#!/usr/bin/env bash
# deploy.sh - Staged deployment framework for homelab nodes.
# Usage: ./deploy.sh [stage]

set -e

# --- Configuration ---
RUNTIME_PATH="/opt/homelab"
STATE_DIR="${RUNTIME_PATH}/state/deploy"
LOG_DIR="${RUNTIME_PATH}/logs/deploy"
REPO_PATH="${HOME}/homelab-codex-ws"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
LOG_FILE="${LOG_DIR}/deploy_${TIMESTAMP}.log"

# --- Initialization ---
mkdir -p "$STATE_DIR" "$LOG_DIR"

# Redirection for logging
exec > >(tee -a "$LOG_FILE") 2>&1

log() {
    echo "[$(date +'%Y-%m-%d %H:%M:%S')] $1"
}

set_state() {
    echo "$1" > "${STATE_DIR}/current_stage"
    log "State set to: $1"
}

get_state() {
    if [ -f "${STATE_DIR}/current_stage" ]; then
        cat "${STATE_DIR}/current_stage"
    else
        echo "none"
    fi
}

# --- Stages ---

stage_prepare() {
    log "Stage: PREPARE"
    set_state "prepare"
    # Skeleton: Pull latest changes, check dependencies, validate inventory
    log "Checking repository at $REPO_PATH..."
    cd "$REPO_PATH" && git pull
    log "Preparation complete."
}

stage_deploy() {
    log "Stage: DEPLOY"
    set_state "deploy"
    # Skeleton: Iterate through services and run docker compose
    log "Deploying services defined for $(hostname)..."
    # Implementation detail: loop through services/ and run compose
    log "Deployment complete."
}

stage_verify() {
    log "Stage: VERIFY"
    set_state "verify"
    # Skeleton: Check container status, healthchecks, connectivity
    log "Verifying service health..."
    docker ps
    log "Verification complete."
}

stage_diagnose() {
    log "Stage: DIAGNOSE"
    # Skeleton: Check logs, resource usage, networking
    log "Running diagnostics..."
    docker stats --no-stream
    log "Diagnostics complete."
}

stage_rollback() {
    log "Stage: ROLLBACK"
    # Skeleton: Revert to previous git commit or previous state
    log "Rolling back changes..."
    log "Rollback complete."
}

stage_resume() {
    log "Stage: RESUME"
    CURRENT=$(get_state)
    log "Resuming from state: $CURRENT"
    case "$CURRENT" in
        "prepare") stage_deploy ;;
        "deploy") stage_verify ;;
        "verify") log "Last deployment was verified. Nothing to resume." ;;
        *) log "Unknown state or nothing to resume. Starting from prepare..."; stage_prepare ;;
    esac
}

# --- Main ---

COMMAND=${1:-resume}

log "--- Homelab Deployment Started (Command: $COMMAND) ---"

case "$COMMAND" in
    prepare)  stage_prepare ;;
    deploy)   stage_deploy ;;
    verify)   stage_verify ;;
    diagnose) stage_diagnose ;;
    rollback) stage_rollback ;;
    resume)   stage_resume ;;
    *)        echo "Usage: $0 {prepare|deploy|verify|diagnose|rollback|resume}"; exit 1 ;;
esac

log "--- Homelab Deployment Finished ---"