#!/bin/bash
set -e

# =============================================================================
# Gitea Docker Deploy Script
# Build multi-platform Docker image and push to Gitea container registry
# =============================================================================

# --- Load config from file if exists ---
CONFIG_FILE=".gitea-deploy"
if [[ -f "$CONFIG_FILE" ]]; then
    source "$CONFIG_FILE"
fi

# --- Configuration ---
# Priority: 1) environment variables, 2) .gitea-deploy file, 3) auto-detect
DOMAIN="${GITEA_DOMAIN:-$DOMAIN}"
REPO_PATH="${GITEA_REPO:-$REPO_PATH}"
PLATFORMS="${DOCKER_PLATFORMS:-${PLATFORMS:-linux/amd64,linux/arm64}}"
DOCKERFILE="${DOCKERFILE:-./Dockerfile}"

# --- Output colors ---
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

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

# --- Auto-detect from git remote ---
detect_gitea_info() {
    local remote_url
    local remote_name="${GIT_REMOTE:-}"

    # Priority: 1) GIT_REMOTE env, 2) remote "gitea", 3) remote "origin"
    if [[ -n "$remote_name" ]]; then
        remote_url=$(git remote get-url "$remote_name" 2>/dev/null || echo "")
    elif git remote get-url gitea &>/dev/null; then
        remote_name="gitea"
        remote_url=$(git remote get-url gitea)
        log_info "Using remote 'gitea'"
    else
        remote_name="origin"
        remote_url=$(git remote get-url origin 2>/dev/null || echo "")
    fi

    if [[ -z "$remote_url" ]]; then
        log_error "Git remote 'origin' not found"
        exit 1
    fi

    # Parse URL: support multiple formats
    # SSH short:  git@gitea.luulam.dev:luulam/9router.git
    # SSH full:   ssh://git@192.168.1.10:2222/luulam/9router.git
    # HTTPS:      https://gitea.luulam.dev/luulam/9router.git

    local detected_domain=""
    local detected_repo=""

    if [[ "$remote_url" =~ ^ssh:// ]]; then
        # SSH full format: ssh://git@host:port/path.git
        detected_domain=$(echo "$remote_url" | sed 's|ssh://[^@]*@\([^:/]*\).*|\1|')
        detected_repo=$(echo "$remote_url" | sed 's|ssh://[^/]*/\(.*\)\.git|\1|' | sed 's|\.git$||')
    elif [[ "$remote_url" =~ ^git@ ]]; then
        # SSH short format: git@host:path.git
        detected_domain=$(echo "$remote_url" | sed 's/git@\([^:]*\):.*/\1/')
        detected_repo=$(echo "$remote_url" | sed 's/git@[^:]*:\(.*\)\.git/\1/' | sed 's/\.git$//')
    elif [[ "$remote_url" =~ ^https?:// ]]; then
        # HTTPS format
        detected_domain=$(echo "$remote_url" | sed 's|https\?://\([^/]*\)/.*|\1|')
        detected_repo=$(echo "$remote_url" | sed 's|https\?://[^/]*/\(.*\)\.git|\1|' | sed 's/\.git$//')
    else
        log_error "Unrecognized git remote format: $remote_url"
        exit 1
    fi

    # Use detected values if not configured
    REPO_PATH="${REPO_PATH:-$detected_repo}"

    # Check if domain is IP -> need to configure DOMAIN
    if [[ -z "$DOMAIN" ]]; then
        if [[ "$detected_domain" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            log_error "Git remote points to IP ($detected_domain), not domain."
            log_error "Please create .gitea-deploy file with:"
            echo ""
            echo "  DOMAIN=\"gitea.luulam.dev\""
            echo "  REPO_PATH=\"$detected_repo\""
            echo ""
            exit 1
        fi
        DOMAIN="$detected_domain"
    fi
}

# --- Check prerequisites ---
check_prerequisites() {
    log_info "Checking prerequisites..."

    # Dockerfile
    if [[ ! -f "$DOCKERFILE" ]]; then
        log_error "$DOCKERFILE not found"
        exit 1
    fi

    # Docker daemon
    if ! docker info > /dev/null 2>&1; then
        log_error "Docker daemon not running. Please start Docker Desktop."
        exit 1
    fi

    # Docker buildx
    if ! docker buildx version > /dev/null 2>&1; then
        log_error "Docker Buildx not installed."
        log_info "Install with: docker buildx install"
        exit 1
    fi

    # Check if builder supports multi-platform
    local builder_platforms
    builder_platforms=$(docker buildx inspect --bootstrap 2>/dev/null | grep -i "platforms" || echo "")
    if [[ -z "$builder_platforms" ]]; then
        log_warn "Creating new multi-platform builder..."
        docker buildx create --use --name multiarch-builder --driver docker-container --bootstrap
    fi

    log_info "All prerequisites ready!"
}

# --- Build and Push ---
build_and_push() {
    local git_rev
    git_rev=$(git rev-parse --short HEAD)

    local image_base="$DOMAIN/$REPO_PATH"
    local tag_rev="$image_base:$git_rev"
    local tag_latest="$image_base:latest"

    echo ""
    log_info "=========================================="
    log_info "Build Docker Image"
    log_info "=========================================="
    log_info "Registry:   $DOMAIN"
    log_info "Repository: $REPO_PATH"
    log_info "Platforms:  $PLATFORMS"
    log_info "Tags:       $git_rev, latest"
    log_info "Dockerfile: $DOCKERFILE"
    echo ""

    # Build and push
    docker buildx build \
        --platform "$PLATFORMS" \
        --tag "$tag_rev" \
        --tag "$tag_latest" \
        --file "$DOCKERFILE" \
        --push .

    if [[ $? -eq 0 ]]; then
        echo ""
        log_info "=========================================="
        log_info "Deploy successful!"
        log_info "=========================================="
        log_info "Image: $tag_rev"
        log_info "Image: $tag_latest"
        echo ""
        log_info "Pull image:"
        echo "  docker pull $tag_latest"
        echo ""
    else
        log_error "Build failed!"
        exit 1
    fi
}

# --- Main ---
main() {
    echo ""
    log_info "Gitea Docker Deploy"
    echo ""

    # Detect info if not configured
    if [[ -z "$DOMAIN" ]] || [[ -z "$REPO_PATH" ]]; then
        detect_gitea_info
    fi

    check_prerequisites
    build_and_push
}

main "$@"