--[[
Implements extracting the database to an archive file, you probably want a cron
job for this.

# Generates the archive
lua tools/archive/main.lua
]]
local sql = require("lsqlite3")
local argparse = require("argparse")
local zlib = require("zlib")
local etlua = require("etlua")
local crc32 = require("tools.archive.crc32")

local parser = argparse(){
	name = "tools/archive/main.lua",
	description = "Generate a downloadable zip archive.",
	epilog = "Other tools included in the smr source distribution include:accounts",
}
parser:help_max_width(80)
parser:option("-d --database","The database file","kore_chroot/data/posts.db")
parser:option("-o --output","Output to directory","kore_chroot/data/archive")

args = parser:parse()
local db,err,errmsg = sql.open(args.database, sql.OPEN_READWRITE)
local outfile = io.open(args.output,"w")
if not db then
	error(string.format("Failed to open %s : %s",args.database,errmsg))
end

local index_f = assert(io.open("tools/archive/main.etlua"))
local index_tmpl = assert(index_f:read("*a"))
index_f:close()
local template_main = etlua.compile(index_tmpl)

local story_f = assert(io.open("tools/archive/story.etlua"))
story_tmpl = assert(story_f:read("*a"))
story_f:close()
local template_story = etlua.compile(story_tmpl)
local zipped_files = {}
for row in db:rows([[
	SELECT
		posts.id,
		posts.post_text,
		posts.post_title,
		authors.name,
		posts.isanon,
		posts.post_time,
		GROUP_CONCAT(tags.tag,";")
	FROM posts, authors
	LEFT JOIN tags ON tags.postid = posts.id
	WHERE
		posts.authorid = authors.id AND
		posts.unlisted = 0
	GROUP BY posts.id
	ORDER BY posts.post_time
]]) do
	local id, text, title, author, isanon, post_time, tags_txt = unpack(row)
	local tags_txt = (tags_txt or "") .. ";"
	local tags = {}
	for tag in tags_txt:gmatch("([^;]+)") do
		table.insert(tags,tag)
	end
	local story_txt = zlib.decompress(text)
	local file_data = template_story{
		text = story_txt,
		author = isanon == 0 and author or "Anonymous",
		title = title,
		tags = tags,
	}
	local filename = string.format("s%d.html",id)
	table.insert(zipped_files,{
		filename = filename,
		author = isanon == 0 and author or "Anonymous",
		tags = tags,
		title = title,
		posted = os.date("%B %d %Y",tonumber(post_time)),
	})
	local fd = assert(io.open(args.output .. "/" .. filename,"w"))
	assert(fd:write(file_data))
	assert(fd:close())
end

--index.html
local index_txt = template_main{
	stories = zipped_files,
}
local fd = assert(io.open(string.format("%s/index.html",args.output),"w"))
assert(fd:write(index_txt))
assert(fd:close())

--css
local cssfd = assert(io.open("assets/style.css","r"))
local csstxt = assert(cssfd:read("*a"))
assert(cssfd:close())
local fd = assert(io.open(string.format("%s/style.css",args.output),"w"))
assert(fd:write(csstxt))
assert(fd:close())

--remove the previous zip archive if it exists
local oldzipfd, err = io.open(args.output,"r")
if oldzipfd then
	local rmfd = assert(io.popen(string.format("rm %s.zip",args.output),"r"))
	assert(rmfd:read("*a"))
	assert(rmfd:close())
end
local zipfd = assert(io.popen(string.format("zip -r -j %s %s",args.output, args.output),"r"))
assert(zipfd:read("*a"))
assert(zipfd:close())
db:close()