package handlers

import (
	"net/http"
	"strconv"
	"time"

	"github.com/gin-contrib/sessions"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"

	"go_blog/models"
)

// MyArticlesPage renders the logged-in user's article management page.
func MyArticlesPage(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		tr := getTr(c)
		session := sessions.Default(c)
		userID := session.Get("user_id")

		var articles []models.Article
		db.Where("author_id = ?", userID).Order("created_at DESC").Find(&articles)

		data := DefaultData(c)
		data["Title"] = tr["my_articles_title"]
		data["Articles"] = articles
		c.HTML(http.StatusOK, "my_articles", data)
	}
}

// MyArticleCreatePage renders the article creation form for regular users.
func MyArticleCreatePage(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		tr := getTr(c)
		token := randomToken()
		session := sessions.Default(c)
		session.Set("pending_token", token)
		session.Save()

		renderMyArticleForm(c, db, articleForm{
			Action:       "/my/articles/new",
			TitleText:    tr["article_create_title"],
			SessionToken: token,
		}, "")
	}
}

// MyArticleCreate handles the POST request to create a new article for regular users.
func MyArticleCreate(db *gorm.DB) gin.HandlerFunc {
	return ArticleCreate(db) // Reuse the same logic
}

// MyArticleEditPage renders the article edit form for the logged-in user's own articles.
func MyArticleEditPage(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		tr := getTr(c)
		id := c.Param("id")
		session := sessions.Default(c)
		userID := session.Get("user_id")

		var article models.Article
		if err := db.First(&article, "id = ? AND author_id = ?", id, userID).Error; err != nil {
			c.Redirect(http.StatusFound, "/my/articles")
			return
		}

		renderMyArticleForm(c, db, articleForm{
			Title:       article.Title,
			Slug:        article.Slug,
			Summary:     article.Summary,
			Content:     article.Content,
			Cover:       article.Cover,
			StatusStr:   strconv.Itoa(article.Status),
			IsTop:       article.IsTop,
			PublishedAt: formatPublishedAt(article.PublishedAt),
			Action:      "/my/articles/" + id + "/edit",
			TitleText:   tr["article_edit_title"],
			ArticleID:   article.ID,
		}, "")
	}
}

// MyArticleUpdate handles the POST request to update the user's own article.
func MyArticleUpdate(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		tr := getTr(c)
		id := c.Param("id")
		session := sessions.Default(c)
		userID := session.Get("user_id")

		var article models.Article
		if err := db.First(&article, "id = ? AND author_id = ?", id, userID).Error; err != nil {
			c.Redirect(http.StatusFound, "/my/articles")
			return
		}

		f := parseArticleForm(c)
		f.Action = "/my/articles/" + id + "/edit"
		f.TitleText = tr["article_edit_title"]
		f.ArticleID = article.ID

		if f.Title == "" {
			renderMyArticleForm(c, db, f, tr["article_title_required"])
			return
		}
		if f.Content == "" {
			renderMyArticleForm(c, db, f, tr["article_content_required"])
			return
		}

		if f.Slug == "" {
			f.Slug = generateSlug(f.Title)
			if f.Slug == "" {
				f.Slug = fallbackSlug(article.ID)
			}
		}

		newStatus := statusFromForm(f.StatusStr)

		// Handle published_at: use form value if provided, otherwise auto-stamp on first publish.
		var publishedAt *time.Time
		if f.PublishedAt != "" {
			// User provided a custom published time
			publishedAt = parsePublishedAt(f.PublishedAt)
		} else {
			// Stamp the publish time the first time an article is published.
			wasPublished := article.Status == models.ArticlePublished
			publishedAt = article.PublishedAt
			if newStatus == models.ArticlePublished && !wasPublished && publishedAt == nil {
				now := time.Now()
				publishedAt = &now
			}
		}

		updates := map[string]interface{}{
			"title":        f.Title,
			"slug":         f.Slug,
			"summary":      f.Summary,
			"content":      f.Content,
			"cover":        f.Cover,
			"status":       newStatus,
			"is_top":       f.IsTop,
			"published_at": publishedAt,
		}

		if err := db.Model(&article).Updates(updates).Error; err != nil {
			renderMyArticleForm(c, db, f, tr["article_error"])
			return
		}

		c.Redirect(http.StatusFound, "/my/articles")
	}
}

// MyArticleDelete soft-deletes the user's own article.
func MyArticleDelete(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		id := c.Param("id")
		session := sessions.Default(c)
		userID := session.Get("user_id")

		db.Where("id = ? AND author_id = ?", id, userID).Delete(&models.Article{})
		c.Redirect(http.StatusFound, "/my/articles")
	}
}

// renderMyArticleForm renders the article form for regular users.
func renderMyArticleForm(c *gin.Context, db *gorm.DB, f articleForm, errMsg string) {
	data := DefaultData(c)
	data["Title"] = f.TitleText
	if errMsg != "" {
		data["Error"] = errMsg
	}
	applyFormToData(data, f)
	c.HTML(http.StatusOK, "my_article_form", data)
}