package space.anyi.controller;

import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.media.Content;
import io.swagger.v3.oas.annotations.media.ExampleObject;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import io.swagger.v3.oas.annotations.responses.ApiResponses;
import io.swagger.v3.oas.annotations.tags.Tag;
import io.swagger.v3.oas.annotations.parameters.RequestBody;
import jakarta.validation.Valid;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import space.anyi.common.Result;
import space.anyi.dto.UserRequest;
import space.anyi.entity.User;
import space.anyi.service.UserService;
import space.anyi.vo.UserVO;

import java.util.List;

@RestController
@RequestMapping("/api/users")
@Tag(name = "User Management", description = "Endpoints for managing users")
public class UserController {

    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping
    @Operation(summary = "List all users", description = "Returns the full list of users stored in the system.")
    @ApiResponses({
@ApiResponse(responseCode = "200", description = "A list of users"),
                    @ApiResponse(responseCode = "500", description = "Internal server error")
    })
    public Result<List<UserVO>> findAll() {
        List<UserVO> users = userService.findAll().stream().map(UserVO::from).toList();
        return Result.success(users);
    }

    @GetMapping("/{id}")
    @Operation(summary = "Get a user by id", description = "Returns a single user matching the given id.")
    @ApiResponses({
            @ApiResponse(responseCode = "200", description = "The requested user"),
            @ApiResponse(responseCode = "404", description = "User not found")
    })
    public Result<UserVO> findById(
            @Parameter(description = "Id of the user to retrieve", example = "1")
            @PathVariable Long id) {
        return Result.success(UserVO.from(userService.findById(id)));
    }

    @PostMapping
    @Operation(summary = "Create a user", description = "Creates a new user. The account must be unique.")
    @ApiResponses({
            @ApiResponse(responseCode = "200", description = "User created"),
            @ApiResponse(responseCode = "400", description = "Invalid request body"),
            @ApiResponse(responseCode = "409", description = "Account already exists")
    })
    public Result<UserVO> create(
            @RequestBody(description = "User data to create", required = true,
                    content = @Content(schema = @Schema(implementation = UserRequest.class),
                            examples = @ExampleObject(name = "user", value = """
                                    {
                                      "name": "Alice",
                                      "account": "alice01",
                                      "sex": "female"
                                    }
                                    """)))
            @org.springframework.web.bind.annotation.RequestBody @Valid UserRequest request) {
        return Result.success(UserVO.from(userService.create(toEntity(request))));
    }

    @PutMapping("/{id}")
    @Operation(summary = "Update a user", description = "Updates an existing user by id. The account must be unique.")
    @ApiResponses({
            @ApiResponse(responseCode = "200", description = "User updated"),
            @ApiResponse(responseCode = "400", description = "Invalid request body"),
            @ApiResponse(responseCode = "404", description = "User not found"),
            @ApiResponse(responseCode = "409", description = "Account already exists")
    })
    public Result<UserVO> update(
            @Parameter(description = "Id of the user to update", example = "1")
            @PathVariable Long id,
            @RequestBody(description = "Updated user data", required = true,
                    content = @Content(schema = @Schema(implementation = UserRequest.class),
                            examples = @ExampleObject(name = "user", value = """
                                    {
                                      "name": "Alice",
                                      "account": "alice_new",
                                      "sex": "female"
                                    }
                                    """)))
            @org.springframework.web.bind.annotation.RequestBody @Valid UserRequest request) {
        return Result.success(UserVO.from(userService.update(id, toEntity(request))));
    }

    @DeleteMapping("/{id}")
    @Operation(summary = "Delete a user", description = "Deletes the user matching the given id.")
    @ApiResponses({
            @ApiResponse(responseCode = "200", description = "User deleted"),
            @ApiResponse(responseCode = "404", description = "User not found")
    })
    public Result<Void> delete(
            @Parameter(description = "Id of the user to delete", example = "1")
            @PathVariable Long id) {
        userService.delete(id);
        return Result.success();
    }

    private User toEntity(UserRequest request) {
        return new User(request.getName(), request.getAccount(), request.getSex());
    }
}