import { AssistantMessage, type FileDiff, Message as MessageType, Part as PartType } from "@opencode-ai/sdk/v2/client"
import type { SessionStatus } from "@opencode-ai/sdk/v2"
import { useData } from "../context"
import { useFileComponent } from "../context/file"

import { same } from "@opencode-ai/util/array"
import { Binary } from "@opencode-ai/util/binary"
import { getDirectory, getFilename } from "@opencode-ai/util/path"
import { createEffect, createMemo, createSignal, For, on, onCleanup, ParentProps, Show } from "solid-js"
import { Dynamic } from "solid-js/web"
import { GrowBox } from "./grow-box"
import { AssistantParts, UserMessageDisplay, Part, PART_MAPPING } from "./message-part"
import { Card } from "./card"
import { Accordion } from "./accordion"
import { StickyAccordionHeader } from "./sticky-accordion-header"
import { Collapsible } from "./collapsible"
import { DiffChanges } from "./diff-changes"
import { Icon } from "./icon"
import { IconButton } from "./icon-button"
import { TextShimmer } from "./text-shimmer"
import { TextReveal } from "./text-reveal"
import { list } from "./text-utils"
import { SessionRetry } from "./session-retry"
import { Tooltip } from "./tooltip"
import { createAutoScroll } from "../hooks"
import { useI18n } from "../context/i18n"
function record(value: unknown): value is Record<string, unknown> {
  return !!value && typeof value === "object" && !Array.isArray(value)
}

function unwrap(message: string) {
  const text = message.replace(/^Error:\s*/, "").trim()

  const parse = (value: string) => {
    try {
      return JSON.parse(value) as unknown
    } catch {
      return undefined
    }
  }

  const read = (value: string) => {
    const first = parse(value)
    if (typeof first !== "string") return first
    return parse(first.trim())
  }

  let json = read(text)

  if (json === undefined) {
    const start = text.indexOf("{")
    const end = text.lastIndexOf("}")
    if (start !== -1 && end > start) {
      json = read(text.slice(start, end + 1))
    }
  }

  if (!record(json)) return message

  const err = record(json.error) ? json.error : undefined
  if (err) {
    const type = typeof err.type === "string" ? err.type : undefined
    const msg = typeof err.message === "string" ? err.message : undefined
    if (type && msg) return `${type}: ${msg}`
    if (msg) return msg
    if (type) return type
    const code = typeof err.code === "string" ? err.code : undefined
    if (code) return code
  }

  const msg = typeof json.message === "string" ? json.message : undefined
  if (msg) return msg

  const reason = typeof json.error === "string" ? json.error : undefined
  if (reason) return reason

  return message
}

const hidden = new Set(["todowrite", "todoread"])
const emptyMessages: MessageType[] = []
const emptyAssistant: AssistantMessage[] = []
const emptyDiffs: FileDiff[] = []
const idle: SessionStatus = { type: "idle" as const }
const handoffHoldMs = 120

function partState(part: PartType, showReasoningSummaries: boolean) {
  if (part.type === "tool") {
    if (hidden.has(part.tool)) return
    if (part.tool === "question" && (part.state.status === "pending" || part.state.status === "running")) return
    return "visible" as const
  }
  if (part.type === "text") return part.text?.trim() ? ("visible" as const) : undefined
  if (part.type === "reasoning") {
    if (showReasoningSummaries && part.text?.trim()) return "visible" as const
    return
  }
  if (PART_MAPPING[part.type]) return "visible" as const
  return
}

function clean(value: string) {
  return value
    .replace(/`([^`]+)`/g, "$1")
    .replace(/\[([^\]]+)\]\([^\)]+\)/g, "$1")
    .replace(/[*_~]+/g, "")
    .trim()
}

function heading(text: string) {
  const markdown = text.replace(/\r\n?/g, "\n")

  const html = markdown.match(/<h[1-6][^>]*>([\s\S]*?)<\/h[1-6]>/i)
  if (html?.[1]) {
    const value = clean(html[1].replace(/<[^>]+>/g, " "))
    if (value) return value
  }

  const atx = markdown.match(/^\s{0,3}#{1,6}[ \t]+(.+?)(?:[ \t]+#+[ \t]*)?$/m)
  if (atx?.[1]) {
    const value = clean(atx[1])
    if (value) return value
  }

  const setext = markdown.match(/^([^\n]+)\n(?:=+|-+)\s*$/m)
  if (setext?.[1]) {
    const value = clean(setext[1])
    if (value) return value
  }

