package intent

import (
	"errors"
	"testing"
)

func validSpec() IntentSpec {
	return IntentSpec{
		ID:      "demo.run.status_query",
		Domain:  "demo",
		Version: 1,
		Matcher: MatchSpec{IncludesAny: []string{"进度"}},
	}
}

func TestValidateSpecAcceptsValid(t *testing.T) {
	lim := Options{}.normalized().limits()
	if err := validateSpec(validSpec(), lim, nil); err != nil {
		t.Fatalf("valid spec rejected: %v", err)
	}
}

func TestValidateSpecDefaultsNoLimits(t *testing.T) {
	// 零值 limits 跳过数量上限（供意图较少的宿主直接校验）。
	if err := validateSpec(validSpec(), limits{}, nil); err != nil {
		t.Fatalf("valid spec rejected without limits: %v", err)
	}
}

func TestValidateSpecRejections(t *testing.T) {
	lim := Options{}.normalized().limits()
	cases := []struct {
		name  string
		mut   func(*IntentSpec)
		field string
	}{
		{"empty_domain", func(s *IntentSpec) { s.Domain = "" }, "domain"},
		{"bad_domain_case", func(s *IntentSpec) { s.Domain = "Demo" }, "domain"},
		{"id_prefix_mismatch", func(s *IntentSpec) { s.ID = "other.status_query" }, "id"},
		{"bad_mnemonic", func(s *IntentSpec) { s.ID = "demo.Status-Query" }, "id"},
		{"zero_version", func(s *IntentSpec) { s.Version = 0 }, "version"},
		{"bad_risk", func(s *IntentSpec) { s.Risk = "extreme" }, "risk"},
		{"empty_matcher", func(s *IntentSpec) { s.Matcher = MatchSpec{} }, "matcher"},
		{"empty_term", func(s *IntentSpec) { s.Matcher = MatchSpec{IncludesAny: []string{" "}} }, "matcher.includes_any"},
		{"bad_pattern", func(s *IntentSpec) { s.Matcher = MatchSpec{IncludesAny: []string{"a"}, Patterns: []string{"["}} }, "matcher.patterns[0]"},
		{"too_many_patterns", func(s *IntentSpec) {
			s.Matcher = MatchSpec{IncludesAny: []string{"a"}, Patterns: make([]string, lim.maxPatternsPerSpec+1)}
			for i := range s.Matcher.Patterns {
				s.Matcher.Patterns[i] = "x"
			}
		}, "matcher.patterns"},
		{"bad_slot_key", func(s *IntentSpec) {
			s.Slots = []SlotSpec{{Key: "RunID", Pattern: "(x)"}}
		}, "slots[0].key"},
		{"bad_slot_pattern", func(s *IntentSpec) {
			s.Slots = []SlotSpec{{Key: "run_id", Pattern: "["}}
		}, "slots[0].pattern"},
		{"slot_group_out_of_range", func(s *IntentSpec) {
			s.Slots = []SlotSpec{{Key: "run_id", Pattern: "(x)", Group: 2}}
		}, "slots[0].group"},
		{"base_out_of_range", func(s *IntentSpec) {
			s.Confidence = ConfidenceSpec{Base: 1.5}
		}, "confidence.base"},
		{"bonus_out_of_range", func(s *IntentSpec) {
			s.Confidence = ConfidenceSpec{PatternBonus: 1.0}
		}, "confidence.pattern_bonus"},
		{"threshold_out_of_range", func(s *IntentSpec) {
			s.Confidence = ConfidenceSpec{Threshold: -0.1}
		}, "confidence.threshold"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			spec := validSpec()
			tc.mut(&spec)
			err := validateSpec(spec, lim, nil)
			if err == nil {
				t.Fatalf("expected rejection")
			}
			var e *Error
			if !errors.As(err, &e) || e.Code != InvalidSpec {
				t.Fatalf("expected intent.invalid_spec, got %v", err)
			}
			if got, _ := e.Fields["field"].(string); got != tc.field && !hasPrefix(got, tc.field) {
				t.Fatalf("expected field %q, got %q (fields=%v)", tc.field, got, e.Fields)
			}
		})
	}
}

func hasPrefix(s, p string) bool {
	return len(s) >= len(p) && s[:len(p)] == p
}

func TestValidateSpecIncludesAllOnly(t *testing.T) {
	// 仅 includes_all 也是合法正向条件。
	spec := validSpec()
	spec.Matcher = MatchSpec{IncludesAll: []string{"任务", "进度"}}
	if err := validateSpec(spec, Options{}.normalized().limits(), nil); err != nil {
		t.Fatalf("includes_all-only spec rejected: %v", err)
	}
}

func TestErrorCodeDuckInterface(t *testing.T) {
	err := newError(InvalidSpec, "msg", "id", "demo.x")
	if err.ErrorCode() != InvalidSpec {
		t.Fatalf("code mismatch")
	}
	fields := err.ErrorFields()
	if fields["id"] != "demo.x" {
		t.Fatalf("fields mismatch: %v", fields)
	}
	if err.Error() == "" {
		t.Fatal("empty error string")
	}
}