# SPDX-License-Identifier: AGPL-3.0-only
# SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

.PHONY: clean version.go man

CFLAGS = -Wall -Wextra -Werror -pedantic -std=c99 -D_GNU_SOURCE
MAN_PAGES = forge.5 hookc.1

forge: version.go hookc/*.c hookc/hookc man # TODO
	go mod vendor
	go build .

man: $(MAN_PAGES:%=man/%.html)

man: $(MAN_PAGES:%=man/%.html) $(MAN_PAGES:%=man/%.txt)

man/%.html: man/%

	mandoc -Thtml -O style=static/mandoc.css $< > $@

	mandoc -Thtml -O style=./mandoc.css $< > $@

man/%.txt: man/%
	mandoc $< | col -b > $@

hookc/hookc:

version.go:
	printf 'package main\n\nconst VERSION = "%s"\n' `git describe --tags --always --dirty` > $@

clean:
	$(RM) forge version.go vendor

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"errors"
	"net/http"
	"strconv"
	"strings"

	"github.com/jackc/pgx/v5"
	"go.lindenii.runxiyu.org/lindenii-common/clog"
)

type forgeHTTPRouter struct{}

func (router *forgeHTTPRouter) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
	var remoteAddr string
	if config.HTTP.ReverseProxy {
		remoteAddrs, ok := request.Header["X-Forwarded-For"]
		if ok && len(remoteAddrs) == 1 {
			remoteAddr = remoteAddrs[0]
		} else {
			remoteAddr = request.RemoteAddr
		}
	} else {
		remoteAddr = request.RemoteAddr
	}
	clog.Info("Incoming HTTP: " + remoteAddr + " " + request.Method + " " + request.RequestURI)

	var segments []string
	var err error
	var sepIndex int
	params := make(map[string]any)

	if segments, _, err = parseReqURI(request.RequestURI); err != nil {
		errorPage400(writer, params, "Error parsing request URI: "+err.Error())
		return
	}
	dirMode := false
	if segments[len(segments)-1] == "" {
		dirMode = true
		segments = segments[:len(segments)-1]
	}

	params["url_segments"] = segments
	params["dir_mode"] = dirMode
	params["global"] = globalData
	var userID int // 0 for none
	userID, params["username"], err = getUserFromRequest(request)
	params["user_id"] = userID
	if err != nil && !errors.Is(err, http.ErrNoCookie) && !errors.Is(err, pgx.ErrNoRows) {
		errorPage500(writer, params, "Error getting user info from request: "+err.Error())
		return
	}

	if userID == 0 {
		params["user_id_string"] = ""
	} else {
		params["user_id_string"] = strconv.Itoa(userID)
	}

	if len(segments) == 0 {
		httpHandleIndex(writer, request, params)
		return
	}

	if segments[0] == ":" {
		if len(segments) < 2 {
			errorPage404(writer, params)
			return
		} else if len(segments) == 2 && redirectDir(writer, request) {
			return
		}

		switch segments[1] {

		case "man":
			manHandler.ServeHTTP(writer, request)
			return

		case "static":
			staticHandler.ServeHTTP(writer, request)
			return
		case "source":
			sourceHandler.ServeHTTP(writer, request)
			return
		}
	}

	if segments[0] == ":" {
		switch segments[1] {
		case "login":
			httpHandleLogin(writer, request, params)
			return
		case "users":
			httpHandleUsers(writer, request, params)
			return
		case "gc":
			httpHandleGC(writer, request, params)
			return
		default:
			errorPage404(writer, params)
			return
		}
	}

	sepIndex = -1
	for i, part := range segments {
		if part == ":" {
			sepIndex = i
			break
		}
	}

	params["separator_index"] = sepIndex

	var groupPath []string
	var moduleType string
	var moduleName string

	if sepIndex > 0 {
		groupPath = segments[:sepIndex]
	} else {
		groupPath = segments
	}
	params["group_path"] = groupPath

	switch {
	case sepIndex == -1:
		if redirectDir(writer, request) {
			return
		}
		httpHandleGroupIndex(writer, request, params)
	case len(segments) == sepIndex+1:
		errorPage404(writer, params)
		return
	case len(segments) == sepIndex+2:
		errorPage404(writer, params)
		return
	default:
		moduleType = segments[sepIndex+1]
		moduleName = segments[sepIndex+2]
		switch moduleType {
		case "repos":
			params["repo_name"] = moduleName

