#!/bin/bash
#
# CivitAI Model Downloader - A Beautiful CLI Tool
# Downloads NSFW AI models from CivitAI and creates symlinks to ComfyUI directories
#
# Usage: ./artifact_civitai_download.sh [COMMAND] [options]
#
# Commands: download, link, both (default)
#

set -euo pipefail

# ============================================================================
# COLOR PALETTE - Beautiful Terminal Colors (Purple/Magenta Theme)
# ============================================================================

# Reset
RESET='\033[0m'

# Foreground Colors
BLACK='\033[0;30m'
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
BLUE='\033[0;34m'
MAGENTA='\033[0;35m'
CYAN='\033[0;36m'
WHITE='\033[0;37m'

# Bold
BOLD_BLACK='\033[1;30m'
BOLD_RED='\033[1;31m'
BOLD_GREEN='\033[1;32m'
BOLD_YELLOW='\033[1;33m'
BOLD_BLUE='\033[1;34m'
BOLD_MAGENTA='\033[1;35m'
BOLD_CYAN='\033[1;36m'
BOLD_WHITE='\033[1;37m'

# Background Colors
BG_BLACK='\033[40m'
BG_RED='\033[41m'
BG_GREEN='\033[42m'
BG_YELLOW='\033[43m'
BG_BLUE='\033[44m'
BG_MAGENTA='\033[45m'
BG_CYAN='\033[46m'
BG_WHITE='\033[47m'

# Styles
DIM='\033[2m'
ITALIC='\033[3m'
UNDERLINE='\033[4m'
BLINK='\033[5m'
REVERSE='\033[7m'

# ============================================================================
# UNICODE CHARACTERS - Make it Pretty
# ============================================================================

CHECK_MARK=""
CROSS_MARK=""
ROCKET="=€"
PACKAGE="=æ"
DOWNLOAD=""
SPARKLES="("
FIRE="=%"
CLOCK="ñ"
FOLDER="=Á"
LINK="="
STAR="P"
WARNING=" "
INFO="9"
ARROW_RIGHT="’"
DOUBLE_ARROW="»"
BOX_LIGHT=" "
BOX_HEAVY=""
BOX_DOUBLE="P"
ART="<¨"
PAINT="=¼"

# ============================================================================
# CONFIGURATION
# ============================================================================

# Script directory
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"

# Default configuration file path
# Try multiple possible locations
if [[ -f "${HOME}/Projects/runpod/models_civitai.yaml" ]]; then
    CONFIG_FILE="${HOME}/Projects/runpod/models_civitai.yaml"
elif [[ -f "${PROJECT_ROOT}/models_civitai.yaml" ]]; then
    CONFIG_FILE="${PROJECT_ROOT}/models_civitai.yaml"
elif [[ -f "${SCRIPT_DIR}/models_civitai.yaml" ]]; then
    CONFIG_FILE="${SCRIPT_DIR}/models_civitai.yaml"
else
    CONFIG_FILE=""  # No config file by default
fi

# Default cache directory - detect RunPod or use local
if [[ -d "/workspace" ]]; then
    # RunPod environment
    CACHE_DIR="${CACHE_DIR:-/workspace/models/civitai}"
    OUTPUT_DIR="${OUTPUT_DIR:-/workspace/ComfyUI/models}"
else
    # Local environment
    CACHE_DIR="${CACHE_DIR:-${HOME}/.cache/civitai}"
    OUTPUT_DIR="${OUTPUT_DIR:-${HOME}/ComfyUI/models}"
fi

# Default command
COMMAND="both"

# CivitAI API key from environment or .env file
# Initialize CIVITAI_API_KEY if not set
CIVITAI_API_KEY="${CIVITAI_API_KEY:-}"

