#!/bin/bash
#
# Install Hindsight MCP server for Claude Desktop
#
# Usage:
#   curl -fsSL https://hindsight.vectorize.io/get-mcp | bash -s -- --app claude-desktop --set HINDSIGHT_API_LLM_API_KEY=YOUR_KEY
#
# Options:
#   --app              Required. Target application (currently only: claude-desktop)
#   --set ENV=VALUE    Set environment variable (can be repeated)
#
# Examples:
#   # With OpenAI
#   curl -fsSL https://hindsight.vectorize.io/get-mcp | bash -s -- \
#     --app claude-desktop \
#     --set HINDSIGHT_API_LLM_API_KEY=sk-...
#
#   # With Ollama (local LLM)
#   curl -fsSL https://hindsight.vectorize.io/get-mcp | bash -s -- \
#     --app claude-desktop \
#     --set HINDSIGHT_API_LLM_PROVIDER=ollama \
#     --set HINDSIGHT_API_LLM_MODEL=llama3.2
#
#   # With custom memory instructions
#   curl -fsSL https://hindsight.vectorize.io/get-mcp | bash -s -- \
#     --app claude-desktop \
#     --set HINDSIGHT_API_LLM_API_KEY=sk-... \
#     --set HINDSIGHT_API_MCP_INSTRUCTIONS="Also store every action you take and code you write."
#

set -e

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

print_info() {
    echo -e "${BLUE}ℹ${NC} $1"
}

print_success() {
    echo -e "${GREEN}✓${NC} $1"
}

print_error() {
    echo -e "${RED}✗${NC} $1"
    exit 1
}

print_warning() {
    echo -e "${YELLOW}⚠${NC} $1"
}

print_banner() {
    echo ""
    # ANSI logo
    echo -e "  \033[38;2;9;127;184m▄\033[0m\033[48;2;8;130;178m\033[38;2;5;133;186m▄\033[0m       \033[48;2;10;143;160m\033[38;2;10;143;165m▄\033[0m\033[38;2;7;140;156m▄\033[0m  "
    echo -e " \033[38;2;8;125;192m▄\033[0m \033[38;2;3;132;191m▀\033[0m\033[38;2;2;133;192m▄\033[0m \033[38;2;3;132;180m▄\033[0m\033[38;2;1;137;184m▄\033[0m\033[38;2;3;133;174m▄\033[0m \033[38;2;3;142;176m▄\033[0m\033[38;2;4;142;169m▀\033[0m \033[38;2;10;144;164m▄\033[0m "
    echo -e "\033[38;2;6;121;195m▀\033[0m\033[38;2;5;128;203m▀\033[0m\033[48;2;5;124;195m\033[38;2;3;125;200m▄\033[0m\033[38;2;2;126;196m▄\033[0m\033[48;2;3;128;188m\033[38;2;1;131;196m▄\033[0m\033[48;2;0;152;219m\033[38;2;2;131;191m▄\033[0m\033[38;2;1;141;196m▀\033[0m\033[38;2;1;135;183m▀\033[0m\033[38;2;1;148;198m▀\033[0m\033[48;2;1;156;202m\033[38;2;2;135;180m▄\033[0m\033[48;2;4;134;169m\033[38;2;1;137;177m▄\033[0m\033[38;2;3;138;173m▄\033[0m\033[48;2;6;137;165m\033[38;2;2;140;170m▄\033[0m\033[38;2;7;144;169m▀\033[0m\033[38;2;7;139;158m▀\033[0m"
    echo -e "   \033[48;2;2;128;202m\033[38;2;2;124;201m▄\033[0m\033[48;2;1;130;201m\033[38;2;0;135;212m▄\033[0m\033[38;2;2;128;196m▄\033[0m \033[48;2;2;142;204m\033[38;2;7;138;199m▄\033[0m \033[38;2;1;135;186m▄\033[0m\033[48;2;1;142;186m\033[38;2;2;144;194m▄\033[0m\033[48;2;3;138;176m\033[38;2;2;134;176m▄\033[0m   "
    echo -e " \033[48;2;8;118;200m\033[38;2;8;121;209m▄\033[0m\033[38;2;3;121;203m▀\033[0m \033[38;2;3;122;192m▀\033[0m\033[38;2;1;138;216m▀\033[0m\033[48;2;0;138;210m\033[38;2;3;128;198m▄\033[0m\033[48;2;0;126;188m\033[38;2;2;131;198m▄\033[0m\033[48;2;0;142;205m\033[38;2;3;132;193m▄\033[0m\033[38;2;1;140;196m▀\033[0m  \033[38;2;4;134;175m▀\033[0m\033[48;2;13;135;167m\033[38;2;8;136;174m▄\033[0m "
    echo ""
    echo -e "  ${BLUE}HINDSIGHT MCP INSTALLER${NC}"
    echo ""
}

# Parse arguments
APP=""
declare -a ENV_VARS=()

while [[ $# -gt 0 ]]; do
    case $1 in
        --app)
            APP="$2"
            shift 2
            ;;
        --set)
            ENV_VARS+=("$2")
            shift 2
            ;;
        -h|--help)
            echo "Usage: $0 --app <app> --set ENV=VALUE [--set ENV2=VALUE2 ...]"
            echo ""
            echo "Options:"
            echo "  --app              Required. Target application (currently only: claude-desktop)"
            echo "  --set ENV=VALUE    Set environment variable (can be repeated)"
            echo ""
            echo "Examples:"
            echo "  # With OpenAI"
            echo "  $0 --app claude-desktop --set HINDSIGHT_API_LLM_API_KEY=sk-..."
            echo ""
            echo "  # With Ollama (local LLM, no API key needed)"
            echo "  $0 --app claude-desktop --set HINDSIGHT_API_LLM_PROVIDER=ollama --set HINDSIGHT_API_LLM_MODEL=llama3.2"
            exit 0
            ;;
        *)
            print_error "Unknown option: $1. Use --help for usage."
            ;;
    esac
done

