import { createResource, createEffect, createMemo, onCleanup, Show } from "solid-js"
import { createStore, reconcile } from "solid-js/store"
import { useDialog } from "@opencode-ai/ui/context/dialog"
import { Dialog } from "@opencode-ai/ui/dialog"
import { List } from "@opencode-ai/ui/list"
import { Button } from "@opencode-ai/ui/button"
import { IconButton } from "@opencode-ai/ui/icon-button"
import { TextField } from "@opencode-ai/ui/text-field"
import { normalizeServerUrl, useServer } from "@/context/server"
import { usePlatform } from "@/context/platform"
import { useNavigate } from "@solidjs/router"
import { useLanguage } from "@/context/language"
import { DropdownMenu } from "@opencode-ai/ui/dropdown-menu"
import { useGlobalSDK } from "@/context/global-sdk"
import { showToast } from "@opencode-ai/ui/toast"
import { ServerRow } from "@/components/server/server-row"
import { checkServerHealth, type ServerHealth } from "@/utils/server-health"

interface AddRowProps {
  value: string
  placeholder: string
  adding: boolean
  error: string
  status: boolean | undefined
  onChange: (value: string) => void
  onKeyDown: (event: KeyboardEvent) => void
  onBlur: () => void
}

interface EditRowProps {
  value: string
  placeholder: string
  busy: boolean
  error: string
  status: boolean | undefined
  onChange: (value: string) => void
  onKeyDown: (event: KeyboardEvent) => void
  onBlur: () => void
}

function AddRow(props: AddRowProps) {
  return (
    <div class="flex items-center px-4 min-h-14 py-3 min-w-0 flex-1">
      <div class="flex-1 min-w-0 [&_[data-slot=input-wrapper]]:relative">
        <div
          classList={{
            "size-1.5 rounded-full absolute left-3 top-1/2 -translate-y-1/2 z-10 pointer-events-none": true,
            "bg-icon-success-base": props.status === true,
            "bg-icon-critical-base": props.status === false,
            "bg-border-weak-base": props.status === undefined,
          }}
          ref={(el) => {
            // Position relative to input-wrapper
            requestAnimationFrame(() => {
              const wrapper = el.parentElement?.querySelector('[data-slot="input-wrapper"]')
              if (wrapper instanceof HTMLElement) {
                wrapper.appendChild(el)
              }
            })
          }}
        />
        <TextField
          type="text"
          hideLabel
          placeholder={props.placeholder}
          value={props.value}
          autofocus
          validationState={props.error ? "invalid" : "valid"}
          error={props.error}
          disabled={props.adding}
          onChange={props.onChange}
          onKeyDown={props.onKeyDown}
          onBlur={props.onBlur}
          class="pl-7"
        />
      </div>
    </div>
  )
}

function EditRow(props: EditRowProps) {
  return (
    <div class="flex items-center gap-3 px-4 min-w-0 flex-1" onClick={(event) => event.stopPropagation()}>
      <div
        classList={{
          "size-1.5 rounded-full shrink-0": true,
          "bg-icon-success-base": props.status === true,
          "bg-icon-critical-base": props.status === false,
          "bg-border-weak-base": props.status === undefined,
        }}
      />
      <div class="flex-1 min-w-0">
        <TextField
          type="text"
          hideLabel
          placeholder={props.placeholder}
          value={props.value}
          autofocus
          validationState={props.error ? "invalid" : "valid"}
          error={props.error}
          disabled={props.busy}
          onChange={props.onChange}
          onKeyDown={props.onKeyDown}
          onBlur={props.onBlur}
        />
      </div>
    </div>
  )
}

