package es2

import (
	"bytes"
	"context"
	"crypto/tls"
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"github.com/nutcas3/telecom-platform/apps/carrier-connector/internal/config"
)

type ES2Client struct {
	httpClient *http.Client
	config     *config.ES2Config
	baseURL    string
}

func NewES2Client(cfg *config.ES2Config) *ES2Client {
	return &ES2Client{
		httpClient: &http.Client{
			Timeout: 30 * time.Second,
			Transport: &http.Transport{
				TLSClientConfig: &tls.Config{
					InsecureSkipVerify: cfg.InsecureSkipVerify,
				},
			},
		},
		config:  cfg,
		baseURL: cfg.BaseURL,
	}
}

func (c *ES2Client) DownloadProfile(ctx context.Context, req *DownloadProfileRequest) (*DownloadProfileResponse, error) {
	url := fmt.Sprintf("%s/es2plus/downloadProfile", c.baseURL)

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

	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(payload))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	c.setHeaders(httpReq)

	resp, err := c.httpClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
	}

	var downloadResp DownloadProfileResponse
	if err := json.NewDecoder(resp.Body).Decode(&downloadResp); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	return &downloadResp, nil
}

func (c *ES2Client) GetProfileStatus(ctx context.Context, req *GetProfileStatusRequest) (*GetProfileStatusResponse, error) {
	url := fmt.Sprintf("%s/es2plus/getProfileStatus", c.baseURL)

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

	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(payload))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	c.setHeaders(httpReq)

	resp, err := c.httpClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
	}

	var statusResp GetProfileStatusResponse
	if err := json.NewDecoder(resp.Body).Decode(&statusResp); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	return &statusResp, nil
}

func (c *ES2Client) DeleteProfile(ctx context.Context, req *DeleteProfileRequest) (*DeleteProfileResponse, error) {
	url := fmt.Sprintf("%s/es2plus/deleteProfile", c.baseURL)

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

	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(payload))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	c.setHeaders(httpReq)

	resp, err := c.httpClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
	}

	var deleteResp DeleteProfileResponse
	if err := json.NewDecoder(resp.Body).Decode(&deleteResp); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	return &deleteResp, nil
}

func (c *ES2Client) EnableProfile(ctx context.Context, req *EnableProfileRequest) (*EnableProfileResponse, error) {
	url := fmt.Sprintf("%s/es2plus/enableProfile", c.baseURL)

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

	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(payload))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	c.setHeaders(httpReq)

	resp, err := c.httpClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
	}

	var enableResp EnableProfileResponse
	if err := json.NewDecoder(resp.Body).Decode(&enableResp); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	return &enableResp, nil
}

func (c *ES2Client) DisableProfile(ctx context.Context, req *DisableProfileRequest) (*DisableProfileResponse, error) {
	url := fmt.Sprintf("%s/es2plus/disableProfile", c.baseURL)

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

	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(payload))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	c.setHeaders(httpReq)

	resp, err := c.httpClient.Do(httpReq)
	if err != nil {
		return nil, fmt.Errorf("failed to send request: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
	}

	var disableResp DisableProfileResponse
	if err := json.NewDecoder(resp.Body).Decode(&disableResp); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	return &disableResp, nil
}

func (c *ES2Client) setHeaders(req *http.Request) {
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Accept", "application/json")
	req.Header.Set("User-Agent", "Telecom-Platform/1.0")

	if c.config.APIKey != "" {
		req.Header.Set("Authorization", "Bearer "+c.config.APIKey)
	}

	if c.config.FunctionalityRequesterID != "" {
		req.Header.Set("X-Admin-Protocol", "gsma-rsp")
		req.Header.Set("X-Request-ID", generateRequestID())
	}
}

func generateRequestID() string {
	return fmt.Sprintf("%d", time.Now().UnixNano())
}

type DownloadProfileRequest struct {
	EID              string `json:"eid"`
	ICCID            string `json:"iccid"`
	ProfileType      string `json:"profileType"`
	ConfirmationCode string `json:"confirmationCode,omitempty"`
}

type DownloadProfileResponse struct {
	ExecutionStatus string `json:"executionStatus"`
	StatusMessage   string `json:"statusMessage"`
}

type GetProfileStatusRequest struct {
	EID   string `json:"eid"`
	ICCID string `json:"iccid"`
}

type GetProfileStatusResponse struct {
	ExecutionStatus string `json:"executionStatus"`
	StatusMessage   string `json:"statusMessage"`
	ProfileState    string `json:"profileState,omitempty"`
}

type DeleteProfileRequest struct {
	EID   string `json:"eid"`
	ICCID string `json:"iccid"`
}

type DeleteProfileResponse struct {
	ExecutionStatus string `json:"executionStatus"`
	StatusMessage   string `json:"statusMessage"`
}

type EnableProfileRequest struct {
	EID   string `json:"eid"`
	ICCID string `json:"iccid"`
}

type EnableProfileResponse struct {
	ExecutionStatus string `json:"executionStatus"`
	StatusMessage   string `json:"statusMessage"`
}

type DisableProfileRequest struct {
	EID   string `json:"eid"`
	ICCID string `json:"iccid"`
}

type DisableProfileResponse struct {
	ExecutionStatus string `json:"executionStatus"`
	StatusMessage   string `json:"statusMessage"`
}