import { Accordion } from "./accordion"
import { Button } from "./button"
import { RadioGroup } from "./radio-group"
import { DiffChanges } from "./diff-changes"
import { FileIcon } from "./file-icon"
import { Icon } from "./icon"
import { StickyAccordionHeader } from "./sticky-accordion-header"
import { useCodeComponent } from "../context/code"
import { useDiffComponent } from "../context/diff"
import { useI18n } from "../context/i18n"
import { checksum } from "@opencode-ai/util/encode"
import { getDirectory, getFilename } from "@opencode-ai/util/path"
import { createEffect, createSignal, For, Match, Show, Switch, type JSX } from "solid-js"
import { createStore } from "solid-js/store"
import { type FileContent, type FileDiff } from "@opencode-ai/sdk/v2"
import { PreloadMultiFileDiffResult } from "@pierre/diffs/ssr"
import { Dynamic } from "solid-js/web"

export type SessionReviewDiffStyle = "unified" | "split"

export interface SessionReviewProps {
  split?: boolean
  diffStyle?: SessionReviewDiffStyle
  onDiffStyleChange?: (diffStyle: SessionReviewDiffStyle) => void
  open?: string[]
  onOpenChange?: (open: string[]) => void
  scrollRef?: (el: HTMLDivElement) => void
  onScroll?: JSX.EventHandlerUnion<HTMLDivElement, Event>
  class?: string
  classList?: Record<string, boolean | undefined>
  classes?: { root?: string; header?: string; container?: string }
  actions?: JSX.Element
  diffs: (FileDiff & { preloaded?: PreloadMultiFileDiffResult<any> })[]
  onViewFile?: (file: string) => void
  readFile?: (path: string) => Promise<FileContent | undefined>
}

const imageExtensions = new Set(["png", "jpg", "jpeg", "gif", "webp", "avif", "bmp", "ico", "tif", "tiff", "heic"])
const audioExtensions = new Set(["mp3", "wav", "ogg", "m4a", "aac", "flac", "opus"])

function normalizeMimeType(type: string | undefined): string | undefined {
  if (!type) return

  const mime = type.split(";", 1)[0]?.trim().toLowerCase()
  if (!mime) return

  if (mime === "audio/x-aac") return "audio/aac"
  if (mime === "audio/x-m4a") return "audio/mp4"

  return mime
}

function getExtension(file: string): string {
  const idx = file.lastIndexOf(".")
  if (idx === -1) return ""
  return file.slice(idx + 1).toLowerCase()
}

function isImageFile(file: string): boolean {
  return imageExtensions.has(getExtension(file))
}

function isAudioFile(file: string): boolean {
  return audioExtensions.has(getExtension(file))
}

function dataUrl(content: FileContent | undefined): string | undefined {
  if (!content) return
  if (content.encoding !== "base64") return
  const mime = normalizeMimeType(content.mimeType)
  if (!mime) return
  if (!mime.startsWith("image/") && !mime.startsWith("audio/")) return
  return `data:${mime};base64,${content.content}`
}

function dataUrlFromValue(value: unknown): string | undefined {
  if (typeof value === "string") {
    if (value.startsWith("data:image/")) return value
    if (value.startsWith("data:audio/x-aac;")) return value.replace("data:audio/x-aac;", "data:audio/aac;")
    if (value.startsWith("data:audio/x-m4a;")) return value.replace("data:audio/x-m4a;", "data:audio/mp4;")
    if (value.startsWith("data:audio/")) return value
    return
  }
  if (!value || typeof value !== "object") return

  const content = (value as { content?: unknown }).content
  const encoding = (value as { encoding?: unknown }).encoding
  const mimeType = (value as { mimeType?: unknown }).mimeType

  if (typeof content !== "string") return
  if (encoding !== "base64") return
  if (typeof mimeType !== "string") return
  const mime = normalizeMimeType(mimeType)
  if (!mime) return
  if (!mime.startsWith("image/") && !mime.startsWith("audio/")) return

  return `data:${mime};base64,${content}`
}

export const SessionReview = (props: SessionReviewProps) => {
  const i18n = useI18n()
  const diffComponent = useDiffComponent()
  const codeComponent = useCodeComponent()
  const [store, setStore] = createStore({
    open: props.diffs.length > 10 ? [] : props.diffs.map((d) => d.file),
  })

