#!/usr/bin/env python
# Copyright 2000 by Thomas Sicheritz-Ponten.
# Copyright 2016 by Markus Piotrowski.
# All rights reserved.
# This code is part of the Biopython distribution and governed by its
# license.  Please see the LICENSE file that should have been included
# as part of this package.

# Created: Wed Jun 21 10:28:14 2000
# thomas@cbs.dtu.dk, http://www.cbs.dtu.dk/thomas

"""Widget code for graphical Xbbtools tool."""

from __future__ import print_function

import re
import sys
import time

try:  # Python 2
    import Tkinter as tk
    import ttk
    import tkFileDialog as filedialog
except ImportError:  # Python 3
    import tkinter as tk
    import tkinter.ttk as ttk
    from tkinter import filedialog

from Bio.Data import CodonTable
from Bio.SeqIO.FastaIO import SimpleFastaParser

from xbb_utils import NotePad
from xbb_translations import xbb_translations
from xbb_blast import BlastIt
from xbb_search import XDNAsearch
from xbb_help import xbbtools_help


class xbb_widget(object):
    """Main XBBtools window."""

    def __init__(self, parent=None):
        """Set up main window."""
        self.is_a_master = (parent is None)
        self.parent = parent

        self.init_variables()

        # master frame
        self.main_frame = ttk.Frame(parent)
        if not parent:
            self.parent = self.main_frame.master
            self.parent.option_add("*tearOff", 0)

        self.main_frame.pack(fill="both", expand=1)

        # sequence info (GC%, positins etc.)
        self.info_frame = ttk.Frame(self.main_frame)
        self.info_frame.pack(fill="both", expand=1)

        self.create_menu(self.info_frame)
        self.create_seqinfo(self.info_frame)

        # sequence field and fast buttons
        self.seq_frame = ttk.Frame(self.main_frame)
        self.seq_frame.pack(fill="both", expand=1)

        self.create_buttons(self.seq_frame)
        self.create_seqfield(self.seq_frame)

        self.create_bindings()
        self.blastit = "xbb_blast.py"

    def init_variables(self):
        """Set up some standard values."""
        self.seqwidth = 60
        self.translation_tables = {}
        for i, table in CodonTable.unambiguous_dna_by_id.items():
            self.translation_tables[table.names[0]] = i
        self.translator = xbb_translations()

    def create_menu(self, parent):
        """Create the main menu bar."""
        self.menubar = tk.Menu(self.main_frame)

        # File menu
        self.file_menu = tk.Menu(self.menubar)
        menu = self.file_menu
        menu.add_command(label="Open", command=self.open)
        menu.add_command(label="Exit", command=self.exit)
        self.menubar.add_cascade(label="File", menu=self.file_menu)

        # Edit menu
        self.edit_menu = tk.Menu(self.menubar)
        menu = self.edit_menu
        menu.add_command(label="Complement", command=self.complement)
        menu.add_command(label="Antiparallel", command=self.antiparallel)
        menu.add_command(label="Reverse", command=self.reverse)
        menu.add_command(label="Fix sequence", command=self.fix_sequence)
        menu.add_command(label="Search", command=self.search)
        self.menubar.add_cascade(label="Edit", menu=self.edit_menu)

        # Translation menu
        self.translation_menu = tk.Menu(self.menubar)

        self.gencode_menu = tk.Menu(self.translation_menu)
        self.frame_menu = tk.Menu(self.translation_menu)

        menu = self.translation_menu
        menu.add_cascade(label="Genetic Codes", menu=self.gencode_menu)
        menu.add_cascade(label="Frame", menu=self.frame_menu)
        menu.add_separator()
        menu.add_command(label="Single frame translation",
                         command=self.translate)
        menu.add_command(label="Three frame translation (+)",
                         command=lambda: self.gcframe(direction="plus"))
        menu.add_command(label="Three frame translation (-)",
                         command=lambda: self.gcframe(direction="minus"))
        menu.add_command(label="Six frame translation", command=self.gcframe)
        menu.add_command(label="Extract to FASTA", command=self.extract)

        # Frames submenu
        self.frame_int = tk.IntVar()
        menu = self.frame_menu
        menu.add_radiobutton(label="+1", variable=self.frame_int, value=1)
        menu.add_radiobutton(label="+2", variable=self.frame_int, value=2)
        menu.add_radiobutton(label="+3", variable=self.frame_int, value=3)
        menu.add_radiobutton(label="-1", variable=self.frame_int, value=-1)
        menu.add_radiobutton(label="-2", variable=self.frame_int, value=-2)
        menu.add_radiobutton(label="-3", variable=self.frame_int, value=-3)
        self.frame_int.set(1)

