package handler

import (
	"crypto/rand"
	"encoding/hex"
	"fmt"
	"net/http"
	"strings"
	"time"

	"dealroom/internal/model"
	"dealroom/templates"

	"golang.org/x/crypto/bcrypt"
)

func (h *Handler) handleTeam(w http.ResponseWriter, r *http.Request) {
	profile := getProfile(r.Context())

	rows, err := h.db.Query("SELECT id, email, full_name, role, created_at FROM profiles WHERE organization_id = ? ORDER BY full_name", profile.OrganizationID)
	if err != nil {
		http.Error(w, "Error loading team", 500)
		return
	}
	defer rows.Close()

	var members []*model.Profile
	for rows.Next() {
		m := &model.Profile{}
		rows.Scan(&m.ID, &m.Email, &m.FullName, &m.Role, &m.CreatedAt)
		members = append(members, m)
	}

	templates.TeamPage(profile, members).Render(r.Context(), w)
}

func (h *Handler) handleInviteCreate(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}
	profile := getProfile(r.Context())
	if profile.Role != "owner" && profile.Role != "admin" {
		http.Error(w, "Forbidden", http.StatusForbidden)
		return
	}

	email := strings.TrimSpace(r.FormValue("email"))
	role := r.FormValue("role")
	if email == "" {
		http.Error(w, "Email is required", 400)
		return
	}
	if role == "" {
		role = "member"
	}

	// Generate 32-byte hex token
	b := make([]byte, 32)
	rand.Read(b)
	token := hex.EncodeToString(b)

	expiresAt := time.Now().Add(7 * 24 * time.Hour)

	_, err := h.db.Exec("INSERT INTO invites (token, org_id, email, role, invited_by, expires_at) VALUES (?, ?, ?, ?, ?, ?)",
		token, profile.OrganizationID, email, role, profile.ID, expiresAt)
	if err != nil {
		http.Error(w, "Error creating invite", 500)
		return
	}

	// Return the invite link as HTML partial for HTMX
	inviteLink := fmt.Sprintf("/invites/accept?token=%s", token)
	w.Header().Set("Content-Type", "text/html")
	fmt.Fprintf(w, `<div class="p-4 bg-gray-800 rounded-lg border border-gray-700">
		<p class="text-sm text-gray-300 mb-2">Invite link for <span class="font-medium text-teal-400">%s</span>:</p>
		<div class="flex items-center gap-2">
			<input type="text" readonly value="%s" id="inviteLink" class="flex-1 px-3 py-2 bg-gray-900 border border-gray-700 rounded-lg text-xs text-gray-100 font-mono"/>
			<button onclick="navigator.clipboard.writeText(document.getElementById('inviteLink').value); this.textContent='Copied!'" class="px-3 py-2 bg-teal-500 text-white text-xs rounded-lg hover:bg-teal-600 transition">Copy</button>
		</div>
		<p class="text-xs text-gray-500 mt-2">Expires in 7 days. Role: %s</p>
	</div>`, email, inviteLink, role)
}

func (h *Handler) handleInviteAcceptPage(w http.ResponseWriter, r *http.Request) {
	token := r.URL.Query().Get("token")
	if token == "" {
		http.Error(w, "Invalid invite link", 400)
		return
	}

	var email, orgName string
	err := h.db.QueryRow(`SELECT i.email, o.name FROM invites i JOIN organizations o ON i.org_id = o.id WHERE i.token = ? AND i.expires_at > datetime('now') AND i.used_at IS NULL`, token).Scan(&email, &orgName)
	if err != nil {
		http.Error(w, "Invite is invalid or expired", 400)
		return
	}

	templates.InviteAccept(token, email, orgName).Render(r.Context(), w)
}

func (h *Handler) handleInviteAccept(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	token := r.FormValue("token")
	name := strings.TrimSpace(r.FormValue("name"))
	password := r.FormValue("password")

	if token == "" || name == "" || password == "" {
		http.Error(w, "All fields are required", 400)
		return
	}

	var invite model.Invite
	err := h.db.QueryRow(`SELECT token, org_id, email, role FROM invites WHERE token = ? AND expires_at > datetime('now') AND used_at IS NULL`, token).Scan(&invite.Token, &invite.OrgID, &invite.Email, &invite.Role)
	if err != nil {
		http.Error(w, "Invite is invalid or expired", 400)
		return
	}

	// Create profile
	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		http.Error(w, "Error creating account", 500)
		return
	}

	userID := generateID("user")
	_, err = h.db.Exec("INSERT INTO profiles (id, email, full_name, organization_id, role, password_hash) VALUES (?, ?, ?, ?, ?, ?)",
		userID, invite.Email, name, invite.OrgID, invite.Role, string(hash))
	if err != nil {
		http.Error(w, "Error creating account (email may already exist)", 400)
		return
	}

	// Mark invite as used
	h.db.Exec("UPDATE invites SET used_at = datetime('now') WHERE token = ?", token)

	// Auto login
	h.createSession(w, userID)

	http.Redirect(w, r, "/", http.StatusSeeOther)
}