import type {
  Message,
  Agent,
  Provider,
  Session,
  Part,
  Config,
  Todo,
  Command,
  PermissionRequest,
  QuestionRequest,
  SuggestionRequest, 
  SessionNetworkWait, 
  LspStatus,
  McpStatus,
  McpResource,
  FormatterStatus,
  SessionStatus,
  ProviderListResponse,
  ProviderAuthMethod,
  VcsInfo,
} from "@saeeol/sdk/v2"
import { createStore, produce, reconcile } from "solid-js/store"
import { useProject } from "@tui/context/project"
import { useEvent } from "@tui/context/event"
import { useSDK } from "@tui/context/sdk"
import { Binary } from "@saeeol/core/util/binary"
import { createSimpleContext } from "./helper"
import type { Snapshot } from "@/snapshot"
import { useExit } from "../runtime/exit"
import { useArgs } from "./args"
import { batch, createEffect, on, onMount } from "solid-js" 
import { handleSuggestionEvent } from "@/saeeol/suggestion/tui/sync" 
import { useToast } from "@tui/ui/toast" 
import * as Log from "@saeeol/core/util/log"
import { emptyConsoleState, type ConsoleState } from "@/config/console-state"
import type { IndexingStatus } from "@saeeol/indexing/status" 
import { SaeeolIndexing } from "@/saeeol/indexing" 
import path from "path"
import { useKV } from "../runtime/kv"

export const { use: useSync, provider: SyncProvider } = createSimpleContext({
  name: "Sync",
  init: () => {
    const [store, setStore] = createStore<{
      status: "loading" | "partial" | "complete"
      provider: Provider[]
      provider_default: Record<string, string>
      provider_next: ProviderListResponse
      console_state: ConsoleState
      provider_auth: Record<string, ProviderAuthMethod[]>
      agent: Agent[]
      command: Command[]
      permission: {
        [sessionID: string]: PermissionRequest[]
      }
      question: {
        [sessionID: string]: QuestionRequest[]
      }
      suggestion: {
        [sessionID: string]: SuggestionRequest[]
      }
      network: {
        [sessionID: string]: SessionNetworkWait[]
      }
      config: Config
      globalConfig: Config 
      session: Session[]
      session_status: {
        [sessionID: string]: SessionStatus
      }
      session_diff: {
        [sessionID: string]: Omit<Snapshot.FileDiff, "before" | "after">[] 
      }
      todo: {
        [sessionID: string]: Todo[]
      }
      message: {
        [sessionID: string]: Message[]
      }
      part: {
        [messageID: string]: Part[]
      }
      lsp: LspStatus[]
      mcp: {
        [key: string]: McpStatus
      }
      mcp_resource: {
        [key: string]: McpResource
      }
      formatter: FormatterStatus[]
      vcs: VcsInfo | undefined
      indexing: IndexingStatus 
    }>({
      provider_next: {
        all: [],
        default: {},
        connected: [],
        failed: [], 
      },
      console_state: emptyConsoleState,
      provider_auth: {},
      config: {},
      globalConfig: {}, 
      status: "loading",
      agent: [],
      permission: {},
      question: {},
      suggestion: {},
      network: {},
      command: [],
      provider: [],
      provider_default: {},
      session: [],
      session_status: {},
      session_diff: {},
      todo: {},
      message: {},
      part: {},
      lsp: [],
      mcp: {},
      mcp_resource: {},
      formatter: [],
      vcs: undefined,
      indexing: { state: "Disabled", message: "Indexing disabled.", processedFiles: 0, totalFiles: 0, percent: 0 }, 
    })

    const event = useEvent()
    const project = useProject()
    const sdk = useSDK()
    const toast = useToast() 
    const kv = useKV()
    function evict(sessionID: string) {
      // Collect child session IDs so we can evict them too.
      const children = store.session.filter((s) => s.parentID === sessionID).map((s) => s.id)
      setStore(
        produce((draft) => {
          const messages = draft.message[sessionID]
          if (messages) {
            for (const msg of messages) delete draft.part[msg.id]
          }
          delete draft.message[sessionID]
          delete draft.session_diff[sessionID]
          delete draft.session_status[sessionID]
          delete draft.todo[sessionID]
          delete draft.permission[sessionID]
          delete draft.question[sessionID]
          delete draft.suggestion[sessionID]
          delete draft.network[sessionID]
        }),
      )
      fullSyncedSessions.delete(sessionID)
      for (const child of children) evict(child)
    }

