"""
A simplified API for interacting with the EVE Online ESI API.
"""

import datetime
import json
import logging
import os
from dataclasses import asdict, dataclass, field
import queue
import threading
import time
import asyncio
import aiohttp
from pathlib import Path
from typing import Any

import requests

from .refresh_token import get_access_token_from_refresh_token

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Constants
ESI_BASE_URL = "https://esi.evetech.net/latest"
DATASOURCE = "tranquility"
USER_AGENT_HEADER = {'User-Agent': 'Haul (Hyperspace Asset Unloading and Loading)'}
CACHE_DIR = Path(__file__).resolve().parent.parent / 'cache'
AUTH_FILE = CACHE_DIR / 'auth.json'
ERROR_LIMIT_THRESHOLD = 50  # ESI Error limit threshold
REQUEST_RATE_LIMIT = 0.05  # Time in seconds between requests to avoid rate limiting


@dataclass
class WaypointSubmissionResult:
    requested_count: int
    success_count: int = 0
    applied_waypoints: list[int] = field(default_factory=list)
    failed_waypoints: list[int] = field(default_factory=list)
    errors: list[str] = field(default_factory=list)

    def to_dict(self) -> dict[str, Any]:
        data = asdict(self)
        data["success"] = self.requested_count > 0 and self.success_count == self.requested_count
        return data


@dataclass(frozen=True)
class WalletTransaction:
    transaction_id: int
    date: datetime.datetime
    location_id: int
    type_id: int
    unit_price: float
    quantity: int
    client_id: int
    is_buy: bool
    is_personal: bool
    journal_ref_id: int


async def get_location() -> int:
    """
    Gets the current location of the character.

    Returns:
        The location ID of the character (station ID or solar system ID).
    """
    character_id = os.getenv('character_id')
    if not character_id:
        logger.error("Character ID not found in environment variables.")
        raise EnvironmentError("Character ID not set in environment variables.")

    url = f"{ESI_BASE_URL}/characters/{character_id}/location/"

    headers = {
        "Accept": "application/json",
        "Cache-Control": "no-cache",
        "Authorization": f"Bearer {access_token()}",
        **USER_AGENT_HEADER,
    }

    params = {
        "datasource": DATASOURCE,
    }

    async with aiohttp.ClientSession() as session:
        async with session.get(url, params=params, headers=headers) as response:
            logger.debug(f"Request URL: {response.url}")
            logger.debug(f"Response Status Code: {response.status}")

            if response.status == 401:
                logger.info("Access token expired, refreshing token.")
                # Using run_in_executor for synchronous access_token
                loop = asyncio.get_running_loop()
                await loop.run_in_executor(None, access_token, True)
                headers["Authorization"] = f"Bearer {access_token()}"
                async with session.get(url, params=params, headers=headers) as retry_response:
                    response = retry_response

            if int(response.headers.get("X-Esi-Error-Limit-Remain", 100)) < ERROR_LIMIT_THRESHOLD:
                logger.warning("Approaching ESI Error Limit.")
                raise Exception("ESI Error Limit approaching threshold.")

            response.raise_for_status()
            data = await response.json()

            location_id = data.get("station_id") or data.get("solar_system_id")
            if not location_id:
                logger.error("Location ID not found in response.")
                raise ValueError("Unable to determine character's location.")

            logger.info(f"Character location ID: {location_id}")
            return location_id


async def set_waypoints(waypoints: list[int]) -> dict[str, Any]:
    """
    Sets the waypoints for the character's autopilot.

    Args:
        waypoints: A list of waypoint IDs to set.
    """
    result = WaypointSubmissionResult(requested_count=len(waypoints))

    if not waypoints:
        logger.warning("No waypoints provided.")
        return result.to_dict()

    url = f"{ESI_BASE_URL}/ui/autopilot/waypoint/"

    headers = {
        "Accept": "application/json",
        "Cache-Control": "no-cache",
        "Authorization": f"Bearer {access_token()}",
        **USER_AGENT_HEADER,
    }

    async with aiohttp.ClientSession() as session:
        for index, waypoint in enumerate(waypoints):
            params = {
                "add_to_beginning": "false",
                "clear_other_waypoints": "true" if index == 0 else "false",
                "destination_id": waypoint,
                "datasource": DATASOURCE,
            }
            waypoint_headers = dict(headers)
            waypoint_error = None

            for attempt in range(2):
                try:
                    async with session.post(url, params=params, headers=waypoint_headers) as response:
                        if response.status == 401 and attempt == 0:
                            logger.info("Access token expired while setting waypoint %s, refreshing token.", waypoint)
                            loop = asyncio.get_running_loop()
                            refreshed_token = await loop.run_in_executor(None, access_token, True)
                            waypoint_headers["Authorization"] = f"Bearer {refreshed_token}"
                            continue

