#!/usr/bin/env bash

script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
main_script="git-repo-watcher"
shunit_git="https://github.com/kward/shunit2"

# The tests use the temp folder to store the test framework
# and all generated git repositories
temp_dir="/tmp/git-repo-watcher"
stdout="$temp_dir/stdout.txt"
shunit2_dir="$temp_dir/shunit2/"

remote_repo="remote"
remote_repo_clone="remote-clone"
watched_clone="watched-clone"

test_file_name="test-file"
test_commit_message="Test commit message"

# A verbose-flag can be passed ("-v")
[[ "$1" == "-v" ]] && verbose=true && shift

# Redirecting output
if [[ "$verbose" ]]; then
    exec 3>&1
    exec 4>&2
else
    exec 3>/dev/null
    exec 4>/dev/null
fi

# Create temp directory
[[ ! -d "$temp_dir" ]] && mkdir "$temp_dir"

# Checkout shunit2 unit test framework
if [[ ! -d "$shunit2_dir" ]]; then
    git clone --depth 1 "$shunit_git" "$shunit2_dir"
fi

# Prints a seperator. It helps to make the output more readable.
printSeparator() {
    local sep="$1"
    [[ -z "$sep" ]] && sep="-"

    # shellcheck disable=SC2034
    for i in {1..75}; do local x=$x"$sep"; done && echo "$x"
}

# Removes created temp files and directories
cleanupTempFiles() {
    [[ -f "$stdout" ]] && rm "$stdout"
    [[ -d "$temp_dir/$remote_repo" ]] && rm -rf "${temp_dir:?}/$remote_repo"
    [[ -d "$temp_dir/$watched_clone" ]] && rm -rf "${temp_dir:?}/$watched_clone"
    [[ -d "$temp_dir/$remote_repo_clone" ]] && rm -rf "${temp_dir:?}/$remote_repo_clone"
    # I don't know why, but the following tests seem to start,
    # before all temp files are deleted, so we pause a little
    sleep 0.05
}

# Will be executed before each test
# https://github.com/kward/shunit2#-setupteardown
setUp() {
    cd "$script_dir" || exit 1

    # Create a fresh 'remote' git repository
    git init --bare "$temp_dir/$remote_repo" 1>&3 2>&4
    git clone "$temp_dir/$remote_repo" "$temp_dir/$remote_repo_clone" 1>&3 2>&4
    pushOneFile 'README.md'
    git clone "$temp_dir/$remote_repo" "$temp_dir/$watched_clone" 1>&3 2>&4
}

# Will be executed after each test
tearDown() {
    cleanupTempFiles
    printSeparator
    return 0
}

# Commiting and pushing file to remote repository
#
# $1 - File name
# $2 - Commit message
pushOneFile() {
    local file="$1"
    [[ -z "$file" ]] && file="$test_file_name"

    local message="$2"
    [[ -z "$message" ]] && message="$test_commit_message"

    cd "$temp_dir/$remote_repo_clone" || exit 1
    touch "$file"
    git add . 1>&3 2>&4
    git commit -m "$message" 1>&3 2>&4
    git push 1>&3 2>&4
}

printBashVersion() {
    echo && printSeparator "#"
    echo "Testing on bash-version: '$BASH_VERSION'"
    printSeparator "#" && echo && printSeparator
}

# Start the main git-repo-watcher-script
#
# $1 - override options
startWatcher() {
    local options=" -d $temp_dir/$watched_clone"
    [[ -n "$1" ]] && options="$1"

    # A short interval is used to guarantee multiple iterations
    options="$options -i 0.1" # 0.1 seconds
    eval "$script_dir/$main_script $options" &>$stdout &
    watcher_pid=$!
}

# $1 - time to collect output
collectOutput() {
    local sleep_time=1
    [[ -n "$1" ]] && sleep_time="$1"

    # We wait one second to collect stdout of multiple
    # iterations of the main watch loop.
    sleep "$sleep_time"

    # Killing the watcher script
    disown "$watcher_pid"
    kill "$watcher_pid" 2>/dev/null

    # Reading the logfile
    result=$(cat "$stdout")

    [[ "$verbose" ]] && echo "$result"
}

# $1 - branch name
createNewBranch() {
    cd "$temp_dir/$remote_repo_clone" || exit 1
    git checkout -b "$1" 1>&3 2>&4
    git push --set-upstream origin "$1" 1>&3 2>&4
}

# -------------------------------------------------------------------- #

# Should print the help screen, if no arguments given
testHelpScreen() {
    startWatcher " " # no arguments
    collectOutput 0.1

    assertContains "$result" "ERROR: Git directory (-d) not given!"
    assertContains "$result" "The following options are available:"
}

# -------------------------------------------------------------------- #

testNewCommitBeforeStart() {
    pushOneFile
    startWatcher
    collectOutput

    assertContains "$result" "1 file changed"
}

# -------------------------------------------------------------------- #

testNewCommitAfterStart() {
    startWatcher
    pushOneFile
    collectOutput

    assertContains "$result" "1 file changed"
}

# -------------------------------------------------------------------- #

testPulledHook() {
    pushOneFile
    startWatcher
    collectOutput

    assertContains "$result" "Changes pulled"
}

# -------------------------------------------------------------------- #

testSpecialCharactersInCommitMessage() {
    local message="!$%&/()=?{[]}#<>§|;:_,.-*+~'\"´\`"

    pushOneFile "$test_file_name" "$message"
    startWatcher
    collectOutput

    assertContains "$result" "$message"
}

# -------------------------------------------------------------------- #

testNothingChangedHook() {
    startWatcher
    collectOutput 0.2

    assertContains "$result" "Nothing changed"
}

# -------------------------------------------------------------------- #

testStartupHook() {
    startWatcher
    collectOutput

    assertContains "$result" "Watch started"
}

# -------------------------------------------------------------------- #

testBranchChangedHook() {
    local branch="new_branch"
    createNewBranch "$branch"

    startWatcher

    sleep 0.5
    cd "$temp_dir/$watched_clone" || exit 1
    git checkout -t "origin/$branch" 1>&3 2>&4

    collectOutput

    assertContains "$result" "Branch changed"
    assertContains "$result" "$branch"
}

# -------------------------------------------------------------------- #

testNoUpstreamHook() {
    startWatcher

    sleep 0.5
    cd "$temp_dir/$watched_clone" || exit 1
    git checkout -b "new_branch" 1>&3 2>&4

    collectOutput

    assertContains "$result" "Upstream not set"
}

# -------------------------------------------------------------------- #

testRelativePath() {
    pushOneFile

    # Use a relative path for the git directory
    cd "$temp_dir" || exit 1
    startWatcher "-d $watched_clone"

    collectOutput

    assertNotContains "$result" "No such file or directory"
    assertContains "$result" "Changes pulled"
}

# -------------------------------------------------------------------- #

printBashVersion

# shellcheck source=/tmp/git-repo-watcher/shunit2
. $shunit2_dir/shunit2

# -------------------------------------------------------------------- #