#!/bin/bash

# Applies current directory content as a patch to an existing git repository
#
# Usage: ./git-apply-patch.sh <config-file>
#
# Config file format:
#   GIT_URL=https://github.com/user/repo.git
#   GIT_USER=username
#   GIT_TOKEN=your_token_or_password
#
# VERSION file format:
#   <new_version>
#   last_version: <previous_version>
#   source_branch: <branch_name> (optional)

set -e

if [ -z "$1" ]; then
    echo "Usage: $0 <config-file>"
    exit 1
fi

CONFIG_FILE="$1"

if [ ! -f "$CONFIG_FILE" ]; then
    echo "Error: Config file '$CONFIG_FILE' not found"
    exit 1
fi

# Load config file
source "$CONFIG_FILE"

# Validate required fields
if [ -z "$GIT_URL" ]; then
    echo "Error: GIT_URL not defined in config file"
    exit 1
fi

if [ -z "$GIT_USER" ]; then
    echo "Error: GIT_USER not defined in config file"
    exit 1
fi

if [ -z "$GIT_TOKEN" ]; then
    echo "Error: GIT_TOKEN not defined in config file"
    exit 1
fi

# Read VERSION file
if [ ! -f "VERSION" ]; then
    echo "Error: VERSION file not found in current directory"
    exit 1
fi

NEW_VERSION=$(sed -n '1p' VERSION)
LAST_VERSION=$(sed -n '2p' VERSION | sed 's/last_version: //')
SOURCE_BRANCH=$(sed -n '3p' VERSION | sed 's/source_branch: //')

if [ -z "$NEW_VERSION" ]; then
    echo "Error: New version not found in VERSION file (line 1)"
    exit 1
fi

if [ -z "$LAST_VERSION" ]; then
    echo "Error: last_version not found in VERSION file (line 2)"
    exit 1
fi

echo "New version: $NEW_VERSION"
echo "Last version: $LAST_VERSION"
echo "Source branch: ${SOURCE_BRANCH:-N/A}"

# Build authenticated URL
if [[ "$GIT_URL" == https://* ]]; then
    URL_WITHOUT_PROTOCOL="${GIT_URL#https://}"
    AUTH_URL="https://${GIT_USER}:${GIT_TOKEN}@${URL_WITHOUT_PROTOCOL}"
elif [[ "$GIT_URL" == http://* ]]; then
    URL_WITHOUT_PROTOCOL="${GIT_URL#http://}"
    AUTH_URL="http://${GIT_USER}:${GIT_TOKEN}@${URL_WITHOUT_PROTOCOL}"
else
    echo "Error: URL must start with http:// or https://"
    exit 1
fi

# Create temp directory for cloning
TEMP_DIR=$(mktemp -d)
CURRENT_DIR=$(pwd)

echo ""
echo "Cloning repository from branch '$LAST_VERSION'..."
git clone --branch "$LAST_VERSION" --single-branch "$AUTH_URL" "$TEMP_DIR" 2>/dev/null || {
    echo "Branch '$LAST_VERSION' not found, trying to clone default branch..."
    git clone "$AUTH_URL" "$TEMP_DIR"
    cd "$TEMP_DIR"
    git checkout -b "$LAST_VERSION" 2>/dev/null || git checkout "$LAST_VERSION"
    cd "$CURRENT_DIR"
}

echo "Copying current files to cloned repository..."
# Copy all files except .git, temp dir, and config file
rsync -av \
    --exclude='.git' \
    --exclude='test' \
    --exclude="$(basename "$TEMP_DIR")" \
    --exclude="$CONFIG_FILE" \
    "$CURRENT_DIR/" "$TEMP_DIR/"

cd "$TEMP_DIR"

echo "Creating new branch '$NEW_VERSION'..."
git checkout -b "$NEW_VERSION" 2>/dev/null || git checkout "$NEW_VERSION"

echo "Adding changes..."
git add -A

echo "Committing changes..."
COMMIT_MSG="Release $NEW_VERSION"
if [ -n "$SOURCE_BRANCH" ]; then
    COMMIT_MSG="$COMMIT_MSG (from $SOURCE_BRANCH)"
fi
git commit -m "$COMMIT_MSG" || echo "Nothing to commit"

echo "Pushing to remote..."
git push -u origin "$NEW_VERSION"

# Cleanup
cd "$CURRENT_DIR"
rm -rf "$TEMP_DIR"

echo ""
echo "Done! Patch applied and pushed to branch '$NEW_VERSION'"
echo "Based on previous version: '$LAST_VERSION'"