// Path: Backend/internal/httpx/api_bootstrap_routes.go

package httpx

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

	bootstrapservice "moku-backend/internal/bootstrap"
)

type bootstrapInstanceStepRequest struct {
	Protocol string `json:"protocol"`
	Access   string `json:"access"`
	Host     string `json:"host"`
}

type bootstrapModeStepRequest struct {
	Mode string `json:"mode"`
	Name string `json:"name"`
}

type bootstrapAdminStepRequest struct {
	DisplayName string `json:"displayName"`
	Email       string `json:"email"`
	Password    string `json:"password"`
}

type bootstrapStructureStepRequest struct {
	OrganizationName string `json:"organizationName"`
	DepartmentName   string `json:"departmentName"`
	TeamName         string `json:"teamName"`
	ProjectName      string `json:"projectName"`
}

func (routes apiRoutes) handleBootstrapOverview(w http.ResponseWriter, _ *http.Request) {
	WriteJSON(w, http.StatusOK, map[string]any{
		"data": map[string]any{
			"resource": "bootstrap",
			"status":   "persisted",
			"steps": []map[string]string{
				{
					"id":     "instance",
					"method": http.MethodPost,
					"path":   "/v1/bootstrap/steps/instance",
				},
				{
					"id":     "mode",
					"method": http.MethodPost,
					"path":   "/v1/bootstrap/steps/mode",
				},
				{
					"id":     "admin",
					"method": http.MethodPost,
					"path":   "/v1/bootstrap/steps/admin",
				},
				{
					"id":     "structure",
					"method": http.MethodPost,
					"path":   "/v1/bootstrap/steps/structure",
				},
				{
					"id":     "installation",
					"method": http.MethodGet,
					"path":   "/v1/bootstrap/installation",
				},
				{
					"id":     "admin-state",
					"method": http.MethodGet,
					"path":   "/v1/bootstrap/admin",
				},
				{
					"id":     "structure-state",
					"method": http.MethodGet,
					"path":   "/v1/bootstrap/structure",
				},
				{
					"id":     "bootstrap-state",
					"method": http.MethodGet,
					"path":   "/v1/bootstrap/state",
				},
				{
					"id":     "app-shell",
					"method": http.MethodGet,
					"path":   "/v1/app-shell",
				},
			},
		},
	})
}

func (routes apiRoutes) handleBootstrapInstallation(w http.ResponseWriter, r *http.Request) {
	record, err := routes.bootstrapService().GetInstallation(r.Context())
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": record,
		"meta": map[string]any{
			"resource": "bootstrap-installation",
		},
	})
}

func (routes apiRoutes) handleBootstrapAdmin(w http.ResponseWriter, r *http.Request) {
	record, err := routes.bootstrapService().GetAdmin(r.Context())
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": record,
		"meta": map[string]any{
			"resource": "bootstrap-admin",
		},
	})
}

func (routes apiRoutes) handleBootstrapStructure(w http.ResponseWriter, r *http.Request) {
	record, err := routes.bootstrapService().GetStructure(r.Context())
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": record,
		"meta": map[string]any{
			"resource": "bootstrap-structure",
		},
	})
}

func (routes apiRoutes) handleBootstrapState(w http.ResponseWriter, r *http.Request) {
	record, err := routes.bootstrapService().GetState(r.Context())
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": record,
		"meta": map[string]any{
			"resource": "bootstrap-state",
		},
	})
}

func (routes apiRoutes) handleAppShellState(w http.ResponseWriter, r *http.Request) {
	record, err := routes.bootstrapService().GetAppShellState(r.Context())
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": record,
		"meta": map[string]any{
			"resource": "app-shell",
		},
	})
}

func (routes apiRoutes) handleDevelopmentBootstrapReset(w http.ResponseWriter, r *http.Request) {
	if !routes.cfg.Config.IsDevelopment() {
		WriteError(w, http.StatusNotFound, RequestIDFromContext(r.Context()), "not_found", "The requested endpoint does not exist.")
		return
	}

	if err := routes.bootstrapService().ResetDevelopmentState(r.Context()); err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	WriteJSON(w, http.StatusOK, map[string]any{
		"data": map[string]any{
			"reset": true,
		},
		"meta": map[string]any{
			"resource":        "development-bootstrap-reset",
			"developmentOnly": true,
		},
	})
}

func (routes apiRoutes) handleBootstrapInstanceStep(w http.ResponseWriter, r *http.Request) {
	payload, ok := decodeBootstrapRequest[bootstrapInstanceStepRequest](w, r)
	if !ok {
		return
	}
	payload.Protocol = strings.ToLower(strings.TrimSpace(payload.Protocol))
	payload.Access = strings.ToLower(strings.TrimSpace(payload.Access))
	payload.Host = strings.TrimSpace(payload.Host)

	if payload.Protocol != "http" && payload.Protocol != "https" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Protocol must be either 'http' or 'https'.")
		return
	}

	if payload.Access != "local" && payload.Access != "remote" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Access must be either 'local' or 'remote'.")
		return
	}

	if payload.Host == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Host is required.")
		return
	}