  const open = () => props.open ?? store.open
  const diffStyle = () => props.diffStyle ?? (props.split ? "split" : "unified")

  const handleChange = (open: string[]) => {
    props.onOpenChange?.(open)
    if (props.open !== undefined) return
    setStore("open", open)
  }

  const handleExpandOrCollapseAll = () => {
    const next = open().length > 0 ? [] : props.diffs.map((d) => d.file)
    handleChange(next)
  }

  return (
    <div
      data-component="session-review"
      ref={props.scrollRef}
      onScroll={props.onScroll}
      classList={{
        ...(props.classList ?? {}),
        [props.classes?.root ?? ""]: !!props.classes?.root,
        [props.class ?? ""]: !!props.class,
      }}
    >
      <div
        data-slot="session-review-header"
        classList={{
          [props.classes?.header ?? ""]: !!props.classes?.header,
        }}
      >
        <div data-slot="session-review-title">{i18n.t("ui.sessionReview.title")}</div>
        <div data-slot="session-review-actions">
          <Show when={props.onDiffStyleChange}>
            <RadioGroup
              options={["unified", "split"] as const}
              current={diffStyle()}
              value={(style) => style}
              label={(style) =>
                i18n.t(style === "unified" ? "ui.sessionReview.diffStyle.unified" : "ui.sessionReview.diffStyle.split")
              }
              onSelect={(style) => style && props.onDiffStyleChange?.(style)}
            />
          </Show>
          <Button size="normal" icon="chevron-grabber-vertical" onClick={handleExpandOrCollapseAll}>
            <Switch>
              <Match when={open().length > 0}>{i18n.t("ui.sessionReview.collapseAll")}</Match>
              <Match when={true}>{i18n.t("ui.sessionReview.expandAll")}</Match>
            </Switch>
          </Button>
          {props.actions}
        </div>
      </div>
      <div
        data-slot="session-review-container"
        classList={{
          [props.classes?.container ?? ""]: !!props.classes?.container,
        }}
      >
        <Accordion multiple value={open()} onChange={handleChange}>
          <For each={props.diffs}>
            {(diff) => {
              const beforeText = () => (typeof diff.before === "string" ? diff.before : "")
              const afterText = () => (typeof diff.after === "string" ? diff.after : "")

              const isAdded = () => beforeText().length === 0 && afterText().length > 0
              const isDeleted = () => afterText().length === 0 && beforeText().length > 0
              const isImage = () => isImageFile(diff.file)
              const isAudio = () => isAudioFile(diff.file)

              const diffImageSrc = dataUrlFromValue(diff.after) ?? dataUrlFromValue(diff.before)
              const [imageSrc, setImageSrc] = createSignal<string | undefined>(diffImageSrc)
              const [imageStatus, setImageStatus] = createSignal<"idle" | "loading" | "error">("idle")

              const diffAudioSrc = dataUrlFromValue(diff.after) ?? dataUrlFromValue(diff.before)
              const [audioSrc, setAudioSrc] = createSignal<string | undefined>(diffAudioSrc)
              const [audioStatus, setAudioStatus] = createSignal<"idle" | "loading" | "error">("idle")
              const [audioMime, setAudioMime] = createSignal<string | undefined>(undefined)

              createEffect(() => {
                if (!open().includes(diff.file)) return
                if (!isImage()) return
                if (imageSrc()) return
                if (imageStatus() !== "idle") return

                const reader = props.readFile
                if (!reader) return

                setImageStatus("loading")
                reader(diff.file)
                  .then((result) => {
                    const src = dataUrl(result)
                    if (!src) {
                      setImageStatus("error")
                      return
                    }
                    setImageSrc(src)
                    setImageStatus("idle")
                  })
                  .catch(() => {
                    setImageStatus("error")
                  })
              })

              createEffect(() => {
                if (!open().includes(diff.file)) return
                if (!isAudio()) return
                if (audioSrc()) return
                if (audioStatus() !== "idle") return

