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package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	_ "net/http/pprof"
	"os"
	"slices"
	"strings"
	"time"
)

func LoadPostsForUser(u *User) {
	posts := []*NoteMeta{}
	WalkCache(u, "notes", "", func(id string, data []byte) {
		note := &NoteMeta{}
		if err := json.Unmarshal(data, note); err == nil {
			note.created, _ = time.Parse("2006-01-02T15:04:05Z", note.Published)
			posts = append(posts, note)
		}
	})
	slices.SortFunc(posts, func(a *NoteMeta, b *NoteMeta) int {
		return a.created.Compare(b.created)
	})
	slices.Reverse(posts)
	u.LoadPosts(posts)
}

func LoadUsers(config *Config) map[string]*User {
	users := make(map[string]*User)
	items, _ := os.ReadDir("users")
	userList := []*User{}
	for _, item := range items {
		if item.IsDir() {
		} else {
			// handle file there
			user := UserFromFile("users/"+item.Name(), config)
			fmt.Printf("[startup] Loading User %s\n", user.UserName)
			userNameNoAt := strings.TrimPrefix(user.UserName, "@")
			users["acct:"+userNameNoAt+"@"+user.config.Host] = user
			users["acct:"+user.UserName+"@"+user.config.Host] = user
			users[userNameNoAt+"@"+user.config.Host] = user
			users[user.UserName+"@"+user.config.Host] = user
			http.HandleFunc("/"+userNameNoAt+"/inbox", user.processInbox)
			http.HandleFunc("/"+userNameNoAt+"/outbox", user.processOutbox)
			http.HandleFunc("/"+userNameNoAt+"/followers", user.processFollowers)
			http.HandleFunc("/"+userNameNoAt+"/posts/{id}", user.processPost)

			http.HandleFunc("/"+userNameNoAt+"/posts/{id}/{collection}", user.processCollection)

			http.HandleFunc("/"+userNameNoAt, user.processUserPage)
			http.HandleFunc("/"+user.UserName, user.processUserPage)
			http.HandleFunc("/"+userNameNoAt+".rss", user.processUserPageRSS)
			http.HandleFunc("/"+userNameNoAt+".json", user.processUserPageJson)
			http.HandleFunc("/"+userNameNoAt+"/mentions", user.viewMentions)
			LoadPostsForUser(user)
			userList = append(userList, user)
		}
	}

	slices.SortFunc(userList, func(a *User, b *User) int {
		return strings.Compare(a.UserName, b.UserName)
	})
	config.Users = userList
	return users
}

func (config *Config) Misc(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path == "" || r.URL.Path == "/" || r.URL.Path == "index.html" {
		page := config.DefaultPage(r)
		page.Accounts = config.Users
		config.Templates.ExecuteTemplate(w, "index.tpl.html", page)
	} else {
		fmt.Printf("[error] unregistered handler: %v\n", r.URL)
	}
}

func main() {

	if len(os.Args) < 2 {
		fmt.Printf("usage: tap <hostname> (<port>)\n")
		os.Exit(1)
	}

	// default to 3009, other use the arg provided...
	port := "3009"
	if len(os.Args) == 3 {
		fmt.Printf("usage: tap <hostname>\n")
		port = os.Args[2]
	}

	// instantiate a configuration for the service.
	config, err := InitConfig(os.Args[1])
	if err != nil {
		fmt.Printf("[startup]  Unable to load templates: %v", err)
		os.Exit(1)
	}

	// load user accounts
	users := LoadUsers(config)

	// Handle the webfinger service
	wfs := WebFingerServer{Users: users}
	http.HandleFunc("/.well-known/webfinger", wfs.Handle)

	nfs := NodeInfoServer{Host: config.Host}
	http.HandleFunc("/.well-known/nodeinfo", nfs.HandleWellKnown)
	http.HandleFunc("/nodeinfo/2.0", nfs.Handle2)

	// Handle static files e.g. css, profile images etc.
	fs := http.FileServer(http.Dir("static"))
	http.Handle("/static/", http.StripPrefix("/static/", fs))

	// Handle authenticated endpoints e.g. new post, like, swtich account etc.
	http.HandleFunc("/login", config.loginHandler)
	http.HandleFunc("/new", config.newHandler)
	http.HandleFunc("/admin", config.newHandler)
	http.HandleFunc("/switch", config.switchHandler)
	http.HandleFunc("/like", config.likeHandler)

	// not found handler for anything not explicitly defined
	http.HandleFunc("/", config.Misc)

	if _, err := os.Stat("tap-profiling"); err == nil {
		fmt.Printf("turning on profiling support\n")
		go func() {
			http.ListenAndServe("0.0.0.0:6060", nil) // Port for pprof
		}()
	}

	err = http.ListenAndServe("127.0.0.1:"+port, nil)
	if err != nil {
		fmt.Printf("[startup]  Unable to bind to port: %v", err)
	}
}