//nolint:dupl // Active Record pattern - similar structure to label.go is intentional
package models

import (
	"context"
	"database/sql"
	"errors"
	"fmt"

	"git.eeqj.de/sneak/upaas/internal/database"
)

// EnvVar represents an environment variable for an app.
type EnvVar struct {
	db *database.Database

	ID    int64
	AppID string
	Key   string
	Value string
}

// NewEnvVar creates a new EnvVar with a database reference.
func NewEnvVar(db *database.Database) *EnvVar {
	return &EnvVar{db: db}
}

// Save inserts or updates the env var in the database.
func (e *EnvVar) Save(ctx context.Context) error {
	if e.ID == 0 {
		return e.insert(ctx)
	}

	return e.update(ctx)
}

// Delete removes the env var from the database.
func (e *EnvVar) Delete(ctx context.Context) error {
	_, err := e.db.Exec(ctx, "DELETE FROM app_env_vars WHERE id = ?", e.ID)

	return err
}

func (e *EnvVar) insert(ctx context.Context) error {
	query := "INSERT INTO app_env_vars (app_id, key, value) VALUES (?, ?, ?)"

	result, err := e.db.Exec(ctx, query, e.AppID, e.Key, e.Value)
	if err != nil {
		return err
	}

	id, err := result.LastInsertId()
	if err != nil {
		return err
	}

	e.ID = id

	return nil
}

func (e *EnvVar) update(ctx context.Context) error {
	query := "UPDATE app_env_vars SET key = ?, value = ? WHERE id = ?"

	_, err := e.db.Exec(ctx, query, e.Key, e.Value, e.ID)

	return err
}

// FindEnvVar finds an env var by ID.
//
//nolint:nilnil // returning nil,nil is idiomatic for "not found" in Active Record
func FindEnvVar(
	ctx context.Context,
	db *database.Database,
	id int64,
) (*EnvVar, error) {
	envVar := NewEnvVar(db)

	row := db.QueryRow(ctx,
		"SELECT id, app_id, key, value FROM app_env_vars WHERE id = ?",
		id,
	)

	err := row.Scan(&envVar.ID, &envVar.AppID, &envVar.Key, &envVar.Value)
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			return nil, nil
		}

		return nil, fmt.Errorf("scanning env var: %w", err)
	}

	return envVar, nil
}

// FindEnvVarsByAppID finds all env vars for an app.
func FindEnvVarsByAppID(
	ctx context.Context,
	db *database.Database,
	appID string,
) ([]*EnvVar, error) {
	query := `
		SELECT id, app_id, key, value FROM app_env_vars
		WHERE app_id = ? ORDER BY key`

	rows, err := db.Query(ctx, query, appID)
	if err != nil {
		return nil, fmt.Errorf("querying env vars by app: %w", err)
	}

	defer func() { _ = rows.Close() }()

	var envVars []*EnvVar

	for rows.Next() {
		envVar := NewEnvVar(db)

		scanErr := rows.Scan(
			&envVar.ID, &envVar.AppID, &envVar.Key, &envVar.Value,
		)
		if scanErr != nil {
			return nil, scanErr
		}

		envVars = append(envVars, envVar)
	}

	return envVars, rows.Err()
}

// DeleteEnvVarsByAppID deletes all env vars for an app.
func DeleteEnvVarsByAppID(
	ctx context.Context,
	db *database.Database,
	appID string,
) error {
	_, err := db.Exec(ctx, "DELETE FROM app_env_vars WHERE app_id = ?", appID)

	return err
}