package registry

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

	log "github.com/sirupsen/logrus"
)

// RegistryClient represents a client for communicating with the SPORE registry
type RegistryClient struct {
	BaseURL    string
	HTTPClient *http.Client
}

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

// FirmwareRecord represents a firmware record from the registry
type FirmwareRecord struct {
	Name    string            `json:"name"`
	Version string            `json:"version"`
	Size    int64             `json:"size"`
	Labels  map[string]string `json:"labels"`
	Path    string            `json:"download_url"`
}

// GroupedFirmware represents firmware grouped by name
type GroupedFirmware struct {
	Name     string           `json:"name"`
	Firmware []FirmwareRecord `json:"firmware"`
}

// FindFirmwareByNameAndVersion finds firmware in the registry by name and version
func (c *RegistryClient) FindFirmwareByNameAndVersion(name, version string) (*FirmwareRecord, error) {
	// Get all firmware from registry
	firmwareList, err := c.ListFirmware()
	if err != nil {
		return nil, fmt.Errorf("failed to list firmware: %w", err)
	}

	// Search through all firmware groups
	for _, group := range firmwareList {
		if group.Name == name {
			for _, firmware := range group.Firmware {
				if firmware.Version == version {
					return &firmware, nil
				}
			}
		}
	}

	return nil, fmt.Errorf("no firmware found with name %s and version %s", name, version)
}

// GetHealth checks the health of the registry
func (c *RegistryClient) GetHealth() (map[string]interface{}, error) {
	url := fmt.Sprintf("%s/health", c.BaseURL)

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		return nil, fmt.Errorf("failed to get registry health: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("registry health check failed with status %d", resp.StatusCode)
	}

	var health map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&health); err != nil {
		return nil, fmt.Errorf("failed to decode health response: %w", err)
	}

	return health, nil
}

// UploadFirmware uploads firmware to the registry
func (c *RegistryClient) UploadFirmware(metadata FirmwareMetadata, firmwareFile io.Reader) (map[string]interface{}, error) {
	url := fmt.Sprintf("%s/firmware", c.BaseURL)

	// Create multipart form data
	body := &bytes.Buffer{}
	writer := multipart.NewWriter(body)

	// Add metadata
	metadataJSON, err := json.Marshal(metadata)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal metadata: %w", err)
	}

	metadataPart, err := writer.CreateFormField("metadata")
	if err != nil {
		return nil, fmt.Errorf("failed to create metadata field: %w", err)
	}
	metadataPart.Write(metadataJSON)

	// Add firmware file
	firmwarePart, err := writer.CreateFormFile("firmware", fmt.Sprintf("%s-%s.bin", metadata.Name, metadata.Version))
	if err != nil {
		return nil, fmt.Errorf("failed to create firmware field: %w", err)
	}

	if _, err := io.Copy(firmwarePart, firmwareFile); err != nil {
		return nil, fmt.Errorf("failed to copy firmware data: %w", err)
	}

	writer.Close()

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

	req.Header.Set("Content-Type", writer.FormDataContentType())

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to upload firmware: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("firmware upload failed with status %d: %s", resp.StatusCode, string(body))
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return nil, fmt.Errorf("failed to decode upload response: %w", err)
	}

	return result, nil
}

// UpdateFirmwareMetadata updates firmware metadata in the registry
func (c *RegistryClient) UpdateFirmwareMetadata(name, version string, metadata FirmwareMetadata) (map[string]interface{}, error) {
	url := fmt.Sprintf("%s/firmware/%s/%s", c.BaseURL, name, version)

	metadataJSON, err := json.Marshal(metadata)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal metadata: %w", err)
	}

	req, err := http.NewRequest("PUT", url, bytes.NewBuffer(metadataJSON))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("failed to update firmware metadata: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("firmware metadata update failed with status %d: %s", resp.StatusCode, string(body))
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return nil, fmt.Errorf("failed to decode update response: %w", err)
	}

	return result, nil
}

// FirmwareMetadata represents firmware metadata for uploads
type FirmwareMetadata struct {
	Name    string            `json:"name"`
	Version string            `json:"version"`
	Labels  map[string]string `json:"labels"`
}

// FindFirmwareByLabels finds firmware in the registry that matches the given labels
func (c *RegistryClient) FindFirmwareByLabels(labels map[string]string) (*FirmwareRecord, error) {
	// Get all firmware from registry
	firmwareList, err := c.ListFirmware()
	if err != nil {
		return nil, fmt.Errorf("failed to list firmware: %w", err)
	}

	// Search through all firmware groups
	for _, group := range firmwareList {
		for _, firmware := range group.Firmware {
			if c.firmwareMatchesLabels(firmware.Labels, labels) {
				return &firmware, nil
			}
		}
	}

	return nil, fmt.Errorf("no firmware found matching labels: %v", labels)
}

// firmwareMatchesLabels checks if firmware labels match the rollout labels
func (c *RegistryClient) firmwareMatchesLabels(firmwareLabels, rolloutLabels map[string]string) bool {
	for key, value := range rolloutLabels {
		if firmwareValue, exists := firmwareLabels[key]; !exists || firmwareValue != value {
			return false
		}
	}
	return true
}

// ListFirmware retrieves all firmware from the registry
func (c *RegistryClient) ListFirmware() ([]GroupedFirmware, error) {
	url := fmt.Sprintf("%s/firmware", c.BaseURL)

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		return nil, fmt.Errorf("failed to get firmware list: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("firmware list request failed with status %d", resp.StatusCode)
	}

	var firmwareList []GroupedFirmware
	if err := json.NewDecoder(resp.Body).Decode(&firmwareList); err != nil {
		return nil, fmt.Errorf("failed to decode firmware list response: %w", err)
	}

	return firmwareList, nil
}

// DownloadFirmware downloads firmware binary from the registry
func (c *RegistryClient) DownloadFirmware(name, version string) ([]byte, error) {
	url := fmt.Sprintf("%s/firmware/%s/%s", c.BaseURL, name, version)

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		return nil, fmt.Errorf("failed to download firmware: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("firmware download request failed with status %d", resp.StatusCode)
	}

	data, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read firmware data: %w", err)
	}

	log.WithFields(log.Fields{
		"name":    name,
		"version": version,
		"size":    len(data),
	}).Info("Downloaded firmware from registry")

	return data, nil
}

// HealthCheck checks if the registry is healthy
func (c *RegistryClient) HealthCheck() error {
	url := fmt.Sprintf("%s/health", c.BaseURL)

	resp, err := c.HTTPClient.Get(url)
	if err != nil {
		return fmt.Errorf("failed to check registry health: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("registry health check failed with status %d", resp.StatusCode)
	}

	return nil
}