#!/usr/bin/env bash
# ===========================================================================
#  Stage 05: Git Configuration & SSH Keys
#  Deploys .gitconfig and optionally generates SSH keys.
# ===========================================================================
#  The Pop machine's .gitconfig is well-optimised:
#    - SSH key signing (gpg.format = ssh)
#    - zdiff3 conflict style, histogram diff algorithm
#    - rerere.enabled, autoSquash, autoStash
#    - push.autoSetupRemote, pull.rebase, fetch.prune
# ===========================================================================

CONFIG_DIR="${SCRIPT_DIR:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}/config"

# ---- Deploy .gitconfig ----
info "Deploying .gitconfig..."
if [ -f "$HOME/.gitconfig" ]; then
  cp "$HOME/.gitconfig" "$HOME/.gitconfig.bak.$(date +%Y%m%d)" 2>/dev/null
  warn "Backed up existing .gitconfig"
fi

# Use the template from config/git/gitconfig
# NOTE: This template does NOT contain your signing key or email.
# Edit it after deployment to set:
#   [user]
#     name = Your Name
#     email = your.email@example.com
#     signingkey = <your-ssh-public-key>
cp "${CONFIG_DIR}/git/gitconfig" "$HOME/.gitconfig"
ok ".gitconfig deployed."
warn "REMINDER: Edit ~/.gitconfig to set your name, email, and signingkey."

# ---- Deploy .gitignore_global ----
info "Deploying global .gitignore..."
if [ -f "$HOME/.gitignore" ]; then
  warn "Global .gitignore already exists (keeping)."
else
  # A sensible global gitignore for common OS + editor files
  cat > "$HOME/.gitignore" << 'EOF'
# OS files
.DS_Store
Thumbs.db
Desktop.ini

# Editor/IDE
*.swp
*.swo
*~
.vscode/
.idea/
*.sublime-*

# Python
__pycache__/
*.py[cod]
*.egg-info/
.venv/
.eggs/

# Node
node_modules/
.npm/

# Rust
target/
EOF
  ok "Global .gitignore deployed."
fi

# ---- SSH keys ----
# All SSH keys are stored in Bitwarden and loaded via bw-load-ssh.sh (stage 06).
# No local keys are generated.
info "SSH keys: loaded from Bitwarden via stage 06 (bw-load-ssh.sh)."

# ---- Pre-accept GitHub host key ----
# Avoids interactive prompt on first SSH connection to GitHub
if [ ! -f "$HOME/.ssh/known_hosts" ] || ! ssh-keygen -F github.com &>/dev/null; then
  info "Adding github.com SSH host key to known_hosts..."
  mkdir -p "$HOME/.ssh"
  ssh-keyscan github.com >> "$HOME/.ssh/known_hosts" 2>/dev/null && \
    chmod 644 "$HOME/.ssh/known_hosts" && \
    ok "GitHub host key added." || warn "Could not fetch GitHub host key."
else
  ok "GitHub host key already known."
fi

ok "Stage 05 complete: Git configured."