package rules

import (
	"testing"
	"time"

	"git.pengzhan.dev/haopengzhan/rsspipe/internal/models"
)

func TestRuleEvaluator(t *testing.T) {
	eval := NewEvaluator()

	entry := models.FeedEntry{
		ID:        "entry-1",
		FeedID:    "feed-hn",
		FeedTitle: "Hacker News",
		Title:     "Announcing Go 1.24 Release",
		Author:    "Go Team",
		Content:   "<p>Go 1.24 brings new features...</p>",
		Variants: map[string]models.EntryVariant{
			"keywords": {
				EntryID:     "entry-1",
				VariantKey:  "keywords",
				ContentType: "json",
				TextValue:   `["go", "compiler", "release"]`,
			},
		},
		PublishedAt: time.Now().Add(-2 * time.Hour),
		CreatedAt:   time.Now().Add(-2 * time.Hour),
	}

	// Test 1: Title contains Go AND FeedID in list
	rule1 := models.Rule{
		ID:        "r1",
		Name:      "Tech Feeds in list",
		MatchMode: "all",
		Conditions: []models.RuleCondition{
			{Field: "feed_id", Operator: "in", Value: []string{"feed-hn", "feed-36kr", "feed-ft"}},
			{Field: "title", Operator: "contains", Value: "Go 1.24"},
		},
	}
	if !eval.Evaluate(rule1, entry) {
		t.Error("expected rule1 to match entry")
	}

	// Test 2: not_in operator
	rule2 := models.Rule{
		ID:        "r2",
		Name:      "Feed not in noise",
		MatchMode: "all",
		Conditions: []models.RuleCondition{
			{Field: "feed_id", Operator: "not_in", Value: "feed-spam,feed-ads"},
		},
	}
	if !eval.Evaluate(rule2, entry) {
		t.Error("expected rule2 to match entry")
	}

	// Test 3: contains_any operator
	rule3 := models.Rule{
		ID:        "r3",
		Name:      "Title match any keyword",
		MatchMode: "all",
		Conditions: []models.RuleCondition{
			{Field: "title", Operator: "contains_any", Value: "Rust, Python, Go 1.24"},
		},
	}
	if !eval.Evaluate(rule3, entry) {
		t.Error("expected rule3 to match entry with contains_any")
	}

	// Test 4: exists operator on variants
	rule4 := models.Rule{
		ID:        "r4",
		Name:      "Keywords exist",
		MatchMode: "all",
		Conditions: []models.RuleCondition{
			{Field: "variants.keywords", Operator: "exists"},
			{Field: "variants.nonexistent", Operator: "not_exists"},
		},
	}
	if !eval.Evaluate(rule4, entry) {
		t.Error("expected rule4 to evaluate variant existence correctly")
	}

	// Test 5: Timestamp within_last_hours
	rule5 := models.Rule{
		ID:        "r5",
		Name:      "Recent article",
		MatchMode: "all",
		Conditions: []models.RuleCondition{
			{Field: "published_at", Operator: "within_last_hours", Value: 24},
		},
	}
	if !eval.Evaluate(rule5, entry) {
		t.Error("expected rule5 to match article within last 24h")
	}

	// Test 6: Safety validator
	unsafeRule := models.Rule{
		Trigger: "variant_change",
		Conditions: []models.RuleCondition{
			{Field: "variants.tags", Operator: "exists"},
		},
		Actions: []models.RuleAction{
			{
				Type: "set_variant",
				Params: map[string]interface{}{
					"variant_key": "tags",
					"value":       "new-tag",
				},
			},
		},
	}
	if err := ValidateRuleSafety(unsafeRule); err == nil {
		t.Error("expected ValidateRuleSafety to detect cyclic loop")
	}
}

func TestTransitionEvaluation(t *testing.T) {
	eval := NewEvaluator()

	oldEntry := models.FeedEntry{
		ID:        "entry-2",
		FeedID:    "feed-1",
		FeedTitle: "Tech Blog",
		Title:     "Deep Dive into Go Scheduler",
		Content:   "Short intro...",
		Variants:  map[string]models.EntryVariant{},
	}

	newEntryWithFullText := models.FeedEntry{
		ID:        "entry-2",
		FeedID:    "feed-1",
		FeedTitle: "Tech Blog",
		Title:     "Deep Dive into Go Scheduler",
		Content:   "Short intro...",
		Variants: map[string]models.EntryVariant{
			"readability_full_text": {
				EntryID:    "entry-2",
				VariantKey: "readability_full_text",
				TextValue:  "Full article content here with extensive details...",
			},
		},
	}

	diff := &models.EntryDiff{
		VariantsAdded: []string{"readability_full_text"},
	}

	// Rule: trigger AI summary when readability_full_text became_present AND ai_summary is empty
	aiRule := models.Rule{
		ID:        "r-ai",
		Name:      "AI summary on full text added",
		MatchMode: "all",
		Conditions: []models.RuleCondition{
			{Field: "variants.readability_full_text", Operator: "became_present"},
			{Field: "variants.ai_summary", Operator: "is_empty"},
		},
	}

	// Should match when full text was added
	if !eval.EvaluateTransition(aiRule, &oldEntry, &newEntryWithFullText, diff) {
		t.Error("expected aiRule to match when readability_full_text became_present")
	}

	// Should NOT match if tag was added instead of full text
	diffOnlyTags := &models.EntryDiff{
		FieldsChanged: []string{"metadata.tags"},
	}
	if eval.EvaluateTransition(aiRule, &oldEntry, &oldEntry, diffOnlyTags) {
		t.Error("expected aiRule to NOT match when only tags changed")
	}

	// Test word count condition for TTS: word_count >= 5
	ttsRule := models.Rule{
		ID:        "r-tts",
		Name:      "TTS on long summary",
		MatchMode: "all",
		Conditions: []models.RuleCondition{
			{Field: "variants.readability_full_text.word_count", Operator: ">=", Value: 5},
		},
	}

	if !eval.EvaluateTransition(ttsRule, &oldEntry, &newEntryWithFullText, diff) {
		t.Error("expected ttsRule to match when word_count >= 5")
	}
}