                const reader = props.readFile
                if (!reader) return

                setAudioStatus("loading")
                reader(diff.file)
                  .then((result) => {
                    const src = dataUrl(result)
                    if (!src) {
                      setAudioStatus("error")
                      return
                    }
                    setAudioMime(normalizeMimeType(result?.mimeType))
                    setAudioSrc(src)
                    setAudioStatus("idle")
                  })
                  .catch(() => {
                    setAudioStatus("error")
                  })
              })

              const fileForCode = () => {
                const contents = afterText() || beforeText()
                return {
                  name: diff.file,
                  contents,
                  cacheKey: checksum(contents),
                }
              }

              return (
                <Accordion.Item value={diff.file} data-slot="session-review-accordion-item">
                  <StickyAccordionHeader>
                    <Accordion.Trigger>
                      <div data-slot="session-review-trigger-content">
                        <div data-slot="session-review-file-info">
                          <FileIcon node={{ path: diff.file, type: "file" }} />
                          <div data-slot="session-review-file-name-container">
                            <Show when={diff.file.includes("/")}>
                              <span data-slot="session-review-directory">{`\u202A${getDirectory(diff.file)}\u202C`}</span>
                            </Show>
                            <span data-slot="session-review-filename">{getFilename(diff.file)}</span>
                            <Show when={props.onViewFile}>
                              <button
                                data-slot="session-review-view-button"
                                type="button"
                                onClick={(e) => {
                                  e.stopPropagation()
                                  props.onViewFile?.(diff.file)
                                }}
                              >
                                <Icon name="eye" size="small" />
                              </button>
                            </Show>
                          </div>
                        </div>
                        <div data-slot="session-review-trigger-actions">
                          <Switch>
                            <Match when={isAdded()}>
                              <span data-slot="session-review-change" data-type="added">
                                Added
                              </span>
                            </Match>
                            <Match when={isDeleted()}>
                              <span data-slot="session-review-change" data-type="removed">
                                Removed
                              </span>
                            </Match>
                            <Match when={true}>
                              <DiffChanges changes={diff} />
                            </Match>
                          </Switch>
                          <Icon name="chevron-grabber-vertical" size="small" />
                        </div>
                      </div>
                    </Accordion.Trigger>
                  </StickyAccordionHeader>
                  <Accordion.Content data-slot="session-review-accordion-content">
                    <Switch>
                      <Match when={isImage()}>
                        <div data-slot="session-review-image-container">
                          <Show
                            when={imageSrc()}
                            fallback={
                              <div data-slot="session-review-image-placeholder">
                                <Switch>
                                  <Match when={imageStatus() === "loading"}>Loading image...</Match>
                                  <Match when={true}>Image preview unavailable</Match>
                                </Switch>
                              </div>
                            }
                          >
                            <img data-slot="session-review-image" src={imageSrc()!} alt={getFilename(diff.file)} />
                          </Show>
                        </div>
                      </Match>
                      <Match when={isAudio()}>
                        <div data-slot="session-review-audio-container">
                          <Show
                            when={audioSrc() && audioStatus() !== "error"}
                            fallback={
                              <div data-slot="session-review-audio-placeholder">
                                <Switch>
                                  <Match when={audioStatus() === "loading"}>Loading audio...</Match>
                                  <Match when={true}>Audio preview unavailable</Match>
                                </Switch>
                              </div>
                            }
                          >
                            <audio
                              data-slot="session-review-audio"
                              controls
                              preload="metadata"
                              onError={() => {
                                setAudioStatus("error")
                              }}
                            >
                              <source src={audioSrc()!} type={audioMime()} />
                            </audio>
                          </Show>
                        </div>
                      </Match>
                      <Match when={isAdded() || isDeleted()}>
                        <div data-slot="session-review-file-container">
                          <Dynamic component={codeComponent} file={fileForCode()} overflow="scroll" />
                        </div>
                      </Match>
                      <Match when={true}>
                        <Dynamic
                          component={diffComponent}
                          preloadedDiff={diff.preloaded}
                          diffStyle={diffStyle()}
                          before={{
                            name: diff.file!,
                            contents: beforeText(),
                          }}
                          after={{
                            name: diff.file!,
                            contents: afterText(),
                          }}
                        />
                      </Match>
                    </Switch>
                  </Accordion.Content>
                </Accordion.Item>
              )
            }}
          </For>
        </Accordion>
      </div>
    </div>
  )
}