import tkinter as tk
import tkinter.messagebox
import tkinter.simpledialog
import gemini
import renderEngine
import urllib.parse

# See https://tildegit.org/solderpunk/gemini-demo-1/src/branch/master/gemini-demo.py

class Application():
    def __init__(self):
        self.root = tk.Tk()
        self.nav_bar = NavBar(self)
        self.content = Content(self)
        self.root.mainloop()
        self.current_URL = "about:home"

    def updateContent(self):
        # Get url asked
        url=self.nav_bar.getURL()

        # Is it a Gemini URL
        if not(verifyURL(url)):
            tkinter.messagebox.showerror("URL error", url+" is not a correct Gemini URL ! (HTTP/S is not supported, please use a web browser instead)")
            return

        self.current_URL = self.nav_bar.getURL()

        # New request
        r = gemini.Request(self.current_URL)
        status = r.makeRequest()

        # The server asked for user input
        if status[0] == "1":
            user_input = tkinter.simpledialog.askstring("User input", "The server asked for " + r.meta + ".")
            self.nav_bar.URL_var.set(self.current_URL + "?" + user_input)
            self.updateContent()
        # If server asked for redirection
        elif status[0] == "3":
            # Ask to user
            confirm = tkinter.messagebox.askyesno("Server redirection", "This server ask for redirection to " + r.meta + ". Follow ?")
            # If he accepted
            if confirm:
                self.nav_bar.URL_var.set(r.meta)
                self.updateContent()
        # The server asked for client certificate, unsupported
        elif status[0] == "6":
            tkinter.messagebox.showerror("Client certificate required", "Error " + status + " : " + r.meta)
        else:
            self.content.setContent(r.content)

    def linkClick(self, url):
        # Check if it is an absolute URL
        if "://" in url:
            # Check if it is a gemini URL
            if verifyURL(url):
                self.nav_bar.URL_var.set(url)
                self.updateContent()
            # Else show error
            else:
                tkinter.messagebox.showerror("URL error", url+" is not a correct Gemini URL ! (HTTP/S is not supported, please use a web browser instead)")
        # It is relative
        else:
            # Join current URL and relative path
            base = self.current_URL
            base = base.replace("gemini://","http://")
            url = urllib.parse.urljoin(base, url)
            url = url.replace("http://", "gemini://")

            # We can verify because sometime there is errors (mailto:)
            if verifyURL(url):
                self.nav_bar.URL_var.set(url)
                self.updateContent()
            else:
                tkinter.messagebox.showerror("URL error", url+" is not a correct Gemini URL ! (HTTP/S is not supported, please use a web browser instead)")

def verifyURL(url):
    if "://" in url:
        parsed_url = urllib.parse.urlparse(url)
        if parsed_url.scheme == "gemini":
            return True
        else:
            return False

class NavBar():
    def __init__(self, parent):
        self.parent = parent
        self.URL_var = tk.StringVar()
        self.root = tk.Frame(self.parent.root)
        self.root.grid(column=0, row=0)
        self.URL_bar = tk.Entry(self.root, textvariable=self.URL_var)
        self.URL_var.set("about:home")
        self.URL_bar.grid(column=0, row=0)
        self.go_button = tk.Button(self.root, text='Go !', command=self.parent.updateContent)
        self.go_button.grid(column=1, row=0)

    def getURL(self):
        return self.URL_var.get()

class Content():
    def __init__(self, parent):
        self.parent = parent
        self.root = renderEngine.Renderer(self.parent, "#Home page\nWelcome on tkGemini, a browser software for Gemini protocole\n=>gemini://rdelaage.ovh My gemini space")
        self.root.parse()
        self.root.content.grid(column=0, row=1)
        self.scroll_bar = tk.Scrollbar(command=self.root.content.yview, orient='vertical')
        self.scroll_bar.grid(column=1, row=1)
        self.root.content['yscrollcommand'] = self.scroll_bar.set

    def setContent(self, new_content):
        self.root.text = new_content
        self.root.parse()

    def linkClick(self, url):
        self.parent.nav_bar.URL_var = url
        self.parent.updateContent

app = Application()