package renderer

import (
	"fmt"

	"github.com/fatih/color"
	"github.com/olekukonko/tablewriter/tw"
)

// defaultBlueprint returns a default Rendition for ASCII table rendering with borders and light symbols.
func defaultBlueprint() tw.Rendition {
	return tw.Rendition{
		Borders: tw.Border{
			Left:   tw.On,
			Right:  tw.On,
			Top:    tw.On,
			Bottom: tw.On,
		},
		Settings: tw.Settings{
			Separators: tw.Separators{
				ShowHeader:     tw.On,
				ShowFooter:     tw.On,
				BetweenRows:    tw.Off,
				BetweenColumns: tw.On,
			},
			Lines: tw.Lines{
				ShowTop:        tw.On,
				ShowBottom:     tw.On,
				ShowHeaderLine: tw.On,
				ShowFooterLine: tw.On,
			},
			CompactMode: tw.Off,
			// Cushion:     tw.On,
		},
		Symbols:   tw.NewSymbols(tw.StyleLight),
		Streaming: true,
	}
}

// defaultColorized returns a default ColorizedConfig optimized for dark terminal backgrounds with colored headers, rows, and borders.
func defaultColorized() ColorizedConfig {
	return ColorizedConfig{
		Borders: tw.Border{Left: tw.On, Right: tw.On, Top: tw.On, Bottom: tw.On},
		Settings: tw.Settings{
			Separators: tw.Separators{
				ShowHeader:     tw.On,
				ShowFooter:     tw.On,
				BetweenRows:    tw.Off,
				BetweenColumns: tw.On,
			},
			Lines: tw.Lines{
				ShowTop:        tw.On,
				ShowBottom:     tw.On,
				ShowHeaderLine: tw.On,
				ShowFooterLine: tw.On,
			},

			CompactMode: tw.Off,
		},
		Header: Tint{
			FG: Colors{color.FgWhite, color.Bold},
			BG: Colors{color.BgBlack},
		},
		Column: Tint{
			FG: Colors{color.FgCyan},
			BG: Colors{color.BgBlack},
		},
		Footer: Tint{
			FG: Colors{color.FgYellow},
			BG: Colors{color.BgBlack},
		},
		Border: Tint{
			FG: Colors{color.FgWhite},
			BG: Colors{color.BgBlack},
		},
		Separator: Tint{
			FG: Colors{color.FgWhite},
			BG: Colors{color.BgBlack},
		},
		Symbols: tw.NewSymbols(tw.StyleLight),
	}
}

// defaultOceanRendererConfig returns a base tw.Rendition for the Ocean renderer.
func defaultOceanRendererConfig() tw.Rendition {
	return tw.Rendition{
		Borders: tw.Border{
			Left: tw.On, Right: tw.On, Top: tw.On, Bottom: tw.On,
		},
		Settings: tw.Settings{
			Separators: tw.Separators{
				ShowHeader:     tw.On,
				ShowFooter:     tw.Off,
				BetweenRows:    tw.Off,
				BetweenColumns: tw.On,
			},
			Lines: tw.Lines{
				ShowTop:        tw.On,
				ShowBottom:     tw.On,
				ShowHeaderLine: tw.On,
				ShowFooterLine: tw.Off,
			},

			CompactMode: tw.Off,
		},
		Symbols:   tw.NewSymbols(tw.StyleDefault),
		Streaming: true,
	}
}

// getHTMLStyle remains the same
func getHTMLStyle(align tw.Align) string {
	styleContent := tw.Empty
	switch align {
	case tw.AlignRight:
		styleContent = "text-align: right;"
	case tw.AlignCenter:
		styleContent = "text-align: center;"
	case tw.AlignLeft:
		styleContent = "text-align: left;"
	}
	if styleContent != tw.Empty {
		return fmt.Sprintf(` style="%s"`, styleContent)
	}
	return tw.Empty
}

// mergeLines combines default and override line settings, preserving defaults for unset (zero) overrides.
func mergeLines(defaults, overrides tw.Lines) tw.Lines {
	if overrides.ShowTop != 0 {
		defaults.ShowTop = overrides.ShowTop
	}
	if overrides.ShowBottom != 0 {
		defaults.ShowBottom = overrides.ShowBottom
	}
	if overrides.ShowHeaderLine != 0 {
		defaults.ShowHeaderLine = overrides.ShowHeaderLine
	}
	if overrides.ShowFooterLine != 0 {
		defaults.ShowFooterLine = overrides.ShowFooterLine
	}
	return defaults
}

