import { IconLoader2 } from "@tabler/icons-react"
import { useEffect, useState } from "react"
import { useTranslation } from "react-i18next"

import { type ModelInfo, setDefaultModel, updateModel } from "@/api/models"
import { maskedSecretPlaceholder } from "@/components/secret-placeholder"
import {
  AdvancedSection,
  Field,
  KeyInput,
  SwitchCardField,
} from "@/components/shared-form"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Textarea } from "@/components/ui/textarea"
import {
  Sheet,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
} from "@/components/ui/sheet"

interface EditForm {
  apiKey: string
  apiBase: string
  proxy: string
  authMethod: string
  connectMode: string
  workspace: string
  rpm: string
  maxTokensField: string
  requestTimeout: string
  thinkingLevel: string
  extraBody: string
}

interface EditModelSheetProps {
  model: ModelInfo | null
  open: boolean
  onClose: () => void
  onSaved: () => void
}

export function EditModelSheet({
  model,
  open,
  onClose,
  onSaved,
}: EditModelSheetProps) {
  const { t } = useTranslation()
  const [form, setForm] = useState<EditForm>({
    apiKey: "",
    apiBase: "",
    proxy: "",
    authMethod: "",
    connectMode: "",
    workspace: "",
    rpm: "",
    maxTokensField: "",
    requestTimeout: "",
    thinkingLevel: "",
    extraBody: "",
  })
  const [saving, setSaving] = useState(false)
  const [setAsDefault, setSetAsDefault] = useState(false)
  const [error, setError] = useState("")

  useEffect(() => {
    if (model) {
      setForm({
        apiKey: "",
        apiBase: model.api_base ?? "",
        proxy: model.proxy ?? "",
        authMethod: model.auth_method ?? "",
        connectMode: model.connect_mode ?? "",
        workspace: model.workspace ?? "",
        rpm: model.rpm ? String(model.rpm) : "",
        maxTokensField: model.max_tokens_field ?? "",
        requestTimeout: model.request_timeout
          ? String(model.request_timeout)
          : "",
        thinkingLevel: model.thinking_level ?? "",
        extraBody: model.extra_body
          ? JSON.stringify(model.extra_body, null, 2)
          : "",
      })
      setSetAsDefault(model.is_default)
      setError("")
    }
  }, [model])

  const setField =
    (key: keyof EditForm) => (e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>) =>
      setForm((f) => ({ ...f, [key]: e.target.value }))

  const handleSave = async () => {
    if (!model) return
    setSaving(true)
    setError("")
    try {
      await updateModel(model.index, {
        model_name: model.model_name,
        model: model.model,
        api_base: form.apiBase || undefined,
        api_key: form.apiKey || undefined,
        proxy: form.proxy || undefined,
        auth_method: form.authMethod || undefined,
        connect_mode: form.connectMode || undefined,
        workspace: form.workspace || undefined,
        rpm: form.rpm ? Number(form.rpm) : undefined,
        max_tokens_field: form.maxTokensField || undefined,
        request_timeout: form.requestTimeout
          ? Number(form.requestTimeout)
          : undefined,
        thinking_level: form.thinkingLevel || undefined,
        extra_body: form.extraBody.trim()
          ? JSON.parse(form.extraBody.trim())
          : {},
      })
      if (setAsDefault && !model.is_default) {
        await setDefaultModel(model.model_name)
      }
      onSaved()
      onClose()
    } catch (e) {
      setError(e instanceof Error ? e.message : t("models.edit.saveError"))
    } finally {
      setSaving(false)
    }
  }

  const isOAuth = model?.auth_method === "oauth"
  const apiKeyPlaceholder = model?.configured
    ? maskedSecretPlaceholder(
        model.api_key,
        t("models.field.apiKeyPlaceholderSet"),
      )
    : t("models.field.apiKeyPlaceholder")

  return (
    <Sheet open={open} onOpenChange={(v) => !v && onClose()}>
      <SheetContent
        side="right"
        className="flex flex-col gap-0 p-0 data-[side=right]:!w-full data-[side=right]:sm:!w-[560px] data-[side=right]:sm:!max-w-[560px]"
      >
        <SheetHeader className="border-b-muted border-b px-6 py-5">
          <SheetTitle className="text-base">
            {t("models.edit.title", { name: model?.model_name })}
          </SheetTitle>
          <SheetDescription className="font-mono text-xs">
            {model?.model}
          </SheetDescription>
        </SheetHeader>

