package org.terst.doot.widget.ui

import org.junit.Assert.assertEquals
import org.junit.Test
import java.time.LocalDate

class TaskDetailActivityTest {

    private val anchor = LocalDate.of(2026, 8, 6) // Thursday

    @Test
    fun `postponeDate tomorrow is a single day ahead`() {
        assertEquals("2026-08-07", postponeDate(PostponePeriod.TOMORROW, anchor))
    }

    @Test
    fun `postponeDate next week is seven days ahead`() {
        assertEquals("2026-08-13", postponeDate(PostponePeriod.NEXT_WEEK, anchor))
    }

    @Test
    fun `postponeDate next month is a calendar month ahead`() {
        assertEquals("2026-09-06", postponeDate(PostponePeriod.NEXT_MONTH, anchor))
    }

    @Test
    fun `postponeDate next month across a short month clamps -- NOT the same as the Go server's overflow behavior`() {
        // Verified, not assumed: java.time.LocalDate.plusMonths CLAMPS to the target
        // month's last valid day (Jan 31 -> Feb 28), unlike
        // ComputeNextOccurrence (internal/models/recurrence.go)'s Go time.AddDate,
        // which OVERFLOWS instead (Jan 31 + 1 month -> Mar 3). This is a real,
        // known divergence between this client-side postpone helper and the
        // server's recurrence date math for day-of-month 29-31 -- not something
        // this fix reconciles, just documenting it accurately instead of
        // asserting the wrong behavior.
        val jan31 = LocalDate.of(2026, 1, 31)
        assertEquals("2026-02-28", postponeDate(PostponePeriod.NEXT_MONTH, jan31))
    }
}