import os
import platform
import tkinter.filedialog
import unicodedata

from canvas import *
from project import *

##### CONFIG #####

WINDOW_SIZE = (
    (1280,720),
    (1920,1019)
)[0]

cross_color = (255, 60, 25)
pixel_color = (255,) * 3

##################

project=Project()

def button_create_project_click(subwindow,w,h):
    try:
        width=int(w)
    except ValueError as e:
        tkinter.messagebox.showerror("Creating new project", f"Invalid value {w}: {e}")
        return
    try:
        height=int(h)
    except ValueError as e:
        tkinter.messagebox.showerror("Creating new project", f"Invalid value {h}: {e}")
        return
    project.chars={}
    project.char_res=(width,height)
    project.loaded=True
    canvas_editor.after_project_load()
    canvas_editor.draw()
    update_glyph_preview()
    subwindow.destroy()


def menu_file_new_project_click():
    global window
    if project.modified and not tkinter.messagebox.askyesno("Creating new project","You have unsaved changes, are you sure?"):
        return
    subwindow=tkinter.Toplevel(window)
    subwindow.title("New project")

    label_width=tkinter.Label(subwindow,text="Character width")
    label_width.pack(side="top")

    entry_width=tkinter.Entry(subwindow,validate="all",validatecommand=((subwindow.register(number_only_validate)),"%P"))
    entry_width.pack(side="top",fill="x",padx=5)

    label_height=tkinter.Label(subwindow,text="Character height")
    label_height.pack(side="top")

    entry_height=tkinter.Entry(subwindow,validate="all",validatecommand=((subwindow.register(number_only_validate)),"%P"))
    entry_height.pack(side="top",fill="x",padx=5)

    button_create=tkinter.Button(subwindow,text="Create",command=lambda: button_create_project_click(subwindow,entry_width.get(),entry_height.get()))
    button_create.pack(side="bottom",fill="x",padx=5)


def open_project(file_path):
    try:
        project.load(file_path)
    except AttributeError as e:
        tkinter.messagebox.showerror("Opening project",f"Project '{file_path}' is invalid: {e}")
    except IOError as e:
        tkinter.messagebox.showerror("Opening project",f"Failed to open project '{file_path}': {e}")
    finally:
        canvas_editor.after_project_load()
        canvas_editor.draw()
        update_glyph_preview()


def menu_file_open_project_click():
    global project
    global canvas_editor

    file_path = tkinter.filedialog.askopenfilename(
        title="Open font project",
        filetypes=[("Font project (json)", "*.fontproj")]
    )
    if file_path == "" or file_path==():
        return

    # save last path to cache
    with open("last_path_cache.txt", "w") as f:
        f.write(file_path)

    open_project(file_path)


def menu_file_open_last_project_click():
    try:
        cache=open("last_path_cache.txt","r")
        file_path=cache.read()
        cache.close()
        open_project(file_path)
    except IOError:
        tkinter.messagebox.showerror("Opening last project","Failed to load last project cache")


def save_project(ask):
    global canvas_editor
    global project

    if not project.loaded:
        return

    path=None
    if project.path and not ask:
        path=project.path
    else:
        # show file save dialog
        path=tkinter.filedialog.asksaveasfilename(
            title="Save font project",
            filetypes=[("Font project (json)", "*.fontproj")],
            defaultextension=".fontproj"
        )
        if path=="" or path==():
            return

    # save last path to cache
    with open("last_path_cache.txt", "w") as f:
        f.write(path)

    canvas_editor.save_char()
    try:
        project.save(path)
    except IOError as e:
        tkinter.messagebox.showerror("Saving project",f"Failed to save project '{path}': {e}")


def export_project(ask):
    if not project.loaded:
        return

    path=None
    if project.export_path and not ask:
        path=project.export_path
    else:
        path = tkinter.filedialog.askdirectory(
            title="Choose folder where exported pages will be saved"
        )
        if path=="" or path==():
            return

    canvas_editor.save_char()
    try:
        project.export(path)
    except IOError as e:
        tkinter.messagebox.showerror("Exporting project",f"Failed to export project: {e}")


def button_prev_glyph_click():
    global canvas_editor
    global project
    if not project.loaded:
        return
    canvas_editor.prev_glyph()
    update_glyph_preview()

def button_next_glyph_click():
    global canvas_editor
    global project
    if not project.loaded:
        return
    canvas_editor.next_glyph()
    update_glyph_preview()


