package loxgo

import (
	"errors"
	"fmt"
	"os"
	"time"

	"git.red-panda.pet/pandaware/lox-go/lexer"
	"git.red-panda.pet/pandaware/lox-go/parser"
	"git.red-panda.pet/pandaware/lox-go/reporter"
	"git.red-panda.pet/pandaware/lox-go/runtime"
)

func RunFile(filename string) error {
	bs, err := os.ReadFile(filename)
	if err != nil {
		return err
	}

	if err := Run(string(bs)); err != nil {
		return err
	}

	return nil
}

func Run(source string) error {
	s := lexer.New(source)

	lexStart := time.Now()
	tokens, ok := s.ScanTokens()
	lexDuration := time.Since(lexStart)

	if !ok {
		return errors.New("lexer error")
	}

	p := parser.New(tokens)

	parseStart := time.Now()
	expr, err := p.Parse()
	parseDuration := time.Since(parseStart)

	if err != nil {
		return errors.New("parser error")
	}

	interpreter := runtime.NewInterpreter()

	evalStart := time.Now()
	reporter.Info(1, "interpreter", "repl", interpreter.Evaluate(expr).Debug())
	evalDuration := time.Since(evalStart)

	fmt.Println("")
	reporter.Debug(-1, "lexer", "repl", fmt.Sprintf("took %s", lexDuration))
	reporter.Debug(-1, "parser", "repl", fmt.Sprintf("took %s", parseDuration))
	reporter.Debug(-1, "interp", "repl", fmt.Sprintf("took %s", evalDuration))

	return nil
}