package tools_test

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"gitea.d-ma.be/mathias/gitea-mcp/internal/allowlist"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/gitea"
	"gitea.d-ma.be/mathias/gitea-mcp/internal/tools"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestRepoStatusComposesThreeEndpoints(t *testing.T) {
	mux := http.NewServeMux()

	mux.HandleFunc("/api/v1/repos/owner/repo/branches", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[
			{"name":"main","commit":{"id":"abc","url":""}},
			{"name":"feat/x","commit":{"id":"def","url":""}}
		]`))
	})
	mux.HandleFunc("/api/v1/repos/owner/repo/pulls", func(w http.ResponseWriter, r *http.Request) {
		assert.Equal(t, "open", r.URL.Query().Get("state"))
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[{
			"number":3,"title":"My PR","html_url":"http://example.com/pulls/3",
			"state":"open","draft":false,
			"head":{"ref":"feat/x"},"base":{"ref":"main"}
		}]`))
	})
	mux.HandleFunc("/api/v1/repos/owner/repo/branch_protections/main", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"required_approvals":1,"push_whitelist_usernames":[],"merge_whitelist_usernames":[]}`))
	})

	srv := httptest.NewServer(mux)
	defer srv.Close()

	tool := tools.NewRepoStatus(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
	out, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"owner","name":"repo","branch":"main"}`))
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(out, &result))

	branches := result["branches"].([]any)
	assert.Len(t, branches, 2)

	openPRs := result["open_prs"].([]any)
	assert.Len(t, openPRs, 1)
	assert.Equal(t, float64(3), openPRs[0].(map[string]any)["number"])

	protection := result["protection"].(map[string]any)
	assert.Equal(t, true, protection["protected"])
	assert.Equal(t, float64(1), protection["required_approvals"])
}

func TestRepoStatusUnprotectedBranch(t *testing.T) {
	mux := http.NewServeMux()

	mux.HandleFunc("/api/v1/repos/owner/repo/branches", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[{"name":"main","commit":{"id":"abc","url":""}}]`))
	})
	mux.HandleFunc("/api/v1/repos/owner/repo/pulls", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[]`))
	})
	mux.HandleFunc("/api/v1/repos/owner/repo/branch_protections/main", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNotFound)
		_, _ = w.Write([]byte(`{"message":"not found"}`))
	})

	srv := httptest.NewServer(mux)
	defer srv.Close()

	tool := tools.NewRepoStatus(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
	out, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"owner","name":"repo","branch":"main"}`))
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(out, &result))
	protection := result["protection"].(map[string]any)
	assert.Equal(t, false, protection["protected"])
}

func TestRepoStatusAllowlistRejects(t *testing.T) {
	tool := tools.NewRepoStatus(gitea.NewClient("http://unused", ""), allowlist.New([]string{"allowed"}))
	_, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"evil","name":"repo","branch":"main"}`))
	require.Error(t, err)
}

func TestRepoStatusDefaultsBranchFromRepo(t *testing.T) {
	mux := http.NewServeMux()

	mux.HandleFunc("/api/v1/repos/owner/repo", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"name":"repo","full_name":"owner/repo","default_branch":"main","description":"","private":false,"clone_url":"","html_url":""}`))
	})
	mux.HandleFunc("/api/v1/repos/owner/repo/branches", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[{"name":"main","commit":{"id":"abc","url":""}}]`))
	})
	mux.HandleFunc("/api/v1/repos/owner/repo/pulls", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[]`))
	})
	mux.HandleFunc("/api/v1/repos/owner/repo/branch_protections/main", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"required_approvals":0,"push_whitelist_usernames":[],"merge_whitelist_usernames":[]}`))
	})

	srv := httptest.NewServer(mux)
	defer srv.Close()

	tool := tools.NewRepoStatus(gitea.NewClient(srv.URL, "tok"), allowlist.New([]string{"owner"}))
	// no "branch" field — triggers DefaultBranch fallback
	out, err := tool.Call(context.Background(), json.RawMessage(`{"owner":"owner","name":"repo"}`))
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(out, &result))
	assert.NotNil(t, result["branches"])
	assert.NotNil(t, result["open_prs"])
	assert.NotNil(t, result["protection"])
}