package pongo2_test

import (
	"testing"

	"github.com/flosch/pongo2/v4"
	. "gopkg.in/check.v1"
)

// Hook up gocheck into the "go test" runner.
func Test(t *testing.T) { TestingT(t) }

type TestSuite struct {
	tpl *pongo2.Template
}

var (
	_          = Suite(&TestSuite{})
	testSuite2 = pongo2.NewSet("test suite 2", pongo2.MustNewLocalFileSystemLoader(""))
)

func parseTemplate(s string, c pongo2.Context) string {
	t, err := testSuite2.FromString(s)
	if err != nil {
		panic(err)
	}
	out, err := t.Execute(c)
	if err != nil {
		panic(err)
	}
	return out
}

func parseTemplateFn(s string, c pongo2.Context) func() {
	return func() {
		parseTemplate(s, c)
	}
}

func (s *TestSuite) TestMisc(c *C) {
	// Must
	// TODO: Add better error message (see issue #18)
	c.Check(
		func() { pongo2.Must(testSuite2.FromFile("template_tests/inheritance/base2.tpl")) },
		PanicMatches,
		`\[Error \(where: fromfile\) in .*template_tests[/\\]inheritance[/\\]doesnotexist.tpl | Line 1 Col 12 near 'doesnotexist.tpl'\] open .*template_tests[/\\]inheritance[/\\]doesnotexist.tpl: no such file or directory`,
	)

	// Context
	c.Check(parseTemplateFn("", pongo2.Context{"'illegal": nil}), PanicMatches, ".*not a valid identifier.*")

	// Registers
	c.Check(pongo2.RegisterFilter("escape", nil).Error(), Matches, ".*is already registered")
	c.Check(pongo2.RegisterTag("for", nil).Error(), Matches, ".*is already registered")

	// ApplyFilter
	v, err := pongo2.ApplyFilter("title", pongo2.AsValue("this is a title"), nil)
	if err != nil {
		c.Fatal(err)
	}
	c.Check(v.String(), Equals, "This Is A Title")
	c.Check(func() {
		_, err := pongo2.ApplyFilter("doesnotexist", nil, nil)
		if err != nil {
			panic(err)
		}
	}, PanicMatches, `\[Error \(where: applyfilter\)\] Filter with name 'doesnotexist' not found.`)
}

func (s *TestSuite) TestImplicitExecCtx(c *C) {
	tpl, err := pongo2.FromString("{{ ImplicitExec }}")
	if err != nil {
		c.Fatalf("Error in FromString: %v", err)
	}

	val := "a stringy thing"

	res, err := tpl.Execute(pongo2.Context{
		"Value": val,
		"ImplicitExec": func(ctx *pongo2.ExecutionContext) string {
			return ctx.Public["Value"].(string)
		},
	})

	if err != nil {
		c.Fatalf("Error executing template: %v", err)
	}

	c.Check(res, Equals, val)

	// The implicit ctx should not be persisted from call-to-call
	res, err = tpl.Execute(pongo2.Context{
		"ImplicitExec": func() string {
			return val
		},
	})

	if err != nil {
		c.Fatalf("Error executing template: %v", err)
	}

	c.Check(res, Equals, val)
}
