package blocks

import (
	"context"
	"net/http"
	"time"

	"github.com/google/uuid"
)

// --- Typed context structs ---

// PageContext provides page information to blocks via context.
// The CMS populates this from its internal db.Page type.
type PageContext struct {
	ID       uuid.UUID
	Slug     string
	Title    string
	PostType string // "page", "post", "master", "system"
	Status   string // "published", "draft", "scheduled"
}

// PostContext provides blog post information to blocks via context.
type PostContext struct {
	ID               uuid.UUID
	Slug             string
	Title            string
	Excerpt          string
	FeaturedImageURL string
	AuthorID         uuid.UUID
	PublishedAt      time.Time
	ReadingTime      int
	IsFeatured       bool
}

// AuthorContext provides author information to blocks via context.
type AuthorContext struct {
	ID        uuid.UUID
	Name      string
	Slug      string
	Bio       string
	AvatarURL string
}

// CategoryContext provides category information to blocks via context.
type CategoryContext struct {
	ID   uuid.UUID
	Name string
	Slug string
}

// MasterPageContext provides master page information during rendering.
type MasterPageContext struct {
	ID    uuid.UUID
	Slug  string
	Title string
}

// EmbedResolver resolves embedded component blocks within blog content.
type EmbedResolver interface {
	RenderEmbed(ctx context.Context, blockID uuid.UUID, dataSource, layout string) string
}

// --- Template key ---

type templateKeyContextKey struct{}

func WithTemplateKey(ctx context.Context, templateKey string) context.Context {
	return context.WithValue(ctx, templateKeyContextKey{}, templateKey)
}

func GetTemplateKey(ctx context.Context) string {
	if v, ok := ctx.Value(templateKeyContextKey{}).(string); ok {
		return v
	}
	return ""
}

// --- Queries (generic) ---

type queriesContextKey struct{}

// WithQueries stores a queries value in context. Use with GetQueries[T].
func WithQueries[T any](ctx context.Context, queries T) context.Context {
	return context.WithValue(ctx, queriesContextKey{}, queries)
}

// GetQueries retrieves a typed queries value from context.
// Usage: queries, ok := blocks.GetQueries[*db.Queries](ctx)
func GetQueries[T any](ctx context.Context) (T, bool) {
	val, ok := ctx.Value(queriesContextKey{}).(T)
	return val, ok
}

// --- Current page ---

type currentPageContextKey struct{}

func WithCurrentPage(ctx context.Context, page *PageContext) context.Context {
	return context.WithValue(ctx, currentPageContextKey{}, page)
}

func GetCurrentPage(ctx context.Context) *PageContext {
	if v, ok := ctx.Value(currentPageContextKey{}).(*PageContext); ok {
		return v
	}
	return nil
}

// --- Current blog post ---

type currentBlogPostContextKey struct{}

func WithCurrentBlogPost(ctx context.Context, post *PostContext) context.Context {
	return context.WithValue(ctx, currentBlogPostContextKey{}, post)
}

func GetCurrentBlogPost(ctx context.Context) *PostContext {
	if v, ok := ctx.Value(currentBlogPostContextKey{}).(*PostContext); ok {
		return v
	}
	return nil
}

// --- Current author ---

type currentAuthorContextKey struct{}

func WithCurrentAuthor(ctx context.Context, author *AuthorContext) context.Context {
	return context.WithValue(ctx, currentAuthorContextKey{}, author)
}

func GetCurrentAuthor(ctx context.Context) *AuthorContext {
	if v, ok := ctx.Value(currentAuthorContextKey{}).(*AuthorContext); ok {
		return v
	}
	return nil
}

// --- Current category ---

type currentCategoryContextKey struct{}

func WithCurrentCategory(ctx context.Context, category *CategoryContext) context.Context {
	return context.WithValue(ctx, currentCategoryContextKey{}, category)
}

func GetCurrentCategory(ctx context.Context) *CategoryContext {
	if v, ok := ctx.Value(currentCategoryContextKey{}).(*CategoryContext); ok {
		return v
	}
	return nil
}

// --- Requested path (for 404 pages) ---

type requestedPathContextKey struct{}

func WithRequestedPath(ctx context.Context, path string) context.Context {
	return context.WithValue(ctx, requestedPathContextKey{}, path)
}

func GetRequestedPath(ctx context.Context) string {
	if v, ok := ctx.Value(requestedPathContextKey{}).(string); ok {
		return v
	}
	return ""
}

// --- Injected slots (master page rendering) ---

type injectedSlotsContextKey struct{}

func WithInjectedSlots(ctx context.Context, slots map[string]string) context.Context {
	return context.WithValue(ctx, injectedSlotsContextKey{}, slots)
}

func GetInjectedSlotContent(ctx context.Context, slotName string) string {
	if slots, ok := ctx.Value(injectedSlotsContextKey{}).(map[string]string); ok {
		return slots[slotName]
	}
	return ""
}

func GetInjectedSlots(ctx context.Context) map[string]string {
	if slots, ok := ctx.Value(injectedSlotsContextKey{}).(map[string]string); ok {
		return slots
	}
	return nil
}