        # Codon tables submenu
        self.current_codon_table = tk.StringVar()
        self.current_codon_table.set("Standard")
        self.current_codon_table_id = 1

        keys = list(self.translation_tables.keys())
        keys.remove("Standard")
        keys.sort()
        keys = ["Standard"] + keys

        menu = self.gencode_menu
        for table in keys:
            menu.add_radiobutton(label=table,
                                 command=self.set_codon_table,
                                 variable=self.current_codon_table)

        self.menubar.add_cascade(label="Translations",
                                 menu=self.translation_menu)

        # Tools menu
        self.tools_menu = tk.Menu(self.menubar)
        menu = self.tools_menu
        menu.add_command(label="Blast", command=self.blast)
        menu.add_command(label="Stats", command=self.statistics)
        self.menubar.add_cascade(label="Tools", menu=self.tools_menu)

        # Help menu
        self.help_menu = tk.Menu(self.menubar)
        menu = self.help_menu
        menu.add_command(label="Help", command=lambda: xbbtools_help())
        self.menubar.add_cascade(label="Help", menu=self.help_menu)

        self.parent.config(menu=self.menubar)

    def set_codon_table(self):
        """Set codon table to selection in Translations menu."""
        self.current_codon_table_id = \
            self.translation_tables[self.current_codon_table.get()]

    def exit(self, *args):
        """Close the program."""
        # depending on if this widget is the first created or a child widget
        if self.is_a_master:
            sys.exit()
        else:
            self.main_frame.destroy()

    def create_seqinfo(self, parent):
        """Set up two info lines at top of main window."""
        # all the sequence information in the top labels
        self.seq_info1 = ttk.Frame(parent, relief="ridge",
                                   borderwidth=5, height=30)
        self.seq_info1.pack(fill="both", expand=1, side="top")

        self.position_ids = {}
        d = self.position_ids
        d["id"] = ttk.Label(self.seq_info1, width=10)
        d["from_id"] = ttk.Label(self.seq_info1, width=10)
        d["to_id"] = ttk.Label(self.seq_info1, width=10)
        d["length_id"] = ttk.Label(self.seq_info1, width=10)
        d["label"] = ttk.Label(self.seq_info1, width=10)
        for i in ["id", "from_id", "to_id", "length_id", "label"]:
            d[i].pack(side="left", fill="both", expand=1)

        self.seq_info2 = ttk.Frame(parent, relief="ridge",
                                   borderwidth=5, height=30)
        self.seq_info2.pack(fill="both", expand=1, side="top")
        self.statistics_ids = {}
        d = self.statistics_ids
        d["length_id"] = ttk.Label(self.seq_info2, width=10)
        d["length_id"].pack(side="left", fill="both", expand=1)
        for nt in ["A", "C", "G", "T"]:
            d[nt] = ttk.Label(self.seq_info2, width=10)
            d[nt].pack(side="left", fill="both", expand=1)

    def create_buttons(self, parent):
        """Set up buttons."""
        self.button_frame = ttk.Frame(parent)
        self.button_frame.pack(fill="y", side="left")
        self.buttons = {}
        for text, func in [("Open", self.open),
                           ("Export", self.export),
                           ("GC Frame", self.gcframe),
                           ("Blast", self.blast),
                           ("Exit", self.exit)]:
            b_id = ttk.Button(self.button_frame, text=text,
                              command=func, width=7)
            b_id.pack(side="top", pady=5, padx=10)
            self.buttons[text] = b_id

        frame = ttk.Frame(self.button_frame)
        label = ttk.Label(frame, text="Goto:")
        label.pack(side="left")
        label.bind("<Button-1>", self.goto)

        self.goto_entry = ttk.Entry(frame, width=5)
        self.goto_entry.pack(side="right", pady=5, padx=4)
        self.goto_entry.bind("<Return>", self.goto)
        frame.pack(side="bottom")

    def create_seqfield(self, parent):
        """Set up the main text field."""
        self.sequence_id = tk.Text(parent, wrap="char", width=self.seqwidth)
        self.sequence_id.pack(fill="both", expand=1, side="right")

    def create_bindings(self):
        """Bind events to commands."""
        self.sequence_id.bind("<Motion>", self.position)
        self.sequence_id.bind("<Leave>", lambda x, s=self:
                              s.position_ids["id"].configure(text=""))
        self.sequence_id.bind("<1>", self.zero)
        self.sequence_id.bind("<B1-Motion>", self.count_selection)
        self.sequence_id.bind("<Double-Button-1>", self.select_all)

