package acquire

import (
	"context"
	"fmt"

	"github.com/jackc/pgx/v5/pgxpool"

	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
	"git.fabledsword.com/bvandeusen/minstrel/internal/release"
)

// Build makes a Service from the settings as they stand: every enabled
// search source behind one paced Fanout, the first enabled download client,
// and the quality profile. Built afresh for each pass and each request, so a
// changed setting takes effect on the next one.
func Build(ctx context.Context, pool *pgxpool.Pool) (*Service, dbq.AcquisitionSetting, error) {
	q := dbq.New(pool)
	settings, err := q.GetAcquisitionSettings(ctx)
	if err != nil {
		return nil, settings, fmt.Errorf("acquire: read settings: %w", err)
	}
	sources, err := Sources(ctx, pool)
	if err != nil {
		return nil, settings, fmt.Errorf("acquire: read search sources: %w", err)
	}
	clients, err := q.ListUsableAcquisitionServices(ctx, JobDownload)
	if err != nil {
		return nil, settings, fmt.Errorf("acquire: read download clients: %w", err)
	}
	s := &Service{Profile: release.NewProfile(settings.AllowedQualities), Memory: NewMemory(pool)}
	fan := &Fanout{Sources: sources, Pace: SearchPace}
	if len(sources) > 0 {
		s.Search = fan
	}
	if len(clients) > 0 {
		row := clients[0]
		client, err := DownloadClient(row)
		if err != nil {
			return nil, settings, fmt.Errorf("acquire: download client %s: %w", row.Code, err)
		}
		s.Grabber = &Downloader{Client: client, Code: row.Code, Landing: row.LocalPath, Fetch: fan}
	}
	return s, settings, nil
}