package client

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"strings"
)

var ErrResourceNotFound = fmt.Errorf("resource not found")

type EdgeConnect struct {
	BaseURL     string
	HttpClient  *http.Client
	Credentials Credentials
}

type Credentials struct {
	Username string
	Password string
}

func (e *EdgeConnect) RetrieveToken(ctx context.Context) (string, error) {
	json_data, err := json.Marshal(map[string]string{
		"username": e.Credentials.Username,
		"password": e.Credentials.Password,
	})
	if err != nil {
		return "", err
	}

	baseURL := strings.TrimRight(e.BaseURL, "/")
	request, err := http.NewRequestWithContext(ctx, "POST", baseURL+"/api/v1/login", bytes.NewBuffer(json_data))
	if err != nil {
		return "", err
	}
	request.Header.Set("Content-Type", "application/json")

	resp, err := e.HttpClient.Do(request)
	if err != nil {
		return "", err
	}

	defer resp.Body.Close()

	// Read the entire response body
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return "", fmt.Errorf("error reading response body: %v", err)
	}

	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("login failed with status %d: %s", resp.StatusCode, string(body))
	}

	var respData struct {
		Token string `json:"token"`
	}
	err = json.Unmarshal(body, &respData)
	if err != nil {
		return "", fmt.Errorf("error parsing JSON (status %d): %v", resp.StatusCode, err)
	}

	return respData.Token, nil
}

func (e *EdgeConnect) CreateApp(ctx context.Context, input NewAppInput) error {
	json_data, err := json.Marshal(input)
	if err != nil {
		return err
	}

	response, err := call[App](ctx, e, "/api/v1/auth/ctrl/CreateApp", json_data)
	if err != nil {
		return err
	}

	return response.Error()
}

func (e *EdgeConnect) ShowApp(ctx context.Context, appkey AppKey, region string) (App, error) {
	input := struct {
		App    App    `json:"App"`
		Region string `json:"Region"`
	}{
		App:    App{Key: appkey},
		Region: region,
	}

	json_data, err := json.Marshal(input)
	if err != nil {
		return App{}, err
	}

	responses, err := call[App](ctx, e, "/api/v1/auth/ctrl/ShowApp", json_data)
	if err != nil {
		return App{}, err
	}

	if responses.StatusCode == http.StatusNotFound {
		return App{}, fmt.Errorf("Error retrieving App: %w", ErrResourceNotFound)
	}

	if !responses.IsSuccessful() {
		return App{}, responses.Error()
	}

	apps := responses.GetData()
	if len(apps) > 0 {
		return apps[0], nil
	}

	return App{}, fmt.Errorf("could not find app with region/key: %s/%v: %w", region, appkey, ErrResourceNotFound)
}

func (e *EdgeConnect) ShowApps(ctx context.Context, appkey AppKey, region string) ([]App, error) {
	input := struct {
		App    App    `json:"App"`
		Region string `json:"Region"`
	}{
		App:    App{Key: appkey},
		Region: region,
	}

	json_data, err := json.Marshal(input)
	if err != nil {
		return nil, err
	}

	responses, err := call[App](ctx, e, "/api/v1/auth/ctrl/ShowApp", json_data)
	if err != nil {
		return nil, err
	}

	if !responses.IsSuccessful() && responses.StatusCode != http.StatusNotFound {
		return nil, responses.Error()
	}

	return responses.GetData(), nil
}

func (e *EdgeConnect) DeleteApp(ctx context.Context, appkey AppKey, region string) error {
	input := struct {
		App    App    `json:"App"`
		Region string `json:"Region"`
	}{
		App:    App{Key: appkey},
		Region: region,
	}

	json_data, err := json.Marshal(input)
	if err != nil {
		return err
	}

	response, err := call[App](ctx, e, "/api/v1/auth/ctrl/DeleteApp", json_data)
	if err != nil {
		return err
	}

	if !response.IsSuccessful() && response.StatusCode != 404 {
		return response.Error()
	}

	return nil
}

func (e *EdgeConnect) CreateAppInstance(ctx context.Context, input NewAppInstanceInput) error {
	json_data, err := json.Marshal(input)
	if err != nil {
		log.Printf("failed to marshal NewAppInstanceInput %v\n", err)
		return err
	}

