#!/bin/bash

#
## Installation of self hosted git service Gitea

toolName="gitea"
giteaLatestUrl="https://api.github.com/repos/go-gitea/gitea/releases/latest"
giteaVersion=$(curl --silent "$giteaLatestUrl" | grep -Po '"tag_name": "v\K.*?(?=")')
giteaDownload="https://dl.gitea.io/gitea/${giteaVersion}/gitea-${giteaVersion}-linux-arm-6"
giteaDir="/usr/local/bin"
giteaLoc="${giteaDir}/gitea"
giteaService="https://raw.githubusercontent.com/go-gitea/gitea/master/contrib/systemd/gitea.service"
giteaServiceLoc="/etc/systemd/system/gitea.service"

step_config() {
  if [ -z $giteaVersion ] ; then
    echoerr " [E] Couldn't determine latest version of $toolName"
  fi
}

step_1_info() { echo "Updating apt"; }
step_1() {
  exe apt update
}

step_2_info() { echo "Downloading $toolName to user home: $giteaDownload"; }
step_2() {
  exe wget -O ~/gitea $giteaDownload
  saveReturn $?
  endReturn 
}

step_3_info() { echo "Adding user for $toolName (git:git)"; }
step_3() {
  exe adduser \
    --system \
    --shell /bin/bash \
    --gecos 'Git Version Control' \
    --group \
    --disabled-password \
    --home /home/git \
    git
  saveReturn $?
  endReturn 
}

step_4_info() { echo "Create required directory structure"; }
step_4() {
  exe mkdir -p /var/lib/gitea/{custom,data,log}
  exe chown -R git: /var/lib/gitea/
  exe chmod -R 750 /var/lib/gitea/
  exe mkdir /etc/gitea
  exe chown root:git /etc/gitea
  exe chmod 770 /etc/gitea
  echo -n "Copying gitea to global location and making it executable..."
  exe chmod +x ~/gitea 
  exe cp -ar ~/gitea "$giteaLoc" && echo "ok"
  saveReturn $?
  endReturn 
}

step_5_info() { echo "Creating systemd service"; }
step_5() {
  exe wget -O "$giteaServiceLoc" "$giteaService"
  echo -en "Uncomment needed services mysql (enter to continue): "
  exe read
  exe vi $giteaServiceLoc
}

step_6_info() { echo -e "Starting $toolName service\n"; }
step_6() {
  exe systemctl enable gitea
  exe systemctl start gitea
  echo "Before proceeding to installation you may need to create a database first with step 10"
  echo
  echo "Goto http://[yourip]:3000/install and complete installation"
  echo
  echo "Afterwards please execute step 20 to secure configuration"
}

step_7_info() { echo "Show configuration notes"; }
step_7_alias() { ALIAS="config"; }
step_7() {
  echo -e "Final configuration notes for app.ini:\n\n"
  echo "$CONFIG_NOTES"
}

CONFIG_NOTES="\
  [repository]
DEFAULT_CLOSE_ISSUES_VIA_COMMITS_IN_ANY_BRANCH = true

[server]
# Don't show home page
LANDING_PAGE = explore

[mailer]
# Allow local MTA without valid certificate
SKIP_VERIFY = true

[service]
# Use correct user identity when changing files in the web frontend
NO_REPLY_ADDRESS = yourdomain.com

[attachment]
# Allow more archives to be uploaded
ALLOWED_TYPES=application/zip|application/gzip|application/x-zip|application/x-gzip|application/x-shellscript|text/markdown"

step_10_info() { echo -e "Create mysql database for $toolName\n"; }
step_10() {
  local mysqlDatabase
  local mysqlUser
  local mysqlPass

  echo "Existing mysql databases:"
  exe mysql -u root -e 'SHOW DATABASES;'

  echo -en "Enter database name: " 
  read mysqlDatabase
  endCheckEmpty mysqlDatabase "database name"
  exe mysql -u root -e 'CREATE DATABASE '$mysqlDatabase' CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;'
  saveReturn $?
  endReturn 

  echo "Existing mysql user:"
  exe mysql -u root -e 'SELECT User, Host FROM mysql.user;' 
  echo -en "Enter mysql user name: " 
  read mysqlUser
  endCheckEmpty mysqlUser "user name"

  echo -en "Enter mysql user password: " 
  read mysqlPass
  endCheckEmpty mysqlPass "password"
  exe mysql -u root -e 'CREATE USER '"'"$mysqlUser"'"'@'"'"'localhost'"'"' IDENTIFIED BY '"'"$mysqlPass"'"';'
  saveReturn $?
  endReturn 

  exe mysql -u root -e 'GRANT ALL PRIVILEGES ON '$mysqlDatabase'.* TO '"'"$mysqlUser"'"'@'"'"'localhost'"'"';'
  saveReturn $?
  endReturn 

  exe mysql -u root -e 'FLUSH PRIVILEGES;'
}

step_12_info() { echo "Download new version $giteaVersion to /usr/local/bin"; }
step_12_alias() { ALIAS="upgrade"; }
step_12() {
  if [ -f "$giteaLoc" ] ; then
    local versionNow=$(gitea --version | sed 's/.*version \([0-9.]\+\).*/\1/')
    local toolBackup="${giteaDir}/gitea_${versionNow}"
    exe service gitea stop
    saveReturn $?
    endReturn
    echo -n "Backuping up existing executable to ${toolBackup}..."
    exe cp -ar "$giteaLoc" "$toolBackup" && echo "ok"
  fi
  exe wget -O "$giteaLoc" $giteaDownload
  exe chmod +x "$giteaLoc" 
  exe service gitea start
}

step_20_info() { echo "Secure settings after installation"; }
step_20() {
  exe chmod 750 /etc/gitea
  exe chmod 644 /etc/gitea/app.ini
}

# Sequence Revision
VERSION_SEQREV=10

# Path to sequencer
. /usr/local/bin/sequencer.sh