package ui

import (
	"fmt"
	"strings"

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

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

// showRelationshipList displays all relationships for a table
func (se *SchemaEditor) showRelationshipList(schemaIndex, tableIndex int) {
	table := se.GetTable(schemaIndex, tableIndex)
	if table == nil {
		return
	}

	flex := tview.NewFlex().SetDirection(tview.FlexRow)

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

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

	// Add header row
	headers := []string{"Name", "Type", "From Columns", "To Table", "To Columns", "Description"}
	headerWidths := []int{20, 15, 20, 20, 20}
	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)
		relTable.SetCell(0, i, cell)
	}

	// Get relationship names
	relNames := se.GetRelationshipNames(schemaIndex, tableIndex)
	for row, relName := range relNames {
		rel := table.Relationships[relName]

		// Name
		nameStr := fmt.Sprintf("%-20s", rel.Name)
		nameCell := tview.NewTableCell(nameStr).SetSelectable(true)
		relTable.SetCell(row+1, 0, nameCell)

		// Type
		typeStr := fmt.Sprintf("%-15s", string(rel.Type))
		typeCell := tview.NewTableCell(typeStr).SetSelectable(true)
		relTable.SetCell(row+1, 1, typeCell)

		// From Columns
		fromColsStr := strings.Join(rel.FromColumns, ", ")
		fromColsStr = fmt.Sprintf("%-20s", fromColsStr)
		fromColsCell := tview.NewTableCell(fromColsStr).SetSelectable(true)
		relTable.SetCell(row+1, 2, fromColsCell)

		// To Table
		toTableStr := rel.ToTable
		if rel.ToSchema != "" && rel.ToSchema != table.Schema {
			toTableStr = rel.ToSchema + "." + rel.ToTable
		}
		toTableStr = fmt.Sprintf("%-20s", toTableStr)
		toTableCell := tview.NewTableCell(toTableStr).SetSelectable(true)
		relTable.SetCell(row+1, 3, toTableCell)

		// To Columns
		toColsStr := strings.Join(rel.ToColumns, ", ")
		toColsStr = fmt.Sprintf("%-20s", toColsStr)
		toColsCell := tview.NewTableCell(toColsStr).SetSelectable(true)
		relTable.SetCell(row+1, 4, toColsCell)

		// Description
		descCell := tview.NewTableCell(rel.Description).SetSelectable(true)
		relTable.SetCell(row+1, 5, descCell)
	}

	relTable.SetTitle(" Relationships ").SetBorder(true).SetTitleAlign(tview.AlignLeft)

	// Action buttons
	btnFlex := tview.NewFlex()
	btnNew := tview.NewButton("New Relationship [n]").SetSelectedFunc(func() {
		se.showNewRelationshipDialog(schemaIndex, tableIndex)
	})
	btnEdit := tview.NewButton("Edit [e]").SetSelectedFunc(func() {
		row, _ := relTable.GetSelection()
		if row > 0 && row <= len(relNames) {
			relName := relNames[row-1]
			se.showEditRelationshipDialog(schemaIndex, tableIndex, relName)
		}
	})
	btnDelete := tview.NewButton("Delete [d]").SetSelectedFunc(func() {
		row, _ := relTable.GetSelection()
		if row > 0 && row <= len(relNames) {
			relName := relNames[row-1]
			se.showDeleteRelationshipConfirm(schemaIndex, tableIndex, relName)
		}
	})
	btnBack := tview.NewButton("Back [b]").SetSelectedFunc(func() {
		se.pages.RemovePage("relationships")
		se.pages.SwitchToPage("table-editor")
	})

	// Set up button navigation
	btnNew.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyBacktab {
			se.app.SetFocus(relTable)
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(btnEdit)
			return nil
		}
		return event
	})

	btnEdit.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyBacktab {
			se.app.SetFocus(btnNew)
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(btnDelete)
			return nil
		}
		return event
	})

	btnDelete.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyBacktab {
			se.app.SetFocus(btnEdit)
			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(btnDelete)
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(relTable)
			return nil
		}
		return event
	})

	btnFlex.AddItem(btnNew, 0, 1, true).
		AddItem(btnEdit, 0, 1, false).
		AddItem(btnDelete, 0, 1, false).
		AddItem(btnBack, 0, 1, false)

	relTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.pages.RemovePage("relationships")
			se.pages.SwitchToPage("table-editor")
			return nil
		}
		if event.Key() == tcell.KeyTab {
			se.app.SetFocus(btnNew)
			return nil
		}
		if event.Key() == tcell.KeyEnter {
			row, _ := relTable.GetSelection()
			if row > 0 && row <= len(relNames) {
				relName := relNames[row-1]
				se.showEditRelationshipDialog(schemaIndex, tableIndex, relName)
			}
			return nil
		}
		if event.Rune() == 'n' {
			se.showNewRelationshipDialog(schemaIndex, tableIndex)
			return nil
		}
		if event.Rune() == 'e' {
			row, _ := relTable.GetSelection()
			if row > 0 && row <= len(relNames) {
				relName := relNames[row-1]
				se.showEditRelationshipDialog(schemaIndex, tableIndex, relName)
			}
			return nil
		}
		if event.Rune() == 'd' {
			row, _ := relTable.GetSelection()
			if row > 0 && row <= len(relNames) {
				relName := relNames[row-1]
				se.showDeleteRelationshipConfirm(schemaIndex, tableIndex, relName)
			}
			return nil
		}
		if event.Rune() == 'b' {
			se.pages.RemovePage("relationships")
			se.pages.SwitchToPage("table-editor")
			return nil
		}
		return event
	})

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

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

// showNewRelationshipDialog shows dialog to create a new relationship
func (se *SchemaEditor) showNewRelationshipDialog(schemaIndex, tableIndex int) {
	table := se.GetTable(schemaIndex, tableIndex)
	if table == nil {
		return
	}

	form := tview.NewForm()

	// Collect all tables for dropdown
	var allTables []string
	var tableMap []struct{ schemaIdx, tableIdx int }
	for si, schema := range se.db.Schemas {
		for ti, t := range schema.Tables {
			tableName := t.Name
			if schema.Name != table.Schema {
				tableName = schema.Name + "." + t.Name
			}
			allTables = append(allTables, tableName)
			tableMap = append(tableMap, struct{ schemaIdx, tableIdx int }{si, ti})
		}
	}

	relName := ""
	relType := models.OneToMany
	fromColumns := ""
	toColumns := ""
	description := ""
	selectedTableIdx := 0

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

	form.AddDropDown("Type", []string{
		string(models.OneToOne),
		string(models.OneToMany),
		string(models.ManyToMany),
	}, 1, func(option string, optionIndex int) {
		relType = models.RelationType(option)
	})

	form.AddInputField("From Columns (comma-separated)", "", 40, nil, func(value string) {
		fromColumns = value
	})

	form.AddDropDown("To Table", allTables, 0, func(option string, optionIndex int) {
		selectedTableIdx = optionIndex
	})

	form.AddInputField("To Columns (comma-separated)", "", 40, nil, func(value string) {
		toColumns = value
	})

	form.AddInputField("Description", "", 60, nil, func(value string) {
		description = value
	})

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

		// Parse columns
		fromCols := strings.Split(fromColumns, ",")
		for i := range fromCols {
			fromCols[i] = strings.TrimSpace(fromCols[i])
		}

		toCols := strings.Split(toColumns, ",")
		for i := range toCols {
			toCols[i] = strings.TrimSpace(toCols[i])
		}

		// Get target table
		targetSchema := se.db.Schemas[tableMap[selectedTableIdx].schemaIdx]
		targetTable := targetSchema.Tables[tableMap[selectedTableIdx].tableIdx]

		rel := models.InitRelationship(relName, relType)
		rel.FromTable = table.Name
		rel.FromSchema = table.Schema
		rel.FromColumns = fromCols
		rel.ToTable = targetTable.Name
		rel.ToSchema = targetTable.Schema
		rel.ToColumns = toCols
		rel.Description = description

		se.CreateRelationship(schemaIndex, tableIndex, rel)

		se.pages.RemovePage("new-relationship")
		se.pages.RemovePage("relationships")
		se.showRelationshipList(schemaIndex, tableIndex)
	})

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

	form.SetBorder(true).SetTitle(" New Relationship ").SetTitleAlign(tview.AlignLeft)
	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.pages.RemovePage("new-relationship")
			return nil
		}
		return event
	})

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

// showEditRelationshipDialog shows dialog to edit a relationship
func (se *SchemaEditor) showEditRelationshipDialog(schemaIndex, tableIndex int, relName string) {
	table := se.GetTable(schemaIndex, tableIndex)
	if table == nil {
		return
	}

	rel := se.GetRelationship(schemaIndex, tableIndex, relName)
	if rel == nil {
		return
	}

	form := tview.NewForm()