// --- Master page ---

type masterPageContextKey struct{}

func WithMasterPage(ctx context.Context, masterPage *MasterPageContext) context.Context {
	return context.WithValue(ctx, masterPageContextKey{}, masterPage)
}

func GetMasterPage(ctx context.Context) *MasterPageContext {
	if v, ok := ctx.Value(masterPageContextKey{}).(*MasterPageContext); ok {
		return v
	}
	return nil
}

func IsMasterPageContext(ctx context.Context) bool {
	return ctx.Value(masterPageContextKey{}) != nil
}

// --- HTTP request ---

type requestContextKey struct{}

func WithRequest(ctx context.Context, r *http.Request) context.Context {
	return context.WithValue(ctx, requestContextKey{}, r)
}

func GetRequest(ctx context.Context) *http.Request {
	if r, ok := ctx.Value(requestContextKey{}).(*http.Request); ok {
		return r
	}
	return nil
}

// --- Editor mode ---

type isEditorContextKey struct{}

func WithIsEditor(ctx context.Context, isEditor bool) context.Context {
	return context.WithValue(ctx, isEditorContextKey{}, isEditor)
}

func IsEditor(ctx context.Context) bool {
	if v, ok := ctx.Value(isEditorContextKey{}).(bool); ok {
		return v
	}
	return false
}

// --- Expected slots ---

type expectedSlotsContextKey struct{}

func WithExpectedSlots(ctx context.Context, slots []string) context.Context {
	return context.WithValue(ctx, expectedSlotsContextKey{}, slots)
}

func GetExpectedSlots(ctx context.Context) []string {
	if v, ok := ctx.Value(expectedSlotsContextKey{}).([]string); ok {
		return v
	}
	return nil
}

// --- Block ID ---

type blockIDContextKey struct{}

func WithBlockID(ctx context.Context, id uuid.UUID) context.Context {
	return context.WithValue(ctx, blockIDContextKey{}, id)
}

func GetBlockID(ctx context.Context) uuid.UUID {
	if v, ok := ctx.Value(blockIDContextKey{}).(uuid.UUID); ok {
		return v
	}
	return uuid.Nil
}

// --- Current page ID ---

type currentPageIDContextKey struct{}

func WithCurrentPageID(ctx context.Context, id uuid.UUID) context.Context {
	return context.WithValue(ctx, currentPageIDContextKey{}, id)
}

func GetCurrentPageID(ctx context.Context) uuid.UUID {
	if v, ok := ctx.Value(currentPageIDContextKey{}).(uuid.UUID); ok {
		return v
	}
	return uuid.Nil
}

// --- Slot renderer ---

type slotRendererContextKey struct{}

func WithSlotRenderer(ctx context.Context, r SlotRenderer) context.Context {
	return context.WithValue(ctx, slotRendererContextKey{}, r)
}

func GetSlotRenderer(ctx context.Context) SlotRenderer {
	if r, ok := ctx.Value(slotRendererContextKey{}).(SlotRenderer); ok {
		return r
	}
	return nil
}

// --- Human proof banner ---

type humanProofBannerContextKey struct{}

func WithHumanProofBanner(ctx context.Context, data *HumanProofBannerData) context.Context {
	return context.WithValue(ctx, humanProofBannerContextKey{}, data)
}

func GetHumanProofBanner(ctx context.Context) *HumanProofBannerData {
	if v, ok := ctx.Value(humanProofBannerContextKey{}).(*HumanProofBannerData); ok {
		return v
	}
	return nil
}

// --- Embed resolver ---

type embedResolverContextKey struct{}

func WithEmbedResolver(ctx context.Context, resolver EmbedResolver) context.Context {
	return context.WithValue(ctx, embedResolverContextKey{}, resolver)
}

func GetEmbedResolver(ctx context.Context) EmbedResolver {
	if r, ok := ctx.Value(embedResolverContextKey{}).(EmbedResolver); ok {
		return r
	}
	return nil
}

// --- RenderSlot ---

// RenderSlot renders children for the current container block.
func RenderSlot(ctx context.Context) string {
	blockID := GetBlockID(ctx)
	if blockID == uuid.Nil {
		return ""
	}
	renderer := GetSlotRenderer(ctx)
	if renderer == nil {
		return ""
	}
	return renderer.RenderContainerSlot(ctx, blockID)
}

