import json
import logging
from datetime import datetime
from ..database import get_sqlite, get_sqlite_sync

logger = logging.getLogger(__name__)


async def create_sync_run(run_id: str, json_files: int = 0):
    """Create a new sync run record."""
    db = await get_sqlite()
    try:
        await db.execute("""
            INSERT INTO sync_runs (run_id, started_at, status, json_files)
            VALUES (?, datetime('now'), 'running', ?)
        """, (run_id, json_files))
        await db.commit()
    finally:
        await db.close()


async def update_sync_run(run_id: str, status: str, total_orders: int = 0,
                          imported: int = 0, skipped: int = 0, errors: int = 0,
                          error_message: str = None):
    """Update sync run with results."""
    db = await get_sqlite()
    try:
        await db.execute("""
            UPDATE sync_runs SET
                finished_at = datetime('now'),
                status = ?,
                total_orders = ?,
                imported = ?,
                skipped = ?,
                errors = ?,
                error_message = ?
            WHERE run_id = ?
        """, (status, total_orders, imported, skipped, errors, error_message, run_id))
        await db.commit()
    finally:
        await db.close()


async def upsert_order(sync_run_id: str, order_number: str, order_date: str,
                       customer_name: str, status: str, id_comanda: int = None,
                       id_partener: int = None, error_message: str = None,
                       missing_skus: list = None, items_count: int = 0):
    """Upsert a single order — one row per order_number, status updated in place."""
    db = await get_sqlite()
    try:
        await db.execute("""
            INSERT INTO orders
                (order_number, order_date, customer_name, status,
                 id_comanda, id_partener, error_message, missing_skus, items_count,
                 last_sync_run_id)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
            ON CONFLICT(order_number) DO UPDATE SET
                status            = excluded.status,
                error_message     = excluded.error_message,
                missing_skus      = excluded.missing_skus,
                items_count       = excluded.items_count,
                id_comanda        = COALESCE(excluded.id_comanda, orders.id_comanda),
                id_partener       = COALESCE(excluded.id_partener, orders.id_partener),
                times_skipped     = CASE WHEN excluded.status = 'SKIPPED'
                                         THEN orders.times_skipped + 1
                                         ELSE orders.times_skipped END,
                last_sync_run_id  = excluded.last_sync_run_id,
                updated_at        = datetime('now')
        """, (order_number, order_date, customer_name, status,
              id_comanda, id_partener, error_message,
              json.dumps(missing_skus) if missing_skus else None,
              items_count, sync_run_id))
        await db.commit()
    finally:
        await db.close()


async def add_sync_run_order(sync_run_id: str, order_number: str, status_at_run: str):
    """Record that this run processed this order (junction table)."""
    db = await get_sqlite()
    try:
        await db.execute("""
            INSERT OR IGNORE INTO sync_run_orders (sync_run_id, order_number, status_at_run)
            VALUES (?, ?, ?)
        """, (sync_run_id, order_number, status_at_run))
        await db.commit()
    finally:
        await db.close()


async def track_missing_sku(sku: str, product_name: str = "",
                            order_count: int = 0, order_numbers: str = None,
                            customers: str = None):
    """Track a missing SKU with order context."""
    db = await get_sqlite()
    try:
        await db.execute("""
            INSERT OR IGNORE INTO missing_skus (sku, product_name)
            VALUES (?, ?)
        """, (sku, product_name))
        if order_count or order_numbers or customers:
            await db.execute("""
                UPDATE missing_skus SET
                    order_count = ?,
                    order_numbers = ?,
                    customers = ?
                WHERE sku = ?
            """, (order_count, order_numbers, customers, sku))
        await db.commit()
    finally:
        await db.close()


async def resolve_missing_sku(sku: str):
    """Mark a missing SKU as resolved."""
    db = await get_sqlite()
    try:
        await db.execute("""
            UPDATE missing_skus SET resolved = 1, resolved_at = datetime('now')
            WHERE sku = ?
        """, (sku,))
        await db.commit()
    finally:
        await db.close()


async def get_missing_skus_paginated(page: int = 1, per_page: int = 20, resolved: int = 0):
    """Get paginated missing SKUs. resolved=-1 means show all."""
    db = await get_sqlite()
    try:
        offset = (page - 1) * per_page

