#!/bin/bash

# Set script to exit immediately on any error
set -e

# For the file paths to work correctly, call this script with this command from the cloned repo folder root:
# sh automation_tools/pre_build_automation.sh
# Different actions need different information in the task list file
# branch: This changes the placeholder text to the currently-detected GIT branch if an automated build was started from a PR environment.
# hash: Finds the SHA256 hash of a file online and updates the placeholder in the manifest.
#     Needs the URL of the file, in this line format: hash^PLACEHOLDERTEXT^url
# latestcommit: Finds the most recent commit of a git repo and updates the placeholder in the manifest.
#     Needs the URL of the repo and the branch to find the latest commit from, in this line format: latestcommit^PLACEHOLDERTEXT^url^branch
# latestghtag: Finds the most recent tag on a GitHub repo, for repos that don't have normal releases, but also shouldn't use the latest commit
#     Needs the URL of the repo, in this line format: latestghtag^PLACEHOLDERTEXT^url
# latestghrelease: Finds the download URL and SHA256 hash of the latest release from a git repo.
#     Needs the API URL of the repo, in this line format: latestghrelease^PLACEHOLDERTEXT^https://api.github.com/repos/<owner-name>/<repo-name>/releases/latest^<file suffix>
#     As this command updates two different placeholders (one for the URL, one for the file hash) in the manifest,
#     the URL that would be used in the above example is "PLACEHOLDERTEXT" and the hash placeholder text would be "HASHPLACEHOLDERTEXT"
#     The "HASH" prefix of the hash placeholder text is hardcoded in the script.
#     The <file_suffix> will be the file extension or other identifying suffix at the end of the file name that can be used to select from multiple releases.
#     Example: If there are these file options for a given release:
#     yuzu-mainline-20240205-149629642.AppImage
#     yuzu-linux-20240205-149629642-source.tar.xz
#     yuzu-linux-20240205-149629642-debug.tar.xz
#     Entering "AppImage" (without quotes) for the <file_suffix> will identify yuzu-mainline-20240205-149629642.AppImage
#     Entering "source-.tar.xz" (without quotes) for the <file_suffix> will identify yuzu-linux-20240205-149629642-source.tar.xz
#     Entering "debug-tar.xz" (without quotes) for the <file_suffix> will identify yuzu-linux-20240205-149629642-debug.tar.xz
#     As a file extension like ".tar.xz" can apply to multiple file options, the entire part that is appended to each release name should be included.
#     The <file_suffix> will also only consider entries where the given suffix is at the end of the file name. So "AppImage" will identify "file.AppImage" but not "file.AppImage.zsync"
# latestghreleasesha: Finds the SHA256 hash of a specific asset in the latest release from a git repo.
#     Needs the API URL of the repo, in this line format: latestghreleasesha^PLACEHOLDERTEXT^https://api.github.com/repos/<owner-name>/<repo-name>/releases/latest^<file suffix>
#     This command updates the placeholder in the manifest with the SHA256 hash of the specified asset.
# outside_file: Prints the contents of a file from the build environment (such as the buildid file) and replaces the placeholder text with those contents.
# outside_env_var: Gets the value of an environmental variable from the build environment (the output of "echo $var" from the terminal) and replaces the placeholder text with that value.
# custom_command: Runs a single command explicitly as written in the $URL field of the task list, including variable and command expansion. This should work the same as if you were running the command directly from the terminal.
#     This command does not need a PLACEHOLDERTEXT field in the task list, so needs to be in this syntax: custom_command^^$COMMAND
# url: This is used to calculate a dynamic URL and the value to the $calculated_url environmental variable, for use in other subsequent commands.

