package handler

import (
	"net/http"
	"strconv"
	"time"

	"lifelog/internal/model"
	"lifelog/internal/service"

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

type Handler struct {
	todoSvc      *service.TodoService
	dailyLogSvc  *service.DailyLogService
	financeSvc   *service.FinanceService
}

func NewHandler(todoSvc *service.TodoService, dailyLogSvc *service.DailyLogService, financeSvc *service.FinanceService) *Handler {
	return &Handler{todoSvc: todoSvc, dailyLogSvc: dailyLogSvc, financeSvc: financeSvc}
}

// Todo handlers

func (h *Handler) GetTodos(c *gin.Context) {
	todos, err := h.todoSvc.GetAll()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": todos})
}

func (h *Handler) CreateTodo(c *gin.Context) {
	var req struct {
		Title    string `json:"title" binding:"required"`
		Priority int    `json:"priority"`
		DueDate  string `json:"due_date"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if req.Priority == 0 {
		req.Priority = 2
	}
	var dueDate *time.Time
	if req.DueDate != "" {
		t, err := time.Parse("2006-01-02", req.DueDate)
		if err == nil {
			dueDate = &t
		}
	}
	todo, err := h.todoSvc.Create(req.Title, req.Priority, dueDate)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusCreated, gin.H{"data": todo})
}

func (h *Handler) UpdateTodo(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}
	var req struct {
		Title    string `json:"title" binding:"required"`
		Priority int    `json:"priority"`
		Done     bool   `json:"done"`
		DueDate  string `json:"due_date"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	var dueDate *time.Time
	if req.DueDate != "" {
		t, err := time.Parse("2006-01-02", req.DueDate)
		if err == nil {
			dueDate = &t
		}
	}
	todo, err := h.todoSvc.Update(id, req.Title, req.Priority, req.Done, dueDate)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": todo})
}

func (h *Handler) ToggleTodo(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}
	todo, err := h.todoSvc.ToggleDone(id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": todo})
}

func (h *Handler) DeleteTodo(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}
	err = h.todoSvc.Delete(id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "deleted"})
}

// DailyLog handlers

func (h *Handler) GetDailyLog(c *gin.Context) {
	date := c.Param("date")
	if date == "" {
		date = time.Now().Format("2006-01-02")
	}
	log, err := h.dailyLogSvc.GetByDate(date)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": log})
}

func (h *Handler) GetRecentLogs(c *gin.Context) {
	limitStr := c.DefaultQuery("limit", "30")
	limit, _ := strconv.Atoi(limitStr)
	logs, err := h.dailyLogSvc.GetRecent(limit)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": logs})
}

func (h *Handler) SaveDailyLog(c *gin.Context) {
	date := c.Param("date")
	if date == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "date is required"})
		return
	}
	var req struct {
		Morning   string `json:"morning"`
		Afternoon string `json:"afternoon"`
		Evening   string `json:"evening"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	log, err := h.dailyLogSvc.Save(date, req.Morning, req.Afternoon, req.Evening)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": log})
}

// Finance handlers

func (h *Handler) GetFinanceByYear(c *gin.Context) {
	yearStr := c.Param("year")
	year, err := strconv.Atoi(yearStr)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid year"})
		return
	}
	entries, err := h.financeSvc.GetByYear(year)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"data": entries})
}

func (h *Handler) CreateFinanceEntry(c *gin.Context) {
	var req struct {
		Year        int     `json:"year" binding:"required"`
		Month       int     `json:"month"`
		Type        string  `json:"type" binding:"required"` // income / expense
		Category    string  `json:"category" binding:"required"` // fixed / extra
		Description string  `json:"description"`
		Amount      float64 `json:"amount" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	entry := &model.FinanceEntry{
		Year:        req.Year,
		Month:       req.Month,
		Type:        req.Type,
		Category:    req.Category,
		Description: req.Description,
		Amount:      req.Amount,
	}
	if err := h.financeSvc.Create(entry); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusCreated, gin.H{"data": entry})
}

func (h *Handler) UpdateFinanceEntry(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}
	var req struct {
		Year        int     `json:"year"`
		Month       int     `json:"month"`
		Type        string  `json:"type"`
		Category    string  `json:"category"`
		Description string  `json:"description"`
		Amount      float64 `json:"amount"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	err = h.financeSvc.Update(&model.FinanceEntry{
		ID:          id,
		Year:        req.Year,
		Month:       req.Month,
		Type:        req.Type,
		Category:    req.Category,
		Description: req.Description,
		Amount:      req.Amount,
	})
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "updated"})
}

func (h *Handler) DeleteFinanceEntry(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}
	if err := h.financeSvc.Delete(id); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "deleted"})
}