from datetime import date, datetime
from typing import Iterable

from database.connection import connect


class PredictionRepository:

    def __init__(self, database_url: str):
        self.database_url = database_url

    def connection(self):
        return connect(self.database_url)

    # ─────────────────────────────────────────────
    # Predictions
    # ─────────────────────────────────────────────

    def insert_predictions(
        self,
        predictions: Iterable[dict],
    ) -> int:

        sql = """
            INSERT INTO predictions (
                model_version,
                feature_version,
                prediction_date,
                prediction_timestamp,
                symbol,
                predicted_probability,
                rank,
                target_threshold,
                target_horizon_days,
                prediction_close
            )
            VALUES (
                :model_version,
                :feature_version,
                :prediction_date,
                :prediction_timestamp,
                :symbol,
                :predicted_probability,
                :rank,
                :target_threshold,
                :target_horizon_days,
                :prediction_close
            )
            ON CONFLICT (
                prediction_date,
                symbol,
                model_version
            )
            DO NOTHING
        """

        rows = list(predictions)

        if not rows:
            return 0

        with self.connection() as conn:
            with conn.cursor() as cur:
                inserted = 0
                for row in rows:
                    cur.execute(sql.replace("DO NOTHING", "DO NOTHING RETURNING id"), row)
                    if cur.fetchone() is not None:
                        inserted += 1

        return inserted

    # ─────────────────────────────────────────────
    # Unresolved predictions
    # ─────────────────────────────────────────────

    def get_unresolved_predictions(self):

        sql = """
            SELECT *
            FROM predictions
            WHERE resolved_at IS NULL
            ORDER BY prediction_date, symbol
        """

        with self.connection() as conn:
            with conn.cursor() as cur:
                cur.execute(sql)
                return cur.fetchall()

    # ─────────────────────────────────────────────
    # Resolve prediction
    # ─────────────────────────────────────────────

    def resolve_prediction(
        self,
        prediction_id: int,
        entry_date: date,
        entry_price: float,
        evaluation_end_date: date,
        max_future_close: float,
        actual_return: float,
        actual_label: int,
    ):

        sql = """
            UPDATE predictions
            SET
                entry_date = :entry_date,
                entry_open = :entry_open,
                evaluation_end_date = :evaluation_end_date,
                max_close_5d = :max_close_5d,
                actual_return = :actual_return,
                actual_label = :actual_label,
                resolved_at = STRFTIME('%Y-%m-%dT%H:%M:%fZ', 'now')
            WHERE id = :prediction_id
        """

        params = {
            "prediction_id": prediction_id,
            "entry_date": entry_date,
            "entry_open": entry_price,
            "evaluation_end_date": evaluation_end_date,
            "max_close_5d": max_future_close,
            "actual_return": actual_return,
            "actual_label": actual_label,
        }

        with self.connection() as conn:
            with conn.cursor() as cur:
                cur.execute(sql, params)

    # ─────────────────────────────────────────────
    # Recent resolved predictions
    # ─────────────────────────────────────────────

    def get_recent_resolved(
        self,
        days: int = 20,
    ):

        sql = """
            SELECT *
            FROM predictions
            WHERE
                resolved_at IS NOT NULL
                AND prediction_date >= date('now', ?)
            ORDER BY prediction_date DESC
        """

        with self.connection() as conn:
            with conn.cursor() as cur:
                cur.execute(sql, (f"-{days} days",))
                return cur.fetchall()