package lua

import (
	"errors"
	"fmt"
	"path/filepath"

	"github.com/Jguer/yay/v13/pkg/text"
)

// Load loads path, applies its yay.opt values onto cfg, and returns the live engine.
func Load(logger *text.Logger, path string, cfg any) (*Engine, error) {
	var luaLogger *text.Logger
	if logger != nil {
		luaLogger = logger.Child("lua")
	}

	engine := NewWithLogger(luaLogger)
	engine.SetSearchDir(filepath.Dir(path))

	if err := engine.L.DoFile(path); err != nil {
		engine.Close()
		return nil, err
	}

	unknown, errs := engine.Apply(cfg)

	if len(unknown) == 0 && len(errs) == 0 {
		return engine, nil
	}

	var joinErrs []error

	for _, key := range unknown {
		joinErrs = append(joinErrs, fmt.Errorf("init.lua: unknown yay.opt key: %s", key))
	}

	for _, err := range errs {
		joinErrs = append(joinErrs, fmt.Errorf("init.lua: %w", err))
	}

	if err := errors.Join(joinErrs...); err != nil {
		engine.Close()
		return nil, err
	}

	return engine, nil
}

// LoadInto applies the yay.opt values from path onto cfg.
func LoadInto(logger *text.Logger, path string, cfg any) error {
	engine, err := Load(logger, path, cfg)
	if engine != nil {
		defer engine.Close()
	}

	return err
}