	responses, err := call[AppInstance](ctx, e, "/api/v1/auth/ctrl/CreateAppInst", json_data)
	if err != nil {
		return err
	}

	return responses.Error()
}

func (e *EdgeConnect) ShowAppInstance(ctx context.Context, appinstkey AppInstanceKey, region string) (AppInstance, error) {
	input := struct {
		App    AppInstance `json:"appinst"`
		Region string      `json:"Region"`
	}{
		App:    AppInstance{Key: appinstkey},
		Region: region,
	}

	json_data, err := json.Marshal(input)
	if err != nil {
		return AppInstance{}, err
	}

	responses, err := call[AppInstance](ctx, e, "/api/v1/auth/ctrl/ShowAppInst", json_data)
	if err != nil {
		return AppInstance{}, err
	}

	if responses.StatusCode == http.StatusNotFound {
		return AppInstance{}, fmt.Errorf("Error retrieving AppInstance: %w", ErrResourceNotFound)
	}

	if !responses.IsSuccessful() {
		return AppInstance{}, responses.Error()
	}

	data := responses.GetData()
	if len(data) > 0 {
		return data[0], nil
	}

	return AppInstance{}, fmt.Errorf("could not find app instance: %v: %w", responses, ErrResourceNotFound)
}

func (e *EdgeConnect) ShowAppInstances(ctx context.Context, appinstkey AppInstanceKey, region string) ([]AppInstance, error) {
	input := struct {
		App    AppInstance `json:"appinst"`
		Region string      `json:"Region"`
	}{
		App:    AppInstance{Key: appinstkey},
		Region: region,
	}

	json_data, err := json.Marshal(input)
	if err != nil {
		return nil, err
	}

	responses, err := call[AppInstance](ctx, e, "/api/v1/auth/ctrl/ShowAppInst", json_data)
	if err != nil {
		return nil, err
	}

	if !responses.IsSuccessful() && responses.StatusCode != http.StatusNotFound {
		return nil, responses.Error()
	}

	return responses.GetData(), nil
}

func (e *EdgeConnect) DeleteAppInstance(ctx context.Context, appinstancekey AppInstanceKey, region string) error {
	input := struct {
		AppInstance AppInstance `json:"appinst"`
		Region      string      `json:"Region"`
	}{
		AppInstance: AppInstance{Key: appinstancekey},
		Region:      region,
	}

	json_data, err := json.Marshal(input)
	if err != nil {
		return err
	}

	responses, err := call[AppInstance](ctx, e, "/api/v1/auth/ctrl/DeleteAppInst", json_data)
	if err != nil {
		return err
	}

	return responses.Error()
}

func call[T Message](ctx context.Context, client *EdgeConnect, path string, body []byte) (Responses[T], error) {
	token, err := client.RetrieveToken(ctx)
	if err != nil {
		return Responses[T]{}, err
	}

	request, err := http.NewRequestWithContext(ctx, "POST", fmt.Sprintf("%s%s", client.BaseURL, path), bytes.NewBuffer(body))
	if err != nil {
		return Responses[T]{}, err
	}
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))

	resp, err := client.HttpClient.Do(request)
	if err != nil {
		return Responses[T]{}, err
	}
	defer resp.Body.Close()

	responses := Responses[T]{}
	responses.StatusCode = resp.StatusCode

	if responses.StatusCode == http.StatusNotFound {
		return responses, nil
	}

	decoder := json.NewDecoder(resp.Body)
	for {
		var d Response[T]
		if err := decoder.Decode(&d); err != nil {
			if err.Error() == "EOF" {
				break
			}
			log.Printf("Error in call %s: %v", path, err)
			return Responses[T]{}, fmt.Errorf("Error in call %s: %w", path, err)
		}
		responses.Responses = append(responses.Responses, d)
	}

	log.Printf("call(): %s resulting in http status %v and %v responses\n", path, resp.StatusCode, len(responses.GetMessages()))
	for i, v := range responses.GetMessages() {
		log.Printf("call(): response[%v]: %s\n", i, v)
	}

	return responses, nil
}