| 1 | """Date utilities for last30days skill.""" |
| 2 | |
| 3 | from datetime import datetime, timedelta, timezone |
| 4 | from typing import Optional, Tuple |
| 5 | |
| 6 | |
| 7 | def parse_as_of_date(as_of_date: Optional[str]) -> Optional[str]: |
| 8 | """Validate and normalize an --as-of date. |
| 9 | |
| 10 | Args: |
| 11 | as_of_date: Date string in YYYY-MM-DD format. |
| 12 | |
| 13 | Returns: |
| 14 | Normalized YYYY-MM-DD string, or None when no date was provided. |
| 15 | |
| 16 | Raises: |
| 17 | ValueError: If the date is not in YYYY-MM-DD format. |
| 18 | """ |
| 19 | if as_of_date is None: |
| 20 | return None |
| 21 | |
| 22 | if not as_of_date.strip(): |
| 23 | raise ValueError("--as-of must be in YYYY-MM-DD format.") |
| 24 | |
| 25 | try: |
| 26 | parsed = datetime.strptime(as_of_date, "%Y-%m-%d").date() |
| 27 | except ValueError as exc: |
| 28 | raise ValueError( |
| 29 | f"Invalid --as-of date: {as_of_date}. Expected YYYY-MM-DD." |
| 30 | ) from exc |
| 31 | |
| 32 | return parsed.isoformat() |
| 33 | |
| 34 | |
| 35 | def get_date_range(days: int = 30, as_of_date: Optional[str] = None) -> Tuple[str, str]: |
| 36 | """Get the date range for the last N days. |
| 37 | |
| 38 | When as_of_date is provided, the range ends at that date instead of today. |
| 39 | |
| 40 | Args: |
| 41 | days: Number of days to look back. |
| 42 | as_of_date: Optional end date in YYYY-MM-DD format. |
| 43 | |
| 44 | Returns: |
| 45 | Tuple of (from_date, to_date) as YYYY-MM-DD strings. |
| 46 | """ |
| 47 | normalized_as_of = parse_as_of_date(as_of_date) |
| 48 | |
| 49 | if normalized_as_of: |
| 50 | to_date = datetime.strptime(normalized_as_of, "%Y-%m-%d").date() |
| 51 | else: |
| 52 | to_date = datetime.now(timezone.utc).date() |
| 53 | |
| 54 | from_date = to_date - timedelta(days=days) |
| 55 | return from_date.isoformat(), to_date.isoformat() |
| 56 | |
| 57 | |
| 58 | def parse_date(date_str: Optional[str]) -> Optional[datetime]: |
| 59 | """Parse a date string in various formats. |
| 60 | |
| 61 | Supports: YYYY-MM-DD, ISO 8601, Unix timestamp |
| 62 | """ |
| 63 | if not date_str: |
| 64 | return None |
| 65 | |
| 66 | # Try Unix timestamp (from Reddit) |
| 67 | try: |
| 68 | ts = float(date_str) |
| 69 | return datetime.fromtimestamp(ts, tz=timezone.utc) |
| 70 | except (ValueError, TypeError): |
| 71 | pass |
| 72 | |
| 73 | # Try ISO formats |
| 74 | formats = [ |
| 75 | "%Y-%m-%d", |
| 76 | "%Y-%m-%dT%H:%M:%S", |
| 77 | "%Y-%m-%dT%H:%M:%SZ", |
| 78 | "%Y-%m-%dT%H:%M:%S%z", |
| 79 | "%Y-%m-%dT%H:%M:%S.%f%z", |
| 80 | ] |
| 81 | |
| 82 | for fmt in formats: |
| 83 | try: |
| 84 | dt = datetime.strptime(date_str, fmt) |
| 85 | if dt.tzinfo is not None: |
| 86 | return dt.astimezone(timezone.utc) |
| 87 | return dt.replace(tzinfo=timezone.utc) |
| 88 | except ValueError: |
| 89 | continue |
| 90 | |
| 91 | return None |
| 92 | |
| 93 | |
| 94 | def timestamp_to_date(ts: Optional[float]) -> Optional[str]: |
| 95 | """Convert Unix timestamp to YYYY-MM-DD string.""" |
| 96 | if ts is None: |
| 97 | return None |
| 98 | try: |
| 99 | dt = datetime.fromtimestamp(ts, tz=timezone.utc) |
| 100 | return dt.date().isoformat() |
| 101 | except (ValueError, TypeError, OSError): |
| 102 | return None |
| 103 | |
| 104 | |
| 105 | def get_date_confidence(date_str: Optional[str], from_date: str, to_date: str) -> str: |
| 106 | """Determine confidence level for a date. |
| 107 | |
| 108 | Args: |
| 109 | date_str: The date to check (YYYY-MM-DD or None) |
| 110 | from_date: Start of valid range (YYYY-MM-DD) |
| 111 | to_date: End of valid range (YYYY-MM-DD) |
| 112 | |
| 113 | Returns: |
| 114 | 'high', 'med', or 'low' |
| 115 | """ |
| 116 | if not date_str: |
| 117 | return 'low' |
| 118 | |
| 119 | try: |
| 120 | dt = datetime.strptime(date_str, "%Y-%m-%d").date() |
| 121 | start = datetime.strptime(from_date, "%Y-%m-%d").date() |
| 122 | end = datetime.strptime(to_date, "%Y-%m-%d").date() |
| 123 | |
| 124 | return 'high' if start <= dt <= end else 'low' |
| 125 | except ValueError: |
| 126 | return 'low' |
| 127 | |
| 128 | |
| 129 | def days_ago(date_str: Optional[str], reference_date: Optional[str] = None) -> Optional[int]: |
| 130 | """Calculate how many days before the reference date a date is. |
| 131 | |
| 132 | If reference_date is None, use real today for backward compatibility. |
| 133 | Returns None if date is invalid or missing. |
| 134 | """ |
| 135 | if not date_str: |
| 136 | return None |
| 137 | |
| 138 | try: |
| 139 | dt = datetime.strptime(date_str, "%Y-%m-%d").date() |
| 140 | if reference_date: |
| 141 | today = datetime.strptime(reference_date, "%Y-%m-%d").date() |
| 142 | else: |
| 143 | today = datetime.now(timezone.utc).date() |
| 144 | delta = today - dt |
| 145 | return delta.days |
| 146 | except ValueError: |
| 147 | return None |
| 148 | |
| 149 | |
| 150 | def recency_score( |
| 151 | date_str: Optional[str], |
| 152 | max_days: int = 30, |
| 153 | reference_date: Optional[str] = None, |
| 154 | ) -> int: |
| 155 | """Calculate recency score (0-100). |
| 156 | |
| 157 | 0 days before reference_date = 100, max_days before reference_date = 0. |
| 158 | If reference_date is None, use real today for backward compatibility. |
| 159 | """ |
| 160 | age = days_ago(date_str, reference_date=reference_date) |
| 161 | if age is None: |
| 162 | return 0 |
| 163 | |
| 164 | if age < 0: |
| 165 | return 100 |
| 166 | if age >= max_days: |
| 167 | return 0 |
| 168 | |
| 169 | return int(100 * (1 - age / max_days)) |
| 170 |