package main

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

	"codeberg.org/vlbeaudoin/voki/v3"
	"github.com/spf13/viper"
)

type API struct {
	Voki *voki.Voki
}

// NewAPIClientFromViper returns a pointer to a new API object,
// provided the configuration options are managed by
// https://git.agecem.com/agecem/agecem-org/config
func NewAPIClientFromViper(client *http.Client) (api *API, err error) {
	var config Config
	if err = viper.Unmarshal(&config); err != nil {
		return nil, err
	}

	return NewAPIClient(client, config.Server.Api.Host, config.Server.Api.Key, config.Server.Api.Port, config.Server.Api.Protocol)
}

func NewAPIClient(client *http.Client, host, key string, port int, protocol string) (*API, error) {
	return &API{Voki: voki.New(client, host, key, port, protocol)}, nil
}

func (a *API) UploadDocuments(bucketName string, fileHeaders ...*multipart.FileHeader) (response CreateDocumentsResponse, err error) {
	if count := len(fileHeaders); count == 0 {
		err = fmt.Errorf("api.(*API).UploadDocuments requiert au moins 1 fichier")
		return
	}

	endpoint := fmt.Sprintf("%s://%s:%d/v1/bucket/%s/many",
		a.Voki.Protocol,
		a.Voki.Host,
		a.Voki.Port,
		bucketName,
	)

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

	// Add files to the request
	for i, fileHeader := range fileHeaders {
		if fileHeader == nil {
			return response, fmt.Errorf("Fichier %d pointe vers une addresse mémoire nulle", i)
		}

		file, err := fileHeader.Open()
		if err != nil {
			return response, fmt.Errorf("Impossible de lire le contenu du fichier %d '%s': %s", i, fileHeader.Filename, err)
		}
		defer file.Close()

		fileName, err := url.QueryUnescape(fileHeader.Filename)
		if err != nil {
			return response, fmt.Errorf("Fichier %d '%s' a un nom invalide et impossible à convertir: %s", i, fileHeader.Filename, err)
		}

		part, err := writer.CreatePart(fileHeader.Header)
		if err != nil {
			return response, fmt.Errorf("Impossible d'ajouter %d '%s' au formulaire de téléversement: %s", i, fileName, err)
		}

		_, err = io.Copy(part, file)
		if err != nil {
			return response, fmt.Errorf("Impossible d'ajouter le contenu de %d '%s' au formulaire de téléversement: %s", i, fileName, err)
		}
	}

	if err := writer.Close(); err != nil {
		return response, fmt.Errorf("Impossible de fermer le io.Writer: %s", err)
	}

	req, err := http.NewRequest(http.MethodPost, endpoint, body)
	if err != nil {
		return response, fmt.Errorf("Impossible de produire une requête: %s", err)
	}

	if err := req.ParseForm(); err != nil {
		return response, fmt.Errorf("Impossible de parse le formulaire: %s", err)
	}

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

	if a.Voki.Key != "" {
		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", a.Voki.Key))
	}

	// Send the HTTP request
	httpResponse, err := a.Voki.Client.Do(req)
	if err != nil {
		return response, fmt.Errorf("Impossible d'exécuter la requête http: %s", err)
	}
	defer httpResponse.Body.Close()

	return response, json.NewDecoder(httpResponse.Body).Decode(&response)
}

func (a *API) UploadDocument(bucket string, file_header *multipart.FileHeader) (response CreateDocumentResponse, err error) {
	endpoint := fmt.Sprintf("%s://%s:%d",
		a.Voki.Protocol,
		a.Voki.Host,
		a.Voki.Port,
	)

	current_url := fmt.Sprintf("%s/v1/bucket/%s", endpoint, bucket)

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

	// Add the file to the request
	file, err := file_header.Open()
	if err != nil {
		return response, fmt.Errorf("UploadDocument#file_header.Open: %s", err)
	}
	defer file.Close()

	filename_processed, err := url.QueryUnescape(file_header.Filename)
	if err != nil {
		return response, fmt.Errorf("UploadDocument#url.QueryUnescape: %s", err)
	}

	part, err := writer.CreateFormFile("document", filename_processed)
	if err != nil {
		return response, fmt.Errorf("UploadDocument#writer.CreateFormFile: %s", err)
	}

	_, err = io.Copy(part, file)
	if err != nil {
		return response, fmt.Errorf("UploadDocument#io.Copy: %s", err)
	}

	err = writer.Close()
	if err != nil {
		return response, fmt.Errorf("UploadDocument#writer.Close: %s", err)
	}

	// Create a new HTTP request with the multipart body
	req, err := http.NewRequest(http.MethodPost, current_url, body)
	if err != nil {
		return response, fmt.Errorf("UploadDocument#http.NewRequest: %s", err)
	}

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

	if a.Voki.Key != "" {
		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", a.Voki.Key))
	}

	// Send the HTTP request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		return response, fmt.Errorf("UploadDocument#client.Do: %s", err)
	}
	defer resp.Body.Close()

	err = json.NewDecoder(resp.Body).Decode(&response)
	return response, err
}

func (a *API) ListBuckets() (response ListBucketsResponse, err error) {
	return response, a.Voki.Unmarshal(http.MethodGet, "/v1/bucket", nil, true, &response)
}

func (a *API) Seed() (response ExecuteSeedResponse, err error) {
	request, err := NewV1SeedPOST()
	if err != nil {
		return
	}

	return request.Request(a.Voki)
}