export function DialogSelectServer() {
  const navigate = useNavigate()
  const dialog = useDialog()
  const server = useServer()
  const platform = usePlatform()
  const globalSDK = useGlobalSDK()
  const language = useLanguage()
  const [store, setStore] = createStore({
    status: {} as Record<string, ServerHealth | undefined>,
    addServer: {
      url: "",
      adding: false,
      error: "",
      showForm: false,
      status: undefined as boolean | undefined,
    },
    editServer: {
      id: undefined as string | undefined,
      value: "",
      error: "",
      busy: false,
      status: undefined as boolean | undefined,
    },
  })
  const [defaultUrl, defaultUrlActions] = createResource(
    async () => {
      try {
        const url = await platform.getDefaultServerUrl?.()
        if (!url) return null
        return normalizeServerUrl(url) ?? null
      } catch (err) {
        showToast({
          variant: "error",
          title: language.t("common.requestFailed"),
          description: err instanceof Error ? err.message : String(err),
        })
        return null
      }
    },
    { initialValue: null },
  )
  const canDefault = createMemo(() => !!platform.getDefaultServerUrl && !!platform.setDefaultServerUrl)
  const fetcher = platform.fetch ?? globalThis.fetch

  const looksComplete = (value: string) => {
    const normalized = normalizeServerUrl(value)
    if (!normalized) return false
    const host = normalized.replace(/^https?:\/\//, "").split("/")[0]
    if (!host) return false
    if (host.includes("localhost") || host.startsWith("127.0.0.1")) return true
    return host.includes(".") || host.includes(":")
  }

  const previewStatus = async (value: string, setStatus: (value: boolean | undefined) => void) => {
    setStatus(undefined)
    if (!looksComplete(value)) return
    const normalized = normalizeServerUrl(value)
    if (!normalized) return
    const result = await checkServerHealth(normalized, fetcher)
    setStatus(result.healthy)
  }

  const resetAdd = () => {
    setStore("addServer", {
      url: "",
      error: "",
      showForm: false,
      status: undefined,
    })
  }

  const resetEdit = () => {
    setStore("editServer", {
      id: undefined,
      value: "",
      error: "",
      status: undefined,
      busy: false,
    })
  }

  const replaceServer = (original: string, next: string) => {
    const active = server.url
    const nextActive = active === original ? next : active

    server.add(next)
    if (nextActive) server.setActive(nextActive)
    server.remove(original)
  }

  const items = createMemo(() => {
    const current = server.url
    const list = server.list
    if (!current) return list
    if (!list.includes(current)) return [current, ...list]
    return [current, ...list.filter((x) => x !== current)]
  })

  const current = createMemo(() => items().find((x) => x === server.url) ?? items()[0])

  const sortedItems = createMemo(() => {
    const list = items()
    if (!list.length) return list
    const active = current()
    const order = new Map(list.map((url, index) => [url, index] as const))
    const rank = (value?: ServerHealth) => {
      if (value?.healthy === true) return 0
      if (value?.healthy === false) return 2
      return 1
    }
    return list.slice().sort((a, b) => {
      if (a === active) return -1
      if (b === active) return 1
      const diff = rank(store.status[a]) - rank(store.status[b])
      if (diff !== 0) return diff
      return (order.get(a) ?? 0) - (order.get(b) ?? 0)
    })
  })

  async function refreshHealth() {
    const results: Record<string, ServerHealth> = {}
    await Promise.all(
      items().map(async (url) => {
        results[url] = await checkServerHealth(url, fetcher)
      }),
    )
    setStore("status", reconcile(results))
  }

  createEffect(() => {
    items()
    refreshHealth()
    const interval = setInterval(refreshHealth, 10_000)
    onCleanup(() => clearInterval(interval))
  })

  async function select(value: string, persist?: boolean) {
    if (!persist && store.status[value]?.healthy === false) return
    dialog.close()
    if (persist) {
      server.add(value)
      navigate("/")
      return
    }
    server.setActive(value)
    navigate("/")
  }

  const handleAddChange = (value: string) => {
    if (store.addServer.adding) return
    setStore("addServer", { url: value, error: "" })
    void previewStatus(value, (next) => setStore("addServer", { status: next }))
  }

  const scrollListToBottom = () => {
    const scroll = document.querySelector<HTMLDivElement>('[data-component="list"] [data-slot="list-scroll"]')
    if (!scroll) return
    requestAnimationFrame(() => {
      scroll.scrollTop = scroll.scrollHeight
    })
  }

  const handleEditChange = (value: string) => {
    if (store.editServer.busy) return
    setStore("editServer", { value, error: "" })
    void previewStatus(value, (next) => setStore("editServer", { status: next }))
  }

