#!/usr/bin/python3

import os
from datetime import datetime
from mimetypes import MimeTypes
from Whatsapp_Chat_Exporter.data_model import ChatStore, Message
from Whatsapp_Chat_Exporter.utility import Device


def messages(path, data, assume_first_as_me=False):
    """Extracts messages from the exported file"""
    with open(path, "r", encoding="utf8") as file:
        you = ""
        data["ExportedChat"] = ChatStore(Device.EXPORTED)
        chat = data["ExportedChat"]
        total_row_number = len(file.readlines())
        file.seek(0)
        for index, line in enumerate(file):
            if len(line.split(" - ")) > 1:
                time = line.split(" - ")[0]
                if ":" not in line.split(time)[1]:
                    msg.data = line.split(time)[1][3:]
                    msg.meta = True
                else:
                    name = line.split(time)[1].split(":")[0]
                    message = line.split(time)[1].split(name + ":")[1].strip()
                    name = name[3:]
                    if you == "":
                        if chat.name is None:
                            if not assume_first_as_me:
                                while True:
                                    ans = input(f"Is '{name}' you? (Y/N)").lower()
                                    if ans == "y":
                                        you = name
                                        break
                                    elif ans == "n":
                                        chat.name = name
                                        break
                            else:
                                you = name
                        else:
                            if name != chat.name:
                                you = name
                    elif chat.name is None:
                        if name != you:
                            chat.name = name
                    msg = Message(
                        you == name,
                        datetime.strptime(time, "%d/%m/%Y, %H:%M").timestamp(),
                        time.split(", ")[1].strip(),
                        index
                    )
                    if "<Media omitted>" in message:
                        msg.data = "The media is omitted in the chat"
                        msg.mime = "media"
                        msg.meta = True
                    elif "(file attached)" in message:
                        mime = MimeTypes()
                        msg.media = True
                        file_path = os.path.join(os.path.dirname(path), message.split("(file attached)")[0].strip())
                        if os.path.isfile(file_path):
                            msg.data = file_path
                            guess = mime.guess_type(file_path)[0]
                            if guess is not None:
                                msg.mime = guess
                            else:
                                msg.mime = "application/octet-stream"
                        else:
                            msg.data = "The media is missing"
                            msg.mime = "media"
                            msg.meta = True
                    else:
                        msg.data = message
                        if "\r\n" in message:
                            msg.data = message.replace("\r\n", "<br>")
                        if "\n" in message:
                            msg.data = message.replace("\n", "<br>")
                chat.add_message(index, msg)
            else:
                lookback = index - 1
                while lookback not in chat.messages:
                    lookback -= 1
                msg = chat.messages[lookback]
                if msg.media:
                    msg.caption = line.strip()
                else:
                    msg.data += "<br>" + line.strip()
            
            if index % 1000 == 0:
                print(f"Processing messages & media...({index}/{total_row_number})", end="\r")
    print(f"Processing messages & media...({total_row_number}/{total_row_number})", end="\r")
    return data