import { describe, expect, mock, test } from "bun:test"
import type { Project as ProjectNS } from "../../src/project/project"
import { Log } from "../../src/util/log"
import { Storage } from "../../src/storage/storage"
import { $ } from "bun"
import path from "path"
import { tmpdir } from "../fixture/fixture"

Log.init({ print: false })

const bunModule = await import("bun")
type Mode = "none" | "rev-list-fail" | "top-fail" | "common-dir-fail"
let mode: Mode = "none"

function render(parts: TemplateStringsArray, vals: unknown[]) {
  return parts.reduce((acc, part, i) => `${acc}${part}${i < vals.length ? String(vals[i]) : ""}`, "")
}

function fakeShell(output: { exitCode: number; stdout: string; stderr: string }) {
  const result = {
    exitCode: output.exitCode,
    stdout: Buffer.from(output.stdout),
    stderr: Buffer.from(output.stderr),
    text: async () => output.stdout,
  }
  const shell = {
    quiet: () => shell,
    nothrow: () => shell,
    cwd: () => shell,
    env: () => shell,
    text: async () => output.stdout,
    then: (onfulfilled: (value: typeof result) => unknown, onrejected?: (reason: unknown) => unknown) =>
      Promise.resolve(result).then(onfulfilled, onrejected),
    catch: (onrejected: (reason: unknown) => unknown) => Promise.resolve(result).catch(onrejected),
    finally: (onfinally: (() => void) | undefined | null) => Promise.resolve(result).finally(onfinally),
  }
  return shell
}

mock.module("bun", () => ({
  ...bunModule,
  $: (parts: TemplateStringsArray, ...vals: unknown[]) => {
    const cmd = render(parts, vals).replaceAll(",", " ").replace(/\s+/g, " ").trim()
    if (
      mode === "rev-list-fail" &&
      cmd.includes("git rev-list") &&
      cmd.includes("--max-parents=0") &&
      cmd.includes("--all")
    ) {
      return fakeShell({ exitCode: 128, stdout: "", stderr: "fatal" })
    }
    if (mode === "top-fail" && cmd.includes("git rev-parse") && cmd.includes("--show-toplevel")) {
      return fakeShell({ exitCode: 128, stdout: "", stderr: "fatal" })
    }
    if (mode === "common-dir-fail" && cmd.includes("git rev-parse") && cmd.includes("--git-common-dir")) {
      return fakeShell({ exitCode: 128, stdout: "", stderr: "fatal" })
    }
    return (bunModule.$ as any)(parts, ...vals)
  },
}))

async function withMode(next: Mode, run: () => Promise<void>) {
  const prev = mode
  mode = next
  try {
    await run()
  } finally {
    mode = prev
  }
}

async function loadProject() {
  return (await import("../../src/project/project")).Project
}

describe("Project.fromDirectory", () => {
  test("should handle git repository with no commits", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir()
    await $`git init`.cwd(tmp.path).quiet()

    const { project } = await p.fromDirectory(tmp.path)

    expect(project).toBeDefined()
    expect(project.id).toBe("global")
    expect(project.vcs).toBe("git")
    expect(project.worktree).toBe(tmp.path)

    const opencodeFile = path.join(tmp.path, ".git", "opencode")
    const fileExists = await Bun.file(opencodeFile).exists()
    expect(fileExists).toBe(false)
  })

  test("should handle git repository with commits", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })

    const { project } = await p.fromDirectory(tmp.path)

    expect(project).toBeDefined()
    expect(project.id).not.toBe("global")
    expect(project.vcs).toBe("git")
    expect(project.worktree).toBe(tmp.path)

    const opencodeFile = path.join(tmp.path, ".git", "opencode")
    const fileExists = await Bun.file(opencodeFile).exists()
    expect(fileExists).toBe(true)
  })

  test("keeps git vcs when rev-list exits non-zero with empty output", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir()
    await $`git init`.cwd(tmp.path).quiet()

