package cli

import (
	"bytes"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/spf13/cobra"

	"github.com/Apale7/opencode-provider-switch/internal/config"
)

func TestProviderAddPreservesExistingFields(t *testing.T) {
	t.Setenv(config.ConfigEnvVar, filepath.Join(t.TempDir(), "ocswitch.json"))
	configPath = ""

	cfg, err := loadCfg()
	if err != nil {
		t.Fatalf("loadCfg: %v", err)
	}
	cfg.UpsertProvider(config.Provider{
		ID:       "p1",
		Name:     "Old",
		BaseURL:  "https://old.example.com/v1",
		APIKey:   "sk-old",
		Headers:  map[string]string{"X-Test": "1"},
		Disabled: true,
	})
	if err := cfg.Save(); err != nil {
		t.Fatalf("save config: %v", err)
	}

	cmd := newProviderAddCmd()
	cmd.SetArgs([]string{"--id", "p1", "--base-url", "https://new.example.com/v1"})
	if err := cmd.Execute(); err != nil {
		t.Fatalf("execute provider add: %v", err)
	}

	cfg, err = loadCfg()
	if err != nil {
		t.Fatalf("reload config: %v", err)
	}
	p := cfg.FindProvider("p1")
	if p == nil {
		t.Fatal("provider p1 not found")
	}
	if p.Name != "Old" {
		t.Fatalf("Name = %q, want Old", p.Name)
	}
	if p.APIKey != "sk-old" {
		t.Fatalf("APIKey = %q, want sk-old", p.APIKey)
	}
	if p.Headers["X-Test"] != "1" {
		t.Fatalf("Headers = %#v, want preserved header", p.Headers)
	}
	if p.BaseURL != "https://new.example.com/v1" {
		t.Fatalf("BaseURL = %q, want updated URL", p.BaseURL)
	}
	if !p.Disabled {
		t.Fatal("Disabled = false, want true to preserve provider state")
	}
}

func TestProviderAddRejectsInvalidBaseURL(t *testing.T) {
	configFile := filepath.Join(t.TempDir(), "ocswitch.json")
	t.Setenv(config.ConfigEnvVar, configFile)
	configPath = ""

	cmd := newProviderAddCmd()
	cmd.SetArgs([]string{"--id", "p1", "--base-url", "https://example.com/api"})
	err := cmd.Execute()
	if err == nil {
		t.Fatal("expected invalid --base-url error")
	}
	if got := err.Error(); got != "invalid --base-url: base_url must end with /v1" {
		t.Fatalf("error = %q", got)
	}
	if _, statErr := os.Stat(configFile); !os.IsNotExist(statErr) {
		t.Fatalf("expected no config file write, stat err = %v", statErr)
	}
}

func TestAliasAddPreservesExistingFields(t *testing.T) {
	t.Setenv(config.ConfigEnvVar, filepath.Join(t.TempDir(), "ocswitch.json"))
	configPath = ""

	cfg, err := loadCfg()
	if err != nil {
		t.Fatalf("loadCfg: %v", err)
	}
	cfg.UpsertAlias(config.Alias{
		Alias:       "gpt-5.4",
		DisplayName: "Old Name",
		Enabled:     true,
		Targets:     []config.Target{{Provider: "p1", Model: "up-1", Enabled: true}},
	})
	if err := cfg.Save(); err != nil {
		t.Fatalf("save config: %v", err)
	}

	cmd := newAliasAddCmd()
	cmd.SetArgs([]string{"--name", "gpt-5.4"})
	if err := cmd.Execute(); err != nil {
		t.Fatalf("execute alias add: %v", err)
	}

	cfg, err = loadCfg()
	if err != nil {
		t.Fatalf("reload config: %v", err)
	}
	a := cfg.FindAlias("gpt-5.4")
	if a == nil {
		t.Fatal("alias gpt-5.4 not found")
	}
	if a.DisplayName != "Old Name" {
		t.Fatalf("DisplayName = %q, want Old Name", a.DisplayName)
	}
	if !a.Enabled {
		t.Fatal("Enabled = false, want true")
	}
	if len(a.Targets) != 1 || a.Targets[0].Provider != "p1" || a.Targets[0].Model != "up-1" {
		t.Fatalf("Targets = %#v, want preserved target", a.Targets)
	}
}

func TestProviderEnableDisableCommands(t *testing.T) {
	t.Setenv(config.ConfigEnvVar, filepath.Join(t.TempDir(), "ocswitch.json"))
	configPath = ""

	cfg, err := loadCfg()
	if err != nil {
		t.Fatalf("loadCfg: %v", err)
	}
	cfg.UpsertProvider(config.Provider{
		ID:      "p1",
		BaseURL: "https://example.com/v1",
	})
	if err := cfg.Save(); err != nil {
		t.Fatalf("save config: %v", err)
	}

	disableCmd := newProviderDisableCmd()
	disableCmd.SetArgs([]string{"p1"})
	if err := disableCmd.Execute(); err != nil {
		t.Fatalf("execute provider disable: %v", err)
	}

	cfg, err = loadCfg()
	if err != nil {
		t.Fatalf("reload after disable: %v", err)
	}
	if provider := cfg.FindProvider("p1"); provider == nil || !provider.Disabled {
		t.Fatalf("provider after disable = %#v, want disabled=true", provider)
	}

