package bnp

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// presentationFixture extends the codeless fixture with a root preview.png
// and a screenshots/ dir.
func presentationFixture(t *testing.T) string {
	t.Helper()
	dir := codelessFixture(t)
	writeFixture(t, dir, map[string]string{
		"preview.png":              "not-really-png-but-bytes",
		"screenshots/01-home.png":  "home-bytes",
		"screenshots/02-blog.jpg":  "blog-bytes",
		"screenshots/03-page.webp": "page-bytes",
	})
	return dir
}

func TestCodelessBuildPacksPresentationMembers(t *testing.T) {
	dir := presentationFixture(t)

	out := filepath.Join(t.TempDir(), "fixture-theme-0.1.0.bnp")
	res, err := BuildCodeless(context.Background(), BuildOptions{Dir: dir, Output: out})
	if err != nil {
		t.Fatalf("BuildCodeless: %v", err)
	}
	if !res.PreviewIncluded || res.ScreenshotCount != 3 {
		t.Errorf("result preview=%t screenshots=%d; want true/3", res.PreviewIncluded, res.ScreenshotCount)
	}
	found := false
	for _, d := range res.IncludedDirs {
		if d == dirScreenshots {
			found = true
		}
	}
	if !found {
		t.Errorf("IncludedDirs %v missing %q", res.IncludedDirs, dirScreenshots)
	}

	v, err := Verify(out)
	if err != nil {
		t.Fatalf("Verify: %v", err)
	}
	if !v.HasPreview || v.ScreenshotCount != 3 {
		t.Errorf("verify preview=%t screenshots=%d; want true/3", v.HasPreview, v.ScreenshotCount)
	}
}

func TestCodelessBuildWithoutPresentationMembers(t *testing.T) {
	dir := codelessFixture(t)
	out := filepath.Join(t.TempDir(), "fixture-theme-0.1.0.bnp")
	res, err := BuildCodeless(context.Background(), BuildOptions{Dir: dir, Output: out})
	if err != nil {
		t.Fatalf("BuildCodeless: %v", err)
	}
	if res.PreviewIncluded || res.ScreenshotCount != 0 {
		t.Errorf("result preview=%t screenshots=%d; want false/0", res.PreviewIncluded, res.ScreenshotCount)
	}
	v, err := Verify(out)
	if err != nil {
		t.Fatalf("Verify: %v", err)
	}
	if v.HasPreview || v.ScreenshotCount != 0 {
		t.Errorf("verify preview=%t screenshots=%d; want false/0", v.HasPreview, v.ScreenshotCount)
	}
}

func TestValidateScreenshotsDirRejections(t *testing.T) {
	build := func(t *testing.T, mutate func(dir string)) error {
		t.Helper()
		dir := codelessFixture(t)
		mutate(dir)
		out := filepath.Join(t.TempDir(), "out.bnp")
		_, err := BuildCodeless(context.Background(), BuildOptions{Dir: dir, Output: out})
		return err
	}

	t.Run("bad extension", func(t *testing.T) {
		err := build(t, func(dir string) {
			writeFixture(t, dir, map[string]string{"screenshots/readme.txt": "nope"})
		})
		if err == nil || !strings.Contains(err.Error(), "unsupported image type") {
			t.Fatalf("err = %v; want unsupported image type", err)
		}
	})

	t.Run("subdirectory", func(t *testing.T) {
		err := build(t, func(dir string) {
			writeFixture(t, dir, map[string]string{"screenshots/sub/x.png": "nope"})
		})
		if err == nil || !strings.Contains(err.Error(), "subdirectories are not allowed") {
			t.Fatalf("err = %v; want subdirectory rejection", err)
		}
	})

	t.Run("too many", func(t *testing.T) {
		err := build(t, func(dir string) {
			files := map[string]string{}
			for i := range maxScreenshotFiles + 1 {
				files[fmt.Sprintf("screenshots/%02d.png", i)] = "x"
			}
			writeFixture(t, dir, files)
		})
		if err == nil || !strings.Contains(err.Error(), "gallery cap") {
			t.Fatalf("err = %v; want gallery cap rejection", err)
		}
	})

	t.Run("oversized image", func(t *testing.T) {
		err := build(t, func(dir string) {
			big := filepath.Join(dir, dirScreenshots, "big.png")
			if mkErr := os.MkdirAll(filepath.Dir(big), 0o755); mkErr != nil {
				t.Fatal(mkErr)
			}
			f, cErr := os.Create(big)
			if cErr != nil {
				t.Fatal(cErr)
			}
			if tErr := f.Truncate(maxScreenshotBytes + 1); tErr != nil {
				t.Fatal(tErr)
			}
			_ = f.Close()
		})
		if err == nil || !strings.Contains(err.Error(), "per-image cap") {
			t.Fatalf("err = %v; want per-image cap rejection", err)
		}
	})

	t.Run("oversized preview", func(t *testing.T) {
		err := build(t, func(dir string) {
			big := filepath.Join(dir, filePreview)
			f, cErr := os.Create(big)
			if cErr != nil {
				t.Fatal(cErr)
			}
			if tErr := f.Truncate(maxScreenshotBytes + 1); tErr != nil {
				t.Fatal(tErr)
			}
			_ = f.Close()
		})
		if err == nil || !strings.Contains(err.Error(), "per-image cap") {
			t.Fatalf("err = %v; want per-image cap rejection", err)
		}
	})
}