package web

import (
	"net/http"

	"github.com/go-chi/chi/v5"
	"github.com/omixlab/mosis-portal/internal/database"
)

// Handler handles web page requests
type Handler struct {
	db        *database.DB
	templates *Templates
}

// NewHandler creates a new web handler
func NewHandler(db *database.DB) (*Handler, error) {
	templates, err := NewTemplates()
	if err != nil {
		return nil, err
	}
	return &Handler{
		db:        db,
		templates: templates,
	}, nil
}

// PageData is the base data structure for all pages
type PageData struct {
	Title     string
	ActiveNav string
	Developer *database.Developer
	Error     string
}

// Login renders the login page
func (h *Handler) Login(w http.ResponseWriter, r *http.Request) {
	data := PageData{
		Title: "Sign In",
	}

	// Check for error message
	if err := r.URL.Query().Get("error"); err != "" {
		data.Error = err
	}

	h.render(w, "login", data)
}

// Dashboard renders the dashboard page
func (h *Handler) Dashboard(w http.ResponseWriter, r *http.Request) {
	developer := getDeveloperFromContext(r)
	if developer == nil {
		http.Redirect(w, r, "/login", http.StatusSeeOther)
		return
	}

	// Get stats
	apps, total, _ := h.db.ListApps(r.Context(), developer.ID, "", 1, 100)

	data := struct {
		PageData
		Stats struct {
			TotalApps   int
			Downloads   int64
			ActiveUsers int64
		}
		Apps []*database.App
	}{
		PageData: PageData{
			Title:     "Dashboard",
			ActiveNav: "dashboard",
			Developer: developer,
		},
		Apps: apps,
	}
	data.Stats.TotalApps = total
	data.Stats.Downloads = 0     // TODO: implement
	data.Stats.ActiveUsers = 0   // TODO: implement

	h.render(w, "dashboard", data)
}

// AppNew renders the new app form
func (h *Handler) AppNew(w http.ResponseWriter, r *http.Request) {
	developer := getDeveloperFromContext(r)
	if developer == nil {
		http.Redirect(w, r, "/login", http.StatusSeeOther)
		return
	}

	data := PageData{
		Title:     "Create New App",
		ActiveNav: "apps",
		Developer: developer,
	}

	h.render(w, "app_new", data)
}

// AppDetail renders the app detail page
func (h *Handler) AppDetail(w http.ResponseWriter, r *http.Request) {
	developer := getDeveloperFromContext(r)
	if developer == nil {
		http.Redirect(w, r, "/login", http.StatusSeeOther)
		return
	}

	appID := chi.URLParam(r, "appID")
	app, err := h.db.GetApp(r.Context(), appID)
	if err != nil {
		http.Error(w, "App not found", http.StatusNotFound)
		return
	}

	// Verify ownership
	if app.DeveloperID != developer.ID {
		http.Error(w, "Forbidden", http.StatusForbidden)
		return
	}

	// Get latest version
	versions, totalVersions, _ := h.db.ListVersions(r.Context(), appID, "", 1, 1)
	var latestVersion *database.AppVersion
	if len(versions) > 0 {
		latestVersion = versions[0]
	}

	data := struct {
		PageData
		App           *database.App
		Tab           string
		LatestVersion *database.AppVersion
		TotalVersions int
	}{
		PageData: PageData{
			Title:     app.Name,
			ActiveNav: "apps",
			Developer: developer,
		},
		App:           app,
		Tab:           "overview",
		LatestVersion: latestVersion,
		TotalVersions: totalVersions,
	}

	h.render(w, "app_detail", data)
}

// AppListPartial renders the app list partial for htmx
func (h *Handler) AppListPartial(w http.ResponseWriter, r *http.Request) {
	developer := getDeveloperFromContext(r)
	if developer == nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	apps, _, err := h.db.ListApps(r.Context(), developer.ID, "", 1, 100)
	if err != nil {
		http.Error(w, "Failed to load apps", http.StatusInternalServerError)
		return
	}

	data := struct {
		Apps []*database.App
	}{
		Apps: apps,
	}

	h.renderPartial(w, "app_list", data)
}

// render renders a full page template
func (h *Handler) render(w http.ResponseWriter, name string, data interface{}) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := h.templates.RenderPage(w, name, data); err != nil {
		http.Error(w, "Template error: "+err.Error(), http.StatusInternalServerError)
	}
}

// renderPartial renders a partial template
func (h *Handler) renderPartial(w http.ResponseWriter, name string, data interface{}) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := h.templates.RenderPartial(w, name, data); err != nil {
		http.Error(w, "Template error: "+err.Error(), http.StatusInternalServerError)
	}
}

// getDeveloperFromContext retrieves the developer from the request context
// This will be set by the session middleware
func getDeveloperFromContext(r *http.Request) *database.Developer {
	developer, _ := r.Context().Value("developer").(*database.Developer)
	return developer
}