package tui

import (
	"context"
	"time"

	"punchcard/internal/queries"
)

// BoxType represents the different boxes that can be selected
type BoxType int

const (
	TimerBox BoxType = iota
	ClientsProjectsBox
	HistoryBox
)

func (b BoxType) String() string {
	switch b {
	case TimerBox:
		return "Timer"
	case ClientsProjectsBox:
		return "Clients & Projects"
	case HistoryBox:
		return "History"
	default:
		return "Unknown"
	}
}

// AppModel is the main model for the TUI application
type AppModel struct {
	ctx                context.Context
	queries            *queries.Queries
	selectedBox        BoxType
	timerBoxModel      TimerBoxModel
	clientsProjectsModel ClientsProjectsModel
	historyBoxModel    HistoryBoxModel
	width              int
	height             int
	// Cached data to avoid DB queries in View()
	stats              TimeStats
	runningTimerStart  *time.Time // UTC timestamp when timer started, nil if not active
	
	// Modal state
	showModal          bool
	modalType          ModalType
	textInputModel     TextInputModel
}

// ModalType represents different types of modals
type ModalType int

const (
	ModalDescribeTimer ModalType = iota
)

// TextInputModel represents a text input modal
type TextInputModel struct {
	prompt      string
	value       string
	placeholder string
	cursorPos   int
}

// TimerInfo holds information about the current timer state
type TimerInfo struct {
	IsActive     bool
	Duration     time.Duration
	StartTime    time.Time
	ClientName   string
	ProjectName  string
	Description  string
	BillableRate *float64
}

// TimeStats holds time statistics for display
type TimeStats struct {
	TodayTotal time.Duration
	WeekTotal  time.Duration
}

// TickMsg is sent every second to update the timer
type TickMsg time.Time

// KeyBinding represents the available key bindings for a view
type KeyBinding struct {
	Key         string
	Description string
}

// HistoryViewLevel represents the level of detail in history view
type HistoryViewLevel int

const (
	HistoryLevelSummary HistoryViewLevel = iota // Level 1: Date/project summaries
	HistoryLevelDetails                         // Level 2: Individual entries
)

// Box models for the three main components
type TimerBoxModel struct {
	timerInfo TimerInfo
}

type ClientsProjectsModel struct {
	clients         []queries.Client
	projects        []queries.ListAllProjectsRow
	selectedIndex   int // Index of selected row (client or project)
	selectedIsClient bool // True if selected row is a client, false if project
}

type HistoryBoxModel struct {
	entries         []queries.TimeEntry
	clients         []queries.Client // For looking up client names
	projects        []queries.ListAllProjectsRow // For looking up project names
	viewLevel       HistoryViewLevel
	selectedIndex   int  // Index of selected row
	// Cached running timer data to avoid recalculating in View()
	runningTimerStart *time.Time // UTC timestamp when timer started, nil if not active
	
	// Summary view data (level 1)
	summaryItems []HistorySummaryItem
	
	// Details view data (level 2)
	detailsEntries []queries.TimeEntry
	selectedSummaryItem *HistorySummaryItem // Which summary item we drilled down from
}

// HistorySummaryItem represents a date + client/project combination with total duration
type HistorySummaryItem struct {
	Date        time.Time
	ClientID    int64
	ClientName  string
	ProjectID   *int64  // nil if no project
	ProjectName *string // nil if no project
	TotalDuration time.Duration
	EntryCount    int
}

// HistoryDisplayItem represents an item in the history view (either date header or summary/detail item)
type HistoryDisplayItem struct {
	Type        HistoryDisplayItemType
	DateHeader  *string               // Set if Type is DateHeader
	Summary     *HistorySummaryItem   // Set if Type is Summary
	Entry       *queries.TimeEntry    // Set if Type is Entry
	IsSelectable bool
}

type HistoryDisplayItemType int

const (
	HistoryItemDateHeader HistoryDisplayItemType = iota
	HistoryItemSummary
	HistoryItemEntry
)

// ProjectsDisplayItem represents an item in the projects display order (either client or project)
type ProjectsDisplayItem struct {
	IsClient     bool
	ClientIndex  int // Index in m.clients
	ProjectIndex int // Index in m.projects, only used when IsClient=false
	Client       *queries.Client
	Project      *queries.ListAllProjectsRow
}