package ui

import (
	"fmt"
	"strings"

	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"

	"git.warky.dev/wdevs/relspecgo/pkg/models"
)

// showSchemaList displays the schema management screen
func (se *SchemaEditor) showSchemaList() {
	flex := tview.NewFlex().SetDirection(tview.FlexRow)

	// Title
	title := tview.NewTextView().
		SetText("[::b]Manage Schemas").
		SetDynamicColors(true).
		SetTextAlign(tview.AlignCenter)

	// Create schemas table
	schemaTable := tview.NewTable().SetBorders(true).SetSelectable(true, false).SetFixed(1, 0)

	// Add header row with padding for full width
	headers := []string{"Name", "Sequence", "Total Tables", "Total Sequences", "Total Views", "Description"}
	headerWidths := []int{20, 15, 20, 20, 15} // Last column takes remaining space
	for i, header := range headers {
		padding := ""
		if i < len(headerWidths) {
			padding = strings.Repeat(" ", headerWidths[i]-len(header))
		}
		cell := tview.NewTableCell(header + padding).
			SetTextColor(tcell.ColorYellow).
			SetSelectable(false).
			SetAlign(tview.AlignLeft)
		schemaTable.SetCell(0, i, cell)
	}

	// Add existing schemas
	for row, schema := range se.db.Schemas {
		schema := schema // capture for closure

		// Name - pad to 20 chars
		nameStr := fmt.Sprintf("%-20s", schema.Name)
		nameCell := tview.NewTableCell(nameStr).SetSelectable(true)
		schemaTable.SetCell(row+1, 0, nameCell)

		// Sequence - pad to 15 chars
		seqStr := fmt.Sprintf("%-15s", fmt.Sprintf("%d", schema.Sequence))
		seqCell := tview.NewTableCell(seqStr).SetSelectable(true)
		schemaTable.SetCell(row+1, 1, seqCell)

		// Total Tables - pad to 20 chars
		tablesStr := fmt.Sprintf("%-20s", fmt.Sprintf("%d", len(schema.Tables)))
		tablesCell := tview.NewTableCell(tablesStr).SetSelectable(true)
		schemaTable.SetCell(row+1, 2, tablesCell)

		// Total Sequences - pad to 20 chars
		sequencesStr := fmt.Sprintf("%-20s", fmt.Sprintf("%d", len(schema.Sequences)))
		sequencesCell := tview.NewTableCell(sequencesStr).SetSelectable(true)
		schemaTable.SetCell(row+1, 3, sequencesCell)

		// Total Views - pad to 15 chars
		viewsStr := fmt.Sprintf("%-15s", fmt.Sprintf("%d", len(schema.Views)))
		viewsCell := tview.NewTableCell(viewsStr).SetSelectable(true)
		schemaTable.SetCell(row+1, 4, viewsCell)

		// Description - no padding, takes remaining space
		descCell := tview.NewTableCell(schema.Description).SetSelectable(true)
		schemaTable.SetCell(row+1, 5, descCell)
	}

	schemaTable.SetTitle(" Schemas ").SetBorder(true).SetTitleAlign(tview.AlignLeft)

	// Action buttons flex (define before input capture)
	btnFlex := tview.NewFlex()
	btnNewSchema := tview.NewButton("New Schema [n]").SetSelectedFunc(func() {
		se.showNewSchemaDialog()
	})
	btnBack := tview.NewButton("Back [b]").SetSelectedFunc(func() {
		se.pages.SwitchToPage("main")
		se.pages.RemovePage("schemas")
	})

	// Set up button input captures for Tab/Shift+Tab navigation
	btnNewSchema.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyBacktab {
			se.app.SetFocus(schemaTable)
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(btnBack)
			return nil
		}
		return event
	})

	btnBack.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyBacktab {
			se.app.SetFocus(btnNewSchema)
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(schemaTable)
			return nil
		}
		return event
	})

	btnFlex.AddItem(btnNewSchema, 0, 1, true).
		AddItem(btnBack, 0, 1, false)

	schemaTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.pages.SwitchToPage("main")
			se.pages.RemovePage("schemas")
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(btnNewSchema)
			return nil
		}
		if event.Key() == tcell.KeyEnter {
			row, _ := schemaTable.GetSelection()
			if row > 0 && row <= len(se.db.Schemas) { // Skip header row
				schemaIndex := row - 1
				se.showSchemaEditor(schemaIndex, se.db.Schemas[schemaIndex])
				return nil
			}
		}
		if event.Rune() == 'n' {
			se.showNewSchemaDialog()
			return nil
		}
		if event.Rune() == 'b' {
			se.pages.SwitchToPage("main")
			se.pages.RemovePage("schemas")
			return nil
		}
		return event
	})

	flex.AddItem(title, 1, 0, false).
		AddItem(schemaTable, 0, 1, true).
		AddItem(btnFlex, 1, 0, false)

	se.pages.AddPage("schemas", flex, true, true)
}

// showSchemaEditor shows the editor for a specific schema
func (se *SchemaEditor) showSchemaEditor(index int, schema *models.Schema) {
	flex := tview.NewFlex().SetDirection(tview.FlexRow)

	// Title
	title := tview.NewTextView().
		SetText(fmt.Sprintf("[::b]Schema: %s", schema.Name)).
		SetDynamicColors(true).
		SetTextAlign(tview.AlignCenter)

