from __future__ import annotations

import sqlite3
from contextlib import contextmanager
from pathlib import Path
from typing import Any, Iterator


def utc_now() -> str:
    from datetime import datetime, timezone

    return datetime.now(timezone.utc).replace(microsecond=0).isoformat()


def dict_factory(cursor: sqlite3.Cursor, row: sqlite3.Row) -> dict[str, Any]:
    return {col[0]: row[idx] for idx, col in enumerate(cursor.description)}


class Database:
    def __init__(self, path: str) -> None:
        self.path = Path(path)
        self.path.parent.mkdir(parents=True, exist_ok=True)

    def connect(self) -> sqlite3.Connection:
        conn = sqlite3.connect(self.path)
        conn.row_factory = dict_factory
        conn.execute("PRAGMA foreign_keys = ON")
        return conn

    @contextmanager
    def session(self) -> Iterator[sqlite3.Connection]:
        conn = self.connect()
        try:
            yield conn
            conn.commit()
        finally:
            conn.close()

    def fetch_one(self, sql: str, params: tuple[Any, ...] = ()) -> dict[str, Any] | None:
        with self.session() as conn:
            return conn.execute(sql, params).fetchone()

    def fetch_all(self, sql: str, params: tuple[Any, ...] = ()) -> list[dict[str, Any]]:
        with self.session() as conn:
            return list(conn.execute(sql, params).fetchall())

    def execute(self, sql: str, params: tuple[Any, ...] = ()) -> None:
        with self.session() as conn:
            conn.execute(sql, params)

    def init_schema(self) -> None:
        schema = """
        CREATE TABLE IF NOT EXISTS accounts (
            id TEXT PRIMARY KEY,
            username TEXT NOT NULL UNIQUE,
            password_hash TEXT NOT NULL,
            password_salt TEXT NOT NULL,
            display_name TEXT NOT NULL,
            role TEXT NOT NULL,
            approval_status TEXT NOT NULL,
            approved_by TEXT,
            approved_at TEXT,
            preferred_analysis_model_id TEXT,
            created_at TEXT NOT NULL,
            updated_at TEXT NOT NULL
        );

        CREATE TABLE IF NOT EXISTS auth_tokens (
            token TEXT PRIMARY KEY,
            account_id TEXT NOT NULL,
            created_at TEXT NOT NULL,
            FOREIGN KEY(account_id) REFERENCES accounts(id) ON DELETE CASCADE
        );

        CREATE TABLE IF NOT EXISTS model_profiles (
            id TEXT PRIMARY KEY,
            owner_account_id TEXT,
            name TEXT NOT NULL,
            provider TEXT NOT NULL,
            base_url TEXT NOT NULL,
            api_key TEXT NOT NULL DEFAULT '',
            model_name TEXT NOT NULL,
            is_system INTEGER NOT NULL DEFAULT 0,
            is_default INTEGER NOT NULL DEFAULT 0,
            created_at TEXT NOT NULL,
            updated_at TEXT NOT NULL,
            FOREIGN KEY(owner_account_id) REFERENCES accounts(id) ON DELETE CASCADE
        );

        CREATE TABLE IF NOT EXISTS knowledge_bases (
            id TEXT PRIMARY KEY,
            user_id TEXT NOT NULL,
            name TEXT NOT NULL,
            description TEXT NOT NULL DEFAULT '',
            fastgpt_dataset_id TEXT,
            sync_status TEXT NOT NULL DEFAULT 'pending',
            created_at TEXT NOT NULL,
            updated_at TEXT NOT NULL,
            FOREIGN KEY(user_id) REFERENCES accounts(id) ON DELETE CASCADE
        );

        CREATE TABLE IF NOT EXISTS knowledge_documents (
            id TEXT PRIMARY KEY,
            knowledge_base_id TEXT NOT NULL,
            title TEXT NOT NULL,
            source_type TEXT NOT NULL,
            source_url TEXT NOT NULL DEFAULT '',
            transcript_text TEXT NOT NULL DEFAULT '',
            style_summary TEXT NOT NULL DEFAULT '',
            combined_text TEXT NOT NULL DEFAULT '',
            fastgpt_collection_id TEXT NOT NULL DEFAULT '',
            analysis_model_profile_id TEXT NOT NULL DEFAULT '',
            created_at TEXT NOT NULL,
            updated_at TEXT NOT NULL,
            FOREIGN KEY(knowledge_base_id) REFERENCES knowledge_bases(id) ON DELETE CASCADE
        );

        CREATE TABLE IF NOT EXISTS assistants (
            id TEXT PRIMARY KEY,
            user_id TEXT NOT NULL,
            name TEXT NOT NULL,
            description TEXT NOT NULL DEFAULT '',
            system_prompt TEXT NOT NULL DEFAULT '',
            generation_goal TEXT NOT NULL DEFAULT '',
            fastgpt_app_key TEXT NOT NULL DEFAULT '',
            model_profile_id TEXT NOT NULL DEFAULT '',
            created_at TEXT NOT NULL,
            updated_at TEXT NOT NULL,
            FOREIGN KEY(user_id) REFERENCES accounts(id) ON DELETE CASCADE
        );

        CREATE TABLE IF NOT EXISTS assistant_knowledge_bases (
            assistant_id TEXT NOT NULL,
            knowledge_base_id TEXT NOT NULL,
            PRIMARY KEY (assistant_id, knowledge_base_id),
            FOREIGN KEY(assistant_id) REFERENCES assistants(id) ON DELETE CASCADE,
            FOREIGN KEY(knowledge_base_id) REFERENCES knowledge_bases(id) ON DELETE CASCADE
        );

        CREATE TABLE IF NOT EXISTS jobs (
            id TEXT PRIMARY KEY,
            user_id TEXT NOT NULL,
            assistant_id TEXT,
            knowledge_base_id TEXT NOT NULL,
            source_type TEXT NOT NULL,
            source_url TEXT,
            title TEXT NOT NULL,
            language TEXT NOT NULL DEFAULT 'auto',
            status TEXT NOT NULL,
            transcript_text TEXT NOT NULL DEFAULT '',
            style_summary TEXT NOT NULL DEFAULT '',
            fastgpt_collection_id TEXT NOT NULL DEFAULT '',
            upload_status TEXT NOT NULL DEFAULT 'pending',
            error TEXT NOT NULL DEFAULT '',
            artifacts_json TEXT NOT NULL DEFAULT '{}',
            analysis_model_profile_id TEXT NOT NULL DEFAULT '',
            created_at TEXT NOT NULL,
            updated_at TEXT NOT NULL,
            FOREIGN KEY(user_id) REFERENCES accounts(id) ON DELETE CASCADE,
            FOREIGN KEY(assistant_id) REFERENCES assistants(id) ON DELETE SET NULL,
            FOREIGN KEY(knowledge_base_id) REFERENCES knowledge_bases(id) ON DELETE CASCADE
        );

        CREATE TABLE IF NOT EXISTS app_updates (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            platform TEXT NOT NULL,
            channel TEXT NOT NULL,
            version_code INTEGER NOT NULL,
            version_name TEXT NOT NULL,
            min_supported_code INTEGER NOT NULL,
            apk_url TEXT NOT NULL,
            apk_sha256 TEXT NOT NULL DEFAULT '',
            notes TEXT NOT NULL DEFAULT '',
            force_update INTEGER NOT NULL DEFAULT 0,
            is_active INTEGER NOT NULL DEFAULT 1,
            published_at INTEGER NOT NULL,
            created_by TEXT NOT NULL
        );
        """
        with self.session() as conn:
            conn.executescript(schema)