  async function handleAdd(value: string) {
    if (store.addServer.adding) return
    const normalized = normalizeServerUrl(value)
    if (!normalized) {
      resetAdd()
      return
    }

    setStore("addServer", { adding: true, error: "" })

    const result = await checkServerHealth(normalized, fetcher)
    setStore("addServer", { adding: false })

    if (!result.healthy) {
      setStore("addServer", { error: language.t("dialog.server.add.error") })
      return
    }

    resetAdd()
    await select(normalized, true)
  }

  async function handleEdit(original: string, value: string) {
    if (store.editServer.busy) return
    const normalized = normalizeServerUrl(value)
    if (!normalized) {
      resetEdit()
      return
    }

    if (normalized === original) {
      resetEdit()
      return
    }

    setStore("editServer", { busy: true, error: "" })

    const result = await checkServerHealth(normalized, fetcher)
    setStore("editServer", { busy: false })

    if (!result.healthy) {
      setStore("editServer", { error: language.t("dialog.server.add.error") })
      return
    }

    replaceServer(original, normalized)

    resetEdit()
  }

  const handleAddKey = (event: KeyboardEvent) => {
    event.stopPropagation()
    if (event.key !== "Enter" || event.isComposing) return
    event.preventDefault()
    handleAdd(store.addServer.url)
  }

  const blurAdd = () => {
    if (!store.addServer.url.trim()) {
      resetAdd()
      return
    }
    handleAdd(store.addServer.url)
  }

  const handleEditKey = (event: KeyboardEvent, original: string) => {
    event.stopPropagation()
    if (event.key === "Escape") {
      event.preventDefault()
      resetEdit()
      return
    }
    if (event.key !== "Enter" || event.isComposing) return
    event.preventDefault()
    handleEdit(original, store.editServer.value)
  }

  async function handleRemove(url: string) {
    server.remove(url)
    if ((await platform.getDefaultServerUrl?.()) === url) {
      platform.setDefaultServerUrl?.(null)
    }
  }

  return (
    <Dialog title={language.t("dialog.server.title")}>
      <div class="flex flex-col gap-2">
        <List
          search={{ placeholder: language.t("dialog.server.search.placeholder"), autofocus: false }}
          noInitialSelection
          emptyMessage={language.t("dialog.server.empty")}
          items={sortedItems}
          key={(x) => x}
          onSelect={(x) => {
            if (x) select(x)
          }}
          onFilter={(value) => {
            if (value && store.addServer.showForm && !store.addServer.adding) {
              resetAdd()
            }
          }}
          divider={true}
          class="px-5 [&_[data-slot=list-search-wrapper]]:w-full [&_[data-slot=list-scroll]]:max-h-[300px] [&_[data-slot=list-scroll]]:overflow-y-auto [&_[data-slot=list-items]]:bg-surface-raised-base [&_[data-slot=list-items]]:rounded-md [&_[data-slot=list-item]]:h-14 [&_[data-slot=list-item]]:p-3 [&_[data-slot=list-item]]:!bg-transparent [&_[data-slot=list-item-add]]:px-0"
          add={
            store.addServer.showForm
              ? {
                  render: () => (
                    <AddRow
                      value={store.addServer.url}
                      placeholder={language.t("dialog.server.add.placeholder")}
                      adding={store.addServer.adding}
                      error={store.addServer.error}
                      status={store.addServer.status}
                      onChange={handleAddChange}
                      onKeyDown={handleAddKey}
                      onBlur={blurAdd}
                    />
                  ),
                }
              : undefined
          }
        >
          {(i) => {
            return (
              <div class="flex items-center gap-3 min-w-0 flex-1 group/item">
                <Show
                  when={store.editServer.id !== i}
                  fallback={
                    <EditRow
                      value={store.editServer.value}
                      placeholder={language.t("dialog.server.add.placeholder")}
                      busy={store.editServer.busy}
                      error={store.editServer.error}
                      status={store.editServer.status}
                      onChange={handleEditChange}
                      onKeyDown={(event) => handleEditKey(event, i)}
                      onBlur={() => handleEdit(i, store.editServer.value)}
                    />
                  }
                >
                  <ServerRow
                    url={i}
                    status={store.status[i]}
                    dimmed={store.status[i]?.healthy === false}
                    class="flex items-center gap-3 px-4 min-w-0 flex-1"
                    badge={
                      <Show when={defaultUrl() === i}>
                        <span class="text-text-weak bg-surface-base text-14-regular px-1.5 rounded-xs">
                          {language.t("dialog.server.status.default")}
                        </span>
                      </Show>
                    }
                  />
                </Show>
                <Show when={store.editServer.id !== i}>
                  <div class="flex items-center justify-center gap-5 pl-4">
                    <Show when={current() === i}>
                      <p class="text-text-weak text-12-regular">{language.t("dialog.server.current")}</p>
                    </Show>

