package zim

import (
	"path/filepath"
	"reflect"
	"runtime"
	"testing"

	"github.com/pkg/errors"
)

var testCases = []func(t *testing.T, z *ZimReader){
	testOpen,
	testData,
	testDisplayArticle,
	testDisplayInfost,
	testFavicon,
	testListArticles,
	testMainPage,
	testMetadata,
	testMime,
	testURLAtIdx,
}

func TestZim(t *testing.T) {
	zimFiles, err := filepath.Glob("testdata/*.zim")
	if err != nil {
		t.Fatalf("%+v", errors.WithStack(err))
	}

	for _, zf := range zimFiles {
		zr, err := NewReader(zf)
		if err != nil {
			t.Fatalf("%+v", errors.WithStack(err))
		}

		base := filepath.Base(zf)

		t.Run(base, func(t *testing.T) {
			for _, fn := range testCases {
				testName := runtime.FuncForPC(reflect.ValueOf(fn).Pointer()).Name()
				t.Run(testName, func(t *testing.T) {
					fn(t, zr)
				})
			}
		})
	}
}

func testOpen(t *testing.T, zr *ZimReader) {
	if zr.ArticleCount == 0 {
		t.Errorf("No article found")
	}
}

func testMime(t *testing.T, zr *ZimReader) {
	if len(zr.MimeTypes()) == 0 {
		t.Errorf("No mime types found")
	}
}

func testDisplayInfost(t *testing.T, zr *ZimReader) {
	info := zr.String()
	if len(info) < 0 {
		t.Errorf("Can't read infos")
	}
	t.Log(info)
}

func testURLAtIdx(t *testing.T, zr *ZimReader) {
	// addr 0 is a redirect
	p, _ := zr.OffsetAtURLIdx(5)
	a, _ := zr.ArticleAt(p)
	if a == nil {
		t.Errorf("Can't find 1st url")
	}
}

func testDisplayArticle(t *testing.T, zr *ZimReader) {
	// addr 0 is a redirect
	p, _ := zr.OffsetAtURLIdx(5)
	a, _ := zr.ArticleAt(p)
	if a == nil {
		t.Errorf("Can't find 1st url")
	}

	t.Log(a)
}

func testListArticles(t *testing.T, zr *ZimReader) {
	if testing.Short() {
		t.Skip("skipping test in short mode.")
	}

	var i uint32

	for a := range zr.ListArticles() {
		i++
		t.Log(a.String())
	}

	if i == 0 {
		t.Errorf("Can't find any urls")
	}

	if i != zr.ArticleCount-1 {
		t.Errorf("Can't find the exact ArticleCount urls %d vs %d", i, zr.ArticleCount)
	}
}

func testMainPage(t *testing.T, zr *ZimReader) {
	a, _ := zr.MainPage()
	if a == nil {
		t.Errorf("Can't find the mainpage article")
	}

	t.Log(a)
}

func testFavicon(t *testing.T, zr *ZimReader) {
	favicon, err := zr.Favicon()
	if err != nil {
		t.Errorf("%+v", errors.WithStack(err))
	}
	if favicon == nil {
		t.Errorf("Can't find the favicon article")
	}
}

func testMetadata(t *testing.T, zr *ZimReader) {
	metadata, err := zr.Metadata()
	if err != nil {
		t.Errorf("%+v", errors.WithStack(err))
	}
	if metadata == nil {
		t.Errorf("Can't find the metadata")
	}
}

func testData(t *testing.T, zr *ZimReader) {
	// addr 0 is a redirect
	p, _ := zr.OffsetAtURLIdx(5)
	a, _ := zr.ArticleAt(p)
	b, _ := a.Data()
	data := string(b)
	if a.EntryType != RedirectEntry {
		if len(data) == 0 {
			t.Error("can't read data")
		}
	}
	t.Log(a.String())
	t.Log(data)
}