package clients

import (
	"errors"
	"net/http"
	"regexp"
	"strings"

	"mira/backend/internal/auth"
	"mira/backend/internal/users"

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

type Routes struct {
	store Store
}

func NewRoutes(store Store) Routes {
	return Routes{store: store}
}

func (r Routes) Register(router *gin.RouterGroup, requireAuth gin.HandlerFunc) {
	router.Use(requireAuth)

	router.GET("", r.list)
	router.POST("", r.create)
	router.GET("/:clientId", r.get)
	router.PATCH("/:clientId", r.update)
	router.DELETE("/:clientId", r.delete)
}

func (r Routes) list(c *gin.Context) {
	claims, ok := auth.ClaimsFromContext(c)
	if !ok {
		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
		return
	}

	var clients []Client
	var err error
	if claims.Role == users.RoleSuperAdmin || claims.Role == users.RoleAgencyUser {
		clients, err = r.store.List(c.Request.Context())
	} else {
		clients, err = r.store.ListForUser(c.Request.Context(), claims.UserID)
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel listar clientes."})
		return
	}

	c.JSON(http.StatusOK, gin.H{"clients": clients})
}

type createClientRequest struct {
	Name string `json:"name" binding:"required,min=2"`
}

func (r Routes) create(c *gin.Context) {
	claims, ok := auth.ClaimsFromContext(c)
	if !ok || claims.Role != users.RoleSuperAdmin {
		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
		return
	}

	var input createClientRequest
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"message": "Informe um nome de cliente valido."})
		return
	}

	client, err := r.store.Create(c.Request.Context(), input.Name)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel criar o cliente."})
		return
	}

	c.JSON(http.StatusCreated, gin.H{"client": client})
}

func (r Routes) get(c *gin.Context) {
	if !r.canReadClient(c, c.Param("clientId")) {
		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
		return
	}

	client, err := r.store.FindByID(c.Request.Context(), c.Param("clientId"))
	if errors.Is(err, ErrNotFound) {
		c.JSON(http.StatusNotFound, gin.H{"message": "Cliente nao encontrado."})
		return
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar o cliente."})
		return
	}

	c.JSON(http.StatusOK, gin.H{"client": client})
}

type updateClientRequest struct {
	Name         string `json:"name"`
	Status       string `json:"status"`
	WebsiteURL   string `json:"website_url"`
	InstagramURL string `json:"instagram_url"`
	FacebookURL  string `json:"facebook_url"`
	LinkedinURL  string `json:"linkedin_url"`
	Color        string `json:"color"`
	Notes        string `json:"notes"`
}

func (r Routes) update(c *gin.Context) {
	claims, ok := auth.ClaimsFromContext(c)
	if !ok || claims.Role != users.RoleSuperAdmin {
		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
		return
	}

	var input updateClientRequest
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"message": "Dados invalidos."})
		return
	}

	color := strings.TrimSpace(input.Color)
	if color != "" && !hexColorPattern.MatchString(color) {
		c.JSON(http.StatusBadRequest, gin.H{"message": "Cor invalida."})
		return
	}

	client, err := r.store.Update(c.Request.Context(), c.Param("clientId"), input.Name, input.Status, input.WebsiteURL, input.InstagramURL, input.FacebookURL, input.LinkedinURL, color, input.Notes)
	if errors.Is(err, ErrNotFound) {
		c.JSON(http.StatusNotFound, gin.H{"message": "Cliente nao encontrado."})
		return
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel atualizar o cliente."})
		return
	}

	c.JSON(http.StatusOK, gin.H{"client": client})
}

var hexColorPattern = regexp.MustCompile(`^#[0-9a-fA-F]{6}$`)

func (r Routes) archive(c *gin.Context) {
	claims, ok := auth.ClaimsFromContext(c)
	if !ok || claims.Role != users.RoleSuperAdmin {
		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
		return
	}

	client, err := r.store.Archive(c.Request.Context(), c.Param("clientId"))
	if errors.Is(err, ErrNotFound) {
		c.JSON(http.StatusNotFound, gin.H{"message": "Cliente nao encontrado."})
		return
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel arquivar o cliente."})
		return
	}

	c.JSON(http.StatusOK, gin.H{"client": client})
}

func (r Routes) delete(c *gin.Context) {
	claims, ok := auth.ClaimsFromContext(c)
	if !ok || claims.Role != users.RoleSuperAdmin {
		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
		return
	}

	err := r.store.Delete(c.Request.Context(), c.Param("clientId"))
	if errors.Is(err, ErrNotFound) {
		c.JSON(http.StatusNotFound, gin.H{"message": "Cliente nao encontrado."})
		return
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel excluir o cliente."})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "Cliente excluido."})
}

func (r Routes) canReadClient(c *gin.Context, clientID string) bool {
	claims, ok := auth.ClaimsFromContext(c)
	if !ok {
		return false
	}
	if claims.Role == users.RoleSuperAdmin || claims.Role == users.RoleAgencyUser {
		return true
	}

	allowed, err := r.store.UserCanAccess(c.Request.Context(), claims.UserID, clientID)
	return err == nil && allowed
}