src/tools/datetime_tool.py

"""DateTime tool implementation."""

from __future__ import annotations

from dataclasses import dataclass, field
from datetime import datetime, timedelta
from typing import Any
from zoneinfo import ZoneInfo

from src.tools.base import Tool, ToolParameter, ToolResult
from src.utils.logging import get_logger

logger = get_logger(__name__)


@dataclass
class DateTimeTool(Tool):
    """Tool for date and time operations."""

    name: str = "datetime"
    description: str = "Perform date/time operations: get current time, convert timezones, calculate date differences, add/subtract durations."
    parameters: list[ToolParameter] = field(default_factory=lambda: [
        ToolParameter(
            name="operation",
            type="string",
            description="The operation to perform",
            required=True,
            enum=["current", "convert_timezone", "date_diff", "add_duration", "format", "parse"],
        ),
        ToolParameter(
            name="timezone",
            type="string",
            description="Timezone for the operation (e.g., 'America/New_York', 'UTC', 'Asia/Tokyo')",
            required=False,
            default="UTC",
        ),
        ToolParameter(
            name="date",
            type="string",
            description="Date string for operations (ISO format: YYYY-MM-DD or YYYY-MM-DDTHH:MM:SS)",
            required=False,
        ),
        ToolParameter(
            name="date2",
            type="string",
            description="Second date for date_diff operation",
            required=False,
        ),
        ToolParameter(
            name="days",
            type="integer",
            description="Number of days for add_duration operation",
            required=False,
            default=0,
        ),
        ToolParameter(
            name="hours",
            type="integer",
            description="Number of hours for add_duration operation",
            required=False,
            default=0,
        ),
        ToolParameter(
            name="target_timezone",
            type="string",
            description="Target timezone for convert_timezone operation",
            required=False,
        ),
        ToolParameter(
            name="format_string",
            type="string",
            description="Format string for format operation (e.g., '%Y-%m-%d %H:%M')",
            required=False,
            default="%Y-%m-%d %H:%M:%S %Z",
        ),
    ])

    async def execute(self, **kwargs: Any) -> ToolResult:
        """Execute a datetime operation.
        
        Args:
            operation: Operation to perform
            **kwargs: Operation-specific parameters
            
        Returns:
            ToolResult with datetime result
        """
        operation = kwargs.get("operation", "current")

        try:
            if operation == "current":
                return await self._get_current(kwargs)
            elif operation == "convert_timezone":
                return await self._convert_timezone(kwargs)
            elif operation == "date_diff":
                return await self._date_diff(kwargs)
            elif operation == "add_duration":
                return await self._add_duration(kwargs)
            elif operation == "format":
                return await self._format_date(kwargs)
            elif operation == "parse":
                return await self._parse_date(kwargs)
            else:
                return ToolResult.fail(f"Unknown operation: {operation}")

        except Exception as e:
            logger.error(f"DateTime operation failed: {e}")
            return ToolResult.fail(f"DateTime operation failed: {e}")

    async def _get_current(self, kwargs: dict[str, Any]) -> ToolResult:
        """Get current date/time."""
        timezone_str = kwargs.get("timezone", "UTC")

        try:
            tz = ZoneInfo(timezone_str)
        except Exception:
            return ToolResult.fail(f"Invalid timezone: {timezone_str}")

        now = datetime.now(tz)

        return ToolResult.ok({
            "operation": "current",
            "timezone": timezone_str,
            "datetime": now.isoformat(),
            "date": now.strftime("%Y-%m-%d"),
            "time": now.strftime("%H:%M:%S"),
            "day_of_week": now.strftime("%A"),
            "unix_timestamp": int(now.timestamp()),
        })

    async def _convert_timezone(self, kwargs: dict[str, Any]) -> ToolResult:
        """Convert datetime between timezones."""
        date_str = kwargs.get("date")
        source_tz = kwargs.get("timezone", "UTC")
        target_tz = kwargs.get("target_timezone")

        if not date_str:
            return ToolResult.fail("Date is required for timezone conversion")
        if not target_tz:
            return ToolResult.fail("Target timezone is required")

        try:
            source = ZoneInfo(source_tz)
            target = ZoneInfo(target_tz)
        except Exception as e:
            return ToolResult.fail(f"Invalid timezone: {e}")