  const strong = markdown.match(/^\s*(?:\*\*|__)(.+?)(?:\*\*|__)\s*$/m)
  if (strong?.[1]) {
    const value = clean(strong[1])
    if (value) return value
  }
}

export function SessionTurn(
  props: ParentProps<{
    sessionID: string
    messageID: string
    animate?: boolean
    showReasoningSummaries?: boolean
    shellToolDefaultOpen?: boolean
    editToolDefaultOpen?: boolean
    active?: boolean
    queued?: boolean
    status?: SessionStatus
    onUserInteracted?: () => void
    classes?: {
      root?: string
      content?: string
      container?: string
    }
  }>,
) {
  const data = useData()
  const i18n = useI18n()
  const fileComponent = useFileComponent()

  const emptyParts: PartType[] = []

  const allMessages = createMemo(() => list(data.store.message?.[props.sessionID], emptyMessages))

  const messageIndex = createMemo(() => {
    const messages = allMessages() ?? emptyMessages
    const result = Binary.search(messages, props.messageID, (m) => m.id)

    const index = result.found ? result.index : messages.findIndex((m) => m.id === props.messageID)
    if (index < 0) return -1

    const msg = messages[index]
    if (!msg || msg.role !== "user") return -1

    return index
  })

  const message = createMemo(() => {
    const index = messageIndex()
    if (index < 0) return undefined

    const messages = allMessages() ?? emptyMessages
    const msg = messages[index]
    if (!msg || msg.role !== "user") return undefined

    return msg
  })

  const active = createMemo(() => props.active ?? false)
  const queued = createMemo(() => props.queued ?? false)
  const parts = createMemo(() => {
    const msg = message()
    if (!msg) return emptyParts
    return list(data.store.part?.[msg.id], emptyParts)
  })

  const compaction = createMemo(() => parts().find((part) => part.type === "compaction"))

  const diffs = createMemo(() => {
    const files = message()?.summary?.diffs
    if (!files?.length) return emptyDiffs

    const seen = new Set<string>()
    return files
      .reduceRight<FileDiff[]>((result, diff) => {
        if (seen.has(diff.file)) return result
        seen.add(diff.file)
        result.push(diff)
        return result
      }, [])
      .reverse()
  })
  const edited = createMemo(() => diffs().length)
  const [open, setOpen] = createSignal(false)
  const [expanded, setExpanded] = createSignal<string[]>([])

  createEffect(
    on(
      open,
      (value, prev) => {
        if (!value && prev) setExpanded([])
      },
      { defer: true },
    ),
  )

  const assistantMessages = createMemo(
    () => {
      const msg = message()
      if (!msg) return emptyAssistant

      const messages = allMessages() ?? emptyMessages
      const index = messageIndex()
      if (index < 0) return emptyAssistant

      const result: AssistantMessage[] = []
      for (let i = index + 1; i < messages.length; i++) {
        const item = messages[i]
        if (!item) continue
        if (item.role === "user") break
        if (item.role === "assistant" && item.parentID === msg.id) result.push(item as AssistantMessage)
      }
      return result
    },
    emptyAssistant,
    { equals: same },
  )

  const interrupted = createMemo(() => assistantMessages().some((m) => m.error?.name === "MessageAbortedError"))
  const error = createMemo(
    () => assistantMessages().find((m) => m.error && m.error.name !== "MessageAbortedError")?.error,
  )
  const assistantCopyPart = createMemo(() => {
    const messages = assistantMessages()

    for (let i = messages.length - 1; i >= 0; i--) {
      const message = messages[i]
      if (!message) continue

      const parts = list(data.store.part?.[message.id], emptyParts)
      for (let j = parts.length - 1; j >= 0; j--) {
        const part = parts[j]
        if (!part || part.type !== "text") continue
        const text = part.text?.trim()
        if (!text) continue
        return {
          id: part.id,
          text,
          message,
        }
      }
    }
  })
  const assistantCopyPartID = createMemo(() => assistantCopyPart()?.id ?? null)
  const errorText = createMemo(() => {
    const msg = error()?.data?.message
    if (typeof msg === "string") return unwrap(msg)
    if (msg === undefined || msg === null) return ""
    return unwrap(String(msg))
  })

