package scriptorium

import (
	"context"
	"reflect"
	"strings"
	"testing"
	"time"
)

func TestRenderConstructsCommand(t *testing.T) {
	commands := &fakeCommands{result: CommandResult{Stdout: []byte(`{"ok":true}`)}}
	runner := Runner{
		Binary:     "/usr/local/bin/scriptorium",
		ConfigPath: "/etc/scriptorium.yml",
		Profile:    "weather",
		Timeout:    time.Minute,
		Commands:   commands,
	}

	result, err := runner.Render(context.Background(), RenderRequest{
		PromptID:        "weather.daily_report",
		DataPackagePath: "/tmp/data_package.yaml",
	})
	if err != nil {
		t.Fatalf("Render() error = %v", err)
	}

	wantArgs := []string{
		"render",
		"--config", "/etc/scriptorium.yml",
		"--profile", "weather",
		"--prompt", "weather.daily_report",
		"--input", "data_package=/tmp/data_package.yaml",
		"--format", "json",
	}
	if commands.name != "/usr/local/bin/scriptorium" {
		t.Fatalf("command name = %q, want custom binary", commands.name)
	}
	if !reflect.DeepEqual(commands.args, wantArgs) {
		t.Fatalf("args = %#v, want %#v", commands.args, wantArgs)
	}
	if !reflect.DeepEqual(result.Command, append([]string{"/usr/local/bin/scriptorium"}, wantArgs...)) {
		t.Fatalf("result command = %#v, want full argv", result.Command)
	}
}

func TestRenderReturnsResultForNonzeroExit(t *testing.T) {
	runner := Runner{
		Commands: &fakeCommands{
			result: CommandResult{
				Stderr:   []byte("missing input"),
				ExitCode: 1,
			},
		},
	}

	result, err := runner.Render(context.Background(), RenderRequest{
		PromptID:        "weather.daily_report",
		DataPackagePath: "/tmp/data_package.yaml",
	})
	if err == nil {
		t.Fatal("Render() error = nil, want nonzero exit error")
	}
	if result == nil {
		t.Fatal("Render() result = nil, want captured result")
	}
	if result.ExitCode != 1 {
		t.Fatalf("ExitCode = %d, want 1", result.ExitCode)
	}
	if !strings.Contains(err.Error(), "missing input") {
		t.Fatalf("error = %q, want stderr context", err.Error())
	}
}

func TestRunConstructsCommand(t *testing.T) {
	commands := &fakeCommands{result: CommandResult{Stderr: []byte("wrote report")}}
	runner := Runner{
		Binary:     "/usr/local/bin/scriptorium",
		ConfigPath: "/etc/scriptorium.yml",
		Profile:    "weather",
		Timeout:    45 * time.Second,
		Commands:   commands,
	}

	result, err := runner.Run(context.Background(), RunRequest{
		PromptID:        "weather.daily_report",
		DataPackagePath: "/tmp/data_package.yaml",
		OutputPath:      "/tmp/daily.md",
	})
	if err != nil {
		t.Fatalf("Run() error = %v", err)
	}

	wantArgs := []string{
		"run",
		"--config", "/etc/scriptorium.yml",
		"--profile", "weather",
		"--prompt", "weather.daily_report",
		"--input", "data_package=/tmp/data_package.yaml",
		"--out", "/tmp/daily.md",
	}
	if commands.name != "/usr/local/bin/scriptorium" {
		t.Fatalf("command name = %q, want custom binary", commands.name)
	}
	if !reflect.DeepEqual(commands.args, wantArgs) {
		t.Fatalf("args = %#v, want %#v", commands.args, wantArgs)
	}
	if commands.timeout != 45*time.Second {
		t.Fatalf("timeout = %s, want 45s", commands.timeout)
	}
	if !reflect.DeepEqual(result.Command, append([]string{"/usr/local/bin/scriptorium"}, wantArgs...)) {
		t.Fatalf("result command = %#v, want full argv", result.Command)
	}
	if result.OutputPath != "/tmp/daily.md" {
		t.Fatalf("OutputPath = %q, want /tmp/daily.md", result.OutputPath)
	}
}

func TestRunReturnsResultForValidationExit(t *testing.T) {
	runner := Runner{
		Commands: &fakeCommands{
			result: CommandResult{
				Stdout:   []byte("# Daily Report\n"),
				Stderr:   []byte("validation failed"),
				ExitCode: 2,
			},
		},
	}

	result, err := runner.Run(context.Background(), RunRequest{
		PromptID:        "weather.daily_report",
		DataPackagePath: "/tmp/data_package.yaml",
		OutputPath:      "/tmp/daily.md",
	})
	if err == nil {
		t.Fatal("Run() error = nil, want nonzero exit error")
	}
	if result == nil {
		t.Fatal("Run() result = nil, want captured result")
	}
	if result.ExitCode != 2 {
		t.Fatalf("ExitCode = %d, want 2", result.ExitCode)
	}
	if !strings.Contains(err.Error(), "validation failed") {
		t.Fatalf("error = %q, want stderr context", err.Error())
	}
}

func TestStructuredRunConstructsCommandWithoutSchemaFlags(t *testing.T) {
	commands := &fakeCommands{result: CommandResult{
		Stdout:          []byte(`{"summary":"ok"}`),
		Stderr:          []byte("wrote generated text"),
		StdoutTruncated: true,
	}}
	runner := Runner{
		Binary:     "/usr/local/bin/scriptorium",
		ConfigPath: "/etc/scriptorium.yml",
		Profile:    "weather",
		Timeout:    30 * time.Second,
		Commands:   commands,
	}

