package main

import (
	"context"
	"database/sql"
	"testing"
	"time"

	"github.com/kami/maven/internal/store"
)

// seedRefillEvents writes N weekly "refill/cat_water" events straight to the
// events table — this is what the tick reads, independent of any utterance.
func seedRefillEvents(t *testing.T, st *store.Store, ctx context.Context, base time.Time, n int) {
	t.Helper()
	for i := 0; i < n; i++ {
		factID, err := st.WriteFact(ctx, base.Add(time.Duration(i)*7*24*time.Hour), store.KindSelf,
			"cat_water", "refill", "test", 1.0, sql.NullInt64{})
		if err != nil {
			t.Fatalf("write fact %d: %v", i, err)
		}
		if _, err := st.CreateEvent(ctx, factID, "refill", "cat_water", base.Add(time.Duration(i)*7*24*time.Hour)); err != nil {
			t.Fatalf("create event %d: %v", i, err)
		}
	}
}

// TestTickDetectsPatternFromStoredEvents proves the tick notices a pattern on
// its own, reading straight from the store — not as a side effect of a live
// utterance (Vikunja #43). Three weekly events with no voice turn in sight
// must produce exactly one proposed routine.
func TestTickDetectsPatternFromStoredEvents(t *testing.T) {
	st := newTestStore(t)
	ctx := context.Background()
	now := refNow()
	seedRefillEvents(t, st, ctx, now, 3)

	tl := newTestTickLoop(t, st, &fakeSink{}, nil)
	tl.detectPatterns(ctx, now)

	rows, err := st.ListProposedRoutines(ctx)
	if err != nil {
		t.Fatalf("list proposed routines: %v", err)
	}
	if len(rows) != 1 {
		t.Fatalf("proposed routines = %d, want 1: %+v", len(rows), rows)
	}
	if rows[0].Action != "refill" || rows[0].Object != "cat_water" {
		t.Errorf("proposed routine = %s/%s, want refill/cat_water", rows[0].Action, rows[0].Object)
	}
}

// TestTickPatternDetectionIsIdempotent proves running the tick's pattern scan
// twice does not spam a second proposal for the same pair, and that the store
// itself is what stops the duplicate (not tick-local state) — the whole point
// of the guard, since the tick has no memory of what it proposed last time.
func TestTickPatternDetectionIsIdempotent(t *testing.T) {
	st := newTestStore(t)
	ctx := context.Background()
	now := refNow()
	seedRefillEvents(t, st, ctx, now, 3)

	tl := newTestTickLoop(t, st, &fakeSink{}, nil)
	tl.detectPatterns(ctx, now)
	tl.detectPatterns(ctx, now.Add(time.Hour))

	rows, err := st.ListProposedRoutines(ctx)
	if err != nil {
		t.Fatalf("list proposed routines: %v", err)
	}
	if len(rows) != 1 {
		t.Fatalf("proposed routines after two ticks = %d, want 1 (no duplicate): %+v", len(rows), rows)
	}
}

// TestTickPatternDetectionRespectsDismissal proves the single worst failure
// mode here — a proposal the owner already said no to coming back on the next
// tick — cannot happen. Dismissal flips the row's status in place; it must
// still be there to block re-proposal.
func TestTickPatternDetectionRespectsDismissal(t *testing.T) {
	st := newTestStore(t)
	ctx := context.Background()
	now := refNow()
	seedRefillEvents(t, st, ctx, now, 3)

	tl := newTestTickLoop(t, st, &fakeSink{}, nil)
	tl.detectPatterns(ctx, now)

	rows, err := st.ListProposedRoutines(ctx)
	if err != nil {
		t.Fatalf("list proposed routines: %v", err)
	}
	if len(rows) != 1 {
		t.Fatalf("setup: proposed routines = %d, want 1", len(rows))
	}
	if err := st.DismissProposedRoutine(ctx, rows[0].ID); err != nil {
		t.Fatalf("dismiss: %v", err)
	}

	// More events for the same pair arrive, and the tick runs again — a
	// dismissed pattern must not resurface.
	seedRefillEvents(t, st, ctx, now.Add(30*24*time.Hour), 3)
	tl.detectPatterns(ctx, now.Add(60*24*time.Hour))

	proposed, err := st.ListProposedRoutinesByStatus(ctx, store.RoutineProposed)
	if err != nil {
		t.Fatalf("list proposed: %v", err)
	}
	if len(proposed) != 0 {
		t.Fatalf("a dismissed pattern came back: %+v", proposed)
	}
	all, err := st.ListProposedRoutinesByStatus(ctx, "")
	if err != nil {
		t.Fatalf("list all: %v", err)
	}
	if len(all) != 1 {
		t.Fatalf("total rows for the pair = %d, want 1 (still dismissed, not duplicated): %+v", len(all), all)
	}
	if all[0].Status != store.RoutineDismissed {
		t.Errorf("status = %s, want dismissed", all[0].Status)
	}
}