package handler

import (
	"fmt"
	"strings"

	"github.com/go-telegram/bot/models"

	"uptodownBot/internal/domain"
)

func mainKeyboard() models.InlineKeyboardMarkup {
	return models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{
				{Text: "Download", CallbackData: "download"},
				{Text: "Settings", CallbackData: "settings"},
			},
			{
				{Text: "History", CallbackData: "history"},
				{Text: "Help", CallbackData: "help"},
			},
		},
	}
}

func backKeyboard() models.InlineKeyboardMarkup {
	return models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{{Text: "Back to Menu", CallbackData: "back_menu"}},
		},
	}
}

func settingsBackKeyboard() models.InlineKeyboardMarkup {
	return models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{{Text: "Back to Settings", CallbackData: "back_settings"}},
		},
	}
}

// mediaTypeKeyboard builds the three-button row for media type selection + Cancel.
func mediaTypeKeyboard() models.InlineKeyboardMarkup {
	return models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{
				{Text: "Audio Only", CallbackData: "type_audio"},
				{Text: "Video Only", CallbackData: "type_video"},
				{Text: "Video+Audio", CallbackData: "type_both"},
			},
			{{Text: "Cancel", CallbackData: "cancel_dl"}},
		},
	}
}

// formatKeyboard builds a keyboard from a slice of format labels.
func formatKeyboard(prefix string, labels []string) models.InlineKeyboardMarkup {
	rows := [][]models.InlineKeyboardButton{}
	row := []models.InlineKeyboardButton{}
	for i, label := range labels {
		data := prefix + label
		row = append(row, models.InlineKeyboardButton{Text: label, CallbackData: data})
		if len(row) == 2 || i == len(labels)-1 {
			rows = append(rows, row)
			row = nil
		}
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back", CallbackData: "back_step"},
		{Text: "Cancel", CallbackData: "cancel_dl"},
	})
	return models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// languageKeyboard builds a keyboard from available languages.
func languageKeyboard(languages []string) models.InlineKeyboardMarkup {
	rows := [][]models.InlineKeyboardButton{}
	row := []models.InlineKeyboardButton{}
	for i, lang := range languages {
		data := "lang_" + lang
		row = append(row, models.InlineKeyboardButton{Text: lang, CallbackData: data})
		if len(row) == 2 || i == len(languages)-1 {
			rows = append(rows, row)
			row = nil
		}
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back", CallbackData: "back_step"},
		{Text: "Cancel", CallbackData: "cancel_dl"},
	})
	return models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// containerKeyboard builds keyboard for container format selection.
func containerKeyboard(containers []string) models.InlineKeyboardMarkup {
	rows := [][]models.InlineKeyboardButton{}
	row := []models.InlineKeyboardButton{}
	for i, c := range containers {
		data := "container_" + c
		row = append(row, models.InlineKeyboardButton{Text: strings.ToUpper(c), CallbackData: data})
		if len(row) == 3 || i == len(containers)-1 {
			rows = append(rows, row)
			row = nil
		}
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back", CallbackData: "back_step"},
		{Text: "Cancel", CallbackData: "cancel_dl"},
	})
	return models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// progressKeyboard builds the progress display with a dummy button and cancel.
func progressKeyboard(pct float64, speed, eta string) models.InlineKeyboardMarkup {
	progressText := fmt.Sprintf("%.1f%%", pct)
	if speed != "" {
		progressText += fmt.Sprintf(" | %s/s", speed)
	}
	if eta != "" {
		progressText += fmt.Sprintf(" | ETA %s", eta)
	}
	return models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{{Text: progressText, CallbackData: "noop"}},
			{{Text: "Cancel", CallbackData: "cancel_dl"}},
		},
	}
}

