package blocks

import (
	"context"
	"fmt"
	"strings"

	"github.com/google/uuid"
)

// BlockFunc renders a block given its content data.
type BlockFunc func(ctx context.Context, content map[string]any) string

// BlockCategory represents categories for organizing blocks in the palette.
type BlockCategory string

const (
	CategoryContent    BlockCategory = "content"
	CategoryLayout     BlockCategory = "layout"
	CategoryNavigation BlockCategory = "navigation"
	CategoryBlog       BlockCategory = "blog"
	CategoryTheme      BlockCategory = "theme"
)

// BlockMeta provides metadata about a block type for admin UI and validation.
type BlockMeta struct {
	Key             string
	Title           string
	Description     string
	Category        BlockCategory
	HasInternalSlot bool
	Source          string
	Hidden          bool
	EditorJS        string
}

// BlockNode represents a block with its content and children for rendering.
type BlockNode struct {
	ID          uuid.UUID
	BlockKey    string
	Title       string
	Content     map[string]any
	HtmlContent string
	Children    []*BlockNode
	SortOrder   int
}

// SlotRenderer is the interface for rendering container slots.
type SlotRenderer interface {
	RenderContainerSlot(ctx context.Context, containerID uuid.UUID) string
}

// HumanProofBannerData holds data for the public human proof banner.
type HumanProofBannerData struct {
	ActiveTimeMinutes int
	KeystrokeCount    int
	SessionCount      int
	PostSlug          string
}

// RenderHumanProofBanner renders the public-facing banner HTML.
func RenderHumanProofBanner(hp *HumanProofBannerData) string {
	return fmt.Sprintf(`<div id="hp-banner-%[4]s" data-human-proof-banner class="rounded-lg overflow-hidden my-6">`+
		`<div class="flex items-center justify-between py-3 px-5 bg-muted border border-border rounded-lg">`+
		`<div class="flex items-center gap-3">`+
		`<div class="w-8 h-8 bg-primary text-primary-foreground rounded-md flex items-center justify-center text-xs font-bold">HP</div>`+
		`<div>`+
		`<div class="font-semibold text-sm text-foreground">Human Proof</div>`+
		`<div class="text-xs text-muted-foreground">%[1]d min active &middot; %[2]s keystrokes &middot; %[3]d sessions</div>`+
		`</div></div>`+
		`<button class="px-4 py-1.5 bg-primary text-primary-foreground rounded-md text-sm font-medium cursor-pointer hover:bg-primary/90 border-0" data-action="watch">Watch this post being written</button>`+
		`</div></div>`+
		`<script src="/assets/human-proof-player.js" defer></script>`+
		`<script>document.addEventListener("DOMContentLoaded",function(){if(window.HumanProof){window.HumanProof.init({postSlug:%[4]q,bannerId:"hp-banner-%[4]s",contentId:"hp-content-%[4]s"})}});</script>`,
		hp.ActiveTimeMinutes,
		formatThousands(hp.KeystrokeCount),
		hp.SessionCount,
		hp.PostSlug,
	)
}

func formatThousands(n int) string {
	if n < 1000 {
		return fmt.Sprintf("%d", n)
	}
	s := fmt.Sprintf("%d", n)
	var result []byte
	for i, c := range s {
		if i > 0 && (len(s)-i)%3 == 0 {
			result = append(result, ',')
		}
		result = append(result, byte(c))
	}
	return string(result)
}

// ResolveMediaPath converts a media: prefixed path to a /media/ URL path.
func ResolveMediaPath(path string) string {
	if after, ok := strings.CutPrefix(path, "media:"); ok {
		return "/media/" + after
	}
	if _, err := uuid.Parse(path); err == nil {
		return "/media/" + path
	}
	return path
}