			if len(segments) > sepIndex+3 {
				switch segments[sepIndex+3] {
				case "info":
					if err = httpHandleRepoInfo(writer, request, params); err != nil {
						errorPage500(writer, params, err.Error())
					}
					return
				case "git-upload-pack":
					if err = httpHandleUploadPack(writer, request, params); err != nil {
						errorPage500(writer, params, err.Error())
					}
					return
				}
			}

			if params["ref_type"], params["ref_name"], err = getParamRefTypeName(request); err != nil {
				if errors.Is(err, errNoRefSpec) {
					params["ref_type"] = ""
				} else {
					errorPage500(writer, params, "Error querying ref type: "+err.Error())
					return
				}
			}

			// TODO: subgroups

			if params["repo"], params["repo_description"], params["repo_id"], err = openRepo(request.Context(), groupPath, moduleName); err != nil {
				errorPage500(writer, params, "Error opening repo: "+err.Error())
				return
			}

			if len(segments) == sepIndex+3 {
				if redirectDir(writer, request) {
					return
				}
				httpHandleRepoIndex(writer, request, params)
				return
			}

			repoFeature := segments[sepIndex+3]
			switch repoFeature {
			case "tree":
				if anyContain(segments[sepIndex+4:], "/") {
					errorPage400(writer, params, "Repo tree paths may not contain slashes in any segments")
					return
				}
				if dirMode {
					params["rest"] = strings.Join(segments[sepIndex+4:], "/") + "/"
				} else {
					params["rest"] = strings.Join(segments[sepIndex+4:], "/")
				}
				if len(segments) < sepIndex+5 && redirectDir(writer, request) {
					return
				}
				httpHandleRepoTree(writer, request, params)
			case "raw":
				if anyContain(segments[sepIndex+4:], "/") {
					errorPage400(writer, params, "Repo tree paths may not contain slashes in any segments")
					return
				}
				if dirMode {
					params["rest"] = strings.Join(segments[sepIndex+4:], "/") + "/"
				} else {
					params["rest"] = strings.Join(segments[sepIndex+4:], "/")
				}
				if len(segments) < sepIndex+5 && redirectDir(writer, request) {
					return
				}
				httpHandleRepoRaw(writer, request, params)
			case "log":
				if len(segments) > sepIndex+4 {
					errorPage400(writer, params, "Too many parameters")
					return
				}
				if redirectDir(writer, request) {
					return
				}
				httpHandleRepoLog(writer, request, params)
			case "commit":
				if len(segments) != sepIndex+5 {
					errorPage400(writer, params, "Incorrect number of parameters")
					return
				}
				if redirectNoDir(writer, request) {
					return
				}
				params["commit_id"] = segments[sepIndex+4]
				httpHandleRepoCommit(writer, request, params)
			case "contrib":
				if redirectDir(writer, request) {
					return
				}
				switch len(segments) {
				case sepIndex + 4:
					httpHandleRepoContribIndex(writer, request, params)
				case sepIndex + 5:
					params["mr_id"] = segments[sepIndex+4]
					httpHandleRepoContribOne(writer, request, params)
				default:
					errorPage400(writer, params, "Too many parameters")
				}
			default:
				errorPage404(writer, params)
				return
			}
		default:
			errorPage404(writer, params)
			return
		}
	}
}

/*.html

/*.txt

// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>

package main

import (
	"embed"
	"html/template"
	"io/fs"
	"net/http"

	"github.com/tdewolff/minify/v2"
	"github.com/tdewolff/minify/v2/html"
)

// We embed all source for easy AGPL compliance.
//
//go:embed .gitignore .gitattributes
//go:embed LICENSE README.md
//go:embed *.go go.mod go.sum
//go:embed *.scfg
//go:embed Makefile

//go:embed static/* templates/* scripts/* sql/*

//go:embed static/* templates/* scripts/* sql/* man/*

//go:embed hookc/*.c
//go:embed vendor/*
var sourceFS embed.FS

var sourceHandler = http.StripPrefix(
	"/:/source/",
	http.FileServer(http.FS(sourceFS)),
)

