package main

import (
	"encoding/csv"
	"encoding/json"
	"net/http"
	"strconv"
)

func (app *App) handleListParticipants(w http.ResponseWriter, r *http.Request) {
	search := r.URL.Query().Get("search")
	participants, err := app.listParticipants(search, "")
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	total, checkedIn, _ := app.ticketCounts()
	types, _ := app.ticketTypes()
	writeJSON(w, map[string]any{
		"participants": participants,
		"total":        total,
		"checked_in":   checkedIn,
		"ticket_types": types,
	})
}

func (app *App) handleGetParticipant(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, "invalid id", http.StatusBadRequest)
		return
	}
	p, err := app.getParticipant(id)
	if err != nil || p == nil {
		writeError(w, "not found", http.StatusNotFound)
		return
	}
	tickets, _ := app.listTickets(&id, "")
	writeJSON(w, map[string]any{"participant": p, "tickets": tickets})
}

func (app *App) handleCreateParticipant(w http.ResponseWriter, r *http.Request) {
	var p Participant
	if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
		writeError(w, "invalid request", http.StatusBadRequest)
		return
	}
	if p.PreferredName == "" && p.Email == "" {
		writeError(w, "name or email is required", http.StatusBadRequest)
		return
	}
	created, err := app.createParticipant(p)
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusCreated)
	writeJSON(w, created)
}

func (app *App) handleUpdateParticipant(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, "invalid id", http.StatusBadRequest)
		return
	}
	var p Participant
	if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
		writeError(w, "invalid request", http.StatusBadRequest)
		return
	}
	p.ID = id
	if err := app.updateParticipant(p); err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	updated, _ := app.getParticipant(id)
	writeJSON(w, updated)
}

func (app *App) handleDeleteParticipant(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, "invalid id", http.StatusBadRequest)
		return
	}
	if err := app.deleteParticipant(id); err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusNoContent)
}

// handleMergeParticipants reassigns all tickets and volunteers from otherID to
// canonicalID, then soft-deletes the other participant.
func (app *App) handleMergeParticipants(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, "invalid id", http.StatusBadRequest)
		return
	}
	otherID, err := strconv.Atoi(r.PathValue("other_id"))
	if err != nil {
		writeError(w, "invalid other_id", http.StatusBadRequest)
		return
	}
	if err := app.mergeParticipants(id, otherID); err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	p, _ := app.getParticipant(id)
	tickets, _ := app.listTickets(&id, "")
	writeJSON(w, map[string]any{"participant": p, "tickets": tickets})
}

func (app *App) handleExportParticipants(w http.ResponseWriter, r *http.Request) {
	participants, err := app.listParticipants("", "")
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "text/csv")
	w.Header().Set("Content-Disposition", `attachment; filename="participants.csv"`)
	wr := csv.NewWriter(w)
	wr.Write([]string{"id", "email", "preferred_name", "phone", "pronouns", "note"})
	for _, p := range participants {
		wr.Write([]string{
			strconv.Itoa(p.ID), p.Email, p.PreferredName, p.Phone, p.Pronouns, p.Note,
		})
	}
	wr.Flush()
}

func (app *App) handleCreateTicket(w http.ResponseWriter, r *http.Request) {
	var t Ticket
	if err := json.NewDecoder(r.Body).Decode(&t); err != nil {
		writeError(w, "invalid request", http.StatusBadRequest)
		return
	}
	if t.ParticipantID == nil {
		writeError(w, "participant_id is required", http.StatusBadRequest)
		return
	}
	if t.Source == "" {
		t.Source = "manual"
	}
	created, err := app.createTicket(t)
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusCreated)
	writeJSON(w, created)
}

func (app *App) handleListTickets(w http.ResponseWriter, r *http.Request) {
	tickets, err := app.listTickets(nil, "")
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	writeJSON(w, map[string]any{"tickets": tickets})
}

func (app *App) handleCheckInTicket(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, "invalid id", http.StatusBadRequest)
		return
	}
	claims := claimsFromContext(r)
	tk, err := app.checkInTicket(id, claims.ParticipantID)
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	app.broker.publish("checkin", map[string]any{"type": "ticket", "ticket": tk})
	writeJSON(w, map[string]any{"ticket": tk})
}