package projects

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"
)

type Handler struct{ svc *Service }

func NewHandler(svc *Service) *Handler { return &Handler{svc: svc} }

type createRequest struct {
	ClientName string `json:"client_name" binding:"required,min=1,max=64"`
	// Months : durée souscrite, 1 à 12.
	Months        int    `json:"months" binding:"required,min=1,max=12"`
	AdminUsername string `json:"admin_username" binding:"required,min=3,max=64,alphanum"`
	AdminPassword string `json:"admin_password" binding:"required,min=12"`
	// AdminNumber : nombre maximum de comptes admin (ADMIN_NUMBER), 1 par défaut.
	AdminNumber int `json:"admin_number" binding:"omitempty,min=1,max=20"`
}

type extendRequest struct {
	Months int `json:"months" binding:"required,min=1,max=12"`
}

func (h *Handler) writeError(c *gin.Context, err error) {
	switch {
	case errors.Is(err, ErrNotFound):
		c.JSON(http.StatusNotFound, gin.H{"error": err.Error()})
	case errors.Is(err, ErrNotExtendable):
		c.JSON(http.StatusConflict, gin.H{"error": err.Error()})
	case errors.Is(err, ErrInvalidMonths), errors.Is(err, ErrInvalidClient), errors.Is(err, ErrInvalidAdmin),
		errors.Is(err, ErrWeakAdminPass), errors.Is(err, ErrInvalidAdminSize):
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
	default:
		c.JSON(http.StatusInternalServerError, gin.H{"error": "erreur serveur"})
	}
}

// Create : POST /projects — déploie un projet pour la durée souscrite
// (202 Accepted, déploiement asynchrone).
func (h *Handler) Create(c *gin.Context) {
	var req createRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "requête invalide"})
		return
	}
	p, err := h.svc.Create(CreateInput{
		ClientName:    req.ClientName,
		Months:        req.Months,
		AdminUsername: req.AdminUsername,
		AdminPassword: req.AdminPassword,
		AdminNumber:   req.AdminNumber,
	})
	if err != nil {
		h.writeError(c, err)
		return
	}
	c.JSON(http.StatusAccepted, p)
}

// List : GET /projects.
func (h *Handler) List(c *gin.Context) {
	items, err := h.svc.List()
	if err != nil {
		h.writeError(c, err)
		return
	}
	c.JSON(http.StatusOK, gin.H{"items": items})
}

// Get : GET /projects/:id.
func (h *Handler) Get(c *gin.Context) {
	p, err := h.svc.Get(c.Param("id"))
	if err != nil {
		h.writeError(c, err)
		return
	}
	c.JSON(http.StatusOK, p)
}

// Extend : POST /projects/:id/extend {"months": 1..12} — renouvelle
// l'abonnement (relance un projet suspendu).
func (h *Handler) Extend(c *gin.Context) {
	var req extendRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": ErrInvalidMonths.Error()})
		return
	}
	p, err := h.svc.Extend(c.Param("id"), req.Months)
	if err != nil {
		h.writeError(c, err)
		return
	}
	c.JSON(http.StatusOK, p)
}

// Delete : DELETE /projects/:id — suppression immédiate (namespace, données,
// sauvegardes).
func (h *Handler) Delete(c *gin.Context) {
	p, err := h.svc.Delete(c.Param("id"))
	if err != nil {
		h.writeError(c, err)
		return
	}
	c.JSON(http.StatusOK, p)
}