        <div className="min-h-0 flex-1 overflow-y-auto">
          <div className="space-y-5 px-6 py-5">
            {!isOAuth && (
              <Field
                label={t("models.field.apiKey")}
                hint={
                  model?.configured ? t("models.edit.apiKeyHint") : undefined
                }
              >
                <KeyInput
                  value={form.apiKey}
                  onChange={(v) => setForm((f) => ({ ...f, apiKey: v }))}
                  placeholder={apiKeyPlaceholder}
                />
              </Field>
            )}

            <Field
              label={t("models.field.apiBase")}
              hint={isOAuth ? t("models.edit.oauthNote") : undefined}
            >
              <Input
                value={form.apiBase}
                onChange={setField("apiBase")}
                placeholder="https://api.example.com/v1"
                disabled={isOAuth}
              />
            </Field>

            <SwitchCardField
              label={t("models.defaultOnSave.label")}
              hint={t("models.defaultOnSave.description")}
              checked={setAsDefault}
              onCheckedChange={setSetAsDefault}
            />

            <AdvancedSection>
              <Field
                label={t("models.field.proxy")}
                hint={t("models.field.proxyHint")}
              >
                <Input
                  value={form.proxy}
                  onChange={setField("proxy")}
                  placeholder="http://127.0.0.1:7890"
                />
              </Field>

              <Field
                label={t("models.field.authMethod")}
                hint={t("models.field.authMethodHint")}
              >
                <Input
                  value={form.authMethod}
                  onChange={setField("authMethod")}
                  placeholder="oauth"
                />
              </Field>

              <Field
                label={t("models.field.connectMode")}
                hint={t("models.field.connectModeHint")}
              >
                <Input
                  value={form.connectMode}
                  onChange={setField("connectMode")}
                  placeholder="stdio"
                />
              </Field>

              <Field
                label={t("models.field.workspace")}
                hint={t("models.field.workspaceHint")}
              >
                <Input
                  value={form.workspace}
                  onChange={setField("workspace")}
                  placeholder="/path/to/workspace"
                />
              </Field>

              <Field
                label={t("models.field.requestTimeout")}
                hint={t("models.field.requestTimeoutHint")}
              >
                <Input
                  value={form.requestTimeout}
                  onChange={setField("requestTimeout")}
                  placeholder="60"
                  type="number"
                  min={0}
                />
              </Field>

              <Field
                label={t("models.field.rpm")}
                hint={t("models.field.rpmHint")}
              >
                <Input
                  value={form.rpm}
                  onChange={setField("rpm")}
                  placeholder="60"
                  type="number"
                  min={0}
                />
              </Field>

              <Field
                label={t("models.field.thinkingLevel")}
                hint={t("models.field.thinkingLevelHint")}
              >
                <Input
                  value={form.thinkingLevel}
                  onChange={setField("thinkingLevel")}
                  placeholder="off"
                />
              </Field>

              <Field
                label={t("models.field.maxTokensField")}
                hint={t("models.field.maxTokensFieldHint")}
              >
                <Input
                  value={form.maxTokensField}
                  onChange={setField("maxTokensField")}
                  placeholder="max_completion_tokens"
                />
              </Field>

              <Field
                label={t("models.field.extraBody")}
                hint={t("models.field.extraBodyHint")}
              >
                <Textarea
                  value={form.extraBody}
                  onChange={setField("extraBody")}
                  placeholder='{"key": "value"}'
                  rows={3}
                />
              </Field>
            </AdvancedSection>

            {error && (
              <p className="text-destructive bg-destructive/10 rounded-md px-3 py-2 text-sm">
                {error}
              </p>
            )}
          </div>
        </div>

        <SheetFooter className="border-t-muted border-t px-6 py-4">
          <Button variant="ghost" onClick={onClose} disabled={saving}>
            {t("common.cancel")}
          </Button>
          <Button onClick={handleSave} disabled={saving}>
            {saving && <IconLoader2 className="size-4 animate-spin" />}
            {t("common.save")}
          </Button>
        </SheetFooter>
      </SheetContent>
    </Sheet>
  )
}