package models

import (
	"time"

	"task-dashboard/internal/config"
)

type AtomSource string

const (
	SourceTrello      AtomSource = "trello"
	SourceTodoist     AtomSource = "todoist"
	SourceMeal        AtomSource = "plantoeat"
	SourceGTasks      AtomSource = "gtasks"
	SourceClaudomator AtomSource = "claudomator"
)

type AtomType string

const (
	TypeTask AtomType = "task"
	TypeMeal AtomType = "meal"
)

// Atom represents a unified unit of work or information
type Atom struct {
	ID          string
	Title       string
	Description string
	Source      AtomSource
	Type        AtomType

	// Metadata
	URL       string
	DueDate   *time.Time
	CreatedAt time.Time

	Priority int // Normalized: 1 (Low) to 4 (Urgent)

	// UI Helpers (to be populated by mappers)
	SourceIcon  string // e.g., "trello-icon.svg" or emoji
	ColorClass  string // e.g., "border-blue-500"
	IsOverdue   bool   // True if due date is before today
	IsFuture    bool   // True if due date is after today
	HasSetTime  bool   // True if due time is not midnight (has specific time)
	IsRecurring bool   // True if this is a recurring task

	// Original Data (for write operations)
	Raw interface{}
}

// ComputeUIFields calculates IsOverdue, IsFuture, and HasSetTime based on DueDate
func (a *Atom) ComputeUIFields() {
	if a.DueDate == nil {
		return
	}

	tz := config.GetDisplayTimezone()
	now := config.Now()
	today := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, tz)

	// Check if overdue (due date is before today)
	dueInTZ := a.DueDate.In(tz)
	dueDay := time.Date(dueInTZ.Year(), dueInTZ.Month(), dueInTZ.Day(), 0, 0, 0, 0, tz)
	a.IsOverdue = dueDay.Before(today)

	// Check if future (due date is 7+ days out — collapse in tasks tab)
	sevenDaysOut := today.AddDate(0, 0, 7)
	a.IsFuture = !dueDay.Before(sevenDaysOut)

	// Check if has set time (not midnight)
	a.HasSetTime = dueInTZ.Hour() != 0 || dueInTZ.Minute() != 0
}

// TaskToAtom converts a Todoist Task to an Atom
func TaskToAtom(t Task) Atom {
	// Todoist priority: 1 (normal) to 4 (urgent)
	// Keep as-is since it already matches our 1-4 scale
	priority := t.Priority
	if priority < 1 {
		priority = 1
	}
	if priority > 4 {
		priority = 4
	}

	return Atom{
		ID:          t.ID,
		Title:       t.Content,
		Description: t.Description,
		Source:      SourceTodoist,
		Type:        TypeTask,
		URL:         t.URL,
		DueDate:     t.DueDate,
		CreatedAt:   t.CreatedAt,
		Priority:    priority,
		SourceIcon:  "🔴", // Red circle for Todoist
		ColorClass:  "border-red-500",
		IsRecurring: t.IsRecurring,
		Raw:         t,
	}
}

// CardToAtom converts a Trello Card to an Atom
func CardToAtom(c Card) Atom {
	// Trello doesn't have explicit priority, default to medium (2)
	// Can be enhanced later with label-based priority detection
	priority := 2

	return Atom{
		ID:          c.ID,
		Title:       c.Name,
		Description: c.ListName, // Use list name as description
		Source:      SourceTrello,
		Type:        TypeTask,
		URL:         c.URL,
		DueDate:     c.DueDate,
		CreatedAt:   time.Time{}, // Trello ID contains timestamp, can be parsed later
		Priority:    priority,
		SourceIcon:  "📋", // Clipboard emoji for boards
		ColorClass:  "border-blue-500",
		Raw:         c,
	}
}

// StoryToAtom converts a ClaudomatorStory to an Atom
func StoryToAtom(s ClaudomatorStory) Atom {
	return Atom{
		ID:          s.ID,
		Title:       s.Title,
		Description: s.Description + " [" + s.ProjectID + "]",
		Source:      SourceClaudomator,
		Type:        TypeTask,
		Priority:    3,
		SourceIcon:  "🤖",
		ColorClass:  "border-purple-500",
		CreatedAt:   s.CreatedAt,
		Raw:         s,
	}
}

// GoogleTaskToAtom converts a Google Task to an Atom
func GoogleTaskToAtom(t GoogleTask) Atom {
	// Google Tasks don't have explicit priority, default to medium (2)
	priority := 2

	return Atom{
		ID:          t.ID,
		Title:       t.Title,
		Description: t.Notes,
		Source:      SourceGTasks,
		Type:        TypeTask,
		URL:         t.URL,
		DueDate:     t.DueDate,
		CreatedAt:   t.UpdatedAt,
		Priority:    priority,
		SourceIcon:  "🔵", // Blue circle for Google Tasks
		ColorClass:  "border-blue-400",
		Raw:         t,
	}
}