package store

import (
	"context"
	"testing"
	"time"
)

// TestItemsForChildAndDelete covers the Phase 5 reads and the Delete half of
// FR-10: one child's items are read alone, one item is fetched by id, and
// deleting it removes exactly one row.
func TestItemsForChildAndDelete(t *testing.T) {
	ctx := context.Background()
	st := newTestStore(t)

	harry, _ := st.ChildByName(ctx, "Harry")
	finn, _ := st.ChildByName(ctx, "Finn")

	due := time.Date(2026, 10, 10, 9, 0, 0, 0, time.UTC)
	if _, _, err := st.UpsertItems(ctx, harry.ID, []Item{
		{Source: "compass", Type: "task", Subject: "English", Title: "Essay", ExternalRef: "h1", DueAt: &due, Body: "Status: Overdue"},
		{Source: "compass", Type: "message", Title: "Notice", ExternalRef: "h2"},
	}); err != nil {
		t.Fatalf("upsert harry: %v", err)
	}
	if _, _, err := st.UpsertItems(ctx, finn.ID, []Item{
		{Source: "compass", Type: "task", Title: "Lab report", ExternalRef: "f1"},
	}); err != nil {
		t.Fatalf("upsert finn: %v", err)
	}

	rows, err := st.ItemsForChild(ctx, harry.ID)
	if err != nil {
		t.Fatalf("items for child: %v", err)
	}
	if len(rows) != 2 {
		t.Fatalf("harry rows = %d, want 2", len(rows))
	}
	var essay *Item
	for i := range rows {
		if rows[i].ChildID != harry.ID {
			t.Errorf("row belongs to child %d", rows[i].ChildID)
		}
		if rows[i].ExternalRef == "h1" {
			essay = &rows[i]
		}
	}
	if essay == nil || essay.DueAt == nil || !essay.DueAt.Equal(due) {
		t.Fatalf("essay due not stored: %+v", essay)
	}

	got, err := st.ItemByID(ctx, essay.ID)
	if err != nil || got == nil {
		t.Fatalf("item by id: %v %v", got, err)
	}
	if got.Title != "Essay" || got.Child != "Harry" {
		t.Errorf("item by id = %+v", got)
	}

	n, err := st.DeleteItemByID(ctx, essay.ID)
	if err != nil || n != 1 {
		t.Fatalf("delete = %d, %v", n, err)
	}
	if got, _ := st.ItemByID(ctx, essay.ID); got != nil {
		t.Error("item survived delete")
	}
	if rows, _ := st.ItemsForChild(ctx, finn.ID); len(rows) != 1 {
		t.Errorf("finn rows = %d, want 1 (delete must not cross children)", len(rows))
	}
	// Deleting a missing id is a quiet no-op, not an error.
	if n, err := st.DeleteItemByID(ctx, essay.ID); err != nil || n != 0 {
		t.Errorf("second delete = %d, %v", n, err)
	}
}

// TestSummariesRoundTrip covers the stored brief: create a draft, list it,
// fetch it and delete it (FR-10 summary half).
func TestSummariesRoundTrip(t *testing.T) {
	ctx := context.Background()
	st := newTestStore(t)

	id, err := st.CreateSummary(ctx, "Harry", "Harry — 1 overdue.\n\nOVERDUE\n- Essay\n")
	if err != nil || id == 0 {
		t.Fatalf("create: %v id=%d", err, id)
	}
	list, err := st.ListSummaries(ctx, 10)
	if err != nil || len(list) != 1 {
		t.Fatalf("list: %v len=%d", err, len(list))
	}
	if list[0].Recipient != "Harry" || list[0].SentAt != nil {
		t.Errorf("summary = %+v, want draft for Harry", list[0])
	}
	got, err := st.SummaryByID(ctx, id)
	if err != nil || got == nil || got.Text != list[0].Text {
		t.Fatalf("by id: %v %+v", err, got)
	}
	n, err := st.DeleteSummary(ctx, id)
	if err != nil || n != 1 {
		t.Fatalf("delete = %d, %v", n, err)
	}
	if got, _ := st.SummaryByID(ctx, id); got != nil {
		t.Error("summary survived delete")
	}
}

// TestScanSummaryForChild proves a failed scan for one child is visible for
// that child even when the other child has not been scanned (FR-12).
func TestScanSummaryForChild(t *testing.T) {
	ctx := context.Background()
	st := newTestStore(t)
	harry, _ := st.ChildByName(ctx, "Harry")
	finn, _ := st.ChildByName(ctx, "Finn")

	if _, err := st.RecordScan(ctx, &finn.ID, 0, 0, false, "login challenge"); err != nil {
		t.Fatalf("record: %v", err)
	}
	if _, err := st.RecordScan(ctx, &harry.ID, 3, 12, true, ""); err != nil {
		t.Fatalf("record: %v", err)
	}

	hs, err := st.ScanSummaryForChild(ctx, harry.ID)
	if err != nil || !hs.EverRun || hs.Last == nil || !hs.Last.OK {
		t.Fatalf("harry scan summary = %+v, %v", hs, err)
	}
	fs, err := st.ScanSummaryForChild(ctx, finn.ID)
	if err != nil || !fs.EverRun || fs.Last == nil || fs.Last.OK {
		t.Fatalf("finn scan summary = %+v, %v", fs, err)
	}
	if fs.Failed != 1 {
		t.Errorf("finn failed = %d, want 1", fs.Failed)
	}
}