        # Parse the date
        dt = self._parse_datetime(date_str)
        if dt.tzinfo is None:
            dt = dt.replace(tzinfo=source)

        # Convert
        converted = dt.astimezone(target)

        return ToolResult.ok({
            "operation": "convert_timezone",
            "source_timezone": source_tz,
            "target_timezone": target_tz,
            "original": dt.isoformat(),
            "converted": converted.isoformat(),
        })

    async def _date_diff(self, kwargs: dict[str, Any]) -> ToolResult:
        """Calculate difference between two dates."""
        date1_str = kwargs.get("date")
        date2_str = kwargs.get("date2")

        if not date1_str or not date2_str:
            return ToolResult.fail("Both dates are required for date_diff")

        dt1 = self._parse_datetime(date1_str)
        dt2 = self._parse_datetime(date2_str)

        diff = dt2 - dt1
        total_seconds = diff.total_seconds()

        return ToolResult.ok({
            "operation": "date_diff",
            "date1": dt1.isoformat(),
            "date2": dt2.isoformat(),
            "difference": {
                "days": diff.days,
                "total_seconds": total_seconds,
                "total_hours": total_seconds / 3600,
                "total_minutes": total_seconds / 60,
                "weeks": diff.days / 7,
            },
        })

    async def _add_duration(self, kwargs: dict[str, Any]) -> ToolResult:
        """Add a duration to a date."""
        date_str = kwargs.get("date")
        days = kwargs.get("days", 0)
        hours = kwargs.get("hours", 0)
        timezone_str = kwargs.get("timezone", "UTC")

        if date_str:
            dt = self._parse_datetime(date_str)
        else:
            tz = ZoneInfo(timezone_str)
            dt = datetime.now(tz)

        duration = timedelta(days=days, hours=hours)
        result = dt + duration

        return ToolResult.ok({
            "operation": "add_duration",
            "original": dt.isoformat(),
            "duration": {"days": days, "hours": hours},
            "result": result.isoformat(),
            "result_date": result.strftime("%Y-%m-%d"),
            "result_day": result.strftime("%A"),
        })

    async def _format_date(self, kwargs: dict[str, Any]) -> ToolResult:
        """Format a date with a custom format string."""
        date_str = kwargs.get("date")
        format_string = kwargs.get("format_string", "%Y-%m-%d %H:%M:%S")
        timezone_str = kwargs.get("timezone", "UTC")

        if date_str:
            dt = self._parse_datetime(date_str)
        else:
            tz = ZoneInfo(timezone_str)
            dt = datetime.now(tz)

        formatted = dt.strftime(format_string)

        return ToolResult.ok({
            "operation": "format",
            "datetime": dt.isoformat(),
            "format_string": format_string,
            "formatted": formatted,
        })

    async def _parse_date(self, kwargs: dict[str, Any]) -> ToolResult:
        """Parse a date string into components."""
        date_str = kwargs.get("date")

        if not date_str:
            return ToolResult.fail("Date string is required for parse")

        dt = self._parse_datetime(date_str)

        return ToolResult.ok({
            "operation": "parse",
            "input": date_str,
            "parsed": {
                "year": dt.year,
                "month": dt.month,
                "day": dt.day,
                "hour": dt.hour,
                "minute": dt.minute,
                "second": dt.second,
                "day_of_week": dt.strftime("%A"),
                "iso_format": dt.isoformat(),
            },
        })

    def _parse_datetime(self, date_str: str) -> datetime:
        """Parse a datetime string in various formats.
        
        Args:
            date_str: Date string to parse
            
        Returns:
            Parsed datetime object
        """
        formats = [
            "%Y-%m-%dT%H:%M:%S%z",
            "%Y-%m-%dT%H:%M:%S",
            "%Y-%m-%d %H:%M:%S",
            "%Y-%m-%d",
            "%m/%d/%Y",
            "%d/%m/%Y",
            "%B %d, %Y",
        ]

        for fmt in formats:
            try:
                return datetime.strptime(date_str, fmt)
            except ValueError:
                continue

        # Try ISO format parsing
        try:
            return datetime.fromisoformat(date_str)
        except ValueError:
            pass

        raise ValueError(f"Could not parse date: {date_str}")