package handlers

import (
	"fmt"
	"net/http"
	"strconv"
	"time"

	"go-crm/internal/db"
	"go-crm/internal/templates"

	"github.com/go-chi/chi/v5"
)

func (a *App) ListServices(w http.ResponseWriter, r *http.Request) {
	accountID, ok := a.requireAuth(w, r)
	if !ok {
		return
	}

	limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))
	offset, _ := strconv.Atoi(r.URL.Query().Get("offset"))
	clientID, _ := strconv.ParseInt(r.URL.Query().Get("client_id"), 10, 64)
	if limit == 0 {
		limit = 20
	}

	services, err := db.ListServices(a.DB, accountID, clientID, limit, offset)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	clients, err := db.ListClients(a.DB, accountID, limit, offset)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	var clientOptions string
	for _, c := range clients {
		clientOptions += fmt.Sprintf(`<option value="%d">%s</option>`, c.ClientID, htmlEscape(c.Name))
	}

	buf := templates.BufRender()
	actions := `<button type="button" onclick="document.getElementById('serviceForm').classList.toggle('hidden')" class="btn-primary"><svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4"/></svg> Add Service</button>`
	fmt.Fprint(buf, templates.PageHeader("Services", "Your service catalog and pricing", actions))

	fmt.Fprintf(buf, `
<div id="serviceForm" class="hidden mb-6 animate-slide-up">
    <div class="card-industrial p-5">
        <h3 class="text-sm font-semibold text-zinc-200 mb-4">New Service</h3>
        <form hx-post="/services" hx-target="#serviceList" hx-swap="innerHTML" class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
            <input type="text" name="name" placeholder="Service Name" required class="input-industrial">
            <input type="number" name="price" placeholder="Price" step="0.01" class="input-industrial">
            <input type="text" name="duration" placeholder="Duration" class="input-industrial">
            <select name="client_id" required class="input-industrial"><option value="">Select Client</option>%s</select>
            <textarea name="description" placeholder="Description" class="input-industrial sm:col-span-2 lg:col-span-3" rows="2"></textarea>
            <div class="flex items-end"><button type="submit" class="btn-primary">Save</button></div>
        </form>
    </div>
</div>`, clientOptions)

	if len(services) == 0 {
		fmt.Fprint(buf, templates.EmptyState(`<path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37 1.608.536 3.135-.493 3.35-2.572zM15 12a3 3 0 11-6 0 3 3 0 016 0z"/>`, "No services yet. Add your first service to the catalog."))
	} else {
		fmt.Fprintf(buf, `<div class="card-industrial overflow-hidden animate-slide-up stagger-1"><div class="overflow-x-auto">`)
		fmt.Fprint(buf, templates.TableStart([]string{"Name", "Price", "Duration", "Actions"}))
		for _, s := range services {
			fmt.Fprintf(buf, `<tr>
                <td class="font-medium text-zinc-200">%s</td>
                <td class="font-mono text-sm text-emerald-400">R$ %.2f</td>
                <td class="text-xs text-zinc-400">%s</td>
                <td>
                    <div class="flex items-center gap-2">
                        <a href="/services/%d" class="btn-ghost btn-sm">View</a>
                        <button type="button" onclick="document.getElementById('editServ%d').classList.toggle('hidden')" class="btn-ghost btn-sm">Edit</button>
                        <form hx-delete="/services/%d" hx-target="closest tr" hx-swap="outerHTML" style="display:inline">
                            <button type="submit" class="btn-danger btn-sm" onclick="return confirm('Delete?')">Delete</button>
                        </form>
                    </div>
                </td>
            </tr>`, htmlEscape(s.Name), s.Price, htmlEscape(s.Duration), s.ServiceID, s.ServiceID, s.ServiceID)
		}
		fmt.Fprint(buf, templates.TableEnd())
		fmt.Fprintf(buf, `</div></div>`)

		for _, s := range services {
			fmt.Fprintf(buf, `
<div id="editServ%d" class="hidden mt-4 animate-slide-up">
    <div class="card-industrial p-5 border-amber-400/10">
        <h3 class="text-sm font-semibold text-zinc-200 mb-3">Edit %s</h3>
        <form hx-put="/services/%d" hx-target="#serviceList" hx-swap="innerHTML" class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-3">
            <input type="text" name="name" value="%s" class="input-industrial text-xs">
            <input type="number" name="price" value="%.2f" step="0.01" class="input-industrial text-xs">
            <input type="text" name="duration" value="%s" class="input-industrial text-xs">
            <select name="client_id" class="input-industrial text-xs"><option value="%d">%s</option>%s</select>
            <textarea name="description" class="input-industrial text-xs sm:col-span-2 lg:col-span-3" rows="2">%s</textarea>
            <div class="flex items-end gap-2">
                <button type="submit" class="btn-primary btn-sm">Save</button>
                <button type="button" onclick="document.getElementById('editServ%d').classList.add('hidden')" class="btn-ghost btn-sm">Cancel</button>
            </div>
        </form>
    </div>
</div>`, s.ServiceID, htmlEscape(s.Name), s.ServiceID, htmlEscape(s.Name), s.Price, htmlEscape(s.Duration), s.ClientID, htmlEscape(s.Name), clientOptions, htmlEscape(s.Description), s.ServiceID)
		}
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	templates.WritePage(w, buf, "Services", "services")
}

