package parser_test

import (
	"testing"

	"github.com/d5/tengo/ast"
	"github.com/d5/tengo/token"
)

func TestFor(t *testing.T) {
	expect(t, "for {}", func(p pfn) []ast.Stmt {
		return stmts(
			forStmt(nil, nil, nil, blockStmt(p(1, 5), p(1, 6)), p(1, 1)))
	})

	expect(t, "for a == 5 {}", func(p pfn) []ast.Stmt {
		return stmts(
			forStmt(
				nil,
				binaryExpr(
					ident("a", p(1, 5)),
					intLit(5, p(1, 10)),
					token.Equal,
					p(1, 7)),
				nil,
				blockStmt(p(1, 12), p(1, 13)),
				p(1, 1)))
	})

	expect(t, "for a := 0; a == 5;  {}", func(p pfn) []ast.Stmt {
		return stmts(
			forStmt(
				assignStmt(
					exprs(ident("a", p(1, 5))),
					exprs(intLit(0, p(1, 10))),
					token.Define, p(1, 7)),
				binaryExpr(
					ident("a", p(1, 13)),
					intLit(5, p(1, 18)),
					token.Equal,
					p(1, 15)),
				nil,
				blockStmt(p(1, 22), p(1, 23)),
				p(1, 1)))
	})

	expect(t, "for a := 0; a < 5; a++ {}", func(p pfn) []ast.Stmt {
		return stmts(
			forStmt(
				assignStmt(
					exprs(ident("a", p(1, 5))),
					exprs(intLit(0, p(1, 10))),
					token.Define, p(1, 7)),
				binaryExpr(
					ident("a", p(1, 13)),
					intLit(5, p(1, 17)),
					token.Less,
					p(1, 15)),
				incDecStmt(
					ident("a", p(1, 20)),
					token.Inc, p(1, 21)),
				blockStmt(p(1, 24), p(1, 25)),
				p(1, 1)))
	})

	expect(t, "for ; a < 5; a++ {}", func(p pfn) []ast.Stmt {
		return stmts(
			forStmt(
				nil,
				binaryExpr(
					ident("a", p(1, 7)),
					intLit(5, p(1, 11)),
					token.Less,
					p(1, 9)),
				incDecStmt(
					ident("a", p(1, 14)),
					token.Inc, p(1, 15)),
				blockStmt(p(1, 18), p(1, 19)),
				p(1, 1)))
	})

	expect(t, "for a := 0; ; a++ {}", func(p pfn) []ast.Stmt {
		return stmts(
			forStmt(
				assignStmt(
					exprs(ident("a", p(1, 5))),
					exprs(intLit(0, p(1, 10))),
					token.Define, p(1, 7)),
				nil,
				incDecStmt(
					ident("a", p(1, 15)),
					token.Inc, p(1, 16)),
				blockStmt(p(1, 19), p(1, 20)),
				p(1, 1)))
	})

	expect(t, "for a == 5 && b != 4 {}", func(p pfn) []ast.Stmt {
		return stmts(
			forStmt(
				nil,
				binaryExpr(
					binaryExpr(
						ident("a", p(1, 5)),
						intLit(5, p(1, 10)),
						token.Equal,
						p(1, 7)),
					binaryExpr(
						ident("b", p(1, 15)),
						intLit(4, p(1, 20)),
						token.NotEqual,
						p(1, 17)),
					token.LAnd,
					p(1, 12)),
				nil,
				blockStmt(p(1, 22), p(1, 23)),
				p(1, 1)))
	})
}