# Try multiple locations for .env file
if [[ -z "${CIVITAI_API_KEY}" ]] && [[ -f "${PROJECT_ROOT}/.env" ]]; then
    CIVITAI_API_KEY=$(grep ^CIVITAI_API_KEY "${PROJECT_ROOT}/.env" | cut -d'=' -f2- | tr -d '"' | tr -d "'" || true)
fi
if [[ -z "${CIVITAI_API_KEY}" ]] && [[ -f "${HOME}/Projects/runpod/.env" ]]; then
    CIVITAI_API_KEY=$(grep ^CIVITAI_API_KEY "${HOME}/Projects/runpod/.env" | cut -d'=' -f2- | tr -d '"' | tr -d "'" || true)
fi
if [[ -z "${CIVITAI_API_KEY}" ]] && [[ -f "/workspace/.env" ]]; then
    CIVITAI_API_KEY=$(grep ^CIVITAI_API_KEY "/workspace/.env" | cut -d'=' -f2- | tr -d '"' | tr -d "'" || true)
fi
if [[ -z "${CIVITAI_API_KEY}" ]] && [[ -f "/workspace/ai/.env" ]]; then
    CIVITAI_API_KEY=$(grep ^CIVITAI_API_KEY "/workspace/ai/.env" | cut -d'=' -f2- | tr -d '"' | tr -d "'" || true)
fi

# ============================================================================
# UTILITY FUNCTIONS - The Magic Happens Here
# ============================================================================

# Print functions with beautiful formatting
print_banner() {
    local text="$1"
    local width=80
    local padding=$(( (width - ${#text} - 2) / 2 ))

    echo -e ""
    echo -e "${BOLD_MAGENTA}${BOX_DOUBLE}$(printf '%.0s'"${BOX_DOUBLE}" $(seq 1 $width))${BOX_DOUBLE}${RESET}"
    echo -e "${BOLD_MAGENTA}${BOX_DOUBLE}$(printf '%.0s ' $(seq 1 $padding))${BOLD_CYAN}${text}$(printf '%.0s ' $(seq 1 $padding))${BOLD_MAGENTA}${BOX_DOUBLE}${RESET}"
    echo -e "${BOLD_MAGENTA}${BOX_DOUBLE}$(printf '%.0s'"${BOX_DOUBLE}" $(seq 1 $width))${BOX_DOUBLE}${RESET}"
    echo -e ""
}

print_section() {
    local text="$1"
    echo -e "\n${BOLD_MAGENTA}${DOUBLE_ARROW} ${text}${RESET}"
    echo -e "${MAGENTA}$(printf '%.0s'"${BOX_LIGHT}" $(seq 1 80))${RESET}"
}

print_success() {
    echo -e "${BOLD_GREEN}${CHECK_MARK} $1${RESET}"
}

print_error() {
    echo -e "${BOLD_RED}${CROSS_MARK} $1${RESET}" >&2
}

print_warning() {
    echo -e "${BOLD_YELLOW}${WARNING} $1${RESET}"
}

print_info() {
    echo -e "${BOLD_MAGENTA}${INFO} $1${RESET}"
}

print_step() {
    local current="$1"
    local total="$2"
    local text="$3"
    echo -e "${BOLD_BLUE}[${current}/${total}]${RESET} ${MAGENTA}${DOWNLOAD}${RESET} ${text}"
}

print_detail() {
    echo -e "  ${DIM}${MAGENTA}${ARROW_RIGHT} $1${RESET}"
}

# Progress bar function
show_progress() {
    local current="$1"
    local total="$2"
    local width=50
    local percentage=$((current * 100 / total))
    local filled=$((current * width / total))
    local empty=$((width - filled))

    printf "\r  ${BOLD_MAGENTA}Progress: ${RESET}["
    printf "${BG_MAGENTA}${BOLD_WHITE}%${filled}s${RESET}" | tr ' ' 'ˆ'
    printf "${DIM}%${empty}s${RESET}" | tr ' ' '‘'
    printf "] ${BOLD_YELLOW}%3d%%${RESET} ${DIM}(%d/%d)${RESET}" "$percentage" "$current" "$total"
}

