package client

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"git.aiterp.net/lucifer/new-server/models"
	"io"
	"net"
	"net/http"
	"strings"
	"time"
)

type Client struct {
	APIRoot string
}

func (client *Client) GetDevices(ctx context.Context, fetchStr string) ([]models.Device, error) {
	devices := make([]models.Device, 0, 16)
	err := client.Fetch(ctx, "GET", "/api/devices/"+fetchStr, &devices, nil)
	if err != nil {
		return nil, err
	}

	return devices, nil
}

func (client *Client) PutDevice(ctx context.Context, fetchStr string, update models.DeviceUpdate) ([]models.Device, error) {
	devices := make([]models.Device, 0, 16)
	err := client.Fetch(ctx, "PUT", "/api/devices/"+fetchStr, &devices, update)
	if err != nil {
		return nil, err
	}

	return devices, nil
}

func (client *Client) PutDeviceState(ctx context.Context, fetchStr string, update models.NewDeviceState) ([]models.Device, error) {
	devices := make([]models.Device, 0, 16)
	err := client.Fetch(ctx, "PUT", "/api/devices/"+fetchStr+"/state", &devices, update)
	if err != nil {
		return nil, err
	}

	return devices, nil
}

func (client *Client) PutDeviceTags(ctx context.Context, fetchStr string, addTags []string, removeTags []string) ([]models.Device, error) {
	devices := make([]models.Device, 0, 16)
	err := client.Fetch(ctx, "PUT", "/api/devices/"+fetchStr+"/tags", &devices, map[string][]string{
		"add":    addTags,
		"remove": removeTags,
	})
	if err != nil {
		return nil, err
	}

	return devices, nil
}

func (client *Client) AssignDevice(ctx context.Context, fetchStr string, push bool, assignment models.DeviceSceneAssignment) ([]models.Device, error) {
	query := ""
	if push {
		query = "?push=true"
	}

	devices := make([]models.Device, 0, 16)
	err := client.Fetch(ctx, "PUT", "/api/devices/"+fetchStr+"/scene"+query, &devices, assignment)
	if err != nil {
		return nil, err
	}

	return devices, nil
}

func (client *Client) ClearDevice(ctx context.Context, fetchStr string) ([]models.Device, error) {
	devices := make([]models.Device, 0, 16)
	err := client.Fetch(ctx, "DELETE", "/api/devices/"+fetchStr+"/scene", &devices, nil)
	if err != nil {
		return nil, err
	}

	return devices, nil
}

func (client *Client) FireEvent(ctx context.Context, event models.Event) error {
	err := client.Fetch(ctx, "POST", "/api/events", nil, event)
	if err != nil {
		return err
	}

	return nil
}

func (client *Client) Fetch(ctx context.Context, method string, path string, dst interface{}, body interface{}) error {
	var reqBody io.ReadWriter
	if body != nil && method != "GET" {
		reqBody = bytes.NewBuffer(make([]byte, 0, 512))

		err := json.NewEncoder(reqBody).Encode(body)
		if err != nil {
			return err
		}
	}

	req, err := http.NewRequest(method, client.APIRoot+path, reqBody)
	if err != nil {
		return err
	}

	res, err := httpClient.Do(req.WithContext(ctx))
	if err != nil {
		return err
	}
	defer res.Body.Close()

	if !strings.HasPrefix(res.Header.Get("Content-Type"), "application/json") {
		return fmt.Errorf("%s: %s", path, res.Status)
	}

	var resJson struct {
		Code    int             `json:"code"`
		Message *string         `json:"message"`
		Data    json.RawMessage `json:"data"`
	}
	err = json.NewDecoder(res.Body).Decode(&resJson)
	if err != nil {
		return err
	}

	if resJson.Code != 200 {
		msg := ""
		if resJson.Message != nil {
			msg = *resJson.Message
		}

		return fmt.Errorf("%d: %s", resJson.Code, msg)
	}

	if dst == nil {
		return nil
	}

	return json.Unmarshal(resJson.Data, dst)
}

var httpClient = &http.Client{
	Transport: &http.Transport{
		Proxy: http.ProxyFromEnvironment,
		DialContext: (&net.Dialer{
			Timeout:   30 * time.Second,
			KeepAlive: 30 * time.Second,
		}).DialContext,
		MaxIdleConns:        16,
		MaxIdleConnsPerHost: 16,
		IdleConnTimeout:     time.Minute,
	},
	Timeout: time.Minute,
}