package model

import (
	"database/sql"
	"time"
)

type SavingsCategory struct {
	ID          int64  `db:"id" json:"id"`
	UserID      int64  `db:"user_id" json:"user_id"`
	Name        string `db:"name" json:"name"`
	Description string `db:"description" json:"description"`

	// Type flags
	IsDeposit   bool `db:"is_deposit" json:"is_deposit"`
	IsCredit    bool `db:"is_credit" json:"is_credit"`
	IsAccount   bool `db:"is_account" json:"is_account"`
	IsRecurring bool `db:"is_recurring" json:"is_recurring"`
	IsMulti     bool `db:"is_multi" json:"is_multi"`
	IsClosed    bool `db:"is_closed" json:"is_closed"`

	// Initial capital
	InitialCapital float64 `db:"initial_capital" json:"initial_capital"`

	// Deposit fields
	DepositAmount    float64      `db:"deposit_amount" json:"deposit_amount"`
	InterestRate     float64      `db:"interest_rate" json:"interest_rate"`
	DepositStartDate sql.NullTime `db:"deposit_start_date" json:"-"`
	DepositStartStr  *string      `db:"-" json:"deposit_start_date"`
	DepositTerm      int          `db:"deposit_term" json:"deposit_term"`
	DepositEndDate   sql.NullTime `db:"deposit_end_date" json:"-"`
	DepositEndStr    *string      `db:"-" json:"deposit_end_date"`
	LastInterestCalc sql.NullTime `db:"last_interest_calc" json:"-"`
	FinalAmount      float64      `db:"final_amount" json:"final_amount"`

	// Credit fields
	CreditAmount    float64      `db:"credit_amount" json:"credit_amount"`
	CreditTerm      int          `db:"credit_term" json:"credit_term"`
	CreditRate      float64      `db:"credit_rate" json:"credit_rate"`
	CreditStartDate sql.NullTime `db:"credit_start_date" json:"-"`
	CreditStartStr  *string      `db:"-" json:"credit_start_date"`

	// Recurring fields
	RecurringAmount    float64      `db:"recurring_amount" json:"recurring_amount"`
	RecurringDay       int          `db:"recurring_day" json:"recurring_day"`
	RecurringStartDate sql.NullTime `db:"recurring_start_date" json:"-"`
	LastRecurringRun   sql.NullTime `db:"last_recurring_run" json:"-"`

	// Computed (populated in service)
	CurrentAmount        float64 `db:"-" json:"current_amount"`
	RecurringTotalAmount float64 `db:"-" json:"recurring_total_amount"`

	CreatedAt time.Time `db:"created_at" json:"created_at"`
	UpdatedAt time.Time `db:"updated_at" json:"updated_at"`

	// Relations
	Members []SavingsCategoryMember `db:"-" json:"members,omitempty"`
}

func (c *SavingsCategory) ProcessForJSON() {
	if c.DepositStartDate.Valid {
		formatted := c.DepositStartDate.Time.Format("2006-01-02")
		c.DepositStartStr = &formatted
	}
	if c.DepositEndDate.Valid {
		formatted := c.DepositEndDate.Time.Format("2006-01-02")
		c.DepositEndStr = &formatted
	}
	if c.CreditStartDate.Valid {
		formatted := c.CreditStartDate.Time.Format("2006-01-02")
		c.CreditStartStr = &formatted
	}
}

type SavingsTransaction struct {
	ID           int64     `db:"id" json:"id"`
	CategoryID   int64     `db:"category_id" json:"category_id"`
	UserID       int64     `db:"user_id" json:"user_id"`
	Amount       float64   `db:"amount" json:"amount"`
	Type         string    `db:"type" json:"type"` // deposit, withdrawal
	Description  string    `db:"description" json:"description"`
	Date         time.Time `db:"date" json:"date"`
	CreatedAt    time.Time `db:"created_at" json:"created_at"`
	UpdatedAt    time.Time `db:"updated_at" json:"updated_at"`
	CategoryName string    `db:"category_name" json:"category_name,omitempty"`
	UserName     string    `db:"user_name" json:"user_name,omitempty"`
}

type SavingsRecurringPlan struct {
	ID         int64          `db:"id" json:"id"`
	CategoryID int64          `db:"category_id" json:"category_id"`
	UserID     sql.NullInt64  `db:"user_id" json:"-"`
	UserIDPtr  *int64         `db:"-" json:"user_id"`
	Effective  time.Time      `db:"effective" json:"effective"`
	Amount     float64        `db:"amount" json:"amount"`
	Day        int            `db:"day" json:"day"`
	CreatedAt  time.Time      `db:"created_at" json:"created_at"`
	UpdatedAt  time.Time      `db:"updated_at" json:"updated_at"`
}

func (p *SavingsRecurringPlan) ProcessForJSON() {
	if p.UserID.Valid {
		p.UserIDPtr = &p.UserID.Int64
	}
}

type SavingsCategoryMember struct {
	ID         int64     `db:"id" json:"id"`
	CategoryID int64     `db:"category_id" json:"category_id"`
	UserID     int64     `db:"user_id" json:"user_id"`
	UserName   string    `db:"user_name" json:"user_name,omitempty"`
	CreatedAt  time.Time `db:"created_at" json:"created_at"`
}