                        if response.status == 401:
                            waypoint_error = f"Waypoint {waypoint} unauthorized after token refresh"
                            logger.error(waypoint_error)
                            break

                        response.raise_for_status()
                        logger.info(f"Waypoint {waypoint} set successfully.")
                        result.success_count += 1
                        result.applied_waypoints.append(waypoint)
                        await asyncio.sleep(1)  # Rate limiting
                        waypoint_error = None
                        break
                except (aiohttp.ClientError, TypeError, ValueError) as error:
                    waypoint_error = f"Failed to set waypoint {waypoint}: {error}"
                    logger.error(waypoint_error)
                    break
                except Exception as error:
                    waypoint_error = f"Unexpected error while setting waypoint {waypoint}: {error}"
                    logger.exception(waypoint_error)
                    break
            else:
                waypoint_error = f"Failed to set waypoint {waypoint}: retries exhausted"

            if waypoint_error is not None:
                result.failed_waypoints.append(waypoint)
                result.errors.append(waypoint_error)

    return result.to_dict()


async def open_market_window(type_id: int) -> None:
    """
    Opens the market window for a specific item type in the game client.

    Args:
        type_id: The type ID of the item.
    """
    url = f"{ESI_BASE_URL}/ui/openwindow/marketdetails/"

    headers = {
        "Accept": "application/json",
        "Cache-Control": "no-cache",
        "Authorization": f"Bearer {access_token()}",
        **USER_AGENT_HEADER,
    }

    params = {
        "type_id": type_id,
        "datasource": DATASOURCE,
    }

    async with aiohttp.ClientSession() as session:
        try:
            async with session.post(url, params=params, headers=headers) as response:
                response.raise_for_status()
                logger.info(f"Market window opened for type ID {type_id}.")
        except aiohttp.ClientError as e:
            logger.error(f"Failed to open market window for type ID {type_id}: {e}")


async def get_wallet_transactions(from_id: int | None = None) -> list[WalletTransaction]:
    """
    Retrieves recent wallet transactions for the configured character.

    Args:
        from_id: Optional transaction ID cursor.

    Returns:
        A list of normalized wallet transactions.
    """
    character_id = os.getenv('character_id')
    if not character_id:
        logger.error("Character ID not found in environment variables.")
        raise EnvironmentError("Character ID not set in environment variables.")

    url = f"{ESI_BASE_URL}/characters/{character_id}/wallet/transactions/"
    headers = {
        "Accept": "application/json",
        "Cache-Control": "no-cache",
        "Authorization": f"Bearer {access_token()}",
        **USER_AGENT_HEADER,
    }
    params = {
        "datasource": DATASOURCE,
    }
    if from_id is not None:
        params["from_id"] = from_id

    async with aiohttp.ClientSession() as session:
        for attempt in range(2):
            async with session.get(url, params=params, headers=headers) as response:
                if response.status == 401 and attempt == 0:
                    logger.info("Access token expired while loading wallet transactions, refreshing token.")
                    loop = asyncio.get_running_loop()
                    refreshed_token = await loop.run_in_executor(None, access_token, True)
                    headers["Authorization"] = f"Bearer {refreshed_token}"
                    continue

                if response.status == 403:
                    error_body = await response.text()
                    logger.error("Wallet transaction access denied: %s", error_body)
                    raise PermissionError(
                        "Wallet transaction access denied. Re-run scripts/setup_auth.py to grant esi-wallet.read_character_wallet.v1."
                    )

                if int(response.headers.get("X-Esi-Error-Limit-Remain", 100)) < ERROR_LIMIT_THRESHOLD:
                    logger.warning("Approaching ESI Error Limit while loading wallet transactions.")
                    raise Exception("ESI Error Limit approaching threshold.")

