-- lib-core.api-discovery-test — Test-lib for lib-core.api-discovery
local api = require("lib-core.api-discovery")

local M = {}

function M.run_tests(ctx)
    -- Assertions added in plan tasks 2-7.

    -- ===== parse_lua_surface =====
    do
        local src = [[
local M = {}
M.foo = function(x) return x end
M.bar = function() end
M._private = function() end
local function not_in_M() end
return M
]]
        local surface = api.parse_lua_surface(src)
        engine.test.equals(#surface.public, 2,  "parse_lua_surface: 2 public functions")
        engine.test.equals(surface.public[1], "foo", "parse_lua_surface: first public is foo")
        engine.test.equals(surface.public[2], "bar", "parse_lua_surface: second public is bar")
        engine.test.equals(#surface.private, 1, "parse_lua_surface: 1 private function")
        engine.test.equals(surface.private[1], "_private", "parse_lua_surface: private name = _private")

        -- Edge: empty source
        local empty = api.parse_lua_surface("local M = {}\nreturn M")
        engine.test.equals(#empty.public, 0, "parse_lua_surface: empty source = no public")
        engine.test.equals(#empty.private, 0, "parse_lua_surface: empty source = no private")
    end

    -- ===== parse_readme_api =====
    do
        local md = [[
# lib-core.input

Some abstract.

## API

### `input.bind(action_name, keys)`
**Syntax:** `input.bind(action_name: string, keys: string[]) → void`

### `input.is_action_down(action) → bool`
Description.

## Conventions
Stuff.
]]
        local doc = api.parse_readme_api(md)
        engine.test.equals(#doc.documented, 2, "parse_readme_api: 2 documented functions")
        engine.test.equals(doc.documented[1], "bind", "parse_readme_api: first = bind")
        engine.test.equals(doc.documented[2], "is_action_down", "parse_readme_api: second = is_action_down")

        -- Edge: no API section
        local no_api = api.parse_readme_api("# Just abstract\nNothing else.")
        engine.test.equals(#no_api.documented, 0, "parse_readme_api: no API-section = empty")
    end

    -- ===== diff_surface =====
    do
        -- Happy: surface == documented
        local surface = { public = {"foo","bar"}, private = {"_x"} }
        local readme  = { documented = {"foo","bar"} }
        local diff = api.diff_surface(surface, readme)
        engine.test.equals(#diff.missing_docs, 0, "diff_surface: equal -> no missing")
        engine.test.equals(#diff.stale_docs, 0, "diff_surface: equal -> no stale")

        -- Surface > Doc -> missing
        local surface2 = { public = {"foo","bar","baz"}, private = {} }
        local readme2  = { documented = {"foo"} }
        local diff2 = api.diff_surface(surface2, readme2)
        engine.test.equals(#diff2.missing_docs, 2, "diff_surface: 2 missing docs")
        engine.test.assert(diff2.missing_docs[1] == "bar" or diff2.missing_docs[1] == "baz", "diff_surface: missing contains bar/baz")

        -- Doc > Surface -> stale
        local surface3 = { public = {"foo"}, private = {} }
        local readme3  = { documented = {"foo","gone","also_gone"} }
        local diff3 = api.diff_surface(surface3, readme3)
        engine.test.equals(#diff3.stale_docs, 2, "diff_surface: 2 stale docs")
    end

    -- ===== grep_engine_calls =====
    do
        local src = [[
local input = require("lib-core.input")
function update(ctx, dt)
    if engine.input.is_action_down("foo") then
        engine.render.text("hi")
    end
    engine.window.size()
end
]]
        local calls = api.grep_engine_calls(src)
        -- Order not guaranteed; check set membership
        local set = {}
        for _, c in ipairs(calls) do set[c] = true end
        engine.test.assert(set["engine.input.is_action_down"], "grep_engine_calls: engine.input.is_action_down")
        engine.test.assert(set["engine.render.text"],          "grep_engine_calls: engine.render.text")
        engine.test.assert(set["engine.window.size"],          "grep_engine_calls: engine.window.size")
        engine.test.equals(#calls, 3, "grep_engine_calls: 3 unique calls")

        -- Edge: no engine calls
        local empty = api.grep_engine_calls("local M = {}\nreturn M")
        engine.test.equals(#empty, 0, "grep_engine_calls: empty -> 0")
    end

    -- ===== generate_topology_block =====
    do
        -- Standard: lib with 1 dep + engine-calls
        local manifest = {
            id = "lib-core.foo",
            deps = { {id="lib-core.bar"} }
        }
        local engine_calls = {"engine.input.is_action_down"}
        local mermaid = api.generate_topology_block(manifest, engine_calls)
        engine.test.assert(string.find(mermaid, "graph LR") or string.find(mermaid, "graph TD"),
                          "generate_topology_block: starts with graph directive")
        engine.test.assert(string.find(mermaid, "lib%-core%.foo", 1, false), "generate_topology_block: self-node present")
        engine.test.assert(string.find(mermaid, "lib%-core%.bar", 1, false), "generate_topology_block: dep-node present")
        engine.test.assert(string.find(mermaid, "engine%.%*", 1, false),     "generate_topology_block: engine-node present")

        -- Asset-Lib: no deps, no engine-calls
        local asset = { id = "lib-asset.sprites", deps = {} }
        local asset_mermaid = api.generate_topology_block(asset, {})
        engine.test.assert(string.find(asset_mermaid, "lib%-asset%.sprites", 1, false), "generate_topology_block: asset-lib has self-node")
        engine.test.assert(not string.find(asset_mermaid, "engine%.%*", 1, false), "generate_topology_block: asset-lib has no engine-node")
    end

    -- ===== validate_readme_structure =====
    do
        local complete = [[
# lib-core.foo
Abstract.
| Field | Value |
|---|---|
| Version | 0.1.0 |

<!-- topology:start -->
<!-- topology:end -->

## API

### `foo.bar()`
Sig.

## References
- spec
]]
        local r = api.validate_readme_structure(complete, "core")
        engine.test.equals(#r.missing_sections, 0, "validate: complete README -> no missing")
        engine.test.assert(r.section_order_ok, "validate: complete README -> order ok")

        local missing_api = [[
# lib-core.foo
Abstract.
| F | V |

<!-- topology:start -->
<!-- topology:end -->

## References
- spec
]]
        local r2 = api.validate_readme_structure(missing_api, "core")
        engine.test.assert(#r2.missing_sections > 0, "validate: missing API -> reports missing")
        local has_api_missing = false
        for _, s in ipairs(r2.missing_sections) do
            if s == "API" then has_api_missing = true end
        end
        engine.test.assert(has_api_missing, "validate: missing-sections list contains 'API'")

        -- Tier community: lockerer
        local r3 = api.validate_readme_structure(missing_api, "community")
        engine.test.equals(#r3.missing_sections, 0, "validate: tier=community -> no enforcement")
    end

    engine.exit(engine.test.failures())
end

return M