{
  "format": 1,
  "function": "match_card_purchase",
  "cases": [
    {
      "name": "no expenses",
      "input": {
        "purchase": {
          "amount_ore": 12900,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": []
      }
    },
    {
      "name": "exact amount, same day",
      "input": {
        "purchase": {
          "amount_ore": 12900,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 12900,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001"
        ]
      }
    },
    {
      "name": "three days before and after are included",
      "input": {
        "purchase": {
          "amount_ore": 12900,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 12900,
            "date": "2026-10-19",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 12900,
            "date": "2026-10-25",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001",
          "0192e000-0000-7000-8000-000000000002"
        ]
      }
    },
    {
      "name": "four days before or after are excluded",
      "input": {
        "purchase": {
          "amount_ore": 12900,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 12900,
            "date": "2026-10-18",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 12900,
            "date": "2026-10-26",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": []
      }
    },
    {
      "name": "an amount 1 öre off is excluded",
      "input": {
        "purchase": {
          "amount_ore": 12900,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 12899,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 12901,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000003",
            "amount_ore": 12900,
            "date": "2026-10-23",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000003"
        ]
      }
    },
    {
      "name": "an expense linked from another purchase of the viewer is excluded",
      "input": {
        "purchase": {
          "amount_ore": 12900,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 12900,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": true
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 12900,
            "date": "2026-10-21",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000002"
        ]
      }
    },
    {
      "name": "ordered by day difference",
      "input": {
        "purchase": {
          "amount_ore": 5000,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 5000,
            "date": "2026-10-25",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 5000,
            "date": "2026-10-21",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000003",
            "amount_ore": 5000,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000003",
          "0192e000-0000-7000-8000-000000000002",
          "0192e000-0000-7000-8000-000000000001"
        ]
      }
    },
    {
      "name": "equal day difference: newer created_at first",
      "input": {
        "purchase": {
          "amount_ore": 5000,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 5000,
            "date": "2026-10-20",
            "created_at": "2026-10-20T08:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 5000,
            "date": "2026-10-24",
            "created_at": "2026-10-24T08:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000002",
          "0192e000-0000-7000-8000-000000000001"
        ]
      }
    },
    {
      "name": "equal day difference and created_at: lower id first",
      "input": {
        "purchase": {
          "amount_ore": 5000,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000007",
            "amount_ore": 5000,
            "date": "2026-10-23",
            "created_at": "2026-10-23T08:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000004",
            "amount_ore": 5000,
            "date": "2026-10-21",
            "created_at": "2026-10-23T08:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000004",
          "0192e000-0000-7000-8000-000000000007"
        ]
      }
    },
    {
      "name": "more candidates than max are cut",
      "input": {
        "purchase": {
          "amount_ore": 5000,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 5000,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 5000,
            "date": "2026-10-23",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000003",
            "amount_ore": 5000,
            "date": "2026-10-21",
            "created_at": "2026-10-21T08:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000004",
            "amount_ore": 5000,
            "date": "2026-10-25",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001",
          "0192e000-0000-7000-8000-000000000003",
          "0192e000-0000-7000-8000-000000000002"
        ]
      }
    },
    {
      "name": "max 1",
      "input": {
        "purchase": {
          "amount_ore": 5000,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 5000,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 5000,
            "date": "2026-10-23",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 1
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001"
        ]
      }
    },
    {
      "name": "a credit purchase has no matches",
      "input": {
        "purchase": {
          "amount_ore": 12900,
          "date": "2026-10-22",
          "direction": "credit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 12900,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": []
      }
    },
    {
      "name": "a purchase without amount (foreign currency) has no matches",
      "input": {
        "purchase": {
          "amount_ore": null,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 12900,
            "date": "2026-10-22",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": []
      }
    },
    {
      "name": "the window crosses a month boundary",
      "input": {
        "purchase": {
          "amount_ore": 30000,
          "date": "2026-11-01",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 30000,
            "date": "2026-10-29",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 30000,
            "date": "2026-10-28",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000003",
            "amount_ore": 30000,
            "date": "2026-11-04",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001",
          "0192e000-0000-7000-8000-000000000003"
        ]
      }
    },
    {
      "name": "the window crosses a year boundary",
      "input": {
        "purchase": {
          "amount_ore": 30000,
          "date": "2027-01-02",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 30000,
            "date": "2026-12-30",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 30000,
            "date": "2026-12-29",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000003",
            "amount_ore": 30000,
            "date": "2027-01-05",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001",
          "0192e000-0000-7000-8000-000000000003"
        ]
      }
    },
    {
      "name": "a leap day inside the window",
      "input": {
        "purchase": {
          "amount_ore": 2500,
          "date": "2028-03-01",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 2500,
            "date": "2028-02-27",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 2500,
            "date": "2028-02-26",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 3,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001"
        ]
      }
    },
    {
      "name": "a 14-day window (other callers)",
      "input": {
        "purchase": {
          "amount_ore": 2500,
          "date": "2026-10-22",
          "direction": "debit"
        },
        "expenses": [
          {
            "id": "0192e000-0000-7000-8000-000000000001",
            "amount_ore": 2500,
            "date": "2026-10-08",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          },
          {
            "id": "0192e000-0000-7000-8000-000000000002",
            "amount_ore": 2500,
            "date": "2026-10-07",
            "created_at": "2026-10-20T10:00:00.000Z",
            "linked_by_viewer": false
          }
        ],
        "window_days": 14,
        "max": 3
      },
      "expected": {
        "ok": [
          "0192e000-0000-7000-8000-000000000001"
        ]
      }
    }
  ]
}