	enableCmd := newProviderEnableCmd()
	enableCmd.SetArgs([]string{"p1"})
	if err := enableCmd.Execute(); err != nil {
		t.Fatalf("execute provider enable: %v", err)
	}

	cfg, err = loadCfg()
	if err != nil {
		t.Fatalf("reload after enable: %v", err)
	}
	if provider := cfg.FindProvider("p1"); provider == nil || provider.Disabled {
		t.Fatalf("provider after enable = %#v, want disabled=false", provider)
	}
}

func TestOpencodeSyncDoesNotPanicOnSliceModelMetadata(t *testing.T) {
	t.Setenv(config.ConfigEnvVar, filepath.Join(t.TempDir(), "ocswitch.json"))
	configPath = ""

	cfg, err := loadCfg()
	if err != nil {
		t.Fatalf("loadCfg: %v", err)
	}
	cfg.UpsertProvider(config.Provider{
		ID:      "p1",
		BaseURL: "https://example.com/v1",
	})
	cfg.UpsertAlias(config.Alias{
		Alias:   "gpt-5.4",
		Enabled: true,
		Targets: []config.Target{{Provider: "p1", Model: "up-1", Enabled: true}},
	})
	if err := cfg.Save(); err != nil {
		t.Fatalf("save config: %v", err)
	}

	target := filepath.Join(t.TempDir(), "opencode.jsonc")
	seed := []byte("{\n  \"$schema\": \"https://opencode.ai/config.json\",\n  \"provider\": {\n    \"ocswitch\": {\n      \"npm\": \"@ai-sdk/openai\",\n      \"name\": \"OpenCode Provider Switch CLI\",\n      \"options\": {\n        \"baseURL\": \"http://127.0.0.1:9982/v1\",\n        \"apiKey\": \"ocswitch-local\",\n        \"setCacheKey\": true\n      },\n      \"models\": {\n        \"gpt-5.4\": {\n          \"name\": \"custom-display-name\",\n          \"tags\": [\"reasoning\", \"priority\"],\n          \"variants\": [\n            {\"name\": \"high\", \"effort\": \"high\"}\n          ]\n        }\n      }\n    }\n  }\n}\n")
	if err := os.WriteFile(target, seed, 0o600); err != nil {
		t.Fatalf("write target config: %v", err)
	}

	cmd := newOpencodeSyncCmd()
	var stdout bytes.Buffer
	cmd.SetOut(&stdout)
	cmd.SetErr(&stdout)
	cmd.SetArgs([]string{"--target", target})

	defer func() {
		if r := recover(); r != nil {
			t.Fatalf("opencode sync panicked with slice metadata: %v", r)
		}
	}()

	if err := cmd.Execute(); err != nil {
		t.Fatalf("execute opencode sync: %v", err)
	}
	if got := stdout.String(); got != "✓ no changes required at "+target+"\n" {
		t.Fatalf("stdout = %q", got)
	}
	data, err := os.ReadFile(target)
	if err != nil {
		t.Fatalf("read target config: %v", err)
	}
	if !bytes.Equal(data, seed) {
		t.Fatalf("sync rewrote unchanged config:\n%s", string(data))
	}
}

func TestHelpTextIncludesOperationalGuidance(t *testing.T) {
	tests := []struct {
		name        string
		cmd         *cobra.Command
		wantLong    []string
		wantExample []string
	}{
		{
			name:        "root",
			cmd:         NewRootCmd("test"),
			wantLong:    []string{"Typical workflow:", "prefer command-local --help over README summaries"},
			wantExample: []string{"ocswitch provider add", "ocswitch serve"},
		},
		{
			name:        "provider add",
			cmd:         newProviderAddCmd(),
			wantLong:    []string{"--base-url must point at an", "omitted mutable fields keep their current", "values: name, api key, headers"},
			wantExample: []string{"ocswitch provider add --id relay", "--header X-Workspace=my-team"},
		},
		{
			name:        "alias bind",
			cmd:         newAliasBindCmd(),
			wantLong:    []string{"auto-creates an enabled alias", "Order matters:"},
			wantExample: []string{"--provider codex --model GPT-5.4", "--disabled"},
		},
		{
			name:        "opencode sync",
			cmd:         newOpencodeSyncCmd(),
			wantLong:    []string{"does not follow", "writes alias", "exposure into provider.ocswitch.models"},
			wantExample: []string{"--dry-run", "--set-small-model ocswitch/gpt-5.4-mini"},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.cmd.Long == "" {
				t.Fatal("Long help is empty")
			}
			if tt.cmd.Example == "" {
				t.Fatal("Example help is empty")
			}
			for _, want := range tt.wantLong {
				if !strings.Contains(tt.cmd.Long, want) {
					t.Fatalf("Long help missing %q\n%s", want, tt.cmd.Long)
				}
			}
			for _, want := range tt.wantExample {
				if !strings.Contains(tt.cmd.Example, want) {
					t.Fatalf("Example help missing %q\n%s", want, tt.cmd.Example)
				}
			}
		})
	}

	root := NewRootCmd("test")
	flag := root.PersistentFlags().Lookup("config")
	if flag == nil {
		t.Fatal("--config flag not found")
	}
	for _, want := range []string{"$OCSWITCH_CONFIG", "$XDG_CONFIG_HOME/ocswitch/config.json", "~/.config/ocswitch/config.json"} {
		if !strings.Contains(flag.Usage, want) {
			t.Fatalf("config flag usage missing %q: %s", want, flag.Usage)
		}
	}
}