    await withMode("rev-list-fail", async () => {
      const { project } = await p.fromDirectory(tmp.path)
      expect(project.vcs).toBe("git")
      expect(project.id).toBe("global")
      expect(project.worktree).toBe(tmp.path)
    })
  })

  test("keeps git vcs when show-toplevel exits non-zero with empty output", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })

    await withMode("top-fail", async () => {
      const { project, sandbox } = await p.fromDirectory(tmp.path)
      expect(project.vcs).toBe("git")
      expect(project.worktree).toBe(tmp.path)
      expect(sandbox).toBe(tmp.path)
    })
  })

  test("keeps git vcs when git-common-dir exits non-zero with empty output", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })

    await withMode("common-dir-fail", async () => {
      const { project, sandbox } = await p.fromDirectory(tmp.path)
      expect(project.vcs).toBe("git")
      expect(project.worktree).toBe(tmp.path)
      expect(sandbox).toBe(tmp.path)
    })
  })
})

describe("Project.fromDirectory with worktrees", () => {
  test("should set worktree to root when called from root", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })

    const { project, sandbox } = await p.fromDirectory(tmp.path)

    expect(project.worktree).toBe(tmp.path)
    expect(sandbox).toBe(tmp.path)
    expect(project.sandboxes).not.toContain(tmp.path)
  })

  test("should set worktree to root when called from a worktree", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })

    const worktreePath = path.join(tmp.path, "..", "worktree-test")
    await $`git worktree add ${worktreePath} -b test-branch`.cwd(tmp.path).quiet()

    const { project, sandbox } = await p.fromDirectory(worktreePath)

    expect(project.worktree).toBe(tmp.path)
    expect(sandbox).toBe(worktreePath)
    expect(project.sandboxes).toContain(worktreePath)
    expect(project.sandboxes).not.toContain(tmp.path)

    await $`git worktree remove ${worktreePath}`.cwd(tmp.path).quiet()
  })

  test("should accumulate multiple worktrees in sandboxes", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })

    const worktree1 = path.join(tmp.path, "..", "worktree-1")
    const worktree2 = path.join(tmp.path, "..", "worktree-2")
    await $`git worktree add ${worktree1} -b branch-1`.cwd(tmp.path).quiet()
    await $`git worktree add ${worktree2} -b branch-2`.cwd(tmp.path).quiet()

    await p.fromDirectory(worktree1)
    const { project } = await p.fromDirectory(worktree2)

    expect(project.worktree).toBe(tmp.path)
    expect(project.sandboxes).toContain(worktree1)
    expect(project.sandboxes).toContain(worktree2)
    expect(project.sandboxes).not.toContain(tmp.path)

    await $`git worktree remove ${worktree1}`.cwd(tmp.path).quiet()
    await $`git worktree remove ${worktree2}`.cwd(tmp.path).quiet()
  })
})

describe("Project.discover", () => {
  test("should discover favicon.png in root", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })
    const { project } = await p.fromDirectory(tmp.path)

    const pngData = Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])
    await Bun.write(path.join(tmp.path, "favicon.png"), pngData)

    await p.discover(project)

    const updated = await Storage.read<ProjectNS.Info>(["project", project.id])
    expect(updated.icon).toBeDefined()
    expect(updated.icon?.url).toStartWith("data:")
    expect(updated.icon?.url).toContain("base64")
    expect(updated.icon?.color).toBeUndefined()
  })

  test("should not discover non-image files", async () => {
    const p = await loadProject()
    await using tmp = await tmpdir({ git: true })
    const { project } = await p.fromDirectory(tmp.path)

    await Bun.write(path.join(tmp.path, "favicon.txt"), "not an image")

    await p.discover(project)

    const updated = await Storage.read<ProjectNS.Info>(["project", project.id])
    expect(updated.icon).toBeUndefined()
  })
})
