package client

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"net/url"
	"strings"
	"time"

	log "github.com/sirupsen/logrus"
)

// SporeClient represents a client for communicating with SPORE nodes
type SporeClient struct {
	BaseURL    string
	HTTPClient *http.Client
}

// NewSporeClient creates a new SPORE API client
func NewSporeClient(baseURL string) *SporeClient {
	return &SporeClient{
		BaseURL: baseURL,
		HTTPClient: &http.Client{
			Timeout: 30 * time.Second,
		},
	}
}

// ClusterStatusResponse represents the response from /api/cluster/members
type ClusterStatusResponse struct {
	Members []ClusterMember `json:"members"`
}

// ClusterMember represents a member in the cluster
type ClusterMember struct {
	IP        string                 `json:"ip"`
	Hostname  string                 `json:"hostname"`
	Status    string                 `json:"status"`
	Latency   int64                  `json:"latency"`
	LastSeen  int64                  `json:"lastSeen"`
	Labels    map[string]string      `json:"labels"`
	Resources map[string]interface{} `json:"resources"`
}

// TaskStatusResponse represents the response from /api/tasks/status
type TaskStatusResponse struct {
	Summary TaskSummary `json:"summary"`
	Tasks   []TaskInfo  `json:"tasks"`
	System  SystemInfo  `json:"system"`
}

// TaskSummary represents task summary information
type TaskSummary struct {
	TotalTasks  int `json:"totalTasks"`
	ActiveTasks int `json:"activeTasks"`
}

// TaskInfo represents information about a task
type TaskInfo struct {
	Name      string `json:"name"`
	Interval  int    `json:"interval"`
	Enabled   bool   `json:"enabled"`
	Running   bool   `json:"running"`
	AutoStart bool   `json:"autoStart"`
}

// SystemInfo represents system information
type SystemInfo struct {
	FreeHeap int64 `json:"freeHeap"`
	Uptime   int64 `json:"uptime"`
}

// SystemStatusResponse represents the response from /api/node/status
type SystemStatusResponse struct {
	FreeHeap      int64             `json:"freeHeap"`
	ChipID        int64             `json:"chipId"`
	SDKVersion    string            `json:"sdkVersion"`
	CPUFreqMHz    int               `json:"cpuFreqMHz"`
	FlashChipSize int64             `json:"flashChipSize"`
	Labels        map[string]string `json:"labels"`
}

// CapabilitiesResponse represents the response from /api/node/endpoints
type CapabilitiesResponse struct {
	Endpoints []EndpointInfo `json:"endpoints"`
}

// EndpointInfo represents information about an API endpoint
type EndpointInfo struct {
	URI        string          `json:"uri"`
	Method     string          `json:"method"`
	Parameters []ParameterInfo `json:"params"`
}

// ParameterInfo represents information about a parameter
type ParameterInfo struct {
	Name        string   `json:"name"`
	Type        string   `json:"type"`
	Required    bool     `json:"required"`
	Description string   `json:"description"`
	Location    string   `json:"location"` // query, path, body
	Default     string   `json:"default,omitempty"`
	Values      []string `json:"values,omitempty"`
}

// FirmwareUpdateResponse represents the response from firmware update
type FirmwareUpdateResponse struct {
	Status  string `json:"status"`
	Message string `json:"message"`
}

// GetClusterStatus retrieves cluster member information
func (c *SporeClient) GetClusterStatus() (*ClusterStatusResponse, error) {
	url := fmt.Sprintf("%s/api/cluster/members", c.BaseURL)

	log.WithFields(log.Fields{
		"node_url": c.BaseURL,
		"endpoint": "/api/cluster/members",
	}).Debug("Fetching cluster status from SPORE node")