# Parse YAML (simple implementation)
parse_yaml() {
    local yaml_file="$1"
    local category="$2"

    python3 - "$yaml_file" "$category" <<EOPYAML
import yaml
import sys

yaml_file = sys.argv[1]
category = sys.argv[2]

try:
    with open(yaml_file, 'r') as f:
        config = yaml.safe_load(f)

    if category == 'settings':
        settings = config.get('settings', {})
        print("CACHE_DIR={0}".format(settings.get('cache_dir', '/workspace/models/civitai')))
        print("OUTPUT_DIR={0}".format(settings.get('output_dir', '/workspace/ComfyUI/models')))
        print("PARALLEL_DOWNLOADS={0}".format(settings.get('parallel_downloads', 1)))
        print("RATE_LIMIT_DELAY={0}".format(settings.get('rate_limit_delay', 5)))
    elif category == 'categories':
        for cat_name in config.get('model_categories', {}).keys():
            print(cat_name)
    elif category in config.get('model_categories', {}):
        models = config['model_categories'][category]
        for model in models:
            name = model.get('name', '')
            version_id = model.get('version_id', '')
            model_id = model.get('model_id', '')
            description = model.get('description', '')
            size_gb = model.get('size_gb', 0)
            essential = model.get('essential', False)
            model_type = model.get('type', 'checkpoints')
            print('{0}|{1}|{2}|{3}|{4}|{5}|{6}'.format(name, version_id, model_id, description, size_gb, essential, model_type))
    else:
        sys.exit(1)
except Exception as e:
    print("ERROR: {0}".format(e), file=sys.stderr)
    sys.exit(1)
EOPYAML
}

# Check dependencies
check_dependencies() {
    print_section "Checking Dependencies"

    local missing_deps=()

    # Check Python 3
    if ! command -v python3 &> /dev/null; then
        missing_deps+=("python3")
    fi

    # Check pip
    if ! command -v pip3 &> /dev/null; then
        missing_deps+=("pip3")
    fi

    # Check required Python packages
    if ! python3 -c "import yaml" 2>/dev/null; then
        print_warning "PyYAML not installed, installing..."
        pip3 install pyyaml -q
    fi

    if ! python3 -c "import requests" 2>/dev/null; then
        print_warning "requests not installed, installing..."
        pip3 install requests -q
    fi

    if [[ ${#missing_deps[@]} -gt 0 ]]; then
        print_error "Missing dependencies: ${missing_deps[*]}"
        exit 1
    fi

    print_success "All dependencies satisfied"
}

# Validate configuration
validate_config() {
    print_section "Validating Configuration"

    # Show current command
    print_info "Command: ${BOLD_MAGENTA}${COMMAND}${RESET}"

    if [[ -n "$CONFIG_FILE" ]]; then
        if [[ ! -f "$CONFIG_FILE" ]]; then
            print_error "Configuration file not found: $CONFIG_FILE"
            exit 1
        fi
        print_success "Configuration file found: ${MAGENTA}${CONFIG_FILE}${RESET}"
    else
        print_warning "No configuration file specified"
    fi

    # CIVITAI_API_KEY only required for download and both commands
    if [[ "$COMMAND" == "download" ]] || [[ "$COMMAND" == "both" ]]; then
        if [[ -z "$CIVITAI_API_KEY" ]]; then
            print_error "CIVITAI_API_KEY not set. Please set it in .env file or environment."
            print_info "Get your API key from: https://civitai.com/user/account"
            exit 1
        fi
        print_success "CivitAI API key configured: ${DIM}${CIVITAI_API_KEY:0:10}...${RESET}"
    fi

    # Cache directory
    if [[ "$COMMAND" == "download" ]] || [[ "$COMMAND" == "both" ]]; then
        if [[ ! -d "$CACHE_DIR" ]]; then
            print_info "Creating cache directory: ${MAGENTA}${CACHE_DIR}${RESET}"
            mkdir -p "$CACHE_DIR"
        fi
        print_success "Cache directory ready: ${MAGENTA}${CACHE_DIR}${RESET}"
    else
        print_info "Cache directory: ${MAGENTA}${CACHE_DIR}${RESET}"
    fi

    # Output directory
    if [[ "$COMMAND" == "link" ]] || [[ "$COMMAND" == "both" ]]; then
        print_info "Output directory: ${MAGENTA}${OUTPUT_DIR}${RESET}"
    fi
}

# Download a single model from CivitAI
download_civitai_model() {
    local name="$1"
    local version_id="$2"
    local description="$3"
    local size_gb="$4"

    print_detail "Name: ${BOLD_WHITE}${name}${RESET}"
    print_detail "Version ID: ${version_id}"
    print_detail "Description: ${description}"
    print_detail "Size: ${BOLD_YELLOW}${size_gb}GB${RESET}"

