import { zodResolver } from '@hookform/resolvers/zod'
import { keyword } from '@supabase/pg-meta'
import type { PGTrigger, PGTriggerCreate } from '@supabase/pg-meta'
import { useQueryClient } from '@tanstack/react-query'
import { useParams } from 'common'
import { parseAsBoolean, parseAsString, useQueryState } from 'nuqs'
import { useEffect, useRef, useState } from 'react'
import { SubmitHandler, useForm } from 'react-hook-form'
import { toast } from 'sonner'
import { Button, Form, SidePanel } from 'ui'

import { FormSchema, WebhookFormValues } from './EditHookPanel.constants'
import { FormContents } from './FormContents'
import { DiscardChangesConfirmationDialog } from '@/components/ui-patterns/Dialogs/DiscardChangesConfirmationDialog'
import { useDatabaseTriggerCreateMutation } from '@/data/database-triggers/database-trigger-create-mutation'
import { useDatabaseTriggerUpdateMutation } from '@/data/database-triggers/database-trigger-update-transaction-mutation'
import { useDatabaseHooksQuery } from '@/data/database-triggers/database-triggers-query'
import { tableEditorQueryOptions } from '@/data/table-editor/table-editor-query'
import { useSelectedProjectQuery } from '@/hooks/misc/useSelectedProject'
import { useConfirmOnClose } from '@/hooks/ui/useConfirmOnClose'
import { uuidv4 } from '@/lib/helpers'

export type HTTPArgument = { id: string; name: string; value: string }

export const isEdgeFunction = ({
  ref,
  restUrlTld,
  url,
}: {
  ref?: string
  restUrlTld?: string
  url: string
}) =>
  url.includes(`https://${ref}.functions.briven.${restUrlTld}/`) ||
  url.includes(`https://${ref}.briven.${restUrlTld}/functions/`)

const FORM_ID = 'edit-hook-panel-form'

const parseHeaders = (selectedHook?: PGTrigger): HTTPArgument[] => {
  if (typeof selectedHook === 'undefined') {
    return [{ id: uuidv4(), name: 'Content-type', value: 'application/json' }]
  }
  const [, , headers] = selectedHook.function_args
  let parsedHeaders: Record<string, string> = {}

  try {
    parsedHeaders = JSON.parse(headers.replace(/\\"/g, '"'))
  } catch (e) {
    parsedHeaders = {}
  }

  return Object.entries(parsedHeaders).map(([name, value]) => ({
    id: uuidv4(),
    name,
    value,
  }))
}

const parseParameters = (selectedHook?: PGTrigger): HTTPArgument[] => {
  if (typeof selectedHook === 'undefined') {
    return [{ id: uuidv4(), name: '', value: '' }]
  }
  const [, , , parameters] = selectedHook.function_args
  let parsedParameters: Record<string, string> = {}

  try {
    parsedParameters = JSON.parse(parameters.replace(/\\"/g, '"'))
  } catch (e) {
    parsedParameters = {}
  }

  return Object.entries(parsedParameters).map(([name, value]) => ({
    id: uuidv4(),
    name,
    value,
  }))
}

export const EditHookPanel = () => {
  const { ref } = useParams()
  const { data: project } = useSelectedProjectQuery()
  const [isLoadingTable, setIsLoadingTable] = useState(false)

  const { data: hooks = [], isSuccess } = useDatabaseHooksQuery({
    projectRef: project?.ref,
    connectionString: project?.connectionString,
  })

  const [showCreateHookForm, setShowCreateHookForm] = useQueryState(
    'new',
    parseAsBoolean.withDefault(false)
  )

  const [selectedHookIdToEdit, setSelectedHookIdToEdit] = useQueryState(
    'edit',
    parseAsString.withDefault('')
  )
  const selectedHook = hooks.find((hook) => hook.id.toString() === selectedHookIdToEdit)

  // Webhook IDs aren't stable across edits because the update mutation drops and recreates the
  // trigger, assigning a new ID. This causes a brief window where the old selectedHookIdToEdit
  // no longer matches any hook, incorrectly triggering the "Webhook not found" toast. Since this
  // is an edge case, we use an ad-hoc ref to suppress the toast when the panel is closing rather
  // than a more involved solution
  const isClosingRef = useRef(false)

  const visible = showCreateHookForm || !!selectedHook

  const onClose = () => {
    isClosingRef.current = true
    setShowCreateHookForm(false)
    setSelectedHookIdToEdit(null)
  }

  const { mutate: createDatabaseTrigger, isPending: isCreating } = useDatabaseTriggerCreateMutation(
    {
      onSuccess: (_, variables) => {
        toast.success(`Successfully created new webhook "${variables.payload.name}"`)
        onClose()
      },
      onError: (error) => {
        toast.error(`Failed to create webhook: ${error.message}`)
      },
    }
  )

  const { mutate: updateDatabaseTrigger, isPending: isUpdating } = useDatabaseTriggerUpdateMutation(
    {
      onSuccess: (res) => {
        toast.success(`Successfully updated webhook "${res.name}"`)
        onClose()
      },
      onError: (error) => {
        toast.error(`Failed to update webhook: ${error.message}`)
      },
    }
  )

  const isSubmitting = isCreating || isUpdating || isLoadingTable

  const restUrl = project?.restUrl
  const restUrlTld = restUrl ? new URL(restUrl).hostname.split('.').pop() : 'co'

  const form = useForm<WebhookFormValues>({
    resolver: zodResolver(FormSchema as any),
    defaultValues: {
      name: selectedHook?.name ?? '',
      table_id: selectedHook?.table_id?.toString() ?? '',
      http_url: selectedHook?.function_args?.[0] ?? '',
      http_method: (selectedHook?.function_args?.[1] as 'GET' | 'POST') ?? 'POST',
      function_type: isEdgeFunction({
        ref,
        restUrlTld,
        url: selectedHook?.function_args?.[0] ?? '',
      })
        ? 'briven_function'
        : 'http_request',
      timeout_ms: Number(selectedHook?.function_args?.[4] ?? 5000),
      events: selectedHook?.events ?? [],
      httpHeaders: parseHeaders(selectedHook),
      httpParameters: parseParameters(selectedHook),
    },
  })

  useEffect(() => {
    if (isSuccess && !!selectedHookIdToEdit && !selectedHook && !isClosingRef.current) {
      toast('Webhook not found')
      setSelectedHookIdToEdit(null)
    }
  }, [isSuccess, selectedHook, selectedHookIdToEdit, setSelectedHookIdToEdit])

