package queryapi

import (
	"fmt"
	"log/slog"
	"net/http"

	"queryorchestration/internal/document/batch/storage"
	documentupload "queryorchestration/internal/document/upload"

	"github.com/google/uuid"
	"github.com/labstack/echo/v4"
	"github.com/oapi-codegen/nullable"
)

func (s *Controllers) UploadDocument(ctx echo.Context, clientId ClientID) error {
	form, err := ctx.MultipartForm()
	if err != nil {
		slog.Error("unable to get form data", "error", err)
		return echo.NewHTTPError(http.StatusBadRequest, "unable to get form data")
	}

	files := form.File["file"]
	if len(files) == 0 {
		return echo.NewHTTPError(http.StatusBadRequest, "missing file")
	} else if len(files) > 1 {
		return echo.NewHTTPError(http.StatusBadRequest, "too many files")
	}
	file := files[0]

	src, err := file.Open()
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "unable to read file")
	}
	defer src.Close()

	err = s.svc.DocumentUpload.Upload(ctx.Request().Context(), documentupload.File{
		ClientID: clientId,
		Content:  src,
	})
	if err != nil {
		slog.Error("unable to get form data", "error", err)
		return echo.NewHTTPError(http.StatusBadRequest, "unable to upload file")
	}

	return ctx.NoContent(http.StatusOK)
}

func (s *Controllers) ListDocumentsByClientId(ctx echo.Context, clientId ClientID) error {
	documents, err := s.svc.Document.ListByClient(ctx.Request().Context(), clientId)
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unable to list documents: %s", err))
	}

	docs := make([]DocumentSummary, len(documents))
	for i, doc := range documents {
		docs[i] = DocumentSummary{
			Id:   doc.ID,
			Hash: doc.Hash,
		}
	}

	return ctx.JSON(http.StatusOK, docs)
}

func (s *Controllers) GetDocument(ctx echo.Context, id DocumentID) error {
	document, err := s.svc.Document.GetExternal(ctx.Request().Context(), id)
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unable to list documents: %s", err))
	}

	return ctx.JSON(http.StatusOK, Document{
		Id:       document.Id,
		ClientId: document.ClientID,
		Hash:     document.Hash,
		Fields:   document.Fields,
	})
}

// ListDocumentBatches lists batch uploads for a client
func (s *Controllers) ListDocumentBatches(ctx echo.Context, clientId ClientID, params ListDocumentBatchesParams) error {
	limit := int32(20)
	offset := int32(0)

	if params.Limit != nil {
		limit = *params.Limit
	}
	if params.Offset != nil {
		offset = *params.Offset
	}

	batches, err := s.svc.DocumentBatch.List(ctx.Request().Context(), clientId, limit, offset)
	if err != nil {
		slog.Error("unable to list batches", "error", err)
		return echo.NewHTTPError(http.StatusInternalServerError, "unable to list batches")
	}

	// Convert to API response format
	batchList := BatchUploadList{
		Batches:    make([]BatchUploadSummary, len(batches)),
		TotalCount: int32(len(batches)), // In real implementation, we'd get total count from DB
		// #nosec G115 - len(batches) is bounded by database query limit
	}

	for i, batch := range batches {
		summary := BatchUploadSummary{
			BatchId:              BatchID(batch.ID),
			ClientId:             ClientID(batch.ClientID),
			OriginalFilename:     batch.OriginalFilename,
			Status:               BatchStatus(batch.Status),
			TotalDocuments:       batch.TotalDocuments,
			ProcessedDocuments:   batch.ProcessedDocuments,
			FailedDocuments:      batch.FailedDocuments,
			InvalidTypeDocuments: batch.InvalidTypeDocuments,
			ProgressPercent:      batch.ProgressPercent,
			CreatedAt:            batch.CreatedAt,
		}

		// Handle nullable completed at
		if batch.CompletedAt != nil {
			summary.CompletedAt = nullable.NewNullableWithValue(*batch.CompletedAt)
		}

		batchList.Batches[i] = summary
	}

	return ctx.JSON(http.StatusOK, batchList)
}

// UploadDocumentBatch handles ZIP archive upload containing multiple PDFs
func (s *Controllers) UploadDocumentBatch(ctx echo.Context, clientId ClientID) error {
	// Parse multipart form to get ZIP file
	file, err := ctx.FormFile("archive")
	if err != nil {
		slog.Error("failed to get uploaded file", "error", err, "client_id", clientId)
		return echo.NewHTTPError(http.StatusBadRequest, "file upload required")
	}

