#! /bin/bash
#importer driglibash
echo "<execution of test_git_update.sh>"

#Variables definitions
REPO_NAME="performance_testing"
REMOTE="https://git.jean-cloud.net/eleonore/performance_testing.git"
WITH_SUBMODULE="true"
FILENAMES=("sample0" "sample1 sample3") #we do not check for all files
FILENAMES_TAG=("sample0 sample1 sample4")
FILENAMES_BRANCH=("sample0 sample1 sample2") #we do not check for all files, especially not those specific to the branch.
FILE_ON_BRANCH_ONLY="sample2"
FILE_ON_TAG_ONLY="sample4"
FILE_ON_MAIN_ONLY="sample3"
FILE_TO_BE_DELETED="sample0" 
FILE_TO_BE_CREATED="new_file"
FILE_TO_BE_MODIFIED=$FILE_TO_BE_CREATED
TAG_NAME="tagging_point"
TAG_FLAG="tag_flag"
BRANCH_NAME="secondary"
TMP_CLONE_DIR="tmp_local_clone"
TMP_EXISTING_DIR="tmp_existing_dir"
TMP_EXISTING_FILE="tmp_existing_file"

Help()
{
   echo "
NAME
    test_git_update.sh
SYNOPSIS
    test_git_update.sh [-a] [-h] [-n number]
OPTIONS
    -a excutes all the tests.
    -n number executes test number
    -h prints the help. 
DESCRIPTION
    Tests on the initial cloning
    TEST0: git cloned in an empty directory
    TEST1: git cloned in an empty directory with tag
    TEST2: git cloned in an empty directory with branch
    TEST3: git cloned in an existing directory
    TEST4: git updated fast-forward on main
    TEST5: git updated with underlying conflict on main
    TEST6: git updated, switching to another branch, deleting and adding files in the process
    TEST7: git updated, switching to a tag, deleting and adding files in the process
    TEST8: git updated, before and after changing a tag, deleting and adding files in the process
"
}

#output function
section(){
    echo "------------------------------ $1 ------------------------------"
}
#check functions
cloning_check(){
    local input=("$@")
    local repo_name=${input[0]}
    local FILENAMES=${input[@]:1}
    if  [[ -d "./$repo_name" ]]; then
        echo "into $repo_name"
        cloning_result=0
        for FILE in ${FILENAMES[@]}
        do  
            if [ -f "./$repo_name/$FILE" ]; then 
                echo "the file $FILE has correctly been imported"
            else 
                echo "the file $FILE could not be imported"
                cloning_result=1
            fi
        done  
    else
        cloning_result=1
        echo "the directory $repo_name could not be created"
    fi
}

history_check(){
    local repo_name=$1
    cd $repo_name
    history_result=0
    if [ $(git log | grep "Date" | wc -l) -gt 1 ]; then
        echo "Several commits have been saved"
        history_result=1
    elif [ $(git log | grep "Date" | wc -l) = 1 ]; then
        echo "Only the last commit has been saved"
    else
        history_result=1
        echo "Cloning error, incoherent git log"
    fi
    cd ..
}

tag_check(){
    local repo_name=$1
    cd $repo_name
    git branch > res
    if [ $(grep "no branch" res | wc -l) = 1 ]; then
        echo "The tag instruction has been respected"
        tag_result=0
    else
        echo "The tag instruction has not been respected"
        tag_result=1
    fi
    cd ..
}

branch_check(){
    local repo_name=$1
    cd $repo_name
    git branch > res
    if [ $(grep $BRANCH_NAME res | wc -l) = 1 ];then
        echo "The branch instruction has been respected"
        branch_result=0
    else
        branch_result=1
        echo "The branch instruction has not been respected"
    fi
    cd ..
}

existing_check(){
    cd $TMP_EXISTING_DIR
    if [ -f $TMP_EXISTING_FILE ]; then
        echo "The preexisting non-conflicting file is still here."
        existing_result=0
        cd ..
        conflict_check $TMP_EXISTING_DIR
        existing_result=conflict_result
    else
        echo "The preexisting non-conflicting file has been deleted."
        cd ..
        existing_result=1
    fi
}

modification_check(){
    local repo_name=$1
    cd $repo_name
    if [ -f $FILE_TO_BE_CREATED ]; then
        echo "The new file has been imported."
        modification_result=0
        
