package app

import (
	"fmt"

	ops "fn-registry/fn_operations"
	"fn-registry/registry"
	"pipeline-launcher/config"
	"pipeline-launcher/views"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
	"github.com/lucasdataproyects/devfactory/tui"
)

// View identifies which tab is active.
type View int

const (
	ViewPipelines View = iota
	ViewHistory
)

var tabNames = []string{"Pipelines", "History"}

// Model is the top-level TUI model with two tabs.
type Model struct {
	tui.BaseModel
	activeTab  int
	pipelines  views.PipelinesModel
	history    views.HistoryModel
	ready      bool
	registryDB *registry.DB
	opsDB      *ops.DB
}

// New creates the Model, opening both databases.
func New(cfg config.Config) (Model, error) {
	regDB, err := registry.Open(cfg.RegistryDB)
	if err != nil {
		return Model{}, fmt.Errorf("opening registry: %w", err)
	}

	opsDB, err := ops.Open(cfg.OperationsDB)
	if err != nil {
		regDB.Close()
		return Model{}, fmt.Errorf("opening operations: %w", err)
	}

	// Build pipeline name map for history view
	fns, _ := regDB.SearchFunctions("", registry.KindPipeline, "", "", "")
	names := make(map[string]string, len(fns))
	for _, f := range fns {
		names[f.ID] = f.Name
	}

	styles := tui.DarkStyles()

	return Model{
		BaseModel:  tui.NewBaseModel().WithStyles(styles),
		pipelines:  views.NewPipelinesModel(styles, regDB, opsDB, cfg.RegistryRoot),
		history:    views.NewHistoryModel(styles, opsDB, names),
		registryDB: regDB,
		opsDB:      opsDB,
	}, nil
}

// Close closes both database connections.
func (m Model) Close() {
	if m.registryDB != nil {
		m.registryDB.Close()
	}
	if m.opsDB != nil {
		m.opsDB.Close()
	}
}

func (m Model) Init() tea.Cmd {
	return m.pipelines.Init()
}

func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case views.KeyQuit:
			return m, tea.Quit
		case "q":
			updated, atBase := m.handleBack()
			if atBase {
				return updated, tea.Quit
			}
			return updated, nil
		case views.KeyEsc, views.KeyBack:
			updated, atBase := m.handleBack()
			if atBase {
				return updated, nil
			}
			return updated, nil
		case views.KeyTab:
			m.activeTab = (m.activeTab + 1) % len(tabNames)
			return m, m.initActiveView()
		case "shift+tab":
			m.activeTab = (m.activeTab - 1 + len(tabNames)) % len(tabNames)
			return m, m.initActiveView()
		}
	case tea.WindowSizeMsg:
		m.HandleWindowSize(msg)
		m.ready = true
	}

	var cmd tea.Cmd
	switch View(m.activeTab) {
	case ViewPipelines:
		m.pipelines, cmd = m.pipelines.Update(msg)
	case ViewHistory:
		m.history, cmd = m.history.Update(msg)
	}
	return m, cmd
}

func (m Model) View() string {
	if !m.ready {
		return "Loading..."
	}

	tabs := m.renderTabs()

	var content string
	switch View(m.activeTab) {
	case ViewPipelines:
		content = m.pipelines.View()
	case ViewHistory:
		content = m.history.View()
	}

	status := m.Styles.StatusBar.Render(" Tab: switch view │ Ctrl+C: quit │ Enter: action │ r: refresh")

	return lipgloss.JoinVertical(lipgloss.Left,
		tabs,
		"",
		content,
		"",
		status,
	)
}

func (m Model) renderTabs() string {
	var tabs []string
	for i, name := range tabNames {
		if i == m.activeTab {
			tabs = append(tabs, m.Styles.Selected.Render(" "+name+" "))
		} else {
			tabs = append(tabs, m.Styles.Muted.Render(" "+name+" "))
		}
	}
	row := lipgloss.JoinHorizontal(lipgloss.Top, tabs...)
	return m.Styles.Header.Render("Pipeline Launcher") + "  " + row
}

func (m Model) handleBack() (Model, bool) {
	switch View(m.activeTab) {
	case ViewPipelines:
		atBase := m.pipelines.HandleBack()
		return m, atBase
	case ViewHistory:
		atBase := m.history.HandleBack()
		return m, atBase
	}
	return m, true
}

func (m Model) initActiveView() tea.Cmd {
	switch View(m.activeTab) {
	case ViewPipelines:
		return m.pipelines.Init()
	case ViewHistory:
		return m.history.Init()
	}
	return nil
}