import { useState } from "react"
import {
  useDataSources,
  useCreateDataSource,
  useUpdateDataSource,
  useDeleteDataSource,
} from "@/api/data-sources"
import type { DataSource, DataSourceConfig, SourceType } from "@/api/types"
import { Button } from "@/components/ui/button"
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card"
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogFooter,
} from "@/components/ui/dialog"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select"
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog"
import { Badge } from "@/components/ui/badge"
import { Plus, Pencil, Trash2, X, Eye, EyeOff } from "lucide-react"
import { toast } from "sonner"

const SOURCE_TYPES: SourceType[] = [
  "weather",
  "media",
  "rss",
  "http_json",
  "webhook",
  "clock",
  "static_text",
]

const EXTERNAL_TYPES: SourceType[] = ["weather", "media", "rss", "http_json", "webhook"]

function defaultConfigFor(sourceType: SourceType): DataSourceConfig {
  if (sourceType === "clock") return { type: "clock", format: "%H:%M:%S", timezone: "UTC" }
  if (sourceType === "static_text") return { type: "static_text", text: "" }
  return { type: "external", url: null, api_key: null, headers: [] }
}

const EMPTY: DataSource = {
  id: 0,
  name: "",
  source_type: "http_json",
  poll_interval_secs: 300,
  config: { type: "external", url: null, api_key: null, headers: [] },
}

export function DataSourcesPage() {
  const { data: sources = [], isLoading } = useDataSources()
  const create = useCreateDataSource()
  const update = useUpdateDataSource()
  const del = useDeleteDataSource()

  const [editing, setEditing] = useState<DataSource | null>(null)
  const [deleting, setDeleting] = useState<number | null>(null)

  function openNew() {
    const nextId =
      sources.length > 0 ? Math.max(...sources.map((s) => s.id)) + 1 : 1
    setEditing({ ...EMPTY, id: nextId })
  }

  function openEdit(ds: DataSource) {
    setEditing({ ...ds })
  }

  async function save() {
    if (!editing) return
    const isNew = !sources.some((s) => s.id === editing.id)
    try {
      if (isNew) {
        await create.mutateAsync(editing)
        toast.success("Data source created")
      } else {
        await update.mutateAsync(editing)
        toast.success("Data source updated")
      }
      setEditing(null)
    } catch (e) {
      toast.error(String(e))
    }
  }

  async function confirmDelete() {
    if (deleting == null) return
    try {
      await del.mutateAsync(deleting)
      toast.success("Data source deleted")
    } catch (e) {
      toast.error(String(e))
    }
    setDeleting(null)
  }

  if (isLoading) return <div className="text-muted-foreground p-4">Loading…</div>

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-semibold tracking-tight">
            Data Sources
          </h1>
          <p className="text-muted-foreground text-sm">
            Configure external data feeds
          </p>
        </div>
        <Button onClick={openNew}>
          <Plus className="mr-2 h-4 w-4" />
          Add Source
        </Button>
      </div>

      {sources.length === 0 ? (
        <Card>
          <CardContent className="py-12 text-center">
            <p className="text-muted-foreground">
              No data sources configured yet.
            </p>
          </CardContent>
        </Card>
      ) : (
        <div className="grid gap-3">
          {sources.map((ds) => (
            <Card key={ds.id}>
              <CardHeader className="flex flex-row items-center justify-between py-3">
                <div className="space-y-1">
                  <CardTitle className="text-base">{ds.name}</CardTitle>
                  <CardDescription className="flex items-center gap-2">
                    <Badge variant="secondary">{ds.source_type}</Badge>
                    {ds.poll_interval_secs > 0 && <span>every {ds.poll_interval_secs}s</span>}
                    {ds.config.type === "external" && ds.config.url && (
                      <span className="text-muted-foreground max-w-xs truncate text-xs">
                        {ds.config.url}
                      </span>
                    )}
                  </CardDescription>
                </div>
                <div className="flex gap-1">
                  <Button
                    variant="ghost"
                    size="icon"
                    onClick={() => openEdit(ds)}
                  >
                    <Pencil className="h-4 w-4" />
                  </Button>
                  <Button
                    variant="ghost"
                    size="icon"
                    onClick={() => setDeleting(ds.id)}
                  >
                    <Trash2 className="h-4 w-4" />
                  </Button>
                </div>
              </CardHeader>
            </Card>
          ))}
        </div>
      )}

      {/* Edit / Create Dialog */}
      <Dialog open={!!editing} onOpenChange={(o) => !o && setEditing(null)}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>
              {editing && sources.some((s) => s.id === editing.id)
                ? "Edit Data Source"
                : "New Data Source"}
            </DialogTitle>
          </DialogHeader>
          {editing && (
            <DataSourceForm value={editing} onChange={setEditing} />
          )}
          <DialogFooter>
            <Button variant="outline" onClick={() => setEditing(null)}>
              Cancel
            </Button>
            <Button
              onClick={save}
              disabled={
                !editing?.name ||
                (EXTERNAL_TYPES.includes(editing.source_type) &&
                  editing.source_type !== "webhook" &&
                  editing.poll_interval_secs <= 0) ||
                (EXTERNAL_TYPES.includes(editing.source_type) &&
                  editing.source_type !== "webhook" &&
                  editing.config.type === "external" &&
                  !editing.config.url)
              }
            >
              Save
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>