    // Strip summary.diffs from user messages — the TUI never reads them
    // and they can carry multi-MB before/after file content strings.
    function strip(msg: Message): Message {
      if (msg.role !== "user" || !msg.summary?.diffs) return msg
      return { ...msg, summary: { ...msg.summary, diffs: [] } } as Message
    }

    const fullSyncedSessions = new Set<string>()
    let syncedWorkspace = project.workspace.current()

    function sessionListQuery(): { scope?: "project"; path?: string } {
      if (!kv.get("session_directory_filter_enabled", true)) return { scope: "project" }
      if (!project.data.instance.path.worktree || !project.data.instance.path.directory) return { scope: "project" }
      return {
        path: path
          .relative(path.resolve(project.data.instance.path.worktree), project.data.instance.path.directory)
          .replaceAll("\\", "/"),
      }
    }

    function listSessions() {
      return sdk.client.session
        .list({ start: Date.now() - 30 * 24 * 60 * 60 * 1000, ...sessionListQuery() })
        .then((x) => (x.data ?? []).toSorted((a, b) => a.id.localeCompare(b.id)))
    }

    event.subscribe((event) => {
      switch (event.type) {
        case "server.instance.disposed":
          void bootstrap()
          break
        case "permission.replied": {
          const requests = store.permission[event.properties.sessionID]
          if (!requests) break
          const match = Binary.search(requests, event.properties.requestID, (r) => r.id)
          if (!match.found) break
          setStore(
            "permission",
            event.properties.sessionID,
            produce((draft) => {
              draft.splice(match.index, 1)
            }),
          )
          break
        }

        case "permission.asked": {
          const request = event.properties
          const requests = store.permission[request.sessionID]
          if (!requests) {
            setStore("permission", request.sessionID, [request])
            break
          }
          const match = Binary.search(requests, request.id, (r) => r.id)
          if (match.found) {
            setStore("permission", request.sessionID, match.index, reconcile(request))
            break
          }
          setStore(
            "permission",
            request.sessionID,
            produce((draft) => {
              draft.splice(match.index, 0, request)
            }),
          )
          break
        }

        case "question.replied":
        case "question.rejected": {
          const requests = store.question[event.properties.sessionID]
          if (!requests) break
          const match = Binary.search(requests, event.properties.requestID, (r) => r.id)
          if (!match.found) break
          setStore(
            "question",
            event.properties.sessionID,
            produce((draft) => {
              draft.splice(match.index, 1)
            }),
          )
          break
        }

        case "question.asked": {
          const request = event.properties
          const requests = store.question[request.sessionID]
          if (!requests) {
            setStore("question", request.sessionID, [request])
            break
          }
          const match = Binary.search(requests, request.id, (r) => r.id)
          if (match.found) {
            setStore("question", request.sessionID, match.index, reconcile(request))
            break
          }
          setStore(
            "question",
            request.sessionID,
            produce((draft) => {
              draft.splice(match.index, 0, request)
            }),
          )
          break
        } 
        case "session.network.replied":
        case "session.network.rejected": {
          const requests = store.network[event.properties.sessionID]
          if (!requests) break
          const match = Binary.search(requests, event.properties.requestID, (r) => r.id)
          if (!match.found) break
          setStore(
            "network",
            event.properties.sessionID,
            produce((draft) => {
              draft.splice(match.index, 1)
            }),
          )
          break
        }
        case "suggestion.accepted":
        case "suggestion.dismissed":
        case "suggestion.shown": {
          handleSuggestionEvent(event, store, setStore)
          break
        }

        case "session.network.restored": {
          const requests = store.network[event.properties.sessionID]
          if (!requests) break
          const match = Binary.search(requests, event.properties.requestID, (r) => r.id)
          if (match.found) {
            setStore("network", event.properties.sessionID, match.index, "restored", true)
            setStore("network", event.properties.sessionID, match.index, "time", "restored", event.properties.time) 
          }
          break
        }