    else
        echo "The new file has not been imported."
        modification_result="1"
    fi
    if [ -f "$FILE_TO_BE_DELETED" ]; then
        echo "$FILE_TO_BE_DELETED has not been deleted."
        modification_result="1"
    else    
        echo "$FILE_TO_BE_DELETED has been deleted."
    fi
    cd ..
}

switching_branch_check(){
    local repo_name=$1
    cd $repo_name
    if [ -f $FILE_ON_BRANCH_ONLY ]; then
        echo "The files of the branch $BRANCH_NAME are present."
        branch_switching_result=0
            if [ -f $FILE_ON_MAIN_ONLY ]; then
                echo "The files of the branch main are present."
                branch_switching_result=1
            else
                echo "The files of the branch main are absent."
                branch_switching_result=0
            fi
    else
        echo "The files of the branch $BRANCH_NAME are absent."
        branch_switching_result=1
    fi
    cd ..
}

switching_tag_check(){
    local repo_name=$1
    cd $repo_name
    if [ -f $FILE_ON_TAG_ONLY ]; then
        echo "The files of the tag $TAG_NAME are present."
        tag_switching_result=0
            if [ -f $FILE_ON_MAIN_ONLY ]; then
                echo "The files of the last commit on main are present."
                tag_switching_result=1
            else
            echo "The files of the last commit in main are absent."
                tag_switching_result=0
            fi
    else
        echo "The files of the tag $TAG_NAME are absent."
        tag_switching_result=1
    fi
    cd ..
}

conflict_check(){
    local repo_name=$1
    cd $repo_name
    if [[ $(grep "new" $FILE_TO_BE_MODIFIED | wc -l) > 0 && $(grep "different" $FILE_TO_BE_MODIFIED | wc -l) = 0 ]]; then
        echo "The remote version has overwritten the local version."
        conflict_result=0
    else
        echo "The remote version has not overwritten the local version."
    fi
    cd ..
}

#intermediate functions
make_temporary_existing_dir(){
    mkdir $TMP_EXISTING_DIR
    cd $TMP_EXISTING_DIR
    touch $TMP_EXISTING_FILE
    touch $FILE_TO_BE_MODIFIED
    echo "this should be overwritten" > $FILE_TO_BE_MODIFIED
    cd ..    
}

make_temporary_clone(){
    mkdir $TMP_CLONE_DIR
    cd $TMP_CLONE_DIR
    git clone --recurse-submodules --shallow-submodules --depth 1 --no-single-branch --config core.sshCommand="ssh" $REMOTE . &> /dev/null
    cd ..
}

modification_remote(){
    cd $TMP_CLONE_DIR
    touch $FILE_TO_BE_CREATED
    echo "new text" > $FILE_TO_BE_CREATED
    rm $FILE_TO_BE_DELETED
    git add $FILE_TO_BE_CREATED $FILE_TO_BE_DELETED &> /dev/null
    git commit -m "$FILE_TO_BE_CREATED created and $FILE_TO_BE_DELETED deleted" &> /dev/null
    git push &> /dev/null
    cd ..
}

undo_modification_remote(){
    cd $TMP_CLONE_DIR
    git revert --no-edit HEAD &> /dev/null
    git push &> /dev/null
    cd ..
}

modification_local(){
    cd $REPO_NAME
    touch $FILE_TO_BE_CREATED
    echo "different text" > $FILE_TO_BE_CREATED
    git add $FILE_TO_BE_CREATED &> /dev/null
    git commit -m "$FILE_TO_BE_CREATED added" &> /dev/null
    cd ..
}

changing_tag(){
    cd $TMP_CLONE_DIR
    git checkout $TAG_NAME &> /dev/null 
    git tag -f $TAG_FLAG &> /dev/null #temporary tag flag to be able to put the tag back here after the test
    git push -f origin $TAG_FLAG &> /dev/null 
    git checkout $BRANCH_NAME &> /dev/null 
    git tag -f $TAG_NAME &> /dev/null #moving the tag on the branch secondary
    git push -f origin $TAG_NAME &> /dev/null #push the move to the remote
    cd ..
}

