local dt = require "darktable"
local du = require "lib/dtutils"

du.check_min_api_version("7.0.0", "lightgallery_export_module")

local gettext = dt.gettext.gettext
local function _(msgid)
    return gettext(msgid)
end

local script_data = {}

script_data.metadata = {
    name = "lightgallery_export_module",
    purpose = _("Export selected files into a directory and call a python script to create a lightGallery"),
    author = "Markus Spring",
    help = "https://gogs.hermes.markus-spring.info/springm/darktable_to_lightgallery"
}

-- local variables
local help_url = "https://gogs.hermes.markus-spring.info/springm/darktable_to_lightgallery"
local du = require "lib/dtutils"
local df = require "lib/dtutils.file"
local dtsys = require "lib/dtutils.system"
local debug = require "darktable.debug"

local image_max_xy = 2500
local jpg_quality_str = '92'
local PS = dt.configuration.running_os == "windows" and "\\" or "/"

script_data.destroy = nil -- function to destory the script
script_data.destroy_method = nil -- set to hide for libs since we can't destroy them commpletely yet, otherwise leave as nil
script_data.restart = nil -- how to restart the (lib) script after it's been hidden - i.e. make it visible again

-- Register preferences
dt.preferences.register("lightgallery_export", "export_path", "string",
                        "LightGallery Export Path", "Path to export lightGallery", "")
dt.preferences.register("lightgallery_export", "gallery_title", "string",
                        "LightGallery Title", "Title for the lightGallery", "--..--")
dt.preferences.register("lightgallery_export", "gallery_uplink", "string",
                        "LightGallery Uplink", "Uplink for lightGallery index.html", "..")
-- dt.preferences.register("lightgallery_export", "gallery_family_tags", "bool", "LightGallery attach published..family tag", "attach published..family tag", false)
dt.preferences.register("lightgallery_export", "gallery_tag", "string",
                        "LightGallery attach published|gallery|<name> tag", "attach published|gallery|<name> tag", "family")
dt.preferences.register("lightgallery_export", "exiftoolbinary", "file",
                        _("lightGallery: executable for exiftool"), 
                        _("select executable for exiftool command line version")  , "")
dt.preferences.register("lightgallery_export", "post_export_script", "file", 
                        _("lightGallery: select script to run after image export"), 
                        _("select script to run after image export")  , "")

function mws_basename(str)
   local name = string.gsub(str, "(.*)%..*", "%1")
   return name
end

function exists(name)
   if type(name)~="string" then return false end
   return os.rename(name,name) and true or false
end

function isFile(name)
   if type(name)~="string" then return false end
   if not exists(name) then return false end
   local f = io.open(name)
   if f then
      f:close()
      return true
   end
   return false
end

function isDir(name)
   return (exists(name) and not isFile(name))
end

local export_path_widget = dt.new_widget("file_chooser_button") {
   title = "Select export path",
   is_directory = true,
   tooltip = "Choose the directory where to export the images for the lightGallery",
   value = dt.preferences.read("lightgallery_export", "export_path", "string")
}
local export_path_widget_box = dt.new_widget("box") {
    orientation = "horizontal",
    dt.new_widget("label") {
        label = "Verzeichnis: "
    },
    export_path_widget
}

local gallery_title_widget = dt.new_widget("entry") {
   text = dt.preferences.read("lightgallery_export", "gallery_title", "string"),
   tooltip = "Enter the title for the lightGallery"
}

local gallery_title_widget_box = dt.new_widget("box") {
    orientation = "horizontal",
    dt.new_widget("label") {
        label = "Titel: "
    },
    gallery_title_widget
}

local gallery_uplink_widget = dt.new_widget("entry") {
   text = dt.preferences.read("lightgallery_uplink", "gallery_uplink", "string"),
   tooltip = "Uplink for the lightGallery index.html"
}

local gallery_uplink_widget_box = dt.new_widget("box") {
    orientation = "horizontal",
    dt.new_widget("label") {
        label = "Uplink: "
    },
    gallery_uplink_widget
}

local gallery_tag_widget = dt.new_widget("entry") {
   text = dt.preferences.read("lightgallery_export", "gallery_tag", "string")
}

local gallery_tag_widget_box = dt.new_widget("box") {
    orientation = "horizontal",
    dt.new_widget("label") {
        label = "photography|published|gallery Tag: "
    },
    gallery_tag_widget
}

