import test, { describe, afterEach } from "node:test"
import assert from "node:assert"
import { buildLayoutForEntries, resolveGroups } from "./config-loader"
import { componentRegistry } from "../../components/registry"
import type { QuartzComponent, QuartzComponentConstructor } from "../../components/types"
import { PluginJsonEntry, LayoutPosition } from "./types"

const makeComponent = (name: string): QuartzComponent => {
  const c = (() => null) as unknown as QuartzComponent
  c.displayName = name
  return c
}

const makeConstructor = (name: string): QuartzComponentConstructor => {
  return () => makeComponent(name)
}

function makeEntry(
  source: string,
  layout?: { position: LayoutPosition; priority: number },
): PluginJsonEntry {
  return {
    source,
    enabled: true,
    options: {},
    ...(layout ? { layout: { position: layout.position, priority: layout.priority } } : {}),
  }
}

afterEach(() => {
  componentRegistry.clear()
})

describe("position assignment", () => {
  test("places component in correct position from layout.position", () => {
    const component = makeComponent("MyPlugin")
    componentRegistry.register("my-plugin", component, "test-source")

    const result = buildLayoutForEntries([makeEntry("my-plugin", { position: "left", priority: 10 })], {})
    assert.deepStrictEqual(result.left, [component])
  })

  test("places component in footer position", () => {
    const component = makeComponent("FooterComp")
    componentRegistry.register("footer-comp", component, "test-source")

    const result = buildLayoutForEntries(
      [makeEntry("footer-comp", { position: "footer", priority: 20 })],
      {},
    )
    assert.deepStrictEqual(result.footer, [component])
  })

  test("places component in header position", () => {
    const component = makeComponent("HeaderComp")
    componentRegistry.register("header-comp", component, "test-source")

    const result = buildLayoutForEntries(
      [makeEntry("header-comp", { position: "header", priority: 5 })],
      {},
    )
    assert.deepStrictEqual(result.header, [component])
  })

  test("returns empty arrays when no entries have layout", () => {
    const component = makeComponent("NoLayout")
    componentRegistry.register("no-layout", component, "test-source")

    const result = buildLayoutForEntries([makeEntry("no-layout")], {})
    assert.deepStrictEqual(result.header, [])
    assert.deepStrictEqual(result.left, [])
    assert.deepStrictEqual(result.right, [])
    assert.deepStrictEqual(result.beforeBody, [])
    assert.deepStrictEqual(result.afterBody, [])
    assert.deepStrictEqual(result.footer, [])
  })
})

describe("defaultPosition fallback", () => {
  test("uses manifest defaultPosition when no explicit layout", () => {
    const component = makeComponent("F")
    componentRegistry.register("f", component, "test-source", {
      name: "f",
      displayName: "F",
      description: "",
      version: "1",
      defaultPosition: "footer",
      defaultPriority: 50,
    })

    const result = buildLayoutForEntries([makeEntry("f")], {})
    assert.deepStrictEqual(result.footer, [component])
  })

  test("explicit layout takes precedence over defaultPosition", () => {
    const component = makeComponent("P")
    componentRegistry.register("p", component, "test-source", {
      name: "p",
      displayName: "P",
      description: "",
      version: "1",
      defaultPosition: "right",
    })

    const result = buildLayoutForEntries(
      [makeEntry("p", { position: "left", priority: 10 })],
      {},
    )
    assert.deepStrictEqual(result.left, [component])
    assert.deepStrictEqual(result.right, [])
  })

  test("silently skips invalid defaultPosition", () => {
    const component = makeComponent("Bad")
    componentRegistry.register("bad", component, "test-source", {
      name: "bad",
      displayName: "Bad",
      description: "",
      version: "1",
      defaultPosition: "body",
    })

    const result = buildLayoutForEntries([makeEntry("bad")], {})
    assert.deepStrictEqual(result.header, [])
    assert.deepStrictEqual(result.left, [])
    assert.deepStrictEqual(result.right, [])
    assert.deepStrictEqual(result.beforeBody, [])
    assert.deepStrictEqual(result.afterBody, [])
    assert.deepStrictEqual(result.footer, [])
  })
})

describe("priority sorting", () => {
  test("sorts components within a position by priority", () => {
    const compA = makeComponent("A")
    const compB = makeComponent("B")
    const compC = makeComponent("C")
    componentRegistry.register("a", compA, "test-source")
    componentRegistry.register("b", compB, "test-source")
    componentRegistry.register("c", compC, "test-source")

    const result = buildLayoutForEntries(
      [
        makeEntry("a", { position: "left", priority: 30 }),
        makeEntry("b", { position: "left", priority: 10 }),
        makeEntry("c", { position: "left", priority: 20 }),
      ],
      {},
    )

    const names = result.left?.map((component) => component.displayName)
    assert.deepStrictEqual(names, ["B", "C", "A"])
  })