      {/* Delete Confirmation */}
      <AlertDialog
        open={deleting != null}
        onOpenChange={(o) => !o && setDeleting(null)}
      >
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Delete data source?</AlertDialogTitle>
            <AlertDialogDescription>
              This will permanently remove this data source. Widgets referencing
              it will lose their feed.
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>Cancel</AlertDialogCancel>
            <AlertDialogAction onClick={confirmDelete}>
              Delete
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  )
}

const SENSITIVE_KEYS = ["password", "secret", "token", "api_key", "apikey"]

function isSensitiveKey(key: string) {
  return SENSITIVE_KEYS.some((s) => key.toLowerCase().includes(s))
}

function HeaderRow({
  headerKey,
  headerValue,
  onChangeKey,
  onChangeValue,
  onRemove,
}: {
  headerKey: string
  headerValue: string
  onChangeKey: (v: string) => void
  onChangeValue: (v: string) => void
  onRemove: () => void
}) {
  const sensitive = isSensitiveKey(headerKey)
  const [visible, setVisible] = useState(!sensitive)

  return (
    <div className="flex items-center gap-2">
      <Input
        value={headerKey}
        onChange={(e) => onChangeKey(e.target.value)}
        placeholder="key"
        className="flex-1"
      />
      <div className="relative flex-1">
        <Input
          type={sensitive && !visible ? "password" : "text"}
          value={headerValue}
          onChange={(e) => onChangeValue(e.target.value)}
          placeholder="value"
          className={sensitive ? "pr-9" : ""}
        />
        {sensitive && (
          <Button
            variant="ghost"
            size="icon"
            className="absolute top-0 right-0 h-full w-9"
            onClick={() => setVisible((v) => !v)}
          >
            {visible ? (
              <EyeOff className="h-3.5 w-3.5" />
            ) : (
              <Eye className="h-3.5 w-3.5" />
            )}
          </Button>
        )}
      </div>
      <Button variant="ghost" size="icon" onClick={onRemove}>
        <X className="h-3 w-3" />
      </Button>
    </div>
  )
}

function DataSourceForm({
  value,
  onChange,
}: {
  value: DataSource
  onChange: (ds: DataSource) => void
}) {
  const set = <K extends keyof DataSource>(k: K, v: DataSource[K]) =>
    onChange({ ...value, [k]: v })

  const setConfig = (patch: Partial<DataSourceConfig>) =>
    onChange({ ...value, config: { ...value.config, ...patch } as DataSourceConfig })

  const onSourceTypeChange = (t: SourceType) => {
    onChange({ ...value, source_type: t, config: defaultConfigFor(t) })
  }

  const isExternal = value.config.type === "external"
  const isClock = value.config.type === "clock"
  const isStaticText = value.config.type === "static_text"

  return (
    <div className="grid gap-4 py-2">
      <div className="grid gap-2">
        <Label>Name</Label>
        <Input
          value={value.name}
          onChange={(e) => set("name", e.target.value)}
          placeholder="e.g. weather"
        />
      </div>
      <div className="grid gap-2">
        <Label>Source Type</Label>
        <Select
          value={value.source_type}
          onValueChange={(v) => onSourceTypeChange(v as SourceType)}
        >
          <SelectTrigger>
            <SelectValue />
          </SelectTrigger>
          <SelectContent>
            {SOURCE_TYPES.map((t) => (
              <SelectItem key={t} value={t}>
                {t}
              </SelectItem>
            ))}
          </SelectContent>
        </Select>
      </div>

      {isExternal && (
        <>
          <div className="grid gap-2">
            <Label>URL</Label>
            <Input
              value={value.config.url ?? ""}
              onChange={(e) => setConfig({ url: e.target.value || null })}
              placeholder="https://..."
            />
          </div>
          <div className="grid gap-2">
            <Label>API Key</Label>
            <Input
              type="password"
              value={value.config.api_key ?? ""}
              onChange={(e) => setConfig({ api_key: e.target.value || null })}
              placeholder="Optional"
            />
          </div>
        </>
      )}

      {isClock && (
        <>
          <div className="grid gap-2">
            <Label>Format</Label>
            <Input
              value={value.config.format}
              onChange={(e) => setConfig({ format: e.target.value })}
              placeholder="%H:%M:%S"
            />
          </div>
          <div className="grid gap-2">
            <Label>Timezone</Label>
            <Input
              value={value.config.timezone}
              onChange={(e) => setConfig({ timezone: e.target.value })}
              placeholder="Europe/Warsaw"
            />
          </div>
        </>
      )}

      {isStaticText && (
        <div className="grid gap-2">
          <Label>Text</Label>
          <Input
            value={value.config.text}
            onChange={(e) => setConfig({ text: e.target.value })}
            placeholder="Hello world"
          />
        </div>
      )}

      <div className="grid gap-2">
        <Label>Poll Interval (seconds)</Label>
        <Input
          type="number"
          value={value.poll_interval_secs}
          onChange={(e) => set("poll_interval_secs", Number(e.target.value))}
          min={1}
        />
      </div>

      {isExternal && (
        <div className="grid gap-2">
          <div className="flex items-center justify-between">
            <Label>Headers</Label>
            <Button
              variant="outline"
              size="sm"
              onClick={() =>
                setConfig({ headers: [...value.config.headers, ["", ""]] })
              }
            >
              <Plus className="mr-1 h-3 w-3" />
              Add
            </Button>
          </div>
          {value.config.headers.map(([k, v], i) => (
            <HeaderRow
              key={i}
              headerKey={k}
              headerValue={v}
              onChangeKey={(newKey) => {
                const next = [...value.config.headers] as [string, string][]
                next[i] = [newKey, v]
                setConfig({ headers: next })
              }}
              onChangeValue={(newVal) => {
                const next = [...value.config.headers] as [string, string][]
                next[i] = [k, newVal]
                setConfig({ headers: next })
              }}
              onRemove={() =>
                setConfig({ headers: value.config.headers.filter((_, idx) => idx !== i) })
              }
            />
          ))}
        </div>
      )}
    </div>
  )
}