# ============================================================
# File: db/state_sql.py
# Purpose:
#   Low-level SQLite snapshot layer for BookScraper metadata.
#   Used ONLY through db.repository façade.
# ============================================================

import sqlite3
import os

from logbus.publisher import log

DB_PATH = os.getenv("BOOKSCRAPER_DB", "/app/db/books.db")


# ------------------------------------------------------------
# INTERNAL HELPERS
# ------------------------------------------------------------
def _connect():
    conn = sqlite3.connect(DB_PATH)
    conn.row_factory = sqlite3.Row
    return conn


# ------------------------------------------------------------
# FETCH
# ------------------------------------------------------------
def sql_fetch_book(book_id):
    conn = _connect()
    cur = conn.cursor()
    cur.execute("SELECT * FROM books WHERE book_id = ?", (book_id,))
    row = cur.fetchone()
    conn.close()
    return dict(row) if row else None


def sql_fetch_all_books():
    conn = _connect()
    cur = conn.cursor()
    cur.execute("SELECT * FROM books ORDER BY rowid DESC")
    rows = cur.fetchall()
    conn.close()
    return [dict(r) for r in rows]


# ------------------------------------------------------------
# REGISTER / UPDATE
# ------------------------------------------------------------
def sql_register_book(book_id, fields: dict):
    conn = _connect()
    cur = conn.cursor()

    cols = ", ".join(["book_id"] + list(fields.keys()))
    placeholders = ", ".join(["?"] * (1 + len(fields)))
    values = [book_id] + list(fields.values())

    cur.execute(
        f"INSERT OR REPLACE INTO books ({cols}) VALUES ({placeholders})", values
    )
    conn.commit()
    conn.close()


def sql_update_book(book_id, fields: dict):
    if not fields:
        return

    conn = _connect()
    cur = conn.cursor()

    set_clause = ", ".join([f"{k} = ?" for k in fields])
    params = list(fields.values()) + [book_id]

    cur.execute(f"UPDATE books SET {set_clause} WHERE book_id = ?", params)
    conn.commit()
    conn.close()


# ------------------------------------------------------------
# STATUS
# ------------------------------------------------------------
def sql_set_status(book_id, status: str):
    conn = _connect()
    cur = conn.cursor()
    cur.execute("UPDATE books SET status = ? WHERE book_id = ?", (status, book_id))
    conn.commit()
    conn.close()


# ------------------------------------------------------------
# CHAPTER TOTAL (snapshot)
# ------------------------------------------------------------
def sql_set_chapters_total(book_id, total: int):
    conn = _connect()
    cur = conn.cursor()
    cur.execute(
        "UPDATE books SET chapters_total = ? WHERE book_id = ?", (total, book_id)
    )
    conn.commit()
    conn.close()


# ------------------------------------------------------------
# COUNTERS (SNAPSHOT-ONLY)
# ------------------------------------------------------------
def sql_inc_downloaded(book_id, amount=1):
    conn = _connect()
    cur = conn.cursor()
    cur.execute(
        """
        UPDATE books
        SET downloaded = COALESCE(downloaded,0) + ?
        WHERE book_id = ?
        """,
        (amount, book_id),
    )
    conn.commit()
    conn.close()


def sql_inc_parsed(book_id, amount=1):
    conn = _connect()
    cur = conn.cursor()
    cur.execute(
        """
        UPDATE books
        SET parsed = COALESCE(parsed,0) + ?
        WHERE book_id = ?
        """,
        (amount, book_id),
    )
    conn.commit()
    conn.close()


def sql_inc_audio_done(book_id, amount=1):
    log(f"[DB-SQL] Incrementing audio done for {book_id} by {amount}")
    conn = _connect()
    cur = conn.cursor()
    cur.execute(
        """
        UPDATE books
        SET audio_done = COALESCE(audio_done,0) + ?
        WHERE book_id = ?
        """,
        (amount, book_id),
    )
    conn.commit()
    conn.close()


def sql_inc_audio_skipped(book_id, amount=1):
    log(f"[DB-SQL] Incrementing audio skipped for {book_id} by {amount}")
    conn = _connect()
    cur = conn.cursor()
    cur.execute(
        """
        UPDATE books
        SET audio_skipped = COALESCE(audio_skipped,0) + ?
        WHERE book_id = ?
        """,
        (amount, book_id),
    )
    conn.commit()
    conn.close()