undo_changing_tag(){
    cd $TMP_CLONE_DIR
    git checkout $TAG_FLAG &> /dev/null
    git tag -f $TAG_NAME &> /dev/null #move locally
    git push -f origin $TAG_NAME &> /dev/null #push the move to the remote
    git push --delete origin $TAG_FLAG &> /dev/null #delete remotely
    git tag --delete $TAG_FLAG &> /dev/null #delete locally
    cd ..
    rm -rf $TMP_CLONE_DIR
}


test0 (){
    #CASE 0: git cloned in an empty directory
    section TEST0
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    ./git_update.sh -d $REPO_NAME $REMOTE &> /dev/null
    #checks
    cloning_check $REPO_NAME ${FILENAMES[@]}
    history_check $REPO_NAME
    case0=$((history_result+cloning_result))
    if [ "$case0" = "0" ]; then
        echo "case 0, in a empty directory: OK"
    else
        echo "case 0, in a empty directory: FAIL"
    fi
}

test1(){
    #CASE 1: git cloned in an empty directory with tag
    section TEST1
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    ./git_update.sh -d $REPO_NAME -r $TAG_NAME $REMOTE &> /dev/null
    #checks
    cloning_check $REPO_NAME ${FILENAMES_TAG[@]}
    history_check $REPO_NAME
    tag_check $REPO_NAME

    case1=$((cloning_result+history_result+tag_result))
    if [ $case1 = 0 ]; then
        echo "case 1, in a empty directory, with tag: OK"
    else
        echo "case 1, in a empty directory, with tag: FAIL"
    fi
}

test2(){
#CASE 2: git cloned in an empty directory with branch
    section TEST2
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    ./git_update.sh -d $REPO_NAME -r $BRANCH_NAME $REMOTE &> /dev/null
    #checks
    cloning_check $REPO_NAME ${FILENAMES_BRANCH[@]} #we do not check for all files, especially not those specific to the branch.
    history_check $REPO_NAME
    branch_check $REPO_NAME

    case2=$((cloning_result+history_result+branch_result))
    if [ $case2 = 0 ]; then
        echo "case 2, in a empty directory, with branch: OK"
    else
        echo "case 2, in a empty directory, with branch: FAIL"
    fi
}

test3(){
#CASE 3: git cloned in an existing directory
    section TEST3
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    #mimic an existing directory, with two existing file, one with the same name as a to-be-cloned file, and go inside the new dir
    make_temporary_existing_dir
    #make git_update.sh clone in the existing dir
    cd $TMP_EXISTING_DIR
    ../git_update.sh -N $REMOTE &> /dev/null
    cd ..
    #checks
    cloning_check $TMP_EXISTING_DIR ${FILENAMES[@]}
    history_check $TMP_EXISTING_DIR
    existing_check
    rm -rf tmp_existing_dir

    case3=$((cloning_result+history_result+existing_result))
    if [ $case3 = 0 ]; then
        echo "case 3, in a non-empty directory  : OK"
    else
        echo "case 3, in a non-empty directory  : FAIL"
    fi

}

test4(){
#CASE 4: git updated fast-forward on main
    section TEST4
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    #clone the repo in its last state
    git clone --recurse-submodules --shallow-submodules --depth 1 --config core.sshCommand="ssh" $REMOTE &> /dev/null
    #modify the remote from elsewhere
    modification_remote
    #make git_update.sh update the repository
    cd $REPO_NAME
    ../git_update.sh $REMOTE &> /dev/null
    cd ..
    #checks
    modification_check $REPO_NAME
    history_check $REPO_NAME
    #cleaning
    undo_modification_remote

    case4=$((modification_result+history_result))
    if [ "$case4" = "0" ]; then
        echo "case 4, fast-forward update on main: OK"
    else
        echo "case 4, fast-forward update on main: FAIL"
    fi
}

test5(){
#CASE 5: git updated with underlying conflict on main
    section TEST5
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    #clone the repo in its last state
    git clone --recurse-submodules --shallow-submodules --depth 1 --config core.sshCommand="ssh" $REMOTE &> /dev/null
    #modify the local repo
    modification_local
    #modify the remote from elsewhere
    modification_remote
    #make git_update.sh update the local repository
    cd $REPO_NAME
    ../git_update.sh $REMOTE &> /dev/null
    cd ..
    #checks
    conflict_check $REPO_NAME
    #cleaning
    undo_modification_remote

    case5=$((conflict_result+history_result))
    if [ "$case5" = "0" ]; then
        echo "case 5, update with underlying conflict: OK"
    else
        echo "case 5, update with underlying conflict: FAIL"
    fi
}

