require "sinatra/base"
require "sinatra/json"
require_relative "lib/maptool/gpx"
require_relative "lib/maptool/gpx_store"

module Maptool
  class App < Sinatra::Base
    set :public_folder, File.join(__dir__, "public")
    set :views, File.join(__dir__, "views")

    OFFLINE_PMTILES_PATH = File.join(__dir__, "data", "offline.pmtiles")
    GPX_STORE = GpxStore.new(File.join(__dir__, "data", "gpx"))

    get "/" do
      erb :index
    end

    get "/api/health" do
      json status: "ok"
    end

    get "/api/offline-tiles" do
      json available: File.exist?(OFFLINE_PMTILES_PATH)
    end

    # Served as a plain range-request-capable file, not decoded server-side:
    # pmtiles.js reads the archive's directory and fetches only the byte
    # ranges it needs for the tiles currently on screen.
    get "/tiles/offline.pmtiles" do
      halt 404 unless File.exist?(OFFLINE_PMTILES_PATH)

      send_file OFFLINE_PMTILES_PATH, type: "application/octet-stream"
    end

    get "/api/gpx/tree" do
      json GPX_STORE.tree
    end

    post "/api/gpx" do
      file = params[:file]
      halt 400, json(error: "file is required") unless file && file[:tempfile]

      begin
        path = GPX_STORE.save(folder: params[:folder].to_s, filename: file[:filename], io: file[:tempfile])
      rescue GpxStore::InvalidPath
        halt 400, json(error: "invalid folder")
      end

      json path: path, tree: GPX_STORE.tree
    end

    get "/api/gpx/file/*" do
      begin
        path = GPX_STORE.resolve_file(params[:splat].first)
      rescue GpxStore::InvalidPath
        halt 400
      end
      halt 404 unless File.file?(path)

      begin
        json Gpx.to_geojson(path)
      rescue Gpx::ParseError
        halt 422, json(error: "could not parse GPX file")
      end
    end

    post "/api/gpx/folder" do
      begin
        GPX_STORE.create_folder(params[:path].to_s)
      rescue GpxStore::InvalidPath
        halt 400, json(error: "invalid path")
      end

      json tree: GPX_STORE.tree
    end

    delete "/api/gpx/file/*" do
      begin
        GPX_STORE.delete_file(params[:splat].first)
      rescue GpxStore::InvalidPath
        halt 400
      rescue Errno::ENOENT
        halt 404
      end

      json tree: GPX_STORE.tree
    end

    delete "/api/gpx/folder/*" do
      begin
        GPX_STORE.delete_folder(params[:splat].first)
      rescue GpxStore::InvalidPath
        halt 400
      rescue Errno::ENOENT
        halt 404
      end

      json tree: GPX_STORE.tree
    end

    post "/api/gpx/move" do
      begin
        path = GPX_STORE.move(from: params[:from].to_s, to_folder: params[:to_folder].to_s)
      rescue GpxStore::InvalidPath
        halt 400, json(error: "invalid path")
      rescue Errno::ENOENT
        halt 404
      end

      json path: path, tree: GPX_STORE.tree
    end
  end
end