        if resolved == -1:
            cursor = await db.execute("SELECT COUNT(*) FROM missing_skus")
            total = (await cursor.fetchone())[0]
            cursor = await db.execute("""
                SELECT sku, product_name, first_seen, resolved, resolved_at,
                       order_count, order_numbers, customers
                FROM missing_skus
                ORDER BY resolved ASC, order_count DESC, first_seen DESC
                LIMIT ? OFFSET ?
            """, (per_page, offset))
        else:
            cursor = await db.execute(
                "SELECT COUNT(*) FROM missing_skus WHERE resolved = ?", (resolved,)
            )
            total = (await cursor.fetchone())[0]
            cursor = await db.execute("""
                SELECT sku, product_name, first_seen, resolved, resolved_at,
                       order_count, order_numbers, customers
                FROM missing_skus
                WHERE resolved = ?
                ORDER BY order_count DESC, first_seen DESC
                LIMIT ? OFFSET ?
            """, (resolved, per_page, offset))

        rows = await cursor.fetchall()

        return {
            "missing_skus": [dict(row) for row in rows],
            "total": total,
            "page": page,
            "per_page": per_page,
            "pages": (total + per_page - 1) // per_page if total > 0 else 0
        }
    finally:
        await db.close()


async def get_sync_runs(page: int = 1, per_page: int = 20):
    """Get paginated sync run history."""
    db = await get_sqlite()
    try:
        offset = (page - 1) * per_page

        cursor = await db.execute("SELECT COUNT(*) FROM sync_runs")
        total = (await cursor.fetchone())[0]

        cursor = await db.execute("""
            SELECT * FROM sync_runs
            ORDER BY started_at DESC
            LIMIT ? OFFSET ?
        """, (per_page, offset))
        rows = await cursor.fetchall()

        return {
            "runs": [dict(row) for row in rows],
            "total": total,
            "page": page,
            "pages": (total + per_page - 1) // per_page if total > 0 else 0
        }
    finally:
        await db.close()


async def get_sync_run_detail(run_id: str):
    """Get details for a specific sync run including its orders via sync_run_orders."""
    db = await get_sqlite()
    try:
        cursor = await db.execute(
            "SELECT * FROM sync_runs WHERE run_id = ?", (run_id,)
        )
        run = await cursor.fetchone()
        if not run:
            return None

        cursor = await db.execute("""
            SELECT o.* FROM orders o
            INNER JOIN sync_run_orders sro ON sro.order_number = o.order_number
            WHERE sro.sync_run_id = ?
            ORDER BY o.order_date
        """, (run_id,))
        orders = await cursor.fetchall()

        return {
            "run": dict(run),
            "orders": [dict(o) for o in orders]
        }
    finally:
        await db.close()


async def get_dashboard_stats():
    """Get stats for the dashboard."""
    db = await get_sqlite()
    try:
        cursor = await db.execute(
            "SELECT COUNT(*) FROM orders WHERE status = 'IMPORTED'"
        )
        imported = (await cursor.fetchone())[0]

        cursor = await db.execute(
            "SELECT COUNT(*) FROM orders WHERE status = 'SKIPPED'"
        )
        skipped = (await cursor.fetchone())[0]

        cursor = await db.execute(
            "SELECT COUNT(*) FROM orders WHERE status = 'ERROR'"
        )
        errors = (await cursor.fetchone())[0]

        cursor = await db.execute(
            "SELECT COUNT(*) FROM missing_skus WHERE resolved = 0"
        )
        missing = (await cursor.fetchone())[0]

        cursor = await db.execute("SELECT COUNT(DISTINCT sku) FROM missing_skus")
        total_missing_skus = (await cursor.fetchone())[0]

        cursor = await db.execute(
            "SELECT COUNT(DISTINCT sku) FROM missing_skus WHERE resolved = 0"
        )
        unresolved_skus = (await cursor.fetchone())[0]

        cursor = await db.execute("""
            SELECT * FROM sync_runs ORDER BY started_at DESC LIMIT 1
        """)
        last_run = await cursor.fetchone()

        return {
            "imported": imported,
            "skipped": skipped,
            "errors": errors,
            "missing_skus": missing,
            "total_tracked_skus": total_missing_skus,
            "unresolved_skus": unresolved_skus,
            "last_run": dict(last_run) if last_run else None
        }
    finally:
        await db.close()


async def get_scheduler_config():
    """Get scheduler configuration from SQLite."""
    db = await get_sqlite()
    try:
        cursor = await db.execute("SELECT key, value FROM scheduler_config")
        rows = await cursor.fetchall()
        return {row["key"]: row["value"] for row in rows}
    finally:
        await db.close()


async def set_scheduler_config(key: str, value: str):
    """Set a scheduler configuration value."""
    db = await get_sqlite()
    try:
        await db.execute("""
            INSERT OR REPLACE INTO scheduler_config (key, value)
            VALUES (?, ?)
        """, (key, value))
        await db.commit()
    finally:
        await db.close()


