"""SQLite persistence for Telegram download records."""

import json
import os
import sqlite3
from dataclasses import asdict, dataclass
from datetime import datetime, timezone
from typing import Optional, Tuple

from module.app import DownloadStatus
from module.pyrogram_extension import get_extension


@dataclass
class DownloadRecord:
    """One persisted Telegram download outcome."""

    chat_id: str
    message_id: int
    download_status: str
    chat_title: Optional[str] = None
    message_date: Optional[str] = None
    message_thread_id: Optional[int] = None
    topic_id: Optional[int] = None
    reply_to_message_id: Optional[int] = None
    media_group_id: Optional[str] = None
    sender_id: Optional[str] = None
    sender_name: Optional[str] = None
    media_type: Optional[str] = None
    caption: Optional[str] = None
    message_text: Optional[str] = None
    file_id: Optional[str] = None
    file_unique_id: Optional[str] = None
    original_file_name: Optional[str] = None
    file_extension: Optional[str] = None
    mime_type: Optional[str] = None
    file_size: Optional[int] = None
    width: Optional[int] = None
    height: Optional[int] = None
    duration: Optional[int] = None
    stored_file_name: Optional[str] = None
    local_path: Optional[str] = None
    relative_path: Optional[str] = None
    original_save_path: Optional[str] = None
    nfo_path: Optional[str] = None
    error_message: Optional[str] = None
    retry_count: int = 0
    downloaded_at: Optional[str] = None
    created_at: Optional[str] = None
    updated_at: Optional[str] = None
    extra_json: Optional[str] = None


MEDIA_ATTRS = (
    "audio",
    "document",
    "photo",
    "sticker",
    "animation",
    "video",
    "voice",
    "video_note",
    "new_chat_photo",
)


SCHEMA = """
CREATE TABLE IF NOT EXISTS download_records (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    chat_id TEXT NOT NULL,
    chat_title TEXT,
    message_id INTEGER NOT NULL,
    message_date TEXT,
    message_thread_id INTEGER,
    topic_id INTEGER,
    reply_to_message_id INTEGER,
    media_group_id TEXT,
    sender_id TEXT,
    sender_name TEXT,
    media_type TEXT,
    caption TEXT,
    message_text TEXT,
    file_id TEXT,
    file_unique_id TEXT,
    original_file_name TEXT,
    file_extension TEXT,
    mime_type TEXT,
    file_size INTEGER,
    width INTEGER,
    height INTEGER,
    duration INTEGER,
    stored_file_name TEXT,
    local_path TEXT,
    relative_path TEXT,
    original_save_path TEXT,
    nfo_path TEXT,
    download_status TEXT NOT NULL,
    error_message TEXT,
    retry_count INTEGER NOT NULL DEFAULT 0,
    downloaded_at TEXT,
    created_at TEXT NOT NULL,
    updated_at TEXT NOT NULL,
    extra_json TEXT,
    UNIQUE(chat_id, message_id)
)
"""


def utc_now() -> str:
    """Return a compact UTC timestamp for database rows."""
    return (
        datetime.now(timezone.utc)
        .replace(microsecond=0)
        .isoformat()
        .replace("+00:00", "Z")
    )


def get_database_path(save_path: str) -> str:
    """Return the SQLite path under the configured download root."""
    return os.path.join(save_path, "download_records.sqlite3")


def init_database(db_path: str):
    """Create the records database and table if needed."""
    os.makedirs(os.path.dirname(db_path), exist_ok=True)
    with sqlite3.connect(db_path) as conn:
        conn.execute(SCHEMA)
        conn.commit()


def status_to_text(status: DownloadStatus) -> str:
    """Map internal enum values to persisted status text."""
    if status is DownloadStatus.SuccessDownload:
        return "success"
    if status is DownloadStatus.SkipDownload:
        return "skip"
    if status is DownloadStatus.FailedDownload:
        return "failed"
    return "failed"


def find_message_media(message) -> Tuple[Optional[str], Optional[object]]:
    """Return the first media type/object present on the message."""
    for media_type in MEDIA_ATTRS:
        media_obj = getattr(message, media_type, None)
        if media_obj is not None:
            return media_type, media_obj
    if getattr(message, "text", None):
        return "text", None
    return None, None


def isoformat(value) -> Optional[str]:
    """Safely convert datetime-like values to ISO strings."""
    if not value:
        return None
    if hasattr(value, "isoformat"):
        return value.isoformat()
    return str(value)


def get_file_extension(media_obj) -> Optional[str]:
    """Return an extension without the leading dot."""
    if media_obj is None:
        return None
    original_file_name = getattr(media_obj, "file_name", None)
    if original_file_name:
        _, suffix = os.path.splitext(os.path.basename(original_file_name))
        if suffix:
            return suffix.lstrip(".")
    file_id = getattr(media_obj, "file_id", "")
    mime_type = getattr(media_obj, "mime_type", "")
    try:
        extension = get_extension(file_id, mime_type, False)
    except Exception:
        return None
    return extension or None


