#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#
#  Author: Hari Sekhon
#  Date: 2020-02-07 15:01:31 +0000 (Fri, 07 Feb 2020)
#
#  https://github.com/harisekhon/bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/harisekhon
#

set -euo pipefail
[ -n "${DEBUG:-}" ] && set -x
srcdir="$(dirname "$0")"

# shellcheck disable=SC1090
. "$srcdir/lib/utils.sh"

top_N=100

# shellcheck disable=SC2034,SC2154
usage_description="
Script to generate GIT_STATUS.md containing the headers and status badges of the Top N rated by stars GitHub repos across all CI platforms on a single page


# Examples:


    Without arguments queries for all non-fork repos for your $GITHUB_USER and iterate them up to $top_N to generate the page

        GITHUB_USER=HariSekhon ./github_generate_status_page.sh


    With arguments will query those repo's README.md at the top level - if omitting the prefix will prepend $GITHUB_USER/

        GITHUB_USER=HariSekhon ./github_generate_status_page.sh  HariSekhon/DevOps-Python-tools  HariSekhon/DevOps-Perl-tools

        GITHUB_USER=HariSekhon ./github_generate_status_page.sh  DevOps-Python-tools  DevOps-Perl-tools
"

# used by usage() in lib/utils.sh
# shellcheck disable=SC2034
usage_args="[<user/repo1> <user/repo2> ...]"

help_usage "$@"

trap 'echo ERROR >&2' exit

file="GIT_STATUS.md"

repolist="$*"

# this leads to confusion as it generates some randomly unexpected output by querying a github user who happens to have the same name as your local user eg. hari, so force explicit now
#USER="${GITHUB_USER:-${USERNAME:-${USER}}}"
if [ -z "${GITHUB_USER:-}" ] ; then
    echo "\$GITHUB_USER not set!"
    exit 1
fi

get_repos(){
    page=1
    while true; do
        echo "fetching GitHub repos - page $page" >&2
        if ! output="$("$srcdir/github_api.sh" "/users/$GITHUB_USER/repos?page=$page&per_page=100")"; then
            echo "ERROR" >&2
            exit 1
        fi
        # use authenticated requests if you are hitting the API rate limit - this is automatically done above now if USER/PASSWORD GITHUB_USER/GITHUB_PASSWORD/GITHUB_TOKEN environment variables are detected
        # eg. CURL_OPTS="-u harisekhon:$GITHUB_TOKEN" ...
        if [ -z "$(jq '.[]' <<< "$output")" ]; then
            break
        elif jq -r '.message' <<< "$output" >&2 2>/dev/null; then
            exit 1
        fi
        jq -r '.[] | select(.fork | not) | select(.private | not) | [.full_name, .stargazers_count, .forks] | @tsv' <<< "$output"
        ((page+=1))
    done
}

original_sources=0

if [ -z "$repolist" ]; then
    repolist="$(get_repos | grep -v spark-apps | sort -k2nr -k3nr | awk '{print $1}' | head -n "$top_N")"
    original_sources=1
fi

num_repos="$(wc -w <<< "$repolist")"
num_repos="${num_repos// /}"

#echo "$repolist" >&2

# make portable between linux and mac
head(){
    if [ "$(uname -s)" = Darwin ]; then
        # from brew's coreutils package (installed by 'make')
        ghead "$@"
    else
        command head "$@"
    fi
}

tempfile="$(mktemp)"
trap 'echo ERROR >&2; rm -f $tempfile' exit

{
actual_repos=0

total_stars=0
total_forks=0
echo "getting followers" >&2
followers="$("$srcdir/github_api.sh" /users/harisekhon | jq -r .followers)"