# ── web_products ─────────────────────────────────

async def upsert_web_product(sku: str, product_name: str):
    """Insert or update a web product, incrementing order_count."""
    db = await get_sqlite()
    try:
        await db.execute("""
            INSERT INTO web_products (sku, product_name, order_count)
            VALUES (?, ?, 1)
            ON CONFLICT(sku) DO UPDATE SET
                product_name = COALESCE(NULLIF(excluded.product_name, ''), web_products.product_name),
                last_seen = datetime('now'),
                order_count = web_products.order_count + 1
        """, (sku, product_name))
        await db.commit()
    finally:
        await db.close()


async def get_web_product_name(sku: str) -> str:
    """Lookup product name by SKU."""
    db = await get_sqlite()
    try:
        cursor = await db.execute(
            "SELECT product_name FROM web_products WHERE sku = ?", (sku,)
        )
        row = await cursor.fetchone()
        return row["product_name"] if row else ""
    finally:
        await db.close()


async def get_web_products_batch(skus: list) -> dict:
    """Batch lookup product names by SKU list. Returns {sku: product_name}."""
    if not skus:
        return {}
    db = await get_sqlite()
    try:
        placeholders = ",".join("?" for _ in skus)
        cursor = await db.execute(
            f"SELECT sku, product_name FROM web_products WHERE sku IN ({placeholders})",
            list(skus)
        )
        rows = await cursor.fetchall()
        return {row["sku"]: row["product_name"] for row in rows}
    finally:
        await db.close()


# ── order_items ──────────────────────────────────

async def add_order_items(order_number: str, items: list):
    """Bulk insert order items. Uses INSERT OR IGNORE — PK is (order_number, sku)."""
    if not items:
        return
    db = await get_sqlite()
    try:
        await db.executemany("""
            INSERT OR IGNORE INTO order_items
                (order_number, sku, product_name, quantity, price, vat,
                 mapping_status, codmat, id_articol, cantitate_roa)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        """, [
            (order_number,
             item.get("sku"), item.get("product_name"),
             item.get("quantity"), item.get("price"), item.get("vat"),
             item.get("mapping_status"), item.get("codmat"),
             item.get("id_articol"), item.get("cantitate_roa"))
            for item in items
        ])
        await db.commit()
    finally:
        await db.close()


async def get_order_items(order_number: str) -> list:
    """Fetch items for one order."""
    db = await get_sqlite()
    try:
        cursor = await db.execute("""
            SELECT * FROM order_items
            WHERE order_number = ?
            ORDER BY sku
        """, (order_number,))
        rows = await cursor.fetchall()
        return [dict(row) for row in rows]
    finally:
        await db.close()


async def get_order_detail(order_number: str) -> dict:
    """Get full order detail: order metadata + items."""
    db = await get_sqlite()
    try:
        cursor = await db.execute("""
            SELECT * FROM orders WHERE order_number = ?
        """, (order_number,))
        order = await cursor.fetchone()
        if not order:
            return None

        cursor = await db.execute("""
            SELECT * FROM order_items WHERE order_number = ?
            ORDER BY sku
        """, (order_number,))
        items = await cursor.fetchall()

        return {
            "order": dict(order),
            "items": [dict(i) for i in items]
        }
    finally:
        await db.close()


async def get_run_orders_filtered(run_id: str, status_filter: str = "all",
                                   page: int = 1, per_page: int = 50,
                                   sort_by: str = "order_date", sort_dir: str = "asc"):
    """Get paginated orders for a run via sync_run_orders junction table."""
    db = await get_sqlite()
    try:
        where = "WHERE sro.sync_run_id = ?"
        params = [run_id]

        if status_filter and status_filter != "all":
            where += " AND UPPER(o.status) = ?"
            params.append(status_filter.upper())

        allowed_sort = {"order_date", "order_number", "customer_name", "items_count",
                        "status", "first_seen_at", "updated_at"}
        if sort_by not in allowed_sort:
            sort_by = "order_date"
        if sort_dir.lower() not in ("asc", "desc"):
            sort_dir = "asc"

