package main

import (
	"h4kor/kiss-social"
	"net/http"
	"os"
	"strconv"
	"strings"
)

func handler(repo kiss.Repository) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		// normalize the path
		path := r.URL.Path
		// remove leading '/'
		if len(path) > 0 && path[0] == '/' {
			path = path[1:]
		}
		// remove trailing '/'
		if len(path) > 0 && path[len(path)-1] == '/' {
			path = path[:len(path)-1]
		}

		// index page
		if path == "" {
			println("Index page")
			indexHandler(repo)(w, r)
			return
		}

		// parse the path
		parts := strings.Split(path, "/")
		userName := parts[0]

		// only one part -> user page
		if len(parts) == 1 {
			println("User page")
			userHandler(repo, userName)(w, r)
			return
		}

		// multiple parts -> post page
		println("Post page")
		postId := strings.Join(parts[1:], "/")
		postHandler(repo, userName, postId)(w, r)

	}
}

func indexHandler(repo kiss.Repository) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		users, err := repo.Users()
		if err != nil {
			println("Error getting users: ", err.Error())
			w.Write([]byte("Error getting users"))
			return
		}
		w.Write([]byte("Index"))
		w.Write([]byte("<ul>"))
		for _, user := range users {
			w.Write([]byte("<li>"))
			w.Write([]byte(user.Name()))
			w.Write([]byte("</li>"))
		}
	}
}

func userHandler(repo kiss.Repository, userName string) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		user, err := repo.GetUser(userName)
		if err != nil {
			println("Error getting user: ", err.Error())
			w.WriteHeader(http.StatusNotFound)
			w.Write([]byte("User not found"))
			return
		}
		html, err := kiss.RenderIndexPage(user)
		if err != nil {
			println("Error rendering index page: ", err.Error())
			w.WriteHeader(http.StatusInternalServerError)
			w.Write([]byte("Internal server error"))
			return
		}
		println("Rendering index page for user", userName)
		w.Write([]byte(html))
	}
}

func postHandler(repo kiss.Repository, userName string, postId string) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		user, err := repo.GetUser(userName)
		if err != nil {
			println("Error getting user: ", err.Error())
			w.WriteHeader(http.StatusNotFound)
			w.Write([]byte("User not found"))
			return
		}
		post, err := user.GetPost(postId)
		if err != nil {
			println("Error getting post: ", err.Error())
			w.WriteHeader(http.StatusNotFound)
			w.Write([]byte("Post not found"))
			return
		}
		html, err := kiss.RenderPost(post)
		if err != nil {
			println("Error rendering post: ", err.Error())
			w.WriteHeader(http.StatusInternalServerError)
			w.Write([]byte("Internal server error"))
			return
		}
		println("Rendering post", postId)
		w.Write([]byte(html))

	}
}

func main() {
	println("KISS Web Server")
	println("Parameters")
	println("-repo <repo> - Specify the repository to use. Defaults to '.'")
	println("-port <port> - Specify the port to use, Default is '8080'")
	var repoName string
	var port int
	for i, arg := range os.Args[0 : len(os.Args)-1] {
		if arg == "-port" {
			port, _ = strconv.Atoi(os.Args[i+1])
		}
		if arg == "-repo" {
			repoName = os.Args[i+1]
		}
	}
	if repoName == "" {
		repoName = "."
	}
	if port == 0 {
		port = 8080
	}

	repo, err := kiss.OpenRepository(repoName)
	if err != nil {
		println("Error opening repository: ", err.Error())
		os.Exit(1)
	}

	http.HandleFunc("/", handler(repo))

	println("Listening on port", port)
	http.ListenAndServe(":"+strconv.Itoa(port), nil)

}