// --- BlockContext (pongo2 template data) ---

// BlockContext provides contextual information available to all block templates.
type BlockContext struct {
	URL         string            `pongo2:"url"`
	Path        string            `pongo2:"path"`
	Slug        string            `pongo2:"slug"`
	PageID      string            `pongo2:"pageId"`
	PageTitle   string            `pongo2:"pageTitle"`
	TemplateKey string            `pongo2:"templateKey"`
	IsEditor    bool              `pongo2:"isEditor"`
	Timestamp   int64             `pongo2:"timestamp"`
	IsLoggedIn  bool              `pongo2:"isLoggedIn"`
	UserID      string            `pongo2:"userId"`
	UserEmail   string            `pongo2:"userEmail"`
	UserRole    string            `pongo2:"userRole"`
	Method      string            `pongo2:"method"`
	Host        string            `pongo2:"host"`
	Query       map[string]string `pongo2:"query"`
	Referrer    string            `pongo2:"referrer"`
	UserAgent   string            `pongo2:"userAgent"`
	IP          string            `pongo2:"ip"`
	Cookies     map[string]string `pongo2:"cookies"`
	Headers     map[string]string `pongo2:"headers"`
	Country     string            `pongo2:"country"`
	City        string            `pongo2:"city"`
	Timezone    string            `pongo2:"timezone"`
	Now         time.Time         `pongo2:"now"`
	CurrentAuthor   map[string]any `pongo2:"currentAuthor"`
	CurrentPost     map[string]any `pongo2:"currentPost"`
	CurrentCategory map[string]any `pongo2:"currentCategory"`
	Site            map[string]any `pongo2:"site"`
	IsPublicLoggedIn    bool   `pongo2:"isPublicLoggedIn"`
	PublicUserID        string `pongo2:"publicUserId"`
	PublicUsername      string `pongo2:"publicUsername"`
	PublicDisplayName   string `pongo2:"publicDisplayName"`
	PublicEmailVerified bool   `pongo2:"publicEmailVerified"`
	DetailRowID   string         `pongo2:"detailRowId"`
	DetailTableID string         `pongo2:"detailTableId"`
	DetailRowData map[string]any `pongo2:"detailRowData"`
	BlogIndexURL    string `pongo2:"blogIndexUrl"`
	CategoryPageURL string `pongo2:"categoryPageUrl"`
}

type blockContextKey struct{}

func WithBlockContext(ctx context.Context, blockCtx *BlockContext) context.Context {
	return context.WithValue(ctx, blockContextKey{}, blockCtx)
}

func GetBlockContext(ctx context.Context) *BlockContext {
	if bc, ok := ctx.Value(blockContextKey{}).(*BlockContext); ok {
		return bc
	}
	return nil
}

// ToMap converts the BlockContext to a map for pongo2 template injection.
func (bc *BlockContext) ToMap() map[string]any {
	return map[string]any{
		"url": bc.URL, "path": bc.Path, "slug": bc.Slug,
		"pageId": bc.PageID, "pageTitle": bc.PageTitle,
		"templateKey": bc.TemplateKey, "isEditor": bc.IsEditor,
		"timestamp": bc.Timestamp, "now": bc.Now,
		"isLoggedIn": bc.IsLoggedIn, "userId": bc.UserID,
		"userEmail": bc.UserEmail, "userRole": bc.UserRole,
		"method": bc.Method, "host": bc.Host, "query": bc.Query,
		"referrer": bc.Referrer, "userAgent": bc.UserAgent,
		"ip": bc.IP, "cookies": bc.Cookies, "headers": bc.Headers,
		"country": bc.Country, "city": bc.City, "timezone": bc.Timezone,
		"currentAuthor": bc.CurrentAuthor, "currentPost": bc.CurrentPost,
		"currentCategory": bc.CurrentCategory, "site": bc.Site,
		"isPublicLoggedIn": bc.IsPublicLoggedIn,
		"publicUserId": bc.PublicUserID, "publicUsername": bc.PublicUsername,
		"publicDisplayName": bc.PublicDisplayName,
		"publicEmailVerified": bc.PublicEmailVerified,
		"detailRowId": bc.DetailRowID, "detailTableId": bc.DetailTableID,
		"detailRowData": bc.DetailRowData,
		"blogIndexUrl": bc.BlogIndexURL, "categoryPageUrl": bc.CategoryPageURL,
	}
}

// --- Detail row ---

// DetailRowInfo holds the resolved data table row for detail pages.
type DetailRowInfo struct {
	TableID string
	RowID   string
	Data    map[string]any
}

type detailRowKey struct{}

func WithDetailRow(ctx context.Context, tableID, rowID string, data map[string]any) context.Context {
	return context.WithValue(ctx, detailRowKey{}, &DetailRowInfo{TableID: tableID, RowID: rowID, Data: data})
}

func GetDetailRow(ctx context.Context) *DetailRowInfo {
	if v, ok := ctx.Value(detailRowKey{}).(*DetailRowInfo); ok {
		return v
	}
	return nil
}