package httpx

import (
	"encoding/json"
	"errors"
	"io"
	"net/http"
	"strings"

	bootstrapservice "moku-backend/internal/bootstrap"

	"github.com/go-chi/chi/v5"
)

type createProjectFolderRequest struct {
	Name           string `json:"name"`
	ParentFolderID string `json:"parentFolderId"`
}

type renameProjectFolderRequest struct {
	FolderID string `json:"folderId"`
	Name     string `json:"name"`
}

type deleteProjectFolderRequest struct {
	FolderID string `json:"folderId"`
}

type moveProjectFolderRequest struct {
	FolderID       string `json:"folderId"`
	ParentFolderID string `json:"parentFolderId"`
}

func (routes apiRoutes) handleProjectFolders(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	folders, err := routes.bootstrapService().GetProjectHierarchyFolders(r.Context(), projectID)
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "load")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": map[string]any{
			"projectId": projectID,
			"folders":   folders,
		},
		"meta": map[string]any{
			"resource": "project-folders",
		},
	})
}

func (routes apiRoutes) handleCreateProjectFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload, ok := decodeProjectFolderRequest(w, r)
	if !ok {
		return
	}

	payload.Name = strings.TrimSpace(payload.Name)
	payload.ParentFolderID = strings.TrimSpace(payload.ParentFolderID)
	if payload.Name == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder name is required.")
		return
	}

	result, err := routes.bootstrapService().CreateProjectFolder(r.Context(), bootstrapservice.CreateProjectFolderInput{
		ProjectID:      projectID,
		ParentFolderID: payload.ParentFolderID,
		Name:           payload.Name,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "persist")
		return
	}

	WriteJSON(w, http.StatusCreated, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-folder-create",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) handleDeleteProjectFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload := decodeDeleteProjectFolderRequest(r)
	if strings.TrimSpace(payload.FolderID) == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder ID is required.")
		return
	}

	result, err := routes.bootstrapService().DeleteProjectFolder(r.Context(), bootstrapservice.DeleteProjectFolderInput{
		ProjectID: projectID,
		FolderID:  payload.FolderID,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "delete")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-folder-delete",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) handleRenameProjectFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload, ok := decodeRenameProjectFolderRequest(w, r)
	if !ok {
		return
	}

	payload.FolderID = strings.TrimSpace(payload.FolderID)
	payload.Name = strings.TrimSpace(payload.Name)
	if payload.FolderID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder ID is required.")
		return
	}
	if payload.Name == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder name is required.")
		return
	}

	result, err := routes.bootstrapService().RenameProjectFolder(r.Context(), bootstrapservice.RenameProjectFolderInput{
		ProjectID: projectID,
		FolderID:  payload.FolderID,
		Name:      payload.Name,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "rename")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-folder-rename",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) handleMoveProjectFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload, ok := decodeMoveProjectFolderRequest(w, r)
	if !ok {
		return
	}

	payload.FolderID = strings.TrimSpace(payload.FolderID)
	payload.ParentFolderID = strings.TrimSpace(payload.ParentFolderID)
	if payload.FolderID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder ID is required.")
		return
	}

	result, err := routes.bootstrapService().MoveProjectFolder(r.Context(), bootstrapservice.MoveProjectFolderInput{
		ProjectID:      projectID,
		FolderID:       payload.FolderID,
		ParentFolderID: payload.ParentFolderID,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "move")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-folder-move",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) handleProjectTreeFolders(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	folders, err := routes.bootstrapService().GetProjectTreeFolders(r.Context(), projectID)
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "load")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": map[string]any{
			"projectId": projectID,
			"folders":   folders,
		},
		"meta": map[string]any{
			"resource": "project-tree-folders",
		},
	})
}

func (routes apiRoutes) handleCreateProjectTreeFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload, ok := decodeProjectFolderRequest(w, r)
	if !ok {
		return
	}

	payload.Name = strings.TrimSpace(payload.Name)
	payload.ParentFolderID = strings.TrimSpace(payload.ParentFolderID)
	if payload.Name == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder name is required.")
		return
	}

	result, err := routes.bootstrapService().CreateProjectTreeFolder(r.Context(), bootstrapservice.CreateProjectFolderInput{
		ProjectID:      projectID,
		ParentFolderID: payload.ParentFolderID,
		Name:           payload.Name,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "persist")
		return
	}