//go:embed templates/* static/* hookc/hookc

//go:embed templates/* static/* hookc/hookc man/*.html man/*.txt man/*.css

var resourcesFS embed.FS

var templates *template.Template

func loadTemplates() (err error) {
	minifier := minify.New()
	minifierOptions := html.Minifier{
		TemplateDelims:      [2]string{"{{", "}}"},
		KeepDefaultAttrVals: true,
	} //exhaustruct:ignore
	minifier.Add("text/html", &minifierOptions)

	templates = template.New("templates").Funcs(template.FuncMap{
		"first_line":        firstLine,
		"base_name":         baseName,
		"path_escape":       pathEscape,
		"query_escape":      queryEscape,
		"dereference_error": dereferenceOrZero[error],
		"minus":             minus,
	})

	err = fs.WalkDir(resourcesFS, "templates", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if !d.IsDir() {
			content, err := fs.ReadFile(resourcesFS, path)
			if err != nil {
				return err
			}

			minified, err := minifier.Bytes("text/html", content)
			if err != nil {
				return err
			}

			_, err = templates.Parse(bytesToString(minified))
			if err != nil {
				return err
			}
		}
		return nil
	})
	return err
}

var staticHandler http.Handler

var manHandler http.Handler

func init() {
	staticFS, err := fs.Sub(resourcesFS, "static")
	if err != nil {
		panic(err)
	}
	staticHandler = http.StripPrefix("/:/static/", http.FileServer(http.FS(staticFS)))

	manFS, err := fs.Sub(resourcesFS, "man")
	if err != nil {
		panic(err)
	}
	manHandler = http.StripPrefix("/:/man/", http.FileServer(http.FS(manFS)))

}

/* $OpenBSD: mandoc.css,v 1.41 2025/01/25 03:17:11 schwarze Exp $ */
/*
 * Standard style sheet for mandoc(1) -Thtml and man.cgi(8).
 *
 * Written by Ingo Schwarze <schwarze@openbsd.org>.
 * I place this file into the public domain.
 * Permission to use, copy, modify, and distribute it for any purpose
 * with or without fee is hereby granted, without any conditions.
 */

/* Global defaults. */

html {		max-width: 65em;
		--bg: #FFFFFF;
		--fg: #000000; }
body {		background: var(--bg);
		color: var(--fg);
		font-family: Helvetica,Arial,sans-serif; }
h1, h2 {	font-size: 110%; }
table {		margin-top: 0em;
		margin-bottom: 0em;
		border-collapse: collapse; }
/* Some browsers set border-color in a browser style for tbody,
 * but not for table, resulting in inconsistent border styling. */
tbody {		border-color: inherit; }
tr {		border-color: inherit; }
td {		vertical-align: top;
		padding-left: 0.2em;
		padding-right: 0.2em;
		border-color: inherit; }
ul, ol, dl {	margin-top: 0em;
		margin-bottom: 0em; }
li, dt {	margin-top: 1em; }
pre {		font-family: inherit; }

.permalink {	border-bottom: thin dotted;
		color: inherit;
		font: inherit;
		text-decoration: inherit; }
* {		clear: both }

/* Search form and search results. */

fieldset {	border: thin solid silver;
		border-radius: 1em;
		text-align: center; }
input[name=expr] {
		width: 25%; }

table.results {	margin-top: 1em;
		margin-left: 2em;
		font-size: smaller; }

/* Header and footer lines. */

div[role=doc-pageheader] {
		display: flex;
		border-bottom: 1px dotted #808080;
		margin-bottom: 1em;
		font-size: smaller; }
.head-ltitle {	flex: 1; }
.head-vol {	flex: 0 1 auto;
		text-align: center; }
.head-rtitle {	flex: 1;
		text-align: right; }

div[role=doc-pagefooter] {
		display: flex;
		justify-content: space-between;
		border-top: 1px dotted #808080;
		margin-top: 1em;
		font-size: smaller; }
.foot-left {	flex: 1; }
.foot-date {	flex: 0 1 auto;
		text-align: center; }
.foot-os {	flex: 1;
		text-align: right; }

/* Sections and paragraphs. */

main {		margin-left: 3.8em; }
.Nd { }
section.Sh { }
h2.Sh {		margin-top: 1.2em;
		margin-bottom: 0.6em;
		margin-left: -3.2em; }
section.Ss { }
h3.Ss {		margin-top: 1.2em;
		margin-bottom: 0.6em;
		margin-left: -1.2em;
		font-size: 105%; }
.Pp {		margin: 0.6em 0em; }
.Sx { }
.Xr { }