	// Collect all tables for dropdown
	var allTables []string
	var tableMap []struct{ schemaIdx, tableIdx int }
	selectedTableIdx := 0
	for si, schema := range se.db.Schemas {
		for ti, t := range schema.Tables {
			tableName := t.Name
			if schema.Name != table.Schema {
				tableName = schema.Name + "." + t.Name
			}
			allTables = append(allTables, tableName)
			tableMap = append(tableMap, struct{ schemaIdx, tableIdx int }{si, ti})

			// Check if this is the current target table
			if t.Name == rel.ToTable && schema.Name == rel.ToSchema {
				selectedTableIdx = len(allTables) - 1
			}
		}
	}

	newName := rel.Name
	relType := rel.Type
	fromColumns := strings.Join(rel.FromColumns, ", ")
	toColumns := strings.Join(rel.ToColumns, ", ")
	description := rel.Description

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

	// Find initial type index
	typeIdx := 1 // OneToMany default
	typeOptions := []string{
		string(models.OneToOne),
		string(models.OneToMany),
		string(models.ManyToMany),
	}
	for i, opt := range typeOptions {
		if opt == string(rel.Type) {
			typeIdx = i
			break
		}
	}

	form.AddDropDown("Type", typeOptions, typeIdx, func(option string, optionIndex int) {
		relType = models.RelationType(option)
	})

	form.AddInputField("From Columns (comma-separated)", fromColumns, 40, nil, func(value string) {
		fromColumns = value
	})

	form.AddDropDown("To Table", allTables, selectedTableIdx, func(option string, optionIndex int) {
		selectedTableIdx = optionIndex
	})

	form.AddInputField("To Columns (comma-separated)", toColumns, 40, nil, func(value string) {
		toColumns = value
	})

	form.AddInputField("Description", rel.Description, 60, nil, func(value string) {
		description = value
	})

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

		// Parse columns
		fromCols := strings.Split(fromColumns, ",")
		for i := range fromCols {
			fromCols[i] = strings.TrimSpace(fromCols[i])
		}

		toCols := strings.Split(toColumns, ",")
		for i := range toCols {
			toCols[i] = strings.TrimSpace(toCols[i])
		}

		// Get target table
		targetSchema := se.db.Schemas[tableMap[selectedTableIdx].schemaIdx]
		targetTable := targetSchema.Tables[tableMap[selectedTableIdx].tableIdx]

		updatedRel := models.InitRelationship(newName, relType)
		updatedRel.FromTable = table.Name
		updatedRel.FromSchema = table.Schema
		updatedRel.FromColumns = fromCols
		updatedRel.ToTable = targetTable.Name
		updatedRel.ToSchema = targetTable.Schema
		updatedRel.ToColumns = toCols
		updatedRel.Description = description
		updatedRel.GUID = rel.GUID

		se.UpdateRelationship(schemaIndex, tableIndex, relName, updatedRel)

		se.pages.RemovePage("edit-relationship")
		se.pages.RemovePage("relationships")
		se.showRelationshipList(schemaIndex, tableIndex)
	})

	form.AddButton("Back", func() {
		se.pages.RemovePage("edit-relationship")
	})

	form.SetBorder(true).SetTitle(" Edit Relationship ").SetTitleAlign(tview.AlignLeft)
	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.pages.RemovePage("edit-relationship")
			return nil
		}
		return event
	})

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

// showDeleteRelationshipConfirm shows confirmation dialog for deleting a relationship
func (se *SchemaEditor) showDeleteRelationshipConfirm(schemaIndex, tableIndex int, relName string) {
	modal := tview.NewModal().
		SetText(fmt.Sprintf("Delete relationship '%s'? This action cannot be undone.", relName)).
		AddButtons([]string{"Cancel", "Delete"}).
		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
			if buttonLabel == "Delete" {
				se.DeleteRelationship(schemaIndex, tableIndex, relName)
				se.pages.RemovePage("delete-relationship-confirm")
				se.pages.RemovePage("relationships")
				se.showRelationshipList(schemaIndex, tableIndex)
			} else {
				se.pages.RemovePage("delete-relationship-confirm")
			}
		})

	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyEscape {
			se.pages.RemovePage("delete-relationship-confirm")
			return nil
		}
		return event
	})

	se.pages.AddAndSwitchToPage("delete-relationship-confirm", modal, true)
}