#!/bin/bash

REPO_URL="https://oauth2:${GL_TOKEN}@gitlab.sofa.dev/mrds/mrds_elt.git"
DEV_BRANCH="dev"
TARGET_BRANCH="latest"
WORK_DIR="mrds_elt_merge"
MERGE_BRANCH="dev_to_latest_merge"
DIRECTORIES=(
    "airflow/devo_replicator"
    "airflow/ods/rqsd"
    "airflow/mopdb/RQSD"
    "dbt"
    "python/connectors/devo"
    "python/devo_replicator"
    "python/mrds_common"
    ".ci"
    ".gitlab-ci.yml"
    ".ci/mr_dev_to_latest.sh"
)

echo "Setting up working directory..."
git branch -D "$MERGE_BRANCH" 2>/dev/null || true
rm -rf "$WORK_DIR"
mkdir -p "$WORK_DIR"
cd "$WORK_DIR"

echo "Cloning repository..."
git clone "$REPO_URL" .
git config --global user.email "cicd@sofa.dev"
git config --global user.name "CICD Pipeline"

echo "Creating merge branch from $TARGET_BRANCH..."
git checkout "$TARGET_BRANCH"
git checkout -b "$MERGE_BRANCH"

echo "Fetching $DEV_BRANCH branch..."
git fetch origin "$DEV_BRANCH"

echo "Selecting changes from $DEV_BRANCH for specific directories..."
CHANGES_FOUND=false

for dir in "${DIRECTORIES[@]}"; do
    echo "Copying $dir from $DEV_BRANCH to $MERGE_BRANCH"
    git checkout "origin/$DEV_BRANCH" -- "$dir"
done

if ! git diff --quiet "$TARGET_BRANCH"; then
    git commit -am "Update selected directories from $DEV_BRANCH"
    CHANGES_FOUND=true
fi

if ! git diff --quiet "$TARGET_BRANCH"; then
    CHANGES_FOUND=true
fi

if [ "$CHANGES_FOUND" = true ]; then
    echo "Pushing merge branch..."
    git push -f -u "$REPO_URL" "$MERGE_BRANCH"

    echo "Creating merge request..."
    if [ -z "$GL_TOKEN" ]; then
        echo "GL_TOKEN environment variable not set. Cannot create merge request."
        exit 1
    else
        curl -X POST \
             -H "PRIVATE-TOKEN: $GL_TOKEN" \
             "https://gitlab.sofa.dev/api/v4/projects/${CI_PROJECT_ID}/merge_requests" \
             -d "source_branch=${MERGE_BRANCH}&target_branch=${TARGET_BRANCH}&title=Requested merge of selected directories from ${DEV_BRANCH} to ${TARGET_BRANCH}&description=This MR contains selected directories from ${DEV_BRANCH} branch."
    fi
else
    echo "No changes found between $DEV_BRANCH and $TARGET_BRANCH for the specified directories."
    echo "Skipping merge request creation."
    exit 0
fi