import path from "node:path"
import { $ } from "bun"
import { expect } from "bun:test"
import { SdkPlugins } from "@opencode-ai/core/plugin/sdk"
import { Effect, Layer } from "effect"
import { tmpdir } from "../../core/test/fixture/tmpdir"
import { it } from "../../core/test/lib/effect"
import { startServer } from "./fixture/server"
import { ServerFetch } from "../src/fetch"

it.live(
  "serves lazy review bases, committed diffs, and unavailable-base errors",
  () =>
    Effect.gen(function* () {
      const tmp = yield* Effect.acquireDisposable(Effect.promise(() => tmpdir("opencode-vcs-endpoint-")))
      yield* Effect.promise(async () => {
        await $`git init -b main`.cwd(tmp.path).quiet()
        await $`git config commit.gpgsign false`.cwd(tmp.path).quiet()
        await $`git config user.email test@opencode.test`.cwd(tmp.path).quiet()
        await $`git config user.name Test`.cwd(tmp.path).quiet()
        await Bun.write(path.join(tmp.path, "file.txt"), "base\n")
        await $`git add .`.cwd(tmp.path).quiet()
        await $`git commit -m initial`.cwd(tmp.path).quiet()
        await $`git checkout -b feature main`.cwd(tmp.path).quiet()
        await Bun.write(path.join(tmp.path, "file.txt"), "committed\n")
        await $`git commit -am feature`.cwd(tmp.path).quiet()
        await Bun.write(path.join(tmp.path, "file.txt"), "dirty\n")
      })
      const server = yield* startServer(path.join(tmp.path, "config"))
      const url = new URL("/api/vcs/base", server.base)
      url.searchParams.set("location[directory]", tmp.path)
      const base = yield* Effect.promise(() => fetch(url, { headers: server.headers }))
      expect(base.status).toBe(200)
      expect(yield* Effect.promise(() => base.json())).toMatchObject({
        data: { name: "main", ref: "refs/heads/main", source: "reflog" },
      })
      yield* Effect.promise(() => $`git branch -m ambiguous`.cwd(tmp.path).quiet())
      const ambiguous = yield* Effect.promise(() => fetch(url, { headers: server.headers }))
      expect(ambiguous.status).toBe(503)
      expect(yield* Effect.promise(() => ambiguous.json())).toMatchObject({
        _tag: "ServiceUnavailableError",
        message: "Choose a review base",
      })
      url.pathname = "/api/vcs/diff"
      url.searchParams.set("mode", "committed")
      url.searchParams.set("base", "refs/heads/main")
      const diff = yield* Effect.promise(() => fetch(url, { headers: server.headers }))
      expect(diff.status).toBe(200)
      expect(yield* Effect.promise(() => diff.json())).toMatchObject({
        data: [{ file: "file.txt", patch: expect.stringContaining("-base\n+committed"), additions: 1, deletions: 1 }],
      })
      url.searchParams.set("base", "missing")
      const unavailable = yield* Effect.promise(() => fetch(url, { headers: server.headers }))
      expect(unavailable.status).toBe(503)
      expect(yield* Effect.promise(() => unavailable.json())).toMatchObject({
        _tag: "ServiceUnavailableError",
        service: "vcs",
      })
      yield* Effect.promise(() => $`git branch -D main`.cwd(tmp.path).quiet())
      url.searchParams.delete("base")
      url.searchParams.set("mode", "branch")
      const noBase = yield* Effect.promise(() => fetch(url, { headers: server.headers }))
      expect(noBase.status).toBe(503)
      expect(yield* Effect.promise(() => noBase.json())).toMatchObject({
        _tag: "ServiceUnavailableError",
        service: "vcs",
        message: "No review base available",
      })
    }),
  20_000,
)

it.live("maps a failing base provider to HTTP 503 instead of null metadata", () =>
  Effect.gen(function* () {
    const tmp = yield* Effect.acquireDisposable(Effect.promise(() => tmpdir("opencode-vcs-failure-")))
    const handler = yield* ServerFetch.make(
      { database: { path: ":memory:" }, config: { directory: tmp.path }, fs: { filewatcher: false } },
      {
        overrides: [
          SdkPlugins.node.replace(
            Layer.succeed(
              SdkPlugins.Service,
              SdkPlugins.Service.of({
                register: () => Effect.void,
                all: () => [
                  {
                    id: "failing-vcs",
                    version: "test",
                    effect: (ctx) =>
                      ctx.vcs
                        .transform((draft) => {
                          draft.add({
                            id: "failing",
                            name: "Failing VCS",
                            info: () => Effect.succeed({ branch: {} }),
                            branches: () => Effect.succeed([]),
                            status: () => Effect.succeed([]),
                            diff: () => Effect.succeed([]),
                            base: () => Effect.fail(new Error("provider failure")),
                          })
                          draft.default.set("failing")
                        })
                        .pipe(Effect.asVoid),
                  },
                ],
              }),
            ),
          ),
        ],
      },
    )
    const url = new URL("http://opencode.local/api/vcs/base")
    url.searchParams.set("location[directory]", tmp.path)
    const response = yield* Effect.promise(() => handler(new Request(url)))
    expect(response.status).toBe(503)
    expect(yield* Effect.promise(() => response.json())).toMatchObject({
      _tag: "ServiceUnavailableError",
      service: "vcs",
      message: "VCS provider could not resolve a review base",
    })
  }),
)