    def zero(self, event):
        """Remove selection."""
        for i in ["from_id", "to_id", "length_id"]:
            self.position_ids[i].configure(text="")

    def get_length(self):
        """Return lenght of sequence."""
        self.sequence_length = len(self.sequence_id.get(1.0, "end"))
        return self.sequence_length

    def select_all(self, event):
        """Select the whole sequence."""
        self.select(1, self.get_length())
        self.count_selection(None)

    def select(self, a, b):
        """Select subsequence from a to b."""
        w = self.sequence_id
        w.selection_own()
        w.tag_add("sel", "1.%d" % (a - 1), "1.%d" % b)
        self.count_selection(None)

    def get_selection_or_sequence(self):
        """Return selected sequence or whole sequence (if nothing selected).

        Whitespaces, digits etc. are removed.
        """
        seq = self.get_selection()
        if not len(seq):
            seq = self.sequence_id.get(1.0, "end")

        seq = re.sub("[^A-Z]", "", seq)
        return str(seq)

    def get_selection(self):
        """Return selected sequence or empty text (if nothing selected)."""
        w = self.sequence_id
        try:
            return w.selection_get()
        except tk.TclError:  # Nothing is selected
            return ""

    def get_self_selection(self):
        """Return selected sequence or empty text (if no selection)."""
        # Identical to ``get_selection`` from above. Reason for two methods?
        w = self.sequence_id
        try:
            return w.selection_get()
        except tk.TclError:  # Nothing is selected
            return ""

    def count_selection(self, event):
        """Calculate some data from selected sequence and display it."""
        w = self.sequence_id
        w.selection_own()
        try:
            a = int(w.index("sel.first").split(".")[1]) + 1
            b = int(w.index("sel.last").split(".")[1])
            length = b - a + 1

            self.position_ids["from_id"].configure(text="Start:%d" % a)
            self.position_ids["to_id"].configure(text="Stop:%d" % b)
            self.position_ids["length_id"].configure(text="%d nt" % length)

            self.statistics_ids["length_id"].configure(text="Length=%d"
                                                       % length)
            seq = self.get_self_selection()
            for nt in ["A", "C", "G", "T"]:
                n = seq.count(nt)
                self.statistics_ids[nt].configure(text="%s=%d" % (nt, n))
        except tk.TclError:  # Problem with tag 'sel' when actually selecting
            pass

    def position(self, event):
        """Get position of cursor and display it."""
        x = event.x
        y = event.y
        pos = self.sequence_id.index("@%d,%d" % (x, y)).split(".")
        pos = int(pos[1]) + 1
        self.position_ids["id"].configure(text=str(pos))

    def open(self, file=None):
        """Open a file."""
        if not file:
            file = filedialog.askopenfilename()
        if not file:
            return
        with open(file) as handle:
            self.insert_sequence(next(SimpleFastaParser(handle)))

    def insert_sequence(self, name_sequence):
        """Load new sequence in sequence window."""
        (name, sequence) = name_sequence
        self.sequence_id.delete(0.0, "end")
        self.sequence_id.insert("end", sequence.upper())
        self.fix_sequence()
        self.update_label(name)

    def fix_sequence(self):
        """Do basic formatting of sequence in sequence window."""
        seq = str(self.sequence_id.get(1.0, "end"))
        seq = seq.upper()
        seq = re.sub("[^A-Z]", "", seq)
        self.sequence_id.delete(0.0, "end")
        self.sequence_id.insert("end", seq)

    def update_label(self, header):
        """Update name label."""
        name = header.split(" ")[0]
        name = name.split(",")[0]
        self.position_ids["label"].configure(text=name)

    def export(self):
        """Export selected text to new text window."""
        seq = self.get_selection_or_sequence()
        if not seq:
            return
        np = NotePad()
        tid = np.text_id()
        tid.insert("end", seq)

    def gcframe(self, direction="both"):
        """Run pretty print multiple frame translations."""
        seq = self.get_selection_or_sequence()
        if not seq:
            return
        np = NotePad()
        tid = np.text_id()
        tid.insert("end",
                   self.translator.gcframe(seq, self.current_codon_table_id,
                                           direction))

    def translate(self):
        """Run pretty print single frame translation."""
        seq = self.get_selection_or_sequence()
        frame = self.frame_int.get()
        if not seq:
            return
        np = NotePad()
        tid = np.text_id()
        tid.insert("end",
                   self.translator.frame_nice(seq, frame,
                                              self.current_codon_table_id))

