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package blog

import (
	"errors"
	"fmt"
	"html/template"
	"io/fs"
	"net/url"
	"os"
	"time"

	"github.com/bmatcuk/doublestar/v4"
)

// Blog is a collection of [Article]
type Blog struct {
	indexTemplate   *template.Template
	articleTemplate *template.Template
	Articles        []Article
}

// Article is a blog post/article
type Article struct {
	Path     string
	Title    string
	Subtitle string
	Summary  string
	Content  string
	Time     time.Time
	Authors  []Author
	Tags     []string
}

// Author is an author of a blog post
type Author struct {
	Name  string
	Job   string
	Email string
	Links []Link
}

// Link is a link name and URL
type Link struct {
	Name string
	URL  *url.URL
}

func NewBlog(dir string) (*Blog, error) {
	tmpl, err := parseTemplates(os.DirFS(dir))
	if err != nil {
		return nil, fmt.Errorf("could not parse templates in %q: %w", dir, err)
	}
	index := tmpl.Lookup("index")
	if index == nil {
		return nil, errors.New("`index` template is required but was not found")
	}
	article := tmpl.Lookup("article")
	if article == nil {
		return nil, errors.New("`article` template is required but was not found")
	}
	return &Blog{
		indexTemplate:   index,
		articleTemplate: article,
	}, nil
}

func parseTemplates(fs fs.FS) (*template.Template, error) {
	matches, err := doublestar.Glob(fs, "**/*.{tmpl,gohtml}")
	if err != nil {
		return nil, fmt.Errorf("could not glob templates: %w", err)
	}
	tmpl, err := template.New("").ParseFiles(matches...)
	if err != nil {
		return nil, fmt.Errorf("could not parse templates: %w", err)
	}
	return tmpl, nil
}

func parseArticles(fs fs.FS) ([]Article, error) {
	matches, err := doublestar.Glob(fs, "**/*.md")
	if err != nil {
		return nil, fmt.Errorf("could not glob articles: %w", err)
	}
	for _, match := range matches {
	}
}