test6(){
#CASE 6: git updated, switching to another branch, deleting and adding files in the process
    section TEST6
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    #clone the repo in its last state
    git clone --recurse-submodules --shallow-submodules --depth 1 --config core.sshCommand="ssh" $REMOTE &> /dev/null
    #call git update with another branch
    cd $REPO_NAME
    ../git_update.sh -r $BRANCH_NAME $REMOTE &> /dev/null
    cd ..
    #checks
    switching_branch_check $REPO_NAME
    history_check $REPO_NAME
    case6=$((branch_switching_result+history_result))
    if [ "$case6" = "0" ]; then
        echo "case 6, branch-switching update: OK"
    else
        echo "case 6, branch-switching update: FAIL"
    fi
}

test7(){
#CASE 7: git updated, switching to a tag, deleting and adding files in the process
    section TEST7
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    #clone the repo in its last state
    git clone --recurse-submodules --shallow-submodules --depth 1 --config core.sshCommand="ssh" $REMOTE &> /dev/null
    #call git_update.sh with a tag
    cd $REPO_NAME
    ../git_update.sh -r $TAG_NAME $REMOTE &> /dev/null
    cd ..
    #checks
    switching_tag_check $REPO_NAME
    history_check $REPO_NAME
    case7=$((tag_switching_result+history_result))
    if [ "$case7" = "0" ]; then
        echo "case 7, tag-switching update: OK"
    else
        echo "case 7, tag-switching update: FAIL"
    fi
}

test8(){
#CASE 8: git updated, before and after changing a tag, deleting and adding files in the process
    section TEST8
    #if it exists, delete the directory
    if [ -d $REPO_NAME ]; then
        rm -rf $REPO_NAME
    fi
    #clone the repo in its last state
    git clone --recurse-submodules --shallow-submodules --depth 1 --config core.sshCommand="ssh" $REMOTE &> /dev/null
    #call git_update.sh with a tag
    cd $REPO_NAME
    ../git_update.sh -r $TAG_NAME $REMOTE &> /dev/null
    cd ..
    #intermediate check to make sure that we are starting on the initial position of the tag
    echo "first position of the tag"
    switching_tag_check $REPO_NAME
    #change the position of the tag from elsewhere
    changing_tag
    #call git_update.sh again to go to the new position of the tag
    cd $REPO_NAME
    ../git_update.sh -r $TAG_NAME $REMOTE &> /dev/null
    cd ..
    #put back the remote in its initial state
    undo_changing_tag

    #checks
    echo "second position of the tag"
    switching_branch_check $REPO_NAME #new position of the tag=last commit of the branch hence we can reuse this check
    history_check $REPO_NAME
    case8=$((tag_switching_result+branch_switching_result+history_result))
    if [ "$case8" = "0" ]; then
        echo "case 8, tag-changing update: OK"
    else
        echo "case 8, tag-changing update: FAIL"
    fi

}

while getopts ":hn:a" option; do
   case $option in
      h) # display Help
         Help
         exit;;
      n) 
            TEST_NUM=$OPTARG;;
      a) 
            ALL_TESTS="true";; 
     \?) # Invalid option
         echo "Error: Invalid option here"
         exit;;
   esac
done

if [ "$ALL_TESTS" = "true" ]; then
    make_temporary_clone
    test0
    test1 
    test2 
    test3 
    test4 
    test5 
    test6 
    test7 
    test8 
    rm -rf $TMP_CLONE_DIR
elif [ -n "$TEST_NUM" ]; then
    #in order to only create the temporary clone once if we execute all tests
    if [[ "$TEST_NUM" = 4 || "$TEST_NUM" = 5 || "$TEST_NUM" = 8 ]]; then
            make_temporary_clone
    fi
    case $TEST_NUM in
        0) 
            test0;;
        1)
            test1;;
        2) 
            test2;;
        3) 
            test3;;
        4) 
            test4;;
        5) 
            test5;;
        6)
            test6;;
        7) 
            test7;;
        8) 
            test8;;
        *)
            echo "Error: Invalid test number"
            exit;;
    esac
    if [[  "$TEST_NUM" = 4 || "$TEST_NUM" = 5 || "$TEST_NUM" = 8 ]]; then
            rm -rf $TMP_CLONE_DIR
    fi
else
    Help
fi