import json
from http.client import HTTPResponse
from pathlib import Path
from shutil import copyfileobj
from urllib.request import urlopen

import brotli
import msgpack
import psycopg

from com import Visibility, eval_config, parse_graph, progressbar

config = eval_config()
conn: psycopg.Connection = config["connect"]()

graph = parse_graph()
print("reading filterlist")
filtered = Path("filtered.list").read_text().strip().splitlines()

collected_users = {}
def collect_user(id: str):
    if id in collected_users:
        return
    user = conn.execute('select username, host, "avatarUrl" from "user" where id = %s', [id]).fetchone()
    if user is None:
        return None
    username, host, avatar_url = user
    profile = conn.execute('select description, fields from user_profile where "userId" = %s', [id]).fetchone()
    description, fields = profile or ("", [])

    output = {}
    output["id"] = id
    output["username"] = username
    output["host"] = host
    output["description"] = description
    output["fields"] = fields
    output["avatar_url"] = avatar_url

    collected_users[id] = output

collected_notes = []
files_to_collect = []
def collect_note(id: str):
    output = {}
    output["id"] = id

    note = conn.execute('select text, "userId", "createdAt", "updatedAt", reactions, "renoteCount", visibility, "fileIds" from note where id = %s', [id]).fetchone()
    if note is None:
        return None
    text, user_id, created_at, updated_at, reactions, renotes, visibility, file_ids = note
    collect_user(user_id)

    output["text"] = text
    output["user_id"] = user_id
    output["created_at"] = created_at.astimezone(tz=None).isoformat()
    output["updated_at"] = None
    if updated_at is not None:
        output["updated_at"] = updated_at.astimezone(tz=None).isoformat()
    output["reactions"] = reactions
    output["renotes"] = renotes
    output["visibility"] = Visibility.from_db(visibility).code()

    node = graph[id]
    replies = [collect_note(reply) for reply in node["replies"]]
    replies = filter(lambda reply: reply is not None, replies)
    quotes = [collect_note(quote) for quote in node["quotes"]]
    quotes = filter(lambda quote: quote is not None, quotes)

    output["attachments"] = []
    for file_id in file_ids:
        name, type_, comment, url = conn.execute('select name, type, comment, url from drive_file where id = %s', [file_id]).fetchone()
        attachment = {
            "id": file_id,
            "type": type_,
            "comment": comment,
        }
        if "self" in node["flags"]: # archive own attachments
            files_to_collect.append((file_id, url))
            attachment["url"] = None
        else:
            attachment["url"] = url

    output["replies"] = list(replies)
    output["quotes"] = list(quotes)

    if len(output["attachments"]) == 0: del output["attachments"]
    if len(output["replies"]) == 0: del output["replies"]
    if len(output["quotes"]) == 0: del output["quotes"]

    return output

pb = progressbar.ProgressBar(
    0,
    len(filtered),
    prefix="collecting data ",
)
for id in filtered:
    note = collect_note(id)
    collected_notes.append((id, note))
    pb.increment()
pb.finish()

outdir = Path("out")
if not outdir.exists():
    outdir.mkdir()
if not (outdir / "note").exists():
    (outdir / "note").mkdir()
if not (outdir / "user").exists():
    (outdir / "user").mkdir()
if not (outdir / "file").exists():
    (outdir / "file").mkdir()

pb = progressbar.ProgressBar(
    0,
    len(collected_notes) + len(collected_users),
    prefix="writing data ",
)

for id, note in collected_notes:
    outfile = outdir / "note" / f"{id}.mpk.br"
    with outfile.open("wb") as f:
        f.write(brotli.compress(msgpack.dumps(note)))
    pb.increment()

for id, user in collected_users.items():
    outfile = outdir / "user" / f"{id}.mpk.br"
    with outfile.open("wb") as f:
        f.write(brotli.compress(msgpack.dumps(note)))
    pb.increment()
pb.finish()

pb = progressbar.ProgressBar(
    0,
    len(files_to_collect),
    prefix="downloading attachments ",
)
for (id, url) in files_to_collect: 
    outfile = outdir / "file" / id
    response: HTTPResponse = urlopen(url)
    with outfile.open("wb") as f:
        copyfileobj(response, f)
    response.close()
    pb.increment()
pb.finish()