package api

import (
	"encoding/json"
	"time"
)

// Simplified protocol using JSON instead of binary serialization

// Response represents a simplified API response
type Response struct {
	Type      string      `json:"type"`
	Timestamp int64       `json:"timestamp"`
	Data      interface{} `json:"data,omitempty"`
	Error     *ErrorInfo  `json:"error,omitempty"`
}

// ErrorInfo represents error information
type ErrorInfo struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
	Details string `json:"details,omitempty"`
}

// ProgressInfo represents progress information
type ProgressInfo struct {
	Type    string `json:"type"`
	Value   uint32 `json:"value"`
	Total   uint32 `json:"total"`
	Message string `json:"message"`
}

// LogInfo represents log information
type LogInfo struct {
	Level   string `json:"level"`
	Message string `json:"message"`
}

// Response types
const (
	TypeSuccess  = "success"
	TypeError    = "error"
	TypeProgress = "progress"
	TypeStatus   = "status"
	TypeData     = "data"
	TypeLog      = "log"
)

// Error codes
const (
	ErrUnknown          = 0
	ErrInvalidRequest   = 1
	ErrAuthFailed       = 2
	ErrPermissionDenied = 3
	ErrNotFound         = 4
	ErrExists           = 5
	ErrServerOverload   = 16
	ErrDatabase         = 17
	ErrNetwork          = 18
	ErrStorage          = 19
	ErrTimeout          = 20
)

// NewSuccessResponse creates a success response
func NewSuccessResponse(message string) *Response {
	return &Response{
		Type:      TypeSuccess,
		Timestamp: time.Now().Unix(),
		Data:      message,
	}
}

// NewSuccessResponseWithData creates a success response with data
func NewSuccessResponseWithData(message string, data interface{}) *Response {
	return &Response{
		Type:      TypeData,
		Timestamp: time.Now().Unix(),
		Data: map[string]interface{}{
			"message": message,
			"payload": data,
		},
	}
}

// NewErrorResponse creates an error response
func NewErrorResponse(code int, message, details string) *Response {
	return &Response{
		Type:      TypeError,
		Timestamp: time.Now().Unix(),
		Error: &ErrorInfo{
			Code:    code,
			Message: message,
			Details: details,
		},
	}
}

// NewProgressResponse creates a progress response
func NewProgressResponse(progressType string, value, total uint32, message string) *Response {
	return &Response{
		Type:      TypeProgress,
		Timestamp: time.Now().Unix(),
		Data: ProgressInfo{
			Type:    progressType,
			Value:   value,
			Total:   total,
			Message: message,
		},
	}
}

// NewStatusResponse creates a status response
func NewStatusResponse(data string) *Response {
	return &Response{
		Type:      TypeStatus,
		Timestamp: time.Now().Unix(),
		Data:      data,
	}
}

// NewDataResponse creates a data response
func NewDataResponse(dataType string, payload interface{}) *Response {
	return &Response{
		Type:      TypeData,
		Timestamp: time.Now().Unix(),
		Data: map[string]interface{}{
			"type":    dataType,
			"payload": payload,
		},
	}
}

// NewLogResponse creates a log response
func NewLogResponse(level, message string) *Response {
	return &Response{
		Type:      TypeLog,
		Timestamp: time.Now().Unix(),
		Data: LogInfo{
			Level:   level,
			Message: message,
		},
	}
}

// ToJSON converts the response to JSON bytes
func (r *Response) ToJSON() ([]byte, error) {
	return json.Marshal(r)
}

// FromJSON creates a response from JSON bytes
func FromJSON(data []byte) (*Response, error) {
	var response Response
	err := json.Unmarshal(data, &response)
	return &response, err
}