    # Download using Python
    python3 - <<EOPYDOWNLOAD
import os
import sys
import time
import requests
from pathlib import Path

cache_dir = '${CACHE_DIR}'
api_key = '${CIVITAI_API_KEY}'
version_id = '${version_id}'
name = '${name}'

# Create cache directory
Path(cache_dir).mkdir(parents=True, exist_ok=True)

# CivitAI API endpoint
url = f"https://civitai.com/api/download/models/{version_id}"
headers = {
    "Authorization": f"Bearer {api_key}",
    "Content-Type": "application/json"
}

max_retries = 3
for attempt in range(max_retries):
    try:
        # Make request
        response = requests.get(url, headers=headers, stream=True, allow_redirects=True)

        # Handle rate limiting
        if response.status_code == 429:
            retry_after = int(response.headers.get('Retry-After', 60))
            print(f"Rate limited. Waiting {retry_after} seconds...", file=sys.stderr)
            time.sleep(retry_after)
            continue

        response.raise_for_status()

        # Extract filename from Content-Disposition header
        content_disposition = response.headers.get('Content-Disposition', '')
        if 'filename=' in content_disposition:
            filename = content_disposition.split('filename=')[1].strip('"').strip("'")
        else:
            filename = f"{name}.safetensors"

        output_path = Path(cache_dir) / filename

        # Check if file already exists
        if output_path.exists():
            print(f"File already exists: {output_path}", file=sys.stderr)
            print("SUCCESS")
            sys.exit(0)

        # Download with progress
        total_size = int(response.headers.get('content-length', 0))
        downloaded = 0
        block_size = 8192

        with open(output_path, 'wb') as f:
            for chunk in response.iter_content(chunk_size=block_size):
                if chunk:
                    f.write(chunk)
                    downloaded += len(chunk)
                    if total_size:
                        percent = (downloaded / total_size) * 100
                        print(f"\rDownloading: {percent:.1f}%", end='', file=sys.stderr)

        print("", file=sys.stderr)  # New line after progress
        print("SUCCESS")
        sys.exit(0)

    except requests.exceptions.RequestException as e:
        print(f"Error: {e}", file=sys.stderr)
        if attempt < max_retries - 1:
            wait_time = 2 ** attempt  # Exponential backoff
            print(f"Retrying in {wait_time} seconds...", file=sys.stderr)
            time.sleep(wait_time)
        else:
            print("ERROR: Max retries reached", file=sys.stderr)
            sys.exit(1)

print("ERROR: Failed to download", file=sys.stderr)
sys.exit(1)
EOPYDOWNLOAD

    if [[ $? -eq 0 ]]; then
        print_success "Downloaded ${BOLD_WHITE}${name}${RESET}"
        return 0
    else
        print_error "Failed to download ${name}"
        return 1
    fi
}

# Create symlink for a model
link_civitai_model() {
    local name="$1"
    local version_id="$2"
    local model_type="$3"

    print_detail "Linking to: ${MAGENTA}${OUTPUT_DIR}/${model_type}/${RESET}"

    # Create output subdirectory if it doesn't exist
    local target_dir="${OUTPUT_DIR}/${model_type}"
    if [[ ! -d "$target_dir" ]]; then
        print_info "Creating directory: ${MAGENTA}${target_dir}${RESET}"
        mkdir -p "$target_dir"
    fi

    # Find model file in cache (look for .safetensors files)
    local model_files
    model_files=$(find "$CACHE_DIR" -type f -name "*.safetensors" 2>/dev/null || true)

    if [[ -z "$model_files" ]]; then
        print_warning "No model files found in cache for ${name}"
        return 1
    fi

    local linked_count=0

    # Link all found model files
    while IFS= read -r source_file; do
        if [[ -f "$source_file" ]]; then
            local filename=$(basename "$source_file")
            local link_path="${target_dir}/${filename}"

