local utilities = require('otouto.utilities')
local drua = require('otouto.drua-tg')

local blacklist = {}

function blacklist:init(config)
    blacklist.triggers = utilities.triggers(self.info.username, config.cmd_pat)
        :t('blacklist', true):t('unblacklist', true).table
    blacklist.error = false
end

function blacklist:action(msg, config)
    if msg.from.id ~= config.admin then return true end
    local targets = {}
    if msg.reply_to_message then
        table.insert(targets, {
            id = msg.reply_to_message.from.id,
            id_str = tostring(msg.reply_to_message.from.id),
            name = utilities.build_name(msg.reply_to_message.from.first_name, msg.reply_to_message.from.last_name)
        })
    else
        local input = utilities.input(msg.text)
        if input then
            for user in input:gmatch('%g+') do
                if self.database.users[user] then
                    table.insert(targets, {
                        id = self.database.users[user].id,
                        id_str = tostring(self.database.users[user].id),
                        name = utilities.build_name(self.database.users[user].first_name, self.database.users[user].last_name)
                    })
                elseif tonumber(user) then
                    local t = {
                        id_str = user,
                        id = tonumber(user)
                    }
                    if tonumber(user) < 0 then
                        t.name = 'Group (' .. user .. ')'
                    else
                        t.name = 'Unknown (' .. user .. ')'
                    end
                    table.insert(targets, t)
                elseif user:match('^@') then
                    local u = utilities.resolve_username(self, user)
                    if u then
                        table.insert(targets, {
                            id = u.id,
                            id_str = tostring(u.id),
                            name = utilities.build_name(u.first_name, u.last_name)
                        })
                    else
                        table.insert(targets, { err = 'Sorry, I do not recognize that username ('..user..').' })
                    end
                else
                    table.insert(targets, { err = 'Invalid username or ID ('..user..').' })
                end
            end
        else
            utilities.send_reply(msg, 'Please specify a user or users via reply, username, or ID, or a group or groups via ID.')
            return
        end
    end
    local output = ''
    local s = drua.sopen()
    if msg.text:match('^'..config.cmd_pat..'blacklist') then
        for _, target in ipairs(targets) do
            if target.err then
                output = output .. target.err .. '\n'
            elseif self.database.blacklist[target.id_str] then
                output = output .. target.name .. ' is already blacklisted.\n'
            else
                self.database.blacklist[target.id_str] = true
                output = output .. target.name .. ' is now blacklisted.\n'
                if config.drua_block_on_blacklist and target.id > 0 then
                    drua.block(target.id, s)
                end
            end
        end
    elseif msg.text:match('^'..config.cmd_pat..'unblacklist') then
        for _, target in ipairs(targets) do
            if target.err then
                output = output .. target.err .. '\n'
            elseif not self.database.blacklist[target.id_str] then
                output = output .. target.name .. ' is not blacklisted.\n'
            else
                self.database.blacklist[target.id_str] = nil
                output = output .. target.name .. ' is no longer blacklisted.\n'
                if config.drua_block_on_blacklist and target.id > 0 then
                    drua.unblock(target.id, s)
                end
            end
        end
    end
    s:close()
    utilities.send_reply(msg, output)
end

return blacklist