package chatpipeline

import (
	"context"
	"testing"

	"github.com/Tencent/WeKnora/internal/config"
	"github.com/Tencent/WeKnora/internal/types"
	"github.com/Tencent/WeKnora/internal/types/interfaces"
	"github.com/stretchr/testify/require"
)

// Phase two's claim is that memory changes what gets retrieved, not only what
// the answer prompt says. These tests hold the two places that has to be true:
// the query the retriever is given, and the order documents come back in.

type stubRetrievalMemory struct {
	stubMemoryService

	retrieval interfaces.RetrievalContext
	affinity  map[string]int
	askedFor  []string
}

func (s *stubRetrievalMemory) RetrievalContextFor(context.Context) interfaces.RetrievalContext {
	return s.retrieval
}

func (s *stubRetrievalMemory) DocumentAffinity(_ context.Context, ids []string) map[string]int {
	s.askedFor = ids
	return s.affinity
}

func TestWhoIsAskingReachesTheQueryRewriter(t *testing.T) {
	memoryService := &stubRetrievalMemory{
		retrieval: interfaces.RetrievalContext{
			Background: "在做医学影像的后端",
			Interests:  []string{"医学影像分割"},
			Documents:  []string{"分割模型调参手册"},
			Items: []*types.MemoryItem{
				{ID: "m1", Kind: types.MemoryKindProfile, Content: "在做医学影像的后端"},
			},
		},
	}
	plugin := &PluginQueryUnderstand{
		memoryService: memoryService,
		config: &config.Config{Conversation: &config.ConversationConfig{
			RewritePromptSystem: "改写用户的问题。",
			RewritePromptUser:   "{{query}}",
		}},
	}

	chatManage := &types.ChatManage{}
	chatManage.Query = "分割怎么调参"

	_, userPrompt := plugin.buildPrompts(t.Context(), chatManage, nil)

	require.Contains(t, userPrompt, "在做医学影像的后端",
		"the same question means different things to different people, and only "+
			"the rewriter can act on that before retrieval runs")
	require.Contains(t, userPrompt, "医学影像分割")
	require.Contains(t, userPrompt, "分割模型调参手册")
	require.Contains(t, userPrompt, "分割怎么调参", "the question itself must survive")

	// Conditioning the rewriter is not a recall. The background is fed in
	// whole, relevant or not, so counting it as "memories this answer used"
	// would report unrelated memories on every single turn. That list is
	// MEMORY_RECALL's to build, from what the question actually matched.
	require.Empty(t, chatManage.UsedMemories)
}

func TestQueryRewriterIsUnchangedWithoutMemory(t *testing.T) {
	plugin := &PluginQueryUnderstand{
		memoryService: &stubRetrievalMemory{},
		config: &config.Config{Conversation: &config.ConversationConfig{
			RewritePromptSystem: "改写用户的问题。",
			RewritePromptUser:   "{{query}}",
		}},
	}
	chatManage := &types.ChatManage{}
	chatManage.Query = "分割怎么调参"

	_, userPrompt := plugin.buildPrompts(t.Context(), chatManage, nil)
	require.NotContains(t, userPrompt, "asker_background")
	require.Empty(t, chatManage.UsedMemories)
}

func TestFamiliarDocumentsRankHigher(t *testing.T) {
	memoryService := &stubRetrievalMemory{affinity: map[string]int{"doc-familiar": 8}}
	plugin := &PluginMemoryAffinity{memoryService: memoryService}

	chatManage := &types.ChatManage{
		PipelineState: types.PipelineState{RerankResult: []*types.SearchResult{
			{ID: "c1", KnowledgeID: "doc-stranger", Score: 0.80},
			{ID: "c2", KnowledgeID: "doc-familiar", Score: 0.78},
		}},
	}

	err := plugin.OnEvent(t.Context(), types.CHUNK_RERANK, chatManage, func() *PluginError {
		return nil
	})
	require.Nil(t, err)
	require.Equal(t, "c2", chatManage.RerankResult[0].ID,
		"between two comparable passages, prefer the document this person works from")
}

func TestAnUnrelatedDocumentIsNotDraggedToTheTop(t *testing.T) {
	// The signal is weak — it says the retriever kept picking a document, not
	// that the user found it useful — so it must never overturn a clear
	// relevance gap.
	memoryService := &stubRetrievalMemory{affinity: map[string]int{"doc-familiar": 1000}}
	plugin := &PluginMemoryAffinity{memoryService: memoryService}

	chatManage := &types.ChatManage{
		PipelineState: types.PipelineState{RerankResult: []*types.SearchResult{
			{ID: "c1", KnowledgeID: "doc-relevant", Score: 0.90},
			{ID: "c2", KnowledgeID: "doc-familiar", Score: 0.40},
		}},
	}

	err := plugin.OnEvent(t.Context(), types.CHUNK_RERANK, chatManage, func() *PluginError {
		return nil
	})
	require.Nil(t, err)
	require.Equal(t, "c1", chatManage.RerankResult[0].ID)
}

func TestRerankIsUntouchedWithoutAffinity(t *testing.T) {
	plugin := &PluginMemoryAffinity{memoryService: &stubRetrievalMemory{}}
	chatManage := &types.ChatManage{
		PipelineState: types.PipelineState{RerankResult: []*types.SearchResult{
			{ID: "c1", KnowledgeID: "doc-a", Score: 0.80},
			{ID: "c2", KnowledgeID: "doc-b", Score: 0.78},
		}},
	}
	err := plugin.OnEvent(t.Context(), types.CHUNK_RERANK, chatManage, func() *PluginError {
		return nil
	})
	require.Nil(t, err)
	require.Equal(t, 0.80, chatManage.RerankResult[0].Score)
	require.Equal(t, 0.78, chatManage.RerankResult[1].Score)
}