package freedoc_test

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"chat-agent-system/internal/docrevision"
	"chat-agent-system/internal/freedoc"
)

func TestCreateDocument_ClientKeyIdempotentAndBootstrapsLedger(t *testing.T) {
	ctx := context.Background()
	rev := docrevision.NewService(nil)
	svc := freedoc.NewService(nil, nil)
	svc.SetDocRevision(rev)

	detail, err := svc.CreateDocument(ctx, 42, freedoc.CreateFreeformDocRequest{
		ProjectID:       7,
		Title:           "超声探头规格.pdf",
		ContentMarkdown: "# 超声探头规格\n\n上传正文基线\n",
		Space:           "my_private",
		ClientKey:       "doc-upload-1789263145197-0",
	})
	require.NoError(t, err)
	require.NotNil(t, detail)
	assert.True(t, len(detail.Document.DocID) > 0)
	assert.True(t, detail.Document.DocID[:8] == "doc-free" || detail.Document.DocID[:9] == "doc-free-")
	require.NotNil(t, detail.Document.ClientKey)
	assert.Equal(t, "doc-upload-1789263145197-0", *detail.Document.ClientKey)
	assert.Equal(t, "freeform", detail.Document.GovernanceMode)
	// source_content_sha256 must remain content fingerprint — never client_key prefix
	assert.NotContains(t, detail.Document.SourceContentSHA256, "doc-upload")
	assert.NotContains(t, detail.Document.SourceContentSHA256, "client_key")
	assert.Len(t, detail.Document.SourceContentSHA256, 64)

	st, err := rev.GetRevisionState(ctx, detail.Document.DocID)
	require.NoError(t, err)
	assert.GreaterOrEqual(t, st.CurrentVersionNo, 1)

	again, err := svc.CreateDocument(ctx, 42, freedoc.CreateFreeformDocRequest{
		ProjectID:       7,
		Title:           "超声探头规格.pdf",
		ContentMarkdown: "# 超声探头规格\n\n上传正文基线\n",
		ClientKey:       "doc-upload-1789263145197-0",
	})
	require.NoError(t, err)
	assert.Equal(t, detail.Document.DocID, again.Document.DocID)

	otherUser, err := svc.CreateDocument(ctx, 99, freedoc.CreateFreeformDocRequest{
		ProjectID:       7,
		Title:           "他人同名键",
		ContentMarkdown: "# other\n",
		ClientKey:       "doc-upload-1789263145197-0",
	})
	require.NoError(t, err)
	assert.NotEqual(t, detail.Document.DocID, otherUser.Document.DocID)
}

func TestCreateDocument_AcceptsSnowflakeProjectID(t *testing.T) {
	// projects.id is BIGINT; freeform must accept IDs above int4 max (regression: int4 encode 500).
	const snowflakeProjectID int64 = 1789095399489
	svc := freedoc.NewService(nil, nil)
	detail, err := svc.CreateDocument(context.Background(), 42, freedoc.CreateFreeformDocRequest{
		ProjectID:       snowflakeProjectID,
		Title:           "snowflake.pdf",
		ContentMarkdown: "# snowflake\n",
		Space:           "my_private",
	})
	require.NoError(t, err)
	assert.Equal(t, snowflakeProjectID, detail.Document.ProjectID)

	list, err := svc.ListDocuments(context.Background(), 42, snowflakeProjectID, "my_private")
	require.NoError(t, err)
	require.Len(t, list, 1)
	assert.Equal(t, snowflakeProjectID, list[0].ProjectID)
}

func TestCreateDocument_RejectsEmptyContent(t *testing.T) {
	svc := freedoc.NewService(nil, nil)
	_, err := svc.CreateDocument(context.Background(), 1, freedoc.CreateFreeformDocRequest{
		ProjectID: 1, Title: "x", ContentMarkdown: "   ",
	})
	assert.ErrorIs(t, err, freedoc.ErrInvalidParam)
}

func TestCreateDocument_RequiresProjectIDAndPrivateSpace(t *testing.T) {
	svc := freedoc.NewService(nil, nil)
	_, err := svc.CreateDocument(context.Background(), 1, freedoc.CreateFreeformDocRequest{
		ProjectID: 0, Title: "x", ContentMarkdown: "# x\n",
	})
	assert.ErrorIs(t, err, freedoc.ErrInvalidParam)
	assert.Contains(t, err.Error(), "project_id")

	_, err = svc.CreateDocument(context.Background(), 1, freedoc.CreateFreeformDocRequest{
		ProjectID: 1, Title: "x", ContentMarkdown: "# x\n", Space: "project_shared",
	})
	assert.ErrorIs(t, err, freedoc.ErrInvalidParam)
	assert.Contains(t, err.Error(), "my_private")
}

func TestCreateDocument_PersistsSourceFileMetadata(t *testing.T) {
	ctx := context.Background()
	svc := freedoc.NewService(nil, nil)

	detail, err := svc.CreateDocument(ctx, 42, freedoc.CreateFreeformDocRequest{
		ProjectID:       7,
		Title:           "upload-note",
		ContentMarkdown: "# upload-note\n\n临床需求摘要占位\n",
		Space:           "my_private",
		ClientKey:       "doc-upload-meta-1",
		SourceFilename:  "upload-note.txt",
		SourceMimeType:  "text/plain",
		SourceSizeBytes: 41,
		SourceAssetID:   501,
	})
	require.NoError(t, err)
	require.NotNil(t, detail)
	assert.Equal(t, "upload-note.txt", detail.Document.SourceFilename)
	assert.Equal(t, "text/plain", detail.Document.SourceMimeType)
	assert.EqualValues(t, 41, detail.Document.SourceSizeBytes)
	assert.EqualValues(t, 501, detail.Document.SourceAssetID)

	// 列表概要同样带出上传元数据（前端跨端恢复预览路由的事实源）。
	list, err := svc.ListDocuments(ctx, 42, 7, "my_private")
	require.NoError(t, err)
	require.Len(t, list, 1)
	assert.Equal(t, "upload-note.txt", list[0].SourceFilename)
	assert.EqualValues(t, 41, list[0].SourceSizeBytes)
	assert.EqualValues(t, 501, list[0].SourceAssetID)

	// 非上传文档元数据恒为零值，不影响既有编辑器路径。
	plain, err := svc.CreateDocument(ctx, 42, freedoc.CreateFreeformDocRequest{
		ProjectID:       7,
		Title:           "plain-note",
		ContentMarkdown: "# plain\n",
		ClientKey:       "doc-upload-meta-2",
	})
	require.NoError(t, err)
	assert.Empty(t, plain.Document.SourceFilename)
	assert.EqualValues(t, 0, plain.Document.SourceSizeBytes)
}

func TestCreateDocument_RejectsNegativeSourceMetadata(t *testing.T) {
	ctx := context.Background()
	svc := freedoc.NewService(nil, nil)
	_, err := svc.CreateDocument(ctx, 42, freedoc.CreateFreeformDocRequest{
		ProjectID:       7,
		Title:           "bad",
		ContentMarkdown: "# bad\n",
		SourceSizeBytes: -1,
	})
	assert.ErrorIs(t, err, freedoc.ErrInvalidParam)
	_, err = svc.CreateDocument(ctx, 42, freedoc.CreateFreeformDocRequest{
		ProjectID:       7,
		Title:           "bad",
		ContentMarkdown: "# bad\n",
		SourceAssetID:   -5,
	})
	assert.ErrorIs(t, err, freedoc.ErrInvalidParam)
}