  test("defaults to priority 50 for defaultPosition without defaultPriority", () => {
    const explicit = makeComponent("Explicit")
    const ctor = makeConstructor("Default")
    const defaulted = ctor(undefined)

    componentRegistry.register("explicit", explicit, "test-source")
    componentRegistry.register("defaulted", defaulted, "test-source", {
      name: "defaulted",
      displayName: "Default",
      description: "",
      version: "1",
      defaultPosition: "left",
    })

    const result = buildLayoutForEntries(
      [makeEntry("explicit", { position: "left", priority: 40 }), makeEntry("defaulted")],
      {},
    )

    const names = result.left?.map((component) => component.displayName)
    assert.deepStrictEqual(names, ["Explicit", "Default"])
  })
})

describe("resolveGroups", () => {
  test("returns ungrouped items in priority order", () => {
    const a = makeComponent("A")
    const b = makeComponent("B")
    const c = makeComponent("C")
    const items = [
      { component: a, priority: 30 },
      { component: b, priority: 10 },
      { component: c, priority: 20 },
    ]
    const result = resolveGroups(items, {})
    assert.strictEqual(result.length, 3)
    assert.strictEqual(result[0], b)
    assert.strictEqual(result[1], c)
    assert.strictEqual(result[2], a)
  })

  test("returns ungrouped items unchanged", () => {
    const a = makeComponent("A")
    const items = [{ component: a, priority: 10 }]
    const result = resolveGroups(items, {})
    assert.strictEqual(result.length, 1)
    assert.strictEqual(result[0], a)
  })

  test("returns empty array for empty input", () => {
    const result = resolveGroups([], {})
    assert.deepStrictEqual(result, [])
  })

  test("wraps grouped items in a Flex component", () => {
    const a = makeComponent("A")
    const b = makeComponent("B")
    const items = [
      { component: a, priority: 10, group: "toolbar" },
      { component: b, priority: 20, group: "toolbar" },
    ]
    const result = resolveGroups(items, {})
    assert.strictEqual(result.length, 1)
    assert.notStrictEqual(result[0], a)
    assert.notStrictEqual(result[0], b)
  })

  test("uses explicit group priority from config", () => {
    const grouped = makeComponent("Grouped")
    const ungrouped = makeComponent("Ungrouped")
    const items = [
      { component: grouped, priority: 50, group: "nav" },
      { component: ungrouped, priority: 10 },
    ]
    const result = resolveGroups(items, { nav: { priority: 5 } })
    assert.strictEqual(result.length, 2)
    assert.strictEqual(result[1], ungrouped)
  })

  test("falls back to first member priority when no group config", () => {
    const a = makeComponent("A")
    const b = makeComponent("B")
    const solo = makeComponent("Solo")
    const items = [
      { component: a, priority: 20, group: "nav" },
      { component: b, priority: 40, group: "nav" },
      { component: solo, priority: 30 },
    ]
    const result = resolveGroups(items, {})
    assert.strictEqual(result.length, 2)
    assert.strictEqual(result[1], solo)
  })

  test("single-member group still wraps in Flex", () => {
    const a = makeComponent("A")
    const items = [{ component: a, priority: 10, group: "solo" }]
    const result = resolveGroups(items, {})
    assert.strictEqual(result.length, 1)
    assert.notStrictEqual(result[0], a)
  })
})

describe("buildLayoutForEntries with display wrappers", () => {
  test("applies display wrapper for mobile-only", () => {
    const component = makeComponent("Wrapped")
    componentRegistry.register("wrapped-plugin", component, "test-source")

    const entry: PluginJsonEntry = {
      source: "wrapped-plugin",
      enabled: true,
      options: {},
      layout: { position: "left" as LayoutPosition, priority: 10, display: "mobile-only" },
    }
    const result = buildLayoutForEntries([entry], {})
    assert.strictEqual(result.left?.length, 1)
    assert.notStrictEqual(result.left?.[0], component)
  })
})

describe("buildLayoutForEntries with constructors", () => {
  test("instantiates constructor components via registry", () => {
    const ctor = makeConstructor("Instantiated")
    componentRegistry.register("ctor-plugin", ctor, "test-source")

    const result = buildLayoutForEntries(
      [makeEntry("ctor-plugin", { position: "left", priority: 10 })],
      {},
    )
    assert.strictEqual(result.left?.length, 1)
    assert.strictEqual(result.left?.[0].displayName, "Instantiated")
  })

  test("merges entry options with TS overrides for constructors", () => {
    const ctor = makeConstructor("Merged")
    componentRegistry.register("merge-plugin", ctor, "test-source")
    componentRegistry.setOptionOverrides("merge-plugin", { extra: true })

    const result = buildLayoutForEntries(
      [{ source: "merge-plugin", enabled: true, options: { base: 1 }, layout: { position: "right" as LayoutPosition, priority: 10 } }],
      {},
    )
    assert.strictEqual(result.right?.length, 1)
  })
})