	record, err := routes.bootstrapService().SaveInstance(r.Context(), bootstrapservice.SaveInstanceInput{
		Protocol: payload.Protocol,
		Access:   payload.Access,
		Host:     payload.Host,
	})
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	routes.writeBootstrapStepResponse(w, http.StatusOK, "instance", map[string]any{
		"request":      payload,
		"installation": record,
	})
}

func (routes apiRoutes) handleBootstrapModeStep(w http.ResponseWriter, r *http.Request) {
	payload, ok := decodeBootstrapRequest[bootstrapModeStepRequest](w, r)
	if !ok {
		return
	}
	payload.Mode = strings.ToLower(strings.TrimSpace(payload.Mode))
	payload.Name = strings.TrimSpace(payload.Name)

	if payload.Mode != "personal" && payload.Mode != "organizational" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Mode must be either 'personal' or 'organizational'.")
		return
	}

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

	record, err := routes.bootstrapService().SaveMode(r.Context(), bootstrapservice.SaveModeInput{Mode: payload.Mode, Name: payload.Name})
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	routes.writeBootstrapStepResponse(w, http.StatusOK, "mode", map[string]any{
		"request":      payload,
		"installation": record,
	})
}

func (routes apiRoutes) handleBootstrapAdminStep(w http.ResponseWriter, r *http.Request) {
	payload, ok := decodeBootstrapRequest[bootstrapAdminStepRequest](w, r)
	if !ok {
		return
	}
	payload.DisplayName = strings.TrimSpace(payload.DisplayName)
	payload.Email = strings.ToLower(strings.TrimSpace(payload.Email))

	if payload.DisplayName == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Display name is required.")
		return
	}

	if payload.Email == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Email is required.")
		return
	}

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

	record, err := routes.bootstrapService().SaveAdmin(r.Context(), bootstrapservice.SaveAdminInput{
		DisplayName: payload.DisplayName,
		Email:       payload.Email,
		Password:    payload.Password,
	})
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	routes.writeBootstrapStepResponse(w, http.StatusOK, "admin", map[string]any{
		"request": payload,
		"admin":   record,
	})
}

func (routes apiRoutes) handleBootstrapStructureStep(w http.ResponseWriter, r *http.Request) {
	payload, ok := decodeBootstrapRequest[bootstrapStructureStepRequest](w, r)
	if !ok {
		return
	}
	payload.OrganizationName = strings.TrimSpace(payload.OrganizationName)
	payload.DepartmentName = strings.TrimSpace(payload.DepartmentName)
	payload.TeamName = strings.TrimSpace(payload.TeamName)
	payload.ProjectName = strings.TrimSpace(payload.ProjectName)

	if payload.DepartmentName == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Department name is required.")
		return
	}

	if payload.TeamName == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Team name is required.")
		return
	}

	if payload.ProjectName == "" {
		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_request", "Project name is required.")
		return
	}

	record, err := routes.bootstrapService().SaveStructure(r.Context(), bootstrapservice.SaveStructureInput{
		OrganizationName: payload.OrganizationName,
		DepartmentName:   payload.DepartmentName,
		TeamName:         payload.TeamName,
		ProjectName:      payload.ProjectName,
	})
	if err != nil {
		routes.writeBootstrapPersistenceError(w, r, err)
		return
	}

	routes.writeBootstrapStepResponse(w, http.StatusOK, "structure", map[string]any{
		"request":   payload,
		"structure": record,
	})
}

func (routes apiRoutes) bootstrapService() *bootstrapservice.Service {
	return bootstrapservice.NewService(routes.cfg.Database)
}

func (routes apiRoutes) writeBootstrapStepResponse(w http.ResponseWriter, status int, step string, payload any) {
	WriteJSON(w, status, map[string]any{
		"data": map[string]any{
			"step":   step,
			"result": payload,
		},
		"meta": map[string]any{
			"resource":  "bootstrap-step",
			"persisted": true,
		},
	})
}

func (routes apiRoutes) writeBootstrapPersistenceError(w http.ResponseWriter, r *http.Request, err error) {
	switch {
	case errors.Is(err, bootstrapservice.ErrInstallationNotConfigured), errors.Is(err, bootstrapservice.ErrAdminNotConfigured):
		WriteError(w, http.StatusConflict, RequestIDFromContext(r.Context()), "bootstrap_prerequisite_missing", err.Error())
	default:
		routes.cfg.Logger.Error("persist bootstrap step", "error", err, "path", r.URL.Path)
		message := "Failed to persist bootstrap data."
		if routes.cfg.Config.IsDevelopment() {
			message = message + " " + err.Error()
		}
		WriteError(w, http.StatusInternalServerError, RequestIDFromContext(r.Context()), "bootstrap_persist_failed", message)
	}
}

func decodeBootstrapRequest[T any](w http.ResponseWriter, r *http.Request) (T, bool) {
	var payload T

	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 for this bootstrap step.")
			return payload, false
		}

		WriteError(w, http.StatusBadRequest, RequestIDFromContext(r.Context()), "invalid_json", "The request body must be valid JSON for this bootstrap step.")
		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
}