package main

import (
	"context"
	"strings"
	"testing"
	"time"

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

func TestParseOrdinalReadsThePosition(t *testing.T) {
	cases := []struct {
		text string
		want int
		ok   bool
	}{
		{"второй", 2, true},
		{"вторую сделал", 2, true},
		{"первую убери", 1, true},
		{"последнюю не надо", -1, true},
		{"3", 3, true},
		{"the second one", 2, true},
		// No position named.
		{"какие у меня задачи", 0, false},
		{"", 0, false},
		// A digit inside a time is not a position.
		{"напомни в 15:00", 0, false},
		// Forms the stem list used to miss, and positions past its fifth.
		{"вторым", 2, true},
		{"седьмую", 7, true},
		{"одиннадцатый", 11, true},
		// A spoken half hour names its hour with the same genitive ordinal, so
		// this is 07:30 and not the eighth thing she read out (V-522).
		{"напомни в половине восьмого", 0, false},
		{"полвосьмого", 0, false},
		// The ordinal still wins when the half word is not in front of it.
		{"восьмую сделал", 8, true},
	}
	for _, c := range cases {
		got, ok := parseOrdinal(c.text)
		if ok != c.ok || (ok && got != c.want) {
			t.Errorf("parseOrdinal(%q) = %d,%v; want %d,%v", c.text, got, ok, c.want, c.ok)
		}
	}
}

func TestOrdinalPassesWithNothingOffered(t *testing.T) {
	h, _, _ := newClarifyHandler(t)
	if _, handled := h.resolveCandidate(context.Background(), "второй", sourceVoice); handled {
		t.Error("an ordinal with no list behind it was claimed")
	}
}

func TestOrdinalReadsBackWithoutAVerb(t *testing.T) {
	h, st, _ := newClarifyHandler(t)
	ctx := context.Background()
	ids := seedTasks(t, st, "купить хлеб", "позвонить маме")
	putCandidates(h, context.Background(), ids, "купить хлеб", "позвонить маме")

	reply, handled := h.resolveCandidate(ctx, "второй", sourceVoice)
	if !handled || !strings.Contains(reply, "позвонить маме") {
		t.Fatalf("a bare ordinal did not read the task back: %q handled=%v", reply, handled)
	}
	// Still live: naming one is often the first half of a sentence.
	if _, handled := h.resolveCandidate(ctx, "первый", sourceVoice); !handled {
		t.Error("the list was spent by a read-back")
	}
}

func TestOrdinalWithAVerbMovesTheTask(t *testing.T) {
	h, st, _ := newClarifyHandler(t)
	ctx := context.Background()
	ids := seedTasks(t, st, "купить хлеб", "позвонить маме")
	putCandidates(h, context.Background(), ids, "купить хлеб", "позвонить маме")

	reply, handled := h.resolveCandidate(ctx, "первую сделал", sourceVoice)
	if !handled || !strings.Contains(reply, "купить хлеб") {
		t.Fatalf("the pick was not acted on: %q handled=%v", reply, handled)
	}
	live, err := st.ListTasks(ctx, "live")
	if err != nil {
		t.Fatalf("list tasks: %v", err)
	}
	for _, task := range live {
		if task.ID == ids[0] {
			t.Fatalf("task %d is still live after he closed it", task.ID)
		}
	}
	// Spent: a second ordinal against a list that no longer holds would close
	// the wrong task.
	if _, handled := h.resolveCandidate(ctx, "второй", sourceVoice); handled {
		t.Error("the list survived the pick it was spent on")
	}
}

func TestOrdinalPastTheEndSaysHowMany(t *testing.T) {
	h, st, _ := newClarifyHandler(t)
	ids := seedTasks(t, st, "купить хлеб")
	putCandidates(h, context.Background(), ids, "купить хлеб")

	reply, handled := h.resolveCandidate(context.Background(), "третий", sourceVoice)
	if !handled || !strings.Contains(reply, "1") {
		t.Fatalf("a position she never read was not answered: %q handled=%v", reply, handled)
	}
}

// ordinalNow — a fixed capture time; the ranker only needs the rows to exist.
var ordinalNow = time.Date(2026, 8, 4, 9, 0, 0, 0, time.UTC)

func seedTasks(t *testing.T, st *store.Store, texts ...string) []int64 {
	t.Helper()
	ctx := context.Background()
	var ids []int64
	for _, text := range texts {
		res, err := st.CaptureTask(ctx, store.Task{
			Text:      text,
			Source:    "tap:voice",
			Status:    store.TaskOpen,
			CreatedTs: ordinalNow,
		})
		if err != nil {
			t.Fatalf("capture task: %v", err)
		}
		ids = append(ids, res.ID)
	}
	return ids
}

// putCandidates binds a list to the reach the ctx names, the way queryTasks
// does when she recites one.
func putCandidates(h *reactiveHandler, ctx context.Context, ids []int64, labels ...string) {
	cands := make([]dialogue.Candidate, 0, len(ids))
	for i, id := range ids {
		cands = append(cands, dialogue.Candidate{Kind: "task", Ref: id, Label: labels[i]})
	}
	h.dialogueSessions.Put(dialogueIDOf(ctx), &dialogue.Session{Timestamp: h.now()})
	h.offerCandidates(ctx, cands)
}