import os
from datetime import datetime
from flask import current_app as app
import re
import sys
import json
import stat
import time
import sqlite3
from .misc import *
from .crypt import *


def get_db():
    db = sqlite3.connect(os.getenv("FLASK_DB"), timeout=5)
    c = db.cursor()
    return db, c


def db_store_file(token, name, expires, max_dl):
    db, c = get_db()
    c.execute(
        """
        insert into files(token,name,added,expires,downloads,max_downloads)
                values (?,?,?,?,?,?)
                """,
        (token, name, int(time.time()), expires, 0, max_dl),
    )
    if c.rowcount > 0:
        db.commit()
    return


def db_get_file(token, name):
    db, c = get_db()
    return db.execute(
        """
        SELECT added,expires,downloads,max_downloads
        FROM files WHERE token = ? AND name = ?
                """,
        (token, name),
    ).fetchone()

def db_get_files():
    db, c = get_db()
    return db.execute(
        """
        SELECT token,name,added,expires,downloads,max_downloads
        FROM files
        WHERE expires > ? and downloads < max_downloads
                """,
        (time.time(),),
    )


def db_delete_file(token, name):
    db, c = get_db()
    c.execute(
        """
        DELETE FROM files WHERE token = ? and name = ?
        """,
        (token, name),
    )
    if c.rowcount > 0:
        db.commit()


def db_add_download(token, name):
    db, c = get_db()
    c.execute(
        """
        UPDATE files SET downloads = downloads + 1 WHERE token = ? AND name = ?
    """,
        (token, name),
    )
    if c.rowcount > 0:
        db.commit()
    return


def file_autoremove():
    db, c = get_db()
    rows = db.execute(
        """
            select
              token, name
            from files
            where expires > ? or downloads >= max_downloads
            """,
        (int(time.time()),),
    )
    deleted_tokens = []
    for row in rows:
        try:
            os.remove(os.path.join(os.getenv("DATAFOLDER"), row[0], row[1]))
        except FileNotFoundError:
            pass
        try:
            os.rmdir(os.path.join(os.getenv("DATAFOLDER"), row[0]))
        except FileNotFoundError:
            pass
        deleted_tokens.append(row[0])
    if len(deleted_tokens) > 0:
        db, c = get_db()
        for token in deleted_tokens:
            c.execute(
                """
                    DELETE FROM files WHERE token = ?
                """,
                (token,),
            )
        db.commit()
    return


def file_age(path):
    now = datetime.now()
    then = datetime.fromtimestamp(os.stat(path).st_mtime)
    diff = now - then
    return (
        diff,
        "%03d d %s"
        % (diff.days, datetime.utcfromtimestamp(diff.seconds).strftime("%H:%M:%S")),
    )


def file_details(token, name):
    full_path = os.path.join(os.getenv("FLASK_DATAFOLDER"), token, name)
    try:
        s = os.stat(full_path)
        db_stat = db_get_file(token, name)
        if db_stat:
            added, expires, downloads, max_dl = db_stat
        else:
            return {}
        return {
            "size": file_size_MB(s.st_size),
            "hsize": file_size_human(s.st_size, HTML=False),
            "added": file_date_human(added),
            "name": name,
            "url": f"{app.config['PUBLIC_URL']}/dl/{token}/{name}",
            "expires": file_date_human(expires),
            "downloaded": downloads,
            "max-dl": max_dl,
        }
    except FileNotFoundError:
        return {}

def file_list():

    files = list(db_get_files())
    details = []
    maxlen = 4
    for file in files:
        maxlen = max(maxlen, len(file[1]))
    details = []
    details.append(
        "Added/Expiry  DL/MaxDL  URL"
    )
    details.append("=" * 75)
    for file in files:
        details.append(
            " ".join((
            str(file[2]),str(file[3]),str(file[4]),str(file[5]),
            f"{app.config['PUBLIC_URL']}/dl/{file[0]}/{file[1]}"
            ))
        )

    return details


def get_expiring_file(ehash):
    connection = apsw.Connection(app.config["SQLITE_FILE"])
    cursor = connection.cursor()

    for row in cursor.execute(
        "SELECT file, expires FROM expiring WHERE hash = ?", (ehash,)
    ):
        return row[0], row[1]
    return None, None


def get_script_url(public_url, share, end_point, token="[TOKEN]"):
    cmd = None
    doc = None
    if get_or_none("direct_links", share) and end_point == "download":
        end_point = "direct"
    url = "%s/script/%s/%s/%s" % (public_url, end_point, share["name"], token)
    if end_point in ("download", "direct"):
        cmd = "curl -s %s | bash /dev/stdin [-f]" % (url,)
        doc = "Download all files in the share. -f to force overwrite existing files."
    if end_point == "client":
        cmd = "python <( curl -s %s )" % (url,)
        doc = "Console client to download and upload files."
    if end_point == "upload_split":
        cmd = (
            "curl -s %s | python - [-s split_size_in_Mb] file_to_upload.ext [second.file.ext]"
            % (url,)
        )
        doc = "Upload files to the share. -s to set splitting size."
    if end_point == "flip":
        cmd = "curl -s %s > flip && ./flip" % (url,)
        doc = "Use the share as a command line clipboard"
    return {"cmd": cmd, "doc": doc}


def set_expiring_file(share, filename, expires):
    connection = apsw.Connection(app.config["SQLITE_FILE"])
    cursor = connection.cursor()

    while True:
        ehash = random_expiring_hash()
        matches = len(
            list(cursor.execute("SELECT file FROM expiring WHERE hash = ?", (ehash,)))
        )
        if matches == 0:
            break

    cursor.execute(
        "INSERT INTO expiring (hash, file, expires) VALUES (?,?,?)",
        (ehash, filename, expires),
    )
    return "/".join((app.config["PUBLIC_URL"], "e", ehash, os.path.basename(filename)))


def remove_expiring_file(share, filename):
    connection = apsw.Connection(app.config["SQLITE_FILE"])
    cursor = connection.cursor()

    cursor.execute("DELETE FROM expiring WHERE file = ?", (filename,))