	WriteJSON(w, http.StatusCreated, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-tree-folder-create",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) handleDeleteProjectTreeFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload := decodeDeleteProjectFolderRequest(r)
	if strings.TrimSpace(payload.FolderID) == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder ID is required.")
		return
	}

	result, err := routes.bootstrapService().DeleteProjectTreeFolder(r.Context(), bootstrapservice.DeleteProjectFolderInput{
		ProjectID: projectID,
		FolderID:  payload.FolderID,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "delete")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-tree-folder-delete",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) handleRenameProjectTreeFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload, ok := decodeRenameProjectFolderRequest(w, r)
	if !ok {
		return
	}

	payload.FolderID = strings.TrimSpace(payload.FolderID)
	payload.Name = strings.TrimSpace(payload.Name)
	if payload.FolderID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder ID is required.")
		return
	}
	if payload.Name == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder name is required.")
		return
	}

	result, err := routes.bootstrapService().RenameProjectTreeFolder(r.Context(), bootstrapservice.RenameProjectFolderInput{
		ProjectID: projectID,
		FolderID:  payload.FolderID,
		Name:      payload.Name,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "rename")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-tree-folder-rename",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) handleMoveProjectTreeFolder(w http.ResponseWriter, r *http.Request) {
	projectID := strings.TrimSpace(chi.URLParam(r, "projectId"))
	if projectID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project ID is required.")
		return
	}

	payload, ok := decodeMoveProjectFolderRequest(w, r)
	if !ok {
		return
	}

	payload.FolderID = strings.TrimSpace(payload.FolderID)
	payload.ParentFolderID = strings.TrimSpace(payload.ParentFolderID)
	if payload.FolderID == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Folder ID is required.")
		return
	}

	result, err := routes.bootstrapService().MoveProjectTreeFolder(r.Context(), bootstrapservice.MoveProjectFolderInput{
		ProjectID:      projectID,
		FolderID:       payload.FolderID,
		ParentFolderID: payload.ParentFolderID,
	})
	if err != nil {
		routes.writeProjectFolderError(w, r, err, "move")
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": result,
		"meta": map[string]any{
			"resource":  "project-tree-folder-move",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) writeProjectFolderError(w http.ResponseWriter, r *http.Request, err error, operation string) {
	switch {
	case errors.Is(err, bootstrapservice.ErrProjectNotFound), errors.Is(err, bootstrapservice.ErrProjectFolderNotFound):
		WriteError(w, http.StatusNotFound, RequestIDFromContext(r.Context()), "not_found", err.Error())
	case errors.Is(err, bootstrapservice.ErrInvalidProjectFolderMove):
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", err.Error())
	default:
		routes.cfg.Logger.Error(operation+" project folder", "error", err, "path", r.URL.Path)
		message := "Failed to " + operation + " project folder."
		if routes.cfg.Config.IsDevelopment() {
			message = message + " " + err.Error()
		}
		WriteError(w, http.StatusInternalServerError, RequestIDFromContext(r.Context()), "project_folder_"+operation+"_failed", message)
	}
}

func decodeMoveProjectFolderRequest(w http.ResponseWriter, r *http.Request) (moveProjectFolderRequest, bool) {
	var payload moveProjectFolderRequest

	decoder := json.NewDecoder(r.Body)
	decoder.DisallowUnknownFields()

	if err := decoder.Decode(&payload); err != nil {
		if errors.Is(err, io.EOF) {
			WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body is required and must be valid JSON.")
			return payload, false
		}

		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body must be valid JSON.")
		return payload, false
	}

	if err := decoder.Decode(&struct{}{}); !errors.Is(err, io.EOF) {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body must contain a single JSON object.")
		return payload, false
	}

	return payload, true
}

func decodeDeleteProjectFolderRequest(r *http.Request) deleteProjectFolderRequest {
	return deleteProjectFolderRequest{
		FolderID: strings.TrimSpace(r.URL.Query().Get("folderId")),
	}
}

func decodeRenameProjectFolderRequest(w http.ResponseWriter, r *http.Request) (renameProjectFolderRequest, bool) {
	var payload renameProjectFolderRequest

	decoder := json.NewDecoder(r.Body)
	decoder.DisallowUnknownFields()

	if err := decoder.Decode(&payload); err != nil {
		if errors.Is(err, io.EOF) {
			WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body is required and must be valid JSON.")
			return payload, false
		}

		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body must be valid JSON.")
		return payload, false
	}

	if err := decoder.Decode(&struct{}{}); !errors.Is(err, io.EOF) {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body must contain a single JSON object.")
		return payload, false
	}

	return payload, true
}

func decodeProjectFolderRequest(w http.ResponseWriter, r *http.Request) (createProjectFolderRequest, bool) {
	var payload createProjectFolderRequest

	decoder := json.NewDecoder(r.Body)
	decoder.DisallowUnknownFields()

	if err := decoder.Decode(&payload); err != nil {
		if errors.Is(err, io.EOF) {
			WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body is required and must be valid JSON.")
			return payload, false
		}

		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body must be valid JSON.")
		return payload, false
	}

	if err := decoder.Decode(&struct{}{}); !errors.Is(err, io.EOF) {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body must contain a single JSON object.")
		return payload, false
	}

	return payload, true
}