  const status = createMemo(() => data.store.session_status[props.sessionID] ?? idle)
  const working = createMemo(() => {
    if (status().type === "idle") return false
    if (!message()) return false
    return active()
  })
  const showReasoningSummaries = createMemo(() => props.showReasoningSummaries ?? true)
  const showDiffSummary = createMemo(() => edited() > 0 && !working())
  const turnDurationMs = createMemo(() => {
    const start = message()?.time.created
    if (typeof start !== "number") return undefined

    const end = assistantMessages().reduce<number | undefined>((max, item) => {
      const completed = item.time.completed
      if (typeof completed !== "number") return max
      if (max === undefined) return completed
      return Math.max(max, completed)
    }, undefined)

    if (typeof end !== "number") return undefined
    if (end < start) return undefined
    return end - start
  })
  const assistantVisible = createMemo(() =>
    assistantMessages().reduce((count, message) => {
      const parts = list(data.store.part?.[message.id], emptyParts)
      return count + parts.filter((part) => partState(part, showReasoningSummaries()) === "visible").length
    }, 0),
  )
  const assistantTailVisible = createMemo(() =>
    assistantMessages()
      .flatMap((message) => list(data.store.part?.[message.id], emptyParts))
      .flatMap((part) => {
        if (partState(part, showReasoningSummaries()) !== "visible") return []
        if (part.type === "text") return ["text" as const]
        return ["other" as const]
      })
      .at(-1),
  )
  const reasoningHeading = createMemo(() =>
    assistantMessages()
      .flatMap((message) => list(data.store.part?.[message.id], emptyParts))
      .filter((part): part is PartType & { type: "reasoning"; text: string } => part.type === "reasoning")
      .map((part) => heading(part.text))
      .filter((text): text is string => !!text)
      .at(-1),
  )
  const thinking = createMemo(() => {
    if (!working() || !!error()) return false
    if (queued()) return false
    if (status().type === "retry") return false
    if (showReasoningSummaries()) return assistantVisible() === 0
    return true
  })
  const hasAssistant = createMemo(() => assistantMessages().length > 0)
  const animateEnabled = createMemo(() => props.animate !== false)
  const [live, setLive] = createSignal(false)
  const thinkingOpen = createMemo(() => thinking() && (live() || !animateEnabled()))
  const metaOpen = createMemo(() => !working() && !!assistantCopyPart())
  const duration = createMemo(() => {
    const ms = turnDurationMs()
    if (typeof ms !== "number" || ms < 0) return ""

    const total = Math.round(ms / 1000)
    if (total < 60) return `${total}s`

    const minutes = Math.floor(total / 60)
    const seconds = total % 60
    return `${minutes}m ${seconds}s`
  })
  const meta = createMemo(() => {
    const item = assistantCopyPart()
    if (!item) return ""

    const agent = item.message.agent ? item.message.agent[0]?.toUpperCase() + item.message.agent.slice(1) : ""
    const model = item.message.modelID
      ? (data.store.provider?.all?.find((provider) => provider.id === item.message.providerID)?.models?.[
          item.message.modelID
        ]?.name ?? item.message.modelID)
      : ""
    return [agent, model, duration()].filter((value) => !!value).join("\u00A0\u00B7\u00A0")
  })
  const [copied, setCopied] = createSignal(false)
  const [handoffHold, setHandoffHold] = createSignal(false)
  const thinkingVisible = createMemo(() => thinkingOpen() || handoffHold())
  const handoffOpen = createMemo(() => thinkingVisible() || metaOpen())
  const lane = createMemo(() => hasAssistant() || handoffOpen())

  let liveFrame: number | undefined
  let copiedTimer: ReturnType<typeof setTimeout> | undefined
  let handoffTimer: ReturnType<typeof setTimeout> | undefined

  const copyAssistant = async () => {
    const text = assistantCopyPart()?.text
    if (!text) return

    await navigator.clipboard.writeText(text)
    setCopied(true)
    if (copiedTimer !== undefined) clearTimeout(copiedTimer)
    copiedTimer = setTimeout(() => {
      copiedTimer = undefined
      setCopied(false)
    }, 2000)
  }

  createEffect(
    on(
      () => [animateEnabled(), working()] as const,
      ([enabled, isWorking]) => {
        if (liveFrame !== undefined) {
          cancelAnimationFrame(liveFrame)
          liveFrame = undefined
        }
        if (!enabled || !isWorking || live()) return
        liveFrame = requestAnimationFrame(() => {
          liveFrame = undefined
          setLive(true)
        })
      },
    ),
  )