	result, err := runner.StructuredRun(context.Background(), StructuredRunRequest{
		PromptID:        "weather.hourly_generated_text",
		DataPackagePath: "/tmp/hourly.data_package.yaml",
		OutputPath:      "/tmp/hourly.generated_text.raw.json",
	})
	if err != nil {
		t.Fatalf("StructuredRun() error = %v", err)
	}

	wantArgs := []string{
		"run",
		"--config", "/etc/scriptorium.yml",
		"--profile", "weather",
		"--prompt", "weather.hourly_generated_text",
		"--input", "data_package=/tmp/hourly.data_package.yaml",
		"--out", "/tmp/hourly.generated_text.raw.json",
	}
	if commands.name != "/usr/local/bin/scriptorium" {
		t.Fatalf("command name = %q, want custom binary", commands.name)
	}
	if !reflect.DeepEqual(commands.args, wantArgs) {
		t.Fatalf("args = %#v, want %#v", commands.args, wantArgs)
	}
	for _, disallowed := range []string{"--format", "--schema", "--schema-path", "--json-schema"} {
		if containsArg(commands.args, disallowed) {
			t.Fatalf("args = %#v, should not include %q", commands.args, disallowed)
		}
	}
	if commands.timeout != 30*time.Second {
		t.Fatalf("timeout = %s, want 30s", commands.timeout)
	}
	if !reflect.DeepEqual(result.Command, append([]string{"/usr/local/bin/scriptorium"}, wantArgs...)) {
		t.Fatalf("result command = %#v, want full argv", result.Command)
	}
	if result.Stdout != `{"summary":"ok"}` || result.Stderr != "wrote generated text" || !result.StdoutTruncated {
		t.Fatalf("result = %#v, want captured output and truncation flags", result)
	}
	if result.OutputPath != "/tmp/hourly.generated_text.raw.json" {
		t.Fatalf("OutputPath = %q, want generated text raw path", result.OutputPath)
	}
}

func TestStructuredRunReturnsResultForNonzeroExit(t *testing.T) {
	runner := Runner{
		Commands: &fakeCommands{
			result: CommandResult{
				Stdout:   []byte(`{"summary":"partial"}`),
				Stderr:   []byte("structured output failed"),
				ExitCode: 3,
			},
		},
	}

	result, err := runner.StructuredRun(context.Background(), StructuredRunRequest{
		PromptID:        "weather.hourly_generated_text",
		DataPackagePath: "/tmp/hourly.data_package.yaml",
		OutputPath:      "/tmp/hourly.generated_text.raw.json",
	})
	if err == nil {
		t.Fatal("StructuredRun() error = nil, want nonzero exit error")
	}
	if result == nil {
		t.Fatal("StructuredRun() result = nil, want captured result")
	}
	if result.ExitCode != 3 {
		t.Fatalf("ExitCode = %d, want 3", result.ExitCode)
	}
	if result.Stdout != `{"summary":"partial"}` || result.OutputPath != "/tmp/hourly.generated_text.raw.json" {
		t.Fatalf("result = %#v, want captured result fields", result)
	}
	if !strings.Contains(err.Error(), "structured output failed") {
		t.Fatalf("error = %q, want stderr context", err.Error())
	}
}

func TestStructuredRunValidatesRequiredFieldsBeforeExecution(t *testing.T) {
	tests := []struct {
		name string
		req  StructuredRunRequest
		want string
	}{
		{
			name: "prompt id",
			req: StructuredRunRequest{
				DataPackagePath: "/tmp/hourly.data_package.yaml",
				OutputPath:      "/tmp/hourly.generated_text.raw.json",
			},
			want: "prompt id is required",
		},
		{
			name: "data package path",
			req: StructuredRunRequest{
				PromptID:   "weather.hourly_generated_text",
				OutputPath: "/tmp/hourly.generated_text.raw.json",
			},
			want: "data package path is required",
		},
		{
			name: "output path",
			req: StructuredRunRequest{
				PromptID:        "weather.hourly_generated_text",
				DataPackagePath: "/tmp/hourly.data_package.yaml",
			},
			want: "output path is required",
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			commands := &fakeCommands{}
			runner := Runner{Commands: commands}
			result, err := runner.StructuredRun(context.Background(), test.req)
			if err == nil {
				t.Fatal("StructuredRun() error = nil, want validation error")
			}
			if result != nil {
				t.Fatalf("StructuredRun() result = %#v, want nil", result)
			}
			if !strings.Contains(err.Error(), test.want) {
				t.Fatalf("StructuredRun() error = %v, want %q", err, test.want)
			}
			if commands.calls != 0 {
				t.Fatalf("commands calls = %d, want no subprocess execution", commands.calls)
			}
		})
	}
}

type fakeCommands struct {
	name    string
	args    []string
	timeout time.Duration
	result  CommandResult
	err     error
	calls   int
}

func (f *fakeCommands) Run(_ context.Context, name string, args []string, timeout time.Duration) (CommandResult, error) {
	f.calls++
	f.name = name
	f.args = append([]string{}, args...)
	f.timeout = timeout
	return f.result, f.err
}

func containsArg(args []string, want string) bool {
	for _, arg := range args {
		if arg == want {
			return true
		}
	}
	return false
}