/* Displays and lists. */

.Bd { }
.Bd-indent {	margin-left: 3.8em; }

.Bl-bullet {	list-style-type: disc;
		padding-left: 1em; }
.Bl-bullet > li { }
.Bl-dash {	list-style-type: none;
		padding-left: 0em; }
.Bl-dash > li:before {
		content: "\2014  "; }
.Bl-item {	list-style-type: none;
		padding-left: 0em; }
.Bl-item > li { }
.Bl-compact > li {
		margin-top: 0em; }

.Bl-enum {	padding-left: 2em; }
.Bl-enum > li { }
.Bl-compact > li {
		margin-top: 0em; }

.Bl-diag { }
.Bl-diag > dt {
		font-style: normal;
		font-weight: bold; }
.Bl-diag > dd {
		margin-left: 0em; }
.Bl-hang { }
.Bl-hang > dt { }
.Bl-hang > dd {
		margin-left: 5.5em; }
.Bl-inset { }
.Bl-inset > dt { }
.Bl-inset > dd {
		margin-left: 0em; }
.Bl-ohang { }
.Bl-ohang > dt { }
.Bl-ohang > dd {
		margin-left: 0em; }
.Bl-tag {	margin-top: 0.6em;
		margin-left: 5.5em; }
.Bl-tag > dt {
		float: left;
		margin-top: 0em;
		margin-left: -5.5em;
		padding-right: 0.5em;
		vertical-align: top; }
.Bl-tag > dd {
		clear: right;
		column-count: 1;  /* Force block formatting context. */
		width: 100%;
		margin-top: 0em;
		margin-left: 0em;
		margin-bottom: 0.6em;
		vertical-align: top; }
.Bl-compact {	margin-top: 0em; }
.Bl-compact > dd {
		margin-bottom: 0em; }
.Bl-compact > dt {
		margin-top: 0em; }

.Bl-column { }
.Bl-column > tbody > tr { }
.Bl-column > tbody > tr > td {
		margin-top: 1em; }
.Bl-compact > tbody > tr > td {
		margin-top: 0em; }

.Rs {		font-style: normal;
		font-weight: normal; }
.RsA { }
.RsB {		font-style: italic;
		font-weight: normal; }
.RsC { }
.RsD { }
.RsI {		font-style: italic;
		font-weight: normal; }
.RsJ {		font-style: italic;
		font-weight: normal; }
.RsN { }
.RsO { }
.RsP { }
.RsQ { }
.RsR { }
.RsT {		font-style: normal;
		font-weight: normal; }
.RsU { }
.RsV { }

.eqn { }
.tbl td {	vertical-align: middle; }

.HP {		margin-left: 3.8em;
		text-indent: -3.8em; }

/* Semantic markup for command line utilities. */

table.Nm { }
code.Nm {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
.Fl {		font-style: normal;
		font-weight: bold;
		font-family: inherit; }
.Cm {		font-style: normal;
		font-weight: bold;
		font-family: inherit; }
.Ar {		font-style: italic;
		font-weight: normal; }
.Op {		display: inline flow; }
.Ic {		font-style: normal;
		font-weight: bold;
		font-family: inherit; }
.Ev {		font-style: normal;
		font-weight: normal;
		font-family: monospace; }
.Pa {		font-style: italic;
		font-weight: normal; }

/* Semantic markup for function libraries. */

.Lb { }
code.In {	font-style: normal;
		font-weight: bold;
		font-family: inherit; }
a.In { }
.Fd {		font-style: normal;
		font-weight: bold;
		font-family: inherit; }
.Ft {		font-style: italic;
		font-weight: normal; }
.Fn {		font-style: normal;
		font-weight: bold;
		font-family: inherit; }
.Fa {		font-style: italic;
		font-weight: normal; }
.Vt {		font-style: italic;
		font-weight: normal; }
.Va {		font-style: italic;
		font-weight: normal; }
.Dv {		font-style: normal;
		font-weight: normal;
		font-family: monospace; }
.Er {		font-style: normal;
		font-weight: normal;
		font-family: monospace; }

/* Various semantic markup. */

.An { }
.Lk { }
.Mt { }
.Cd {		font-style: normal;
		font-weight: bold;
		font-family: inherit; }
.Ad {		font-style: italic;
		font-weight: normal; }
.Ms {		font-style: normal;
		font-weight: bold; }
.St { }
.Ux { }

/* Physical markup. */

.Bf {		display: inline flow; }
.No {		font-style: normal;
		font-weight: normal; }
.Em {		font-style: italic;
		font-weight: normal; }
.Sy {		font-style: normal;
		font-weight: bold; }
.Li {		font-style: normal;
		font-weight: normal;
		font-family: monospace; }

