package handlers

import (
	"fmt"
	"strconv"

	"github.com/gofiber/fiber/v3"
	"lmika.dev/lmika/weiro/models"
	"lmika.dev/lmika/weiro/providers/db"
	"lmika.dev/lmika/weiro/services/categories"
	"lmika.dev/lmika/weiro/services/posts"
)

type PostsHandler struct {
	PostService     *posts.Service
	CategoryService *categories.Service
}

func (ph PostsHandler) Index(c fiber.Ctx) error {
	var req struct {
		Filter string `query:"filter"`
		Page   int    `query:"page"`
	}
	if err := c.Bind().Query(&req); err != nil {
		return fiber.ErrBadRequest
	}

	const perPage = 25
	if req.Page < 1 {
		req.Page = 1
	}

	result, err := ph.PostService.ListPosts(c.Context(), req.Filter == "deleted", db.PagingParams{
		Offset: int64((req.Page - 1) * perPage),
		Limit:  perPage,
	})
	if err != nil {
		return err
	}

	totalPages := int(result.TotalCount+int64(perPage)-1) / perPage
	if totalPages < 1 {
		totalPages = 1
	}

	pageInfo := models.PageInfo{
		CurrentPage:  req.Page,
		TotalPages:   totalPages,
		PostsPerPage: perPage,
	}

	return accepts(c, json(func() any {
		return result.Posts
	}), html(func(c fiber.Ctx) error {
		return c.Render("posts/index", fiber.Map{
			"req":      req,
			"posts":    result.Posts,
			"pageInfo": pageInfo,
		})
	}))
}

func (ph PostsHandler) New(c fiber.Ctx) error {
	p := models.Post{
		GUID:  models.NewNanoID(),
		State: models.StateDraft,
	}

	cats, err := ph.CategoryService.ListCategories(c.Context())
	if err != nil {
		return err
	}

	return c.Render("posts/edit", fiber.Map{
		"post":               p,
		"categories":         cats,
		"selectedCategories": map[int64]bool{},
		"bodyClass":          "large-editor",
	})
}

func (ph PostsHandler) Edit(c fiber.Ctx) error {
	postIDStr := c.Params("postID")
	if postIDStr == "" {
		return fiber.ErrBadRequest
	}
	postID, err := strconv.ParseInt(postIDStr, 10, 64)
	if err != nil {
		return fiber.ErrBadRequest
	}

	post, err := ph.PostService.GetPost(c.Context(), postID)
	if err != nil {
		return err
	}

	cats, err := ph.CategoryService.ListCategories(c.Context())
	if err != nil {
		return err
	}

	postCats, err := ph.PostService.GetPostCategories(c.Context(), postID)
	if err != nil {
		return err
	}

	selectedCategories := make(map[int64]bool)
	for _, pc := range postCats {
		selectedCategories[pc.ID] = true
	}

	return accepts(c, json(func() any {
		return post
	}), html(func(c fiber.Ctx) error {
		return c.Render("posts/edit", fiber.Map{
			"post":               post,
			"categories":         cats,
			"selectedCategories": selectedCategories,
			"bodyClass":          "large-editor",
		})
	}))
}

func (ph PostsHandler) Update(c fiber.Ctx) error {
	var req posts.CreatePostParams
	if err := c.Bind().Body(&req); err != nil {
		return err
	}

	post, err := ph.PostService.UpdatePost(c.Context(), req)
	if err != nil {
		return err
	}

	return accepts(c, json(func() any {
		// TODO: should be created if brand new
		return post
	}), html(func(c fiber.Ctx) error {
		return c.Redirect().To(fmt.Sprintf("/sites/%v/posts", post.SiteID))
	}))
}

func (ph PostsHandler) Patch(c fiber.Ctx) error {
	postIDStr := c.Params("postID")
	if postIDStr == "" {
		return fiber.ErrBadRequest
	}
	postID, err := strconv.ParseInt(postIDStr, 10, 64)
	if err != nil {
		return fiber.ErrBadRequest
	}

	var req struct {
		Action string `json:"action"`
	}
	if err := c.Bind().Body(&req); err != nil {
		return err
	}

	switch req.Action {
	case "restore":
		if err := ph.PostService.RestorePost(c.Context(), postID); err != nil {
			return err
		}
	default:
		return fiber.ErrBadRequest
	}

	return accepts(c, json(func() any {
		return struct{}{}
	}), html(func(c fiber.Ctx) error {
		return c.Redirect().To(fmt.Sprintf("/sites/%v/posts", models.MustGetSite(c.Context()).ID))
	}))
}

func (ph PostsHandler) Delete(c fiber.Ctx) error {
	postIDStr := c.Params("postID")
	if postIDStr == "" {
		return fiber.ErrBadRequest
	}

	postID, err := strconv.ParseInt(postIDStr, 10, 64)
	if err != nil {
		return fiber.ErrBadRequest
	}

	var req struct {
		Hard bool `query:"hard"`
	}
	if err := c.Bind().Query(&req); err != nil {
		return err
	}

	if err := ph.PostService.DeletePost(c.Context(), postID, req.Hard); err != nil {
		return err
	}

	return accepts(c, json(func() any {
		return fiber.Map{}
	}), html(func(c fiber.Ctx) error {
		return c.Redirect().To("/")
	}))
}