def get_sender_identity(message) -> Tuple[Optional[str], Optional[str]]:
    """Return sender id/name from user or sender chat metadata."""
    from_user = getattr(message, "from_user", None)
    if from_user:
        sender_id = getattr(from_user, "id", None)
        username = getattr(from_user, "username", None)
        name_parts = [
            getattr(from_user, "first_name", None),
            getattr(from_user, "last_name", None),
        ]
        sender_name = username or " ".join(part for part in name_parts if part) or None
        return str(sender_id) if sender_id is not None else None, sender_name

    sender_chat = getattr(message, "sender_chat", None)
    if sender_chat:
        sender_id = getattr(sender_chat, "id", None)
        sender_name = (
            getattr(sender_chat, "title", None)
            or getattr(sender_chat, "username", None)
            or None
        )
        return str(sender_id) if sender_id is not None else None, sender_name

    return None, None


def build_download_record(
    app,
    node,
    message,
    download_status: DownloadStatus,
    local_path: Optional[str] = None,
    nfo_path: Optional[str] = None,
    error_message: Optional[str] = None,
) -> DownloadRecord:
    """Build a database record from a message and final download outcome."""
    media_type, media_obj = find_message_media(message)
    chat = getattr(message, "chat", None)
    sender_id, sender_name = get_sender_identity(message)
    local_path = local_path or None
    now = utc_now()
    relative_path = None
    stored_file_name = None
    if local_path:
        stored_file_name = os.path.basename(local_path)
        try:
            relative_path = os.path.relpath(local_path, app.save_path)
        except ValueError:
            relative_path = local_path

    message_thread_id = getattr(message, "message_thread_id", None)

    caption = getattr(message, "caption", None)
    if not caption and getattr(message, "media_group_id", None):
        caption = app.get_caption_name(node.chat_id, message.media_group_id)

    extra = {}
    if media_obj is not None and hasattr(media_obj, "date"):
        extra["media_date"] = isoformat(getattr(media_obj, "date"))

    return DownloadRecord(
        chat_id=str(node.chat_id),
        chat_title=getattr(chat, "title", None),
        message_id=int(message.id),
        message_date=isoformat(getattr(message, "date", None)),
        message_thread_id=message_thread_id,
        topic_id=message_thread_id,
        reply_to_message_id=getattr(message, "reply_to_message_id", None),
        media_group_id=getattr(message, "media_group_id", None),
        sender_id=sender_id,
        sender_name=sender_name,
        media_type=media_type,
        caption=caption,
        message_text=getattr(message, "text", None),
        file_id=getattr(media_obj, "file_id", None) if media_obj is not None else None,
        file_unique_id=getattr(media_obj, "file_unique_id", None)
        if media_obj is not None
        else None,
        original_file_name=getattr(media_obj, "file_name", None)
        if media_obj is not None
        else None,
        file_extension=get_file_extension(media_obj),
        mime_type=getattr(media_obj, "mime_type", None) if media_obj is not None else None,
        file_size=getattr(media_obj, "file_size", None) if media_obj is not None else None,
        width=getattr(media_obj, "width", None) if media_obj is not None else None,
        height=getattr(media_obj, "height", None) if media_obj is not None else None,
        duration=getattr(media_obj, "duration", None) if media_obj is not None else None,
        stored_file_name=stored_file_name,
        local_path=local_path,
        relative_path=relative_path,
        original_save_path=app.save_path,
        nfo_path=nfo_path,
        download_status=status_to_text(download_status),
        error_message=error_message,
        retry_count=0,
        downloaded_at=now if download_status is DownloadStatus.SuccessDownload else None,
        created_at=now,
        updated_at=now,
        extra_json=json.dumps(extra, ensure_ascii=False) if extra else None,
    )


def upsert_download_record(db_path: str, record: DownloadRecord):
    """Insert or update one download record."""
    init_database(db_path)
    data = asdict(record)
    columns = list(data.keys())
    placeholders = ", ".join(["?"] * len(columns))
    column_sql = ", ".join(columns)
    update_columns = [
        column
        for column in columns
        if column not in {"chat_id", "message_id", "created_at"}
    ]
    update_sql = ", ".join([f"{column}=excluded.{column}" for column in update_columns])
    sql = (
        f"INSERT INTO download_records ({column_sql}) VALUES ({placeholders}) "
        f"ON CONFLICT(chat_id, message_id) DO UPDATE SET {update_sql}"
    )
    with sqlite3.connect(db_path) as conn:
        conn.execute(sql, [data[column] for column in columns])
        conn.commit()