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to fetch cluster status from SPORE node")
		return nil, fmt.Errorf("failed to get cluster status: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		log.WithFields(log.Fields{
			"node_url":    c.BaseURL,
			"status_code": resp.StatusCode,
		}).Debug("Cluster status request returned non-OK status")
		return nil, fmt.Errorf("cluster status request failed with status %d", resp.StatusCode)
	}

	var clusterStatus ClusterStatusResponse
	if err := json.NewDecoder(resp.Body).Decode(&clusterStatus); err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to decode cluster status response")
		return nil, fmt.Errorf("failed to decode cluster status response: %w", err)
	}

	log.WithFields(log.Fields{
		"node_url":     c.BaseURL,
		"member_count": len(clusterStatus.Members),
	}).Debug("Successfully fetched cluster status from SPORE node")

	return &clusterStatus, nil
}

// GetTaskStatus retrieves task status information
func (c *SporeClient) GetTaskStatus() (*TaskStatusResponse, error) {
	url := fmt.Sprintf("%s/api/tasks/status", c.BaseURL)

	log.WithFields(log.Fields{
		"node_url": c.BaseURL,
		"endpoint": "/api/tasks/status",
	}).Debug("Fetching task status from SPORE node")

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to fetch task status from SPORE node")
		return nil, fmt.Errorf("failed to get task status: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		log.WithFields(log.Fields{
			"node_url":    c.BaseURL,
			"status_code": resp.StatusCode,
		}).Debug("Task status request returned non-OK status")
		return nil, fmt.Errorf("task status request failed with status %d", resp.StatusCode)
	}

	var taskStatus TaskStatusResponse
	if err := json.NewDecoder(resp.Body).Decode(&taskStatus); err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to decode task status response")
		return nil, fmt.Errorf("failed to decode task status response: %w", err)
	}

	log.WithFields(log.Fields{
		"node_url":     c.BaseURL,
		"total_tasks":  taskStatus.Summary.TotalTasks,
		"active_tasks": taskStatus.Summary.ActiveTasks,
	}).Debug("Successfully fetched task status from SPORE node")

	return &taskStatus, nil
}

// GetSystemStatus retrieves system status information
func (c *SporeClient) GetSystemStatus() (*SystemStatusResponse, error) {
	url := fmt.Sprintf("%s/api/node/status", c.BaseURL)

	log.WithFields(log.Fields{
		"node_url": c.BaseURL,
		"endpoint": "/api/node/status",
	}).Debug("Fetching system status from SPORE node")

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to fetch system status from SPORE node")
		return nil, fmt.Errorf("failed to get system status: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		log.WithFields(log.Fields{
			"node_url":    c.BaseURL,
			"status_code": resp.StatusCode,
		}).Debug("System status request returned non-OK status")
		return nil, fmt.Errorf("system status request failed with status %d", resp.StatusCode)
	}

	var systemStatus SystemStatusResponse
	if err := json.NewDecoder(resp.Body).Decode(&systemStatus); err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to decode system status response")
		return nil, fmt.Errorf("failed to decode system status response: %w", err)
	}

	log.WithFields(log.Fields{
		"node_url":  c.BaseURL,
		"free_heap": systemStatus.FreeHeap,
		"chip_id":   systemStatus.ChipID,
	}).Debug("Successfully fetched system status from SPORE node")

	return &systemStatus, nil
}

// GetCapabilities retrieves available API endpoints
func (c *SporeClient) GetCapabilities() (*CapabilitiesResponse, error) {
	url := fmt.Sprintf("%s/api/node/endpoints", c.BaseURL)

	log.WithFields(log.Fields{
		"node_url": c.BaseURL,
		"endpoint": "/api/node/endpoints",
	}).Debug("Fetching capabilities from SPORE node")

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to fetch capabilities from SPORE node")
		return nil, fmt.Errorf("failed to get capabilities: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		log.WithFields(log.Fields{
			"node_url":    c.BaseURL,
			"status_code": resp.StatusCode,
		}).Debug("Capabilities request returned non-OK status")
		return nil, fmt.Errorf("capabilities request failed with status %d", resp.StatusCode)
	}

	var capabilities CapabilitiesResponse
	if err := json.NewDecoder(resp.Body).Decode(&capabilities); err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to decode capabilities response")
		return nil, fmt.Errorf("failed to decode capabilities response: %w", err)
	}

	log.WithFields(log.Fields{
		"node_url":       c.BaseURL,
		"endpoint_count": len(capabilities.Endpoints),
	}).Debug("Successfully fetched capabilities from SPORE node")

	return &capabilities, nil
}

// UpdateFirmware uploads firmware to a SPORE node
func (c *SporeClient) UpdateFirmware(firmwareData []byte, filename string) (*FirmwareUpdateResponse, error) {
	url := fmt.Sprintf("%s/api/node/update", c.BaseURL)

	log.WithFields(log.Fields{
		"node_url":  c.BaseURL,
		"endpoint":  "/api/node/update",
		"filename":  filename,
		"data_size": len(firmwareData),
	}).Debug("Preparing firmware upload to SPORE node")