echo "---" >&2
for repo in $repolist; do
    if ! [[ "$repo" =~ / ]]; then
        repo="$GITHUB_USER/$repo"
    fi
    echo "fetching GitHub repo info for '$repo'" >&2
    repo_json="$("$srcdir/github_api.sh" "/repos/$repo")"
    description="$(jq -r .description <<< "$repo_json")"
    stars="$(jq -r .stargazers_count <<< "$repo_json")"
    forks="$(jq -r .forks <<< "$repo_json")"
    #watchers="$(jq -r .watchers <<< "$repo_json")"
    ((total_stars += stars))
    ((total_forks += forks))
    #((total_watchers += watchers))
    echo "fetching GitHub README.md for '$repo'" >&2
    echo "---"
    echo "---" >&2
    {
        #perl -e '$/ = undef; my $content=<STDIN>; $content =~ s/<!--[^>]+-->//gs; print $content' |
        curl -sS "https://raw.githubusercontent.com/$repo/master/README.md" |
        perl -pe '$/ = undef; s/<!--[^>]+-->//gs' |
        sed -n '1,/^[^\[[:space:]<=-]/ p' |
        head -n -1 |
        #perl -ne 'print unless /=============/;' |
        grep -v "===========" |
        sed '1 s/^[^#]/# &/'
    } |
    {
        read -r title
        printf '%s\n' "$title"
        echo
        printf '%s\n' "Link:  [$repo](https://github.com/$repo)"
        echo
        printf '%s\n' "$description"
        cat
    }
    # works for Link which is a limited format, but couldn't expect to safely inject a description line pulled from the GitHub API because all sorts of characters could be contained which break this, so instead doing this via the brace piping trick above
    # \\ escapes the newlines to allow them inside the sed for literal replacement since \n doesn't work
    #sed "2 s|^|\\
#\\
#Link:  [$repo](https://github.com/$repo)
#|"
    echo
    ((actual_repos+=1))
done
} > "$tempfile"

if [ "$num_repos" != "$actual_repos" ]; then
    echo "ERROR: differing number of target github repos ($num_repos) vs actual repos ($actual_repos)"
    exit 1
fi

hosted_build_regex='travis-ci.+\.svg'
hosted_build_regex+='|github\.com/.+/workflows/.+/badge\.svg'
hosted_build_regex+='|dev\.azure\.com/.+/_apis/build/status'
hosted_build_regex+='|app\.codeship\.com/projects/.+/status'
hosted_build_regex+='|appveyor\.com/api/projects/status'
hosted_build_regex+='|circleci\.com/.+\.svg'
hosted_build_regex+='|cloud\.drone\.io/api/badges/.+/status.svg'
hosted_build_regex+='|g\.codefresh\.io/api/badges/pipeline/'
hosted_build_regex+='|api\.shippable\.com/projects/.+/badge'
hosted_build_regex+='|app\.wercker\.com/status/'
hosted_build_regex+='|img\.shields\.io/.+/pipeline'
hosted_build_regex+='|img\.shields\.io/.+/build/'
hosted_build_regex+='|img\.shields\.io/buildkite/'
hosted_build_regex+='|img\.shields\.io/cirrus/'
hosted_build_regex+='|img\.shields\.io/docker/build/'
hosted_build_regex+='|img\.shields\.io/docker/cloud/build/'
hosted_build_regex+='|img\.shields\.io/travis/'
hosted_build_regex+='|img\.shields\.io/shippable/'
hosted_build_regex+='|img.shields.io/wercker/ci/'
hosted_build_regex+='|app\.buddy\.works/.*/pipelines/pipeline/.*/badge.svg'
hosted_build_regex+='|\.semaphoreci\.com/badges/'
# to check for any badges missed, just go
#grep -Ev "$hosted_build_regex" GIT_STATUS.md

self_hosted_build_regex='\[\!\[[^]]+\]\(.*\)\]\(.*/blob/master/('
self_hosted_build_regex+='Jenkinsfile'
self_hosted_build_regex+='|.concourse.yml'
self_hosted_build_regex+='|.gocd.yml'
self_hosted_build_regex+=')\)'

