import aiosqlite
from database.db import DB_PATH


async def get_or_create_session(session_id: str, persona_id: str = "default") -> dict:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            "SELECT * FROM sessions WHERE session_id = ?", (session_id,)
        ) as cursor:
            row = await cursor.fetchone()

        if row:
            return dict(row)

        await db.execute(
            "INSERT INTO sessions (session_id, persona_id) VALUES (?, ?)",
            (session_id, persona_id),
        )
        await db.commit()

        async with db.execute(
            "SELECT * FROM sessions WHERE session_id = ?", (session_id,)
        ) as cursor:
            row = await cursor.fetchone()
        return dict(row)


async def get_all_sessions() -> list:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            "SELECT * FROM sessions ORDER BY updated_at DESC"
        ) as cursor:
            rows = await cursor.fetchall()
    return [dict(r) for r in rows]


async def get_session(session_id: str) -> dict | None:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            "SELECT * FROM sessions WHERE session_id = ?",
            (session_id,),
        ) as cursor:
            row = await cursor.fetchone()
    return dict(row) if row else None


async def update_session_title(session_id: str, title: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET title = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (title, session_id),
        )
        await db.commit()


async def update_session_persona(session_id: str, persona_id: str):
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            "SELECT persona_id FROM sessions WHERE session_id = ?",
            (session_id,),
        ) as cur:
            row = await cur.fetchone()
        prev = row["persona_id"] if row else None

        await db.execute(
            "UPDATE sessions SET persona_id = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (persona_id, session_id),
        )

        # If persona changed, reset RPG state bound to the persona/arc.
        if prev is not None and prev != persona_id:
            await db.execute(
                """UPDATE sessions
                   SET facts_json = '[]',
                       global_plot = '',
                       status_quo = '',
                       plot_arc_json = '{}'
                   WHERE session_id = ?""",
                (session_id,),
            )
            await db.execute(
                "DELETE FROM action_resolutions WHERE session_id = ?",
                (session_id,),
            )
        await db.commit()


async def update_session_rpg(session_id: str, rpg_enabled: bool):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET rpg_enabled = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (1 if rpg_enabled else 0, session_id),
        )
        await db.commit()


async def update_session_facts(session_id: str, facts_json: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET facts_json = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (facts_json, session_id),
        )
        await db.commit()


async def update_session_global_plot(session_id: str, global_plot: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET global_plot = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (global_plot, session_id),
        )
        await db.commit()


async def update_session_status_quo(session_id: str, status_quo: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET status_quo = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (status_quo, session_id),
        )
        await db.commit()


async def update_session_plot_arc(session_id: str, plot_arc_json: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET plot_arc_json = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (plot_arc_json, session_id),
        )
        await db.commit()


async def add_action_resolution(
    session_id: str,
    intent_text: str,
    roll: int,
    outcome: str,
    resolution_text: str,
    message_id: int | None = None,
):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            """INSERT INTO action_resolutions
               (session_id, message_id, intent_text, roll, outcome, resolution_text)
               VALUES (?, ?, ?, ?, ?, ?)""",
            (session_id, message_id, intent_text, roll, outcome, resolution_text),
        )
        await db.commit()


async def get_last_action_resolution(session_id: str) -> dict | None:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            """SELECT * FROM action_resolutions
               WHERE session_id = ?
               ORDER BY id DESC LIMIT 1""",
            (session_id,),
        ) as cur:
            row = await cur.fetchone()
    return dict(row) if row else None


async def delete_session(session_id: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute("DELETE FROM messages WHERE session_id = ?", (session_id,))
        await db.execute("DELETE FROM rpg_quests WHERE session_id = ?", (session_id,))
        await db.execute("DELETE FROM action_resolutions WHERE session_id = ?", (session_id,))
        await db.execute("DELETE FROM sessions WHERE session_id = ?", (session_id,))
        await db.commit()


async def get_history(session_id: str) -> list:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            """SELECT id, role, content, image_prompt, image_path
               FROM messages WHERE session_id = ? ORDER BY id""",
            (session_id,),
        ) as cursor:
            rows = await cursor.fetchall()
    return [
        {
            "id": r["id"],
            "role": r["role"],
            "content": r["content"],
            "image_prompt": r["image_prompt"],
            "image_path": r["image_path"],
        }
        for r in rows
    ]


async def get_message(message_id: int) -> dict | None:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            "SELECT id, session_id, role, content FROM messages WHERE id = ?",
            (message_id,),
        ) as cursor:
            row = await cursor.fetchone()
    return dict(row) if row else None


async def update_message_content(message_id: int, content: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE messages SET content = ? WHERE id = ?",
            (content, message_id),
        )
        await db.commit()


async def delete_messages_after(session_id: str, message_id: int):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "DELETE FROM messages WHERE session_id = ? AND id > ?",
            (session_id, message_id),
        )
        await db.commit()


async def delete_message(message_id: int):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute("DELETE FROM messages WHERE id = ?", (message_id,))
        await db.commit()


async def get_last_message_preview(session_id: str, max_len: int = 80) -> str:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            """SELECT content, role FROM messages
               WHERE session_id = ? AND role IN ('user', 'assistant')
               ORDER BY id DESC LIMIT 1""",
            (session_id,),
        ) as cursor:
            row = await cursor.fetchone()
    if not row:
        return ""
    prefix = "Вы: " if row["role"] == "user" else "AI: "
    text = (row["content"] or "").replace("\n", " ").strip()
    if len(text) > max_len:
        text = text[:max_len] + "…"
    return prefix + text


async def fork_session(source_session_id: str, until_message_id: int) -> str | None:
    source = await get_session(source_session_id)
    if not source:
        return None

    import uuid
    new_id = "sess_" + uuid.uuid4().hex[:8]

