#!/bin/bash
# =============================================================================
# Aula 13 - Container Factory (eStargz Images)
# =============================================================================
#
# Este script configura:
#   1. Namespace para deploy de imagens customizadas
#   2. Secrets e ConfigMaps
#   3. Instruções para criar repositório no Gitea
#
# Pré-requisitos:
#   - Cluster Kubernetes com Talos + stargz-snapshotter (aula-07/08)
#   - Gitea instalado (aula-10)
#   - Gitea Actions Runner (aula-10)
#
# =============================================================================

set -e

# Cores para output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
CYAN='\033[0;36m'
NC='\033[0m'

log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
log_success() { echo -e "${GREEN}[OK]${NC} $1"; }
log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1"; }

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ENV_FILE="${SCRIPT_DIR}/.env"

# =============================================================================
# VERIFICAR PRÉ-REQUISITOS
# =============================================================================

log_info "Verificando pré-requisitos..."

# Verificar kubectl
if ! command -v kubectl &> /dev/null; then
    log_error "kubectl não encontrado. Instale com: brew install kubectl"
    exit 1
fi

# Verificar conexão com cluster
if ! kubectl cluster-info &> /dev/null; then
    log_error "Não foi possível conectar ao cluster Kubernetes"
    log_info "Verifique se KUBECONFIG está configurado corretamente"
    exit 1
fi

# Verificar se Gitea está instalado
if ! kubectl get namespace gitea &> /dev/null; then
    log_error "Namespace 'gitea' não encontrado"
    log_info "Execute primeiro a aula-10 para instalar o Gitea"
    exit 1
fi

log_success "Pré-requisitos verificados"

# =============================================================================
# CARREGAR CONFIGURAÇÃO EXISTENTE
# =============================================================================

# Carregar configuração local PRIMEIRO (se existir)
if [[ -f "$ENV_FILE" ]]; then
    log_info "Carregando configuração local..."
    source "$ENV_FILE"
fi

# Se não tiver configuração local, tentar herdar da aula-10
if [[ -z "$DOMAIN" ]]; then
    AULA10_ENV="${SCRIPT_DIR}/../aula-10/.env"
    if [[ -f "$AULA10_ENV" ]]; then
        log_info "Herdando configuração da aula-10..."
        source "$AULA10_ENV"
    fi
fi

# =============================================================================
# COLETAR CONFIGURAÇÃO
# =============================================================================

echo ""
echo "=========================================="
echo "   Container Factory - eStargz Images"
echo "=========================================="
echo ""

# Domínio
if [[ -z "$DOMAIN" ]]; then
    read -p "Domínio base (ex: kube.quest): " DOMAIN
fi
log_info "Domínio: ${DOMAIN}"

GITEA_HOST="gitea.${DOMAIN}"

# Namespace para deploy
if [[ -z "$DEPLOY_NAMESPACE" ]]; then
    DEFAULT_NS="factory"
    read -p "Namespace para deploy [${DEFAULT_NS}]: " DEPLOY_NAMESPACE
    DEPLOY_NAMESPACE="${DEPLOY_NAMESPACE:-$DEFAULT_NS}"
fi
log_info "Namespace: ${DEPLOY_NAMESPACE}"

# Gerar senha PostgreSQL se não existir
if [[ -z "$POSTGRES_PASSWORD" ]]; then
    POSTGRES_PASSWORD=$(openssl rand -base64 24 | tr -dc 'a-zA-Z0-9' | head -c 24)
    log_info "Senha PostgreSQL gerada automaticamente"
fi

# Salvar configuração
cat > "$ENV_FILE" << EOF
# Configuração gerada pelo setup.sh - $(date)
DOMAIN=${DOMAIN}
GITEA_HOST=${GITEA_HOST}
DEPLOY_NAMESPACE=${DEPLOY_NAMESPACE}
POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
EOF

log_success "Configuração salva em ${ENV_FILE}"

# =============================================================================
# CRIAR NAMESPACE
# =============================================================================

echo ""
log_info "=== Criando Namespace ==="

kubectl create namespace ${DEPLOY_NAMESPACE} --dry-run=client -o yaml | kubectl apply -f -
log_success "Namespace ${DEPLOY_NAMESPACE} criado"

