local std = require("lib.std")
local symbol = require("lib.symbol")

local M = {}
M.__index = M

local default_html_header = [[
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
{{FAVICON}}
<title>{{TITLE}}</title>
<style>
:root { --bg:#f5f5f5; --text:#111827; --muted:#6b7280; --link:#1a0dab; --accent:#68a6ff; --highlight:#004d99; --note-bg:#fff; --panel-bg:#fff; --border:rgba(0,0,0,.1); --table-head:#f3f4f6; --code-color:#004d99; --blockquote-border:#1a73e8; --banner-bg:#fff; --footer-bg:#fff; --shadow:rgba(0,0,0,.08); }
@media (prefers-color-scheme: dark) { :root { --bg:#0f1113; --text:#e6eef3; --muted:#9aa6b1; --link:#68a6ff; --accent:#68a6ff; --highlight:#cde7ff; --note-bg:#1a1c20; --panel-bg:#1a1c20; --border:rgba(255,255,255,.06); --table-head:#1a1c20; --code-color:#cde7ff; --blockquote-border:#68a6ff; --banner-bg:#1a1c20; --footer-bg:#1a1c20; --shadow:rgba(0,0,0,.4); } }
html, body { min-height:100%; margin:0; padding:0; background:var(--bg); color:var(--text); font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif; line-height:1.5; -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; }
body { padding:36px; }
.container { max-width:830px; margin:0 auto; }
.container>*:not(.banner) { margin:28px 0; }
h1,h2,h3,h4,h5,h6 { font-weight:600; margin:0 0 12px 0; }
h1 { font-size:40px; margin-bottom:20px; font-weight:700; }
h2 { font-size:32px; margin:26px 0 14px; }
h3 { font-size:26px; margin:22px 0 12px; }
h4 { font-size:20px; margin:18px 0 10px; }
h5 { font-size:16px; margin:16px 0 8px; }
h6 { font-size:14px; margin:14px 0 6px; color:var(--muted); }
p { margin:14px 0; }
a { color:var(--link); text-decoration:none; transition: color .15s ease, text-decoration-color .15s ease; }
.hidden { color:var(--text); text-decoration:none; }
a:hover { text-decoration:underline; }
summary { cursor:pointer; }
details { background:var(--panel-bg); border:1px solid var(--border); border-radius:4px; padding:14px 16px; margin:16px 0; }
details summary { list-style:none; font-weight:600; color:var(--text); display:flex; align-items:center; }
details summary::-webkit-details-marker { display:none; }
details summary::before { content:"▸"; margin-right:8px; transition:transform .15s ease; color:var(--accent); }
details[open] summary::before { transform:rotate(90deg); }
summary::after { content:"Expand"; margin-left:auto; font-size:13px; color:var(--muted); }
details[open] summary::after { content:"Collapse"; }
details>*:not(summary) { margin-top:12px; }
.note, pre, code { background:var(--note-bg); border:1px solid var(--border); }
.note { padding:20px; border-radius:4px; margin:28px 0; color:var(--text); }
.note strong { color:var(--text); }
.muted { color:var(--muted); }
.lead { font-size:15px; margin-top:8px; }
.callout { display:block; margin:12px 0; }
.small { font-size:13px; color:var(--muted); margin-top:6px; }
.highlight { font-weight:700; color:var(--highlight); }
ul, ol { margin:14px 0; padding-left:26px; }
.tl { display:grid; grid-template-columns:repeat(auto-fill,200px); gap:15px; list-style-type:none; padding:0; margin:0; justify-content:start; }
ul.tl li { padding:10px; width:fit-content; }
li { margin:6px 0; }
code { padding:3px 7px; border-radius:3px; font-family:"SF Mono",Monaco,"Cascadia Code","Roboto Mono",Consolas,"Courier New",monospace; font-size:.9em; color:var(--code-color); }
pre { padding:20px; border-radius:4px; margin:14px 0; overflow-x:auto; font-family:"SF Mono",Monaco,"Cascadia Code","Roboto Mono",Consolas,"Courier New",monospace; font-size:14px; line-height:1.6; }
pre code { background:none; border:none; padding:0; font-size:inherit; }
blockquote { border-left:3px solid var(--blockquote-border); padding-left:18px; margin:14px 0; color:var(--text); font-style:italic; }
hr { border:0; border-top:1px solid rgba(0,0,0,.08); margin:26px 0; }
@media (prefers-color-scheme: dark) { hr { border-top-color:rgba(255,255,255,.1); } }
img { max-width:100%; height:auto; border-radius:4px; margin:14px 0; }
table { width:100%; border-collapse:collapse; margin:14px 0; }
th, td { padding:12px 16px; text-align:left; border-bottom:1px solid var(--border); }
th { background:var(--table-head); font-weight:600; color:var(--text); }
tr:hover { background:rgba(0,0,0,0.02); }
@media (prefers-color-scheme: dark) { tr:hover { background:rgba(255,255,255,0.02); } }
.divider { margin:26px 0; height:1px; background:rgba(0,0,0,.08); }
@media (prefers-color-scheme: dark) { .divider { background:rgba(255,255,255,.1); } }
.section { margin-top:36px; }
.links { margin:12px 0; }
.links a { display:inline-block; margin:0 14px 6px 0; color:var(--link); }
strong, b { font-weight:600; color:var(--text); }
em, i { font-style:italic; }
.center { display:flex; justify-content:center; align-items:center; }
.banner { width:100%; box-sizing:border-box; text-align:center; background:var(--banner-bg); padding:20px; border:1px solid var(--border); border-bottom-right-radius:8px; border-bottom-left-radius:8px; color:var(--text); margin:-36px 0 28px 0; box-shadow:0 0.2em 0.6em var(--shadow); }
.nav { margin-left:auto; margin-right:auto; }
.nav a { color:var(--highlight); }
.footer { background:var(--footer-bg); padding:20px 0; border-top:1px solid rgba(0,0,0,.08); font-size:14px; color:var(--muted); display:flex; justify-content:center; align-items:center; gap:24px; margin-top:28px !important; margin-bottom:0; }
.left { text-align:left; float:left; }
.right { text-align:right; float:right; }
</style>
</head>
<body>
<div class="container">
]]

