package model

import (
	"database/sql"
	"strings"
	"time"
)

type Task struct {
	ID                 int64          `db:"id" json:"id"`
	UserID             int64          `db:"user_id" json:"user_id"`
	Title              string         `db:"title" json:"title"`
	Description        string         `db:"description" json:"description"`
	Icon               string         `db:"icon" json:"icon"`
	Color              string         `db:"color" json:"color"`
	DueDate            sql.NullTime   `db:"due_date" json:"-"`
	DueDateStr         *string        `db:"-" json:"due_date"`
	Priority           int            `db:"priority" json:"priority"`
	ReminderTime       sql.NullString `db:"reminder_time" json:"-"`
	ReminderTimeStr    *string        `db:"-" json:"reminder_time"`
	CompletedAt        sql.NullTime   `db:"completed_at" json:"-"`
	Completed          bool           `db:"-" json:"completed"`
	// Recurring task fields
	IsRecurring        bool           `db:"is_recurring" json:"is_recurring"`
	RecurrenceType     sql.NullString `db:"recurrence_type" json:"-"`
	RecurrenceTypeStr  *string        `db:"-" json:"recurrence_type"`
	RecurrenceInterval int            `db:"recurrence_interval" json:"recurrence_interval"`
	RecurrenceEndDate  sql.NullTime   `db:"recurrence_end_date" json:"-"`
	RecurrenceEndStr   *string        `db:"-" json:"recurrence_end_date"`
	ParentTaskID       sql.NullInt64  `db:"parent_task_id" json:"-"`
	ParentTaskIDPtr    *int64         `db:"-" json:"parent_task_id"`
	CreatedAt          time.Time      `db:"created_at" json:"created_at"`
	UpdatedAt          time.Time      `db:"updated_at" json:"updated_at"`
}

func (t *Task) ProcessForJSON() {
	if t.DueDate.Valid {
		s := t.DueDate.Time.Format("2006-01-02")
		t.DueDateStr = &s
	}
	if t.ReminderTime.Valid && t.ReminderTime.String != "" {
		timeStr := t.ReminderTime.String
		// Handle formats like "0000-01-01T19:00:00Z" or "19:00:00"
		if strings.Contains(timeStr, "T") {
			parsed, err := time.Parse(time.RFC3339, timeStr)
			if err == nil {
				formatted := parsed.Format("15:04")
				t.ReminderTimeStr = &formatted
				return
			}
		}
		// Handle "19:00:00" format
		if len(timeStr) >= 5 {
			formatted := timeStr[:5]
			t.ReminderTimeStr = &formatted
		}
	}
	t.Completed = t.CompletedAt.Valid
	
	// Process recurring fields
	if t.RecurrenceType.Valid {
		t.RecurrenceTypeStr = &t.RecurrenceType.String
	}
	if t.RecurrenceEndDate.Valid {
		s := t.RecurrenceEndDate.Time.Format("2006-01-02")
		t.RecurrenceEndStr = &s
	}
	if t.ParentTaskID.Valid {
		t.ParentTaskIDPtr = &t.ParentTaskID.Int64
	}
}

type CreateTaskRequest struct {
	Title              string  `json:"title"`
	Description        string  `json:"description,omitempty"`
	Icon               string  `json:"icon,omitempty"`
	Color              string  `json:"color,omitempty"`
	DueDate            *string `json:"due_date,omitempty"`
	Priority           int     `json:"priority,omitempty"`
	ReminderTime       *string `json:"reminder_time,omitempty"`
	// Recurring fields
	IsRecurring        bool    `json:"is_recurring,omitempty"`
	RecurrenceType     *string `json:"recurrence_type,omitempty"`
	RecurrenceInterval int     `json:"recurrence_interval,omitempty"`
	RecurrenceEndDate  *string `json:"recurrence_end_date,omitempty"`
}

type UpdateTaskRequest struct {
	Title              *string `json:"title,omitempty"`
	Description        *string `json:"description,omitempty"`
	Icon               *string `json:"icon,omitempty"`
	Color              *string `json:"color,omitempty"`
	DueDate            *string `json:"due_date,omitempty"`
	Priority           *int    `json:"priority,omitempty"`
	ReminderTime       *string `json:"reminder_time,omitempty"`
	// Recurring fields
	IsRecurring        *bool   `json:"is_recurring,omitempty"`
	RecurrenceType     *string `json:"recurrence_type,omitempty"`
	RecurrenceInterval *int    `json:"recurrence_interval,omitempty"`
	RecurrenceEndDate  *string `json:"recurrence_end_date,omitempty"`
}