	// Schema info display
	info := tview.NewTextView().SetDynamicColors(true)
	info.SetText(fmt.Sprintf("Tables: %d | Description: %s",
		len(schema.Tables), schema.Description))

	// Table list
	tableList := tview.NewList().ShowSecondaryText(true)

	for i, table := range schema.Tables {
		tableIndex := i
		table := table
		colCount := len(table.Columns)
		tableList.AddItem(table.Name, fmt.Sprintf("%d columns", colCount), rune('0'+i), func() {
			se.showTableEditor(index, tableIndex, table)
		})
	}

	tableList.AddItem("[New Table]", "Add a new table to this schema", 'n', func() {
		se.showNewTableDialog(index)
	})

	tableList.AddItem("[Edit Schema Info]", "Edit schema properties", 'e', func() {
		se.showEditSchemaDialog(index)
	})

	tableList.AddItem("[Delete Schema]", "Delete this schema", 'd', func() {
		se.showDeleteSchemaConfirm(index)
	})

	tableList.SetBorder(true).SetTitle(" Tables ").SetTitleAlign(tview.AlignLeft)

	// Action buttons (define before input capture)
	btnFlex := tview.NewFlex()
	btnNewTable := tview.NewButton("New Table [n]").SetSelectedFunc(func() {
		se.showNewTableDialog(index)
	})
	btnBack := tview.NewButton("Back to Schemas [b]").SetSelectedFunc(func() {
		se.pages.RemovePage("schema-editor")
		se.pages.SwitchToPage("schemas")
	})

	// Set up button input captures for Tab/Shift+Tab navigation
	btnNewTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyBacktab {
			se.app.SetFocus(tableList)
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(btnBack)
			return nil
		}
		return event
	})

	btnBack.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyBacktab {
			se.app.SetFocus(btnNewTable)
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(tableList)
			return nil
		}
		return event
	})

	tableList.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.pages.RemovePage("schema-editor")
			se.pages.SwitchToPage("schemas")
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(btnNewTable)
			return nil
		}
		if event.Rune() == 'b' {
			se.pages.RemovePage("schema-editor")
			se.pages.SwitchToPage("schemas")
		}
		return event
	})

	btnFlex.AddItem(btnNewTable, 0, 1, true).
		AddItem(btnBack, 0, 1, false)

	flex.AddItem(title, 1, 0, false).
		AddItem(info, 2, 0, false).
		AddItem(tableList, 0, 1, true).
		AddItem(btnFlex, 1, 0, false)

	se.pages.AddPage("schema-editor", flex, true, true)
}

// showNewSchemaDialog shows dialog to create a new schema
func (se *SchemaEditor) showNewSchemaDialog() {
	form := tview.NewForm()

	schemaName := ""
	description := ""

	form.AddInputField("Schema Name", "", 40, nil, func(value string) {
		schemaName = value
	})

	form.AddInputField("Description", "", 40, nil, func(value string) {
		description = value
	})

	form.AddButton("Save", func() {
		if schemaName == "" {
			return
		}

		se.CreateSchema(schemaName, description)

		se.pages.RemovePage("new-schema")
		se.pages.RemovePage("schemas")
		se.showSchemaList()
	})

	form.AddButton("Back", func() {
		se.pages.RemovePage("new-schema")
		se.pages.RemovePage("schemas")
		se.showSchemaList()
	})

	form.SetBorder(true).SetTitle(" New Schema ").SetTitleAlign(tview.AlignLeft)
	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.showExitConfirmation("new-schema", "schemas")
			return nil
		}
		return event
	})

	se.pages.AddPage("new-schema", form, true, true)
}

// showEditSchemaDialog shows dialog to edit schema properties
func (se *SchemaEditor) showEditSchemaDialog(schemaIndex int) {
	schema := se.db.Schemas[schemaIndex]
	form := tview.NewForm()

	// Local variables to collect changes
	newName := schema.Name
	newOwner := schema.Owner
	newDescription := schema.Description

	form.AddInputField("Schema Name", schema.Name, 40, nil, func(value string) {
		newName = value
	})

	form.AddInputField("Owner", schema.Owner, 40, nil, func(value string) {
		newOwner = value
	})

	form.AddTextArea("Description", schema.Description, 40, 5, 0, func(value string) {
		newDescription = value
	})

	form.AddButton("Save", func() {
		// Apply changes using dataops
		se.UpdateSchema(schemaIndex, newName, newOwner, newDescription)

		schema := se.db.Schemas[schemaIndex]
		se.pages.RemovePage("edit-schema")
		se.pages.RemovePage("schema-editor")
		se.showSchemaEditor(schemaIndex, schema)
	})

	form.AddButton("Back", func() {
		// Discard changes - don't apply them
		schema := se.db.Schemas[schemaIndex]
		se.pages.RemovePage("edit-schema")
		se.pages.RemovePage("schema-editor")
		se.showSchemaEditor(schemaIndex, schema)
	})

	form.SetBorder(true).SetTitle(" Edit Schema ").SetTitleAlign(tview.AlignLeft)
	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.showExitConfirmation("edit-schema", "schema-editor")
			return nil
		}
		return event
	})

	se.pages.AddPage("edit-schema", form, true, true)
}