local default_html_footer = [[
<footer class="footer">
<a href="https://git.vxserver.dev/fSD/fes" target="_blank">Fes Powered</a>
<a href="https://www.lua.org/" target="_blank">Lua Powered</a>
<a href="https://git.vxserver.dev/fSD/fes/src/branch/main/LICENSE" target="_blank">ISC Licensed</a>
<p>{{COPYRIGHT}}</p>
</footer>
</div>
</body>
</html>
]]

local default_gemini_header = [[
]]

local default_gemini_footer = [[
=> https://git.vxserver.dev/fSD/fes Fes Powered
=> https://www.lua.org Lua Powered
=> https://git.vxserver.dev/fSD/fes/src/branch/main/LICENSE ISC Licensed
{{COPYRIGHT}}
]]

function M.fes(proto, header, footer)
	proto = proto or "http"
	std.proto = proto

	local config = {}
	local site_config = {}
	local fes_mod = package.loaded.fes
	if fes_mod and fes_mod.config then
		config = fes_mod.config
		if config.site then
			site_config = config.site
		end
	end

	if proto == "http" and site_config.favicon then
		site_config.favicon =
			'<link rel="icon" type="image/x-icon" href="'
			.. site_config.favicon
			.. '">'
	end

	local default_header
	local default_footer

	if proto == "http" then
		default_header = default_html_header
		default_footer = default_html_footer
	elseif proto == "gemini" then
		default_header = default_gemini_header
		default_footer = default_gemini_footer
	end

	local self = {
		version = site_config.version,
		title = site_config.title,
		copyright = site_config.copyright,
		favicon = site_config.favicon,
		header = header or default_header,
		footer = footer or default_footer,
		parts = {},
		proto = proto,
	}

	return setmetatable(self, M)
end

function M:raw(str)
	table.insert(self.parts, (str or "") .. "\n")
	return self
end

for name, func in pairs(std) do
	if type(func) == "function" then
		M[name] = function(self, ...)
			table.insert(self.parts, func(...))
			return self
		end
	end
end

function M:build()
	if self.proto == "http" then
		local header = self.header:gsub("{{TITLE}}", self.title or "Document")
		local favicon_html = self.favicon or '<link rel="icon" href="data:image/svg+xml,<svg xmlns=%%22http://www.w3.org/2000/svg%%22 viewBox=%%220 0 100 100%%22><text y=%%22.9em%%22 font-size=%%2290%%22>🔥</text></svg>">'
		header = header:gsub("{{FAVICON}}", favicon_html)
		local footer = self.footer:gsub("{{COPYRIGHT}}", self.copyright or symbol.legal.copyright .. "The Copyright Holder")
		return header .. table.concat(self.parts, "\n") .. footer
	end
	return table.concat(self.parts, "\n")
end

M.__tostring = function(self)
	return self:build()
end

return M