# Define paths
rd_manifest="${GITHUB_WORKSPACE}/net.retrodeck.es-de"
automation_task_list="${GITHUB_WORKSPACE}/automation_tools/automation_task_list.cfg"

# Retrieve current git branch
get_current_branch() {
  local branch=$(git rev-parse --abbrev-ref HEAD)
  if [ "$branch" == "HEAD" ]; then
    echo "$GITHUB_REF" | sed 's@refs/heads/@@'
  else
    echo "$branch"
  fi
}

# Retrieve the repository URL
get_repo_url() {
  local repo_url=$(git config --get remote.origin.url)
  # Convert SSH URL to HTTPS if needed
  if [[ "$repo_url" == git@* ]]; then
    repo_url=$(echo "$repo_url" | sed -e 's|git@|https://|' -e 's|:|/|')
  fi
  echo "$repo_url"
}

current_branch=$(get_current_branch)
current_repo_url=$(get_repo_url)

echo "Manifest location: $rd_manifest"
echo "Automation task list location: $automation_task_list"
echo
echo "Task list contents:"
cat "$automation_task_list"
echo

# Functions to handle different actions
handle_branch() {
  local placeholder="$1"
  echo "Replacing placeholder $placeholder with branch $current_branch"
  /bin/sed -i 's^'"$placeholder"'^'"$current_branch"'^g' "$rd_manifest"
}

handle_hash() {
  local placeholder="$1"
  local url="$2"
  local calculated_url=$(eval echo "$url")
  local hash=$(curl -sL "$calculated_url" | sha256sum | cut -d ' ' -f1)
  echo "Replacing placeholder $placeholder with hash $hash"
  /bin/sed -i 's^'"$placeholder"'^'"$hash"'^g' "$rd_manifest"
}

handle_latestcommit() {
  local placeholder="$1"
  local url="$2"
  local branch="$3"
  local commit=$(git ls-remote "$url" "$branch" | cut -f1)
  echo "Replacing placeholder $placeholder with latest commit $commit"
  /bin/sed -i 's^'"$placeholder"'^'"$commit"'^g' "$rd_manifest"
}

handle_latestghtag() {
  local placeholder="$1"
  local url="$2"
  local tag=$(git ls-remote --tags "$url" | tail -n 1 | cut -f2 | sed 's|refs/tags/||')
  echo "Replacing placeholder $placeholder with latest tag $tag"
  /bin/sed -i 's^'"$placeholder"'^'"$tag"'^g' "$rd_manifest"
}

handle_latestghrelease() {
  local placeholder="$1"
  local api_url="$2"
  local pattern="$3"
  echo "Fetching release data from: $api_url"

  # Fetch the release data from GitHub API
  local release_data=$(curl -s "$api_url")
  echo "Release data fetched."

  # Find the matching asset using the pattern
  local ghreleaseurl=$(echo "$release_data" | jq -r ".assets[] | select(.name | test(\"$pattern\")).browser_download_url")

  if [[ -z "$ghreleaseurl" ]]; then
    echo "Error: No asset found matching pattern $pattern"
    exit 1
  fi

  # Download the file and compute its hash
  local ghreleasehash=$(curl -sL "$ghreleaseurl" | sha256sum | cut -d ' ' -f1)

  echo "Replacing placeholder $placeholder with URL $ghreleaseurl and hash $ghreleasehash"
  /bin/sed -i 's^'"$placeholder"'^'"$ghreleaseurl"'^g' "$rd_manifest"
  /bin/sed -i 's^'"HASHFOR$placeholder"'^'"$ghreleasehash"'^g' "$rd_manifest"
}

handle_latestghreleasesha() {
  local placeholder="$1"
  local api_url="$2"
  local pattern="$3"
  echo "Fetching release data from: $api_url"
  
  # Fetch the release data from GitHub API
  local release_data=$(curl -s "$api_url")
  echo "Release data fetched."

  # Find the matching asset using the pattern
  local ghreleaseurl=$(echo "$release_data" | jq -r ".assets[] | select(.name | test(\"$pattern\")).browser_download_url")

  if [[ -z "$ghreleaseurl" ]]; then
    echo "Error: No asset found matching pattern $pattern"
    exit 1
  fi

  # Download the file and compute its hash
  echo "Downloading asset to compute hash: $ghreleaseurl"
  local ghreleasehash=$(curl -sL "$ghreleaseurl" | sha256sum | cut -d ' ' -f1)

  echo "Replacing placeholder $placeholder with hash $ghreleasehash"
  /bin/sed -i 's^'"$placeholder"'^'"$ghreleasehash"'^g' "$rd_manifest"
}

handle_outside_file() {
  local placeholder="$1"
  local file_path="$2"
  if [[ "$file_path" == \$* ]]; then
    eval file_path="$file_path"
  fi
  local content=$(cat "$file_path")
  echo "Replacing placeholder $placeholder with content of file $file_path"
  /bin/sed -i 's^'"$placeholder"'^'"$content"'^g' "$rd_manifest"
}

