-- half_to_full_katakana.lua

-- Convert half-width Katakana to full-width Katakana
local function half_to_full_katakana(text)
    print("Debug: Converting half-width Katakana to full-width Katakana...")
    local result = ""
    local dakuten = false
    for char in utf8.gmatch(text, ".") do
        local codepoint = utf8.codepoint(char)
        if codepoint == 0x3099 then -- Dakuten marker
            dakuten = true
            print("Debug: Found dakuten marker")
        elseif codepoint >= 0xFF61 and codepoint <= 0xFF9F then -- Half-width Katakana
            if dakuten then
                -- Convert half-width Katakana with dakuten to full-width
                if codepoint == 0xFF8A then -- ﾊ
                    result = result.. utf8.char(0x30CA) -- バ
                    print("Debug: Converted ﾊ to バ")
                elseif codepoint == 0xFF77 then -- き
                    result = result.. utf8.char(0x30B0) -- ギ
                    print("Debug: Converted き to ギ")
                elseif codepoint == 0xFF78 then -- く
                    result = result.. utf8.char(0x30B1) -- グ
                    print("Debug: Converted く to グ")
                elseif codepoint == 0xFF7C then -- し
                    result = result.. utf8.char(0x30B5) -- ジ
                    print("Debug: Converted し to ジ")
                elseif codepoint == 0xFF7D then -- す
                    result = result.. utf8.char(0x30B6) -- ズ
                    print("Debug: Converted す to ズ")
                elseif codepoint == 0xFF81 then -- ち
                    result = result.. utf8.char(0x30C1) -- チ
                    print("Debug: Converted ち to チ")
                elseif codepoint == 0xFF82 then -- つ
                    result = result.. utf8.char(0x30C4) -- ヅ
                    print("Debug: Converted つ to ヅ")
                elseif codepoint == 0xFF8B then -- ふ
                    result = result.. utf8.char(0x30D5) -- フ
                    print("Debug: Converted ふ to フ")
                elseif codepoint == 0xFF8D then -- へ
                    result = result.. utf8.char(0x30D8) -- ヘ
                    print("Debug: Converted へ to ヘ")
                elseif codepoint == 0xFF8E then -- ほ
                    result = result.. utf8.char(0x30DB) -- ホ
                    print("Debug: Converted ほ to ホ")
                else
                    result = result.. utf8.char(codepoint - 0xFF61 + 0x30A1)
                    print("Debug: Converted half-width Katakana to full-width Katakana")
                end
                dakuten = false
            else
                result = result.. utf8.char(codepoint - 0xFF61 + 0x30A1)
                print("Debug: Converted half-width Katakana to full-width Katakana")
            end
        else
            result = result.. char
            print("Debug: Copied non-Katakana character")
        end
    end
    print("Debug: Conversion complete")
    return result
end

-- Load the subtitle file
local sub_file = mp.get_property("sub-file")
if sub_file and sub_file ~= "" then
    if not io.open(sub_file, "r") then
        print("Error: Unable to open subtitle file")
        return
    end
    local subtitle_file = io.open(sub_file, "r")
    local subtitle_text = subtitle_file:read("*a")
    subtitle_file:close()

    -- Check if the subtitle text is empty
    if not subtitle_text or subtitle_text == "" then
        print("Error: Subtitle file is empty")
        return
    end

    -- Convert half-width Katakana to full-width Katakana
    local modified_text, err = pcall(half_to_full_katakana, subtitle_text)
    if not modified_text then
        print("Error: Conversion failed: ".. err)
        return
    end

    -- Set the modified