import Styles from "@/constants/Styles";
import { useTheme } from "@/providers/ThemeProvider";
import { MaterialCommunityIcons } from "@expo/vector-icons";
import { useState } from "react";
import { LayoutChangeEvent, Pressable, View } from "react-native";
import Text from "./Text";

type FileItem = {
   name: string
   extension: string
}

type Props = {
   status?: number // 0=belum selesai, 1=selesai, 2=menunggu persetujuan
   title: string
   dateStart: string
   dateEnd: string
   files?: FileItem[]
   onPress?: () => void
}

const CHAR_W = 6.5
const ICON_W = 17
const PAD_H = 16
const GAP = 6
const PLUS_W = 72

function estimateChipWidth(label: string) {
   return PAD_H + ICON_W + label.length * CHAR_W
}

function getVisibleChips(files: FileItem[], containerWidth: number) {
   if (containerWidth === 0) return { visible: [], extra: files.length }

   let used = 0
   const visible: FileItem[] = []

   for (let i = 0; i < files.length; i++) {
      const label = `${files[i].name}.${files[i].extension}`
      const chipW = estimateChipWidth(label)
      const isLast = i === files.length - 1
      const plusChipW = isLast ? 0 : PLUS_W + GAP
      const gapW = visible.length > 0 ? GAP : 0

      if (used + gapW + chipW + plusChipW <= containerWidth) {
         visible.push(files[i])
         used += gapW + chipW
      } else {
         break
      }
   }

   return { visible, extra: files.length - visible.length }
}

function getFileIcon(extension: string): keyof typeof MaterialCommunityIcons.glyphMap {
   const ext = extension.toLowerCase()
   if (['jpg', 'jpeg', 'png', 'gif', 'webp', 'heic', 'heif'].includes(ext)) return 'image-outline'
   if (ext === 'pdf') return 'file-pdf-box'
   if (['mp4', 'mov', 'avi', 'mkv'].includes(ext)) return 'video-outline'
   if (['doc', 'docx'].includes(ext)) return 'file-word-outline'
   if (['xls', 'xlsx'].includes(ext)) return 'file-excel-outline'
   if (['zip', 'rar', '7z'].includes(ext)) return 'zip-box-outline'
   return 'file-outline'
}

const AMBER = '#FFA94D'

function getStatusStyle(status: number | undefined, successColor: string, dimmed: string) {
   if (status === 1) return { accent: successColor, badge: successColor + '25', text: successColor, label: 'Selesai' }
   if (status === 2) return { accent: AMBER, badge: AMBER + '25', text: AMBER, label: 'Menunggu Persetujuan' }
   return { accent: dimmed + '80', badge: dimmed + '18', text: dimmed, label: 'Belum Selesai' }
}

export default function ItemSectionTanggalTugas({ status, title, dateStart, dateEnd, files = [], onPress }: Props) {
   const { colors, activeTheme } = useTheme()
   const [containerWidth, setContainerWidth] = useState(0)

   const { visible, extra } = getVisibleChips(files, containerWidth)

   function onChipsLayout(e: LayoutChangeEvent) {
      const w = e.nativeEvent.layout.width
      if (w !== containerWidth) setContainerWidth(w)
   }

   const dimmed = colors.dimmed.slice(0, 7)
   const successColor = activeTheme === 'dark' ? '#51CF66' : colors.success
   const statusStyle = getStatusStyle(status, successColor, dimmed)

   return (
      <Pressable
         onPress={onPress}
         style={{
            flexDirection: 'row',
            borderRadius: 10,
            overflow: 'hidden',
            borderWidth: 1,
            borderColor: colors.icon + '18',
            backgroundColor: colors.card,
            marginBottom: 10,
         }}
      >
         {/* Accent bar kiri */}
         {status !== undefined && (
            <View style={{ width: 4, backgroundColor: statusStyle.accent }} />
         )}

         {/* Konten */}
         <View style={{ flex: 1, padding: 12 }}>

            {/* Judul + badge status */}
            <View style={{ flexDirection: 'row', justifyContent: 'space-between', alignItems: 'flex-start', marginBottom: 8 }}>
               <Text style={[Styles.textDefault, { flex: 1, marginRight: 8 }]}>{title}</Text>
               {status !== undefined && (
                  <View style={{
                     backgroundColor: statusStyle.badge,
                     borderRadius: 20,
                     paddingHorizontal: 8,
                     paddingVertical: 3,
                     alignSelf: 'flex-start',
                  }}>
                     <Text style={[Styles.textSmallSemiBold, { color: statusStyle.text }]}>
                        {statusStyle.label}
                     </Text>
                  </View>
               )}
            </View>

            {/* Tanggal */}
            <View style={{ flexDirection: 'row', alignItems: 'center', marginBottom: files.length > 0 ? 8 : 0 }}>
               <MaterialCommunityIcons name="calendar-outline" size={13} color={colors.dimmed} style={{ marginRight: 4 }} />
               <Text style={[Styles.textSmallSemiBold, { color: colors.dimmed }]}>{dateStart}</Text>
               <MaterialCommunityIcons name="arrow-right" size={13} color={colors.dimmed} style={{ marginHorizontal: 4 }} />
               <Text style={[Styles.textSmallSemiBold, { color: colors.dimmed }]}>{dateEnd}</Text>
            </View>

            {/* Chips lampiran */}
            {files.length > 0 && (
               <View
                  style={{ flexDirection: 'row', gap: GAP, overflow: 'hidden' }}
                  onLayout={onChipsLayout}
               >
                  {visible.map((file, index) => {
                     const label = `${file.name}.${file.extension}`
                     const chipW = Math.min(estimateChipWidth(label), containerWidth * 0.55)
                     return (
                        <View
                           key={index}
                           style={{
                              flexDirection: 'row',
                              alignItems: 'center',
                              backgroundColor: dimmed + '18',
                              borderRadius: 6,
                              paddingHorizontal: 8,
                              paddingVertical: 3,
                              width: chipW,
                           }}
                        >
                           <MaterialCommunityIcons
                              name={getFileIcon(file.extension)}
                              size={13}
                              color={colors.dimmed}
                              style={{ marginRight: 4 }}
                           />
                           <Text
                              style={[Styles.textSmallSemiBold, { color: colors.dimmed, flex: 1 }]}
                              numberOfLines={1}
                              ellipsizeMode="tail"
                           >
                              {label}
                           </Text>
                        </View>
                     )
                  })}
                  {extra > 0 && (
                     <View style={{
                        backgroundColor: dimmed + '18',
                        borderRadius: 6,
                        paddingHorizontal: 8,
                        paddingVertical: 3,
                     }}>
                        <Text style={[Styles.textSmallSemiBold, { color: colors.dimmed }]}>
                           +{extra} lainnya
                        </Text>
                     </View>
                  )}
               </View>
            )}
         </View>
      </Pressable>
   )
}