// Request DTOs
type CreateSavingsCategoryRequest struct {
	Name               string  `json:"name"`
	Description        string  `json:"description,omitempty"`
	IsDeposit          bool    `json:"is_deposit,omitempty"`
	IsCredit           bool    `json:"is_credit,omitempty"`
	IsAccount          bool    `json:"is_account,omitempty"`
	IsRecurring        bool    `json:"is_recurring,omitempty"`
	IsMulti            bool    `json:"is_multi,omitempty"`
	InitialCapital     float64 `json:"initial_capital,omitempty"`
	DepositAmount      float64 `json:"deposit_amount,omitempty"`
	InterestRate       float64 `json:"interest_rate,omitempty"`
	DepositStartDate   *string `json:"deposit_start_date,omitempty"`
	DepositTerm        int     `json:"deposit_term,omitempty"`
	CreditAmount       float64 `json:"credit_amount,omitempty"`
	CreditTerm         int     `json:"credit_term,omitempty"`
	CreditRate         float64 `json:"credit_rate,omitempty"`
	CreditStartDate    *string `json:"credit_start_date,omitempty"`
	RecurringAmount    float64 `json:"recurring_amount,omitempty"`
	RecurringDay       int     `json:"recurring_day,omitempty"`
	RecurringStartDate *string `json:"recurring_start_date,omitempty"`
	MemberIDs          []int64 `json:"member_ids,omitempty"`
}

type UpdateSavingsCategoryRequest struct {
	Name               *string  `json:"name,omitempty"`
	Description        *string  `json:"description,omitempty"`
	IsDeposit          *bool    `json:"is_deposit,omitempty"`
	IsCredit           *bool    `json:"is_credit,omitempty"`
	IsAccount          *bool    `json:"is_account,omitempty"`
	IsRecurring        *bool    `json:"is_recurring,omitempty"`
	IsMulti            *bool    `json:"is_multi,omitempty"`
	IsClosed           *bool    `json:"is_closed,omitempty"`
	InitialCapital     *float64 `json:"initial_capital,omitempty"`
	DepositAmount      *float64 `json:"deposit_amount,omitempty"`
	InterestRate       *float64 `json:"interest_rate,omitempty"`
	DepositStartDate   *string  `json:"deposit_start_date,omitempty"`
	DepositTerm        *int     `json:"deposit_term,omitempty"`
	FinalAmount        *float64 `json:"final_amount,omitempty"`
	CreditAmount       *float64 `json:"credit_amount,omitempty"`
	CreditTerm         *int     `json:"credit_term,omitempty"`
	CreditRate         *float64 `json:"credit_rate,omitempty"`
	CreditStartDate    *string  `json:"credit_start_date,omitempty"`
	RecurringAmount    *float64 `json:"recurring_amount,omitempty"`
	RecurringDay       *int     `json:"recurring_day,omitempty"`
	RecurringStartDate *string  `json:"recurring_start_date,omitempty"`
}

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

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

type CreateRecurringPlanRequest struct {
	Effective string  `json:"effective"`
	Amount    float64 `json:"amount"`
	Day       int     `json:"day,omitempty"`
	UserID    *int64  `json:"user_id,omitempty"`
}

type UpdateRecurringPlanRequest struct {
	Effective *string  `json:"effective,omitempty"`
	Amount    *float64 `json:"amount,omitempty"`
	Day       *int     `json:"day,omitempty"`
}

type SavingsStats struct {
	MonthlyPayments       float64                `json:"monthly_payments"`
	MonthlyPaymentDetails []MonthlyPaymentDetail `json:"monthly_payment_details"`
	Overdues              []OverduePayment       `json:"overdues"`
	TotalBalance     float64         `json:"total_balance"`
	TotalDeposits    float64         `json:"total_deposits"`
	TotalWithdrawals float64         `json:"total_withdrawals"`
	CategoriesCount  int             `json:"categories_count"`
	ByCategory       []CategoryStats `json:"by_category"`
}

type CategoryStats struct {
	CategoryID   int64   `json:"category_id"`
	CategoryName string  `json:"category_name"`
	Balance      float64 `json:"balance"`
	IsDeposit    bool    `json:"is_deposit"`
	IsRecurring  bool    `json:"is_recurring"`
}

// MonthlyPaymentDetail represents a recurring payment detail
type MonthlyPaymentDetail struct {
	CategoryID   int64   `json:"category_id"`
	CategoryName string  `json:"category_name"`
	Amount       float64 `json:"amount"`
	Day          int     `json:"day"`
}

// OverduePayment represents an overdue recurring payment
type OverduePayment struct {
	CategoryID   int64   `json:"category_id"`
	CategoryName string  `json:"category_name"`
	UserID       int64   `json:"user_id"`
	UserName     string  `json:"user_name"`
	Amount       float64 `json:"amount"`
	DueDay       int     `json:"due_day"`
	DaysOverdue  int     `json:"days_overdue"`
	Month        string  `json:"month"`
}