package intent

import (
	"context"
	"encoding/json"
	"os"
	"testing"
)

// corpusCase 与 intentctl eval 共用同一份评测集格式（testdata/corpus.json）。
type corpusCase struct {
	Name               string            `json:"name"`
	Input              string            `json:"input"`
	ExpectBranch       string            `json:"expect_branch"`
	ExpectTop          string            `json:"expect_top"`
	ExpectSlots        map[string]string `json:"expect_slots"`
	ExpectMissingSlots []string          `json:"expect_missing_slots"`
}

type corpusDoc struct {
	Cases []corpusCase `json:"cases"`
}

func runCorpus(t *testing.T, rec Recognizer, snap *Snapshot, cases []corpusCase) {
	t.Helper()
	for _, tc := range cases {
		t.Run(tc.Name, func(t *testing.T) {
			res, err := rec.Recognize(context.Background(), tc.Input, snap)
			if err != nil {
				t.Fatalf("recognize: %v", err)
			}
			if string(res.Branch) != tc.ExpectBranch {
				t.Fatalf("branch = %s, want %s (top=%+v)", res.Branch, tc.ExpectBranch, res.Top)
			}
			if tc.ExpectTop == "" {
				if res.Top != nil {
					t.Fatalf("expected no top, got %+v", res.Top)
				}
			} else if res.Top == nil || res.Top.ID != tc.ExpectTop {
				t.Fatalf("top = %+v, want %s", res.Top, tc.ExpectTop)
			}
			for k, v := range tc.ExpectSlots {
				if res.Top == nil || res.Top.Slots[k] != v {
					t.Fatalf("slot %s = %v, want %v (top=%+v)", k, res.Top.Slots, v, res.Top)
				}
			}
			if len(tc.ExpectMissingSlots) > 0 {
				if res.Top == nil || len(res.Top.MissingRequiredSlots) != len(tc.ExpectMissingSlots) {
					t.Fatalf("missing slots = %+v, want %v", res.Top, tc.ExpectMissingSlots)
				}
				for i, k := range tc.ExpectMissingSlots {
					if res.Top.MissingRequiredSlots[i] != k {
						t.Fatalf("missing slots = %+v, want %v", res.Top.MissingRequiredSlots, tc.ExpectMissingSlots)
					}
				}
			}
		})
	}
}

// TestEvalCorpus 是模块自带的评测集回归：守护内容 Go 内置 + 业务意图 JSON 配置，
// 覆盖正常路径、守卫拦截、否定写硬负例、必填槽位缺失与大小写折叠。
func TestEvalCorpus(t *testing.T) {
	data, err := os.ReadFile("testdata/corpus.json")
	if err != nil {
		t.Fatal(err)
	}
	var doc corpusDoc
	if err := json.Unmarshal(data, &doc); err != nil {
		t.Fatal(err)
	}
	if len(doc.Cases) == 0 {
		t.Fatal("empty corpus")
	}
	_, snap := buildDemoRegistry(t)
	rec := NewRecognizer(Options{}, nil, nil)
	runCorpus(t, rec, snap, doc.Cases)
}