#!/bin/bash

# Initializes a git repository and pushes to a remote using credentials from arguments
#
# Usage: ./git-init-from-config.sh <git-url> <git-user> <git-token>
#
# Arguments:
#   git-url    - Repository URL (e.g., https://gitea.example.com/user/repo.git)
#   git-user   - Git username
#   git-token  - Git token or password
#
# The branch name will be read from the VERSION file (first line)

set -e
set -o pipefail

if [ "$#" -lt 3 ]; then
    echo "Usage: $0 <git-url> <git-user> <git-token>"
    echo ""
    echo "Arguments:"
    echo "  git-url    - Repository URL (e.g., https://gitea.example.com/user/repo.git)"
    echo "  git-user   - Git username"
    echo "  git-token  - Git token or password"
    exit 1
fi

GIT_URL="$1"
GIT_USER="$2"
GIT_TOKEN="$3"

if [ -z "$GIT_URL" ]; then
    echo "Error: git-url is required"
    exit 1
fi

if [ -z "$GIT_USER" ]; then
    echo "Error: git-user is required"
    exit 1
fi

if [ -z "$GIT_TOKEN" ]; then
    echo "Error: git-token is required"
    exit 1
fi

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

GIT_BRANCH=$(head -n 1 VERSION | tr -d '[:space:]')

if [ -z "$GIT_BRANCH" ]; then
    echo "Error: VERSION file is empty"
    exit 1
fi

echo "Version detected: $GIT_BRANCH"

if [[ "$GIT_URL" != http://* && "$GIT_URL" != https://* ]]; then
    echo "Error: URL must start with http:// or https://"
    exit 1
fi

# Credentials are passed to git through GIT_ASKPASS instead of being embedded in
# the remote URL. Embedding breaks on passwords containing '@', '#', ':' or '/'
# (git splits the userinfo on the first '@'), and it would also persist the
# secret in .git/config and echo it back in error messages.
ASKPASS_SCRIPT=$(mktemp "${TMPDIR:-/tmp}/git-askpass.XXXXXX")
trap 'rm -f "$ASKPASS_SCRIPT"' EXIT
cat > "$ASKPASS_SCRIPT" <<'ASKPASS'
#!/bin/bash
case "$1" in
    *[Uu]sername*) printf '%s' "$GIT_ASKPASS_USER" ;;
    *)             printf '%s' "$GIT_ASKPASS_TOKEN" ;;
esac
ASKPASS
chmod 700 "$ASKPASS_SCRIPT"
export GIT_ASKPASS="$ASKPASS_SCRIPT"
export GIT_ASKPASS_USER="$GIT_USER"
export GIT_ASKPASS_TOKEN="$GIT_TOKEN"
export GIT_TERMINAL_PROMPT=0

echo "Initializing git repository..."
git init

echo "Configuring Git for large files..."
# Repository-local so the caller's global git config is left untouched.
# Increase HTTP post buffer to handle large files (500MB)
git config http.postBuffer 524288000
# Optimize compression for large files
git config core.compression 9
# Increase timeout for long operations (30 minutes)
git config http.lowSpeedLimit 0
git config http.lowSpeedTime 1800

echo "Adding all files (this may take a while for large files)..."
git add -A
TOTAL_FILES=$(git ls-files | wc -l)
TOTAL_SIZE=$(du -sh . | cut -f1)
echo "Added $TOTAL_FILES files (total size: $TOTAL_SIZE)"

echo "Creating initial commit..."
git commit -m "Initial commit" || echo "Nothing to commit or already committed"

echo "Setting branch to $GIT_BRANCH..."
git branch -M "$GIT_BRANCH"

echo "Adding remote origin..."
git remote remove origin 2>/dev/null || true
git remote add origin "$GIT_URL"

echo "Pushing to remote (this may take a while for large files)..."
# Not piped: piping made the exit status that of the pipe's last command, so a
# failed push was reported as success.
git push --progress -u origin "$GIT_BRANCH"

echo ""
echo "Done! Repository pushed to $GIT_URL on branch $GIT_BRANCH"