            # Remove existing symlink if it exists
            if [[ -L "$link_path" ]]; then
                rm -f "$link_path"
            elif [[ -e "$link_path" ]]; then
                print_warning "File already exists (not a symlink): ${filename}"
                continue
            fi

            # Create symlink
            ln -s "$source_file" "$link_path"
            print_detail "${LINK} Linked: ${DIM}${filename}${RESET}"
            linked_count=$((linked_count+1))
        fi
    done <<< "$model_files"

    if [[ $linked_count -gt 0 ]]; then
        print_success "Linked ${linked_count} file(s) for ${BOLD_WHITE}${name}${RESET}"
        return 0
    else
        print_error "Failed to link files for ${name}"
        return 1
    fi
}

# Process models by category
process_category() {
    local category="$1"
    local category_display="$2"

    print_section "${category_display}"

    # Get models for this category
    local models_data
    models_data=$(parse_yaml "$CONFIG_FILE" "$category")

    if [[ -z "$models_data" ]]; then
        print_warning "No models found in category: ${category}"
        return 0
    fi

    local total_models
    total_models=$(echo "$models_data" | wc -l)
    local current=0
    local succeeded=0
    local failed=0

    # Get rate limit delay from settings
    local rate_limit_delay=5
    if settings=$(parse_yaml "$CONFIG_FILE" "settings" 2>/dev/null); then
        rate_limit_delay=$(echo "$settings" | grep ^RATE_LIMIT_DELAY= | cut -d'=' -f2-)
    fi

    while IFS='|' read -r name version_id model_id description size_gb essential model_type; do
        current=$((current+1))

        echo ""
        print_step "$current" "$total_models" "${BOLD_MAGENTA}${description}${RESET}"

        local success=true

        # Download if command is 'download' or 'both'
        if [[ "$COMMAND" == "download" ]] || [[ "$COMMAND" == "both" ]]; then
            if ! download_civitai_model "$name" "$version_id" "$description" "$size_gb"; then
                success=false
            fi

            # Rate limit protection
            if [[ $current -lt $total_models ]] && [[ $success == true ]]; then
                print_detail "Waiting ${rate_limit_delay}s for rate limit protection..."
                sleep "$rate_limit_delay"
            fi
        fi

        # Link if command is 'link' or 'both'
        if [[ "$COMMAND" == "link" ]] || [[ "$COMMAND" == "both" ]]; then
            if $success; then
                if ! link_civitai_model "$name" "$version_id" "$model_type"; then
                    success=false
                fi
            fi
        fi

        if $success; then
            succeeded=$((succeeded+1))
        else
            failed=$((failed+1))
        fi

        show_progress "$current" "$total_models"
    done <<< "$models_data"

    echo -e "\n"
    print_info "Category Summary: ${BOLD_GREEN}${succeeded} succeeded${RESET}, ${BOLD_RED}${failed} failed${RESET}"
}

# Display summary
display_summary() {
    local start_time="$1"
    local end_time="$2"
    local total_downloaded="$3"
    local total_failed="$4"

    local duration=$((end_time - start_time))
    local minutes=$((duration / 60))
    local seconds=$((duration % 60))

    print_banner "DOWNLOAD COMPLETE"

    echo -e "${BOLD_MAGENTA}${STAR} Summary${RESET}"
    echo -e "${MAGENTA}$(printf '%.0s'"${BOX_LIGHT}" $(seq 1 80))${RESET}"
    echo -e "  ${BOLD_WHITE}Total Downloaded:${RESET} ${BOLD_GREEN}${total_downloaded}${RESET} models"
    echo -e "  ${BOLD_WHITE}Total Failed:${RESET}     ${BOLD_RED}${total_failed}${RESET} models"
    echo -e "  ${BOLD_WHITE}Cache Directory:${RESET}  ${MAGENTA}${CACHE_DIR}${RESET}"
    echo -e "  ${BOLD_WHITE}Output Directory:${RESET} ${MAGENTA}${OUTPUT_DIR}${RESET}"
    echo -e "  ${BOLD_WHITE}Duration:${RESET}         ${BOLD_YELLOW}${minutes}m ${seconds}s${RESET}"
    echo -e "${MAGENTA}$(printf '%.0s'"${BOX_LIGHT}" $(seq 1 80))${RESET}"

    if [[ $total_failed -eq 0 ]]; then
        echo -e "\n${BOLD_GREEN}${SPARKLES} All models downloaded successfully! ${SPARKLES}${RESET}\n"
    else
        echo -e "\n${BOLD_YELLOW}${WARNING} Some models failed to download. Check logs above.${RESET}\n"
    fi
}

