package handlers

import (
	"fmt"
	"html/template"
	"net/http"
	"strconv"

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

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

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

	clientID := a.clientIDForAccount(accountID)
	if clientID == 0 {
		http.Error(w, "No client found for account", http.StatusBadRequest)
		return
	}

	kws, err := db.ListServiceKeywords(a.DB, clientID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	statuses, _ := db.ListLeadStatuses(a.DB, clientID)
	services := a.serviceNames(clientID)

	pendingCount, _ := db.CountLeadsNeedingReview(a.DB, clientID)

	buf := templates.BufRender()
	fmt.Fprint(buf, templates.PageHeader("Keyword Mapping", "Auto-detect services from WhatsApp messages"))

	if pendingCount > 0 {
		fmt.Fprintf(buf, `<div class="mb-4"><a href="/leads/review" class="inline-flex items-center gap-2 px-3 py-2 bg-rose-400/5 border border-rose-400/15 rounded-lg text-xs text-rose-400 hover:bg-rose-400/10 transition-colors"><span class="w-1.5 h-1.5 rounded-full bg-rose-400 animate-pulse"></span>%d pending review</a></div>`, pendingCount)
	}

	// Service Keywords Section
	keywordForm := fmt.Sprintf(`
<form hx-post="/leads/keywords" hx-target="#keywordTable" hx-swap="outerHTML" class="flex flex-wrap gap-3 mb-4">
    <select name="service_name" class="input-industrial max-w-xs">%s</select>
    <input type="text" name="keyword" placeholder="Keyword (e.g. massagem)" required class="input-industrial max-w-xs">
    <button type="submit" class="btn-primary">Add Keyword</button>
</form>
%s`, buildServiceSelectOptions(services), renderKeywordTable(kws))
	fmt.Fprint(buf, templates.SectionCard("Service Keywords", "Add keywords that trigger automatic service detection. Case and accent insensitive.", template.HTML(keywordForm)))

	// Statuses Section
	statusForm := fmt.Sprintf(`
<form hx-post="/leads/statuses" hx-target="#statusTable" hx-swap="outerHTML" class="flex flex-wrap gap-3 mb-4">
    <input type="text" name="status_name" placeholder="New status name" required class="input-industrial max-w-xs">
    <button type="submit" class="btn-primary">Add Status</button>
</form>
%s`, renderStatusTable(statuses))
	fmt.Fprintf(buf, `<div class="mt-6">%s</div>`, templates.SectionCard("Lead Statuses", "Manage the status options available for leads.", template.HTML(statusForm)))

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

func (a *App) AddServiceKeyword(w http.ResponseWriter, r *http.Request) {
	accountID, ok := a.requireAuth(w, r)
	if !ok {
		return
	}
	clientID := a.clientIDForAccount(accountID)
	r.ParseForm()
	svc := r.FormValue("service_name")
	kw := r.FormValue("keyword")
	if svc == "" || kw == "" {
		http.Error(w, "service_name and keyword required", http.StatusBadRequest)
		return
	}
	db.AddServiceKeyword(a.DB, clientID, svc, kw)

	kws, _ := db.ListServiceKeywords(a.DB, clientID)
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	fmt.Fprint(w, renderKeywordTable(kws))
}

func (a *App) DeleteServiceKeywordHandler(w http.ResponseWriter, r *http.Request) {
	accountID, ok := a.requireAuth(w, r)
	if !ok {
		return
	}
	clientID := a.clientIDForAccount(accountID)
	kwID, _ := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	db.DeleteServiceKeyword(a.DB, clientID, kwID)

	kws, _ := db.ListServiceKeywords(a.DB, clientID)
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	fmt.Fprint(w, renderKeywordTable(kws))
}

func (a *App) AddLeadStatusHandler(w http.ResponseWriter, r *http.Request) {
	accountID, ok := a.requireAuth(w, r)
	if !ok {
		return
	}
	clientID := a.clientIDForAccount(accountID)
	r.ParseForm()
	statusName := r.FormValue("status_name")
	if statusName == "" {
		http.Error(w, "status_name required", http.StatusBadRequest)
		return
	}
	db.AddLeadStatus(a.DB, clientID, statusName)

	statuses, _ := db.ListLeadStatuses(a.DB, clientID)
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	fmt.Fprint(w, renderStatusTable(statuses))
}

func (a *App) DeleteLeadStatusHandler(w http.ResponseWriter, r *http.Request) {
	accountID, ok := a.requireAuth(w, r)
	if !ok {
		return
	}
	clientID := a.clientIDForAccount(accountID)
	statusID, _ := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	db.DeleteLeadStatus(a.DB, clientID, statusID)

	statuses, _ := db.ListLeadStatuses(a.DB, clientID)
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	fmt.Fprint(w, renderStatusTable(statuses))
}

func buildServiceSelectOptions(services []string) string {
	out := ""
	for _, s := range services {
		if s == "Não especificou" {
			continue
		}
		out += fmt.Sprintf(`<option value="%s">%s</option>`, htmlEscape(s), htmlEscape(s))
	}
	return out
}

func renderKeywordTable(kws []db.ServiceKeyword) string {
	out := `<div id="keywordTable"><table class="data-table"><thead><tr><th>Service</th><th>Keyword</th><th>Actions</th></tr></thead><tbody>`
	if len(kws) == 0 {
		out += `<tr><td colspan="3" class="text-zinc-500 text-sm py-4">No keywords defined.</td></tr>`
	}
	for _, kw := range kws {
		out += fmt.Sprintf(`
    <tr>
        <td class="text-zinc-200">%s</td>
        <td class="font-mono text-xs text-amber-400">%s</td>
        <td>
            <form hx-delete="/leads/keywords/%d" hx-target="#keywordTable" hx-swap="outerHTML" style="display:inline">
                <button type="submit" class="btn-danger btn-sm">Remove</button>
            </form>
        </td>
    </tr>`, htmlEscape(kw.ServiceName), htmlEscape(kw.Keyword), kw.KeywordID)
	}
	out += `</tbody></table></div>`
	return out
}

func renderStatusTable(statuses []db.LeadStatus) string {
	out := `<div id="statusTable"><table class="data-table"><thead><tr><th>Status</th><th>Actions</th></tr></thead><tbody>`
	if len(statuses) == 0 {
		out += `<tr><td colspan="2" class="text-zinc-500 text-sm py-4">No statuses defined.</td></tr>`
	}
	for _, s := range statuses {
		out += fmt.Sprintf(`
    <tr>
        <td><span class="pill pill-zinc">%s</span></td>
        <td>
            <form hx-delete="/leads/statuses/%d" hx-target="#statusTable" hx-swap="outerHTML" style="display:inline">
                <button type="submit" class="btn-danger btn-sm">Remove</button>
            </form>
        </td>
    </tr>`, htmlEscape(s.StatusName), s.StatusID)
	}
	out += `</tbody></table></div>`
	return out
}

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

func LeadKeywordsPage(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).LeadKeywordsPage(w, r)
}
func AddServiceKeyword(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).AddServiceKeyword(w, r)
}
func DeleteServiceKeywordHandler(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).DeleteServiceKeywordHandler(w, r)
}
func AddLeadStatusHandler(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).AddLeadStatusHandler(w, r)
}
func DeleteLeadStatusHandler(w http.ResponseWriter, r *http.Request) {
	(&App{DB: DB, WAConnector: WAConnector}).DeleteLeadStatusHandler(w, r)
}