package model

import (
	"database/sql"
	"time"
)

type FinanceCategory struct {
	ID        int64          `db:"id" json:"id"`
	UserID    int64          `db:"user_id" json:"user_id"`
	Name      string         `db:"name" json:"name"`
	Emoji     string         `db:"emoji" json:"emoji"`
	Type      string         `db:"type" json:"type"`
	Budget    sql.NullFloat64 `db:"budget" json:"-"`
	BudgetVal *float64       `db:"-" json:"budget"`
	Color     string         `db:"color" json:"color"`
	SortOrder int            `db:"sort_order" json:"sort_order"`
	CreatedAt time.Time      `db:"created_at" json:"created_at"`
}

func (c *FinanceCategory) ProcessForJSON() {
	if c.Budget.Valid {
		c.BudgetVal = &c.Budget.Float64
	}
}

type FinanceTransaction struct {
	ID           int64     `db:"id" json:"id"`
	UserID       int64     `db:"user_id" json:"user_id"`
	CategoryID   int64     `db:"category_id" json:"category_id"`
	Type         string    `db:"type" json:"type"`
	Amount       float64   `db:"amount" json:"amount"`
	Description  string    `db:"description" json:"description"`
	Date         time.Time `db:"date" json:"date"`
	CreatedAt    time.Time `db:"created_at" json:"created_at"`
	// Joined fields
	CategoryName  string `db:"category_name" json:"category_name,omitempty"`
	CategoryEmoji string `db:"category_emoji" json:"category_emoji,omitempty"`
}

type CreateFinanceCategoryRequest struct {
	Name      string   `json:"name"`
	Emoji     string   `json:"emoji,omitempty"`
	Type      string   `json:"type"`
	Budget    *float64 `json:"budget,omitempty"`
	Color     string   `json:"color,omitempty"`
	SortOrder int      `json:"sort_order,omitempty"`
}

type UpdateFinanceCategoryRequest struct {
	Name      *string  `json:"name,omitempty"`
	Emoji     *string  `json:"emoji,omitempty"`
	Type      *string  `json:"type,omitempty"`
	Budget    *float64 `json:"budget,omitempty"`
	Color     *string  `json:"color,omitempty"`
	SortOrder *int     `json:"sort_order,omitempty"`
}

type CreateFinanceTransactionRequest struct {
	CategoryID  int64   `json:"category_id"`
	Type        string  `json:"type"`
	Amount      float64 `json:"amount"`
	Description string  `json:"description,omitempty"`
	Date        string  `json:"date"`
}

type UpdateFinanceTransactionRequest struct {
	CategoryID  *int64   `json:"category_id,omitempty"`
	Type        *string  `json:"type,omitempty"`
	Amount      *float64 `json:"amount,omitempty"`
	Description *string  `json:"description,omitempty"`
	Date        *string  `json:"date,omitempty"`
}

type FinanceSummary struct {
	Balance      float64              `json:"balance"`
	TotalIncome  float64              `json:"total_income"`
	TotalExpense float64              `json:"total_expense"`
	ByCategory   []CategorySummary    `json:"by_category"`
	Daily        []DailySummary       `json:"daily"`
}

type CategorySummary struct {
	CategoryID   int64   `json:"category_id" db:"category_id"`
	CategoryName string  `json:"category_name" db:"category_name"`
	CategoryEmoji string `json:"category_emoji" db:"category_emoji"`
	Type         string  `json:"type" db:"type"`
	Amount       float64 `json:"amount" db:"amount"`
	Percentage   float64 `json:"percentage"`
	Budget       *float64 `json:"budget,omitempty"`
}

type DailySummary struct {
	Date   string  `json:"date" db:"date"`
	Amount float64 `json:"amount" db:"amount"`
}

type FinanceAnalytics struct {
	MonthlyTrend       []MonthlyTrend  `json:"monthly_trend"`
	AvgDailyExpense    float64         `json:"avg_daily_expense"`
	ComparisonPrevMonth Comparison     `json:"comparison_prev_month"`
}

type MonthlyTrend struct {
	Month   string  `json:"month" db:"month"`
	Income  float64 `json:"income" db:"income"`
	Expense float64 `json:"expense" db:"expense"`
}

type Comparison struct {
	Current     float64 `json:"current"`
	Previous    float64 `json:"previous"`
	DiffPercent float64 `json:"diff_percent"`
}