/*
Copyright 2022 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package civocloud

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"strings"
)

// Network represents a private network for instances to connect to
type Network struct {
	ID      string `json:"id"`
	Name    string `json:"name,omitempty"`
	Default bool   `json:"default,omitempty"`
	CIDR    string `json:"cidr,omitempty"`
	Label   string `json:"label,omitempty"`
	Status  string `json:"status,omitempty"`
}

type networkConfig struct {
	Label  string `json:"label"`
	Region string `json:"region"`
}

// NetworkResult represents the result from a network create/update call
type NetworkResult struct {
	ID     string `json:"id"`
	Label  string `json:"label"`
	Result string `json:"result"`
}

// GetDefaultNetwork finds the default private network for an account
func (c *Client) GetDefaultNetwork() (*Network, error) {
	resp, err := c.SendGetRequest("/v2/networks")
	if err != nil {
		return nil, decodeError(err)
	}

	networks := make([]Network, 0)
	json.NewDecoder(bytes.NewReader(resp)).Decode(&networks)
	for _, network := range networks {
		if network.Default {
			return &network, nil
		}
	}

	return nil, errors.New("no default network found")
}

// NewNetwork creates a new private network
func (c *Client) NewNetwork(label string) (*NetworkResult, error) {
	nc := networkConfig{Label: label, Region: c.Region}
	body, err := c.SendPostRequest("/v2/networks", nc)
	if err != nil {
		return nil, decodeError(err)
	}

	var result = &NetworkResult{}
	if err := json.NewDecoder(bytes.NewReader(body)).Decode(result); err != nil {
		return nil, err
	}

	return result, nil
}

// ListNetworks list all private networks
func (c *Client) ListNetworks() ([]Network, error) {
	resp, err := c.SendGetRequest("/v2/networks")
	if err != nil {
		return nil, decodeError(err)
	}

	networks := make([]Network, 0)
	if err := json.NewDecoder(bytes.NewReader(resp)).Decode(&networks); err != nil {
		return nil, err
	}

	return networks, nil
}

// FindNetwork finds a network by either part of the ID or part of the name
func (c *Client) FindNetwork(search string) (*Network, error) {
	networks, err := c.ListNetworks()
	if err != nil {
		return nil, decodeError(err)
	}

	exactMatch := false
	partialMatchesCount := 0
	result := Network{}

	for _, value := range networks {
		if value.Name == search || value.ID == search || value.Label == search {
			exactMatch = true
			result = value
		} else if strings.Contains(value.Name, search) || strings.Contains(value.ID, search) || strings.Contains(value.Label, search) {
			if !exactMatch {
				result = value
				partialMatchesCount++
			}
		}
	}

	if exactMatch || partialMatchesCount == 1 {
		return &result, nil
	} else if partialMatchesCount > 1 {
		err := fmt.Errorf("unable to find %s because there were multiple matches", search)
		return nil, MultipleMatchesError.wrap(err)
	} else {
		err := fmt.Errorf("unable to find %s, zero matches", search)
		return nil, ZeroMatchesError.wrap(err)
	}
}

// RenameNetwork renames an existing private network
func (c *Client) RenameNetwork(label, id string) (*NetworkResult, error) {
	nc := networkConfig{Label: label, Region: c.Region}
	body, err := c.SendPutRequest("/v2/networks/"+id, nc)
	if err != nil {
		return nil, decodeError(err)
	}

	var result = &NetworkResult{}
	if err := json.NewDecoder(bytes.NewReader(body)).Decode(result); err != nil {
		return nil, err
	}

	return result, nil
}

// DeleteNetwork deletes a private network
func (c *Client) DeleteNetwork(id string) (*SimpleResponse, error) {
	resp, err := c.SendDeleteRequest(fmt.Sprintf("/v2/networks/%s", id))
	if err != nil {
		return nil, decodeError(err)
	}

	return c.DecodeSimpleResponse(resp)
}