// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0

package templates

import (
	"errors"
	"os"
	"path/filepath"
	"testing"
)

// addTemplate fails the test when a template cannot be created, which is
// not what is under test in the cases that use it.
func addTemplate(t *testing.T, s *Store, tpl PostTemplate) *PostTemplate {
	t.Helper()
	created, err := s.Add(tpl)
	if err != nil {
		t.Fatalf("Add(%q): %v", tpl.Name, err)
	}
	return created
}

func TestAddAndList(t *testing.T) {
	path := filepath.Join(t.TempDir(), "templates.toml")
	s := New(path)
	tpl, err := s.Add(PostTemplate{
		Name:  "Review",
		Tags:  []string{"review"},
		Body:  "## Summary\n",
		Title: "Review: ",
		Slug:  "review",
	})
	if err != nil {
		t.Fatalf("Add: %v", err)
	}
	if tpl.Name != "Review" {
		t.Fatalf("tpl = %+v", tpl)
	}
	all := s.All()
	if len(all) != 1 || all[0].Name != "Review" || len(all[0].Tags) != 1 {
		t.Fatalf("templates = %v", all)
	}
	if all[0].Body != "## Summary\n" || all[0].Title != "Review: " || all[0].Slug != "review" {
		t.Fatalf("template fields = %+v", all[0])
	}
	if _, err := s.Add(PostTemplate{Name: "Review"}); !errors.Is(err, ErrNameTaken) {
		t.Fatalf("duplicate accepted: %v", err)
	}
	if _, err := s.Add(PostTemplate{}); !errors.Is(err, ErrEmptyName) {
		t.Fatalf("empty name accepted: %v", err)
	}

	info, err := os.Stat(path)
	if err != nil {
		t.Fatalf("stat: %v", err)
	}
	if info.Mode().Perm() != 0o600 {
		t.Fatalf("mode = %v", info.Mode().Perm())
	}

	reopened := New(path)
	if len(reopened.All()) != 1 {
		t.Fatalf("reopened = %v", reopened.All())
	}
}

// The extra fields survive the round trip through the file, which is
// what lets a scientific template pre-fill a DOI, a series or an ORCID.
func TestFieldsRoundTrip(t *testing.T) {
	path := filepath.Join(t.TempDir(), "templates.toml")
	s := New(path)
	addTemplate(t, s, PostTemplate{
		Name: "Paper",
		Fields: map[string]string{
			"doi":          "10.5555/",
			"orcid":        "0000-0002-1825-0097",
			"series":       "tds",
			"series_order": "2",
		},
	})
	reopened := New(path)
	all := reopened.All()
	if len(all) != 1 {
		t.Fatalf("templates = %v", all)
	}
	fields := all[0].Fields
	if fields["doi"] != "10.5555/" || fields["orcid"] != "0000-0002-1825-0097" ||
		fields["series"] != "tds" || fields["series_order"] != "2" {
		t.Fatalf("fields = %v", fields)
	}
	// A template without extra fields reads back with none.
	addTemplate(t, s, PostTemplate{Name: "Bare"})
	for _, tpl := range New(path).All() {
		if tpl.Name == "Bare" && tpl.Fields != nil {
			t.Fatalf("bare template has fields: %v", tpl.Fields)
		}
	}
}

func TestDelete(t *testing.T) {
	s := New(filepath.Join(t.TempDir(), "templates.toml"))
	addTemplate(t, s, PostTemplate{Name: "A"})
	if err := s.Delete("A"); err != nil {
		t.Fatalf("Delete: %v", err)
	}
	if err := s.Delete("A"); !errors.Is(err, ErrNoSuchTemplate) {
		t.Fatalf("second Delete = %v, want ErrNoSuchTemplate", err)
	}
}

func TestMissingAndBrokenFiles(t *testing.T) {
	if got := New(filepath.Join(t.TempDir(), "nope.toml")).All(); got != nil {
		t.Fatalf("templates = %v, want none", got)
	}
	path := filepath.Join(t.TempDir(), "templates.toml")
	if err := os.WriteFile(path, []byte("broken = = ="), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	if got := New(path).All(); got != nil {
		t.Fatalf("templates = %v, want none", got)
	}
}

func TestEntriesWithoutNameSkipped(t *testing.T) {
	path := filepath.Join(t.TempDir(), "templates.toml")
	body := "[[templates]]\nbody = \"no name\"\n\n[[templates]]\nname = \"ok\"\n"
	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	all := New(path).All()
	if len(all) != 1 || all[0].Name != "ok" {
		t.Fatalf("templates = %v", all)
	}
}

// A hand-written fields table with a scalar of any TOML type arrives as
// its text, so a series order written bare as a number still fills the
// form.
func TestFieldsHandWrittenTable(t *testing.T) {
	path := filepath.Join(t.TempDir(), "templates.toml")
	body := "[[templates]]\nname = \"paper\"\n[templates.fields]\nseries_order = 3\ndoi = \"10.1/x\"\n"
	if err := os.WriteFile(path, []byte(body), 0o600); err != nil {
		t.Fatalf("write: %v", err)
	}
	all := New(path).All()
	if len(all) != 1 || all[0].Fields["series_order"] != "3" || all[0].Fields["doi"] != "10.1/x" {
		t.Fatalf("templates = %+v", all)
	}
}