"use client"

import { zodResolver } from "@hookform/resolvers/zod"
import { ChevronsUpDown } from "lucide-react"
import { useForm } from "react-hook-form"
import { z } from "zod"
import { useEffect } from "react"
import { useTheme } from "next-themes"

import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group"
import { toast } from "@/hooks/use-toast"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "../ui/card"
import { ThemeCustomizer } from "./theme-customizer"
import { getAppearanceSettings, setAppearanceSettings } from "@/lib/data"
import { Select } from "@/components/ui/select"

const appearanceFormSchema = z.object({
  theme: z.enum(["light", "dark"], {
    required_error: "Please select a theme.",
  }),
  font: z.enum(["inter", "manrope", "system", "poppins", "pt-sans"], {
    invalid_type_error: "Select a font",
    required_error: "Please select a font.",
  }),
})

type AppearanceFormValues = z.infer<typeof appearanceFormSchema>

export function AppearanceForm() {
  const { setTheme, theme: activeTheme } = useTheme()

  const form = useForm<AppearanceFormValues>({
    resolver: zodResolver(appearanceFormSchema),
    defaultValues: getAppearanceSettings(),
  })

  useEffect(() => {
    const settings = getAppearanceSettings();
    form.reset(settings);
    setTheme(settings.theme);
    document.body.dataset.font = settings.font;
  }, [form, setTheme]);

  function onSubmit(data: AppearanceFormValues) {
    setAppearanceSettings(data);
    setTheme(data.theme);

    // This is a bit of a hack to apply the font. 
    // In a real app, you'd likely have a more robust system.
    document.body.classList.remove('font-body', 'font-headline', 'font-sans');
    document.body.style.fontFamily = ''; // Reset
    if (data.font === 'manrope') {
       document.body.style.fontFamily = "'Manrope', sans-serif";
    } else if (data.font === 'inter') {
       document.body.style.fontFamily = "'Inter', sans-serif";
    } else if (data.font === 'system') {
      document.body.style.fontFamily = "system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji'";
    } else if (data.font === 'poppins') {
        document.body.classList.add('font-headline');
    } else if (data.font === 'pt-sans') {
        document.body.classList.add('font-body');
    }


    toast({
      title: "Appearance settings saved",
      description: "Your new appearance settings have been applied.",
    })
  }

  return (
    <Card>
      <CardHeader>
        <CardTitle>Appearance</CardTitle>
        <CardDescription>
          Customize the look and feel of your application.
        </CardDescription>
      </CardHeader>
      <CardContent>
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-8">
        <FormField
          control={form.control}
          name="font"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Font</FormLabel>
              <div className="relative w-max">
                 <Select onValueChange={field.onChange} defaultValue={field.value}>
                    <FormControl>
                      <select
                        className="flex h-9 w-[200px] items-center justify-between whitespace-nowrap rounded-md border border-input bg-transparent px-3 py-2 text-sm shadow-sm ring-offset-background placeholder:text-muted-foreground focus:outline-none focus:ring-1 focus:ring-ring disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1"
                        {...field}
                      >
                        <option value="inter">Inter</option>
                        <option value="manrope">Manrope</option>
                        <option value="poppins">Poppins</option>
                        <option value="pt-sans">PT Sans</option>
                        <option value="system">System</option>
                      </select>
                    </FormControl>
                 </Select>
                <ChevronsUpDown className="absolute right-3 top-2.5 h-4 w-4 opacity-50" />
              </div>
              <FormDescription>
                Set the font you want to use in the dashboard.
              </FormDescription>
              <FormMessage />
            </FormItem>
          )}
        />
        <FormField
          control={form.control}
          name="theme"
          render={({ field }) => (
            <FormItem className="space-y-1">
              <FormLabel>Theme</FormLabel>
              <FormDescription>
                Select the theme for the dashboard.
              </FormDescription>
              <FormMessage />
              <RadioGroup
                onValueChange={field.onChange}
                defaultValue={field.value}
                className="grid max-w-md grid-cols-2 gap-8 pt-2"
              >
                <FormItem>
                  <FormLabel className="[&:has([data-state=checked])>div]:border-primary">
                    <FormControl>
                      <RadioGroupItem value="light" className="sr-only" />
                    </FormControl>
                    <div className="items-center rounded-md border-2 border-muted p-1 hover:border-accent">
                      <div className="space-y-2 rounded-sm bg-[#ecedef] p-2">
                        <div className="space-y-2 rounded-md bg-white p-2 shadow-sm">
                          <div className="h-2 w-[80px] rounded-lg bg-[#ecedef]" />
                          <div className="h-2 w-[100px] rounded-lg bg-[#ecedef]" />
                        </div>
                        <div className="flex items-center space-x-2 rounded-md bg-white p-2 shadow-sm">
                          <div className="h-4 w-4 rounded-full bg-[#ecedef]" />
                          <div className="h-2 w-[100px] rounded-lg bg-[#ecedef]" />
                        </div>
                        <div className="flex items-center space-x-2 rounded-md bg-white p-2 shadow-sm">
                          <div className="h-4 w-4 rounded-full bg-[#ecedef]" />
                          <div className="h-2 w-[100px] rounded-lg bg-[#ecedef]" />
                        </div>
                      </div>
                    </div>
                    <span className="block w-full p-2 text-center font-normal">
                      Light
                    </span>
                  </FormLabel>
                </FormItem>
                <FormItem>
                  <FormLabel className="[&:has([data-state=checked])>div]:border-primary">
                    <FormControl>
                      <RadioGroupItem value="dark" className="sr-only" />
                    </FormControl>
                    <div className="items-center rounded-md border-2 border-muted bg-popover p-1 hover:bg-accent hover:text-accent-foreground">
                      <div className="space-y-2 rounded-sm bg-slate-950 p-2">
                        <div className="space-y-2 rounded-md bg-slate-800 p-2 shadow-sm">
                          <div className="h-2 w-[80px] rounded-lg bg-slate-400" />
                          <div className="h-2 w-[100px] rounded-lg bg-slate-400" />
                        </div>
                        <div className="flex items-center space-x-2 rounded-md bg-slate-800 p-2 shadow-sm">
                          <div className="h-4 w-4 rounded-full bg-slate-400" />
                          <div className="h-2 w-[100px] rounded-lg bg-slate-400" />
                        </div>
                        <div className="flex items-center space-x-2 rounded-md bg-slate-800 p-2 shadow-sm">
                          <div className="h-4 w-4 rounded-full bg-slate-400" />
                          <div className="h-2 w-[100px] rounded-lg bg-slate-400" />
                        </div>
                      </div>
                    </div>
                    <span className="block w-full p-2 text-center font-normal">
                      Dark
                    </span>
                  </FormLabel>
                </FormItem>
              </RadioGroup>
            </FormItem>
          )}
        />
        
        <ThemeCustomizer />


        <Button type="submit">Update appearance</Button>
      </form>
    </Form>
    </CardContent>
    </Card>
  )
}