if [ -n "${DEBUG:-}" ]; then
    echo
    echo "Hosted Builds:"
    echo
    grep -E "$hosted_build_regex" "$tempfile" >&2 || :
    echo
    echo "Self-Hosted Builds:"
    echo
    grep -E "$self_hosted_build_regex" "$tempfile" >&2 || :
fi
num_hosted_builds="$(grep -Ec "$hosted_build_regex" "$tempfile" || :)"
num_self_hosted_builds="$(grep -Ec "$self_hosted_build_regex" "$tempfile" || :)"

num_builds=$((num_hosted_builds + num_self_hosted_builds))

lines_of_code="$(grep -Ei 'img.shields.io/badge/lines%20of%20code-[[:digit:]]+(\.[[:digit:]]+)?k' "$tempfile" | sed 's|.*img.shields.io/badge/lines%20of%20code-||; s/[[:alpha:]].*$//'| tr '\n' '+' | sed 's/+$//' | bc -l)"

{
cat <<EOF
# GitHub Status Page

![Original Repos](https://img.shields.io/badge/Repos-$actual_repos-blue?logo=github)
![Stars](https://img.shields.io/badge/Stars-$total_stars-blue?logo=github)
![Forks](https://img.shields.io/badge/Forks-$total_forks-blue?logo=github)
![Followers](https://img.shields.io/badge/Followers-$followers-blue?logo=github)
[![Azure DevOps Profile](https://img.shields.io/badge/Azure%20DevOps-HariSekhon-0078D7?logo=azure%20devops)](https://dev.azure.com/harisekhon/GitHub)
[![GitHub Profile](https://img.shields.io/badge/GitHub-HariSekhon-2088FF?logo=github)](https://github.com/HariSekhon)
[![GitLab Profile](https://img.shields.io/badge/GitLab-HariSekhon-FCA121?logo=gitlab)](https://gitlab.com/HariSekhon)
[![BitBucket Profile](https://img.shields.io/badge/BitBucket-HariSekhon-0052CC?logo=bitbucket)](https://bitbucket.org/HariSekhon)

[![CI Builds](https://img.shields.io/badge/CI%20Builds-$num_builds-blue?logo=circleci)](https://bitbucket.org/harisekhon/devops-bash-tools/src/master/STATUS.md)
![Lines of Code](https://img.shields.io/badge/lines%20of%20code-${lines_of_code}k-lightgrey?logo=codecademy)
![Last Generated](https://img.shields.io/badge/Last%20Generated-$(date +%F |
                                                                  # "$srcdir/urlencode.sh" |
                                                                  # need to escape dashes to avoid shields.io interpreting them as field separators
                                                                  sed 's/-/--/g')-lightgrey?logo=github)
[![GitStar Ranking Profile](https://img.shields.io/badge/GitStar%20Ranking-HariSekhon-blue?logo=github)](https://gitstar-ranking.com/HariSekhon)

[git.io/hari-ci](https://git.io/hari-ci) generated by \`${0##*/}\` in [HariSekhon/DevOps-Bash-tools](https://github.com/HariSekhon/DevOps-Bash-tools)

This page usually loads better on [BitBucket](https://bitbucket.org/harisekhon/devops-bash-tools/src/master/STATUS.md) due to less aggressive proxy timeouts cutting off badge loading than GitHub / GitLab

EOF
printf "%s " "$num_repos"
if [ "$original_sources" = 1 ]; then
    printf "original source "
fi
printf 'git repos with %s CI builds (%s hosted, %s self-hosted):\n\n' "$num_builds" "$num_hosted_builds" "$num_self_hosted_builds"
cat "$tempfile"
printf '\n%s git repos summarized with %s CI builds(%s hosted, %s self-hosted)\n' "$actual_repos" "$num_builds" "$num_hosted_builds" "$num_self_hosted_builds"
} | tee "$file"

trap '' exit