  createEffect(
    on(
      () => [thinkingOpen(), metaOpen()] as const,
      ([thinkingNow, metaNow]) => {
        if (handoffTimer !== undefined) {
          clearTimeout(handoffTimer)
          handoffTimer = undefined
        }

        if (thinkingNow) {
          setHandoffHold(true)
          return
        }

        if (metaNow) {
          setHandoffHold(false)
          return
        }

        if (!handoffHold()) return
        handoffTimer = setTimeout(() => {
          handoffTimer = undefined
          setHandoffHold(false)
        }, handoffHoldMs)
      },
      { defer: true },
    ),
  )

  const autoScroll = createAutoScroll({
    working,
    onUserInteracted: props.onUserInteracted,
    overflowAnchor: "dynamic",
  })

  onCleanup(() => {
    if (liveFrame !== undefined) cancelAnimationFrame(liveFrame)
    if (copiedTimer !== undefined) clearTimeout(copiedTimer)
    if (handoffTimer !== undefined) clearTimeout(handoffTimer)
  })

  const turnDiffSummary = () => (
    <div data-slot="session-turn-diffs">
      <Collapsible open={open()} onOpenChange={setOpen} variant="ghost">
        <Collapsible.Trigger>
          <div data-component="session-turn-diffs-trigger">
            <div data-slot="session-turn-diffs-title">
              <span data-slot="session-turn-diffs-label">{i18n.t("ui.sessionReview.change.modified")}</span>
              <span data-slot="session-turn-diffs-count">
                {edited()} {i18n.t(edited() === 1 ? "ui.common.file.one" : "ui.common.file.other")}
              </span>
              <div data-slot="session-turn-diffs-meta">
                <DiffChanges changes={diffs()} variant="bars" />
                <Collapsible.Arrow />
              </div>
            </div>
          </div>
        </Collapsible.Trigger>
        <Collapsible.Content>
          <Show when={open()}>
            <div data-component="session-turn-diffs-content">
              <Accordion
                multiple
                style={{ "--sticky-accordion-offset": "37px" }}
                value={expanded()}
                onChange={(value) => setExpanded(Array.isArray(value) ? value : value ? [value] : [])}
              >
                <For each={diffs()}>
                  {(diff) => {
                    const active = createMemo(() => expanded().includes(diff.file))
                    const [visible, setVisible] = createSignal(false)

                    createEffect(
                      on(
                        active,
                        (value) => {
                          if (!value) {
                            setVisible(false)
                            return
                          }

                          requestAnimationFrame(() => {
                            if (!active()) return
                            setVisible(true)
                          })
                        },
                        { defer: true },
                      ),
                    )

                    return (
                      <Accordion.Item value={diff.file}>
                        <StickyAccordionHeader>
                          <Accordion.Trigger>
                            <div data-slot="session-turn-diff-trigger">
                              <span data-slot="session-turn-diff-path">
                                <Show when={diff.file.includes("/")}>
                                  <span data-slot="session-turn-diff-directory">{`\u202A${getDirectory(diff.file)}\u202C`}</span>
                                </Show>
                                <span data-slot="session-turn-diff-filename">{getFilename(diff.file)}</span>
                              </span>
                              <div data-slot="session-turn-diff-meta">
                                <span data-slot="session-turn-diff-changes">
                                  <DiffChanges changes={diff} />
                                </span>
                                <span data-slot="session-turn-diff-chevron">
                                  <Icon name="chevron-down" size="small" />
                                </span>
                              </div>
                            </div>
                          </Accordion.Trigger>
                        </StickyAccordionHeader>
                        <Accordion.Content>
                          <Show when={visible()}>
                            <div data-slot="session-turn-diff-view" data-scrollable>
                              <Dynamic
                                component={fileComponent}
                                mode="diff"
                                before={{ name: diff.file, contents: diff.before }}
                                after={{ name: diff.file, contents: diff.after }}
                              />
                            </div>
                          </Show>
                        </Accordion.Content>
                      </Accordion.Item>
                    )
                  }}
                </For>
              </Accordion>
            </div>
          </Show>
        </Collapsible.Content>
      </Collapsible>
    </div>
  )

  const divider = (label: string) => (
    <div data-component="compaction-part">
      <div data-slot="compaction-part-divider">
        <span data-slot="compaction-part-line" />
        <span data-slot="compaction-part-label" class="text-12-regular text-text-weak">
          {label}
        </span>
        <span data-slot="compaction-part-line" />
      </div>
    </div>
  )

