package intent

import (
	"context"
	"testing"
)

// TestBoundaryCJKFalsePositiveSuppressed：词界开启后，「配置」不命中「配置项」（I3）。
func TestBoundaryCJKFalsePositiveSuppressed(t *testing.T) {
	mk := func(boundary bool) *Snapshot {
		b := NewRegistryBuilder(Options{})
		if err := b.Register(IntentSpec{
			ID: "demo.configure", Domain: "demo", Version: 1,
			Matcher: MatchSpec{IncludesAny: []string{"配置"}, Boundary: boundary},
		}); err != nil {
			t.Fatal(err)
		}
		reg, err := b.Build()
		if err != nil {
			t.Fatal(err)
		}
		return reg.Snapshot()
	}
	res, err := NewRecognizer(Options{}, nil, nil).Recognize(context.Background(), "配置项在哪里", mk(true))
	if err != nil {
		t.Fatal(err)
	}
	if res.Branch != BranchFallback {
		t.Fatalf("boundary on: branch = %s, want fallback", res.Branch)
	}
	// 词界关闭（旧行为）：子串命中依旧，证明差异来自 boundary。
	res, err = NewRecognizer(Options{}, nil, nil).Recognize(context.Background(), "配置项在哪里", mk(false))
	if err != nil {
		t.Fatal(err)
	}
	if res.Branch != BranchMatched {
		t.Fatalf("boundary off: branch = %s, want matched", res.Branch)
	}
	// 词界开启时，独立成词的「配置」照常命中。
	res, err = NewRecognizer(Options{}, nil, nil).Recognize(context.Background(), "我要改配置", mk(true))
	if err != nil {
		t.Fatal(err)
	}
	if res.Branch != BranchMatched {
		t.Fatalf("boundary on, standalone term: branch = %s, want matched", res.Branch)
	}
}

// TestBoundaryLatinWordFlank：拉丁词界——write 不命中 rewrites。
func TestBoundaryLatinWordFlank(t *testing.T) {
	b := NewRegistryBuilder(Options{})
	if err := b.Register(IntentSpec{
		ID: "demo.write", Domain: "demo", Version: 1,
		Matcher: MatchSpec{IncludesAny: []string{"write"}, Boundary: true},
	}); err != nil {
		t.Fatal(err)
	}
	reg, err := b.Build()
	if err != nil {
		t.Fatal(err)
	}
	snap := reg.Snapshot()
	res, err := NewRecognizer(Options{}, nil, nil).Recognize(context.Background(), "rewrites everything", snap)
	if err != nil {
		t.Fatal(err)
	}
	if res.Branch != BranchFallback {
		t.Fatalf("branch = %s, want fallback", res.Branch)
	}
	res, err = NewRecognizer(Options{}, nil, nil).Recognize(context.Background(), "please write this", snap)
	if err != nil {
		t.Fatal(err)
	}
	if res.Branch != BranchMatched {
		t.Fatalf("branch = %s, want matched", res.Branch)
	}
}

// TestTieBreakByPriority：同分时高 Priority 胜出（I5）；同分同 Priority 仍标歧。
func TestTieBreakByPriority(t *testing.T) {
	mk := func(p1, p2 int) *Snapshot {
		b := NewRegistryBuilder(Options{})
		if err := b.Register(IntentSpec{ID: "demo.alpha", Domain: "demo", Version: 1, Priority: p1, Matcher: MatchSpec{IncludesAny: []string{"同分词"}}}); err != nil {
			t.Fatal(err)
		}
		if err := b.Register(IntentSpec{ID: "demo.beta", Domain: "demo", Version: 1, Priority: p2, Matcher: MatchSpec{IncludesAny: []string{"同分词"}}}); err != nil {
			t.Fatal(err)
		}
		reg, err := b.Build()
		if err != nil {
			t.Fatal(err)
		}
		return reg.Snapshot()
	}
	res, err := NewRecognizer(Options{}, nil, nil).Recognize(context.Background(), "同分词", mk(10, 0))
	if err != nil {
		t.Fatal(err)
	}
	if res.Branch != BranchMatched || res.Top == nil || res.Top.ID != "demo.alpha" {
		t.Fatalf("tie-break: branch = %s top = %+v", res.Branch, res.Top)
	}
	// 同分同 Priority：仍 ambiguous。
	res, err = NewRecognizer(Options{}, nil, nil).Recognize(context.Background(), "同分词", mk(5, 5))
	if err != nil {
		t.Fatal(err)
	}
	if res.Branch != BranchAmbiguous {
		t.Fatalf("same priority: branch = %s, want ambiguous", res.Branch)
	}
	// Explain 与裁决同规则。
	tr := mk(10, 0).Explain("同分词")
	if tr.Branch != BranchMatched || tr.TopID != "demo.alpha" {
		t.Fatalf("explain = %+v", tr)
	}
}