        cursor = await db.execute(
            f"SELECT COUNT(*) FROM orders o INNER JOIN sync_run_orders sro "
            f"ON sro.order_number = o.order_number {where}", params
        )
        total = (await cursor.fetchone())[0]

        offset = (page - 1) * per_page
        cursor = await db.execute(f"""
            SELECT o.* FROM orders o
            INNER JOIN sync_run_orders sro ON sro.order_number = o.order_number
            {where}
            ORDER BY o.{sort_by} {sort_dir}
            LIMIT ? OFFSET ?
        """, params + [per_page, offset])
        rows = await cursor.fetchall()

        cursor = await db.execute("""
            SELECT o.status, COUNT(*) as cnt
            FROM orders o
            INNER JOIN sync_run_orders sro ON sro.order_number = o.order_number
            WHERE sro.sync_run_id = ?
            GROUP BY o.status
        """, (run_id,))
        status_counts = {row["status"]: row["cnt"] for row in await cursor.fetchall()}

        return {
            "orders": [dict(r) for r in rows],
            "total": total,
            "page": page,
            "per_page": per_page,
            "pages": (total + per_page - 1) // per_page if total > 0 else 0,
            "counts": {
                "imported": status_counts.get("IMPORTED", 0),
                "skipped": status_counts.get("SKIPPED", 0),
                "error": status_counts.get("ERROR", 0),
                "total": sum(status_counts.values())
            }
        }
    finally:
        await db.close()


async def get_orders(page: int = 1, per_page: int = 50,
                     search: str = "", status_filter: str = "all",
                     sort_by: str = "order_date", sort_dir: str = "desc",
                     period_days: int = 7):
    """Get orders with filters, sorting, and period. period_days=0 means all time."""
    db = await get_sqlite()
    try:
        where_clauses = []
        params = []

        if period_days and period_days > 0:
            where_clauses.append("order_date >= date('now', ?)")
            params.append(f"-{period_days} days")

        if search:
            where_clauses.append("(order_number LIKE ? OR customer_name LIKE ?)")
            params.extend([f"%{search}%", f"%{search}%"])

        if status_filter and status_filter not in ("all", "UNINVOICED"):
            where_clauses.append("UPPER(status) = ?")
            params.append(status_filter.upper())

        where = ("WHERE " + " AND ".join(where_clauses)) if where_clauses else ""

        allowed_sort = {"order_date", "order_number", "customer_name", "items_count",
                        "status", "first_seen_at", "updated_at"}
        if sort_by not in allowed_sort:
            sort_by = "order_date"
        if sort_dir.lower() not in ("asc", "desc"):
            sort_dir = "desc"

        cursor = await db.execute(f"SELECT COUNT(*) FROM orders {where}", params)
        total = (await cursor.fetchone())[0]

        offset = (page - 1) * per_page
        cursor = await db.execute(f"""
            SELECT * FROM orders
            {where}
            ORDER BY {sort_by} {sort_dir}
            LIMIT ? OFFSET ?
        """, params + [per_page, offset])
        rows = await cursor.fetchall()

        # Counts by status (on full period, not just this page)
        cursor = await db.execute(f"""
            SELECT status, COUNT(*) as cnt FROM orders
            {where}
            GROUP BY status
        """, params)
        status_counts = {row["status"]: row["cnt"] for row in await cursor.fetchall()}

        return {
            "orders": [dict(r) for r in rows],
            "total": total,
            "page": page,
            "per_page": per_page,
            "pages": (total + per_page - 1) // per_page if total > 0 else 0,
            "counts": {
                "imported": status_counts.get("IMPORTED", 0),
                "skipped": status_counts.get("SKIPPED", 0),
                "error": status_counts.get("ERROR", 0),
                "total": sum(status_counts.values())
            }
        }
    finally:
        await db.close()


async def update_import_order_addresses(order_number: str,
                                         id_adresa_facturare: int = None,
                                         id_adresa_livrare: int = None):
    """Update ROA address IDs on an order record."""
    db = await get_sqlite()
    try:
        await db.execute("""
            UPDATE orders SET
                id_adresa_facturare = ?,
                id_adresa_livrare = ?,
                updated_at = datetime('now')
            WHERE order_number = ?
        """, (id_adresa_facturare, id_adresa_livrare, order_number))
        await db.commit()
    finally:
        await db.close()