package handler

import (
	"net/http"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"

	"github.com/yuxingu/digital-psychology/apps/api/internal/middleware"
	"github.com/yuxingu/digital-psychology/apps/api/internal/repository"
	"github.com/yuxingu/digital-psychology/apps/api/pkg/response"
)

// GrowthHandler exposes growth plans and mood trail.
type GrowthHandler struct {
	Plans *repository.GrowthRepo
}

// Register mounts growth routes.
func (h *GrowthHandler) Register(rg *gin.RouterGroup) {
	rg.GET("/growth/plans", h.ListPlans)
	rg.POST("/growth/plans", h.CreatePlan)
	rg.POST("/growth/plans/:id/checkin", h.Checkin)
	rg.GET("/growth/plans/:id/checkins", h.ListCheckins)
	rg.GET("/moods/recent", h.MoodsRecent)
}

// ListPlans handles GET /growth/plans.
func (h *GrowthHandler) ListPlans(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	items, err := h.Plans.ListPlans(c.Request.Context(), userID)
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"items": items})
}

// CreatePlan handles POST /growth/plans.
func (h *GrowthHandler) CreatePlan(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	var req struct {
		Title string `json:"title" binding:"required"`
		Focus string `json:"focus"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid request")
		return
	}
	title := strings.TrimSpace(req.Title)
	if title == "" || len([]rune(title)) > 40 {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid title")
		return
	}
	p, err := h.Plans.CreatePlan(c.Request.Context(), userID, title, strings.TrimSpace(req.Focus))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 30020, err.Error())
		return
	}
	response.OK(c, p)
}

// Checkin handles POST /growth/plans/:id/checkin.
func (h *GrowthHandler) Checkin(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	pid, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid id")
		return
	}
	var req struct {
		Note *string `json:"note"`
	}
	_ = c.ShouldBindJSON(&req)
	out, err := h.Plans.Checkin(c.Request.Context(), userID, pid, time.Now(), req.Note)
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 30021, err.Error())
		return
	}
	response.OK(c, out)
}

// ListCheckins handles GET /growth/plans/:id/checkins.
func (h *GrowthHandler) ListCheckins(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	pid, err := uuid.Parse(c.Param("id"))
	if err != nil {
		response.Fail(c, http.StatusBadRequest, 10000, "invalid id")
		return
	}
	items, err := h.Plans.ListCheckinsRecent(c.Request.Context(), userID, pid, 14)
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"items": items})
}

// MoodsRecent handles GET /moods/recent.
func (h *GrowthHandler) MoodsRecent(c *gin.Context) {
	userID, ok := middleware.UserIDFromContext(c)
	if !ok {
		response.Fail(c, http.StatusUnauthorized, 40100, "unauthorized")
		return
	}
	items, err := h.Plans.ListMoodsRecent(c.Request.Context(), userID, 7)
	if err != nil {
		response.Fail(c, http.StatusInternalServerError, 50000, err.Error())
		return
	}
	response.OK(c, gin.H{"items": items})
}