package page

import (
	"fmt"

	"github.com/go-gl/gl/v3.3-core/gl"
	"github.com/veandco/go-sdl2/sdl"
	"rhemawavetech.com/rhemawave/internal/colors"
	"rhemawavetech.com/rhemawave/internal/db"
	"rhemawavetech.com/rhemawave/internal/fontManager"
	"rhemawavetech.com/rhemawave/internal/logger"
	"rhemawavetech.com/rhemawave/internal/shaderManager"
)

type ProclamationOptions struct {
	Base
	font            *fontManager.FontEntry
	textShader      *shaderManager.Shader
	solidShader     *shaderManager.Shader
	title           StringItem
	prompt          StringItem
	proclamations   []StringItem
	proclamationIDs []string
	activeMap       map[int]bool // Maps display index to selected state
	highlightIndex  int
	verticalMargin  int32
}

func (p *ProclamationOptions) Init(ctx *PageCtx) error {
	var err error
	p.verticalMargin = int32(20)
	p.activeMap = make(map[int]bool)
	p.proclamationIDs = make([]string, 0)

	// Get font
	fm := fontManager.Get()
	font, ok := fm.GetFont("Roboto-Regular")
	if !ok {
		return fmt.Errorf("failed to get font: %w", sdl.GetError())
	}
	p.font = font

	// Get shaders
	sm := shaderManager.Get()
	p.textShader, ok = sm.Get("text")
	if !ok {
		return fmt.Errorf("failed to get text shader: %w", sdl.GetError())
	}

	p.solidShader, ok = sm.Get("solid_color")
	if !ok {
		return fmt.Errorf("failed to get solid_color shader: %w", sdl.GetError())
	}

	// Initialize base
	if err := p.Base.Init(ctx); err != nil {
		return fmt.Errorf("base init failed: %w", err)
	}

	// Get font size from database
	baseFontSize := ctx.CfgPtr.StandardFontSize

	// Calculate scales
	titleScale := float32(64) / float32(baseFontSize)
	itemScale := float32(32) / float32(baseFontSize)

	// Create title
	p.title, err = NewStringItem("Select Proclamations", p.font, colors.White)
	if err != nil {
		return fmt.Errorf("creating title: %w", err)
	}
	p.title.Scale(titleScale)

	// Create prompt
	p.prompt, err = NewStringItem("Arrow Keys to navigate | Space to toggle | F2 to run | Enter to return", p.font, colors.White)
	if err != nil {
		return fmt.Errorf("creating prompt: %w", err)
	}
	p.prompt.Scale(itemScale)

	// Load proclamations from database
	var proclamations []db.Proclamation
	if result := p.Context.DbPtr.Find(&proclamations); result.Error != nil {
		logger.Error("unable to query database for proclamations: %v", result.Error)
		return fmt.Errorf("%s", result.Error)
	}

	// Create UI items for each available proclamation
	for _, proclamation := range proclamations {
		if !proclamation.Available {
			continue
		}

		label, err := NewStringItem(proclamation.Name, p.font, colors.White)
		if err != nil {
			return fmt.Errorf("creating proclamation label: %w", err)
		}

		label.Scale(itemScale)
		p.proclamations = append(p.proclamations, label)
		p.proclamationIDs = append(p.proclamationIDs, proclamation.ID)

		// Set initial selection state
		if proclamation.Selected {
			p.activeMap[len(p.proclamations)-1] = true
		}
	}

	p.layout()
	return nil
}

func (p *ProclamationOptions) layout() {
	// Position title at bottom
	p.title.X = p.ScreenCenterX - p.title.W/2
	p.title.Y = p.ScreenHeight - p.title.H - p.verticalMargin*2

	// Position prompt above title
	p.prompt.X = p.ScreenCenterX - p.prompt.W/2
	p.prompt.Y = p.title.Y - p.verticalMargin*2 - p.prompt.H