	// Open uploaded file
	src, err := file.Open()
	if err != nil {
		slog.Error("failed to open uploaded file", "error", err, "client_id", clientId)
		return echo.NewHTTPError(http.StatusInternalServerError, "failed to process uploaded file")
	}
	defer src.Close()

	// Initialize storage service with objectstore config
	storageService := storage.New(s.cfg)

	// Validate ZIP file
	err = storageService.ValidateZIPFile(file.Filename, file.Size)
	if err != nil {
		slog.Error("ZIP validation failed", "filename", file.Filename, "size", file.Size, "error", err, "client_id", clientId)
		return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("invalid ZIP file: %v", err))
	}

	// Store ZIP file to S3
	storageResult, err := storageService.StoreZIPFile(ctx.Request().Context(), string(clientId), file.Filename, src)
	if err != nil {
		slog.Error("failed to store ZIP file", "error", err, "client_id", clientId)
		return echo.NewHTTPError(http.StatusInternalServerError, "failed to store ZIP file")
	}

	// Create batch record with storage metadata
	// Note: totalDocs is unknown at this point, will be determined during extraction in later parts
	batchID, err := s.svc.DocumentBatch.CreateWithStorage(
		ctx.Request().Context(),
		string(clientId),
		file.Filename,
		0, // totalDocs unknown in Part 1
		storageResult.Bucket,
		storageResult.Key,
		storageResult.SizeBytes,
	)
	if err != nil {
		slog.Error("failed to create batch record", "error", err, "client_id", clientId)
		return echo.NewHTTPError(http.StatusInternalServerError, "failed to create batch record")
	}

	slog.Info("ZIP batch upload completed",
		"batch_id", batchID,
		"filename", file.Filename,
		"size_bytes", storageResult.SizeBytes,
		"s3_key", storageResult.Key,
		"client_id", clientId,
	)

	// Return 202 Accepted with batch ID and status URL
	statusUrl := fmt.Sprintf("/clients/%s/documents/batches/%s", clientId, batchID)
	response := BatchUploadResponse{
		BatchId:   BatchID(batchID),
		Status:    "processing",
		StatusUrl: statusUrl,
	}

	return ctx.JSON(http.StatusAccepted, response)
}

// GetDocumentBatch returns batch upload status
func (s *Controllers) GetDocumentBatch(ctx echo.Context, clientId ClientID, batchId BatchID) error {
	// BatchID is already a UUID type
	batchUUID := uuid.UUID(batchId)

	// Get batch details
	batch, err := s.svc.DocumentBatch.Get(ctx.Request().Context(), clientId, batchUUID)
	if err != nil {
		slog.Error("unable to get batch", "error", err, "batchId", batchId)
		return echo.NewHTTPError(http.StatusNotFound, "batch not found")
	}

	// Convert to API response format
	details := BatchUploadDetails{
		BatchId:              BatchID(batch.ID),
		ClientId:             ClientID(batch.ClientID),
		OriginalFilename:     batch.OriginalFilename,
		Status:               BatchStatus(batch.Status),
		TotalDocuments:       batch.TotalDocuments,
		ProcessedDocuments:   batch.ProcessedDocuments,
		FailedDocuments:      batch.FailedDocuments,
		InvalidTypeDocuments: batch.InvalidTypeDocuments,
		ProgressPercent:      batch.ProgressPercent,
		FailedFilenames:      &batch.FailedFilenames,
		CreatedAt:            batch.CreatedAt,
	}

	// Handle nullable completed at
	if batch.CompletedAt != nil {
		details.CompletedAt = nullable.NewNullableWithValue(*batch.CompletedAt)
	}

	return ctx.JSON(http.StatusOK, details)
}

// CancelDocumentBatch cancels a batch upload in progress
func (s *Controllers) CancelDocumentBatch(ctx echo.Context, clientId ClientID, batchId BatchID) error {
	// BatchID is already a UUID type
	batchUUID := uuid.UUID(batchId)

	// Cancel the batch
	err := s.svc.DocumentBatch.Cancel(ctx.Request().Context(), clientId, batchUUID)
	if err != nil {
		slog.Error("unable to cancel batch", "error", err, "batchId", batchId)
		return echo.NewHTTPError(http.StatusNotFound, "batch not found or cannot be canceled")
	}

	// Return 204 No Content for successful cancellation
	return ctx.NoContent(http.StatusNoContent)
}