package tui

import (
	"fmt"
	"strconv"

	"git.tjp.lol/punchcard/internal/queries"

	"github.com/charmbracelet/lipgloss/v2"
)

type ClientsProjectsModel struct {
	clients         []queries.Client
	projects        map[int64][]queries.Project
	selectedClient  int
	selectedProject *int
	showArchived    bool
}

// NewClientsProjectsModel creates a new clients/projects model
func NewClientsProjectsModel() ClientsProjectsModel {
	return ClientsProjectsModel{}
}

// visibleClients returns the list of clients that should be displayed
func (m ClientsProjectsModel) visibleClients() []queries.Client {
	if m.showArchived {
		return m.clients
	}

	visible := make([]queries.Client, 0, len(m.clients))
	for _, client := range m.clients {
		if client.Archived == 0 {
			visible = append(visible, client)
		}
	}
	return visible
}

// visibleProjects returns the list of projects for a client that should be displayed
func (m ClientsProjectsModel) visibleProjects(clientID int64) []queries.Project {
	allProjects := m.projects[clientID]
	if m.showArchived {
		return allProjects
	}

	visible := make([]queries.Project, 0, len(allProjects))
	for _, project := range allProjects {
		if project.Archived == 0 {
			visible = append(visible, project)
		}
	}
	return visible
}

// View renders the clients/projects box
func (m ClientsProjectsModel) View(width, height int, isSelected bool) string {
	var content string

	visibleClients := m.visibleClients()
	if len(visibleClients) == 0 {
		if len(m.clients) == 0 {
			content = inactiveTimerStyle.Render("No clients found\n\nUse 'punch add client' to\nadd your first client.")
		} else {
			content = inactiveTimerStyle.Render("All clients archived\n\nPress '.' to show archived")
		}
	} else {
		content = m.renderClientsAndProjects()
	}

	// Apply box styling
	style := unselectedBoxStyle
	if isSelected {
		style = selectedBoxStyle
	}

	title := titleStyle.Render("👥 Clients & Projects")

	return style.Width(width).Height(height).Render(
		fmt.Sprintf("%s\n\n%s", title, content),
	)
}

// renderClientsAndProjects renders the clients and their projects
func (m ClientsProjectsModel) renderClientsAndProjects() string {
	var content string
	visibleClients := m.visibleClients()

	for i, client := range visibleClients {
		if i > 0 {
			content += "\n"
		}

		// Build client name and rate
		clientText := client.Name
		if client.BillableRate.Valid {
			rateInDollars := float64(client.BillableRate.Int64) / 100.0
			clientText += fmt.Sprintf(" ($%.2f/hr)", rateInDollars)
		}

		// Style for client text
		clientStyle := lipgloss.NewStyle().Bold(true)
		if m.selectedClient == i && m.selectedProject == nil {
			clientStyle = clientStyle.Background(lipgloss.Color("62")).Foreground(lipgloss.Color("230"))
		} else if client.Archived != 0 {
			// Gray out archived clients
			clientStyle = clientStyle.Foreground(lipgloss.Color("246"))
		}

		content += "• " + clientStyle.Render(clientText) + "\n"

		visibleProjects := m.visibleProjects(client.ID)
		if len(visibleProjects) == 0 {
			content += "  └── (no projects)\n"
		} else {
			for j, project := range visibleProjects {
				prefix := "├──"
				if j == len(visibleProjects)-1 {
					prefix = "└──"
				}

				// Build project name and rate
				projectText := project.Name
				if project.BillableRate.Valid {
					rateInDollars := float64(project.BillableRate.Int64) / 100.0
					projectText += fmt.Sprintf(" ($%.2f/hr)", rateInDollars)
				}

				// Style for project text
				projectStyle := lipgloss.NewStyle()
				if m.selectedClient == i && m.selectedProject != nil && *m.selectedProject == j {
					projectStyle = projectStyle.Background(lipgloss.Color("62")).Foreground(lipgloss.Color("230"))
				} else if project.Archived != 0 {
					// Gray out archived projects
					projectStyle = projectStyle.Foreground(lipgloss.Color("246"))
				}

				content += fmt.Sprintf("  %s ", prefix) + projectStyle.Render(projectText) + "\n"
			}
		}
	}

	return content
}

func (m *ClientsProjectsModel) changeSelection(forward bool) {
	if forward {
		m.changeSelectionForward()
	} else {
		m.changeSelectionBackward()
	}
}

func (m *ClientsProjectsModel) changeSelectionForward() {
	visibleClients := m.visibleClients()
	if len(visibleClients) == 0 {
		return
	}

	selectedClient := visibleClients[m.selectedClient]
	visibleProjects := m.visibleProjects(selectedClient.ID)

	if m.selectedProject == nil {
		// starting with a client selected
		if len(visibleProjects) > 0 {
			// can jump into the first project
			zero := 0
			m.selectedProject = &zero
			return
		}