        case "session.network.asked": {
          const request = event.properties
          const requests = store.network[request.sessionID]
          if (!requests) {
            setStore("network", request.sessionID, [request])
            break
          }
          const match = Binary.search(requests, request.id, (r) => r.id)
          if (match.found) {
            setStore("network", request.sessionID, match.index, reconcile(request))
            break
          }
          setStore(
            "network",
            request.sessionID,
            produce((draft) => {
              draft.splice(match.index, 0, request)
            }),
          )
          break
        }
        case "todo.updated":
          setStore("todo", event.properties.sessionID, event.properties.todos)
          break

        case "session.diff":
          setStore("session_diff", event.properties.sessionID, event.properties.diff)
          break
        case "session.deleted": {
          const sid = event.properties.info.id
          const match = Binary.search(store.session, sid, (s) => s.id)
          if (match.found) {
            setStore(
              "session",
              produce((draft) => {
                draft.splice(match.index, 1)
              }),
            )
          }
          evict(sid)
          break
        }
        case "session.updated": {
          const result = Binary.search(store.session, event.properties.info.id, (s) => s.id)
          if (result.found) {
            setStore("session", result.index, reconcile(event.properties.info))
            break
          }
          setStore(
            "session",
            produce((draft) => {
              draft.splice(result.index, 0, event.properties.info)
            }),
          )
          break
        }

        case "session.status": {
          setStore("session_status", event.properties.sessionID, event.properties.status)
          break
        }
        case "message.updated": {
          const info = strip(event.properties.info)
          const messages = store.message[info.sessionID]
          if (!messages) {
            setStore("message", info.sessionID, [info])
            break
          }
          const result = Binary.search(messages, info.id, (m) => m.id)
          if (result.found) {
            setStore("message", info.sessionID, result.index, reconcile(info))
            break
          }
          setStore(
            "message",
            info.sessionID,
            produce((draft) => {
              draft.splice(result.index, 0, info)
            }),
          )
          const updated = store.message[info.sessionID]
          if (updated.length > 100) {
            const oldest = updated[0]
            batch(() => {
              setStore(
                "message",
                info.sessionID,
                produce((draft) => {
                  draft.shift()
                }),
              )
              setStore(
                "part",
                produce((draft) => {
                  delete draft[oldest.id]
                }),
              )
            })
          }
          break
        }
        case "message.removed": {
          const messages = store.message[event.properties.sessionID]
          const result = Binary.search(messages, event.properties.messageID, (m) => m.id)
          if (result.found) {
            setStore(
              "message",
              event.properties.sessionID,
              produce((draft) => {
                draft.splice(result.index, 1)
              }),
            )
          }
          break
        }
        case "message.part.updated": {
          const parts = store.part[event.properties.part.messageID]
          if (!parts) {
            setStore("part", event.properties.part.messageID, [event.properties.part])
            break
          }
          const result = Binary.search(parts, event.properties.part.id, (p) => p.id)
          if (result.found) {
            setStore("part", event.properties.part.messageID, result.index, reconcile(event.properties.part))
            break
          }
          setStore(
            "part",
            event.properties.part.messageID,
            produce((draft) => {
              draft.splice(result.index, 0, event.properties.part)
            }),
          )
          break
        }

        case "message.part.delta": {
          const parts = store.part[event.properties.messageID]
          if (!parts) break
          const result = Binary.search(parts, event.properties.partID, (p) => p.id)
          if (!result.found) break
          setStore(
            "part",
            event.properties.messageID,
            produce((draft) => {
              const part = draft[result.index]
              const field = event.properties.field as keyof typeof part
              const existing = part[field] as string | undefined
              ;(part[field] as string) = (existing ?? "") + event.properties.delta
            }),
          )
          break
        }

        case "message.part.removed": {
          const parts = store.part[event.properties.messageID]
          const result = Binary.search(parts, event.properties.partID, (p) => p.id)
          if (result.found)
            setStore(
              "part",
              event.properties.messageID,
              produce((draft) => {
                draft.splice(result.index, 1)
              }),
            )
          break
        }

        case "lsp.updated": {
          const workspace = project.workspace.current()
          void sdk.client.lsp.status({ workspace }).then((x) => setStore("lsp", x.data ?? []))
          break
        }

        case "mcp.tools.changed": {
          const workspace = project.workspace.current()
          void sdk.client.mcp.status({ workspace }).then((x) => setStore("mcp", reconcile(x.data ?? {})))
          break
        }