	// Create multipart form
	var requestBody bytes.Buffer
	contentType := createMultipartForm(&requestBody, firmwareData, filename)

	if contentType == "" {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
		}).Debug("Failed to create multipart form for firmware upload")
		return nil, fmt.Errorf("failed to create multipart form")
	}

	req, err := http.NewRequest("POST", url, &requestBody)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to create firmware update request")
		return nil, fmt.Errorf("failed to create firmware update request: %w", err)
	}

	req.Header.Set("Content-Type", contentType)

	// Create a client with extended timeout for firmware uploads
	firmwareClient := &http.Client{
		Timeout: 5 * time.Minute, // 5 minutes for firmware uploads
	}

	log.WithFields(log.Fields{
		"node_url":  c.BaseURL,
		"filename":  filename,
		"data_size": len(firmwareData),
	}).Debug("Uploading firmware to SPORE node")

	resp, err := firmwareClient.Do(req)
	if err != nil {
		log.WithFields(log.Fields{
			"node_ip": c.BaseURL,
			"error":   err.Error(),
		}).Error("Failed to send firmware request to SPORE device")
		return nil, fmt.Errorf("failed to upload firmware: %w", err)
	}
	defer resp.Body.Close()

	log.WithFields(log.Fields{
		"node_ip":     c.BaseURL,
		"status_code": resp.StatusCode,
		"headers":     resp.Header,
	}).Debug("Received response from SPORE device")

	if resp.StatusCode != http.StatusOK {
		// Only try to read body for error cases
		body, _ := io.ReadAll(resp.Body)
		log.WithFields(log.Fields{
			"node_ip":    c.BaseURL,
			"status":     resp.StatusCode,
			"error_body": string(body),
		}).Error("SPORE device reported firmware upload failure")
		return nil, fmt.Errorf("firmware update failed with status %d: %s", resp.StatusCode, string(body))
	}

	// For successful firmware uploads, don't try to read the response body
	// The SPORE device restarts immediately after sending the response, so reading the body
	// would cause the connection to hang or timeout
	log.WithFields(log.Fields{
		"node_ip": c.BaseURL,
		"status":  "success_no_body",
	}).Info("Firmware upload completed successfully (device restarting)")

	updateResponse := FirmwareUpdateResponse{
		Status:  "OK",
		Message: "Firmware update completed successfully",
	}

	return &updateResponse, nil
}

// UpdateNodeLabels updates the labels on a SPORE node
func (c *SporeClient) UpdateNodeLabels(labels map[string]string) error {
	targetURL := fmt.Sprintf("%s/api/node/config", c.BaseURL)

	log.WithFields(log.Fields{
		"node_url": c.BaseURL,
		"endpoint": "/api/node/config",
		"labels":   labels,
	}).Debug("Updating node labels on SPORE node")

	// Convert labels to JSON
	labelsJSON, err := json.Marshal(labels)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to marshal labels")
		return fmt.Errorf("failed to marshal labels: %w", err)
	}

	// Create form data
	data := url.Values{}
	data.Set("labels", string(labelsJSON))

	req, err := http.NewRequest("POST", targetURL, strings.NewReader(data.Encode()))
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to create labels update request")
		return fmt.Errorf("failed to create labels update request: %w", err)
	}

	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"error":    err.Error(),
		}).Debug("Failed to update node labels")
		return fmt.Errorf("failed to update node labels: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		log.WithFields(log.Fields{
			"node_url":    c.BaseURL,
			"status_code": resp.StatusCode,
			"error_body":  string(body),
		}).Debug("Node labels update returned non-OK status")
		return fmt.Errorf("node labels update failed with status %d: %s", resp.StatusCode, string(body))
	}

	log.WithFields(log.Fields{
		"node_url": c.BaseURL,
		"labels":   labels,
	}).Debug("Successfully updated node labels on SPORE node")

	return nil
}

// ProxyCall makes a generic HTTP request to a SPORE node endpoint
func (c *SporeClient) ProxyCall(method, uri string, params map[string]interface{}) (*http.Response, error) {
	// Build target URL
	targetURL := fmt.Sprintf("%s%s", c.BaseURL, uri)

	log.WithFields(log.Fields{
		"node_url":    c.BaseURL,
		"method":      method,
		"endpoint":    uri,
		"param_count": len(params),
	}).Debug("Making proxy call to SPORE node")

