package document_test

import (
	"errors"
	"testing"

	"queryorchestration/internal/database/repository"
	"queryorchestration/internal/document"
	"queryorchestration/internal/fieldextraction"
	"queryorchestration/internal/harddelete"
	"queryorchestration/internal/test"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// createTestDocumentWithDeps creates a document with entries, cleans, and field extractions.
// Returns the document ID for use in delete tests.
func createTestDocumentWithDeps(t *testing.T, cfg *TestConfig, clientID string, folderID *uuid.UUID, hash string) uuid.UUID {
	t.Helper()
	ctx := t.Context()
	q := cfg.GetDBQueries()

	filename := hash + ".pdf"
	docID, err := q.CreateDocument(ctx, &repository.CreateDocumentParams{
		Clientid: clientID,
		Hash:     hash,
		Filename: &filename,
		Folderid: folderID,
	})
	require.NoError(t, err)

	// Add a document entry (S3 reference)
	err = q.AddDocumentEntry(ctx, &repository.AddDocumentEntryParams{
		Documentid: docID,
		Bucket:     "test-bucket",
		Key:        "test-key/" + hash,
	})
	require.NoError(t, err)

	// Add a document clean (must satisfy location_xor_fail constraint)
	cleanBucket := "clean-bucket"
	cleanKey := "clean-key/" + hash
	cleanHash := "cleanhash-" + hash
	cleanID, err := q.AddDocumentClean(ctx, &repository.AddDocumentCleanParams{
		Documentid: docID,
		Bucket:     &cleanBucket,
		Key:        &cleanKey,
		Hash:       &cleanHash,
		Mimetype: repository.NullCleanmimetype{
			Cleanmimetype: repository.CleanmimetypeApplicationPdf,
			Valid:         true,
		},
	})
	require.NoError(t, err)

	// Add a clean entry
	err = q.AddDocumentCleanEntry(ctx, &repository.AddDocumentCleanEntryParams{
		Cleanid: cleanID,
		Version: 1,
	})
	require.NoError(t, err)

	// Add field extraction
	fieldSvc := fieldextraction.New(cfg)
	contractTitle := "Test Contract " + hash
	input := &fieldextraction.CreateFieldExtractionInput{
		DocumentID: docID,
		SingleFields: &repository.AddFieldExtractionParams{
			Documentid:    docID,
			Filename:      &filename,
			Contracttitle: &contractTitle,
			Createdby:     "testuser",
		},
		ArrayFields: []*repository.AddFieldExtractionArrayFieldParams{},
	}
	_, err = fieldSvc.CreateFieldExtraction(ctx, input)
	require.NoError(t, err)

	return docID
}

func TestHardDeleteDocument(t *testing.T) {
	ctx := t.Context()
	cfg := &TestConfig{}
	test.CreateDB(t, cfg)

	clientID := "test-doc-delete"
	test.CreateTestClient(t, cfg, clientID, "Test Doc Delete")

	svc := document.New(cfg)

	t.Run("deletes document and all dependent rows", func(t *testing.T) {
		q := cfg.GetDBQueries()

		rootFolder, err := q.GetFolderByPath(ctx, &repository.GetFolderByPathParams{
			Clientid: clientID,
			Path:     "/",
		})
		require.NoError(t, err)

		docID := createTestDocumentWithDeps(t, cfg, clientID, &rootFolder.ID, "delete-cascade-test")

		// Verify document and deps exist before delete
		_, err = q.GetDocumentSummary(ctx, docID)
		require.NoError(t, err)

		s3Rows, err := q.CollectDocumentS3Paths(ctx, docID)
		require.NoError(t, err)
		assert.Len(t, s3Rows, 1)

		// Delete the document
		s3Paths, err := svc.HardDelete(ctx, docID)
		require.NoError(t, err)

		// Verify S3 paths returned
		assert.Len(t, s3Paths, 1)
		assert.Equal(t, "test-bucket", s3Paths[0].Bucket)
		assert.Equal(t, "test-key/delete-cascade-test", s3Paths[0].Key)
		assert.Equal(t, docID, s3Paths[0].DocumentID)

		// Verify document is gone
		_, err = q.GetDocumentSummary(ctx, docID)
		require.Error(t, err)

		// Verify document entries are gone
		s3Rows, err = q.CollectDocumentS3Paths(ctx, docID)
		require.NoError(t, err)
		assert.Empty(t, s3Rows)

		// Verify field extractions are gone
		extractions, err := q.GetFieldExtractionsByDocumentID(ctx, docID)
		require.NoError(t, err)
		assert.Empty(t, extractions)
	})

	t.Run("returns NotFoundError for non-existent document", func(t *testing.T) {
		fakeID := uuid.New()
		_, err := svc.HardDelete(ctx, fakeID)
		require.Error(t, err)

		var notFoundErr *harddelete.NotFoundError
		assert.True(t, errors.As(err, &notFoundErr))
	})

	t.Run("deletes document that has batch outcome rows", func(t *testing.T) {
		q := cfg.GetDBQueries()

		// Use a unique client to avoid collisions with other subtests
		batchClientID := "test-doc-batch-del"
		test.CreateTestClient(t, cfg, batchClientID, "Test Doc Batch Del")

		rootFolder, err := q.GetFolderByPath(ctx, &repository.GetFolderByPathParams{
			Clientid: batchClientID,
			Path:     "/",
		})
		require.NoError(t, err)

		// Create a batch upload for the client
		batchID, err := q.CreateBatchUpload(ctx, &repository.CreateBatchUploadParams{
			ClientID:         batchClientID,
			OriginalFilename: "test.zip",
			TotalDocuments:   1,
		})
		require.NoError(t, err)

		// Create a document linked to the batch
		filename := "test.pdf"
		docID, err := q.CreateDocument(ctx, &repository.CreateDocumentParams{
			Clientid: batchClientID,
			Hash:     "batch-doc-del-test",
			Filename: &filename,
			Folderid: &rootFolder.ID,
			BatchID:  &batchID,
		})
		require.NoError(t, err)

		// Insert a submitted outcome referencing this document
		err = q.InsertBatchDocumentOutcome(ctx, &repository.InsertBatchDocumentOutcomeParams{
			BatchID:    batchID,
			Filename:   "test.pdf",
			Column3:    repository.BatchOutcomeStatusSubmitted,
			DocumentID: &docID,
		})
		require.NoError(t, err)

		// Hard delete the document -- should fail before FK fix
		s3Paths, err := svc.HardDelete(ctx, docID)
		require.NoError(t, err)

		// Verify document is gone
		_ = s3Paths
		_, err = q.GetDocumentSummary(ctx, docID)
		require.Error(t, err)

		// Verify the batch outcome row still exists but document_id is NULL
		// (history preserved via SET NULL on FK)
		rows, err := q.ListBatchDocumentOutcomes(ctx, batchID)
		require.NoError(t, err)
		require.Len(t, rows, 1)
		assert.Nil(t, rows[0].DocumentID)
	})

	t.Run("returns empty S3 paths when document has no entries", func(t *testing.T) {
		q := cfg.GetDBQueries()

		// Create a document with no entries
		docID, err := q.CreateDocument(ctx, &repository.CreateDocumentParams{
			Clientid: clientID,
			Hash:     "no-entries-test",
		})
		require.NoError(t, err)

		s3Paths, err := svc.HardDelete(ctx, docID)
		require.NoError(t, err)
		assert.Empty(t, s3Paths)
	})
}