    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            """INSERT INTO sessions
               (session_id, persona_id, title, rpg_enabled, facts_json, global_plot,
                status_quo, plot_arc_json, genre, rpg_settings_json, affinity)
               VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
            (
                new_id,
                source["persona_id"],
                (source.get("title") or "Новый чат") + " (ветка)",
                source.get("rpg_enabled", 0),
                source.get("facts_json", "[]"),
                source.get("global_plot", ""),
                source.get("status_quo", ""),
                source.get("plot_arc_json", "{}"),
                source.get("genre", "adventure"),
                source.get("rpg_settings_json", "{}"),
                source.get("affinity", 0),
            ),
        )
        async with db.execute(
            """SELECT role, content, image_prompt, image_path FROM messages
               WHERE session_id = ? AND id <= ? ORDER BY id""",
            (source_session_id, until_message_id),
        ) as cur:
            rows = await cur.fetchall()
        for r in rows:
            await db.execute(
                """INSERT INTO messages (session_id, role, content, image_prompt, image_path)
                   VALUES (?, ?, ?, ?, ?)""",
                (new_id, r[0], r[1], r[2], r[3]),
            )
        async with db.execute(
            "SELECT title, status FROM rpg_quests WHERE session_id = ?",
            (source_session_id,),
        ) as cur:
            quests = await cur.fetchall()
        for q in quests:
            await db.execute(
                "INSERT INTO rpg_quests (session_id, title, status) VALUES (?, ?, ?)",
                (new_id, q[0], q[1]),
            )
        await db.commit()
    return new_id


async def add_message(
    session_id: str,
    role: str,
    content: str,
    image_prompt: str | None = None,
    image_path: str | None = None,
):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            """INSERT INTO messages (session_id, role, content, image_prompt, image_path)
               VALUES (?, ?, ?, ?, ?)""",
            (session_id, role, content, image_prompt, image_path),
        )
        await db.execute(
            "UPDATE sessions SET updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (session_id,),
        )
        await db.commit()


async def update_message_image(message_id: int, image_path: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE messages SET image_path = ? WHERE id = ?",
            (image_path, message_id),
        )
        await db.commit()


async def get_last_assistant_message_id(session_id: str) -> int | None:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            """SELECT id FROM messages
               WHERE session_id = ? AND role = 'assistant'
               ORDER BY id DESC LIMIT 1""",
            (session_id,),
        ) as cursor:
            row = await cursor.fetchone()
    return row["id"] if row else None


async def clear_history(session_id: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "DELETE FROM messages WHERE session_id = ?", (session_id,)
        )
        await db.commit()


async def update_session_affinity(session_id: str, delta: int):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET affinity = affinity + ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (delta, session_id),
        )
        await db.commit()


async def update_session_genre(session_id: str, genre: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET genre = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (genre, session_id),
        )
        await db.commit()


async def update_session_rpg_settings(session_id: str, settings_json: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET rpg_settings_json = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (settings_json, session_id),
        )
        await db.commit()


async def update_session_outfit(session_id: str, outfit_json: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE sessions SET outfit_json = ?, updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
            (outfit_json, session_id),
        )
        await db.commit()


async def upsert_quest(session_id: str, title: str, status: str = "active"):
    async with aiosqlite.connect(DB_PATH) as db:
        async with db.execute(
            "SELECT id FROM rpg_quests WHERE session_id = ? AND title = ?",
            (session_id, title),
        ) as cur:
            row = await cur.fetchone()
        if row:
            await db.execute(
                "UPDATE rpg_quests SET status = ? WHERE id = ?",
                (status, row[0]),
            )
        else:
            await db.execute(
                "INSERT INTO rpg_quests (session_id, title, status) VALUES (?, ?, ?)",
                (session_id, title, status),
            )
        await db.commit()


async def get_quests(session_id: str) -> list:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            "SELECT id, title, status FROM rpg_quests WHERE session_id = ? ORDER BY id",
            (session_id,),
        ) as cur:
            rows = await cur.fetchall()
    return [dict(r) for r in rows]


async def update_quest_status(session_id: str, title: str, status: str):
    async with aiosqlite.connect(DB_PATH) as db:
        await db.execute(
            "UPDATE rpg_quests SET status = ? WHERE session_id = ? AND title = ?",
            (status, session_id, title),
        )
        await db.commit()


async def get_message_count(session_id: str) -> int:
    async with aiosqlite.connect(DB_PATH) as db:
        db.row_factory = aiosqlite.Row
        async with db.execute(
            "SELECT COUNT(*) as cnt FROM messages WHERE session_id = ? AND role != 'system'",
            (session_id,),
        ) as cursor:
            row = await cursor.fetchone()
    return row["cnt"]