package main

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

func (app *App) handleListDepartments(w http.ResponseWriter, r *http.Request) {
	depts, err := app.listDepartments("")
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	writeJSON(w, depts)
}

func (app *App) handleCreateDepartment(w http.ResponseWriter, r *http.Request) {
	var d Department
	if err := json.NewDecoder(r.Body).Decode(&d); err != nil {
		writeError(w, "invalid request", http.StatusBadRequest)
		return
	}
	if d.Name == "" {
		writeError(w, "name is required", http.StatusBadRequest)
		return
	}
	if d.Color == "" {
		d.Color = "#6366f1"
	}
	created, err := app.createDepartment(d)
	if err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusCreated)
	writeJSON(w, created)
}

func (app *App) handleUpdateDepartment(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.Atoi(r.PathValue("id"))
	if err != nil {
		writeError(w, "invalid id", http.StatusBadRequest)
		return
	}
	var d Department
	if err := json.NewDecoder(r.Body).Decode(&d); err != nil {
		writeError(w, "invalid request", http.StatusBadRequest)
		return
	}
	if d.Name == "" {
		writeError(w, "name is required", http.StatusBadRequest)
		return
	}
	d.ID = id
	if err := app.updateDepartment(d); err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	updated, _ := app.getDepartment(id)
	writeJSON(w, updated)
}

func (app *App) handleDeleteDepartment(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.deleteDepartment(id); err != nil {
		writeError(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.WriteHeader(http.StatusNoContent)
}