package main

import (
	"code.gitea.io/sdk/gitea"
	"fmt"
	"github.com/sirupsen/logrus"
	"net/http"
	"os"
	"path/filepath"
	"strings"
)

type (
	Repo struct {
		Owner string
		Name  string
	}
	Pr struct {
		Index int64
	}
	Build struct {
		Event string
	}
	Config struct {
		APIKey           string
		MessageText      string
		MessageFile      string
		BaseURl          string
		DeleteIdentifier string
	}
	Plugin struct {
		Repo   Repo
		Pr     Pr
		Build  Build
		Config Config
	}
)

func (p Plugin) Exec() error {

	if p.Build.Event != "pull_request" {
		return fmt.Errorf("only pull request may trigger this plugin. (was %s)", p.Build.Event)
	}

	if p.Config.APIKey == "" {
		return fmt.Errorf("you must provide an API key")
	}

	if p.Config.BaseURl == "" {
		return fmt.Errorf("you must provide the repo's base url")
	}

	if !strings.HasSuffix(p.Config.BaseURl, "/") {
		p.Config.BaseURl = p.Config.BaseURl + "/"
	}

	if p.Pr.Index == 0 {
		return fmt.Errorf("pull request number is not set")
	}

	var content []byte
	if p.Config.MessageText == "" {
		if p.Config.MessageFile == "" {
			return fmt.Errorf("you must provide either a message text or a message file")
		}

		glob, err := filepath.Glob(p.Config.MessageFile)
		if err != nil {
			return fmt.Errorf("failed to glob %s. %s", p.Config.MessageFile, err)
		}

		if len(glob) == 0 {
			return fmt.Errorf("no file found matching %s", p.Config.MessageFile)
		}

		content, err = os.ReadFile(glob[0])
		if err != nil {
			return fmt.Errorf("failed to read the file %s. %s", glob[0], err)
		}

	} else {
		if p.Config.MessageFile != "" {
			return fmt.Errorf("you must provide either a message text or a message file, not both")
		}
		content = []byte(p.Config.MessageText)
	}

	logrus.WithFields(logrus.Fields{
		"repo.baseurl": p.Config.BaseURl,
		"repo.owner":   p.Repo.Owner,
		"repo.name":    p.Repo.Name,
		"pr.index":     p.Pr.Index,
	}).Info("Start message commenting")

	httpClient := &http.Client{}
	client, err := gitea.NewClient(p.Config.BaseURl, gitea.SetToken(p.Config.APIKey), gitea.SetHTTPClient(httpClient))

	mc := messageClient{
		Client:           client,
		Owner:            p.Repo.Owner,
		Repo:             p.Repo.Name,
		Index:            p.Pr.Index,
		Message:          string(content),
		DeleteIdentifier: p.Config.DeleteIdentifier,
	}

	_, err = mc.deletePreviousMessages()
	if err != nil {
		return fmt.Errorf("error deleting previous messages: %w", err)
	}

	logrus.Info("Sending message as PR comment...")
	_, _, err = mc.sendMessage()
	if err == nil {
		logrus.Info("Done.")
	}

	return err
}