package fetcher

import (
	"context"
	"errors"
	"fmt"
	"log/slog"
	"time"

	"git.avsdev.uk/Go/job-search/internal/config"
	"git.avsdev.uk/Go/job-search/internal/findatender"
	"git.avsdev.uk/Go/job-search/internal/types"
	"git.avsdev.uk/Go/job-search/internal/util"
)

// runFindAOpportunity polls Find a Tender every configured interval until ctx
// is cancelled.
func runFindAOpportunity(
	ctx context.Context, conf *config.JobSearchConfig, since time.Time,
) error {
	w := util.Worker{
		Name:     "FindAOpportunity",
		Interval: conf.Sources.FindATender.Interval,
		Task: func(ctx context.Context, since time.Time) error {
			return fetchFindAOpportunity(ctx, conf, since)
		},
	}
	return w.Run(ctx, since)
}

// fetchFindAOpportunity fetches everything updated since since from Find a
// Tender. Finding nothing returns ErrNoNewReleases, so the worker still moves
// its checkpoint on.
func fetchFindAOpportunity(
	ctx context.Context, conf *config.JobSearchConfig, since time.Time,
) error {
	opportunities, err := util.AwaitTask(ctx, func() ([]*types.Opportunity, error) {
		ft := findatender.New(conf, conf.Sources.FindATender.APIRoot)
		defer ft.Shutdown()
		return ft.With(ctx).FetchAll(since, true)
	})
	if errors.Is(err, findatender.ErrNoReleases) {
		return ErrNoNewReleases
	}
	if err != nil {
		return err
	}

	slog.Info(fmt.Sprintf("Found %d opportunities", len(opportunities)))

	return nil
}