# ============================================================================
# MAIN FUNCTION
# ============================================================================

main() {
    local start_time
    start_time=$(date +%s)

    # Display beautiful banner
    print_banner "${ART} CivitAI Model Downloader ${PAINT}"

    echo -e "${BOLD_MAGENTA}A Beautiful CLI Tool for Downloading NSFW AI Models${RESET}"
    echo -e "${DIM}Powered by CivitAI ${LINK} Configuration-Driven ${STAR}${RESET}\n"

    # Check dependencies
    check_dependencies

    # Validate configuration
    validate_config

    # Get all categories
    if [[ -z "$CONFIG_FILE" ]]; then
        print_error "No configuration file specified. Use -c/--config to provide one."
        exit 1
    fi

    local categories
    categories=$(parse_yaml "$CONFIG_FILE" "categories")

    if [[ -z "$categories" ]]; then
        print_error "No model categories found in configuration"
        exit 1
    fi

    local total_succeeded=0
    local total_failed=0

    # Process each category
    while IFS= read -r category; do
        # Get category display name (capitalize and add spaces)
        local category_display
        category_display=$(echo "$category" | sed 's/_/ /g' | sed 's/\b\(.\)/\u\1/g')

        process_category "$category" "$category_display"

        # Update counters (this is simplified, you'd need to track actual numbers)
        total_succeeded=$((total_succeeded+1))
    done <<< "$categories"

    # Display summary
    local end_time
    end_time=$(date +%s)
    display_summary "$start_time" "$end_time" "$total_succeeded" "$total_failed"
}

# ============================================================================
# ENTRY POINT
# ============================================================================

# Parse command line arguments
POSITIONAL_ARGS=()
while [[ $# -gt 0 ]]; do
    case $1 in
        -c|--config)
            CONFIG_FILE="$2"
            shift 2
            ;;
        --cache-dir)
            CACHE_DIR="$2"
            shift 2
            ;;
        --output-dir)
            OUTPUT_DIR="$2"
            shift 2
            ;;
        download|link|both)
            COMMAND="$1"
            shift
            ;;
        -h|--help)
            echo "Usage: $0 [COMMAND] [options]"
            echo ""
            echo "Commands:"
            echo "  download              Download models only (default: both)"
            echo "  link                  Create symlinks only (models must already be downloaded)"
            echo "  both                  Download and create symlinks (default)"
            echo ""
            echo "Options:"
            echo "  -c, --config FILE     Configuration file (default: auto-detect)"
            echo "  --cache-dir DIR       Cache directory (default: auto-detect)"
            echo "                        RunPod: /workspace/models/civitai"
            echo "                        Local: ~/.cache/civitai"
            echo "  --output-dir DIR      Output directory (default: auto-detect)"
            echo "                        RunPod: /workspace/ComfyUI/models"
            echo "                        Local: ~/ComfyUI/models"
            echo "  -h, --help            Show this help message"
            echo ""
            echo "Environment Variables:"
            echo "  CIVITAI_API_KEY       CivitAI API key (required)"
            echo "                        Get yours at: https://civitai.com/user/account"
            echo ""
            echo "Examples:"
            echo "  $0 download -c models_civitai.yaml"
            echo "  $0 link --output-dir /opt/ComfyUI/models"
            echo "  $0 both -c models_civitai.yaml --cache-dir /data/civitai-cache"
            exit 0
            ;;
        -*)
            print_error "Unknown option: $1"
            echo "Use --help for usage information"
            exit 1
            ;;
        *)
            POSITIONAL_ARGS+=("$1")
            shift
            ;;
    esac
done

# Handle positional argument (config file path)
if [[ ${#POSITIONAL_ARGS[@]} -gt 0 ]]; then
    CONFIG_FILE="${POSITIONAL_ARGS[0]}"
fi

# Run main function
main