local Y=require("yaru.core")
local gfx=require("yaru.gfx")
local ui=require("yaru.ui")
local unicode=require("unicode")
local M={}

local MONTHS={"January","February","March","April","May","June","July","August","September","October","November","December"}

local function daysIn(y,m)
local d={31,28,31,30,31,30,31,31,30,31,30,31}
if m==2 and(y%4==0 and(y%100~=0 or y%400==0))then return 29 end
return d[m]
end

local function weekday(y,m,d)
local tt={0,3,2,5,0,3,5,1,4,6,2,4}
if m<3 then y=y-1 end
local w=(y+y//4-y//100+y//400+tt[m]+d)%7
return(w+6)%7
end

local function ago(t)
local d=Y.now()-t
if d<60 then return"now"elseif d<3600 then return(d//60).." min"end
return Y.date("%H:%M",t)
end

function M.open()
local now=Y.now()
local o={kind="calendar",y=tonumber(Y.date("%Y",now)),m=tonumber(Y.date("%m",now)),off=0}
Y.unread=false
local pw,ph=74,20
local W=Y.size()
local x0,y0=(W-pw)//2,3

function o.draw()
local t=Y.theme
local mx,my=x0,y0
ui.card(mx,my,pw,ph,t.menu)

local nw=42
local list=Y.notifs
if#list==0 then
gfx.text(mx+(nw-16)//2,my+ph//2-1,"No Notifications",t.dim,t.menu)
else
local y=my+1
for i=1+o.off,#list do
local n=list[i]
if y+2>my+ph-3 then break end
ui.round(mx+1,y,nw-2,2,t.menuHi)
gfx.text(mx+2,y,ui.trunc(n.title,nw-12),t.menuFg,t.menuHi)
local a=ago(n.time)
gfx.text(mx+nw-3-unicode.len(a),y,a,t.dim,t.menuHi)
gfx.text(mx+2,y+1,ui.trunc(n.body:gsub("\n"," "),nw-5),t.dim,t.menuHi)
local idx=i
o.hits[#o.hits+1]={mx+1,y,nw-2,2,function()
local nn=table.remove(Y.notifs,idx)
if nn and nn.action then Y.closeOverlay();pcall(nn.action)end
end}
y=y+3
end
end

local fy=my+ph-2
gfx.text(mx+2,fy,"Do Not Disturb",t.menuFg,t.menu)
ui.switch(o,mx+17,fy,Y.cfg.dnd,function()Y.cfg.dnd=not Y.cfg.dnd;Y.saveConfig()end)
if#list>0 then ui.button(o,mx+nw-9,fy,"Clear",function()Y.notifs={};o.off=0 end)end
for yy=my+1,my+ph-2 do gfx.text(mx+nw,yy,"│",t.sep,t.menu)end

local cx=mx+nw+2
local today=Y.now()
gfx.text(cx,my+1,Y.date("%A",today),t.dim,t.menu)
gfx.text(cx,my+2,Y.date("%B %d %Y",today),t.menuFg,t.menu)
local title=MONTHS[o.m].." "..o.y
gfx.text(cx,my+4,"‹",t.menuFg,t.menu)
gfx.text(cx+3+(22-unicode.len(title))//2,my+4,title,t.menuFg,t.menu)
gfx.text(cx+27,my+4,"›",t.menuFg,t.menu)
o.hits[#o.hits+1]={cx-1,my+4,3,1,function()o.m=o.m-1;if o.m<1 then o.m,o.y=12,o.y-1 end end}
o.hits[#o.hits+1]={cx+26,my+4,3,1,function()o.m=o.m+1;if o.m>12 then o.m,o.y=1,o.y+1 end end}
local hdr={"M","T","W","T","F","S","S"}
for i,h in ipairs(hdr)do gfx.text(cx+(i-1)*4+1,my+6,h,t.dim,t.menu)end
local first=weekday(o.y,o.m,1)
local ty,tm,td=tonumber(Y.date("%Y",today)),tonumber(Y.date("%m",today)),tonumber(Y.date("%d",today))
for d=1,daysIn(o.y,o.m)do
local cell=first+d-1
local col,row=cell%7,cell//7
local x,y=cx+col*4,my+7+row*2
local isToday=o.y==ty and o.m==tm and d==td
local s=string.format("%2d",d)
if isToday then ui.pill(x-1,y,4,t.accent);gfx.text(x,y,s,0xFFFFFF,t.accent)
else gfx.text(x,y,s,col>=5 and t.dim or t.menuFg,t.menu)end
end
o.hits[#o.hits+1]={mx,my,pw,ph,function()end}
end
function o.touch()Y.closeOverlay()return true end
function o.scroll(_,x,y,dir)
if x<x0+42 then o.off=math.max(0,math.min(#Y.notifs-1,o.off-dir))
else o.m=o.m-dir;if o.m<1 then o.m,o.y=12,o.y-1 elseif o.m>12 then o.m,o.y=1,o.y+1 end end
gfx.damage(x0,y0-1,pw+1,ph+3)
end
function o.key(_,char,code)
if code==Y.K.esc then Y.closeOverlay()end
end
Y.openOverlay(o)
return o
end

return M