#!/bin/bash

set -o errexit
set -o nounset
set -o pipefail
set -o xtrace # Uncomment this line for debugging purpose

TARGET_DIR="."

# App and repo that will be used as base
BASE_REPO="https://github.com/bitnami/bitnami-docker-wordpress"

function joinStrings() { 
    local a=("${@:3}")
    printf "%s" "$2${a[@]/#/$1}"
}

function moveFilesExcluding() {
    local -r dest="${1:?Missing destination directory}"
    shift
    local -r excludeFiles=("$@")
echo "Files to exclude: ${excludeFiles[@]}" 
    mkdir -p "$dest"   

    local -r f_exclude_flags=($(joinStrings ' -and ! -name ' "${excludeFiles[@]}")) 
echo "${f_exclude_flags[@]}"
    find . -depth 1 ! -name "${f_exclude_flags[@]}" | while read -r file; do
        cp -a "$file" "${dest}/"
        rm -Rf "$file"
    done    
}

function queryRepos() {
    local page=0
    local repos="[]" # Initial empty JSON array
    local -r repos_per_page="100"

    while [[ "$page" -gt -1 ]]; do
        # Query only the public repos since we won't add private containers to bitnami/containers
        page_repos="$(curl -H 'Content-Type: application/json' -H 'Accept: application/json' "https://api.github.com/orgs/bitnami/repos?type=public&per_page=${repos_per_page}&page=${page}")"
        repos="$(jq -s 'reduce .[] as $x ([]; . + $x)' <(echo "$repos") <(echo "$page_repos"))"     
        n_repos="$(jq length <<< "$page_repos")"   
        if [[ "$n_repos" -lt "$repos_per_page" ]]; then
          page="-1"
        else
          page="$((page + 1))" 
        fi
    done

    echo "$repos"
}

function getContainerRepos() {
    local -r repos="$(queryRepos)"
    local -r container_repos="$(jq -r '[ .[] | select(.name | test("bitnami-docker-.")) ]' <<< "$repos")"
    echo "$container_repos" > /tmp/repos
    echo "$container_repos"
}

# Commits a directory
function commitChanges() { 
    git config user.name "Bitnami Containers"
    git config user.email "containers@bitnami.com"
    
    git diff --exit-code || (git add -A && git commit -m "Sync ${name} files")
}

function pushChanges() {
    git config user.name "Bitnami Containers"
    git config user.email "containers@bitnami.com"
    git push
}

function mergeRepos() {
    local -r repos="$(getContainerRepos)"
    # Files that should not be moved
    local -r static_files=(. .git containers)
    # Files that will checkout bitnami/containers main branch on every sync
    local -r special_files=(CONTRIBUTING.md CODE_OF_CONDUCT.md LICENSE.md .github scripts)
    
    mkdir -p "$TARGET_DIR"
   
    # Build array of app names since we need to exclude them when moving files
    local apps=("mock")
    local -r urls=($(echo "$repos" | jq -r '.[].html_url'))
    for repo_url in "${urls[@]}"; do
        name="${repo_url:42}" # 42 is the length of https://github.com/bitnami/bitnami-docker-
        apps=("${apps[@]}" "$name")
    done
    echo "$repos" | jq -r '.[].html_url' | while read -r repo_url; do
        name="${repo_url:42}" # 42 is the length of https://github.com/bitnami/bitnami-docker-
        (
            cd "$TARGET_DIR"
            mkdir -p "containers/${name}" # Create directory for the app
            # Back up the README.md to avoid getting merge conflicts
            #mv README.md README.md.back
            # clone the repositoy outside of this one
            git clone "$repo_url" ../temporal/"$name"
            (
                cd ../temporal/"$name"
                mkdir -p containers/"$name"
                git-filter-repo --to-subdirectory-filter containers/"$name" --force
            )
            # Fetch the old repo and merge maintaining history
            git remote add --fetch "$name" "../temporal/${name}"
            git merge "${name}/master" --allow-unrelated-histories --no-log --no-ff -Xtheirs #--no-commit
            #git checkout main "${special_files[@]}"
            git remote remove "$name"
            rm -Rf ../temporal/"$name"
            # Move the content to the app directory
            # moveFilesExcluding "containers/${name}" "${static_files[@]}" "README.md.back" "${special_files[@]}" "${apps[@]}"
            # Recover README.md
            #mv README.md.back README.md
            #commitChanges
exit 0
        )
    done

    pushChanges
}

mergeRepos