	// Position proclamation items stacked upward from prompt
	for i := range p.proclamations {
		p.proclamations[i].X = p.ScreenCenterX - p.proclamations[i].W/2
		if i == 0 {
			p.proclamations[i].Y = p.prompt.Y - p.verticalMargin*2 - p.proclamations[i].H
		} else {
			p.proclamations[i].Y = p.proclamations[i-1].Y - p.proclamations[i].H - 10
		}
	}
}

func (p *ProclamationOptions) HandleEvent(event *sdl.Event) error {
	switch e := (*event).(type) {
	case *sdl.KeyboardEvent:
		if e.Type != sdl.KEYDOWN {
			return nil
		}
		switch e.Keysym.Sym {
		case sdl.K_UP:
			if p.highlightIndex > 0 {
				p.highlightIndex--
			}
		case sdl.K_DOWN:
			if p.highlightIndex < len(p.proclamations)-1 {
				p.highlightIndex++
			}
		case sdl.K_BACKSPACE:
			p.Context.NavigateTo(SETTINGS)
		case sdl.K_SPACE:
			// Toggle selection for highlighted item
			if p.activeMap[p.highlightIndex] {
				delete(p.activeMap, p.highlightIndex)
			} else {
				p.activeMap[p.highlightIndex] = true
			}

			// Immediately save to database
			if err := p.toggleProclamation(p.highlightIndex); err != nil {
				return fmt.Errorf("failed to toggle proclamation: %w", err)
			}
		case sdl.K_RETURN:
			// Just return to settings - no saving needed
			p.Context.NavigateTo(SETTINGS)
		}
	}
	return nil
}

// toggleProclamation immediately updates the database for the proclamation at the given display index
func (p *ProclamationOptions) toggleProclamation(displayIndex int) error {
	if displayIndex < 0 || displayIndex >= len(p.proclamationIDs) {
		return fmt.Errorf("invalid display index %d", displayIndex)
	}

	dbID := p.proclamationIDs[displayIndex]
	isSelected := p.activeMap[displayIndex]

	// Get the proclamation from database
	var proclamation db.Proclamation
	proclamation.ID = dbID
	if result := p.Context.DbPtr.Find(&proclamation); result.Error != nil {
		logger.Error("unable to query proclamation %s from database: %v", proclamation.ID, result.Error)
	}

	// Update the Selected field
	proclamation.Selected = isSelected
	if result := p.Context.DbPtr.Save(&proclamation); result.Error != nil {
		logger.Error("failed to update proclamation %s: %v", proclamation.ID, result.Error)
		return fmt.Errorf("%s", result.Error)
	}

	return nil
}

func (p *ProclamationOptions) Render() error {
	// Always render title and prompt
	p.RenderTexture(p.textShader, p.title.ID, p.title.Position(), p.title.RawDimensions(), p.title.Color)
	p.RenderTexture(p.textShader, p.prompt.ID, p.prompt.Position(), p.prompt.RawDimensions(), p.prompt.Color)

	// No proclamations to display
	if len(p.proclamations) == 0 {
		return nil
	}

	// Render highlight box behind selected item
	p.RenderSolidColorQuad(
		p.solidShader,
		p.proclamations[p.highlightIndex].Position(),
		p.proclamations[p.highlightIndex].RawDimensions(),
		colors.White,
	)

	// Render proclamation items with appropriate colors
	for i, item := range p.proclamations {
		if p.activeMap[i] {
			// Selected items are green
			item.Color = colors.Green
		} else if i == p.highlightIndex {
			// Highlighted item is black (shows on white background)
			item.Color = colors.Black
		} else {
			// Normal items are white
			item.Color = colors.White
		}
		p.RenderTexture(p.textShader, item.ID, item.Position(), item.RawDimensions(), item.Color)
	}

	return nil
}

func (p *ProclamationOptions) Destroy() error {
	gl.DeleteTextures(1, &p.title.ID)
	gl.DeleteTextures(1, &p.prompt.ID)
	for _, item := range p.proclamations {
		gl.DeleteTextures(1, &item.ID)
	}
	return nil
}