package mailcow

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"log/slog"
	"net/http"
	"os"
	"time"

	"code.lila.network/adoralaura/mailcow-admin-aliases/internal/configuration"
)

type MailcowAlias struct {
	ID             int    `json:"id"`
	Domain         string `json:"domain"`
	PublicComment  string `json:"public_comment"`
	PrivateComment string `json:"private_comment"`
	Goto           string `json:"goto"`
	Address        string `json:"address"`
	IsCatchAll     int    `json:"is_catch_all"`
	Active         int    `json:"active"`
	ActiveInt      int    `json:"active_int"`
	SogoVisible    int    `json:"sogo_visible"`
	SogoVisibleInt int    `json:"sogo_visible_int"`
}

func NewAlias(alias string, destination string) MailcowAlias {
	var a MailcowAlias
	a.Active = 1
	a.PublicComment = "automatically generated by the mail server admin"
	a.PrivateComment = "automatically generated by the mail server admin"
	a.Address = alias
	a.Goto = destination
	a.SogoVisible = 0

	return a
}

func LoadAliases(cfg configuration.Config) ([]MailcowAlias, []string, error) {
	var aliases []MailcowAlias
	var aliasSlice []string

	url := cfg.ApiEndpoint + configuration.AllAliasesApiEndpoint
	method := "GET"

	client := &http.Client{Timeout: 10 * time.Second}
	req, err := http.NewRequest(method, url, nil)

	slog.Debug("alias request", "method", method, "url", url)

	if err != nil {
		return []MailcowAlias{}, []string{}, fmt.Errorf("failed to create alias http request: %w", err)
	}
	req.Header.Add("accept", "application/json")
	req.Header.Add("X-API-Key", cfg.ApiKey)

	res, err := client.Do(req)
	if err != nil {
		return []MailcowAlias{}, []string{}, fmt.Errorf("failed to request aliases from server: %w", err)
	}
	defer res.Body.Close()

	slog.Debug("alias response received", "status", res.Status, "status-code", res.StatusCode)

	if res.StatusCode != 200 {
		slog.Error("API request unsuccessful", "status", res.Status, "status-code", res.StatusCode)
		os.Exit(1)
	}

	body, err := io.ReadAll(res.Body)
	if err != nil {
		return []MailcowAlias{}, []string{}, fmt.Errorf("failed to read alias request body: %w", err)
	}

	err = json.Unmarshal(body, &aliases)
	if err != nil {
		return []MailcowAlias{}, []string{}, fmt.Errorf("failed to unmarshal alias request body: %w", err)
	}

	for _, alias := range aliases {
		aliasSlice = append(aliasSlice, alias.Address)
	}

	return aliases, aliasSlice, nil
}

func (a MailcowAlias) Create(cfg configuration.Config) error {
	url := cfg.ApiEndpoint + configuration.AliasAddApiEndpoint
	method := "POST"

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

	client := &http.Client{Timeout: 10 * time.Second}
	req, err := http.NewRequest(method, url, bytes.NewReader(payload))
	if err != nil {
		return fmt.Errorf("failed to create new POST request: %w", err)
	}

	slog.Debug("alias create request", "method", method, "url", url)

	req.Header.Add("accept", "application/json")
	req.Header.Add("Content-Type", "application/json")
	req.Header.Add("X-API-Key", cfg.ApiKey)

	res, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("failed to POST new alias to server: %w", err)
	}
	defer res.Body.Close()

	body, err := io.ReadAll(res.Body)
	if err != nil {
		return fmt.Errorf("failed to read response body: %w", err)
	}

	err = checkApiResponseOK(body)
	if err != nil {
		return fmt.Errorf("api returned an error: %w", err)
	}

	return nil
}