handle_outside_env_var() {
  local placeholder="$1"
  local var_name="$2"
  if [[ "$var_name" == \$* ]]; then
    eval var_name="$var_name"
  fi
  local value=$(echo "$var_name")
  echo "Replacing placeholder $placeholder with environment variable $value"
  /bin/sed -i 's^'"$placeholder"'^'"$value"'^g' "$rd_manifest"
}

handle_custom_command() {
  local command="$1"
  echo "Executing custom command: $command"
  eval "$command"
}

handle_url() {
  local placeholder="$1"
  local url="$2"
  local calculated_url=$(eval echo "$url")
  echo "Replacing placeholder $placeholder with calculated URL $calculated_url"
  /bin/sed -i 's^'"$placeholder"'^'"$calculated_url"'^g' "$rd_manifest"
}

# Handle the THISREPO placeholder
handle_thisrepo() {
  local placeholder="$1"
  echo "Replacing placeholder $placeholder with repository URL $current_repo_url"
  /bin/sed -i 's^'"$placeholder"'^'"$current_repo_url"'^g' "$rd_manifest"
}

# New function to handle the latest artifact from GitHub Actions
handle_latestghaartifact() {
  local placeholder_url="$1"
  local placeholder_hash="$2"
  local workflow_url="$3"
  local artifact_name="$4"

  echo "Fetching workflow runs from: $workflow_url"
  workflow_runs_url=$(echo "$workflow_url" | sed 's/github.com/api.github.com\/repos/' | sed 's/actions\/workflows\/[^\/]*$/actions\/runs/')

  local runs_data=$(curl -s "$workflow_runs_url")
  local latest_run_url=$(echo "$runs_data" | jq -r ".workflow_runs[0].artifacts_url")

  if [[ -z "$latest_run_url" ]]; then
    echo "Error: No workflow runs found"
    exit 1
  fi

  echo "Fetching artifacts from the latest run: $latest_run_url"
  local artifacts_data=$(curl -s "$latest_run_url")
  local artifact_url=$(echo "$artifacts_data" | jq -r ".artifacts[] | select(.name == \"$artifact_name\").archive_download_url")

  if [[ -z "$artifact_url" ]]; then
    echo "Error: No artifact found with name $artifact_name"
    exit 1
  fi

  echo "Downloading the artifact to calculate the hash..."
  local artifact_hash=$(curl -sL "$artifact_url" | sha256sum | cut -d ' ' -f1)

  echo "Replacing placeholder $placeholder_url with artifact URL $artifact_url"
  echo "Replacing placeholder $placeholder_hash with artifact hash $artifact_hash"
  /bin/sed -i 's^'"$placeholder_url"'^'"$artifact_url"'^g' "$rd_manifest"
  /bin/sed -i 's^'"$placeholder_hash"'^'"$artifact_hash"'^g' "$rd_manifest"
}

# Process the task list
while IFS="^" read -r action placeholder url branch artifact_name || [[ -n "$action" ]]; do
  if [[ ! "$action" == "#"* ]] && [[ -n "$action" ]]; then
    case "$action" in
      "branch" ) handle_branch "$placeholder" ;;
      "hash" ) handle_hash "$placeholder" "$url" ;;
      "latestcommit" ) handle_latestcommit "$placeholder" "$url" "$branch" ;;
      "latestghtag" ) handle_latestghtag "$placeholder" "$url" ;;
      "latestghrelease" ) handle_latestghrelease "$placeholder" "$url" "$branch" ;;
      "latestghreleasesha" ) handle_latestghreleasesha "$placeholder" "$url" "$branch" ;;
      "outside_file" ) handle_outside_file "$placeholder" "$url" ;;
      "outside_env_var" ) handle_outside_env_var "$placeholder" "$url" ;;
      "custom_command" ) handle_custom_command "$url" ;;
      "url" ) handle_url "$placeholder" "$url" ;;
      "THISREPO" ) handle_thisrepo "$placeholder" ;;
      "latestghaartifact" ) handle_latestghaartifact "$placeholder" "$branch" "$url" "$artifact_name" ;;
    esac
  fi
done < "$automation_task_list"