		// there is no next client - at the bottom, no-op
		if m.selectedClient == len(visibleClients)-1 {
			return
		}

		// jump to next client
		m.selectedClient++
		return
	}

	if *m.selectedProject == len(visibleProjects)-1 {
		// at last project

		if m.selectedClient == len(visibleClients)-1 {
			// also at last client - at the bottom, no-op
			return
		}

		// jump to next client, no project
		m.selectedClient++
		m.selectedProject = nil
		return
	}

	// jump to next project
	*m.selectedProject++
}

func (m *ClientsProjectsModel) changeSelectionBackward() {
	visibleClients := m.visibleClients()
	if len(visibleClients) == 0 {
		return
	}

	selectedClient := visibleClients[m.selectedClient]

	if m.selectedProject == nil {
		// starting with a client selected
		if m.selectedClient == 0 {
			// at first client - at the start, no-op
			return
		}

		m.selectedClient--
		selectedClient = visibleClients[m.selectedClient]
		visibleProjects := m.visibleProjects(selectedClient.ID)

		if len(visibleProjects) > 0 {
			// previous client has projects, jump to last one
			i := len(visibleProjects) - 1
			m.selectedProject = &i
		}

		// otherwise selectedProject is already nil
		return
	}

	if *m.selectedProject == 0 {
		// selected first project - jump up to client
		m.selectedProject = nil
		return
	}

	// otherwise, jump to previous project in same client
	*m.selectedProject--
}

func (m ClientsProjectsModel) selection() (string, string, string, *float64) {
	visibleClients := m.visibleClients()
	if len(visibleClients) == 0 {
		return "", "", "", nil
	}

	client := visibleClients[m.selectedClient]
	clientID := strconv.FormatInt(client.ID, 10)

	projectID := ""
	if m.selectedProject != nil {
		visibleProjects := m.visibleProjects(client.ID)
		project := visibleProjects[*m.selectedProject]
		projectID = strconv.FormatInt(project.ID, 10)
	}

	return clientID, projectID, "", nil
}

// resetSelection clamps the selection to valid bounds after visibility changes
func (m *ClientsProjectsModel) resetSelection() {
	visibleClients := m.visibleClients()
	if len(visibleClients) == 0 {
		m.selectedClient = 0
		m.selectedProject = nil
		return
	}

	// Clamp client selection
	if m.selectedClient >= len(visibleClients) {
		m.selectedClient = len(visibleClients) - 1
	}

	// Clamp project selection
	if m.selectedProject != nil {
		client := visibleClients[m.selectedClient]
		visibleProjects := m.visibleProjects(client.ID)
		if len(visibleProjects) == 0 {
			m.selectedProject = nil
		} else if *m.selectedProject >= len(visibleProjects) {
			i := len(visibleProjects) - 1
			m.selectedProject = &i
		}
	}
}

// getSelectedIDs returns the currently selected client ID and optional project ID
func (m ClientsProjectsModel) getSelectedIDs() (clientID int64, projectID *int64) {
	visibleClients := m.visibleClients()
	if len(visibleClients) == 0 {
		return 0, nil
	}
	if m.selectedClient >= len(visibleClients) {
		return 0, nil
	}

	client := visibleClients[m.selectedClient]
	clientID = client.ID

	if m.selectedProject != nil {
		visibleProjects := m.visibleProjects(client.ID)
		if *m.selectedProject >= len(visibleProjects) {
			return clientID, nil
		}
		project := visibleProjects[*m.selectedProject]
		projectID = &project.ID
	}

	return clientID, projectID
}

// restoreSelection tries to restore selection to the given IDs, or resets to top if not found
func (m *ClientsProjectsModel) restoreSelection(clientID int64, projectID *int64) {
	visibleClients := m.visibleClients()
	if len(visibleClients) == 0 {
		m.selectedClient = 0
		m.selectedProject = nil
		return
	}

	// Try to find the client
	clientFound := false
	for i, client := range visibleClients {
		if client.ID == clientID {
			m.selectedClient = i
			clientFound = true

			// Try to find the project if one was selected
			if projectID != nil {
				visibleProjects := m.visibleProjects(client.ID)
				for j, project := range visibleProjects {
					if project.ID == *projectID {
						m.selectedProject = &j
						return
					}
				}
				// Project not found, select client only
				m.selectedProject = nil
				return
			}

			// No project was selected, just client
			m.selectedProject = nil
			return
		}
	}

	// Client not found, reset to top
	if !clientFound {
		m.selectedClient = 0
		m.selectedProject = nil
	}
}