#!/bin/bash

# AI-Tr: Semantic text transformation tool
# Beautiful implementation using composable functions

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/ai-common"

show_usage() {
    cat << 'EOF'
Usage: ai-tr TRANSFORMATION [FILE...]
Transform text format or style while preserving semantic meaning.

Arguments:
  TRANSFORMATION   Description of the desired transformation

Options:
  -h              Show this help message
EOF
}

build_transformation_prompt() {
    local transformation="$1"
    
    cat << EOF
You are a semantic text transformation tool. Apply the following transformation: $transformation

CRITICAL REQUIREMENTS:
1. Preserve ALL semantic meaning and factual content
2. Keep the same essential information - do not add, remove, or change facts
3. Only change style, tone, format, or wording as requested
4. Maintain the original structure (same number of distinct points/items)
5. Output ONLY the transformed text - no explanations or commentary

Transform each line/paragraph separately to maintain structure.
EOF
}

main() {
    local transformation=""
    local files=()
    local input response
    
    # Parse options
    while getopts "h" opt; do
        case $opt in
            h) handle_help_option show_usage ;;
            \?) handle_invalid_option "$OPTARG" ;;
        esac
    done
    
    shift $((OPTIND-1))
    
    # Validate environment and arguments
    ensure_dependencies
    ensure_argument_provided "Transformation description" "$1" show_usage
    
    transformation="$1"
    shift
    files=("$@")
    
    # Validate files if provided
    [[ ${#files[@]} -gt 0 ]] && ensure_files_exist "${files[@]}"
    
    # Process input
    if ! input=$(process_input_sources "${files[@]}"); then
        exit "$EXIT_NO_MATCH"
    fi
    
    # Execute LLM request
    local prompt
    prompt=$(build_transformation_prompt "$transformation")
    
    if ! response=$(execute_llm_request "$prompt" "$input"); then
        case $? in
            "$EXIT_NO_MATCH") print_error "$(error_llm_no_response)" ;;
            "$EXIT_API_ERROR") print_error "$(error_llm_api_error)" ;;
            *) print_error "$(error_llm_command_failed)" ;;
        esac
        exit $?
    fi
    
    # Output response directly (no special processing needed for transformation)
    echo "$response"
    exit "$EXIT_SUCCESS"
}

main "$@"