package handlers

import (
	"net/http"

	c "github.com/juanatsap/cv-site/internal/constants"
	"github.com/juanatsap/cv-site/internal/httputil"
	"github.com/juanatsap/cv-site/internal/middleware"
)

// ==============================================================================
// HTMX TOGGLE HANDLERS
// These handlers manage user preferences (length, icons, language, theme)
// using atomic out-of-band swaps for a smooth UX
// ==============================================================================

// ToggleLength handles CV length toggle (short/long) using atomic out-of-band swaps
func (h *CVHandler) ToggleLength(w http.ResponseWriter, r *http.Request) {
	if !httputil.RequirePost(w, r) {
		return
	}

	// Get current preferences from context (set by middleware, already migrated)
	prefs := middleware.GetPreferences(r)
	currentLength := prefs.CVLength

	// Toggle state
	newLength := c.CVLengthLong
	if currentLength == c.CVLengthLong {
		newLength = c.CVLengthShort
	}

	// Save new state
	middleware.SetPreferenceCookie(w, c.CookieCVLength, newLength)

	// Return 204 No Content - frontend uses hx-swap="none" so response body is ignored
	// The cookie is set and hyperscript handles the UI state toggle
	w.WriteHeader(http.StatusNoContent)
}

// ToggleIcons handles icon visibility toggle using atomic out-of-band swaps
func (h *CVHandler) ToggleIcons(w http.ResponseWriter, r *http.Request) {
	if !httputil.RequirePost(w, r) {
		return
	}

	// Get current preferences from context (set by middleware, already migrated)
	prefs := middleware.GetPreferences(r)
	currentIcons := prefs.CVIcons

	// Toggle state
	newIcons := c.CVIconsHide
	if currentIcons == c.CVIconsHide {
		newIcons = c.CVIconsShow
	}

	// Save new state
	middleware.SetPreferenceCookie(w, c.CookieCVIcons, newIcons)

	// Return 204 No Content - frontend uses hx-swap="none" so response body is ignored
	// The cookie is set and hyperscript handles the UI state toggle
	w.WriteHeader(http.StatusNoContent)
}

// SwitchLanguage handles language switching with atomic updates
// Uses HTMX out-of-band swaps to update both the language selector buttons
// and all CV content wrappers in a single response
func (h *CVHandler) SwitchLanguage(w http.ResponseWriter, r *http.Request) {
	lang, ok := httputil.LangOrError(r)
	if !ok {
		HandleError(w, r, BadRequestError("Unsupported language. Use 'en' or 'es'"))
		return
	}

	// Save language preference
	middleware.SetPreferenceCookie(w, c.CookieCVLanguage, lang)

	// Prepare template data
	data, err := h.prepareTemplateData(lang)
	if err != nil {
		HandleError(w, r, DataLoadError(err, "CV"))
		return
	}

	// Get current preferences from context (set by middleware)
	prefs := middleware.GetPreferences(r)

	// Add preferences to data
	if prefs.CVLength == c.CVLengthLong {
		data["CVLengthClass"] = "cv-long"
	} else {
		data["CVLengthClass"] = "cv-short"
	}
	data["ShowIcons"] = (prefs.CVIcons == c.CVIconsShow)
	data["ThemeClean"] = (prefs.CVTheme == c.CVThemeClean)

	// Render language-switch template with out-of-band swaps
	tmpl, err := h.templates.Render("language-switch.html")
	if err != nil {
		HandleError(w, r, TemplateError(err, "language-switch.html"))
		return
	}

	w.Header().Set(c.HeaderContentType, c.ContentTypeHTML)
	if err := tmpl.Execute(w, data); err != nil {
		HandleError(w, r, TemplateError(err, "language-switch.html"))
		return
	}
}

// ToggleTheme handles theme toggle (default/clean) using atomic out-of-band swaps
func (h *CVHandler) ToggleTheme(w http.ResponseWriter, r *http.Request) {
	if !httputil.RequirePost(w, r) {
		return
	}

	// Get current preferences from context (set by middleware)
	prefs := middleware.GetPreferences(r)
	currentTheme := prefs.CVTheme

	// Toggle state
	newTheme := c.CVThemeClean
	if currentTheme == c.CVThemeClean {
		newTheme = c.CVThemeDefault
	}

	// Save new state
	middleware.SetPreferenceCookie(w, c.CookieCVTheme, newTheme)

	// Return 204 No Content - frontend uses hx-swap="none" so response body is ignored
	// The cookie is set and hyperscript handles the UI state toggle
	w.WriteHeader(http.StatusNoContent)
}