package postgres

import (
	"context"
	"encoding/json"
	"fmt"

	"botpontos/internal/domain"
)

// GetSettings devolve as configurações globais (app_settings) como texto.
func (s *Store) GetSettings(ctx context.Context) (map[string]string, error) {
	rows, err := s.pool.Query(ctx, `SELECT key, value #>> '{}' FROM app_settings`)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	out := map[string]string{}
	for rows.Next() {
		var key string
		var value *string
		if err := rows.Scan(&key, &value); err != nil {
			return nil, err
		}
		if value != nil {
			out[key] = *value
		}
	}
	return out, rows.Err()
}

// SeedSettings grava os valores padrão que ainda não existem (primeira subida).
func (s *Store) SeedSettings(ctx context.Context, values map[string]string) error {
	return s.inTx(ctx, func(q querier) error {
		for key, value := range values {
			if _, err := q.Exec(ctx, `
				INSERT INTO app_settings (key, value) VALUES ($1, to_jsonb($2::text))
				ON CONFLICT (key) DO NOTHING`, key, value); err != nil {
				return err
			}
		}
		return nil
	})
}

func (s *Store) SaveSettings(ctx context.Context, values map[string]string, accountID *int64) error {
	return s.inTx(ctx, func(q querier) error {
		for key, value := range values {
			if _, err := q.Exec(ctx, `
				INSERT INTO app_settings (key, value, updated_by_account) VALUES ($1, to_jsonb($2::text), $3)
				ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_by_account = EXCLUDED.updated_by_account`,
				key, value, accountID); err != nil {
				return err
			}
		}
		return nil
	})
}

// GetState lê um estado operacional (service_state) para dentro de out.
func (s *Store) GetState(ctx context.Context, key string, out any) (bool, error) {
	var raw string
	err := s.pool.QueryRow(ctx, `SELECT value::text FROM service_state WHERE key = $1`, key).Scan(&raw)
	if err != nil {
		if mapErr(err) == domain.ErrNotFound {
			return false, nil
		}
		return false, err
	}
	if err := json.Unmarshal([]byte(raw), out); err != nil {
		return false, fmt.Errorf("service_state %s ilegível: %w", key, err)
	}
	return true, nil
}

func (s *Store) SetState(ctx context.Context, key string, value any) error {
	raw, err := json.Marshal(value)
	if err != nil {
		return err
	}
	_, err = s.pool.Exec(ctx, `
		INSERT INTO service_state (key, value) VALUES ($1, $2::text::jsonb)
		ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value`, key, string(raw))
	return err
}

func (s *Store) DeleteState(ctx context.Context, key string) error {
	_, err := s.pool.Exec(ctx, `DELETE FROM service_state WHERE key = $1`, key)
	return err
}