                response.raise_for_status()
                payload = await response.json()
                transactions: list[WalletTransaction] = []
                for entry in payload:
                    issued_at = datetime.datetime.fromisoformat(entry["date"].replace("Z", "+00:00"))
                    transactions.append(
                        WalletTransaction(
                            transaction_id=entry["transaction_id"],
                            date=issued_at,
                            location_id=entry["location_id"],
                            type_id=entry["type_id"],
                            unit_price=entry["unit_price"],
                            quantity=entry["quantity"],
                            client_id=entry["client_id"],
                            is_buy=entry["is_buy"],
                            is_personal=entry["is_personal"],
                            journal_ref_id=entry["journal_ref_id"],
                        )
                    )

                logger.info("Retrieved %d wallet transactions.", len(transactions))
                return transactions

    return []


async def get_region_orders(region_id: int) -> tuple[list[dict[str, Any]], str]:
    """
    Retrieves all market orders for a given region using asyncio and aiohttp.

    Args:
        region_id: The ID of the region.

    Returns:
        A tuple containing the list of orders and the expiry time.
    """
    url_template = f"{ESI_BASE_URL}/markets/{{region}}/orders/"
    headers = USER_AGENT_HEADER

    async def fetch_page(session: aiohttp.ClientSession, region: int, page: int, sem: asyncio.Semaphore) -> tuple[list[dict[str, Any]], str, int] | None:
        async with sem:
            params = {
                'datasource': DATASOURCE,
                'order_type': 'all',
                'page': page,
            }
            for attempt in range(3):
                try:
                    async with session.get(url_template.format(region=region), params=params, headers=headers) as response:
                        if response.status == 429:
                            logger.warning(f"Rate limited (429) on page {page} for region {region}. Retrying...")
                            await asyncio.sleep(2 * (attempt + 1))
                            continue

                        response.raise_for_status()
                        logger.debug(f"Retrieved page {page} for region {region}.")
                        
                        pages = int(response.headers.get('X-Pages', '1'))
                        expires = response.headers.get('Expires', '')
                        data = await response.json()
                        return data, expires, pages
                except aiohttp.ClientError as e:
                    logger.error(f"Error fetching page {page} for region {region} (attempt {attempt + 1}): {e}")
                    if attempt == 2:
                        return None
                    await asyncio.sleep(1)
            return None

    results: list[dict[str, Any]] = []
    expires = ''
    sem = asyncio.Semaphore(15)  # Bound concurrency to 15 active requests
    
    async with aiohttp.ClientSession() as session:
        # Fetch page 1 to get the total number of pages
        first_page_result = await fetch_page(session, region_id, 1, sem)
        if not first_page_result:
            return [], ''
            
        data, expires, total_pages = first_page_result
        results.extend(data)
        
        if total_pages > 1:
            tasks = [
                fetch_page(session, region_id, page, sem) 
                for page in range(2, total_pages + 1)
            ]
            pages_data = await asyncio.gather(*tasks)
            for page_result in pages_data:
                if page_result:
                    results.extend(page_result[0])

    # Filter out orders with zero remaining volume
    results = [order for order in results if order.get('volume_remain', 0) > 0]

    # Add region ID to each order
    for order in results:
        order['region_id'] = region_id

    logger.info(f"Retrieved {len(results)} orders for region {region_id}.")
    return results, expires


def access_token(force_refresh: bool = False) -> str:
    """
    Retrieves an active access token, refreshing it if necessary.

    Args:
        force_refresh: If True, forces a refresh of the access token.

    Returns:
        The active access token as a string.
    """
    try:
        with AUTH_FILE.open("r", encoding="utf-8") as f:
            auth: dict[str, Any] = json.load(f)
    except FileNotFoundError:
        logger.error(f"Authentication file not found at {AUTH_FILE}.")
        raise FileNotFoundError("Authentication file is missing.")

    expires_at = auth.get("expires_at", 0)
    current_time = datetime.datetime.utcnow().timestamp()
    if not force_refresh and expires_at > current_time:
        return auth.get("access_token", "")

    logger.info("Access token expired or force refresh requested, refreshing token.")
    new_auth = get_access_token_from_refresh_token(auth["refresh_token"])

    # Update expiry time (assuming token is valid for 20 minutes)
    new_auth["expires_at"] = current_time + 1200

    with AUTH_FILE.open("w", encoding="utf-8") as f:
        json.dump(new_auth, f)

    logger.info("Access token refreshed successfully.")
    return new_auth["access_token"]