package api

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestIsAcceptedExtension_AllSupported(t *testing.T) {
	supported := []string{
		".pdf", ".tiff", ".tif", ".jpeg", ".jpg",
		".png", ".bmp", ".docx", ".xlsx",
		".pptx", ".txt", ".eml",
	}

	for _, ext := range supported {
		t.Run(ext, func(t *testing.T) {
			assert.True(t, isAcceptedExtension("document"+ext),
				"expected %s to be accepted", ext)
		})
	}
}

func TestIsAcceptedExtension_CaseInsensitive(t *testing.T) {
	cases := []struct {
		filename string
	}{
		{"report.PDF"},
		{"image.Png"},
		{"file.DOCX"},
		{"scan.TiFf"},
		{"mail.EML"},
	}

	for _, tc := range cases {
		t.Run(tc.filename, func(t *testing.T) {
			assert.True(t, isAcceptedExtension(tc.filename),
				"expected %s to be accepted (case insensitive)", tc.filename)
		})
	}
}

func TestIsAcceptedExtension_Unsupported(t *testing.T) {
	unsupported := []struct {
		filename string
	}{
		{"virus.exe"},
		{"library.dll"},
		{"outlook.msg"},
		{"legacy.doc"},
		{"old.xls"},
		{"slides.ppt"},
		{"archive.zip"},
		{"data.csv"},
		{"page.html"},
		{"macros.docm"},
		{"macros.xlsm"},
		{"macros.pptm"},
	}

	for _, tc := range unsupported {
		t.Run(tc.filename, func(t *testing.T) {
			assert.False(t, isAcceptedExtension(tc.filename),
				"expected %s to be rejected", tc.filename)
		})
	}
}

func TestIsAcceptedExtension_NoExtension(t *testing.T) {
	assert.False(t, isAcceptedExtension("README"),
		"file with no extension should be rejected")
	assert.False(t, isAcceptedExtension("Makefile"),
		"file with no extension should be rejected")
}

func TestIsAcceptedExtension_WithPath(t *testing.T) {
	cases := []struct {
		name     string
		filename string
		want     bool
	}{
		{"nested pdf", "folder/document.pdf", true},
		{"deep path docx", "a/b/c/report.docx", true},
		{"nested unsupported", "folder/file.exe", false},
		{"path with spaces", "my folder/scan.png", true},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got := isAcceptedExtension(tc.filename)
			assert.Equal(t, tc.want, got,
				"isAcceptedExtension(%q) = %v, want %v", tc.filename, got, tc.want)
		})
	}
}