package namespace

import (
	"caj-larsson/bog/dataswamp/namespace"
	"context"
	"database/sql"
	"github.com/mattn/go-sqlite3"
	"time"
)

var _ = sqlite3.ErrError

type Repository struct {
	db *sql.DB
}

func (r *Repository) migrate() error {
	query := `
CREATE TABLE IF NOT EXISTS file_stats(
  id INTEGER PRIMARY KEY,
  num BIGINT NOT NULL,
  size_b BIGINT NOT NULL
);`
	_, err := r.db.Exec(query)
	if err != nil {
		return err
	}

	query = `
CREATE TABLE IF NOT EXISTS namespace(
  id INTEGER PRIMARY KEY,
  name TEXT NOT NULL UNIQUE,
  lastseen TEXT,
  allowance_time BIGINT,
  quota_kb BIGINT,
  quota_usage_kb BIGINT,
  usage_id BIGINT NOT NULL REFERENCES file_stats(Id),
  download_id BIGINT NOT NULL REFERENCES file_stats(Id),
  upload_id BIGINT NOT NULL REFERENCES file_stats(Id)
 );`
	_, err = r.db.Exec(query)

	return err
}

func NewRepository(filename string) namespace.Repository {
	db, err := sql.Open("sqlite3", filename)
	if err != nil {
		panic(err)
	}

	repo := Repository{
		db: db,
	}

	repo.migrate()
	return &repo
}

func (q *Queries) createFileStats(ctx context.Context, fstat namespace.FileStat) (int64, error) {
	return q.CreateFileStats(ctx, CreateFileStatsParams{fstat.Num, fstat.SizeB})
}

func (r *Repository) Create(ns namespace.Namespace) (*namespace.Namespace, error) {
	ctx := context.Background()
	q := New(r.db)
	u_id, err := q.createFileStats(ctx, ns.Usage)

	if err != nil {
		return nil, err
	}

	dl_id, err := q.createFileStats(ctx, ns.Download)

	if err != nil {
		return nil, err
	}

	ul_id, err := q.createFileStats(ctx, ns.Upload)

	if err != nil {
		return nil, err
	}

	ns.LastSeen = ns.LastSeen.Round(time.Microsecond)

	p := CreateNamespaceParams{
		Name:          ns.Name,
		Lastseen:      ns.LastSeen.UnixMicro(),
		AllowanceTime: sql.NullInt64{int64(ns.AllowanceDuration.Seconds()), true},
		QuotaKb:       sql.NullInt64{int64(ns.FileQuota.AllowanceKB), true},
		QuotaUsageKb:  sql.NullInt64{int64(ns.FileQuota.CurrentUsage), true},
		UsageID:       u_id,
		DownloadID:    dl_id,
		UploadID:      ul_id,
	}

	id, err := q.CreateNamespace(ctx, p)

	if err != nil {
		return nil, err
	}

	ns.ID = id
	return &ns, nil
}

func (r *Repository) All() ([]namespace.Namespace, error) {
	ctx := context.Background()
	q := New(r.db)
	rows, err := q.AllNamespaces(ctx)

	if err != nil {
		return nil, err
	}

	var all []namespace.Namespace
	for _, row := range rows {
		ns := namespace.Namespace{
			row.ID,
			row.Name,
			time.UnixMicro(row.Lastseen),
			time.Duration(row.AllowanceTime.Int64 * int64(time.Second)),
			namespace.FileSizeQuota{row.QuotaKb.Int64, row.QuotaUsageKb.Int64},
			namespace.FileStat{row.UNum, row.USizeB},
			namespace.FileStat{row.DNum, row.DSizeB},
			namespace.FileStat{row.UlNum, row.UlSizeB},
		}

		all = append(all, ns)
	}

	return all, nil
}

func (r *Repository) GetByName(name string) (*namespace.Namespace, error) {
	ctx := context.Background()
	q := New(r.db)
	row, err := q.GetNamespaceByName(ctx, name)

	if err != nil {
		return nil, namespace.ErrNotExists
	}

	ns := namespace.Namespace{
		row.ID,
		row.Name,
		time.UnixMicro(row.Lastseen),
		time.Duration(row.AllowanceTime.Int64 * int64(time.Second)),
		namespace.FileSizeQuota{row.QuotaKb.Int64, row.QuotaUsageKb.Int64},
		namespace.FileStat{row.UNum, row.USizeB},
		namespace.FileStat{row.DNum, row.DSizeB},
		namespace.FileStat{row.UlNum, row.UlSizeB},
	}

	return &ns, nil
}

func (q *Queries) updateFileStat(ctx context.Context, id int64, fstat namespace.FileStat) error {
	return q.UpdateFileStat(ctx, UpdateFileStatParams{fstat.Num, fstat.SizeB, id})
}

func (r *Repository) Update(id int64, ns namespace.Namespace) (*namespace.Namespace, error) {
	ctx := context.Background()
	q := New(r.db)

	ids, err := q.UpdateNamespace(ctx, UpdateNamespaceParams{
		ns.Name,
		ns.LastSeen.Round(time.Microsecond).UnixMicro(),
		sql.NullInt64{int64(ns.AllowanceDuration.Seconds()), true},
		sql.NullInt64{int64(ns.FileQuota.AllowanceKB), true},
		sql.NullInt64{int64(ns.FileQuota.CurrentUsage), true},
		ns.ID,
	})

	err = q.updateFileStat(ctx, ids.UsageID, ns.Usage)
	if err != nil {
		return nil, err
	}

	err = q.updateFileStat(ctx, ids.DownloadID, ns.Download)
	if err != nil {
		return nil, err
	}

	err = q.updateFileStat(ctx, ids.UploadID, ns.Upload)
	if err != nil {
		return nil, err
	}

	return &ns, nil
}

func (r *Repository) Delete(id int64) error {
	ctx := context.Background()
	q := New(r.db)

	err := q.DeleteNameSpace(ctx, id)
	if err != nil {
		return namespace.ErrDeleteFailed
	}

	return nil
}