package pis

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"

	"git.fjla.uk/owlboard/timetable-mgr/dbAccess"
	"git.fjla.uk/owlboard/timetable-mgr/log"
	"go.uber.org/zap"
)

// Checks the Gitea API for the latest release and compares to metadata in the database
// to determine if a PIS update is required.
func Check() {
	log.Info("PIS Update Check started")
	repoName := "data"
	repoOwner := "owlboard"
	baseUrl := "https://git.fjla.uk"

	apiUrl := fmt.Sprintf("%s/api/v1/repos/%s/%s/releases/latest", baseUrl, repoOwner, repoName)

	log.Info("Initiating PIS Check")

	resp, err := http.Get(apiUrl)
	if err != nil {
		log.Error("Error GETting Gitea API", zap.Error(err))
		return
	}

	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		log.Error("Errot GETting Gitea API", zap.Error(fmt.Errorf("response status code %d", resp.StatusCode)))
		return
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		log.Error("Error reading API Response", zap.Error(err))
		return
	}

	var apiResp GiteaReleaseData
	err = json.Unmarshal(body, &apiResp)
	if err != nil {
		log.Error("Error unmarshalling API response", zap.Error(err))
		return
	}

	oldMetadata, err := dbAccess.GetPisMetadata()
	if err != nil {
		log.Error("Error reading PIS Metadata from database")
		return
	}

	if oldMetadata != nil {
		if oldMetadata.LastVersion != apiResp.Name {
			log.Info("PIS Data is up to date")
			return
		}
	}

	log.Info("PIS Data being updated")
	err = runUpdate(apiResp.TarballUrl)
	if err != nil {
		log.Error("Error updating PIS Data", zap.Error(err))
	}

	err = dbAccess.PutPisMetadata(apiResp.Name)
	if err != nil {
		log.Error("Error updating PIS Metadata", zap.Error(err))
	}
}