "Usage: $0 <src>"
  echo
  echo "Paramètres: "
  echo
  echo "  - <src> Chemin vers le répertoire des sources du projet. Le projet doit être un dépôt Git valide."
  echo
}

function main {

  cd "$SRC_DIR"

  if [ ! -d '.git' ]; then
    fatal "The directory $SRC_DIR seems not to be a valid Git repository."
  fi

  MANIFEST=$(cat tamarin.json 2>/dev/null)

  if [ -z "$MANIFEST" ]; then
    MANIFEST="{}"
  fi

  # Extract project info from Git
  repo_name=$(basename `git rev-parse --show-toplevel`)
  current_commit=$(git log -n 1 --pretty=format:"%h")
  # Get commits log as changelog
  logs=$(git log --pretty=format:"%an - %h : %s" | sed 's/"/\\"/g')
  # Set the top commiter as the maintainer of the project
  git_maintainer=$(git log --pretty=short | git shortlog -s -n -e | sed 's/^\s*[0-9]*\s*//g' | head -n 1)

  # Get current version from manifest
  current_name=$(echo "$MANIFEST" | jq -r ".name"  | sed 's/null//')
  current_version=$(echo "$MANIFEST" | jq -r ".version"  | sed 's/null//')
  current_changelog=$(echo "$MANIFEST" | jq -r ".changelog"  | sed 's/null//')
  current_maintainer=$(echo "$MANIFEST" | jq -r ".maintainer"  | sed 's/null//')

  # Complete manifest

  # Add commit number to version
  MANIFEST=$(echo "$MANIFEST" | jq -r ".version = \"${current_version:-0.0.0}~$current_commit\"")
  # Set name if not defined
  MANIFEST=$(echo "$MANIFEST" |  jq -r ".name = \"${current_name:-$repo_name}\"")
  # Set maintainer if not defined
  MANIFEST=$(echo "$MANIFEST" |  jq -r ".maintainer = \"${current_maintainer:-$git_maintainer}\"")

  # Set changelog from git log if not defined
  if [ -z "$current_changelog" ]; then

    MANIFEST=$(echo "$MANIFEST" | jq -r ".changelog = []")

    while read -r entry; do
      MANIFEST=$(echo "$MANIFEST" | jq -r ".changelog += [\"$entry\"]")
    done <<< "$logs"

  fi

  echo "$MANIFEST"

}

# Load util lib
DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
source "$DIR/lib/util.sh"

# Test for arguments
if [ -z "$1" ]; then
  show_usage
  exit 1
fi

SRC_DIR=$(readlink -f "$1")

main