package e2e

import (
	"net/url"
	"strconv"
	"strings"
	"testing"
)

// pageValidPatch is a minimal but well-formed format-patch file.
var pageValidPatch = strings.Join([]string{
	"From a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2 Mon Sep 17 00:00:00 2001",
	"From: Test User <test@example.com>",
	"Date: Mon, 01 Jan 2024 12:00:00 +0000",
	"Subject: [PATCH] Add f.txt",
	"",
	"---",
	"diff --git a/f.txt b/f.txt",
	"new file mode 100644",
	"index 0000000..9daeafb",
	"--- /dev/null",
	"+++ b/f.txt",
	"@@ -0,0 +1 @@",
	"+x",
	"",
}, "\n")

func TestPagination(t *testing.T) {
	e := newEnv(t)
	admin := e.admin()
	e.createRepo(admin, "paged-repo")

	// 21 issues and 21 patches each spill onto a second page at 20 per page.
	for i := 1; i <= 21; i++ {
		admin.post("/paged-repo/issues", url.Values{
			"title": {"Issue number " + strconv.Itoa(i)}, "body": {""},
		}).mustRedirect("/paged-repo/issues/")
	}
	for i := 1; i <= 21; i++ {
		admin.postMultipart("/paged-repo/patches",
			url.Values{"title": {"Patch number " + strconv.Itoa(i)}},
			file{Field: "patch_file", Name: "bulk.patch", Content: []byte(pageValidPatch)},
		).mustRedirect("/paged-repo/patches/")
	}

	t.Run("repo list page 1 shows repos and no pagination when few repos", func(t *testing.T) {
		if n := admin.get("/").Count(".repo-name"); n == 0 {
			t.Error("no repos listed")
		}
	})

	t.Run("issue list page 1 shows at most 20 items", func(t *testing.T) {
		if n := admin.get("/paged-repo/issues").Count(".issue-item"); n > 20 {
			t.Errorf("issues on page 1 = %d", n)
		}
	})

	t.Run("issue list pagination nav appears when more than 20 issues", func(t *testing.T) {
		if !admin.get("/paged-repo/issues").Has(".pagination") {
			t.Error("pagination missing")
		}
	})

	t.Run("issue list page 2 shows remaining issues", func(t *testing.T) {
		n := admin.get("/paged-repo/issues?page=2").Count(".issue-item")
		if n == 0 || n > 20 {
			t.Errorf("issues on page 2 = %d", n)
		}
	})

	t.Run("issue list page 2 prev link goes to page 1", func(t *testing.T) {
		href := admin.get("/paged-repo/issues?page=2").Attr(".pagination-prev .pagination-btn", "href")
		if !strings.Contains(href, "page=1") {
			t.Errorf("prev href = %q", href)
		}
	})

	t.Run("issue list page 1 next link goes to page 2", func(t *testing.T) {
		href := admin.get("/paged-repo/issues").Attr(".pagination-next .pagination-btn", "href")
		if !strings.Contains(href, "page=2") {
			t.Errorf("next href = %q", href)
		}
	})

	t.Run("patch list page 1 shows at most 20 items", func(t *testing.T) {
		if n := admin.get("/paged-repo/patches").Count(".issue-item"); n > 20 {
			t.Errorf("patches on page 1 = %d", n)
		}
	})

	t.Run("patch list pagination nav appears when more than 20 patches", func(t *testing.T) {
		if !admin.get("/paged-repo/patches").Has(".pagination") {
			t.Error("pagination missing")
		}
	})

	t.Run("patch list page 2 shows remaining patches", func(t *testing.T) {
		if n := admin.get("/paged-repo/patches?page=2").Count(".issue-item"); n == 0 {
			t.Error("no patches on page 2")
		}
	})

	t.Run("commit log with few commits shows no cursor nav", func(t *testing.T) {
		// paged-repo has no commits, so there is nothing to paginate.
		if n := admin.get("/paged-repo").Count(".commit-cursor-nav"); n != 0 {
			t.Errorf("commit-cursor-nav count = %d", n)
		}
	})
}