package web

import (
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"git.t5de.dev/t5de/t5de-hub/internal/store"
)

// The moderation console: counts, who's online, people (search, link caps, bans, roles), and the audit log.

func (s *Server) console(q *request) error {
	counts, err := s.Store.Counts(s.ctx(q))
	if err != nil {
		return err
	}
	log, err := s.Store.AuditLog(s.ctx(q), 50)
	if err != nil {
		return err
	}
	s.render(q, "console", map[string]any{"Counts": counts, "Connections": s.Realtime.Connections(),
		"Online": s.visibleOnline(q), "Audit": log})
	return nil
}

func (s *Server) consoleOnline(q *request) error {
	s.fragment(q, "console", "console-online", map[string]any{"Online": s.visibleOnline(q), "Connections": s.Realtime.Connections()})
	return nil
}

func (s *Server) consolePeople(q *request) error {
	search := strings.TrimSpace(q.r.URL.Query().Get("q"))
	people, err := s.Store.People(s.ctx(q), search, 100)
	if err != nil {
		return err
	}
	s.render(q, "console_people", map[string]any{"People": people, "Search": search})
	return nil
}

func (s *Server) personParam(q *request) (*store.Person, error) {
	id, err := strconv.ParseInt(q.r.PathValue("id"), 10, 64)
	if err != nil {
		return nil, fail(http.StatusNotFound, "No such person.")
	}
	p, err := s.Store.PersonByID(s.ctx(q), id)
	if errors.Is(err, store.ErrNotFound) {
		return nil, fail(http.StatusNotFound, "No such person.")
	}
	return p, err
}

func (s *Server) consolePerson(q *request) error {
	p, err := s.personParam(q)
	if err != nil {
		return err
	}
	links, err := s.Store.Links(s.ctx(q), p.ID)
	if err != nil {
		return err
	}
	signins, err := s.Store.Signins(s.ctx(q), p.ID)
	if err != nil {
		return err
	}
	s.render(q, "console_person", map[string]any{"Subject": p, "Links": links, "Signins": signins})
	return nil
}

func (s *Server) setCap(q *request) error {
	p, err := s.personParam(q)
	if err != nil {
		return err
	}
	cap, err := strconv.Atoi(q.r.PostFormValue("cap"))
	if err != nil || cap < 0 || cap > 1000 {
		return fail(http.StatusBadRequest, "The link cap is a number from 0 to 1000.")
	}
	if err := s.Store.SetLinkCap(s.ctx(q), p.ID, cap); err != nil {
		return err
	}
	s.Store.Audit(s.ctx(q), q.person.ID, "person.link_cap", p.Username, map[string]any{"from": p.LinkCap, "to": cap})
	return q.redirect(fmt.Sprintf("/console/people/%d", p.ID), fmt.Sprintf("%s can link %d accounts.", p.Username, cap))
}

func (s *Server) ban(q *request) error {
	p, err := s.personParam(q)
	if err != nil {
		return err
	}
	if p.ID == q.person.ID {
		return fail(http.StatusBadRequest, "You can't ban yourself.")
	}
	if p.IsModerator() && !q.person.IsAdmin() {
		return fail(http.StatusForbidden, "Only admins can ban moderators.")
	}
	reason := strings.TrimSpace(q.r.PostFormValue("reason"))
	if reason == "" || len(reason) > 500 {
		return fail(http.StatusBadRequest, "Give a reason (up to 500 characters); the person sees it.")
	}
	if err := s.Store.SetBanned(s.ctx(q), p.ID, true, reason); err != nil {
		return err
	}
	s.Realtime.Disconnect(p.ID)
	s.Store.Audit(s.ctx(q), q.person.ID, "person.ban", p.Username, map[string]any{"reason": reason})
	return q.redirect(fmt.Sprintf("/console/people/%d", p.ID), "Banned "+p.Username+".")
}

func (s *Server) unban(q *request) error {
	p, err := s.personParam(q)
	if err != nil {
		return err
	}
	if err := s.Store.SetBanned(s.ctx(q), p.ID, false, ""); err != nil {
		return err
	}
	s.Store.Audit(s.ctx(q), q.person.ID, "person.unban", p.Username, nil)
	return q.redirect(fmt.Sprintf("/console/people/%d", p.ID), "Unbanned "+p.Username+".")
}

func (s *Server) setRole(q *request) error {
	p, err := s.personParam(q)
	if err != nil {
		return err
	}
	role := q.r.PostFormValue("role")
	if role != "user" && role != "moderator" && role != "admin" {
		return fail(http.StatusBadRequest, "No such role.")
	}
	if p.ID == q.person.ID {
		return fail(http.StatusBadRequest, "Another admin has to change your role.")
	}
	if err := s.Store.SetRole(s.ctx(q), p.ID, role); err != nil {
		return err
	}
	s.Store.Audit(s.ctx(q), q.person.ID, "person.role", p.Username, map[string]any{"from": p.Role, "to": role})
	return q.redirect(fmt.Sprintf("/console/people/%d", p.ID), p.Username+" is now "+role+".")
}