    def extract(self):
        """Make single frame translation and display aa sequence as fasta."""
        seq = self.get_selection_or_sequence()
        frame = self.frame_int.get()
        if not seq:
            return
        aa_seq = self.translator.frame(seq, frame, self.current_codon_table_id)
        aa_seq = re.sub("(.{50})", "\\1\n", str(aa_seq))
        np = NotePad()
        tid = np.text_id()
        tid.insert("end", ">frame%d\n%s" % (frame, aa_seq))

    def statistics(self):
        """Calculate statistics of sequence and display in new window."""
        seq = self.get_selection_or_sequence()
        if not seq:
            return
        seq = seq.upper()
        aa = {"A": 0, "C": 0, "G": 0, "T": 0, "N": 0}
        for nt in seq:
            if nt not in aa:
                nt = "N"
            aa[nt] = aa[nt] + 1

        GC = (100.0 * (aa["G"] + aa["C"])) / len(seq)

        np = NotePad()
        tid = np.text_id()

        tid.insert("end", "%s\n\n" %
                   (time.strftime("%y %b %d, %X\n",
                                  time.localtime(time.time()))) +
                   "Length = %d\nA=%d C=%d G=%d T=%d other=%d\nGC=%f\n\n" %
                   (len(seq), aa["A"], aa["C"], aa["G"], aa["T"], aa["N"], GC))

    def blast(self):
        """Set-up and start BLASTing."""
        seq = self.get_selection_or_sequence()
        self.blaster = BlastIt(seq, self.parent)

    def reverse(self):
        """Display reversed sequence in sequence window."""
        w = self.sequence_id
        w.selection_own()
        try:
            start, stop = w.tag_ranges("sel")
        except ValueError:  # Nothing selected
            start, stop = 1.0, self.sequence_id.index("end")

        seq = w.get(start, stop)
        seq = list(re.sub("[^A-Z]", "", seq))
        seq.reverse()
        seq = "".join(seq)

        w.delete(start, stop)
        w.insert(start, seq)
        w.tag_remove("sel", 1.0, start)
        w.tag_add("sel", start, stop)
        w.tag_remove("sel", stop, "end")

    def complement(self):
        """Display complement of sequence in sequence window."""
        w = self.sequence_id
        w.selection_own()
        try:
            start, stop = w.tag_ranges("sel")
        except ValueError:  # Nothing selected
            start, stop = 1.0, self.sequence_id.index("end")

        seq = str(w.get(start, stop))

        seq = re.sub("[^A-Z]", "", seq)

        complementary = self.translator.complement(seq)
        w.delete(start, stop)
        w.insert(start, complementary)
        w.tag_remove("sel", 1.0, start)
        w.tag_add("sel", start, stop)
        w.tag_remove("sel", stop, "end")

    def antiparallel(self):
        """Display reverse-complemented sequence in sequence window."""
        w = self.sequence_id
        w.selection_own()
        try:
            start, stop = w.tag_ranges("sel")
        except tk.TclError:
            start, stop = 1.0, self.sequence_id.index("end")

        seq = str(w.get(start, stop))
        seq = re.sub("[^A-Z]", "", seq)

        antip = self.translator.antiparallel(seq)
        w.delete(start, stop)
        w.insert(start, antip)
        w.tag_remove("sel", 1.0, start)
        w.tag_add("sel", start, stop)
        w.tag_remove("sel", stop, "end")

    def search(self):
        """Set-up and start search process."""
        seq = self.get_selection_or_sequence()
        XDNAsearch(seq, master=self.sequence_id, highlight=1)

    def goto(self, *args):
        """Place cursor at chosen position.

        You can also select and mark a range by typing e.g. 50:55
        into the Goto entry field.
        """
        pos = self.goto_entry.get()
        try:
            pos = int(pos) - 1
        except ValueError:
            try:
                start, stop = pos.split(":")
                start = int(start) - 1
                stop = int(stop)
                self.mark(start, stop)
                return
            except ValueError:
                import traceback
                traceback.print_exc()

                self.goto_entry.delete(0, "end")
                return

        self.sequence_id.focus()
        self.sequence_id.mark_set("insert", "1.%d" % pos)

    def mark(self, start, stop):
        """Mark and put a tag on choosen subsequence from start to stop."""
        self.sequence_id.focus()
        self.sequence_id.mark_set("insert", "1.%d" % start)
        self.sequence_id.tag_add("sel", "1.%d" % start, "1.%d" % stop)


if __name__ == "__main__":
    win = tk.Tk()
    xbbtools = xbb_widget()
    xbbtools.open("test.fas")
    win.mainloop()