/* Tooltip support. */

h2.Sh, h3.Ss {	position: relative; }
.An, .Ar, .Cd, .Cm, .Dv, .Em, .Er, .Ev, .Fa, .Fd, .Fl, .Fn, .Ft,
.Ic, code.In, .Lb, .Lk, .Ms, .Mt, .Nd, code.Nm, .Pa, .Rs,
.St, .Sx, .Sy, .Va, .Vt, .Xr {
		display: inline flow;
		position: relative; }

.An::before {	content: "An"; }
.Ar::before {	content: "Ar"; }
.Cd::before {	content: "Cd"; }
.Cm::before {	content: "Cm"; }
.Dv::before {	content: "Dv"; }
.Em::before {	content: "Em"; }
.Er::before {	content: "Er"; }
.Ev::before {	content: "Ev"; }
.Fa::before {	content: "Fa"; }
.Fd::before {	content: "Fd"; }
.Fl::before {	content: "Fl"; }
.Fn::before {	content: "Fn"; }
.Ft::before {	content: "Ft"; }
.Ic::before {	content: "Ic"; }
code.In::before { content: "In"; }
.Lb::before {	content: "Lb"; }
.Lk::before {	content: "Lk"; }
.Ms::before {	content: "Ms"; }
.Mt::before {	content: "Mt"; }
.Nd::before {	content: "Nd"; }
code.Nm::before { content: "Nm"; }
.Pa::before {	content: "Pa"; }
.Rs::before {	content: "Rs"; }
h2.Sh::before {	content: "Sh"; }
h3.Ss::before {	content: "Ss"; }
.St::before {	content: "St"; }
.Sx::before {	content: "Sx"; }
.Sy::before {	content: "Sy"; }
.Va::before {	content: "Va"; }
.Vt::before {	content: "Vt"; }
.Xr::before {	content: "Xr"; }

.An::before, .Ar::before, .Cd::before, .Cm::before,
.Dv::before, .Em::before, .Er::before, .Ev::before,
.Fa::before, .Fd::before, .Fl::before, .Fn::before, .Ft::before,
.Ic::before, code.In::before, .Lb::before, .Lk::before,
.Ms::before, .Mt::before, .Nd::before, code.Nm::before,
.Pa::before, .Rs::before,
h2.Sh::before, h3.Ss::before, .St::before, .Sx::before, .Sy::before,
.Va::before, .Vt::before, .Xr::before {
		opacity: 0;
		transition: .15s ease opacity;
		pointer-events: none;
		position: absolute;
		bottom: 100%;
		box-shadow: 0 0 .35em var(--fg);
		padding: .15em .25em;
		white-space: nowrap;
		font-family: Helvetica,Arial,sans-serif;
		font-style: normal;
		font-weight: bold;
		background: var(--bg);
		color: var(--fg); }
.An:hover::before, .Ar:hover::before, .Cd:hover::before, .Cm:hover::before,
.Dv:hover::before, .Em:hover::before, .Er:hover::before, .Ev:hover::before,
.Fa:hover::before, .Fd:hover::before, .Fl:hover::before, .Fn:hover::before,
.Ft:hover::before, .Ic:hover::before, code.In:hover::before,
.Lb:hover::before, .Lk:hover::before, .Ms:hover::before, .Mt:hover::before,
.Nd:hover::before, code.Nm:hover::before, .Pa:hover::before,
.Rs:hover::before, h2.Sh:hover::before, h3.Ss:hover::before, .St:hover::before,
.Sx:hover::before, .Sy:hover::before, .Va:hover::before, .Vt:hover::before,
.Xr:hover::before {
		opacity: 1;
		pointer-events: inherit; }

/* Overrides to avoid excessive margins on small devices. */

@media (max-width: 37.5em) {
main {		margin-left: 0.5em; }
h2.Sh, h3.Ss {	margin-left: 0em; }
.Bd-indent {	margin-left: 2em; }
.Bl-hang > dd {
		margin-left: 2em; }
.Bl-tag {	margin-left: 2em; }
.Bl-tag > dt {
		margin-left: -2em; }
.HP {		margin-left: 2em;
		text-indent: -2em; }
}

/* Overrides for a dark color scheme for accessibility. */

@media (prefers-color-scheme: dark) {
html {		--bg: #1E1F21;
		--fg: #EEEFF1; }
:link {		color: #BAD7FF; }
:visited {	color: #F6BAFF; }
}