#!/bin/bash

# SPDX-FileCopyrightText: 2025 eden Emulator Project
# SPDX-License-Identifier: GPL-3.0-or-later

MESSAGE="
## Markdown documentation for current CMake options.
Generated with tools/generate-options-doc.sh automatically.


"

# Output file
OUTPUT_FILE="docs/build/build-options.md"

# Check if script is run from the root of the project (look for docs/ folder)
if [[ ! -d "docs" ]]; then
    echo "Warning: Not running from project root (docs/ folder not found)."
    echo "Markdown will not be generated."
else
    # Start Markdown file
    printf "%s\n" "$MESSAGE" > "$OUTPUT_FILE"

    # Process each CMakeLists.txt file
    find . -type f -iname 'CMakeLists.txt' | while IFS= read -r file; do
        options=""

        # Capture all options using grep
        while IFS= read -r line; do
            # Trim leading spaces
            line_trimmed=$(echo "$line" | sed 's/^[[:space:]]*//')

            # Match option() and CMAKE_DEPENDENT_OPTION()
            if [[ "$line_trimmed" =~ [Oo][Pp][Tt][Ii][Oo][Nn][_Dd]?[Ee]?[Pp]?[Ee]?[Nn]?[Dd]?[Ee]?[Nn]?[Tt]?_?[Oo]?[Pp]?[Tt]?[Ii]?[Oo]?[Nn]?\(([[:space:]]*[^[:space:]\)]+)[[:space:]]*\"([^\"]*)\"[[:space:]]*(.*)\) ]]; then
                name="${BASH_REMATCH[1]}"
                desc="${BASH_REMATCH[2]}"
                def="${BASH_REMATCH[3]}"
                # Escape pipe characters for Markdown
                desc=$(echo "$desc" | sed 's/|/\\|/g')
                def_value="$def"
                options+="$name|$desc|$def_value"$'\n'
            fi
        done < <(grep -i -E "option" "$file")

        # Only write header if options exist
        if [[ -n "$options" ]]; then
            {
                echo "## Options in $file"
                echo "| Name | Description | Default Value |"
                echo "|------|-------------|---------------|"

                # Sort by Default Value then Name
                echo "$options" | sort -t'|' -k3,3 -k1,1 | while IFS='|' read -r n d v; do
                    echo "| $n | $d | $v |"
                done

                echo
            } >> "$OUTPUT_FILE"
        fi
    done

    echo "Markdown $OUTPUT_FILE generated successfully."
fi