                    <DropdownMenu>
                      <DropdownMenu.Trigger
                        as={IconButton}
                        icon="dot-grid"
                        variant="ghost"
                        class="shrink-0 size-8 hover:bg-surface-base-hover data-[expanded]:bg-surface-base-active"
                        onClick={(e: MouseEvent) => e.stopPropagation()}
                        onPointerDown={(e: PointerEvent) => e.stopPropagation()}
                      />
                      <DropdownMenu.Portal>
                        <DropdownMenu.Content class="mt-1">
                          <DropdownMenu.Item
                            onSelect={() => {
                              setStore("editServer", {
                                id: i,
                                value: i,
                                error: "",
                                status: store.status[i]?.healthy,
                              })
                            }}
                          >
                            <DropdownMenu.ItemLabel>{language.t("dialog.server.menu.edit")}</DropdownMenu.ItemLabel>
                          </DropdownMenu.Item>
                          <Show when={canDefault() && defaultUrl() !== i}>
                            <DropdownMenu.Item
                              onSelect={async () => {
                                try {
                                  await platform.setDefaultServerUrl?.(i)
                                  defaultUrlActions.mutate(i)
                                } catch (err) {
                                  showToast({
                                    variant: "error",
                                    title: language.t("common.requestFailed"),
                                    description: err instanceof Error ? err.message : String(err),
                                  })
                                }
                              }}
                            >
                              <DropdownMenu.ItemLabel>
                                {language.t("dialog.server.menu.default")}
                              </DropdownMenu.ItemLabel>
                            </DropdownMenu.Item>
                          </Show>
                          <Show when={canDefault() && defaultUrl() === i}>
                            <DropdownMenu.Item
                              onSelect={async () => {
                                try {
                                  await platform.setDefaultServerUrl?.(null)
                                  defaultUrlActions.mutate(null)
                                } catch (err) {
                                  showToast({
                                    variant: "error",
                                    title: language.t("common.requestFailed"),
                                    description: err instanceof Error ? err.message : String(err),
                                  })
                                }
                              }}
                            >
                              <DropdownMenu.ItemLabel>
                                {language.t("dialog.server.menu.defaultRemove")}
                              </DropdownMenu.ItemLabel>
                            </DropdownMenu.Item>
                          </Show>
                          <DropdownMenu.Separator />
                          <DropdownMenu.Item
                            onSelect={() => handleRemove(i)}
                            class="text-text-on-critical-base hover:bg-surface-critical-weak"
                          >
                            <DropdownMenu.ItemLabel>{language.t("dialog.server.menu.delete")}</DropdownMenu.ItemLabel>
                          </DropdownMenu.Item>
                        </DropdownMenu.Content>
                      </DropdownMenu.Portal>
                    </DropdownMenu>
                  </div>
                </Show>
              </div>
            )
          }}
        </List>

        <div class="px-5 pb-5">
          <Button
            variant="secondary"
            icon="plus-small"
            size="large"
            onClick={() => {
              setStore("addServer", { showForm: true, url: "", error: "" })
              scrollListToBottom()
            }}
            class="py-1.5 pl-1.5 pr-3 flex items-center gap-1.5"
          >
            {store.addServer.adding ? language.t("dialog.server.add.checking") : language.t("dialog.server.add.button")}
          </Button>
        </div>
      </div>
    </Dialog>
  )
}