// buildToggleKeyboard creates an on/off picker for a boolean setting.
// Matches worktimeBot's pattern with "> " prefix for the current selection.
func buildToggleKeyboard(userID int64, setting, label string, st *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
	current := false
	switch setting {
	case "quality":
		current = st.DefaultQuality == "best"
	case "container":
		current = st.DefaultContainer == "mp4"
	}
	options := []struct {
		label string
		data  string
		value bool
	}{
		{"Enabled", setting + "_enable", true},
		{"Disabled", setting + "_disable", false},
	}
	rows := [][]models.InlineKeyboardButton{}
	for _, opt := range options {
		l := opt.label
		if opt.value == current {
			l = "> " + l
		}
		rows = append(rows, []models.InlineKeyboardButton{
			{Text: l, CallbackData: opt.data},
		})
	}
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Back to Settings", CallbackData: "back_settings"},
	})
	return label + ":", models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// playlistNavKeyboard builds the paginated navigation for playlist selection.
func playlistNavKeyboard(state *domain.PlaylistState, selectedCount int) models.InlineKeyboardMarkup {
	totalPages := (len(state.Entries) + state.PerPage - 1) / state.PerPage
	if totalPages < 1 {
		totalPages = 1
	}

	// Build entry rows (2 per row)
	rows := [][]models.InlineKeyboardButton{}
	start := state.Page * state.PerPage
	end := start + state.PerPage
	if end > len(state.Entries) {
		end = len(state.Entries)
	}

	for i := start; i < end; i += 2 {
		row := []models.InlineKeyboardButton{}
		// First entry
		e := state.Entries[i]
		prefix := "  "
		if state.Selected[e.ID] {
			prefix = "> "
		}
		// Truncate title for button
		title := e.Title
		if len(title) > 30 {
			title = title[:27] + "..."
		}
		row = append(row, models.InlineKeyboardButton{
			Text: prefix + title, CallbackData: "pl_entry_" + e.ID,
		})
		// Second entry if available
		if i+1 < end {
			e2 := state.Entries[i+1]
			prefix2 := "  "
			if state.Selected[e2.ID] {
				prefix2 = "> "
			}
			title2 := e2.Title
			if len(title2) > 30 {
				title2 = title2[:27] + "..."
			}
			row = append(row, models.InlineKeyboardButton{
				Text: prefix2 + title2, CallbackData: "pl_entry_" + e2.ID,
			})
		}
		rows = append(rows, row)
	}

	// Navigation row
	navRow := []models.InlineKeyboardButton{}
	navRow = append(navRow, models.InlineKeyboardButton{
		Text: "<", CallbackData: fmt.Sprintf("pl_page_%d", state.Page-1),
	})
	navRow = append(navRow, models.InlineKeyboardButton{
		Text: fmt.Sprintf("Page %d/%d", state.Page+1, totalPages), CallbackData: "noop",
	})
	navRow = append(navRow, models.InlineKeyboardButton{
		Text: ">", CallbackData: fmt.Sprintf("pl_page_%d", state.Page+1),
	})
	rows = append(rows, navRow)

	// Action row
	actionRow := []models.InlineKeyboardButton{
		{Text: "Select All", CallbackData: "pl_select_all"},
	}
	if selectedCount > 0 {
		actionRow = append(actionRow, models.InlineKeyboardButton{
			Text: fmt.Sprintf("Confirm (%d)", selectedCount), CallbackData: "pl_confirm",
		})
	}
	rows = append(rows, actionRow)

	// Cancel
	rows = append(rows, []models.InlineKeyboardButton{
		{Text: "Cancel", CallbackData: "cancel_dl"},
	})

	return models.InlineKeyboardMarkup{InlineKeyboard: rows}
}

// deleteConfirmKeyboard builds the confirmation prompt for account deletion.
func deleteConfirmKeyboard(userID int64) models.InlineKeyboardMarkup {
	return models.InlineKeyboardMarkup{
		InlineKeyboard: [][]models.InlineKeyboardButton{
			{
				{Text: "Yes, delete everything", CallbackData: fmt.Sprintf("delaccount_%d", userID)},
				{Text: "Cancel", CallbackData: "back_settings"},
			},
		},
	}
}