# =============================================================================
# CRIAR SECRET DO POSTGRESQL
# =============================================================================

log_info "Criando secret do PostgreSQL..."
kubectl create secret generic postgresql-secret \
    --namespace ${DEPLOY_NAMESPACE} \
    --from-literal=username=postgres \
    --from-literal=password="${POSTGRES_PASSWORD}" \
    --dry-run=client -o yaml | kubectl apply -f -
log_success "Secret postgresql-secret criado"

# =============================================================================
# CRIAR CONFIGMAP
# =============================================================================

log_info "Criando ConfigMap do PostgreSQL..."
kubectl apply -f "${SCRIPT_DIR}/k8s/postgresql/configmap.yaml" -n ${DEPLOY_NAMESPACE}
log_success "ConfigMap postgresql-config criado"

# =============================================================================
# INSTRUÇÕES PARA CRIAR REPOSITÓRIO
# =============================================================================

echo ""
echo "=========================================="
echo "   Próximos Passos"
echo "=========================================="
echo ""
echo -e "${CYAN}1. Criar organização 'factory' no Gitea:${NC}"
echo "   URL: https://${GITEA_HOST}/-/admin/orgs"
echo "   Nome: factory"
echo "   Visibilidade: Private"
echo ""
echo -e "${CYAN}2. Criar repositório 'postgresql' na org:${NC}"
echo "   URL: https://${GITEA_HOST}/repo/create"
echo "   Owner: factory"
echo "   Nome: postgresql"
echo ""
echo -e "${CYAN}3. Clonar e copiar os arquivos:${NC}"
echo ""
echo "   git clone git@${GITEA_HOST}:factory/postgresql.git"
echo "   cd postgresql"
echo "   cp ${SCRIPT_DIR}/images/postgresql/* ."
echo "   mkdir -p .gitea/workflows"
echo "   cp ${SCRIPT_DIR}/pipelines/postgresql/ci.yml .gitea/workflows/ci.yml"
echo ""
echo -e "${CYAN}4. Push inicial:${NC}"
echo ""
echo "   git add ."
echo "   git commit -m 'Initial commit: PostgreSQL factory image'"
echo "   git push -u origin main"
echo ""
echo -e "${CYAN}5. Aguardar pipeline (Gitea Actions):${NC}"
echo "   https://${GITEA_HOST}/factory/postgresql/actions"
echo ""
echo -e "${CYAN}6. Após pipeline completo, deploy no cluster:${NC}"
echo ""
echo "   kubectl apply -f ${SCRIPT_DIR}/k8s/postgresql/pvc.yaml -n ${DEPLOY_NAMESPACE}"
echo "   kubectl apply -f ${SCRIPT_DIR}/k8s/postgresql/deployment.yaml -n ${DEPLOY_NAMESPACE}"
echo "   kubectl apply -f ${SCRIPT_DIR}/k8s/postgresql/service.yaml -n ${DEPLOY_NAMESPACE}"
echo ""
echo "=========================================="
echo "   Credenciais PostgreSQL"
echo "=========================================="
echo "  Host: postgresql.${DEPLOY_NAMESPACE}.svc.cluster.local"
echo "  Port: 5432"
echo "  User: postgres"
echo "  Pass: ${POSTGRES_PASSWORD}"
echo "  DB:   app"
echo "=========================================="
echo ""
echo -e "${CYAN}7. Testar conexão:${NC}"
echo ""
echo "   kubectl run pg-client --rm -it --restart=Never \\"
echo "     --image=postgres:17-alpine \\"
echo "     --env=PGPASSWORD=${POSTGRES_PASSWORD} \\"
echo "     -- psql -h postgresql.${DEPLOY_NAMESPACE}.svc.cluster.local -U postgres -d app"
echo ""
echo "=========================================="
echo "   Container Registry (Gitea Packages)"
echo "=========================================="
echo ""
echo "   # Login"
echo "   docker login ${GITEA_HOST}"
echo ""
echo "   # Imagens são publicadas automaticamente pelo Gitea Actions"
echo "   # Após pipeline: ${GITEA_HOST}/factory/postgresql/packages"
echo ""
echo "=========================================="
echo "   Verificar Lazy Pulling (eStargz)"
echo "=========================================="
echo ""
echo "   # Ver tempo de startup do pod"
echo "   kubectl get pods -n ${DEPLOY_NAMESPACE} -w"
echo ""
echo "   # Ver logs do stargz-snapshotter (se tiver acesso ao node)"
echo "   talosctl -n <node-ip> logs stargz-snapshotter"
echo ""