package database

import (
	"database/sql"
	"fmt"
	"github.com/gosimple/slug"
	"regexp"
	"strings"
	"time"
)

type Post struct {
	ID               int
	Title            string `db:"post_title"`
	Content          string
	Date             string
	GemtextContent   sql.NullString `db:"gemtext_content"`
	TitleSlug        string         `db:"title_slug"`
	Year, Month, Day int
}

func (p *Post) GemtextPage() string {
	return fmt.Sprintf("# %s\n\n", p.Title) + p.GemtextContent.String + "\n\n" + p.Date

}

func (p *Post) HTMLPage() string {
	var content string
	if p.GemtextContent.Valid {
		content = p.GemtextContent.String
	}

	lines := strings.Split(content, "\n")
	var htmlLines []string
	htmlLines = append(htmlLines, "<h1>"+p.Title+"</h1>")

	for _, line := range lines {
		if strings.HasPrefix(line, "#") {
			htmlLines = append(htmlLines, "<h1>"+line[1:]+"</h1>")
		} else if strings.HasPrefix(line, "##") {
			htmlLines = append(htmlLines, "<h2>"+line[2:]+"</h2>")
		} else if strings.HasPrefix(line, "###") {
			htmlLines = append(htmlLines, "<h3>"+line[3:]+"</h3>")
		} else if strings.HasPrefix(line, "* ") {
			htmlLines = append(htmlLines, "<ul><li>"+line[2:]+"</li></ul>")
		} else if strings.HasPrefix(line, ">") {
			htmlLines = append(htmlLines, "<blockquote>"+line[1:]+"</blockquote>")
		} else if strings.HasPrefix(line, "=>") {
			parts := strings.Fields(line[2:])
			if len(parts) > 1 {
				url := parts[0]
				text := strings.Join(parts[1:], " ")
				htmlLines = append(htmlLines, fmt.Sprintf(`	&#8227; <a href="%s.html">%s</a>`, url, text))
			} else if len(parts) == 1 {
				url := parts[0]
				htmlLines = append(htmlLines, fmt.Sprintf(` 	&#8227; <a href="%s.html">%s</a>`, url, url))
			}

		} else {
			htmlLines = append(htmlLines, "<p>"+line+"</p>")
		}
	}
	// add link to editor for the post with id p.ID to the end of the page
	htmlLines = append(htmlLines, "<a class=\"hidden_link\" href=\"/editor/e/"+fmt.Sprintf("%d", p.ID)+"\">&bull;</a>")

	htmlDocument := strings.Join(htmlLines, "\n")

	// replace all instances of ***sometext*** with <strong>sometext</strong> where sometext is any text using regex in one line
	htmlDocument = regexp.MustCompile(`\*\*\*(.*?)\*\*\*`).ReplaceAllString(htmlDocument, "<strong> $1 </strong>")

	return htmlDocument
}

func GetPost(id int) (*Post, error) {
	db := GetDB()
	post := &Post{}
	err := db.Get(post, "SELECT id, post_title, date, gemtext_content, title_slug, year, month, day FROM posts WHERE id = ?", id)
	if err != nil {
		return nil, err
	}
	return post, nil
}

func UpdatePost(p *Post) error {
	db := GetDB()
	// sligify title and put it in p.TitleSlug

	p.TitleSlug = slug.Make(p.Title)
	_, err := db.Exec("UPDATE posts SET post_title = ?, gemtext_content = ?, title_slug = ?, year = ?, month = ?, day = ? WHERE id = ?", p.Title, p.GemtextContent, p.TitleSlug, p.Year, p.Month, p.Day, p.ID)
	if err != nil {
		return err
	}
	return nil
}

func CreateNewPost() (*Post, error) {
	db := GetDB()
	day := time.Now().Day()
	month := time.Now().Month()
	year := time.Now().Year()

	post, err := GetLastPostWithEmptyContent()
	if err != nil {
		result, err := db.Exec("INSERT INTO posts (post_title, date, gemtext_content, title_slug, year, month, day) VALUES (?, ?, ?, ?, ?, ?, ?)", "Novi Clanak", time.Now().String(), "", "new-post", year, month, day)
		if err != nil {
			return nil, err
		}

		postID, err := result.LastInsertId()
		// log postID

		if err != nil {
			return nil, err
		}
		post, err = GetPostByRowid(int(postID))
		if err != nil {
			return nil, err
		}
	}

	return post, nil
}

func GetPostByRowid(i int) (*Post, error) {
	db := GetDB()
	post := &Post{}
	err := db.Get(post, "SELECT ID, post_title, ifnull(date, 'nodate') as date, gemtext_content, title_slug, year, month, day FROM posts WHERE rowid = ?", i)
	if err != nil {
		return post, err
	}
	print(post)
	return post, nil
}

func GetLastPostWithEmptyContent() (*Post, error) {
	db := GetDB()
	post := &Post{}
	err := db.Get(post, "SELECT ID, post_title, date, gemtext_content, title_slug, year, month, day FROM posts WHERE gemtext_content = '' ORDER BY date DESC LIMIT 1")
	if err != nil {
		return nil, err
	}
	return post, nil
}