func (a *App) CreateService(w http.ResponseWriter, r *http.Request) {
	accountID, ok := a.requireAuth(w, r)
	if !ok {
		return
	}

	r.ParseForm()
	clientID, _ := strconv.ParseInt(r.FormValue("client_id"), 10, 64)

	var checkID int64
	err := a.DB.QueryRow("SELECT client_id FROM clients WHERE client_id = ? AND account_id = ?", clientID, accountID).Scan(&checkID)
	if err != nil {
		http.Error(w, "Invalid client", http.StatusBadRequest)
		return
	}

	price, _ := strconv.ParseFloat(r.FormValue("price"), 64)
	service := db.Service{
		ClientID:    clientID,
		Name:        r.FormValue("name"),
		Price:       price,
		Description: r.FormValue("description"),
		Duration:    r.FormValue("duration"),
		CreatedAt:   time.Now().Unix(),
	}

	if err := service.Create(a.DB); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("HX-Refresh", "true")
}

func (a *App) ViewService(w http.ResponseWriter, r *http.Request) {
	_, ok := a.requireAuth(w, r)
	if !ok {
		return
	}

	id, _ := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	var s db.Service
	err := a.DB.QueryRow("SELECT service_id, client_id, name, price, description, duration, created_at FROM services WHERE service_id = ?", id).Scan(&s.ServiceID, &s.ClientID, &s.Name, &s.Price, &s.Description, &s.Duration, &s.CreatedAt)
	if err != nil {
		http.Error(w, "Service not found", http.StatusNotFound)
		return
	}

	buf := templates.BufRender()
	fmt.Fprint(buf, templates.PageHeader(htmlEscape(s.Name), "Service details"))
	fmt.Fprintf(buf, `
<div class="max-w-lg animate-slide-up">
    <div class="card-industrial p-6">
        <div class="space-y-4">
            <div class="flex justify-between py-3 border-b border-white/[0.04]">
                <span class="text-xs font-mono uppercase text-zinc-500">Price</span>
                <span class="text-lg font-mono font-semibold text-emerald-400">R$ %.2f</span>
            </div>
            <div class="flex justify-between py-3 border-b border-white/[0.04]">
                <span class="text-xs font-mono uppercase text-zinc-500">Duration</span>
                <span class="text-sm text-zinc-300">%s</span>
            </div>
            <div class="flex justify-between py-3">
                <span class="text-xs font-mono uppercase text-zinc-500">Description</span>
                <span class="text-sm text-zinc-300 text-right max-w-xs">%s</span>
            </div>
        </div>
        <div class="mt-6">
            <a href="/services" class="btn-ghost btn-sm">Back</a>
        </div>
    </div>
</div>`, s.Price, htmlEscape(s.Duration), htmlEscape(s.Description))

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	templates.WritePage(w, buf, s.Name, "services")
}

func (a *App) UpdateService(w http.ResponseWriter, r *http.Request) {
	_, ok := a.requireAuth(w, r)
	if !ok {
		return
	}

	id, _ := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	r.ParseForm()
	clientID, _ := strconv.ParseInt(r.FormValue("client_id"), 10, 64)
	price, _ := strconv.ParseFloat(r.FormValue("price"), 64)
	_, err := a.DB.Exec("UPDATE services SET client_id=?, name=?, price=?, description=?, duration=? WHERE service_id=?", clientID, r.FormValue("name"), price, r.FormValue("description"), r.FormValue("duration"), id)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	w.Header().Set("HX-Refresh", "true")
}

func (a *App) DeleteService(w http.ResponseWriter, r *http.Request) {
	_, ok := a.requireAuth(w, r)
	if !ok {
		return
	}

	id, _ := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	a.DB.Exec("DELETE FROM services WHERE service_id = ?", id)
}

// --- package-level shims ---

func ListServices(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).ListServices(w, r)
}
func CreateService(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).CreateService(w, r)
}
func ViewService(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).ViewService(w, r)
}
func UpdateService(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).UpdateService(w, r)
}
func DeleteService(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).DeleteService(w, r)
}