        case "vcs.branch.updated": {
          setStore("vcs", { branch: event.properties.branch })
          break
        }
        case "global.config.updated": {
          sdk.client.global.config.get().then((x) => {
            if (x.data) setStore("globalConfig", reconcile(x.data))
          })
          sdk.client.config.get().then((x) => {
            if (x.data) setStore("config", reconcile(x.data))
          })
          break
        }
        case "indexing.status": {
          setStore("indexing", reconcile(event.properties.status))
          break
        }
      }
    })

    const exit = useExit()
    const args = useArgs()

    async function bootstrap(input: { fatal?: boolean } = {}) {
      const fatal = input.fatal ?? true
      const workspace = project.workspace.current()
      if (workspace !== syncedWorkspace) {
        fullSyncedSessions.clear()
        syncedWorkspace = workspace
      }
      const projectPromise = project.sync()
      const sessionListPromise = projectPromise.then(() => listSessions())

      // blocking - include session.list when continuing a session
      const providersPromise = sdk.client.config.providers({ workspace }, { throwOnError: true })
      const providerListPromise = sdk.client.provider.list({ workspace }, { throwOnError: true })
      const consoleStatePromise = sdk.client.experimental.console
        .get({ workspace }, { throwOnError: true })
        .then((x) => x.data)
        .catch(() => emptyConsoleState)
      const agentsPromise = sdk.client.app.agents({ workspace }, { throwOnError: true })
      const configPromise = sdk.client.config.get({ workspace }, { throwOnError: true })
      const globalConfigPromise = sdk.client.global.config.get({ throwOnError: true }) 
      const blockingRequests: Promise<unknown>[] = [
        providersPromise,
        providerListPromise,
        agentsPromise,
        configPromise,
        globalConfigPromise, 
        projectPromise,
        ...(args.continue ? [sessionListPromise] : []),
      ]

      await Promise.all(blockingRequests)
        .then(async () => {
          const providersResponse = providersPromise.then((x) => x.data!)
          const providerListResponse = providerListPromise.then((x) => x.data!)
          const consoleStateResponse = consoleStatePromise
          const agentsResponse = agentsPromise.then((x) => x.data ?? [])
          const configResponse = configPromise.then((x) => x.data!)
          const globalConfigResponse = globalConfigPromise.then((x) => x.data!) 
          const sessionListResponse = args.continue ? sessionListPromise : undefined

          return Promise.all([
            providersResponse,
            providerListResponse,
            consoleStateResponse,
            agentsResponse,
            configResponse,
            globalConfigResponse, 
            ...(sessionListResponse ? [sessionListResponse] : []),
          ]).then((responses) => {
            const providers = responses[0]
            const providerList = responses[1]
            const consoleState = responses[2]
            const agents = responses[3]
            const config = responses[4]
            const globalConfig = responses[5] 
            const sessions = responses[6] 

