package repository

import (
	"context"
	"encoding/json"

	dbgen "Yimaru-Backend/gen/db"
	"Yimaru-Backend/internal/domain"

	"github.com/jackc/pgx/v5/pgtype"
)

/* =========================
   Create
   ========================= */

func (r *Store) CreateScheduledNotification(
	ctx context.Context,
	sn *domain.ScheduledNotification,
) (*domain.ScheduledNotification, error) {

	params := dbgen.CreateScheduledNotificationParams{
		Channel:       string(sn.Channel),
		Title:         pgtype.Text{String: sn.Title, Valid: sn.Title != ""},
		Message:       sn.Message,
		Html:          pgtype.Text{String: sn.HTML, Valid: sn.HTML != ""},
		ScheduledAt:   pgtype.Timestamptz{Time: sn.ScheduledAt, Valid: true},
		TargetUserIds: sn.TargetUserIDs,
		TargetRole:    pgtype.Text{String: sn.TargetRole, Valid: sn.TargetRole != ""},
		TargetRaw:     json.RawMessage(sn.TargetRaw),
		CreatedBy:     sn.CreatedBy,
	}

	dbRow, err := r.queries.CreateScheduledNotification(ctx, params)
	if err != nil {
		return nil, err
	}

	return mapScheduledDBToDomain(&dbRow), nil
}

/* =========================
   Read
   ========================= */

func (r *Store) GetScheduledNotification(
	ctx context.Context,
	id int64,
) (*domain.ScheduledNotification, error) {

	dbRow, err := r.queries.GetScheduledNotification(ctx, id)
	if err != nil {
		return nil, err
	}

	return mapScheduledDBToDomain(&dbRow), nil
}

func (r *Store) ListScheduledNotifications(
	ctx context.Context,
	filter domain.ScheduledNotificationFilter,
) ([]domain.ScheduledNotification, int64, error) {

	filterParams := dbgen.ListScheduledNotificationsParams{
		FilterStatus:  pgtype.Text{String: filter.Status, Valid: filter.Status != ""},
		FilterChannel: pgtype.Text{String: filter.Channel, Valid: filter.Channel != ""},
		PageLimit:     int32(filter.Limit),
		PageOffset:    int32(filter.Offset),
	}
	countParams := dbgen.CountScheduledNotificationsParams{
		FilterStatus:  filterParams.FilterStatus,
		FilterChannel: filterParams.FilterChannel,
	}

	if filter.After != nil {
		v := pgtype.Timestamptz{Time: *filter.After, Valid: true}
		filterParams.FilterAfter = v
		countParams.FilterAfter = v
	}
	if filter.Before != nil {
		v := pgtype.Timestamptz{Time: *filter.Before, Valid: true}
		filterParams.FilterBefore = v
		countParams.FilterBefore = v
	}

	rows, err := r.queries.ListScheduledNotifications(ctx, filterParams)
	if err != nil {
		return nil, 0, err
	}

	total, err := r.queries.CountScheduledNotifications(ctx, countParams)
	if err != nil {
		return nil, 0, err
	}

	result := make([]domain.ScheduledNotification, 0, len(rows))
	for _, row := range rows {
		result = append(result, *mapScheduledDBToDomain(&row))
	}

	return result, total, nil
}

/* =========================
   Update
   ========================= */

func (r *Store) CancelScheduledNotification(
	ctx context.Context,
	id int64,
) (*domain.ScheduledNotification, error) {

	dbRow, err := r.queries.CancelScheduledNotification(ctx, id)
	if err != nil {
		return nil, err
	}

	return mapScheduledDBToDomain(&dbRow), nil
}

func (r *Store) ClaimDueScheduledNotifications(
	ctx context.Context,
	limit int32,
) ([]domain.ScheduledNotification, error) {

	rows, err := r.queries.ClaimDueScheduledNotifications(ctx, limit)
	if err != nil {
		return nil, err
	}

	result := make([]domain.ScheduledNotification, 0, len(rows))
	for _, row := range rows {
		result = append(result, *mapScheduledDBToDomain(&row))
	}

	return result, nil
}

func (r *Store) MarkScheduledNotificationSent(
	ctx context.Context,
	id int64,
) error {
	return r.queries.MarkScheduledNotificationSent(ctx, id)
}

func (r *Store) MarkScheduledNotificationFailed(
	ctx context.Context,
	id int64,
	lastError string,
) error {
	return r.queries.MarkScheduledNotificationFailed(ctx, dbgen.MarkScheduledNotificationFailedParams{
		ID:        id,
		LastError: pgtype.Text{String: lastError, Valid: lastError != ""},
	})
}

/* =========================
   Mapping
   ========================= */

func mapScheduledDBToDomain(db *dbgen.ScheduledNotification) *domain.ScheduledNotification {
	sn := &domain.ScheduledNotification{
		ID:            db.ID,
		Channel:       domain.DeliveryChannel(db.Channel),
		Message:       db.Message,
		ScheduledAt:   db.ScheduledAt.Time,
		Status:        domain.ScheduledNotificationStatus(db.Status),
		TargetUserIDs: db.TargetUserIds,
		TargetRaw:     json.RawMessage(db.TargetRaw),
		AttemptCount:  db.AttemptCount,
		CreatedBy:     db.CreatedBy,
		CreatedAt:     db.CreatedAt.Time,
		UpdatedAt:     db.UpdatedAt.Time,
	}

	if db.Title.Valid {
		sn.Title = db.Title.String
	}
	if db.Html.Valid {
		sn.HTML = db.Html.String
	}
	if db.TargetRole.Valid {
		sn.TargetRole = db.TargetRole.String
	}
	if db.LastError.Valid {
		sn.LastError = db.LastError.String
	}
	if db.ProcessingStartedAt.Valid {
		t := db.ProcessingStartedAt.Time
		sn.ProcessingStartedAt = &t
	}
	if db.SentAt.Valid {
		t := db.SentAt.Time
		sn.SentAt = &t
	}
	if db.CancelledAt.Valid {
		t := db.CancelledAt.Time
		sn.CancelledAt = &t
	}

	return sn
}