import json
import typer
from pathlib import Path
import requests
from tqdm import tqdm
import xml.etree.ElementTree as ET
from typing_extensions import Annotated
import sqlite3

app = typer.Typer()

def get_safe_path(s: str) -> str:
    """
    Remove invalid characters to sanitize a path.
    :param s: str to sanitize
    :returns: sanitized str
    """
    ban_chars = "\\  /  :  *  ?  \"  '  <  >  |  $  \r  \n".replace(
        ' ', '')
    for i in ban_chars:
        s = s.replace(i, "")
    return s


def process_history(history: str):
    if history.startswith("<?xml") or history.startswith("<msg>"):
        try:
            root = ET.fromstring(history)
            title = root.find('.//title').text if root.find('.//title') is not None else None
            quoted = root.find('.//refermsg/content').text if root.find('.//refermsg/content') is not None else None
            if title and quoted:
                return {
                    "title": title,
                    "quoted": process_history(quoted)
                }
            if title:
                return title
        except Exception:
            return history
    return history

def get_message(history: dict | str):
    if isinstance(history, dict):
        if 'title' in history:
            return history['title']
    else:
        return history

def export_chathistory(user_id: str):
    res = requests.get("http://localhost:48065/wechat/chatlog", params={
        "userId": user_id,
        "count": 100000
    }).json()
    for i in range(len(res['chatLogs'])):
        res['chatLogs'][i]['content'] = process_history(res['chatLogs'][i]['content'])
        res['chatLogs'][i]['message'] = get_message(res['chatLogs'][i]['content'])
    return res['chatLogs']

@app.command()
def export_all(dest: Annotated[Path, typer.Argument(help="Destination path to export to.")]):
    """
    Export all users' chat history to json files.
    """
    if not dest.is_dir():
        if not dest.exists():
            inp = typer.prompt("Destination path does not exist, create it? (y/n)")
            if inp.lower() == 'y':
                dest.mkdir(parents=True)
            else:
                typer.echo("Aborted.", err=True)
                return
        else:
            typer.echo("Destination path is not a directory!", err=True)
            return
    all_users = requests.get("http://localhost:48065/wechat/allcontacts").json()

    exported_count = 0
    for user in tqdm(all_users):
        try:
            usr_chatlog = export_chathistory(user['arg'])
            
            # Only write file if there are messages
            if len(usr_chatlog) > 0:
                out_path = dest/get_safe_path((user['title'] or "")+"-"+user['arg']+'.json')
                with open(out_path, 'w', encoding='utf-8') as f:
                    json.dump(usr_chatlog, f, ensure_ascii=False, indent=2)
                exported_count += 1
        except Exception as e:
            print(f"Error exporting {user.get('title', 'Unknown')}: {e}")
            continue

    print(f"Exported {exported_count} users' chat history to {dest} in json.")

@app.command()
def export_sqlite(dest: Annotated[Path, typer.Argument(help="Destination path to export to.")] = Path("chatlog.db")):
    """
    Export all users' chat history to a sqlite database.
    """
    connection = sqlite3.connect(dest)
    cursor = connection.cursor()
    cursor.execute("CREATE TABLE IF NOT EXISTS chatlog (id INTEGER PRIMARY KEY AUTOINCREMENT, with_id TEXT, from_user TEXT, to_user TEXT, message TEXT, timest DATETIME, auxiliary TEXT)")
    cursor.execute("CREATE INDEX IF NOT EXISTS chatlog_with_id_index ON chatlog (with_id)")
    cursor.execute("CREATE TABLE iF NOT EXISTS users (id TEXT PRIMARY KEY, name TEXT)")

    all_users = requests.get("http://localhost:48065/wechat/allcontacts").json()
    for user in tqdm(all_users):
        cursor.execute("INSERT OR IGNORE INTO users (id, name) VALUES (?, ?)", (user['arg'], user['title']))
        usr_chatlog = export_chathistory(user['arg'])
        for msg in usr_chatlog:
            cursor.execute("INSERT INTO chatlog (with_id, from_user, to_user, message, timest, auxiliary) VALUES (?, ?, ?, ?, ?, ?)", (user['arg'], msg['fromUser'], msg['toUser'], msg['message'], msg['createTime'], str(msg['content'])))
    connection.commit()


if __name__ == "__main__":
    app()