// mergeSeparators combines default and override separator settings, preserving defaults for unset (zero) overrides.
func mergeSeparators(defaults, overrides tw.Separators) tw.Separators {
	if overrides.ShowHeader != 0 {
		defaults.ShowHeader = overrides.ShowHeader
	}
	if overrides.ShowFooter != 0 {
		defaults.ShowFooter = overrides.ShowFooter
	}
	if overrides.BetweenRows != 0 {
		defaults.BetweenRows = overrides.BetweenRows
	}
	if overrides.BetweenColumns != 0 {
		defaults.BetweenColumns = overrides.BetweenColumns
	}
	return defaults
}

// mergeSettings combines default and override settings, preserving defaults for unset (zero) overrides.
func mergeSettings(defaults, overrides tw.Settings) tw.Settings {
	if overrides.Separators.ShowHeader != tw.Unknown {
		defaults.Separators.ShowHeader = overrides.Separators.ShowHeader
	}
	if overrides.Separators.ShowFooter != tw.Unknown {
		defaults.Separators.ShowFooter = overrides.Separators.ShowFooter
	}
	if overrides.Separators.BetweenRows != tw.Unknown {
		defaults.Separators.BetweenRows = overrides.Separators.BetweenRows
	}
	if overrides.Separators.BetweenColumns != tw.Unknown {
		defaults.Separators.BetweenColumns = overrides.Separators.BetweenColumns
	}
	if overrides.Lines.ShowTop != tw.Unknown {
		defaults.Lines.ShowTop = overrides.Lines.ShowTop
	}
	if overrides.Lines.ShowBottom != tw.Unknown {
		defaults.Lines.ShowBottom = overrides.Lines.ShowBottom
	}
	if overrides.Lines.ShowHeaderLine != tw.Unknown {
		defaults.Lines.ShowHeaderLine = overrides.Lines.ShowHeaderLine
	}
	if overrides.Lines.ShowFooterLine != tw.Unknown {
		defaults.Lines.ShowFooterLine = overrides.Lines.ShowFooterLine
	}

	if overrides.CompactMode != tw.Unknown {
		defaults.CompactMode = overrides.CompactMode
	}

	// if overrides.Cushion != tw.Unknown {
	//	defaults.Cushion = overrides.Cushion
	//}

	return defaults
}

// MergeRendition merges the 'override' rendition into the 'current' rendition.
// It only updates fields in 'current' if they are explicitly set (non-zero/non-nil) in 'override'.
// This allows for partial updates to a renderer's configuration.
func mergeRendition(current, override tw.Rendition) tw.Rendition {
	// Merge Borders: Only update if override border states are explicitly set (not 0).
	// A tw.State's zero value is 0, which is distinct from tw.On (1) or tw.Off (-1).
	// So, if override.Borders.Left is 0, it means "not specified", so we keep current.
	if override.Borders.Left != 0 {
		current.Borders.Left = override.Borders.Left
	}
	if override.Borders.Right != 0 {
		current.Borders.Right = override.Borders.Right
	}
	if override.Borders.Top != 0 {
		current.Borders.Top = override.Borders.Top
	}
	if override.Borders.Bottom != 0 {
		current.Borders.Bottom = override.Borders.Bottom
	}

	// Merge Symbols: Only update if override.Symbols is not nil.
	if override.Symbols != nil {
		current.Symbols = override.Symbols
	}

	// Merge Settings: Use the existing mergeSettings for granular control.
	// mergeSettings already handles preserving defaults for unset (zero) overrides.
	current.Settings = mergeSettings(current.Settings, override.Settings)

	// Streaming flag: typically set at renderer creation, but can be overridden if needed.
	// For now, let's assume it's not commonly changed post-creation by a generic rendition merge.
	// If override provides a different streaming capability, it might indicate a fundamental
	// change that a simple merge shouldn't handle without more context.
	// current.Streaming = override.Streaming // Or keep current.Streaming

	return current
}