# Validate required arguments
if [ -z "$APP" ]; then
    print_error "Missing required argument: --app. Use --help for usage."
fi

if [ "$APP" != "claude-desktop" ]; then
    print_error "Unsupported app: $APP. Currently only 'claude-desktop' is supported."
fi

# Detect OS
detect_os() {
    case "$(uname -s)" in
        Darwin*)    echo "macos" ;;
        Linux*)     echo "linux" ;;
        MINGW*|MSYS*|CYGWIN*) echo "windows" ;;
        *)          echo "unknown" ;;
    esac
}

OS=$(detect_os)

# Get Claude Desktop config path based on OS
get_claude_config_path() {
    case "$OS" in
        macos)
            echo "$HOME/Library/Application Support/Claude/claude_desktop_config.json"
            ;;
        linux)
            echo "$HOME/.config/Claude/claude_desktop_config.json"
            ;;
        windows)
            echo "$APPDATA/Claude/claude_desktop_config.json"
            ;;
        *)
            print_error "Unsupported operating system: $OS"
            ;;
    esac
}

# Check if uvx is installed and return its path
find_uvx() {
    # Check if in PATH
    if command -v uvx &> /dev/null; then
        command -v uvx
        return 0
    fi

    # Check common installation paths
    local paths=(
        "$HOME/.local/bin/uvx"
        "$HOME/.cargo/bin/uvx"
        "/usr/local/bin/uvx"
    )

    for path in "${paths[@]}"; do
        if [ -f "$path" ]; then
            echo "$path"
            return 0
        fi
    done

    return 1
}

# Install uv (which includes uvx)
install_uv() {
    print_info "Installing uv..."

    if [ "$OS" = "windows" ]; then
        powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
    else
        curl -LsSf https://astral.sh/uv/install.sh | sh
    fi

    # Source the env to get uvx in path
    if [ -f "$HOME/.local/bin/env" ]; then
        source "$HOME/.local/bin/env"
    fi

    # Find uvx again
    if ! UVX_PATH=$(find_uvx); then
        print_error "uv installed but uvx not found. Please check your installation."
    fi

    print_success "uv installed successfully"
}

# Update Claude Desktop config
update_claude_config() {
    local config_path="$1"
    local uvx_path="$2"
    shift 2
    local env_vars=("$@")

    # Create config directory if it doesn't exist
    mkdir -p "$(dirname "$config_path")"

    # Check if jq is available (needed for both new and existing configs)
    if ! command -v jq &> /dev/null; then
        print_warning "jq not found. Installing..."
        if [ "$OS" = "macos" ]; then
            if command -v brew &> /dev/null; then
                brew install jq
            else
                print_error "Please install jq: brew install jq"
            fi
        elif [ "$OS" = "linux" ]; then
            if command -v apt-get &> /dev/null; then
                sudo apt-get install -y jq
            elif command -v yum &> /dev/null; then
                sudo yum install -y jq
            else
                print_error "Please install jq manually"
            fi
        fi
    fi

    # Build the env object from env_vars array
    local env_json="{}"
    for env_var in "${env_vars[@]}"; do
        local key="${env_var%%=*}"
        local value="${env_var#*=}"
        env_json=$(echo "$env_json" | jq --arg k "$key" --arg v "$value" '. + {($k): $v}')
    done

    # Build the hindsight server config
    local hindsight_config
    hindsight_config=$(jq -n \
        --arg uvx "$uvx_path" \
        --argjson env "$env_json" \
        '{
            "command": $uvx,
            "args": ["--from", "hindsight-api", "hindsight-local-mcp"],
            "env": $env
        }')

    # Check if config file exists and has content
    if [ -f "$config_path" ] && [ -s "$config_path" ]; then
        print_info "Updating existing Claude Desktop config..."

        # Backup existing config
        cp "$config_path" "${config_path}.backup"
        print_info "Backed up existing config to ${config_path}.backup"

        # Add or update hindsight server in existing config
        local new_config
        new_config=$(jq --argjson hs "$hindsight_config" '.mcpServers.hindsight = $hs' "$config_path")

        echo "$new_config" > "$config_path"
    else
        print_info "Creating new Claude Desktop config..."

        # Create new config with hindsight server
        local new_config
        new_config=$(jq -n --argjson hs "$hindsight_config" '{"mcpServers": {"hindsight": $hs}}')
        echo "$new_config" > "$config_path"
    fi

    print_success "Claude Desktop config updated: $config_path"
}

# Main installation flow
main() {
    print_banner

    print_info "App: $APP"
    if [ ${#ENV_VARS[@]} -gt 0 ]; then
        print_info "Environment variables: ${#ENV_VARS[@]} configured"
    fi
    echo ""

    # Step 1: Check/Install uvx
    print_info "Checking for uvx..."
    if UVX_PATH=$(find_uvx); then
        print_success "uvx found at: $UVX_PATH"
    else
        print_warning "uvx not found. Installing uv..."
        install_uv
        UVX_PATH=$(find_uvx)
    fi

    # Step 2: Update Claude Desktop config
    CONFIG_PATH=$(get_claude_config_path)
    print_info "Configuring Claude Desktop..."
    update_claude_config "$CONFIG_PATH" "$UVX_PATH" "${ENV_VARS[@]}"

    # Done!
    echo ""
    print_success "Installation complete!"
    echo ""
    print_info "Next steps:"
    echo "  1. Restart Claude Desktop"
    echo "  2. Look for the 'hindsight' tools (retain, recall) in Claude"
    echo ""
}

main "$@"