package webhook

import (
	"context"
	"database/sql"
	"time"

	"github.com/noderunners/nip05api/internal/db"
)

type Repo struct{ db *db.DB }

func NewRepo(d *db.DB) *Repo { return &Repo{db: d} }

func (r *Repo) Insert(ctx context.Context, eventType EventType, payload string) error {
	_, err := r.db.ExecContext(ctx, `INSERT INTO webhook_outbox
        (event_type, payload, next_attempt_at) VALUES (?, ?, ?)`,
		string(eventType), payload, time.Now().UTC().Format(time.RFC3339))
	return err
}

func (r *Repo) Claim(ctx context.Context, limit int) ([]*OutboxItem, error) {
	rows, err := r.db.QueryContext(ctx, `SELECT id, event_type, payload, attempts,
        last_attempt_at, next_attempt_at, status, COALESCE(last_error, ''), created_at
        FROM webhook_outbox
        WHERE status = 'pending' AND next_attempt_at <= ?
        ORDER BY next_attempt_at ASC LIMIT ?`,
		time.Now().UTC().Format(time.RFC3339), limit)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	out := []*OutboxItem{}
	for rows.Next() {
		var it OutboxItem
		var status, eventType string
		var lastAttempt, nextAttempt, created sql.NullString
		if err := rows.Scan(&it.ID, &eventType, &it.Payload, &it.Attempts,
			&lastAttempt, &nextAttempt, &status, &it.LastError, &created); err != nil {
			return nil, err
		}
		it.EventType = EventType(eventType)
		it.Status = Status(status)
		if lastAttempt.Valid {
			if t, err := time.Parse(time.RFC3339, lastAttempt.String); err == nil {
				it.LastAttemptAt = &t
			}
		}
		if nextAttempt.Valid {
			if t, err := time.Parse(time.RFC3339, nextAttempt.String); err == nil {
				it.NextAttemptAt = t
			}
		}
		if created.Valid {
			if t, err := time.Parse(time.RFC3339, created.String); err == nil {
				it.CreatedAt = t
			} else if t, err := time.Parse("2006-01-02 15:04:05", created.String); err == nil {
				it.CreatedAt = t
			}
		}
		out = append(out, &it)
	}
	return out, rows.Err()
}

func (r *Repo) MarkDelivered(ctx context.Context, id int64) error {
	_, err := r.db.ExecContext(ctx, `UPDATE webhook_outbox SET status = 'delivered',
        last_attempt_at = ?, last_error = '' WHERE id = ?`,
		time.Now().UTC().Format(time.RFC3339), id)
	return err
}

func (r *Repo) MarkRetry(ctx context.Context, id int64, attempts int, nextAt time.Time, errMsg string) error {
	_, err := r.db.ExecContext(ctx, `UPDATE webhook_outbox SET attempts = ?,
        last_attempt_at = ?, next_attempt_at = ?, last_error = ? WHERE id = ?`,
		attempts, time.Now().UTC().Format(time.RFC3339),
		nextAt.UTC().Format(time.RFC3339), errMsg, id)
	return err
}

func (r *Repo) MarkDead(ctx context.Context, id int64, errMsg string) error {
	_, err := r.db.ExecContext(ctx, `UPDATE webhook_outbox SET status = 'dead',
        last_attempt_at = ?, last_error = ? WHERE id = ?`,
		time.Now().UTC().Format(time.RFC3339), errMsg, id)
	return err
}