package queryapi

import (
	"net/http"
	"time"

	"queryorchestration/internal/database/repository"

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

// CreateFolder creates a new folder for organizing documents.
// POST /folders
// Takes a FolderCreate request body containing path, clientId, parentId (optional), and createdBy.
// Returns the created Folder on success, or an error response.
func (s *Controllers) CreateFolder(ctx echo.Context) error {
	var req CreateFolderJSONRequestBody
	if err := ctx.Bind(&req); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid request body")
	}

	// Validate required fields
	if req.Path == "" {
		return echo.NewHTTPError(http.StatusBadRequest, "path is required")
	}
	if req.ClientId == "" {
		return echo.NewHTTPError(http.StatusBadRequest, "clientId is required")
	}
	if req.CreatedBy == "" {
		return echo.NewHTTPError(http.StatusBadRequest, "createdBy is required")
	}

	// Convert parent ID if provided
	var parentID *uuid.UUID
	if req.ParentId != nil {
		id := uuid.UUID(*req.ParentId)
		parentID = &id
	}

	folder, err := s.svc.Folder.CreateFolder(ctx.Request().Context(), req.Path, parentID, string(req.ClientId), string(req.CreatedBy))
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return ctx.JSON(http.StatusCreated, convertRepoFolderToAPI(folder))
}

// RenameFolder updates the path of an existing folder.
// PATCH /folders/{folderId}
// Takes a FolderRename request body containing the new path.
// Returns 204 No Content on success, or an error response.
func (s *Controllers) RenameFolder(ctx echo.Context, folderId openapi_types.UUID) error {
	var req RenameFolderJSONRequestBody
	if err := ctx.Bind(&req); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid request body")
	}

	if req.Path == "" {
		return echo.NewHTTPError(http.StatusBadRequest, "path is required")
	}

	err := s.svc.Folder.RenameFolder(ctx.Request().Context(), uuid.UUID(folderId), req.Path)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return ctx.NoContent(http.StatusNoContent)
}

// GetFolderDocuments retrieves all documents in a specific folder.
// GET /folders/{folderId}/documents
// Returns a list of documents in the specified folder.
func (s *Controllers) GetFolderDocuments(ctx echo.Context, folderId openapi_types.UUID) error {
	documents, err := s.svc.Folder.GetDocumentsByFolder(ctx.Request().Context(), uuid.UUID(folderId))
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	// Convert to API response format
	apiDocs := make([]DocumentSummary, len(documents))
	for i, doc := range documents {
		apiDocs[i] = DocumentSummary{
			Hash: doc.Hash,
			Id:   openapi_types.UUID(doc.ID),
		}
	}

	return ctx.JSON(http.StatusOK, map[string]interface{}{
		"documents": apiDocs,
	})
}

// ListClientFolders retrieves all folders for a client.
// GET /client/{id}/folders
// Returns a FolderList containing all folders for the client.
// Each folder includes its ID, path, and parentId, allowing clients to reconstruct the folder hierarchy.
// Root-level folders will have parentId set to null.
func (s *Controllers) ListClientFolders(ctx echo.Context, id ClientID) error {
	folders, err := s.svc.Folder.GetFoldersByClient(ctx.Request().Context(), string(id))
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	// Convert repository folders to API folders
	apiFolders := make([]Folder, len(folders))
	for i, f := range folders {
		apiFolders[i] = convertRepoFolderToAPI(f)
	}

	return ctx.JSON(http.StatusOK, FolderList{
		Folders: apiFolders,
	})
}

// GetFolderMetrics retrieves processing metrics for a folder including document counts by label.
// GET /folders/{folderId}/metrics
// Returns FolderMetrics containing total document count and breakdown by label.
func (s *Controllers) GetFolderMetrics(ctx echo.Context, folderId openapi_types.UUID) error {
	metrics, err := s.svc.Folder.GetFolderMetrics(ctx.Request().Context(), uuid.UUID(folderId))
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return ctx.JSON(http.StatusOK, FolderMetrics{
		FolderId:       folderId,
		TotalDocuments: metrics.TotalDocuments,
		ByLabel:        metrics.ByLabel,
	})
}

// convertRepoFolderToAPI converts a repository Folder to the API Folder type.
func convertRepoFolderToAPI(folder *repository.Folder) Folder {
	var createdAt time.Time
	if folder.Createdat.Valid {
		createdAt = folder.Createdat.Time
	}

	result := Folder{
		Id:        openapi_types.UUID(folder.ID),
		Path:      folder.Path,
		ClientId:  ClientID(folder.Clientid),
		CreatedBy: openapi_types.Email(folder.Createdby),
		CreatedAt: createdAt,
	}

	if folder.Parentid != nil {
		result.ParentId = nullable.NewNullableWithValue(openapi_types.UUID(*folder.Parentid))
	}

	return result
}