#!/bin/bash
# tailscale-gitea.sh — Standardized Tailscale IP detection module for Gitea API access
# Issue: timmy-home#385 — Standardize Tailscale IP detection across auxiliary scripts
#
# Usage (source this file in your script):
#   source /path/to/tailscale-gitea.sh
#   # Now use $GITEA_BASE_URL for API calls
#
# Configuration (set before sourcing to customize):
#   TAILSCALE_IP       - Tailscale IP to try first (default: 100.126.61.75)
#   PUBLIC_IP          - Public fallback IP (default: 143.198.27.163)
#   GITEA_PORT         - Gitea API port (default: 3000)
#   TAILSCALE_TIMEOUT  - Connection timeout in seconds (default: 2)
#   GITEA_API_VERSION  - API version path (default: api/v1)
#
# Sovereignty: Private Tailscale network preferred over public internet

# --- Default Configuration ---
: "${TAILSCALE_IP:=100.126.61.75}"
: "${PUBLIC_IP:=143.198.27.163}"
: "${GITEA_PORT:=3000}"
: "${TAILSCALE_TIMEOUT:=2}"
: "${GITEA_API_VERSION:=api/v1}"

# --- Detection Function ---
_detect_gitea_endpoint() {
    local tailscale_url="http://${TAILSCALE_IP}:${GITEA_PORT}/${GITEA_API_VERSION}"
    local public_url="http://${PUBLIC_IP}:${GITEA_PORT}/${GITEA_API_VERSION}"

    # Prefer Tailscale (private network) over public IP
    if curl -sf --connect-timeout "$TAILSCALE_TIMEOUT" \
        "${tailscale_url}/version" > /dev/null 2>&1; then
        echo "$tailscale_url"
        return 0
    else
        echo "$public_url"
        return 1
    fi
}

# --- Main Detection ---
# Set GITEA_BASE_URL for use by sourcing scripts
# Also sets GITEA_USING_TAILSCALE=true/false for scripts that need to know
if curl -sf --connect-timeout "$TAILSCALE_TIMEOUT" \
    "http://${TAILSCALE_IP}:${GITEA_PORT}/${GITEA_API_VERSION}/version" > /dev/null 2>&1; then
    GITEA_BASE_URL="http://${TAILSCALE_IP}:${GITEA_PORT}/${GITEA_API_VERSION}"
    GITEA_USING_TAILSCALE=true
else
    GITEA_BASE_URL="http://${PUBLIC_IP}:${GITEA_PORT}/${GITEA_API_VERSION}"
    GITEA_USING_TAILSCALE=false
fi

# Export for child processes
export GITEA_BASE_URL
export GITEA_USING_TAILSCALE

# Optional: log which endpoint was selected (set TAILSCALE_DEBUG=1 to enable)
if [[ "${TAILSCALE_DEBUG:-0}" == "1" ]]; then
    if [[ "$GITEA_USING_TAILSCALE" == "true" ]]; then
        echo "[tailscale-gitea] Using Tailscale endpoint: $GITEA_BASE_URL" >&2
    else
        echo "[tailscale-gitea] Tailscale unavailable, using public endpoint: $GITEA_BASE_URL" >&2
    fi
fi