  return (
    <div data-component="session-turn" class={props.classes?.root}>
      <div
        ref={autoScroll.scrollRef}
        onScroll={autoScroll.handleScroll}
        data-slot="session-turn-content"
        class={props.classes?.content}
      >
        <div onClick={autoScroll.handleInteraction}>
          <Show when={message()}>
            {(msg) => (
              <div
                ref={autoScroll.contentRef}
                data-message={msg().id}
                data-slot="session-turn-message-container"
                class={props.classes?.container}
              >
                <div data-slot="session-turn-message-content" aria-live="off">
                  <UserMessageDisplay
                    message={msg()}
                    parts={parts()}
                    interrupted={interrupted()}
                    animate={props.animate}
                    queued={queued()}
                  />
                </div>
                <Show when={compaction()}>
                  {(part) => (
                    <GrowBox animate={props.animate !== false} fade gap={8} class="w-full min-w-0">
                      <div data-slot="session-turn-compaction">
                        <Part part={part()} message={msg()} hideDetails />
                      </div>
                    </GrowBox>
                  )}
                </Show>
                <div data-slot="session-turn-assistant-lane" aria-hidden={!lane()}>
                  <Show when={hasAssistant()}>
                    <div
                      data-slot="session-turn-assistant-content"
                      aria-hidden={working()}
                      style={{ contain: "layout paint" }}
                    >
                      <AssistantParts
                        messages={assistantMessages()}
                        showAssistantCopyPartID={assistantCopyPartID()}
                        showTurnDiffSummary={showDiffSummary()}
                        turnDiffSummary={turnDiffSummary}
                        working={working()}
                        animate={live()}
                        showReasoningSummaries={showReasoningSummaries()}
                        shellToolDefaultOpen={props.shellToolDefaultOpen}
                        editToolDefaultOpen={props.editToolDefaultOpen}
                      />
                    </div>
                  </Show>
                  <GrowBox
                    animate={live()}
                    animateToggle={live()}
                    open={handoffOpen()}
                    fade
                    slot="session-turn-handoff-wrap"
                  >
                    <div data-slot="session-turn-handoff">
                      <div data-slot="session-turn-thinking" data-visible={thinkingVisible() ? "true" : "false"}>
                        <TextShimmer text={i18n.t("ui.sessionTurn.status.thinking")} />
                        <TextReveal
                          text={!showReasoningSummaries() ? (reasoningHeading() ?? "") : ""}
                          class="session-turn-thinking-heading"
                          travel={25}
                          duration={900}
                        />
                      </div>
                      <Show when={metaOpen()}>
                        <div
                          data-slot="session-turn-meta"
                          data-visible={thinkingVisible() ? "false" : "true"}
                          data-interrupted={interrupted() ? "" : undefined}
                        >
                          <Tooltip
                            value={copied() ? i18n.t("ui.message.copied") : i18n.t("ui.message.copyResponse")}
                            placement="top"
                            gutter={4}
                          >
                            <IconButton
                              icon={copied() ? "check" : "copy"}
                              size="normal"
                              variant="ghost"
                              onMouseDown={(event) => event.preventDefault()}
                              onClick={() => void copyAssistant()}
                              aria-label={copied() ? i18n.t("ui.message.copied") : i18n.t("ui.message.copyResponse")}
                            />
                          </Tooltip>
                          <Show when={meta()}>
                            <span
                              data-slot="session-turn-meta-label"
                              class="text-12-regular text-text-weak cursor-default"
                            >
                              {meta()}
                            </span>
                          </Show>
                        </div>
                      </Show>
                    </div>
                  </GrowBox>
                </div>
                <GrowBox animate={props.animate !== false} fade gap={0} open={interrupted()} class="w-full min-w-0">
                  {divider(i18n.t("ui.message.interrupted"))}
                </GrowBox>
                <SessionRetry status={status()} show={active()} />
                <GrowBox
                  animate={props.animate !== false}
                  fade
                  gap={0}
                  open={showDiffSummary() && !assistantCopyPartID()}
                >
                  {turnDiffSummary()}
                </GrowBox>
                <Show when={error()}>
                  <Card variant="error" class="error-card">
                    {errorText()}
                  </Card>
                </Show>
              </div>
            )}
          </Show>
          {props.children}
        </div>
      </div>
    </div>
  )
}