	// Parse parameters and build request
	req, err := c.buildProxyRequest(method, targetURL, params)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"method":   method,
			"endpoint": uri,
			"error":    err.Error(),
		}).Debug("Failed to build proxy request")
		return nil, fmt.Errorf("failed to build proxy request: %w", err)
	}

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		log.WithFields(log.Fields{
			"node_url": c.BaseURL,
			"method":   method,
			"endpoint": uri,
			"error":    err.Error(),
		}).Debug("Proxy call failed")
		return nil, fmt.Errorf("proxy call failed: %w", err)
	}

	log.WithFields(log.Fields{
		"node_url":    c.BaseURL,
		"method":      method,
		"endpoint":    uri,
		"status_code": resp.StatusCode,
	}).Debug("Proxy call completed successfully")

	return resp, nil
}

// buildProxyRequest builds an HTTP request for proxy calls
func (c *SporeClient) buildProxyRequest(method, targetURL string, params map[string]interface{}) (*http.Request, error) {
	var body io.Reader
	var contentType string

	if method != "GET" && params != nil {
		// Use form-encoded data for all body parameters (matching index-standalone.js behavior)
		form := make(map[string][]string)
		query := make(map[string][]string)

		for name, value := range params {
			location := "body"

			// Check if value is a parameter object with location info
			if paramObj, ok := value.(map[string]interface{}); ok {
				if loc, exists := paramObj["location"].(string); exists {
					location = loc
				}
				// Extract the actual value
				if val, exists := paramObj["value"]; exists {
					value = val
				}
			}

			switch location {
			case "query":
				query[name] = append(query[name], fmt.Sprintf("%v", value))
			case "path":
				// Replace {name} or :name in path
				placeholder := fmt.Sprintf("{%s}", name)
				if strings.Contains(targetURL, placeholder) {
					targetURL = strings.ReplaceAll(targetURL, placeholder, fmt.Sprintf("%v", value))
				}
				placeholder = fmt.Sprintf(":%s", name)
				if strings.Contains(targetURL, placeholder) {
					targetURL = strings.ReplaceAll(targetURL, placeholder, fmt.Sprintf("%v", value))
				}
			default:
				// Use form-encoded data for all body parameters (matching index-standalone.js behavior)
				// This is simpler and more reliable than trying to detect JSON automatically
				form[name] = append(form[name], fmt.Sprintf("%v", value))
			}
		}

		// Add query parameters to URL
		if len(query) > 0 {
			urlObj, err := url.Parse(targetURL)
			if err != nil {
				return nil, fmt.Errorf("invalid target URL: %w", err)
			}

			q := urlObj.Query()
			for key, values := range query {
				for _, value := range values {
					q.Add(key, value)
				}
			}
			urlObj.RawQuery = q.Encode()
			targetURL = urlObj.String()
		}

		// Create request body - always use form-encoded data for consistency
		if len(form) > 0 {
			data := url.Values{}
			for key, values := range form {
				for _, value := range values {
					data.Add(key, value)
				}
			}
			body = strings.NewReader(data.Encode())
			contentType = "application/x-www-form-urlencoded"
		}
	}

	req, err := http.NewRequest(method, targetURL, body)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	if method != "GET" && contentType != "" {
		req.Header.Set("Content-Type", contentType)
	}

	return req, nil
}

// Helper function to create multipart form for file uploads
func createMultipartForm(requestBody *bytes.Buffer, firmwareData []byte, filename string) string {
	writer := multipart.NewWriter(requestBody)

	// Add file field
	fileWriter, err := writer.CreateFormFile("firmware", filename)
	if err != nil {
		log.WithError(err).Error("Failed to create form file")
		return ""
	}

	_, err = fileWriter.Write(firmwareData)
	if err != nil {
		log.WithError(err).Error("Failed to write file data")
		return ""
	}

	err = writer.Close()
	if err != nil {
		log.WithError(err).Error("Failed to close multipart writer")
		return ""
	}

	return writer.FormDataContentType()
}