            batch(() => {
              setStore("provider", reconcile(providers.providers))
              setStore("provider_default", reconcile(providers.default))
              setStore("provider_next", reconcile(providerList))
              setStore("console_state", reconcile(consoleState))
              setStore("agent", reconcile(agents))
              setStore("config", reconcile(config))
              setStore("globalConfig", reconcile(globalConfig)) 
              if (sessions !== undefined) setStore("session", reconcile(sessions))
            })
          })
        })
        .then(() => {
          if (store.status !== "complete") setStore("status", "partial")
          void Promise.all([
            ...(args.continue ? [] : [sessionListPromise.then((sessions) => setStore("session", reconcile(sessions)))]),
            consoleStatePromise.then((consoleState) => setStore("console_state", reconcile(consoleState))),
            sdk.client.command.list({ workspace }).then((x) => setStore("command", reconcile(x.data ?? []))),
            sdk.client.lsp.status({ workspace }).then((x) => setStore("lsp", reconcile(x.data ?? []))),
            sdk.client.mcp.status({ workspace }).then((x) => setStore("mcp", reconcile(x.data ?? {}))),
            sdk.client.experimental.resource
              .list({ workspace })
              .then((x) => setStore("mcp_resource", reconcile(x.data ?? {}))),
            sdk.client.formatter.status({ workspace }).then((x) => setStore("formatter", reconcile(x.data!))), 
            sdk.client.network.list().then((x) => {
              const next: Record<string, SessionNetworkWait[]> = {}
              for (const item of x.data ?? []) {
                if (!next[item.sessionID]) next[item.sessionID] = []
                next[item.sessionID].push(item)
              }
              setStore("network", reconcile(next))
            }),
            sdk.client.session.status({ workspace }).then((x) => {
              setStore("session_status", reconcile(x.data ?? {}))
            }),
            sdk.client.provider.auth({ workspace }).then((x) => setStore("provider_auth", reconcile(x.data ?? {}))),
            sdk.client.vcs.get({ workspace }).then((x) => setStore("vcs", reconcile(x.data))),
            project.workspace.sync(),
            sdk.client.config
              .warnings()
              .then((x) => {
                const list = x.data ?? []
                if (list.length === 0) return
                const first = list[0]
                const suffix = list.length > 1 ? ` (and ${list.length - 1} more)` : ""
                toast.show({
                  title: "Config Warning",
                  message: first.message + suffix,
                  variant: "warning",
                  duration: 0,
                })
              })
              .catch(() => {}),
            SaeeolIndexing.current().then((x) => setStore("indexing", reconcile(x))),
          ]).then(() => {
            setStore("status", "complete")
            // Re-fetch MCP status after bootstrap completes to catch
            // servers that finished connecting during the initial load.
            setTimeout(() => {
              const ws = project.workspace.current()
              void sdk.client.mcp.status({ workspace: ws }).then((x) => setStore("mcp", reconcile(x.data ?? {})))
            }, 3000)
          })
        })
        .catch(async (e) => {
          Log.Default.error("tui bootstrap failed", {
            error: e instanceof Error ? e.message : String(e),
            name: e instanceof Error ? e.name : undefined,
            stack: e instanceof Error ? e.stack : undefined,
          })
          if (fatal) {
            await exit(e)
          } else {
            throw e
          }
        })
    }

    onMount(() => {
      void bootstrap()
    })
    createEffect(
      on(
        () => project.workspace.current(),
        () => {
          fullSyncedSessions.clear()
          void bootstrap()
        },
        { defer: true },
      ),
    )

    const result = {
      data: store,
      set: setStore,
      get status() {
        return store.status
      },
      get ready() {
        // return true 
        if (process.env.SAEEOL_FAST_BOOT) return true
        return store.status !== "loading"
      },
      get path() {
        return project.instance.path()
      },
      session: {
        get(sessionID: string) {
          const match = Binary.search(store.session, sessionID, (s) => s.id)
          if (match.found) return store.session[match.index]
          return undefined
        },
        query() {
          return sessionListQuery()
        },
        async refresh() {
          const list = await listSessions()
          setStore("session", reconcile(list))
        },
        status(sessionID: string) {
          const session = result.session.get(sessionID)
          if (!session) return "idle"
          if (session.time.compacting) return "compacting"
          const messages = store.message[sessionID] ?? []
          const last = messages.at(-1)
          if (!last) return "idle"
          if (last.role === "user") return "working"
          return last.time.completed ? "idle" : "working"
        },
        async sync(sessionID: string) {
          if (fullSyncedSessions.has(sessionID)) return
          const [session, messages, todo, diff] = await Promise.all([
            sdk.client.session.get({ sessionID }, { throwOnError: true }),
            sdk.client.session.messages({ sessionID, limit: 100 }),
            sdk.client.session.todo({ sessionID }),
            sdk.client.session.diff({ sessionID }),
          ])
          setStore(
            produce((draft) => {
              const match = Binary.search(draft.session, sessionID, (s) => s.id)
              if (match.found) draft.session[match.index] = session.data!
              if (!match.found) draft.session.splice(match.index, 0, session.data!)
              draft.todo[sessionID] = todo.data ?? []
              draft.message[sessionID] = messages.data!.map((x) => strip(x.info)) 
              for (const message of messages.data!) {
                draft.part[message.info.id] = message.parts
              }
              draft.session_diff[sessionID] = diff.data ?? []
            }),
          )
          fullSyncedSessions.add(sessionID)
        },
        evict, 
      },
      bootstrap,
    }
    return result
  },
})