#!/usr/bin/env luajit

math.randomseed(os.time())

local books = {
  read = 514,
  unread = 2682,
  per_calibre_page = 6,
}
books.total = books.read + books.unread

local ratings = {
  47, 51, 84, 76, 31
}
local average_rating = (function()
  local count, rating = 0, 0
  for i = 1, #ratings do
    count = count + ratings[i]
    rating = rating + ratings[i] * i
  end
  return rating / count
end)()

-- based on StoryGraph read, to-read, dnf, and owned stats
books.average_page_count = (90487 + 146938 + 14796 + 145380) / (434 + 419 + 59 + 668)
-- at time of coding, this estimated 113492 pages read, instead of the 90487 I actually read
-- this also doesn't have any way to account for many of those pages being not ebooks
-- so I'm adding an adjustment factor here to make estimates more accurate:
books.average_page_count = books.average_page_count / (113492/90487)
-- according to StoryGraph, 75% of my reading is ebooks, so I'm adding another adjustment:
books.average_page_count = books.average_page_count * 0.75
-- the calculated number here now PERFECTLY matches my read pages on StoryGraph, despite 17% print books..
-- so I guess I should do one more adjustment!
books.average_page_count = books.average_page_count * (1 - 0.17)

local function to_calibre_pages(count)
  return math.ceil(count / books.per_calibre_page)
end

local calibre_pages = {
  total = to_calibre_pages(books.total),
  read = to_calibre_pages(books.read),
  unread = to_calibre_pages(books.unread),
}
local calibre_links = {
  total = "https://calibre.tangentfox.com/page/",
  read = "https://calibre.tangentfox.com/read/stored/1/",
  unread = "https://calibre.tangentfox.com/unread/stored/1/",
}

local function open_random_links(_type, count)
  for i = 1, count do
    local page_number = math.random(calibre_pages[_type])
    os.execute("open \"" .. calibre_links[_type] .. page_number .. "\"")
    os.execute("sleep 1")
  end
end

local function estimate_pages(count)
  return math.floor(books.average_page_count * count)
end

print(books.total .. " books: " .. books.read .. " read (" .. string.format("%.2f", books.read / books.total * 100) .. "%), " .. books.unread .. " unread. Average rating: " .. string.format("%.2f", average_rating))
-- print("Calibre pages: " .. calibre_pages.total .. " pages. " .. calibre_pages.read .. " read pages, " .. calibre_pages.unread .. " unread pages.")
print("Estimated pages: " .. estimate_pages(books.total) .. " total, " .. estimate_pages(books.read) .. " read, " .. estimate_pages(books.unread) .. " unread.")
print("")
-- 2025's reading rate is 115.792 pages/day. Some pages are double-counted though, so I presume the 100/day rate is correct.
-- 2024's reading rate was 83.485 pages/day. Some were double-counted, and only part of the year is when I set a 100/day goal average.
print("In theory, it will take " .. string.format("%.1f", estimate_pages(books.unread) / 100 / 365) .. " years to read all unread books.")
print(" (Between " .. string.format("%.1f", estimate_pages(books.unread) / 116 / 365) .. " and " .. string.format("%.1f", estimate_pages(books.unread) / 83 / 365) .. " years.)")
print("")
print("Press enter to open 9 random pages on Calibre. :D Or close this window / Ctrl+C to skip that.")
io.read("*line")

open_random_links("unread", 9)