package knowledge

import (
	"context"
	"errors"
	"io"
	"log/slog"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/db"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/memory/projectindex"
)

func testLogger() *slog.Logger {
	return slog.New(slog.NewTextHandler(io.Discard, nil))
}

// newTestStore builds a Store backed by an isolated in-memory SQLite project index.
func newTestStore(t *testing.T) *Store {
	t.Helper()
	ctx := context.Background()
	d, err := db.Open(ctx, ":memory:", testLogger())
	if err != nil {
		t.Fatalf("open in-memory db: %v", err)
	}
	t.Cleanup(func() { _ = d.Close() })
	ps, err := projectindex.New(ctx, d, testLogger())
	if err != nil {
		t.Fatalf("projectindex.New: %v", err)
	}
	return New(Deps{Projects: ps, Log: testLogger()})
}

func TestIndexDocumentPersistsProjectAndChapters(t *testing.T) {
	t.Parallel()
	ctx := context.Background()
	s := newTestStore(t)

	doc := Doc{Name: "Cyrene 设计", Desc: "v2 设计文档", Content: "这是项目描述段落。\n\n第二段：内部实现要点。\n第三行补充说明。"}
	if err := s.IndexDocument(ctx, doc); err != nil {
		t.Fatalf("IndexDocument: %v", err)
	}

	docs, err := s.ListDocuments(ctx)
	if err != nil {
		t.Fatalf("ListDocuments: %v", err)
	}
	if len(docs) != 1 {
		t.Fatalf("documents = %d, want 1", len(docs))
	}
	if docs[0].Name != "Cyrene 设计" || docs[0].Desc != "v2 设计文档" {
		t.Fatalf("doc = %+v, want name/desc set", docs[0])
	}
	if docs[0].Chunks != 2 {
		t.Fatalf("chunks = %d, want 2 (two paragraphs)", docs[0].Chunks)
	}

	// The imported content is keyword-searchable via the project index.
	hits, err := s.Search(ctx, "内部实现")
	if err != nil {
		t.Fatalf("Search: %v", err)
	}
	if len(hits) == 0 {
		t.Fatalf("search returned no hits for imported content")
	}
	found := false
	for _, h := range hits {
		if h.DocName == "Cyrene 设计" && h.Chapter == "第 2 节" {
			found = true
			break
		}
	}
	if !found {
		t.Fatalf("hits = %+v, want chapter 第 2 节 under Cyrene 设计", hits)
	}
}

func TestIndexDocumentRejectsBlankNameOrContent(t *testing.T) {
	t.Parallel()
	ctx := context.Background()
	s := newTestStore(t)

	if err := s.IndexDocument(ctx, Doc{Content: "有内容没名字"}); err == nil {
		t.Fatal("IndexDocument with blank name should error")
	}
	if err := s.IndexDocument(ctx, Doc{Name: "有名字没内容"}); err == nil {
		t.Fatal("IndexDocument with blank content should error")
	}
}

func TestIndexDocumentRequiresProjectStore(t *testing.T) {
	t.Parallel()
	ctx := context.Background()
	s := New(Deps{Log: testLogger()}) // projects == nil

	err := s.IndexDocument(ctx, Doc{Name: "x", Content: "y"})
	if err == nil {
		t.Fatal("IndexDocument without a project index should error")
	}
}

func TestDeleteDocumentStillUnsupported(t *testing.T) {
	t.Parallel()
	s := New(Deps{Log: testLogger()})
	if err := s.DeleteDocument(context.Background(), "any"); !errors.Is(err, ErrWriteUnsupported) {
		t.Fatalf("DeleteDocument err = %v, want ErrWriteUnsupported", err)
	}
}