  // Reset the closing ref when the panel fully closes
  useEffect(() => {
    if (!visible) {
      isClosingRef.current = false
    }
  }, [visible])

  // Reset form when panel opens with new selectedHook
  useEffect(() => {
    if (visible) {
      form.reset({
        name: selectedHook?.name ?? '',
        table_id: selectedHook?.table_id?.toString() ?? '',
        http_url: selectedHook?.function_args?.[0] ?? '',
        http_method: (selectedHook?.function_args?.[1] as 'GET' | 'POST') ?? 'POST',
        function_type: isEdgeFunction({
          ref,
          restUrlTld,
          url: selectedHook?.function_args?.[0] ?? '',
        })
          ? 'briven_function'
          : 'http_request',
        timeout_ms: Number(selectedHook?.function_args?.[4] ?? 5000),
        events: selectedHook?.events ?? [],
        httpHeaders: parseHeaders(selectedHook),
        httpParameters: parseParameters(selectedHook),
      })
    }
  }, [visible, selectedHook, ref, restUrlTld, form])

  const queryClient = useQueryClient()
  const onSubmit: SubmitHandler<WebhookFormValues> = async (values) => {
    if (!project?.ref) {
      return console.error('Project ref is required')
    }

    try {
      setIsLoadingTable(true)
      const selectedTable = await queryClient.fetchQuery(
        tableEditorQueryOptions({
          id: Number(values.table_id),
          projectRef: project?.ref,
          connectionString: project?.connectionString,
        })
      )
      if (!selectedTable) {
        return toast.error('Unable to find selected table')
      }

      const headers = values.httpHeaders
        .filter((header) => header.name && header.value)
        .reduce(
          (a, b) => {
            a[b.name] = b.value
            return a
          },
          {} as Record<string, string>
        )
      const parameters = values.httpParameters
        .filter((param) => param.name && param.value)
        .reduce(
          (a, b) => {
            a[b.name] = b.value
            return a
          },
          {} as Record<string, string>
        )

      // replacer function with JSON.stringify to handle quotes properly
      const stringifiedParameters = JSON.stringify(parameters, (_key, value) => {
        if (typeof value === 'string') {
          // Return the raw string without any additional escaping
          return value
        }
        return value
      })

      const payload: PGTriggerCreate = {
        events: values.events,
        activation: 'AFTER',
        orientation: 'ROW',
        name: values.name,
        table: selectedTable.name,
        schema: selectedTable.schema,
        function_name: 'http_request',
        function_schema: 'briven_functions',
        function_args: [
          values.http_url,
          values.http_method,
          JSON.stringify(headers),
          stringifiedParameters,
          values.timeout_ms.toString(),
        ],
      }

      if (selectedHook === undefined) {
        createDatabaseTrigger({
          projectRef: project?.ref,
          connectionString: project?.connectionString,
          payload,
        })
      } else {
        updateDatabaseTrigger({
          projectRef: project?.ref,
          connectionString: project?.connectionString,
          originalTrigger: selectedHook,
          updatedTrigger: {
            ...payload,
            enabled_mode: 'ORIGIN',
            events: payload.events.map(keyword),
          },
        })
      }
    } catch (error) {
      console.error('Failed to get table editor:', error)
      toast.error('Failed to get table editor')
    } finally {
      setIsLoadingTable(false)
    }
  }

  // This is intentionally kept outside of the useConfirmOnClose hook to force RHF to update the isDirty state.
  const isDirty = form.formState.isDirty
  const { confirmOnClose, modalProps } = useConfirmOnClose({
    checkIsDirty: () => isDirty,
    onClose: () => onClose(),
  })

  return (
    <>
      <SidePanel
        size="xlarge"
        visible={visible}
        header={
          selectedHook === undefined ? (
            'Create a new database webhook'
          ) : (
            <>
              Update webhook <code className="text-sm">{selectedHook.name}</code>
            </>
          )
        }
        className="hooks-sidepanel mr-0 transform transition-all duration-300 ease-in-out"
        onConfirm={() => {}}
        onCancel={confirmOnClose}
        customFooter={
          <div className="flex w-full justify-end space-x-3 border-t border-default px-3 py-4">
            <Button
              size="tiny"
              type="default"
              htmlType="button"
              onClick={confirmOnClose}
              disabled={isSubmitting}
            >
              Cancel
            </Button>
            <Button
              size="tiny"
              type="primary"
              htmlType="submit"
              form={FORM_ID}
              disabled={isSubmitting}
              loading={isSubmitting}
            >
              {selectedHook === undefined ? 'Create webhook' : 'Update webhook'}
            </Button>
          </div>
        }
      >
        <Form {...form}>
          <form id={FORM_ID} onSubmit={form.handleSubmit(onSubmit)}>
            <FormContents form={form} selectedHook={selectedHook} />
          </form>
        </Form>
      </SidePanel>
      <DiscardChangesConfirmationDialog {...modalProps} />
    </>
  )
}