def button_glyph_search_click():
    global canvas_editor
    global entry_glyph_id
    global project
    if not project.loaded:
        return
    code=entry_glyph_id.get()
    canvas_editor.save_char()
    try:
        canvas_editor.current_char=int(code,base=16)
    except ValueError as e:
        tkinter.messagebox.showerror("Searching glyph", f"Invalid hex value {code}: {e}")
    finally:
        canvas_editor.keep_current_char_in_bounds()
        canvas_editor.load_char()
        update_glyph_preview()


def number_only_validate(val):
    return val.isdigit()


def hex_only_validate(val):
    for x in val:
        if not x.isdigit() and (ord(x)<ord("a") or ord(x)>ord("f")) and (ord(x)<ord("A") or ord(x)>ord("F")):
            return False
    return True


def update_glyph_preview():
    global canvas_editor
    global canvas_preview
    global label_glyph_name
    canvas_preview.delete("all")
    canvas_preview.create_text((50,100),text=chr(canvas_editor.current_char),fill="white",font="tkDefaultFont 70")
    name=unicodedata.name(chr(canvas_editor.current_char),"unknown")
    label_glyph_name.config(text=f"{name} U+{canvas_editor.current_char:04x}")


def canvas_editor_handle_scroll(delta):
    global canvas_editor
    global project
    if not project.loaded:
        return
    if delta>0:
        canvas_editor.prev_glyph()
    else:
        canvas_editor.next_glyph()
    update_glyph_preview()


window=tkinter.Tk()
window.title("fonteditor")
window.geometry(f"{WINDOW_SIZE[0]}x{WINDOW_SIZE[1]}")

menubar=tkinter.Menu(window)
menu_file=tkinter.Menu(menubar,tearoff=False)
menu_file.add_command(label="New project",command=menu_file_new_project_click)
menu_file.add_command(label="Open project",command=menu_file_open_project_click)
menu_file.add_command(label="Open last project",command=menu_file_open_last_project_click)
menu_file.add_command(label="Save project",command=lambda: save_project(False))
menu_file.add_command(label="Save project as",command=lambda: save_project(True))
menu_export=tkinter.Menu(menubar,tearoff=False)
menu_export.add_command(label="Export",command=lambda: export_project(False))
menu_export.add_command(label="Export as",command=lambda: export_project(True))
menu_view=tkinter.Menu(menubar,tearoff=False)
menu_view.add_command(label="Zoom in",command=lambda: canvas_editor.zoom_by(10))
menu_view.add_command(label="Zoom out",command=lambda: canvas_editor.zoom_by(-10))
menubar.add_cascade(label="File",menu=menu_file)
menubar.add_cascade(label="Export",menu=menu_export)
menubar.add_cascade(label="View",menu=menu_view)

canvas_editor=EditorCanvas(project,window,bg="black")
canvas_editor.pack(side="left",fill="both",expand=True)
if platform.system()=="Windows" or platform.system()=="Darwin":
    canvas_editor.bind("<MouseWheel>",lambda event: canvas_editor_handle_scroll(event.delta))
else:
    # This will probably work only on X11
    canvas_editor.bind("<Button-4>",lambda _: canvas_editor_handle_scroll(1))
    canvas_editor.bind("<Button-5>",lambda _: canvas_editor_handle_scroll(-1))

frame_controls=tkinter.Frame(window)
frame_controls.pack(side="right")

canvas_preview=tkinter.Canvas(frame_controls,width=100,height=200,bg="black")
canvas_preview.pack(side="top")

label_glyph_name=tkinter.Label(frame_controls)
label_glyph_name.pack(side="top")

frame_nav=tkinter.Frame(frame_controls)
frame_nav.pack(side="top",pady=10)

button_prev_glyph=tkinter.Button(frame_nav,width=10,text="Previous",command=button_prev_glyph_click)
button_prev_glyph.pack(side="left")

button_next_glyph=tkinter.Button(frame_nav,width=10,text="Next",command=button_next_glyph_click)
button_next_glyph.pack(side="left")

frame_glyph_id=tkinter.Frame(frame_controls)
frame_glyph_id.pack(side="top",pady=10)

entry_glyph_id=tkinter.Entry(frame_glyph_id,validate="all",validatecommand=((window.register(hex_only_validate)),"%P"))
entry_glyph_id.pack(side="left")

button_glyph_search=tkinter.Button(frame_glyph_id,width=10,text="Search",command=button_glyph_search_click)
button_glyph_search.pack(side="left")

window.config(menu=menubar)
window.mainloop()