-- Function to save preferences
local function save_preferences()
    dt.preferences.write("lightgallery_export", "export_path", "string", export_path_widget.value)
    dt.preferences.write("lightgallery_export", "gallery_title", "string", gallery_title_widget.text)
    dt.preferences.write("lightgallery_export", "lightgallery_uplink", "string", gallery_uplink_widget.text)
    dt.preferences.write("lightgallery_export", "gallery_tag", "string", gallery_tag_widget.text)
end

-- Function to check if a string is not empty
local function is_not_empty(s)
    return s ~= "" and s ~= nil
end

local function run_post_export_script(exp_path)
   title = dt.preferences.read("lightgallery_export", "gallery_title", "string")
   if title == "" then
      title = "n.n"
   end
   uplink = dt.preferences.read("lightgallery_export", "lightgallery_uplink", "string")
   if uplink == "" then
      uplink = ".."
   end
   local post_export_script = dt.preferences.read("lightgallery_export", "post_export_script", "file")
   dt.print_log( "post_export_script: ".. post_export_script.." -t '"..title.."' -u '"..uplink.."' "..exp_path )
   os.execute( post_export_script.." -t '"..title.."' -u '"..uplink.."' "..exp_path ) 
end

-- Function to export images to Light Gallery
local function export_to_lightgallery()
    local exp_path = export_path_widget.value
    local gallery_title = gallery_title_widget.text
    local exiftool = dt.preferences.read("lightgallery_export", "exiftoolbinary", "file")

    -- Save preferences
    save_preferences()

    -- Create the export directory if it doesn't exist
    os.execute("mkdir -p " .. exp_path)

    local jpeg_exporter      = dt.new_format("jpeg")
    jpeg_exporter.quality = jpg_quality_str
    jpeg_exporter.max_height = image_max_xy
    jpeg_exporter.max_width  = image_max_xy
    
    -- Loop over the selected images
    local images = dt.gui.selection()
    for _, i in ipairs(images) do
        local tmpname = os.tmpname()
        local tmp_exported = tmpname..".jpg"
        if dt.configuration.running_os == "windows" then
           tmp_exported = dt.configuration.tmp_dir .. tmp_exported -- windows os.tmpname() defaults to root directory
        end
        if i.rating < 2 then
           i.rating = 2
        end
        dt.print("Exporting "..i.filename)
        jpeg_exporter:write_image(i, tmp_exported, false)
        run_cmd = exiftool..' -TagsFromFile '..df.sanitize_filename(i.sidecar)..' -xmp:all -exif:all --subifd:all -overwrite_original '..df.sanitize_filename(tmp_exported)
        dt.print_log(string.format("Running: %s", run_cmd))
        resp = dtsys.external_command(run_cmd)
        targetfile = df.sanitize_filename(string.gsub(exp_path, "'", "")..PS..mws_basename(i.filename)..'.jpg')
        dt.print('mv ' .. tmp_exported .. ' ' .. targetfile)
        os.execute('mv ' .. tmp_exported .. ' ' .. targetfile)
        tag = dt.preferences.read("lightgallery_export", "gallery_tag", "string")
        if is_not_empty(tag) then
           tag = 'photography|published|gallery|'..tag
           tnr = dt.tags.find(tag)
           if not tnr then
              tnr = dt.tags.create(tag)
           end
           dt.tags.attach(tnr,i)
        end
        os.execute( "rm -f " .. tmpname )        
    end
    run_post_export_script(exp_path)
    dt.print("Exported " .. #images .. " images to lightGallery")
end

-- Create export button
local gallery_export_button = dt.new_widget("button"){
    label = "Run Export",
    clicked_callback = export_to_lightgallery
}

-- Create a button widget with a help link
local help_button = dt.new_widget("button"){
    label = "Help/Documentation",
    clicked_callback = function()
        -- Open the help URL in the default web browser
        dt.control.execute("xdg-open "..help_url)
    end
}

-- Create the module widget
local module_widget = dt.new_widget("box"){
    orientation = "vertical",
    gallery_title_widget_box,
    export_path_widget_box,
    gallery_uplink_widget_box,
    gallery_tag_widget_box,
    gallery_export_button,
    help_button
}

-- Register the module
dt.register_lib(
    "lightgallery_export_module",
    "lightGallery Export",
    true,
    false,
    {
        [dt.gui.views.lighttable] = {"DT_UI_CONTAINER_PANEL_RIGHT_CENTER", 100},
    },
    module_widget
)

script_data.destroy = nil
script_data.destroy_method = nil

return script_data